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qzdoom/src/scripting/codegeneration/codegen.cpp
Christoph Oelckers 7688e14bec - added a boolean cast VM instruction. 
Although this already helps a lot with the messed up code generated for comparisons it's not really a solution for this - it still needs a proper implementation to generate efficient code.
2016-12-01 01:13:53 +01:00

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/*
** thingdef_expression.cpp
**
** Expression evaluation
**
**---------------------------------------------------------------------------
** Copyright 2008 Christoph Oelckers
** All rights reserved.
**
** Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions
** are met:
**
** 1. Redistributions of source code must retain the above copyright
** notice, this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright
** notice, this list of conditions and the following disclaimer in the
** documentation and/or other materials provided with the distribution.
** 3. The name of the author may not be used to endorse or promote products
** derived from this software without specific prior written permission.
** 4. When not used as part of ZDoom or a ZDoom derivative, this code will be
** covered by the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or (at
** your option) any later version.
**
** THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
** OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
** IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
** INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
** NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
** THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**---------------------------------------------------------------------------
**
*/
#include <stdlib.h>
#include "actor.h"
#include "sc_man.h"
#include "tarray.h"
#include "templates.h"
#include "cmdlib.h"
#include "i_system.h"
#include "m_random.h"
#include "a_pickups.h"
#include "thingdef.h"
#include "p_lnspec.h"
#include "doomstat.h"
#include "codegen.h"
#include "m_fixed.h"
#include "vmbuilder.h"
#include "v_text.h"
#include "w_wad.h"
#include "math/cmath.h"
extern FRandom pr_exrandom;
FMemArena FxAlloc(65536);
struct FLOP
{
ENamedName Name;
int Flop;
double (*Evaluate)(double);
};
// Decorate operates on degrees, so the evaluate functions need to convert
// degrees to radians for those that work with angles.
static const FLOP FxFlops[] =
{
{ NAME_Exp, FLOP_EXP, [](double v) { return g_exp(v); } },
{ NAME_Log, FLOP_LOG, [](double v) { return g_log(v); } },
{ NAME_Log10, FLOP_LOG10, [](double v) { return g_log10(v); } },
{ NAME_Sqrt, FLOP_SQRT, [](double v) { return g_sqrt(v); } },
{ NAME_Ceil, FLOP_CEIL, [](double v) { return ceil(v); } },
{ NAME_Floor, FLOP_FLOOR, [](double v) { return floor(v); } },
{ NAME_ACos, FLOP_ACOS_DEG, [](double v) { return g_acos(v) * (180.0 / M_PI); } },
{ NAME_ASin, FLOP_ASIN_DEG, [](double v) { return g_asin(v) * (180.0 / M_PI); } },
{ NAME_ATan, FLOP_ATAN_DEG, [](double v) { return g_atan(v) * (180.0 / M_PI); } },
{ NAME_Cos, FLOP_COS_DEG, [](double v) { return g_cosdeg(v); } },
{ NAME_Sin, FLOP_SIN_DEG, [](double v) { return g_sindeg(v); } },
{ NAME_Tan, FLOP_TAN_DEG, [](double v) { return g_tan(v * (M_PI / 180.0)); } },
{ NAME_CosH, FLOP_COSH, [](double v) { return g_cosh(v); } },
{ NAME_SinH, FLOP_SINH, [](double v) { return g_sinh(v); } },
{ NAME_TanH, FLOP_TANH, [](double v) { return g_tanh(v); } },
};
//==========================================================================
//
// FCompileContext
//
//==========================================================================
FCompileContext::FCompileContext(PFunction *fnc, PPrototype *ret, bool fromdecorate, int stateindex, int statecount, int lump)
: ReturnProto(ret), Function(fnc), Class(nullptr), FromDecorate(fromdecorate), StateIndex(stateindex), StateCount(statecount), Lump(lump)
{
if (fnc != nullptr) Class = fnc->OwningClass;
}
FCompileContext::FCompileContext(PStruct *cls, bool fromdecorate)
: ReturnProto(nullptr), Function(nullptr), Class(cls), FromDecorate(fromdecorate), StateIndex(-1), StateCount(0), Lump(-1)
{
}
PSymbol *FCompileContext::FindInClass(FName identifier, PSymbolTable *&symt)
{
return Class != nullptr? Class->Symbols.FindSymbolInTable(identifier, symt) : nullptr;
}
PSymbol *FCompileContext::FindInSelfClass(FName identifier, PSymbolTable *&symt)
{
// If we have no self we cannot retrieve any values from it.
if (Function == nullptr || Function->Variants[0].SelfClass == nullptr) return nullptr;
return Function->Variants[0].SelfClass->Symbols.FindSymbolInTable(identifier, symt);
}
PSymbol *FCompileContext::FindGlobal(FName identifier)
{
return GlobalSymbols.FindSymbol(identifier, true);
}
void FCompileContext::CheckReturn(PPrototype *proto, FScriptPosition &pos)
{
assert(proto != nullptr);
bool fail = false;
if (ReturnProto == nullptr)
{
ReturnProto = proto;
return;
}
// A prototype that defines fewer return types can be compatible with
// one that defines more if the shorter one matches the initial types
// for the longer one.
if (ReturnProto->ReturnTypes.Size() < proto->ReturnTypes.Size())
{ // Make proto the shorter one to avoid code duplication below.
swapvalues(proto, ReturnProto);
}
// If one prototype returns nothing, they both must.
if (proto->ReturnTypes.Size() == 0)
{
if (ReturnProto->ReturnTypes.Size() != 0)
{
fail = true;
}
}
else
{
for (unsigned i = 0; i < proto->ReturnTypes.Size(); i++)
{
if (ReturnProto->ReturnTypes[i] != proto->ReturnTypes[i])
{ // Incompatible
fail = true;
break;
}
}
}
if (fail)
{
pos.Message(MSG_ERROR, "Return type mismatch");
}
}
bool FCompileContext::CheckReadOnly(int flags)
{
if (!(flags & VARF_ReadOnly)) return false;
if (!(flags & VARF_InternalAccess)) return true;
return Wads.GetLumpFile(Lump) != 0;
}
FxLocalVariableDeclaration *FCompileContext::FindLocalVariable(FName name)
{
if (Block == nullptr)
{
return nullptr;
}
else
{
return Block->FindLocalVariable(name, *this);
}
}
static PStruct *FindStructType(FName name)
{
PStruct *ccls = PClass::FindClass(name);
if (ccls == nullptr)
{
ccls = dyn_cast<PStruct>(TypeTable.FindType(RUNTIME_CLASS(PStruct), 0, (intptr_t)name, nullptr));
if (ccls == nullptr) ccls = dyn_cast<PStruct>(TypeTable.FindType(RUNTIME_CLASS(PNativeStruct), 0, (intptr_t)name, nullptr));
}
return ccls;
}
//==========================================================================
//
// ExpEmit
//
//==========================================================================
ExpEmit::ExpEmit(VMFunctionBuilder *build, int type, int count)
: RegNum(build->Registers[type].Get(count)), RegType(type), RegCount(count), Konst(false), Fixed(false), Final(false), Target(false)
{
}
void ExpEmit::Free(VMFunctionBuilder *build)
{
if (!Fixed && !Konst && RegType <= REGT_TYPE)
{
build->Registers[RegType].Return(RegNum, RegCount);
}
}
void ExpEmit::Reuse(VMFunctionBuilder *build)
{
if (!Fixed && !Konst)
{
assert(RegCount == 1);
bool success = build->Registers[RegType].Reuse(RegNum);
assert(success && "Attempt to reuse a register that is already in use");
}
}
//==========================================================================
//
// FindBuiltinFunction
//
// Returns the symbol for a decorate utility function. If not found, create
// it and install it a local symbol table.
//
//==========================================================================
static PSymbol *FindBuiltinFunction(FName funcname, VMNativeFunction::NativeCallType func)
{
PSymbol *sym = GlobalSymbols.FindSymbol(funcname, false);
if (sym == nullptr)
{
PSymbolVMFunction *symfunc = new PSymbolVMFunction(funcname);
VMNativeFunction *calldec = new VMNativeFunction(func, funcname);
calldec->PrintableName = funcname.GetChars();
symfunc->Function = calldec;
sym = symfunc;
GlobalSymbols.AddSymbol(sym);
}
return sym;
}
//==========================================================================
//
//
//
//==========================================================================
static bool AreCompatiblePointerTypes(PType *dest, PType *source, bool forcompare = false)
{
if (dest->IsKindOf(RUNTIME_CLASS(PPointer)) && source->IsKindOf(RUNTIME_CLASS(PPointer)))
{
// Pointers to different types are only compatible if both point to an object and the source type is a child of the destination type.
auto fromtype = static_cast<PPointer *>(source);
auto totype = static_cast<PPointer *>(dest);
if (fromtype == nullptr) return true;
if (!forcompare && totype->IsConst != fromtype->IsConst) return false;
if (fromtype == totype) return true;
if (fromtype->PointedType->IsKindOf(RUNTIME_CLASS(PClass)) && totype->PointedType->IsKindOf(RUNTIME_CLASS(PClass)))
{
auto fromcls = static_cast<PClass *>(fromtype->PointedType);
auto tocls = static_cast<PClass *>(totype->PointedType);
if (forcompare && tocls->IsDescendantOf(fromcls)) return true;
return (fromcls->IsDescendantOf(tocls));
}
}
return false;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxExpression::Emit (VMFunctionBuilder *build)
{
ScriptPosition.Message(MSG_ERROR, "Unemitted expression found");
return ExpEmit();
}
//==========================================================================
//
//
//
//==========================================================================
bool FxExpression::isConstant() const
{
return false;
}
//==========================================================================
//
//
//
//==========================================================================
VMFunction *FxExpression::GetDirectFunction()
{
return nullptr;
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxExpression::Resolve(FCompileContext &ctx)
{
isresolved = true;
return this;
}
//==========================================================================
//
// Returns true if we can write to the address.
//
//==========================================================================
bool FxExpression::RequestAddress(FCompileContext &ctx, bool *writable)
{
if (writable != nullptr) *writable = false;
return false;
}
//==========================================================================
//
// Called by return statements.
//
//==========================================================================
PPrototype *FxExpression::ReturnProto()
{
assert(ValueType != nullptr);
TArray<PType *> ret(0);
TArray<PType *> none(0);
if (ValueType != TypeVoid)
{
ret.Push(ValueType);
}
return NewPrototype(ret, none);
}
//==========================================================================
//
//
//
//==========================================================================
static int EncodeRegType(ExpEmit reg)
{
int regtype = reg.RegType;
if (reg.Konst)
{
regtype |= REGT_KONST;
}
else if (reg.RegCount == 2)
{
regtype |= REGT_MULTIREG2;
}
else if (reg.RegCount == 3)
{
regtype |= REGT_MULTIREG3;
}
return regtype;
}
//==========================================================================
//
//
//
//==========================================================================
static int EmitParameter(VMFunctionBuilder *build, FxExpression *operand, const FScriptPosition &pos)
{
ExpEmit where = operand->Emit(build);
if (where.RegType == REGT_NIL)
{
pos.Message(MSG_ERROR, "Attempted to pass a non-value");
build->Emit(OP_PARAM, 0, where.RegType, where.RegNum);
return 1;
}
else
{
build->Emit(OP_PARAM, 0, EncodeRegType(where), where.RegNum);
where.Free(build);
return where.RegCount;
}
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxConstant::MakeConstant(PSymbol *sym, const FScriptPosition &pos)
{
FxExpression *x;
PSymbolConstNumeric *csym = dyn_cast<PSymbolConstNumeric>(sym);
if (csym != nullptr)
{
if (csym->ValueType->IsA(RUNTIME_CLASS(PInt)))
{
x = new FxConstant(csym->Value, pos);
}
else if (csym->ValueType->IsA(RUNTIME_CLASS(PFloat)))
{
x = new FxConstant(csym->Float, pos);
}
else
{
pos.Message(MSG_ERROR, "Invalid constant '%s'\n", csym->SymbolName.GetChars());
return nullptr;
}
}
else
{
pos.Message(MSG_ERROR, "'%s' is not a constant\n", sym->SymbolName.GetChars());
x = nullptr;
}
return x;
}
ExpEmit FxConstant::Emit(VMFunctionBuilder *build)
{
ExpEmit out;
out.Konst = true;
int regtype = value.Type->GetRegType();
out.RegType = regtype;
if (regtype == REGT_INT)
{
out.RegNum = build->GetConstantInt(value.Int);
}
else if (regtype == REGT_FLOAT)
{
out.RegNum = build->GetConstantFloat(value.Float);
}
else if (regtype == REGT_POINTER)
{
VM_ATAG tag = ATAG_GENERIC;
if (value.Type == TypeState)
{
tag = ATAG_STATE;
}
else if (value.Type->GetLoadOp() == OP_LO)
{
tag = ATAG_OBJECT;
}
out.RegNum = build->GetConstantAddress(value.pointer, tag);
}
else if (regtype == REGT_STRING)
{
out.RegNum = build->GetConstantString(value.GetString());
}
else
{
ScriptPosition.Message(MSG_ERROR, "Cannot emit needed constant");
out.RegNum = 0;
}
return out;
}
//==========================================================================
//
//
//
//==========================================================================
FxVectorValue::FxVectorValue(FxExpression *x, FxExpression *y, FxExpression *z, const FScriptPosition &sc)
:FxExpression(EFX_VectorValue, sc)
{
xyz[0] = x;
xyz[1] = y;
xyz[2] = z;
isConst = false;
ValueType = TypeVoid; // we do not know yet
}
FxVectorValue::~FxVectorValue()
{
for (auto &a : xyz)
{
SAFE_DELETE(a);
}
}
FxExpression *FxVectorValue::Resolve(FCompileContext&ctx)
{
bool fails = false;
for (auto &a : xyz)
{
if (a != nullptr)
{
a = a->Resolve(ctx);
if (a == nullptr) fails = true;
else
{
if (a->ValueType != TypeVector2) // a vec3 may be initialized with (vec2, z)
{
a = new FxFloatCast(a);
a = a->Resolve(ctx);
fails |= (a == nullptr);
}
}
}
}
if (fails)
{
delete this;
return nullptr;
}
// at this point there are three legal cases:
// * two floats = vector2
// * three floats = vector3
// * vector2 + float = vector3
if (xyz[0]->ValueType == TypeVector2)
{
if (xyz[1]->ValueType != TypeFloat64 || xyz[2] != nullptr)
{
ScriptPosition.Message(MSG_ERROR, "Not a valid vector");
delete this;
return nullptr;
}
ValueType = TypeVector3;
if (xyz[0]->ExprType == EFX_VectorValue)
{
// If two vector initializers are nested, unnest them now.
auto vi = static_cast<FxVectorValue*>(xyz[0]);
xyz[2] = xyz[1];
xyz[1] = vi->xyz[1];
xyz[0] = vi->xyz[0];
vi->xyz[0] = vi->xyz[1] = nullptr; // Don't delete our own expressions.
delete vi;
}
}
else if (xyz[0]->ValueType == TypeFloat64 && xyz[1]->ValueType == TypeFloat64)
{
ValueType = xyz[2] == nullptr ? TypeVector2 : TypeVector3;
}
else
{
ScriptPosition.Message(MSG_ERROR, "Not a valid vector");
delete this;
return nullptr;
}
// check if all elements are constant. If so this can be emitted as a constant vector.
isConst = true;
for (auto &a : xyz)
{
if (a != nullptr && !a->isConstant()) isConst = false;
}
return this;
}
static ExpEmit EmitKonst(VMFunctionBuilder *build, ExpEmit &emit)
{
if (emit.Konst)
{
ExpEmit out(build, REGT_FLOAT);
build->Emit(OP_LKF, out.RegNum, emit.RegNum);
return out;
}
return emit;
}
ExpEmit FxVectorValue::Emit(VMFunctionBuilder *build)
{
// no const handling here. Ultimstely it's too rarely used (i.e. the only fully constant vector ever allocated in ZDoom is the 0-vector in a very few places)
// and the negatives (excessive allocation of float constants) outweigh the positives (saved a few instructions)
assert(xyz[0] != nullptr);
assert(xyz[1] != nullptr);
if (ValueType == TypeVector2)
{
ExpEmit tempxval = xyz[0]->Emit(build);
ExpEmit tempyval = xyz[1]->Emit(build);
ExpEmit xval = EmitKonst(build, tempxval);
ExpEmit yval = EmitKonst(build, tempyval);
assert(xval.RegType == REGT_FLOAT && yval.RegType == REGT_FLOAT);
if (yval.RegNum == xval.RegNum + 1)
{
// The results are already in two continuous registers so just return them as-is.
xval.RegCount++;
return xval;
}
else
{
// The values are not in continuous registers so they need to be copied together now.
ExpEmit out(build, REGT_FLOAT, 2);
build->Emit(OP_MOVEF, out.RegNum, xval.RegNum);
build->Emit(OP_MOVEF, out.RegNum + 1, yval.RegNum);
xval.Free(build);
yval.Free(build);
return out;
}
}
else if (xyz[0]->ValueType == TypeVector2) // vec2+float
{
ExpEmit xyval = xyz[0]->Emit(build);
ExpEmit tempzval = xyz[1]->Emit(build);
ExpEmit zval = EmitKonst(build, tempzval);
assert(xyval.RegType == REGT_FLOAT && xyval.RegCount == 2 && zval.RegType == REGT_FLOAT);
if (zval.RegNum == xyval.RegNum + 2)
{
// The results are already in three continuous registers so just return them as-is.
xyval.RegCount++;
return xyval;
}
else
{
// The values are not in continuous registers so they need to be copied together now.
ExpEmit out(build, REGT_FLOAT, 3);
build->Emit(OP_MOVEV2, out.RegNum, xyval.RegNum);
build->Emit(OP_MOVEF, out.RegNum + 2, zval.RegNum);
xyval.Free(build);
zval.Free(build);
return out;
}
}
else // 3*float
{
assert(xyz[2] != nullptr);
ExpEmit tempxval = xyz[0]->Emit(build);
ExpEmit tempyval = xyz[1]->Emit(build);
ExpEmit tempzval = xyz[2]->Emit(build);
ExpEmit xval = EmitKonst(build, tempxval);
ExpEmit yval = EmitKonst(build, tempyval);
ExpEmit zval = EmitKonst(build, tempzval);
assert(xval.RegType == REGT_FLOAT && yval.RegType == REGT_FLOAT && zval.RegType == REGT_FLOAT);
if (yval.RegNum == xval.RegNum + 1 && zval.RegNum == xval.RegNum + 2)
{
// The results are already in three continuous registers so just return them as-is.
xval.RegCount += 2;
return xval;
}
else
{
// The values are not in continuous registers so they need to be copied together now.
ExpEmit out(build, REGT_FLOAT, 3);
//Try to optimize a bit...
if (yval.RegNum == xval.RegNum + 1)
{
build->Emit(OP_MOVEV2, out.RegNum, xval.RegNum);
build->Emit(OP_MOVEF, out.RegNum + 2, zval.RegNum);
}
else if (zval.RegNum == yval.RegNum + 1)
{
build->Emit(OP_MOVEF, out.RegNum, xval.RegNum);
build->Emit(OP_MOVEV2, out.RegNum+1, yval.RegNum);
}
else
{
build->Emit(OP_MOVEF, out.RegNum, xval.RegNum);
build->Emit(OP_MOVEF, out.RegNum + 1, yval.RegNum);
build->Emit(OP_MOVEF, out.RegNum + 2, zval.RegNum);
}
xval.Free(build);
yval.Free(build);
zval.Free(build);
return out;
}
}
}
//==========================================================================
//
//
//
//==========================================================================
FxBoolCast::FxBoolCast(FxExpression *x, bool needvalue)
: FxExpression(EFX_BoolCast, x->ScriptPosition)
{
basex = x;
ValueType = TypeBool;
NeedValue = needvalue;
}
//==========================================================================
//
//
//
//==========================================================================
FxBoolCast::~FxBoolCast()
{
SAFE_DELETE(basex);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxBoolCast::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(basex, ctx);
if (basex->ValueType == TypeBool)
{
FxExpression *x = basex;
basex = nullptr;
delete this;
return x;
}
else if (basex->IsBoolCompat())
{
if (basex->isConstant())
{
assert(basex->ValueType != TypeState && "We shouldn't be able to generate a constant state ref");
ExpVal constval = static_cast<FxConstant *>(basex)->GetValue();
FxExpression *x = new FxConstant(constval.GetBool(), ScriptPosition);
delete this;
return x;
}
return this;
}
ScriptPosition.Message(MSG_ERROR, "Numeric type expected");
delete this;
return nullptr;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxBoolCast::Emit(VMFunctionBuilder *build)
{
ExpEmit from = basex->Emit(build);
assert(!from.Konst);
assert(basex->ValueType->GetRegType() == REGT_INT || basex->ValueType->GetRegType() == REGT_FLOAT || basex->ValueType->GetRegType() == REGT_POINTER);
if (NeedValue)
{
ExpEmit to(build, REGT_INT);
from.Free(build);
// Preload result with 0.
build->Emit(OP_CASTB, to.RegNum, from.RegNum, from.RegType == REGT_INT ? CASTB_I : from.RegType == REGT_FLOAT ? CASTB_F : CASTB_A);
return to;
}
else
{
return from;
}
}
//==========================================================================
//
//
//
//==========================================================================
FxIntCast::FxIntCast(FxExpression *x, bool nowarn, bool explicitly)
: FxExpression(EFX_IntCast, x->ScriptPosition)
{
basex=x;
ValueType = TypeSInt32;
NoWarn = nowarn;
Explicit = explicitly;
}
//==========================================================================
//
//
//
//==========================================================================
FxIntCast::~FxIntCast()
{
SAFE_DELETE(basex);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxIntCast::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(basex, ctx);
if (basex->ValueType->GetRegType() == REGT_INT)
{
if (basex->ValueType->isNumeric() || Explicit) // names can be converted to int, but only with an explicit type cast.
{
FxExpression *x = basex;
x->ValueType = ValueType;
basex = nullptr;
delete this;
return x;
}
else
{
// Ugh. This should abort, but too many mods fell into this logic hole somewhere, so this serious error needs to be reduced to a warning. :(
// At least in ZScript, MSG_OPTERROR always means to report an error, not a warning so the problem only exists in DECORATE.
if (!basex->isConstant())
ScriptPosition.Message(MSG_OPTERROR, "Numeric type expected, got a name");
else ScriptPosition.Message(MSG_OPTERROR, "Numeric type expected, got \"%s\"", static_cast<FxConstant*>(basex)->GetValue().GetName().GetChars());
FxExpression * x = new FxConstant(0, ScriptPosition);
delete this;
return x;
}
}
else if (basex->IsFloat())
{
if (basex->isConstant())
{
ExpVal constval = static_cast<FxConstant *>(basex)->GetValue();
FxExpression *x = new FxConstant(constval.GetInt(), ScriptPosition);
if (constval.GetInt() != constval.GetFloat())
{
ScriptPosition.Message(MSG_WARNING, "Truncation of floating point constant %f", constval.GetFloat());
}
delete this;
return x;
}
else if (!NoWarn)
{
ScriptPosition.Message(MSG_DEBUGWARN, "Truncation of floating point value");
}
return this;
}
ScriptPosition.Message(MSG_ERROR, "Numeric type expected");
delete this;
return nullptr;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxIntCast::Emit(VMFunctionBuilder *build)
{
ExpEmit from = basex->Emit(build);
assert(!from.Konst);
assert(basex->ValueType->GetRegType() == REGT_FLOAT);
from.Free(build);
ExpEmit to(build, REGT_INT);
build->Emit(OP_CAST, to.RegNum, from.RegNum, ValueType == TypeUInt32? CAST_F2U : CAST_F2I);
return to;
}
//==========================================================================
//
//
//
//==========================================================================
FxFloatCast::FxFloatCast(FxExpression *x)
: FxExpression(EFX_FloatCast, x->ScriptPosition)
{
basex = x;
ValueType = TypeFloat64;
}
//==========================================================================
//
//
//
//==========================================================================
FxFloatCast::~FxFloatCast()
{
SAFE_DELETE(basex);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxFloatCast::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(basex, ctx);
if (basex->IsFloat())
{
FxExpression *x = basex;
basex = nullptr;
delete this;
return x;
}
else if (basex->ValueType->GetRegType() == REGT_INT)
{
if (basex->ValueType->isNumeric())
{
if (basex->isConstant())
{
ExpVal constval = static_cast<FxConstant *>(basex)->GetValue();
FxExpression *x = new FxConstant(constval.GetFloat(), ScriptPosition);
delete this;
return x;
}
return this;
}
else
{
// Ugh. This should abort, but too many mods fell into this logic hole somewhere, so this seroious error needs to be reduced to a warning. :(
// At least in ZScript, MSG_OPTERROR always means to report an error, not a warning so the problem only exists in DECORATE.
if (!basex->isConstant()) ScriptPosition.Message(MSG_OPTERROR, "Numeric type expected, got a name");
else ScriptPosition.Message(MSG_OPTERROR, "Numeric type expected, got \"%s\"", static_cast<FxConstant*>(basex)->GetValue().GetName().GetChars());
FxExpression *x = new FxConstant(0.0, ScriptPosition);
delete this;
return x;
}
}
else
{
ScriptPosition.Message(MSG_ERROR, "Numeric type expected");
delete this;
return nullptr;
}
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxFloatCast::Emit(VMFunctionBuilder *build)
{
ExpEmit from = basex->Emit(build);
assert(!from.Konst);
assert(basex->ValueType->GetRegType() == REGT_INT);
from.Free(build);
ExpEmit to(build, REGT_FLOAT);
build->Emit(OP_CAST, to.RegNum, from.RegNum, basex->ValueType == TypeUInt32? CAST_U2F : CAST_I2F);
return to;
}
//==========================================================================
//
//
//
//==========================================================================
FxNameCast::FxNameCast(FxExpression *x)
: FxExpression(EFX_NameCast, x->ScriptPosition)
{
basex = x;
ValueType = TypeName;
}
//==========================================================================
//
//
//
//==========================================================================
FxNameCast::~FxNameCast()
{
SAFE_DELETE(basex);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxNameCast::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(basex, ctx);
if (basex->ValueType == TypeName)
{
FxExpression *x = basex;
basex = nullptr;
delete this;
return x;
}
else if (basex->ValueType == TypeString)
{
if (basex->isConstant())
{
ExpVal constval = static_cast<FxConstant *>(basex)->GetValue();
FxExpression *x = new FxConstant(constval.GetName(), ScriptPosition);
delete this;
return x;
}
return this;
}
else
{
ScriptPosition.Message(MSG_ERROR, "Cannot convert to name");
delete this;
return nullptr;
}
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxNameCast::Emit(VMFunctionBuilder *build)
{
ExpEmit from = basex->Emit(build);
assert(!from.Konst);
assert(basex->ValueType == TypeString);
from.Free(build);
ExpEmit to(build, REGT_INT);
build->Emit(OP_CAST, to.RegNum, from.RegNum, CAST_S2N);
return to;
}
//==========================================================================
//
//
//
//==========================================================================
FxStringCast::FxStringCast(FxExpression *x)
: FxExpression(EFX_StringCast, x->ScriptPosition)
{
basex = x;
ValueType = TypeString;
}
//==========================================================================
//
//
//
//==========================================================================
FxStringCast::~FxStringCast()
{
SAFE_DELETE(basex);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxStringCast::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(basex, ctx);
if (basex->ValueType == TypeString)
{
FxExpression *x = basex;
basex = nullptr;
delete this;
return x;
}
else if (basex->ValueType == TypeName)
{
if (basex->isConstant())
{
ExpVal constval = static_cast<FxConstant *>(basex)->GetValue();
FxExpression *x = new FxConstant(constval.GetString(), ScriptPosition);
delete this;
return x;
}
return this;
}
else if (basex->ValueType == TypeSound)
{
if (basex->isConstant())
{
ExpVal constval = static_cast<FxConstant *>(basex)->GetValue();
FxExpression *x = new FxConstant(S_sfx[constval.GetInt()].name, ScriptPosition);
delete this;
return x;
}
return this;
}
// although it could be done, let's not convert colors back to strings.
else
{
ScriptPosition.Message(MSG_ERROR, "Cannot convert to string");
delete this;
return nullptr;
}
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxStringCast::Emit(VMFunctionBuilder *build)
{
ExpEmit from = basex->Emit(build);
assert(!from.Konst);
from.Free(build);
ExpEmit to(build, REGT_STRING);
if (basex->ValueType == TypeName)
{
build->Emit(OP_CAST, to.RegNum, from.RegNum, CAST_N2S);
}
else if (basex->ValueType == TypeSound)
{
build->Emit(OP_CAST, to.RegNum, from.RegNum, CAST_So2S);
}
return to;
}
//==========================================================================
//
//
//
//==========================================================================
FxColorCast::FxColorCast(FxExpression *x)
: FxExpression(EFX_ColorCast, x->ScriptPosition)
{
basex = x;
ValueType = TypeColor;
}
//==========================================================================
//
//
//
//==========================================================================
FxColorCast::~FxColorCast()
{
SAFE_DELETE(basex);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxColorCast::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(basex, ctx);
if (basex->ValueType == TypeColor || basex->ValueType->GetClass() == RUNTIME_CLASS(PInt))
{
FxExpression *x = basex;
x->ValueType = TypeColor;
basex = nullptr;
delete this;
return x;
}
else if (basex->ValueType == TypeString)
{
if (basex->isConstant())
{
ExpVal constval = static_cast<FxConstant *>(basex)->GetValue();
if (constval.GetString().Len() == 0)
{
// empty string means 'no state'. This would otherwise just cause endless errors and have the same result anyway.
FxExpression *x = new FxConstant(-1, ScriptPosition);
delete this;
return x;
}
else
{
FxExpression *x = new FxConstant(V_GetColor(nullptr, constval.GetString()), ScriptPosition);
delete this;
return x;
}
}
return this;
}
else
{
ScriptPosition.Message(MSG_ERROR, "Cannot convert to color");
delete this;
return nullptr;
}
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxColorCast::Emit(VMFunctionBuilder *build)
{
ExpEmit from = basex->Emit(build);
assert(!from.Konst);
assert(basex->ValueType == TypeString);
from.Free(build);
ExpEmit to(build, REGT_INT);
build->Emit(OP_CAST, to.RegNum, from.RegNum, CAST_S2Co);
return to;
}
//==========================================================================
//
//
//
//==========================================================================
FxSoundCast::FxSoundCast(FxExpression *x)
: FxExpression(EFX_SoundCast, x->ScriptPosition)
{
basex = x;
ValueType = TypeSound;
}
//==========================================================================
//
//
//
//==========================================================================
FxSoundCast::~FxSoundCast()
{
SAFE_DELETE(basex);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxSoundCast::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(basex, ctx);
if (basex->ValueType == TypeSound || basex->ValueType->GetClass() == RUNTIME_CLASS(PInt))
{
FxExpression *x = basex;
x->ValueType = TypeSound;
basex = nullptr;
delete this;
return x;
}
else if (basex->ValueType == TypeString)
{
if (basex->isConstant())
{
ExpVal constval = static_cast<FxConstant *>(basex)->GetValue();
FxExpression *x = new FxConstant(FSoundID(constval.GetString()), ScriptPosition);
delete this;
return x;
}
return this;
}
else
{
ScriptPosition.Message(MSG_ERROR, "Cannot convert to sound");
delete this;
return nullptr;
}
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxSoundCast::Emit(VMFunctionBuilder *build)
{
ExpEmit from = basex->Emit(build);
assert(!from.Konst);
assert(basex->ValueType == TypeString);
from.Free(build);
ExpEmit to(build, REGT_INT);
build->Emit(OP_CAST, to.RegNum, from.RegNum, CAST_S2So);
return to;
}
//==========================================================================
//
// generic type cast operator
//
//==========================================================================
FxTypeCast::FxTypeCast(FxExpression *x, PType *type, bool nowarn, bool explicitly)
: FxExpression(EFX_TypeCast, x->ScriptPosition)
{
basex = x;
ValueType = type;
NoWarn = nowarn;
Explicit = explicitly;
assert(ValueType != nullptr);
}
//==========================================================================
//
//
//
//==========================================================================
FxTypeCast::~FxTypeCast()
{
SAFE_DELETE(basex);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxTypeCast::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(basex, ctx);
// first deal with the simple types
if (ValueType == TypeError || basex->ValueType == TypeError)
{
ScriptPosition.Message(MSG_ERROR, "Trying to cast to invalid type.");
delete this;
return nullptr;
}
else if (ValueType == TypeVoid) // this should never happen
{
goto errormsg;
}
else if (basex->ValueType == TypeVoid)
{
goto errormsg;
}
else if (basex->ValueType == ValueType)
{
// don't go through the entire list if the types are the same.
goto basereturn;
}
else if (basex->ValueType == TypeNullPtr && (ValueType == TypeState || ValueType->IsKindOf(RUNTIME_CLASS(PPointer))))
{
goto basereturn;
}
else if (IsFloat())
{
FxExpression *x = new FxFloatCast(basex);
x = x->Resolve(ctx);
basex = nullptr;
delete this;
return x;
}
else if (ValueType->IsA(RUNTIME_CLASS(PInt)))
{
// This is only for casting to actual ints. Subtypes representing an int will be handled elsewhere.
FxExpression *x = new FxIntCast(basex, NoWarn, Explicit);
x = x->Resolve(ctx);
basex = nullptr;
delete this;
return x;
}
else if (ValueType == TypeBool)
{
FxExpression *x = new FxBoolCast(basex);
x = x->Resolve(ctx);
basex = nullptr;
delete this;
return x;
}
else if (ValueType == TypeString)
{
FxExpression *x = new FxStringCast(basex);
x = x->Resolve(ctx);
basex = nullptr;
delete this;
return x;
}
else if (ValueType == TypeName)
{
FxExpression *x = new FxNameCast(basex);
x = x->Resolve(ctx);
basex = nullptr;
delete this;
return x;
}
else if (ValueType == TypeSound)
{
FxExpression *x = new FxSoundCast(basex);
x = x->Resolve(ctx);
basex = nullptr;
delete this;
return x;
}
else if (ValueType == TypeColor)
{
FxExpression *x = new FxColorCast(basex);
x = x->Resolve(ctx);
basex = nullptr;
delete this;
return x;
}
else if (ValueType == TypeSpriteID && basex->IsInteger())
{
basex->ValueType = TypeSpriteID;
auto x = basex;
basex = nullptr;
delete this;
return x;
}
else if (ValueType == TypeStateLabel)
{
if (basex->ValueType == TypeNullPtr)
{
auto x = new FxConstant(0, ScriptPosition);
x->ValueType = TypeStateLabel;
delete this;
return x;
}
// Right now this only supports string constants. There should be an option to pass a string variable, too.
if (basex->isConstant() && (basex->ValueType == TypeString || basex->ValueType == TypeName))
{
FString s= static_cast<FxConstant *>(basex)->GetValue().GetString();
if (s.Len() == 0 && !ctx.FromDecorate) // DECORATE should never get here at all, but let's better be safe.
{
ScriptPosition.Message(MSG_ERROR, "State jump to empty label.");
delete this;
return nullptr;
}
FxExpression *x = new FxMultiNameState(s, basex->ScriptPosition);
x = x->Resolve(ctx);
basex = nullptr;
delete this;
return x;
}
else if (basex->IsNumeric() && basex->ValueType != TypeSound && basex->ValueType != TypeColor)
{
if (ctx.StateIndex < 0)
{
ScriptPosition.Message(MSG_ERROR, "State jumps with index can only be used in anonymous state functions.");
delete this;
return nullptr;
}
if (ctx.StateCount != 1)
{
ScriptPosition.Message(MSG_ERROR, "State jumps with index cannot be used on multistate definitions");
delete this;
return nullptr;
}
if (basex->isConstant())
{
int i = static_cast<FxConstant *>(basex)->GetValue().GetInt();
if (i <= 0)
{
ScriptPosition.Message(MSG_ERROR, "State index must be positive");
delete this;
return nullptr;
}
FxExpression *x = new FxStateByIndex(ctx.StateIndex + i, ScriptPosition);
x = x->Resolve(ctx);
basex = nullptr;
delete this;
return x;
}
else
{
FxExpression *x = new FxRuntimeStateIndex(basex);
x = x->Resolve(ctx);
basex = nullptr;
delete this;
return x;
}
}
}
else if (ValueType->IsKindOf(RUNTIME_CLASS(PClassPointer)))
{
FxExpression *x = new FxClassTypeCast(static_cast<PClassPointer*>(ValueType), basex);
x = x->Resolve(ctx);
basex = nullptr;
delete this;
return x;
}
/* else if (ValueType->IsKindOf(RUNTIME_CLASS(PEnum)))
{
// this is not yet ready and does not get assigned to actual values.
}
*/
else if (ValueType->IsKindOf(RUNTIME_CLASS(PClass))) // this should never happen because the VM doesn't handle plain class types - just pointers
{
if (basex->ValueType->IsKindOf(RUNTIME_CLASS(PClass)))
{
// class types are only compatible if the base type is a descendant of the result type.
auto fromtype = static_cast<PClass *>(basex->ValueType);
auto totype = static_cast<PClass *>(ValueType);
if (fromtype->IsDescendantOf(totype)) goto basereturn;
}
}
else if (AreCompatiblePointerTypes(ValueType, basex->ValueType))
{
goto basereturn;
}
// todo: pointers to class objects.
// All other types are only compatible to themselves and have already been handled above by the equality check.
// Anything that falls through here is not compatible and must print an error.
errormsg:
ScriptPosition.Message(MSG_ERROR, "Cannot convert %s to %s", basex->ValueType->DescriptiveName(), ValueType->DescriptiveName());
delete this;
return nullptr;
basereturn:
auto x = basex;
x->ValueType = ValueType;
basex = nullptr;
delete this;
return x;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxTypeCast::Emit(VMFunctionBuilder *build)
{
assert(false);
// This should never be reached
return ExpEmit();
}
//==========================================================================
//
//
//
//==========================================================================
FxPlusSign::FxPlusSign(FxExpression *operand)
: FxExpression(EFX_PlusSign, operand->ScriptPosition)
{
Operand=operand;
}
//==========================================================================
//
//
//
//==========================================================================
FxPlusSign::~FxPlusSign()
{
SAFE_DELETE(Operand);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxPlusSign::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(Operand, ctx);
if (Operand->IsNumeric() || Operand->IsVector())
{
FxExpression *e = Operand;
Operand = nullptr;
delete this;
return e;
}
else
{
ScriptPosition.Message(MSG_ERROR, "Numeric type expected");
delete this;
return nullptr;
}
}
ExpEmit FxPlusSign::Emit(VMFunctionBuilder *build)
{
return Operand->Emit(build);
}
//==========================================================================
//
//
//
//==========================================================================
FxMinusSign::FxMinusSign(FxExpression *operand)
: FxExpression(EFX_MinusSign, operand->ScriptPosition)
{
Operand=operand;
}
//==========================================================================
//
//
//
//==========================================================================
FxMinusSign::~FxMinusSign()
{
SAFE_DELETE(Operand);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxMinusSign::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(Operand, ctx);
if (Operand->IsNumeric() || Operand->IsVector())
{
if (Operand->isConstant())
{
ExpVal val = static_cast<FxConstant *>(Operand)->GetValue();
FxExpression *e = val.Type->GetRegType() == REGT_INT ?
new FxConstant(-val.Int, ScriptPosition) :
new FxConstant(-val.Float, ScriptPosition);
delete this;
return e;
}
ValueType = Operand->ValueType;
return this;
}
else
{
ScriptPosition.Message(MSG_ERROR, "Numeric type expected");
delete this;
return nullptr;
}
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxMinusSign::Emit(VMFunctionBuilder *build)
{
assert(ValueType == Operand->ValueType);
ExpEmit from = Operand->Emit(build);
ExpEmit to;
assert(from.Konst == 0);
assert(ValueType->GetRegCount() == from.RegCount);
// Do it in-place, unless a local variable
if (from.Fixed)
{
to = ExpEmit(build, from.RegType, from.RegCount);
from.Free(build);
}
else
{
to = from;
}
if (ValueType->GetRegType() == REGT_INT)
{
build->Emit(OP_NEG, to.RegNum, from.RegNum, 0);
}
else
{
assert(ValueType->GetRegType() == REGT_FLOAT);
switch (from.RegCount)
{
case 1:
build->Emit(OP_FLOP, to.RegNum, from.RegNum, FLOP_NEG);
break;
case 2:
build->Emit(OP_NEGV2, to.RegNum, from.RegNum);
break;
case 3:
build->Emit(OP_NEGV3, to.RegNum, from.RegNum);
break;
}
}
return to;
}
//==========================================================================
//
//
//
//==========================================================================
FxUnaryNotBitwise::FxUnaryNotBitwise(FxExpression *operand)
: FxExpression(EFX_UnaryNotBitwise, operand->ScriptPosition)
{
Operand=operand;
}
//==========================================================================
//
//
//
//==========================================================================
FxUnaryNotBitwise::~FxUnaryNotBitwise()
{
SAFE_DELETE(Operand);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxUnaryNotBitwise::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(Operand, ctx);
if (ctx.FromDecorate && Operand->IsFloat() /* lax */)
{
// DECORATE allows floats here so cast them to int.
Operand = new FxIntCast(Operand, true);
Operand = Operand->Resolve(ctx);
if (Operand == nullptr)
{
delete this;
return nullptr;
}
}
// Names were not blocked in DECORATE here after the scripting branch merge. Now they are again.
if (!Operand->IsInteger())
{
ScriptPosition.Message(MSG_ERROR, "Integer type expected");
delete this;
return nullptr;
}
if (Operand->isConstant())
{
int result = ~static_cast<FxConstant *>(Operand)->GetValue().GetInt();
FxExpression *e = new FxConstant(result, ScriptPosition);
delete this;
return e;
}
ValueType = TypeSInt32;
return this;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxUnaryNotBitwise::Emit(VMFunctionBuilder *build)
{
assert(Operand->ValueType->GetRegType() == REGT_INT);
ExpEmit from = Operand->Emit(build);
assert(!from.Konst);
// Do it in-place.
build->Emit(OP_NOT, from.RegNum, from.RegNum, 0);
return from;
}
//==========================================================================
//
//
//
//==========================================================================
FxUnaryNotBoolean::FxUnaryNotBoolean(FxExpression *operand)
: FxExpression(EFX_UnaryNotBoolean, operand->ScriptPosition)
{
Operand=operand;
}
//==========================================================================
//
//
//
//==========================================================================
FxUnaryNotBoolean::~FxUnaryNotBoolean()
{
SAFE_DELETE(Operand);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxUnaryNotBoolean::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(Operand, ctx);
if (Operand->ValueType != TypeBool)
{
Operand = new FxBoolCast(Operand);
SAFE_RESOLVE(Operand, ctx);
}
if (Operand->isConstant())
{
bool result = !static_cast<FxConstant *>(Operand)->GetValue().GetBool();
FxExpression *e = new FxConstant(result, ScriptPosition);
delete this;
return e;
}
ValueType = TypeBool;
return this;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxUnaryNotBoolean::Emit(VMFunctionBuilder *build)
{
assert(Operand->ValueType == TypeBool);
assert(ValueType == TypeBool || IsInteger()); // this may have been changed by an int cast.
ExpEmit from = Operand->Emit(build);
from.Free(build);
ExpEmit to(build, REGT_INT);
assert(!from.Konst);
// boolean not is the same as XOR-ing the lowest bit
build->Emit(OP_XOR_RK, to.RegNum, from.RegNum, build->GetConstantInt(1));
return to;
}
//==========================================================================
//
//
//
//==========================================================================
FxSizeAlign::FxSizeAlign(FxExpression *operand, int which)
: FxExpression(EFX_SizeAlign, operand->ScriptPosition)
{
Operand = operand;
Which = which;
}
//==========================================================================
//
//
//
//==========================================================================
FxSizeAlign::~FxSizeAlign()
{
SAFE_DELETE(Operand);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxSizeAlign::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(Operand, ctx);
auto type = Operand->ValueType;
if (Operand->isConstant())
{
ScriptPosition.Message(MSG_ERROR, "cannot determine %s of a constant", Which == TK_AlignOf? "alignment" : "size");
delete this;
return nullptr;
}
else if (!Operand->RequestAddress(ctx, nullptr))
{
ScriptPosition.Message(MSG_ERROR, "Operand must be addressable to determine %s", Which == TK_AlignOf ? "alignment" : "size");
delete this;
return nullptr;
}
else
{
FxExpression *x = new FxConstant(Which == TK_AlignOf ? int(type->Align) : int(type->Size), Operand->ScriptPosition);
delete this;
return x->Resolve(ctx);
}
}
ExpEmit FxSizeAlign::Emit(VMFunctionBuilder *build)
{
return ExpEmit();
}
//==========================================================================
//
// FxPreIncrDecr
//
//==========================================================================
FxPreIncrDecr::FxPreIncrDecr(FxExpression *base, int token)
: FxExpression(EFX_PreIncrDecr, base->ScriptPosition), Token(token), Base(base)
{
AddressRequested = false;
AddressWritable = false;
}
FxPreIncrDecr::~FxPreIncrDecr()
{
SAFE_DELETE(Base);
}
bool FxPreIncrDecr::RequestAddress(FCompileContext &ctx, bool *writable)
{
AddressRequested = true;
if (writable != nullptr) *writable = AddressWritable;
return true;
}
FxExpression *FxPreIncrDecr::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(Base, ctx);
ValueType = Base->ValueType;
if (!Base->IsNumeric())
{
ScriptPosition.Message(MSG_ERROR, "Numeric type expected");
delete this;
return nullptr;
}
else if (Base->ValueType == TypeBool)
{
ScriptPosition.Message(MSG_ERROR, "%s is not allowed on type bool", FScanner::TokenName(Token).GetChars());
delete this;
return nullptr;
}
if (!Base->RequestAddress(ctx, &AddressWritable) || !AddressWritable )
{
ScriptPosition.Message(MSG_ERROR, "Expression must be a modifiable value");
delete this;
return nullptr;
}
return this;
}
ExpEmit FxPreIncrDecr::Emit(VMFunctionBuilder *build)
{
assert(Token == TK_Incr || Token == TK_Decr);
assert(ValueType == Base->ValueType && IsNumeric());
int zero = build->GetConstantInt(0);
int regtype = ValueType->GetRegType();
ExpEmit pointer = Base->Emit(build);
ExpEmit value = pointer;
if (!pointer.Target)
{
value = ExpEmit(build, regtype);
build->Emit(ValueType->GetLoadOp(), value.RegNum, pointer.RegNum, zero);
}
if (regtype == REGT_INT)
{
build->Emit(OP_ADDI, value.RegNum, value.RegNum, uint8_t((Token == TK_Incr) ? 1 : -1));
}
else
{
build->Emit((Token == TK_Incr) ? OP_ADDF_RK : OP_SUBF_RK, value.RegNum, value.RegNum, build->GetConstantFloat(1.));
}
if (!pointer.Target)
{
build->Emit(ValueType->GetStoreOp(), pointer.RegNum, value.RegNum, zero);
}
if (AddressRequested)
{
value.Free(build);
return pointer;
}
pointer.Free(build);
return value;
}
//==========================================================================
//
// FxPostIncrDecr
//
//==========================================================================
FxPostIncrDecr::FxPostIncrDecr(FxExpression *base, int token)
: FxExpression(EFX_PostIncrDecr, base->ScriptPosition), Token(token), Base(base)
{
}
FxPostIncrDecr::~FxPostIncrDecr()
{
SAFE_DELETE(Base);
}
FxExpression *FxPostIncrDecr::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(Base, ctx);
bool AddressWritable;
ValueType = Base->ValueType;
if (!Base->IsNumeric())
{
ScriptPosition.Message(MSG_ERROR, "Numeric type expected");
delete this;
return nullptr;
}
else if (Base->ValueType == TypeBool)
{
ScriptPosition.Message(MSG_ERROR, "%s is not allowed on type bool", FScanner::TokenName(Token).GetChars());
delete this;
return nullptr;
}
if (!Base->RequestAddress(ctx, &AddressWritable) || !AddressWritable)
{
ScriptPosition.Message(MSG_ERROR, "Expression must be a modifiable value");
delete this;
return nullptr;
}
return this;
}
ExpEmit FxPostIncrDecr::Emit(VMFunctionBuilder *build)
{
assert(Token == TK_Incr || Token == TK_Decr);
assert(ValueType == Base->ValueType && IsNumeric());
int zero = build->GetConstantInt(0);
int regtype = ValueType->GetRegType();
ExpEmit pointer = Base->Emit(build);
if (!pointer.Target)
{
ExpEmit out(build, regtype);
build->Emit(ValueType->GetLoadOp(), out.RegNum, pointer.RegNum, zero);
ExpEmit assign(build, regtype);
if (regtype == REGT_INT)
{
build->Emit(OP_ADDI, assign.RegNum, out.RegNum, uint8_t((Token == TK_Incr) ? 1 : -1));
}
else
{
build->Emit((Token == TK_Incr) ? OP_ADDF_RK : OP_SUBF_RK, assign.RegNum, out.RegNum, build->GetConstantFloat(1.));
}
build->Emit(ValueType->GetStoreOp(), pointer.RegNum, assign.RegNum, zero);
pointer.Free(build);
assign.Free(build);
return out;
}
else if (NeedResult)
{
ExpEmit out(build, regtype);
if (regtype == REGT_INT)
{
build->Emit(OP_MOVE, out.RegNum, pointer.RegNum);
build->Emit(OP_ADDI, pointer.RegNum, pointer.RegNum, uint8_t((Token == TK_Incr) ? 1 : -1));
}
else
{
build->Emit(OP_MOVEF, out.RegNum, pointer.RegNum);
build->Emit((Token == TK_Incr) ? OP_ADDF_RK : OP_SUBF_RK, pointer.RegNum, pointer.RegNum, build->GetConstantFloat(1.));
}
pointer.Free(build);
return out;
}
else
{
if (regtype == REGT_INT)
{
build->Emit(OP_ADDI, pointer.RegNum, pointer.RegNum, uint8_t((Token == TK_Incr) ? 1 : -1));
}
else
{
build->Emit((Token == TK_Incr) ? OP_ADDF_RK : OP_SUBF_RK, pointer.RegNum, pointer.RegNum, build->GetConstantFloat(1.));
}
pointer.Free(build);
return ExpEmit();
}
}
//==========================================================================
//
// FxAssign
//
//==========================================================================
FxAssign::FxAssign(FxExpression *base, FxExpression *right, bool ismodify)
: FxExpression(EFX_Assign, base->ScriptPosition), Base(base), Right(right), IsBitWrite(-1), IsModifyAssign(ismodify)
{
AddressRequested = false;
AddressWritable = false;
}
FxAssign::~FxAssign()
{
SAFE_DELETE(Base);
SAFE_DELETE(Right);
}
/* I don't think we should allow constructs like (a = b) = c;...
bool FxAssign::RequestAddress(FCompileContext &ctx, bool *writable)
{
AddressRequested = true;
if (writable != nullptr) *writable = AddressWritable;
return true;
}
*/
FxExpression *FxAssign::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(Base, ctx);
ValueType = Base->ValueType;
SAFE_RESOLVE(Right, ctx);
if (IsModifyAssign && Base->ValueType == TypeBool && Right->ValueType != TypeBool)
{
// If the modify operation resulted in a type promotion from bool to int, this must be blocked.
// (this means, for bool, only &=, ^= and |= are allowed, although DECORATE is more lax.)
ScriptPosition.Message(MSG_ERROR, "Invalid modify/assign operation with a boolean operand");
delete this;
return nullptr;
}
// keep the redundant handling for numeric types here to avoid problems with DECORATE.
// for non-numerics FxTypeCast can be used without issues.
if (Base->IsNumeric() && Right->IsNumeric())
{
if (Right->ValueType != ValueType)
{
if (ValueType == TypeBool)
{
Right = new FxBoolCast(Right);
}
else if (ValueType->GetRegType() == REGT_INT)
{
Right = new FxIntCast(Right, ctx.FromDecorate);
}
else
{
Right = new FxFloatCast(Right);
}
SAFE_RESOLVE(Right, ctx);
}
}
else if (Base->ValueType == Right->ValueType)
{
if (Base->ValueType->IsKindOf(RUNTIME_CLASS(PArray)))
{
ScriptPosition.Message(MSG_ERROR, "Cannot assign arrays");
delete this;
return nullptr;
}
if (!Base->IsVector() && Base->ValueType->IsKindOf(RUNTIME_CLASS(PStruct)))
{
ScriptPosition.Message(MSG_ERROR, "Struct assignment not implemented yet");
delete this;
return nullptr;
}
// Both types are the same so this is ok.
}
else if (Right->ValueType->IsA(RUNTIME_CLASS(PNativeStruct)) && Base->ValueType->IsKindOf(RUNTIME_CLASS(PPointer)) && static_cast<PPointer*>(Base->ValueType)->PointedType == Right->ValueType)
{
// allow conversion of native structs to pointers of the same type. This is necessary to assign elements from global arrays like players, sectors, etc. to local pointers.
// For all other types this is not needed. Structs are not assignable and classes can only exist as references.
bool writable;
Right->RequestAddress(ctx, &writable);
Right->ValueType = Base->ValueType;
}
else
{
// pass it to FxTypeCast for complete handling.
Right = new FxTypeCast(Right, Base->ValueType, false);
SAFE_RESOLVE(Right, ctx);
}
if (!Base->RequestAddress(ctx, &AddressWritable) || !AddressWritable)
{
ScriptPosition.Message(MSG_ERROR, "Expression must be a modifiable value");
delete this;
return nullptr;
}
// Special case: Assignment to a bitfield.
IsBitWrite = Base->GetBitValue();
return this;
}
ExpEmit FxAssign::Emit(VMFunctionBuilder *build)
{
static const BYTE loadops[] = { OP_LK, OP_LKF, OP_LKS, OP_LKP };
assert(ValueType == Base->ValueType);
assert(ValueType->GetRegType() == Right->ValueType->GetRegType());
ExpEmit pointer = Base->Emit(build);
Address = pointer;
ExpEmit result = Right->Emit(build);
assert(result.RegType <= REGT_TYPE);
if (pointer.Target)
{
if (result.Konst)
{
build->Emit(loadops[result.RegType], pointer.RegNum, result.RegNum);
}
else
{
build->Emit(Right->ValueType->GetMoveOp(), pointer.RegNum, result.RegNum);
}
}
else
{
if (result.Konst)
{
ExpEmit temp(build, result.RegType);
build->Emit(loadops[result.RegType], temp.RegNum, result.RegNum);
result.Free(build);
result = temp;
}
if (IsBitWrite == -1)
{
build->Emit(ValueType->GetStoreOp(), pointer.RegNum, result.RegNum, build->GetConstantInt(0));
}
else
{
build->Emit(OP_SBIT, pointer.RegNum, result.RegNum, 1 << IsBitWrite);
}
}
if (AddressRequested)
{
result.Free(build);
return pointer;
}
pointer.Free(build);
return result;
}
//==========================================================================
//
// FxAssignSelf
//
//==========================================================================
FxAssignSelf::FxAssignSelf(const FScriptPosition &pos)
: FxExpression(EFX_AssignSelf, pos)
{
Assignment = nullptr;
}
FxExpression *FxAssignSelf::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
// This should never happen if FxAssignSelf is used correctly
assert(Assignment != nullptr);
ValueType = Assignment->ValueType;
return this;
}
ExpEmit FxAssignSelf::Emit(VMFunctionBuilder *build)
{
assert(ValueType == Assignment->ValueType);
ExpEmit pointer = Assignment->Address; // FxAssign should have already emitted it
if (!pointer.Target)
{
ExpEmit out(build, ValueType->GetRegType(), ValueType->GetRegCount());
if (Assignment->IsBitWrite != -1)
{
build->Emit(OP_LBIT, out.RegNum, pointer.RegNum, 1 << Assignment->IsBitWrite);
}
else
{
build->Emit(ValueType->GetLoadOp(), out.RegNum, pointer.RegNum, build->GetConstantInt(0));
}
return out;
}
else
{
return pointer;
}
}
//==========================================================================
//
//
//
//==========================================================================
FxMultiAssign::FxMultiAssign(FArgumentList &base, FxExpression *right, const FScriptPosition &pos)
:FxExpression(EFX_MultiAssign, pos)
{
Base = std::move(base);
Right = right;
LocalVarContainer = new FxCompoundStatement(ScriptPosition);
}
//==========================================================================
//
//
//
//==========================================================================
FxMultiAssign::~FxMultiAssign()
{
SAFE_DELETE(Right);
SAFE_DELETE(LocalVarContainer);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxMultiAssign::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(Right, ctx);
if (Right->ExprType != EFX_VMFunctionCall)
{
Right->ScriptPosition.Message(MSG_ERROR, "Function call expected on right side of multi-assigment");
delete this;
return nullptr;
}
auto VMRight = static_cast<FxVMFunctionCall *>(Right);
auto rets = VMRight->GetReturnTypes();
if (rets.Size() < Base.Size())
{
Right->ScriptPosition.Message(MSG_ERROR, "Insufficient returns in function %s", VMRight->Function->SymbolName.GetChars());
delete this;
return nullptr;
}
// Pack the generated data (temp local variables for the results and necessary type casts and single assignments) into a compound statement for easier management.
for (unsigned i = 0; i < Base.Size(); i++)
{
auto singlevar = new FxLocalVariableDeclaration(rets[i], NAME_None, nullptr, 0, ScriptPosition);
LocalVarContainer->Add(singlevar);
Base[i] = Base[i]->Resolve(ctx);
ABORT(Base[i]);
auto varaccess = new FxLocalVariable(singlevar, ScriptPosition);
auto assignee = new FxTypeCast(varaccess, Base[i]->ValueType, false);
LocalVarContainer->Add(new FxAssign(Base[i], assignee, false));
}
auto x = LocalVarContainer->Resolve(ctx);
LocalVarContainer = nullptr;
ABORT(x);
LocalVarContainer = static_cast<FxCompoundStatement*>(x);
static_cast<FxVMFunctionCall *>(Right)->AssignCount = Base.Size();
ValueType = TypeVoid;
return this;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxMultiAssign::Emit(VMFunctionBuilder *build)
{
Right->Emit(build);
for (unsigned i = 0; i < Base.Size(); i++)
{
LocalVarContainer->LocalVars[i]->SetReg(static_cast<FxVMFunctionCall *>(Right)->ReturnRegs[i]);
}
static_cast<FxVMFunctionCall *>(Right)->ReturnRegs.Clear();
static_cast<FxVMFunctionCall *>(Right)->ReturnRegs.ShrinkToFit();
return LocalVarContainer->Emit(build);
}
//==========================================================================
//
//
//
//==========================================================================
FxBinary::FxBinary(int o, FxExpression *l, FxExpression *r)
: FxExpression(EFX_Binary, l->ScriptPosition)
{
Operator=o;
left=l;
right=r;
}
//==========================================================================
//
//
//
//==========================================================================
FxBinary::~FxBinary()
{
SAFE_DELETE(left);
SAFE_DELETE(right);
}
//==========================================================================
//
//
//
//==========================================================================
bool FxBinary::Promote(FCompileContext &ctx, bool forceint)
{
// math operations of unsigned ints results in an unsigned int. (16 and 8 bit values never get here, they get promoted to regular ints elsewhere already.)
if (left->ValueType == TypeUInt32 && right->ValueType == TypeUInt32)
{
ValueType = TypeUInt32;
}
else if (left->IsInteger() && right->IsInteger())
{
ValueType = TypeSInt32; // Addition and subtraction forces all integer-derived types to signed int.
}
else if (!forceint)
{
ValueType = TypeFloat64;
if (left->IsFloat() && right->IsInteger())
{
right = (new FxFloatCast(right))->Resolve(ctx);
}
else if (left->IsInteger() && right->IsFloat())
{
left = (new FxFloatCast(left))->Resolve(ctx);
}
}
else if (ctx.FromDecorate)
{
// For DECORATE which allows floats here. ZScript does not.
if (left->IsFloat())
{
left = new FxIntCast(left, ctx.FromDecorate);
left = left->Resolve(ctx);
}
if (right->IsFloat())
{
right = new FxIntCast(right, ctx.FromDecorate);
right = right->Resolve(ctx);
}
if (left == nullptr || right == nullptr)
{
delete this;
return false;
}
ValueType = TypeSInt32;
}
else
{
ScriptPosition.Message(MSG_ERROR, "Integer operand expected");
delete this;
return false;
}
return true;
}
//==========================================================================
//
//
//
//==========================================================================
FxAddSub::FxAddSub(int o, FxExpression *l, FxExpression *r)
: FxBinary(o, l, r)
{
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxAddSub::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
RESOLVE(left, ctx);
RESOLVE(right, ctx);
if (!left || !right)
{
delete this;
return nullptr;
}
if (left->ValueType == TypeState && right->IsInteger() && Operator == '+' && !left->isConstant())
{
// This is the only special case of pointer addition that will be accepted - because it is used quite often in the existing game code.
ValueType = TypeState;
right = new FxMulDiv('*', right, new FxConstant((int)sizeof(FState), ScriptPosition)); // multiply by size here, so that constants can be better optimized.
right = right->Resolve(ctx);
ABORT(right);
}
else if (left->IsVector() && right->IsVector())
{
// a vector2 can be added to or subtracted from a vector 3 but it needs to be the right operand.
if (left->ValueType == right->ValueType || (left->ValueType == TypeVector3 && right->ValueType == TypeVector2))
{
ValueType = left->ValueType;
}
else
{
goto error;
}
}
else if (left->IsNumeric() && right->IsNumeric())
{
Promote(ctx);
}
else
{
// To check: It may be that this could pass in DECORATE, although setting TypeVoid here would pretty much prevent that.
goto error;
}
if (left->isConstant() && right->isConstant())
{
if (IsFloat())
{
double v;
double v1 = static_cast<FxConstant *>(left)->GetValue().GetFloat();
double v2 = static_cast<FxConstant *>(right)->GetValue().GetFloat();
v = Operator == '+'? v1 + v2 :
Operator == '-'? v1 - v2 : 0;
FxExpression *e = new FxConstant(v, ScriptPosition);
delete this;
return e;
}
else
{
int v;
int v1 = static_cast<FxConstant *>(left)->GetValue().GetInt();
int v2 = static_cast<FxConstant *>(right)->GetValue().GetInt();
v = Operator == '+'? v1 + v2 :
Operator == '-'? v1 - v2 : 0;
FxExpression *e = new FxConstant(v, ScriptPosition);
delete this;
return e;
}
}
return this;
error:
ScriptPosition.Message(MSG_ERROR, "Incompatible operands for %s", Operator == '+' ? "addition" : "subtraction");
delete this;
return nullptr;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxAddSub::Emit(VMFunctionBuilder *build)
{
assert(Operator == '+' || Operator == '-');
ExpEmit op1 = left->Emit(build);
ExpEmit op2 = right->Emit(build);
if (Operator == '+')
{
if (op1.RegType == REGT_POINTER)
{
assert(!op1.Konst);
assert(op2.RegType == REGT_INT);
op1.Free(build);
op2.Free(build);
ExpEmit opout(build, REGT_POINTER);
build->Emit(op2.Konst? OP_ADDA_RK : OP_ADDA_RR, opout.RegNum, op1.RegNum, op2.RegNum);
return opout;
}
// Since addition is commutative, only the second operand may be a constant.
if (op1.Konst)
{
swapvalues(op1, op2);
}
assert(!op1.Konst);
op1.Free(build);
op2.Free(build);
ExpEmit to(build, ValueType->GetRegType(), ValueType->GetRegCount());
if (IsVector())
{
assert(op1.RegType == REGT_FLOAT && op2.RegType == REGT_FLOAT);
build->Emit(right->ValueType == TypeVector2? OP_ADDV2_RR : OP_ADDV3_RR, to.RegNum, op1.RegNum, op2.RegNum);
if (left->ValueType == TypeVector3 && right->ValueType == TypeVector2 && to.RegNum != op1.RegNum)
{
// must move the z-coordinate
build->Emit(OP_MOVEF, to.RegNum + 2, op1.RegNum + 2);
}
return to;
}
else if (ValueType->GetRegType() == REGT_FLOAT)
{
assert(op1.RegType == REGT_FLOAT && op2.RegType == REGT_FLOAT);
build->Emit(op2.Konst ? OP_ADDF_RK : OP_ADDF_RR, to.RegNum, op1.RegNum, op2.RegNum);
return to;
}
else
{
assert(ValueType->GetRegType() == REGT_INT);
assert(op1.RegType == REGT_INT && op2.RegType == REGT_INT);
build->Emit(op2.Konst ? OP_ADD_RK : OP_ADD_RR, to.RegNum, op1.RegNum, op2.RegNum);
return to;
}
}
else
{
// Subtraction is not commutative, so either side may be constant (but not both).
assert(!op1.Konst || !op2.Konst);
op1.Free(build);
op2.Free(build);
ExpEmit to(build, ValueType->GetRegType(), ValueType->GetRegCount());
if (IsVector())
{
assert(op1.RegType == REGT_FLOAT && op2.RegType == REGT_FLOAT);
build->Emit(right->ValueType == TypeVector2 ? OP_SUBV2_RR : OP_SUBV3_RR, to.RegNum, op1.RegNum, op2.RegNum);
return to;
}
else if (ValueType->GetRegType() == REGT_FLOAT)
{
assert(op1.RegType == REGT_FLOAT && op2.RegType == REGT_FLOAT);
build->Emit(op1.Konst ? OP_SUBF_KR : op2.Konst ? OP_SUBF_RK : OP_SUBF_RR, to.RegNum, op1.RegNum, op2.RegNum);
return to;
}
else
{
assert(ValueType->GetRegType() == REGT_INT);
assert(op1.RegType == REGT_INT && op2.RegType == REGT_INT);
build->Emit(op1.Konst ? OP_SUB_KR : op2.Konst ? OP_SUB_RK : OP_SUB_RR, to.RegNum, op1.RegNum, op2.RegNum);
return to;
}
}
}
//==========================================================================
//
//
//
//==========================================================================
FxMulDiv::FxMulDiv(int o, FxExpression *l, FxExpression *r)
: FxBinary(o, l, r)
{
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxMulDiv::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
RESOLVE(left, ctx);
RESOLVE(right, ctx);
if (!left || !right)
{
delete this;
return nullptr;
}
if (left->IsVector() || right->IsVector())
{
switch (Operator)
{
case '/':
// For division, the vector must be the first operand.
if (right->IsVector()) goto error;
case '*':
if (left->IsVector() && right->IsNumeric())
{
if (right->IsInteger())
{
right = new FxFloatCast(right);
right = right->Resolve(ctx);
if (right == nullptr)
{
delete this;
return nullptr;
}
}
ValueType = left->ValueType;
}
else if (right->IsVector() && left->IsNumeric())
{
if (left->IsInteger())
{
left = new FxFloatCast(left);
left = left->Resolve(ctx);
if (left == nullptr)
{
delete this;
return nullptr;
}
}
ValueType = right->ValueType;
}
break;
default:
// Vector modulus is not permitted
goto error;
}
}
else if (left->IsNumeric() && right->IsNumeric())
{
Promote(ctx);
}
else
{
// To check: It may be that this could pass in DECORATE, although setting TypeVoid here would pretty much prevent that.
goto error;
}
if (left->isConstant() && right->isConstant())
{
if (IsFloat())
{
double v;
double v1 = static_cast<FxConstant *>(left)->GetValue().GetFloat();
double v2 = static_cast<FxConstant *>(right)->GetValue().GetFloat();
if (Operator != '*' && v2 == 0)
{
ScriptPosition.Message(MSG_ERROR, "Division by 0");
delete this;
return nullptr;
}
v = Operator == '*'? v1 * v2 :
Operator == '/'? v1 / v2 :
Operator == '%'? fmod(v1, v2) : 0;
FxExpression *e = new FxConstant(v, ScriptPosition);
delete this;
return e;
}
else
{
int v;
int v1 = static_cast<FxConstant *>(left)->GetValue().GetInt();
int v2 = static_cast<FxConstant *>(right)->GetValue().GetInt();
if (Operator != '*' && v2 == 0)
{
ScriptPosition.Message(MSG_ERROR, "Division by 0");
delete this;
return nullptr;
}
v = Operator == '*'? v1 * v2 :
Operator == '/'? v1 / v2 :
Operator == '%'? v1 % v2 : 0;
FxExpression *e = new FxConstant(v, ScriptPosition);
delete this;
return e;
}
}
return this;
error:
ScriptPosition.Message(MSG_ERROR, "Incompatible operands for %s", Operator == '*' ? "multiplication" : Operator == '%' ? "modulus" : "division");
delete this;
return nullptr;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxMulDiv::Emit(VMFunctionBuilder *build)
{
ExpEmit op1 = left->Emit(build);
ExpEmit op2 = right->Emit(build);
if (IsVector())
{
assert(Operator != '%');
if (right->IsVector())
{
swapvalues(op1, op2);
}
int op;
if (op2.Konst)
{
op = Operator == '*' ? (ValueType == TypeVector2 ? OP_MULVF2_RK : OP_MULVF3_RK) : (ValueType == TypeVector2 ? OP_DIVVF2_RK : OP_DIVVF3_RK);
}
else
{
op = Operator == '*' ? (ValueType == TypeVector2 ? OP_MULVF2_RR : OP_MULVF3_RR) : (ValueType == TypeVector2 ? OP_DIVVF2_RR : OP_DIVVF3_RR);
}
op1.Free(build);
op2.Free(build);
ExpEmit to(build, ValueType->GetRegType(), ValueType->GetRegCount());
build->Emit(op, to.RegNum, op1.RegNum, op2.RegNum);
return to;
}
if (Operator == '*')
{
// Multiplication is commutative, so only the second operand may be constant.
if (op1.Konst)
{
swapvalues(op1, op2);
}
assert(!op1.Konst);
op1.Free(build);
op2.Free(build);
ExpEmit to(build, ValueType->GetRegType());
if (ValueType->GetRegType() == REGT_FLOAT)
{
assert(op1.RegType == REGT_FLOAT && op2.RegType == REGT_FLOAT);
build->Emit(op2.Konst ? OP_MULF_RK : OP_MULF_RR, to.RegNum, op1.RegNum, op2.RegNum);
return to;
}
else
{
assert(ValueType->GetRegType() == REGT_INT);
assert(op1.RegType == REGT_INT && op2.RegType == REGT_INT);
build->Emit(op2.Konst ? OP_MUL_RK : OP_MUL_RR, to.RegNum, op1.RegNum, op2.RegNum);
return to;
}
}
else
{
// Division is not commutative, so either side may be constant (but not both).
assert(!op1.Konst || !op2.Konst);
assert(Operator == '%' || Operator == '/');
op1.Free(build);
op2.Free(build);
ExpEmit to(build, ValueType->GetRegType());
if (ValueType->GetRegType() == REGT_FLOAT)
{
assert(op1.RegType == REGT_FLOAT && op2.RegType == REGT_FLOAT);
build->Emit(Operator == '/' ? (op1.Konst ? OP_DIVF_KR : op2.Konst ? OP_DIVF_RK : OP_DIVF_RR)
: (op1.Konst ? OP_MODF_KR : op2.Konst ? OP_MODF_RK : OP_MODF_RR),
to.RegNum, op1.RegNum, op2.RegNum);
return to;
}
else
{
assert(ValueType->GetRegType() == REGT_INT);
assert(op1.RegType == REGT_INT && op2.RegType == REGT_INT);
if (ValueType == TypeUInt32)
{
build->Emit(Operator == '/' ? (op1.Konst ? OP_DIVU_KR : op2.Konst ? OP_DIVU_RK : OP_DIVU_RR)
: (op1.Konst ? OP_MODU_KR : op2.Konst ? OP_MODU_RK : OP_MODU_RR),
to.RegNum, op1.RegNum, op2.RegNum);
}
else
{
build->Emit(Operator == '/' ? (op1.Konst ? OP_DIV_KR : op2.Konst ? OP_DIV_RK : OP_DIV_RR)
: (op1.Konst ? OP_MOD_KR : op2.Konst ? OP_MOD_RK : OP_MOD_RR),
to.RegNum, op1.RegNum, op2.RegNum);
}
return to;
}
}
}
//==========================================================================
//
//
//
//==========================================================================
FxPow::FxPow(FxExpression *l, FxExpression *r)
: FxBinary(TK_MulMul, new FxFloatCast(l), new FxFloatCast(r))
{
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxPow::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
RESOLVE(left, ctx);
RESOLVE(right, ctx);
if (!left || !right)
{
delete this;
return nullptr;
}
if (!left->IsNumeric() || !right->IsNumeric())
{
ScriptPosition.Message(MSG_ERROR, "Numeric type expected for '**'");
delete this;
return nullptr;
}
if (!left->IsFloat())
{
left = (new FxFloatCast(left))->Resolve(ctx);
ABORT(left);
}
if (!right->IsFloat())
{
right = (new FxFloatCast(right))->Resolve(ctx);
ABORT(right);
}
if (left->isConstant() && right->isConstant())
{
double v1 = static_cast<FxConstant *>(left)->GetValue().GetFloat();
double v2 = static_cast<FxConstant *>(right)->GetValue().GetFloat();
return new FxConstant(g_pow(v1, v2), left->ScriptPosition);
}
return this;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxPow::Emit(VMFunctionBuilder *build)
{
ExpEmit op1 = left->Emit(build);
ExpEmit op2 = right->Emit(build);
// Pow is not commutative, so either side may be constant (but not both).
assert(!op1.Konst || !op2.Konst);
op1.Free(build);
op2.Free(build);
assert(op1.RegType == REGT_FLOAT && op2.RegType == REGT_FLOAT);
ExpEmit to(build, REGT_FLOAT);
build->Emit((op1.Konst ? OP_POWF_KR : op2.Konst ? OP_POWF_RK : OP_POWF_RR), to.RegNum, op1.RegNum, op2.RegNum);
return to;
}
//==========================================================================
//
//
//
//==========================================================================
FxCompareRel::FxCompareRel(int o, FxExpression *l, FxExpression *r)
: FxBinary(o, l, r)
{
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxCompareRel::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
RESOLVE(left, ctx);
RESOLVE(right, ctx);
if (!left || !right)
{
delete this;
return nullptr;
}
if (left->ValueType == TypeString || right->ValueType == TypeString)
{
if (left->ValueType != TypeString)
{
left = new FxStringCast(left);
left = left->Resolve(ctx);
if (left == nullptr)
{
delete this;
return nullptr;
}
}
if (right->ValueType != TypeString)
{
right = new FxStringCast(right);
right = right->Resolve(ctx);
if (right == nullptr)
{
delete this;
return nullptr;
}
}
ValueType = TypeString;
}
else if (left->IsNumeric() && right->IsNumeric())
{
Promote(ctx);
}
else
{
ScriptPosition.Message(MSG_ERROR, "Incompatible operands for relative comparison");
delete this;
return nullptr;
}
if (left->isConstant() && right->isConstant())
{
int v;
if (ValueType == TypeString)
{
FString v1 = static_cast<FxConstant *>(left)->GetValue().GetString();
FString v2 = static_cast<FxConstant *>(right)->GetValue().GetString();
int res = v1.Compare(v2);
v = Operator == '<' ? res < 0 :
Operator == '>' ? res > 0 :
Operator == TK_Geq ? res >= 0 :
Operator == TK_Leq ? res <= 0 : 0;
}
else if (IsFloat())
{
double v1 = static_cast<FxConstant *>(left)->GetValue().GetFloat();
double v2 = static_cast<FxConstant *>(right)->GetValue().GetFloat();
v = Operator == '<'? v1 < v2 :
Operator == '>'? v1 > v2 :
Operator == TK_Geq? v1 >= v2 :
Operator == TK_Leq? v1 <= v2 : 0;
}
else if (ValueType == TypeUInt32)
{
int v1 = static_cast<FxConstant *>(left)->GetValue().GetUInt();
int v2 = static_cast<FxConstant *>(right)->GetValue().GetUInt();
v = Operator == '<'? v1 < v2 :
Operator == '>'? v1 > v2 :
Operator == TK_Geq? v1 >= v2 :
Operator == TK_Leq? v1 <= v2 : 0;
}
else
{
int v1 = static_cast<FxConstant *>(left)->GetValue().GetInt();
int v2 = static_cast<FxConstant *>(right)->GetValue().GetInt();
v = Operator == '<' ? v1 < v2 :
Operator == '>' ? v1 > v2 :
Operator == TK_Geq ? v1 >= v2 :
Operator == TK_Leq ? v1 <= v2 : 0;
}
FxExpression *e = new FxConstant(v, ScriptPosition);
delete this;
return e;
}
CompareType = ValueType; // needs to be preserved for detection of unsigned compare.
ValueType = TypeBool;
return this;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxCompareRel::Emit(VMFunctionBuilder *build)
{
ExpEmit op1 = left->Emit(build);
ExpEmit op2 = right->Emit(build);
assert(op1.RegType == op2.RegType);
assert(!op1.Konst || !op2.Konst);
if (op1.RegType == REGT_STRING)
{
ExpEmit to(build, REGT_INT);
int a = Operator == '<' ? CMP_LT :
Operator == '>' ? CMP_LE | CMP_CHECK :
Operator == TK_Geq ? CMP_LT | CMP_CHECK : CMP_LE;
if (op1.Konst)
{
a |= CMP_BK;
}
else
{
op1.Free(build);
}
if (op2.Konst)
{
a |= CMP_CK;
}
else
{
op2.Free(build);
}
build->Emit(OP_LI, to.RegNum, 0, 0);
build->Emit(OP_CMPS, a, op1.RegNum, op2.RegNum);
build->Emit(OP_JMP, 1);
build->Emit(OP_LI, to.RegNum, 1);
return to;
}
else
{
assert(op1.RegType == REGT_INT || op1.RegType == REGT_FLOAT);
assert(Operator == '<' || Operator == '>' || Operator == TK_Geq || Operator == TK_Leq);
static const VM_UBYTE InstrMap[][4] =
{
{ OP_LT_RR, OP_LTF_RR, OP_LTU_RR, 0 }, // <
{ OP_LE_RR, OP_LEF_RR, OP_LEU_RR, 1 }, // >
{ OP_LT_RR, OP_LTF_RR, OP_LTU_RR, 1 }, // >=
{ OP_LE_RR, OP_LEF_RR, OP_LEU_RR, 0 } // <=
};
int instr, check;
ExpEmit to(build, REGT_INT);
int index = Operator == '<' ? 0 :
Operator == '>' ? 1 :
Operator == TK_Geq ? 2 : 3;
int mode = op1.RegType == REGT_FLOAT ? 1 : CompareType == TypeUInt32 ? 2 : 0;
instr = InstrMap[index][mode];
check = InstrMap[index][3];
if (op2.Konst)
{
instr += 1;
}
else
{
op2.Free(build);
}
if (op1.Konst)
{
instr += 2;
}
else
{
op1.Free(build);
}
// See FxBoolCast for comments, since it's the same thing.
build->Emit(OP_LI, to.RegNum, 0, 0);
build->Emit(instr, check, op1.RegNum, op2.RegNum);
build->Emit(OP_JMP, 1);
build->Emit(OP_LI, to.RegNum, 1);
return to;
}
}
//==========================================================================
//
//
//
//==========================================================================
FxCompareEq::FxCompareEq(int o, FxExpression *l, FxExpression *r)
: FxBinary(o, l, r)
{
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxCompareEq::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
RESOLVE(left, ctx);
RESOLVE(right, ctx);
if (!left || !right)
{
delete this;
return nullptr;
}
if (left->ValueType != right->ValueType) // identical types are always comparable, if they can be placed in a register, so we can save most checks if this is the case.
{
// Special cases: Compare strings and names with names, sounds, colors, state labels and class types.
// These are all types a string can be implicitly cast into, so for convenience, so they should when doing a comparison.
if ((left->ValueType == TypeString || left->ValueType == TypeName) &&
(right->ValueType == TypeName || right->ValueType == TypeSound || right->ValueType == TypeColor || right->ValueType->IsKindOf(RUNTIME_CLASS(PClassPointer)) || right->ValueType == TypeStateLabel))
{
left = new FxTypeCast(left, right->ValueType, false, true);
left = left->Resolve(ctx);
ABORT(left);
ValueType = right->ValueType;
}
else if ((right->ValueType == TypeString || right->ValueType == TypeName) &&
(left->ValueType == TypeName || left->ValueType == TypeSound || left->ValueType == TypeColor || left->ValueType->IsKindOf(RUNTIME_CLASS(PClassPointer)) || left->ValueType == TypeStateLabel))
{
right = new FxTypeCast(right, left->ValueType, false, true);
right = right->Resolve(ctx);
ABORT(right);
ValueType = left->ValueType;
}
else if (left->IsNumeric() && right->IsNumeric())
{
Promote(ctx);
}
else if (left->ValueType->GetRegType() == REGT_POINTER && right->ValueType->GetRegType() == REGT_POINTER)
{
if (left->ValueType != right->ValueType && right->ValueType != TypeNullPtr && left->ValueType != TypeNullPtr &&
!AreCompatiblePointerTypes(left->ValueType, right->ValueType, true))
{
goto error;
}
}
else
{
goto error;
}
}
else if (left->ValueType->GetRegType() == REGT_NIL)
{
goto error;
}
else
{
ValueType = left->ValueType;
}
if (Operator == TK_ApproxEq && ValueType->GetRegType() != REGT_FLOAT && ValueType->GetRegType() != REGT_STRING)
{
// Only floats, vectors and strings have handling for '~==', for all other types this is an error.
goto error;
}
if (left->isConstant() && right->isConstant())
{
int v;
if (ValueType == TypeString)
{
FString v1 = static_cast<FxConstant *>(left)->GetValue().GetString();
FString v2 = static_cast<FxConstant *>(right)->GetValue().GetString();
if (Operator == TK_ApproxEq) v = !v1.CompareNoCase(v2);
else
{
v = !!v1.Compare(v2);
if (Operator == TK_Eq) v = !v;
}
}
else if (ValueType->GetRegType() == REGT_FLOAT)
{
double v1 = static_cast<FxConstant *>(left)->GetValue().GetFloat();
double v2 = static_cast<FxConstant *>(right)->GetValue().GetFloat();
v = Operator == TK_Eq? v1 == v2 : Operator == TK_Neq? v1 != v2 : fabs(v1-v2) < VM_EPSILON;
}
else
{
int v1 = static_cast<FxConstant *>(left)->GetValue().GetInt();
int v2 = static_cast<FxConstant *>(right)->GetValue().GetInt();
v = Operator == TK_Eq? v1 == v2 : v1 != v2;
}
FxExpression *e = new FxConstant(v, ScriptPosition);
delete this;
return e;
}
else
{
// also simplify comparisons against zero. For these a bool cast/unary not on the other value will do just as well and create better code.
if (Operator != TK_ApproxEq)
{
if (left->isConstant())
{
bool leftisnull;
switch (left->ValueType->GetRegType())
{
case REGT_INT:
leftisnull = static_cast<FxConstant *>(left)->GetValue().GetInt() == 0;
break;
case REGT_FLOAT:
assert(left->ValueType->GetRegCount() == 1); // vectors should not be able to get here.
leftisnull = static_cast<FxConstant *>(left)->GetValue().GetFloat() == 0;
break;
case REGT_POINTER:
leftisnull = static_cast<FxConstant *>(left)->GetValue().GetPointer() == nullptr;
break;
default:
leftisnull = false;
}
if (leftisnull)
{
FxExpression *x;
if (Operator == TK_Eq) x = new FxUnaryNotBoolean(right);
else x = new FxBoolCast(right);
right = nullptr;
delete this;
return x->Resolve(ctx);
}
}
if (right->isConstant())
{
bool rightisnull;
switch (right->ValueType->GetRegType())
{
case REGT_INT:
rightisnull = static_cast<FxConstant *>(right)->GetValue().GetInt() == 0;
break;
case REGT_FLOAT:
assert(right->ValueType->GetRegCount() == 1); // vectors should not be able to get here.
rightisnull = static_cast<FxConstant *>(right)->GetValue().GetFloat() == 0;
break;
case REGT_POINTER:
rightisnull = static_cast<FxConstant *>(right)->GetValue().GetPointer() == nullptr;
break;
default:
rightisnull = false;
}
if (rightisnull)
{
FxExpression *x;
if (Operator == TK_Eq) x = new FxUnaryNotBoolean(left);
else x = new FxBoolCast(left);
left = nullptr;
delete this;
return x->Resolve(ctx);
}
}
}
}
ValueType = TypeBool;
return this;
error:
ScriptPosition.Message(MSG_ERROR, "Incompatible operands for %s comparison", Operator == TK_Eq ? "==" : Operator == TK_Neq ? "!=" : "~==");
delete this;
return nullptr;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxCompareEq::Emit(VMFunctionBuilder *build)
{
ExpEmit op1 = left->Emit(build);
ExpEmit op2 = right->Emit(build);
assert(op1.RegType == op2.RegType);
int instr;
if (op1.RegType == REGT_STRING)
{
ExpEmit to(build, REGT_INT);
assert(Operator == TK_Eq || Operator == TK_Neq || Operator == TK_ApproxEq);
int a = Operator == TK_Eq ? CMP_EQ :
Operator == TK_Neq ? CMP_EQ | CMP_CHECK : CMP_EQ | CMP_APPROX;
if (op1.Konst) a|= CMP_BK;
if (op2.Konst) a |= CMP_CK;
build->Emit(OP_LI, to.RegNum, 0, 0);
build->Emit(OP_CMPS, a, op1.RegNum, op2.RegNum);
build->Emit(OP_JMP, 1);
build->Emit(OP_LI, to.RegNum, 1);
op1.Free(build);
op2.Free(build);
return to;
}
else
{
// Only the second operand may be constant.
if (op1.Konst)
{
swapvalues(op1, op2);
}
assert(!op1.Konst);
assert(op1.RegCount >= 1 && op1.RegCount <= 3);
ExpEmit to(build, REGT_INT);
static int flops[] = { OP_EQF_R, OP_EQV2_R, OP_EQV3_R };
instr = op1.RegType == REGT_INT ? OP_EQ_R :
op1.RegType == REGT_FLOAT ? flops[op1.RegCount - 1] :
OP_EQA_R;
op1.Free(build);
if (!op2.Konst)
{
op2.Free(build);
}
else
{
instr += 1;
}
// See FxUnaryNotBoolean for comments, since it's the same thing.
build->Emit(OP_LI, to.RegNum, 0, 0);
build->Emit(instr, Operator == TK_ApproxEq ? CMP_APPROX : ((Operator != TK_Eq) ? CMP_CHECK : 0), op1.RegNum, op2.RegNum);
build->Emit(OP_JMP, 1);
build->Emit(OP_LI, to.RegNum, 1);
return to;
}
}
//==========================================================================
//
//
//
//==========================================================================
FxBitOp::FxBitOp(int o, FxExpression *l, FxExpression *r)
: FxBinary(o, l, r)
{
ValueType = TypeSInt32;
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxBitOp::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
RESOLVE(left, ctx);
RESOLVE(right, ctx);
if (!left || !right)
{
delete this;
return nullptr;
}
if (left->ValueType == TypeBool && right->ValueType == TypeBool)
{
ValueType = TypeBool;
}
else if (left->IsNumeric() && right->IsNumeric())
{
if (!Promote(ctx, true)) return nullptr;
}
else
{
ScriptPosition.Message(MSG_ERROR, "Incompatible operands for bit operation");
delete this;
return nullptr;
}
if (left->isConstant() && right->isConstant())
{
int v1 = static_cast<FxConstant *>(left)->GetValue().GetInt();
int v2 = static_cast<FxConstant *>(right)->GetValue().GetInt();
FxExpression *e = new FxConstant(
Operator == '&'? v1 & v2 :
Operator == '|'? v1 | v2 :
Operator == '^'? v1 ^ v2 : 0, ScriptPosition);
delete this;
return e;
}
return this;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxBitOp::Emit(VMFunctionBuilder *build)
{
assert(left->ValueType->GetRegType() == REGT_INT);
assert(right->ValueType->GetRegType() == REGT_INT);
int instr, rop;
ExpEmit op1, op2;
op1 = left->Emit(build);
op2 = right->Emit(build);
if (op1.Konst)
{
swapvalues(op1, op2);
}
assert(!op1.Konst);
rop = op2.RegNum;
op2.Free(build);
op1.Free(build);
instr = Operator == '&' ? OP_AND_RR :
Operator == '|' ? OP_OR_RR :
Operator == '^' ? OP_XOR_RR : -1;
assert(instr > 0);
ExpEmit to(build, REGT_INT);
build->Emit(instr + op2.Konst, to.RegNum, op1.RegNum, rop);
return to;
}
//==========================================================================
//
//
//
//==========================================================================
FxShift::FxShift(int o, FxExpression *l, FxExpression *r)
: FxBinary(o, l, r)
{
ValueType = TypeSInt32;
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxShift::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
RESOLVE(left, ctx);
RESOLVE(right, ctx);
if (!left || !right)
{
delete this;
return nullptr;
}
if (left->IsNumeric() && right->IsNumeric())
{
if (!Promote(ctx, true)) return nullptr;
if (ValueType == TypeUInt32 && Operator == TK_RShift) Operator = TK_URShift;
}
else
{
ScriptPosition.Message(MSG_ERROR, "Incompatible operands for shift operation");
delete this;
return nullptr;
}
if (left->isConstant() && right->isConstant())
{
int v1 = static_cast<FxConstant *>(left)->GetValue().GetInt();
int v2 = static_cast<FxConstant *>(right)->GetValue().GetInt();
FxExpression *e = new FxConstant(
Operator == TK_LShift ? v1 << v2 :
Operator == TK_RShift ? v1 >> v2 :
Operator == TK_URShift ? int((unsigned int)(v1) >> v2) : 0, ScriptPosition);
delete this;
return e;
}
return this;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxShift::Emit(VMFunctionBuilder *build)
{
assert(left->ValueType->GetRegType() == REGT_INT);
assert(right->ValueType->GetRegType() == REGT_INT);
static const VM_UBYTE InstrMap[][4] =
{
{ OP_SLL_RR, OP_SLL_KR, OP_SLL_RI }, // TK_LShift
{ OP_SRA_RR, OP_SRA_KR, OP_SRA_RI }, // TK_RShift
{ OP_SRL_RR, OP_SRL_KR, OP_SRL_RI }, // TK_URShift
};
int index, instr, rop;
ExpEmit op1, op2;
index = Operator == TK_LShift ? 0 :
Operator == TK_RShift ? 1 :
Operator == TK_URShift ? 2 : -1;
assert(index >= 0);
op1 = left->Emit(build);
// Shift instructions use right-hand immediates instead of constant registers.
if (right->isConstant())
{
rop = static_cast<FxConstant *>(right)->GetValue().GetInt();
op2.Konst = true;
}
else
{
op2 = right->Emit(build);
assert(!op2.Konst);
op2.Free(build);
rop = op2.RegNum;
}
if (!op1.Konst)
{
op1.Free(build);
instr = InstrMap[index][op2.Konst? 2:0];
}
else
{
assert(!op2.Konst);
instr = InstrMap[index][1];
}
assert(instr != 0);
ExpEmit to(build, REGT_INT);
build->Emit(instr, to.RegNum, op1.RegNum, rop);
return to;
}
//==========================================================================
//
//
//
//==========================================================================
FxLtGtEq::FxLtGtEq(FxExpression *l, FxExpression *r)
: FxBinary(TK_LtGtEq, l, r)
{
ValueType = TypeSInt32;
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxLtGtEq::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
RESOLVE(left, ctx);
RESOLVE(right, ctx);
if (!left || !right)
{
delete this;
return nullptr;
}
if (left->IsNumeric() && right->IsNumeric())
{
Promote(ctx);
}
else
{
ScriptPosition.Message(MSG_ERROR, "<>= expects two numeric operands");
delete this;
return nullptr;
}
if (left->isConstant() && right->isConstant())
{
// let's cut this short and always compare doubles. For integers the result will be exactly the same as with an integer comparison, either signed or unsigned.
auto v1 = static_cast<FxConstant *>(left)->GetValue().GetFloat();
auto v2 = static_cast<FxConstant *>(right)->GetValue().GetFloat();
auto e = new FxConstant(v1 < v2 ? -1 : v1 > v2 ? 1 : 0, ScriptPosition);
delete this;
return e;
}
return this;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxLtGtEq::Emit(VMFunctionBuilder *build)
{
ExpEmit op1 = left->Emit(build);
ExpEmit op2 = right->Emit(build);
assert(op1.RegType == op2.RegType);
assert(op1.RegType == REGT_INT || op1.RegType == REGT_FLOAT);
assert(!op1.Konst || !op2.Konst);
ExpEmit to(build, REGT_INT);
int instr = op1.RegType == REGT_INT ? (left->ValueType == TypeUInt32? OP_LTU_RR : OP_LT_RR) : OP_LTF_RR;
if (op1.Konst) instr += 2;
if (op2.Konst) instr++;
build->Emit(OP_LI, to.RegNum, 1); // default to 1
build->Emit(instr, 0, op1.RegNum, op2.RegNum); // if (left < right)
auto j1 = build->Emit(OP_JMP, 1);
build->Emit(OP_LI, to.RegNum, -1); // result is -1
auto j2 = build->Emit(OP_JMP, 1); // jump to end
build->BackpatchToHere(j1);
build->Emit(instr + OP_LE_RR - OP_LT_RR, 0, op1.RegNum, op2.RegNum); // if (left == right)
auto j3 = build->Emit(OP_JMP, 1);
build->Emit(OP_LI, to.RegNum, 0); // result is 0
build->BackpatchToHere(j2);
build->BackpatchToHere(j3);
return to;
}
//==========================================================================
//
//
//
//==========================================================================
FxConcat::FxConcat(FxExpression *l, FxExpression *r)
: FxBinary(TK_DotDot, l, r)
{
ValueType = TypeString;
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxConcat::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
RESOLVE(left, ctx);
RESOLVE(right, ctx);
if (!left || !right)
{
delete this;
return nullptr;
}
// To concatenate two operands the only requirement is that they are integral types, i.e. can occupy a register
if (left->ValueType->GetRegType() == REGT_NIL || right->ValueType->GetRegType() == REGT_NIL)
{
ScriptPosition.Message(MSG_ERROR, "Invalid operand for string concatenation");
delete this;
return nullptr;
}
if (left->isConstant() && right->isConstant() && (left->ValueType == TypeString || left->ValueType == TypeName) && (right->ValueType == TypeString || right->ValueType == TypeName))
{
// for now this is only types which have a constant string representation.
auto v1 = static_cast<FxConstant *>(left)->GetValue().GetString();
auto v2 = static_cast<FxConstant *>(right)->GetValue().GetString();
auto e = new FxConstant(v1 + v2, ScriptPosition);
delete this;
return e;
}
return this;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxConcat::Emit(VMFunctionBuilder *build)
{
ExpEmit op1 = left->Emit(build);
ExpEmit op2 = right->Emit(build);
ExpEmit strng, strng2;
if (op1.RegType == REGT_STRING && op1.Konst)
{
strng = ExpEmit(build, REGT_STRING);
build->Emit(OP_LKS, strng.RegNum, op1.RegNum);
}
else if (op1.RegType == REGT_STRING)
{
strng = op1;
}
else
{
int cast;
strng = ExpEmit(build, REGT_STRING);
if (op1.Konst)
{
ExpEmit nonconst(build, op1.RegType);
build->Emit(op1.RegType == REGT_INT ? OP_LK : op1.RegType == REGT_FLOAT ? OP_LKF : OP_LKP, nonconst.RegNum, op1.RegNum);
op1 = nonconst;
}
if (op1.RegType == REGT_FLOAT) cast = op1.RegCount == 1 ? CAST_F2S : op1.RegCount == 2 ? CAST_V22S : CAST_V32S;
else if (left->ValueType == TypeUInt32) cast = CAST_U2S;
else if (left->ValueType == TypeName) cast = CAST_N2S;
else if (left->ValueType == TypeSound) cast = CAST_So2S;
else if (left->ValueType == TypeColor) cast = CAST_Co2S;
else if (left->ValueType == TypeSpriteID) cast = CAST_SID2S;
else if (left->ValueType == TypeTextureID) cast = CAST_TID2S;
else if (op1.RegType == REGT_POINTER) cast = CAST_P2S;
else if (op1.RegType == REGT_INT) cast = CAST_I2S;
else assert(false && "Bad type for string concatenation");
build->Emit(OP_CAST, strng.RegNum, op1.RegNum, cast);
op1.Free(build);
}
if (op2.RegType == REGT_STRING && op2.Konst)
{
strng2 = ExpEmit(build, REGT_STRING);
build->Emit(OP_LKS, strng2.RegNum, op2.RegNum);
}
else if (op2.RegType == REGT_STRING)
{
strng2 = op2;
}
else
{
int cast;
strng2 = ExpEmit(build, REGT_STRING);
if (op2.Konst)
{
ExpEmit nonconst(build, op2.RegType);
build->Emit(op2.RegType == REGT_INT ? OP_LK : op2.RegType == REGT_FLOAT ? OP_LKF : OP_LKP, nonconst.RegNum, op2.RegNum);
op2 = nonconst;
}
if (op2.RegType == REGT_FLOAT) cast = op2.RegCount == 1 ? CAST_F2S : op2.RegCount == 2 ? CAST_V22S : CAST_V32S;
else if (right->ValueType == TypeUInt32) cast = CAST_U2S;
else if (right->ValueType == TypeName) cast = CAST_N2S;
else if (right->ValueType == TypeSound) cast = CAST_So2S;
else if (right->ValueType == TypeColor) cast = CAST_Co2S;
else if (right->ValueType == TypeSpriteID) cast = CAST_SID2S;
else if (right->ValueType == TypeTextureID) cast = CAST_TID2S;
else if (op2.RegType == REGT_POINTER) cast = CAST_P2S;
else if (op2.RegType == REGT_INT) cast = CAST_I2S;
else assert(false && "Bad type for string concatenation");
build->Emit(OP_CAST, strng2.RegNum, op2.RegNum, cast);
op2.Free(build);
}
strng.Free(build);
strng2.Free(build);
ExpEmit dest(build, REGT_STRING);
assert(strng.RegType == strng2.RegType && strng.RegType == REGT_STRING);
build->Emit(OP_CONCAT, dest.RegNum, strng.RegNum, strng2.RegNum);
return dest;
}
//==========================================================================
//
//
//
//==========================================================================
FxBinaryLogical::FxBinaryLogical(int o, FxExpression *l, FxExpression *r)
: FxExpression(EFX_BinaryLogical, l->ScriptPosition)
{
Operator=o;
left=l;
right=r;
ValueType = TypeBool;
}
//==========================================================================
//
//
//
//==========================================================================
FxBinaryLogical::~FxBinaryLogical()
{
SAFE_DELETE(left);
SAFE_DELETE(right);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxBinaryLogical::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
RESOLVE(left, ctx);
RESOLVE(right, ctx);
ABORT(right && left);
if (left->ValueType != TypeBool)
{
left = new FxBoolCast(left);
SAFE_RESOLVE(left, ctx);
}
if (right->ValueType != TypeBool)
{
right = new FxBoolCast(right);
SAFE_RESOLVE(right, ctx);
}
int b_left=-1, b_right=-1;
if (left->isConstant()) b_left = static_cast<FxConstant *>(left)->GetValue().GetBool();
if (right->isConstant()) b_right = static_cast<FxConstant *>(right)->GetValue().GetBool();
// Do some optimizations. This will throw out all sub-expressions that are not
// needed to retrieve the final result.
if (Operator == TK_AndAnd)
{
if (b_left==0 || b_right==0)
{
FxExpression *x = new FxConstant(true, ScriptPosition);
delete this;
return x;
}
else if (b_left==1 && b_right==1)
{
FxExpression *x = new FxConstant(false, ScriptPosition);
delete this;
return x;
}
else if (b_left==1)
{
FxExpression *x = right;
right=nullptr;
delete this;
return x;
}
else if (b_right==1)
{
FxExpression *x = left;
left=nullptr;
delete this;
return x;
}
}
else if (Operator == TK_OrOr)
{
if (b_left==1 || b_right==1)
{
FxExpression *x = new FxConstant(true, ScriptPosition);
delete this;
return x;
}
if (b_left==0 && b_right==0)
{
FxExpression *x = new FxConstant(false, ScriptPosition);
delete this;
return x;
}
else if (b_left==0)
{
FxExpression *x = right;
right=nullptr;
delete this;
return x;
}
else if (b_right==0)
{
FxExpression *x = left;
left=nullptr;
delete this;
return x;
}
}
Flatten();
return this;
}
//==========================================================================
//
// flatten a list of the same operator into a single node.
//
//==========================================================================
void FxBinaryLogical::Flatten()
{
if (left->ExprType == EFX_BinaryLogical && static_cast<FxBinaryLogical *>(left)->Operator == Operator)
{
list = std::move(static_cast<FxBinaryLogical *>(left)->list);
delete left;
}
else
{
list.Push(left);
}
if (right->ExprType == EFX_BinaryLogical && static_cast<FxBinaryLogical *>(right)->Operator == Operator)
{
auto &rlist = static_cast<FxBinaryLogical *>(right)->list;
auto cnt = rlist.Size();
auto v = list.Reserve(cnt);
for (unsigned i = 0; i < cnt; i++)
{
list[v + i] = rlist[i];
rlist[i] = nullptr;
}
delete right;
}
else
{
list.Push(right);
}
left = right = nullptr;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxBinaryLogical::Emit(VMFunctionBuilder *build)
{
TArray<size_t> patchspots;
int zero = build->GetConstantInt(0);
for (unsigned i = 0; i < list.Size(); i++)
{
assert(list[i]->ValueType->GetRegType() == REGT_INT);
ExpEmit op1 = list[i]->Emit(build);
assert(!op1.Konst);
op1.Free(build);
build->Emit(OP_EQ_K, (Operator == TK_AndAnd) ? 1 : 0, op1.RegNum, zero);
patchspots.Push(build->Emit(OP_JMP, 0, 0, 0));
}
ExpEmit to(build, REGT_INT);
build->Emit(OP_LI, to.RegNum, (Operator == TK_AndAnd) ? 1 : 0);
build->Emit(OP_JMP, 1);
auto ctarget = build->Emit(OP_LI, to.RegNum, (Operator == TK_AndAnd) ? 0 : 1);
for (auto addr : patchspots) build->Backpatch(addr, ctarget);
list.DeleteAndClear();
list.ShrinkToFit();
return to;
}
//==========================================================================
//
//
//
//==========================================================================
FxDotCross::FxDotCross(int o, FxExpression *l, FxExpression *r)
: FxExpression(EFX_DotCross, l->ScriptPosition)
{
Operator = o;
left = l;
right = r;
}
//==========================================================================
//
//
//
//==========================================================================
FxDotCross::~FxDotCross()
{
SAFE_DELETE(left);
SAFE_DELETE(right);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxDotCross::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
RESOLVE(left, ctx);
RESOLVE(right, ctx);
ABORT(right && left);
if (!left->IsVector() || left->ValueType != right->ValueType || (Operator == TK_Cross && left->ValueType != TypeVector3))
{
ScriptPosition.Message(MSG_ERROR, "Incompatible operants for %sproduct", Operator == TK_Cross ? "cross-" : "dot-");
delete this;
return nullptr;
}
ValueType = Operator == TK_Cross ? (PType*)TypeVector3 : TypeFloat64;
return this;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxDotCross::Emit(VMFunctionBuilder *build)
{
ExpEmit to(build, ValueType->GetRegType(), ValueType->GetRegCount());
ExpEmit op1 = left->Emit(build);
ExpEmit op2 = right->Emit(build);
int op = Operator == TK_Cross ? OP_CROSSV_RR : left->ValueType == TypeVector3 ? OP_DOTV3_RR : OP_DOTV2_RR;
build->Emit(op, to.RegNum, op1.RegNum, op2.RegNum);
op1.Free(build);
op2.Free(build);
return to;
}
//==========================================================================
//
//
//
//==========================================================================
FxTypeCheck::FxTypeCheck(FxExpression *l, FxExpression *r)
: FxExpression(EFX_TypeCheck, l->ScriptPosition)
{
left = new FxTypeCast(l, NewPointer(RUNTIME_CLASS(DObject)), false);
right = new FxClassTypeCast(NewClassPointer(RUNTIME_CLASS(DObject)), r);
EmitTail = false;
ValueType = TypeBool;
}
//==========================================================================
//
//
//
//==========================================================================
FxTypeCheck::~FxTypeCheck()
{
SAFE_DELETE(left);
SAFE_DELETE(right);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxTypeCheck::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
RESOLVE(left, ctx);
RESOLVE(right, ctx);
ABORT(right && left);
return this;
}
//==========================================================================
//
//
//
//==========================================================================
PPrototype *FxTypeCheck::ReturnProto()
{
EmitTail = true;
return FxExpression::ReturnProto();
}
//==========================================================================
//
//
//
//==========================================================================
int BuiltinTypeCheck(VMValue *param, TArray<VMValue> &defaultparam, int numparam, VMReturn *ret, int numret)
{
assert(numparam == 2);
PARAM_POINTER_AT(0, obj, DObject);
PARAM_CLASS_AT(1, cls, DObject);
ACTION_RETURN_BOOL(obj && obj->IsKindOf(cls));
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxTypeCheck::Emit(VMFunctionBuilder *build)
{
EmitParameter(build, left, ScriptPosition);
EmitParameter(build, right, ScriptPosition);
PSymbol *sym = FindBuiltinFunction(NAME_BuiltinTypeCheck, BuiltinTypeCheck);
assert(sym->IsKindOf(RUNTIME_CLASS(PSymbolVMFunction)));
assert(((PSymbolVMFunction *)sym)->Function != nullptr);
auto callfunc = ((PSymbolVMFunction *)sym)->Function;
int opcode = (EmitTail ? OP_TAIL_K : OP_CALL_K);
build->Emit(opcode, build->GetConstantAddress(callfunc, ATAG_OBJECT), 2, 1);
if (EmitTail)
{
ExpEmit call;
call.Final = true;
return call;
}
ExpEmit out(build, REGT_INT);
build->Emit(OP_RESULT, 0, REGT_INT, out.RegNum);
return out;
}
//==========================================================================
//
//
//
//==========================================================================
FxDynamicCast::FxDynamicCast(PClass * cls, FxExpression *r)
: FxExpression(EFX_DynamicCast, r->ScriptPosition)
{
expr = r;
CastType = cls;
}
//==========================================================================
//
//
//
//==========================================================================
FxDynamicCast::~FxDynamicCast()
{
SAFE_DELETE(expr);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxDynamicCast::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(expr, ctx);
if (expr->ExprType == EFX_GetDefaultByType)
{
int a = 0;
}
bool constflag = expr->ValueType->IsKindOf(RUNTIME_CLASS(PPointer)) && static_cast<PPointer *>(expr->ValueType)->IsConst;
if (constflag)
{
// readonly pointers are normally only used for class defaults which lack type information to be cast properly, so we have to error out here.
ScriptPosition.Message(MSG_ERROR, "Cannot cast a readonly pointer");
delete this;
return nullptr;
}
expr = new FxTypeCast(expr, NewPointer(RUNTIME_CLASS(DObject), constflag), true, true);
expr = expr->Resolve(ctx);
if (expr == nullptr)
{
delete this;
return nullptr;
}
ValueType = NewPointer(CastType, constflag);
return this;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxDynamicCast::Emit(VMFunctionBuilder *build)
{
ExpEmit in = expr->Emit(build);
ExpEmit out = in.Fixed ? ExpEmit(build, in.RegType) : in;
ExpEmit check(build, REGT_INT);
assert(out.RegType == REGT_POINTER);
if (in.Fixed) build->Emit(OP_MOVEA, out.RegNum, in.RegNum);
build->Emit(OP_PARAM, 0, REGT_POINTER, in.RegNum);
build->Emit(OP_PARAM, 0, REGT_POINTER | REGT_KONST, build->GetConstantAddress(CastType, ATAG_OBJECT));
PSymbol *sym = FindBuiltinFunction(NAME_BuiltinTypeCheck, BuiltinTypeCheck);
assert(sym->IsKindOf(RUNTIME_CLASS(PSymbolVMFunction)));
assert(((PSymbolVMFunction *)sym)->Function != nullptr);
auto callfunc = ((PSymbolVMFunction *)sym)->Function;
build->Emit(OP_CALL_K, build->GetConstantAddress(callfunc, ATAG_OBJECT), 2, 1);
build->Emit(OP_RESULT, 0, REGT_INT, check.RegNum);
build->Emit(OP_EQ_K, 0, check.RegNum, build->GetConstantInt(0));
auto patch = build->Emit(OP_JMP, 0);
build->Emit(OP_LKP, out.RegNum, build->GetConstantAddress(nullptr, ATAG_OBJECT));
build->BackpatchToHere(patch);
return out;
}
//==========================================================================
//
//
//
//==========================================================================
FxConditional::FxConditional(FxExpression *c, FxExpression *t, FxExpression *f)
: FxExpression(EFX_Conditional, c->ScriptPosition)
{
condition = c;
truex=t;
falsex=f;
}
//==========================================================================
//
//
//
//==========================================================================
FxConditional::~FxConditional()
{
SAFE_DELETE(condition);
SAFE_DELETE(truex);
SAFE_DELETE(falsex);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxConditional::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
RESOLVE(condition, ctx);
RESOLVE(truex, ctx);
RESOLVE(falsex, ctx);
ABORT(condition && truex && falsex);
if (truex->ValueType == falsex->ValueType)
ValueType = truex->ValueType;
else if (truex->ValueType == TypeBool && falsex->ValueType == TypeBool)
ValueType = TypeBool;
else if (truex->IsInteger() && falsex->IsInteger())
ValueType = TypeSInt32;
else if (truex->IsNumeric() && falsex->IsNumeric())
ValueType = TypeFloat64;
else if (truex->IsPointer() && falsex->ValueType == TypeNullPtr)
ValueType = truex->ValueType;
else if (falsex->IsPointer() && truex->ValueType == TypeNullPtr)
ValueType = falsex->ValueType;
else
ValueType = TypeVoid;
//else if (truex->ValueType != falsex->ValueType)
if (ValueType->GetRegType() == REGT_NIL)
{
ScriptPosition.Message(MSG_ERROR, "Incompatible types for ?: operator");
delete this;
return nullptr;
}
if (condition->ValueType != TypeBool)
{
condition = new FxBoolCast(condition);
SAFE_RESOLVE(condition, ctx);
}
if (condition->isConstant())
{
ExpVal condval = static_cast<FxConstant *>(condition)->GetValue();
bool result = condval.GetBool();
FxExpression *e = result? truex:falsex;
delete (result? falsex:truex);
falsex = truex = nullptr;
delete this;
return e;
}
if (IsFloat())
{
if (truex->ValueType->GetRegType() != REGT_FLOAT)
{
truex = new FxFloatCast(truex);
RESOLVE(truex, ctx);
}
if (falsex->ValueType->GetRegType() != REGT_FLOAT)
{
falsex = new FxFloatCast(falsex);
RESOLVE(falsex, ctx);
}
}
return this;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxConditional::Emit(VMFunctionBuilder *build)
{
size_t truejump, falsejump;
ExpEmit out;
// The true and false expressions ought to be assigned to the
// same temporary instead of being copied to it. Oh well; good enough
// for now.
ExpEmit cond = condition->Emit(build);
assert(cond.RegType == REGT_INT && !cond.Konst);
// Test condition.
build->Emit(OP_EQ_K, 1, cond.RegNum, build->GetConstantInt(0));
falsejump = build->Emit(OP_JMP, 0);
cond.Free(build);
// Evaluate true expression.
if (truex->isConstant() && truex->ValueType->GetRegType() == REGT_INT)
{
out = ExpEmit(build, REGT_INT);
build->EmitLoadInt(out.RegNum, static_cast<FxConstant *>(truex)->GetValue().GetInt());
}
else
{
ExpEmit trueop = truex->Emit(build);
if (trueop.Konst)
{
trueop.Free(build);
if (trueop.RegType == REGT_FLOAT)
{
out = ExpEmit(build, REGT_FLOAT);
build->Emit(OP_LKF, out.RegNum, trueop.RegNum);
}
else if (trueop.RegType == REGT_POINTER)
{
out = ExpEmit(build, REGT_POINTER);
build->Emit(OP_LKP, out.RegNum, trueop.RegNum);
}
else
{
assert(trueop.RegType == REGT_STRING);
out = ExpEmit(build, REGT_STRING);
build->Emit(OP_LKS, out.RegNum, trueop.RegNum);
}
}
else
{
// Use the register returned by the true condition as the
// target for the false condition.
out = trueop;
}
}
// Make sure to skip the false path.
truejump = build->Emit(OP_JMP, 0);
// Evaluate false expression.
build->BackpatchToHere(falsejump);
if (falsex->isConstant() && falsex->ValueType->GetRegType() == REGT_INT)
{
build->EmitLoadInt(out.RegNum, static_cast<FxConstant *>(falsex)->GetValue().GetInt());
}
else
{
ExpEmit falseop = falsex->Emit(build);
if (falseop.Konst)
{
if (falseop.RegType == REGT_FLOAT)
{
build->Emit(OP_LKF, out.RegNum, falseop.RegNum);
}
else if (falseop.RegType == REGT_POINTER)
{
build->Emit(OP_LKP, out.RegNum, falseop.RegNum);
}
else
{
assert(falseop.RegType == REGT_STRING);
build->Emit(OP_LKS, out.RegNum, falseop.RegNum);
}
falseop.Free(build);
}
else
{
// Move result from the register returned by "false" to the one
// returned by "true" so that only one register is returned by
// this tree.
falseop.Free(build);
build->Emit(falsex->ValueType->GetMoveOp(), out.RegNum, falseop.RegNum, 0);
}
}
build->BackpatchToHere(truejump);
return out;
}
//==========================================================================
//
//
//
//==========================================================================
FxAbs::FxAbs(FxExpression *v)
: FxExpression(EFX_Abs, v->ScriptPosition)
{
val = v;
ValueType = v->ValueType;
}
//==========================================================================
//
//
//
//==========================================================================
FxAbs::~FxAbs()
{
SAFE_DELETE(val);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxAbs::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(val, ctx);
if (!val->IsNumeric())
{
ScriptPosition.Message(MSG_ERROR, "Numeric type expected");
delete this;
return nullptr;
}
else if (val->isConstant())
{
ExpVal value = static_cast<FxConstant *>(val)->GetValue();
switch (value.Type->GetRegType())
{
case REGT_INT:
value.Int = abs(value.Int);
break;
case REGT_FLOAT:
value.Float = fabs(value.Float);
break;
default:
// shouldn't happen
delete this;
return nullptr;
}
FxExpression *x = new FxConstant(value, ScriptPosition);
delete this;
return x;
}
ValueType = val->ValueType;
return this;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxAbs::Emit(VMFunctionBuilder *build)
{
assert(ValueType == val->ValueType);
ExpEmit from = val->Emit(build);
ExpEmit to;
assert(from.Konst == 0);
assert(ValueType->GetRegCount() == 1);
// Do it in-place, unless a local variable
if (from.Fixed)
{
to = ExpEmit(build, from.RegType);
from.Free(build);
}
else
{
to = from;
}
if (ValueType->GetRegType() == REGT_INT)
{
build->Emit(OP_ABS, to.RegNum, from.RegNum, 0);
}
else
{
build->Emit(OP_FLOP, to.RegNum, from.RegNum, FLOP_ABS);
}
return to;
}
//==========================================================================
//
//
//
//==========================================================================
FxATan2::FxATan2(FxExpression *y, FxExpression *x, const FScriptPosition &pos)
: FxExpression(EFX_ATan2, pos)
{
yval = y;
xval = x;
}
//==========================================================================
//
//
//
//==========================================================================
FxATan2::~FxATan2()
{
SAFE_DELETE(yval);
SAFE_DELETE(xval);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxATan2::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(yval, ctx);
SAFE_RESOLVE(xval, ctx);
if (!yval->IsNumeric() || !xval->IsNumeric())
{
ScriptPosition.Message(MSG_ERROR, "numeric value expected for parameter");
delete this;
return nullptr;
}
if (yval->isConstant() && xval->isConstant())
{
double y = static_cast<FxConstant *>(yval)->GetValue().GetFloat();
double x = static_cast<FxConstant *>(xval)->GetValue().GetFloat();
FxExpression *z = new FxConstant(g_atan2(y, x) * (180 / M_PI), ScriptPosition);
delete this;
return z;
}
if (yval->ValueType->GetRegType() != REGT_FLOAT && !yval->isConstant())
{
yval = new FxFloatCast(yval);
}
if (xval->ValueType->GetRegType() != REGT_FLOAT && !xval->isConstant())
{
xval = new FxFloatCast(xval);
}
ValueType = TypeFloat64;
return this;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxATan2::Emit(VMFunctionBuilder *build)
{
ExpEmit yreg = ToReg(build, yval);
ExpEmit xreg = ToReg(build, xval);
yreg.Free(build);
xreg.Free(build);
ExpEmit out(build, REGT_FLOAT);
build->Emit(OP_ATAN2, out.RegNum, yreg.RegNum, xreg.RegNum);
return out;
}
//==========================================================================
//
// The atan2 opcode only takes registers as parameters, so any constants
// must be loaded into registers first.
//
//==========================================================================
ExpEmit FxATan2::ToReg(VMFunctionBuilder *build, FxExpression *val)
{
if (val->isConstant())
{
ExpEmit reg(build, REGT_FLOAT);
build->Emit(OP_LKF, reg.RegNum, build->GetConstantFloat(static_cast<FxConstant*>(val)->GetValue().GetFloat()));
return reg;
}
return val->Emit(build);
}
//==========================================================================
//
//
//
//==========================================================================
FxMinMax::FxMinMax(TArray<FxExpression*> &expr, FName type, const FScriptPosition &pos)
: FxExpression(EFX_MinMax, pos), Type(type)
{
assert(expr.Size() > 0);
assert(type == NAME_Min || type == NAME_Max);
choices.Resize(expr.Size());
for (unsigned i = 0; i < expr.Size(); ++i)
{
choices[i] = expr[i];
expr[i] = nullptr;
}
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxMinMax::Resolve(FCompileContext &ctx)
{
unsigned int i;
int intcount, floatcount;
CHECKRESOLVED();
// Determine if float or int
intcount = floatcount = 0;
for (i = 0; i < choices.Size(); ++i)
{
RESOLVE(choices[i], ctx);
ABORT(choices[i]);
if (choices[i]->IsFloat())
{
floatcount++;
}
else if (choices[i]->IsInteger())
{
intcount++;
}
else
{
ScriptPosition.Message(MSG_ERROR, "Arguments must be of type int or float");
delete this;
return nullptr;
}
}
if (floatcount != 0)
{
ValueType = TypeFloat64;
if (intcount != 0)
{ // There are some ints that need to be cast to floats
for (i = 0; i < choices.Size(); ++i)
{
if (choices[i]->ValueType->GetRegType() == REGT_INT)
{
choices[i] = new FxFloatCast(choices[i]);
RESOLVE(choices[i], ctx);
ABORT(choices[i]);
}
}
}
}
else
{
ValueType = TypeSInt32;
}
// If at least two arguments are constants, they can be solved now.
// Look for first constant
for (i = 0; i < choices.Size(); ++i)
{
if (choices[i]->isConstant())
{
ExpVal best = static_cast<FxConstant *>(choices[i])->GetValue();
// Compare against remaining constants, which are removed.
// The best value gets stored in this one.
for (unsigned j = i + 1; j < choices.Size(); )
{
if (!choices[j]->isConstant())
{
j++;
}
else
{
ExpVal value = static_cast<FxConstant *>(choices[j])->GetValue();
assert(value.Type == ValueType);
if (Type == NAME_Min)
{
if (value.Type->GetRegType() == REGT_FLOAT)
{
if (value.Float < best.Float)
{
best.Float = value.Float;
}
}
else
{
if (value.Int < best.Int)
{
best.Int = value.Int;
}
}
}
else
{
if (value.Type->GetRegType() == REGT_FLOAT)
{
if (value.Float > best.Float)
{
best.Float = value.Float;
}
}
else
{
if (value.Int > best.Int)
{
best.Int = value.Int;
}
}
}
delete choices[j];
choices[j] = nullptr;
choices.Delete(j);
}
}
FxExpression *x = new FxConstant(best, ScriptPosition);
if (i == 0 && choices.Size() == 1)
{ // Every choice was constant
delete this;
return x;
}
delete choices[i];
choices[i] = x;
break;
}
}
return this;
}
//==========================================================================
//
//
//
//==========================================================================
static void EmitLoad(VMFunctionBuilder *build, const ExpEmit resultreg, const ExpVal &value)
{
if (resultreg.RegType == REGT_FLOAT)
{
build->Emit(OP_LKF, resultreg.RegNum, build->GetConstantFloat(value.GetFloat()));
}
else
{
build->EmitLoadInt(resultreg.RegNum, value.GetInt());
}
}
ExpEmit FxMinMax::Emit(VMFunctionBuilder *build)
{
unsigned i;
int opcode;
assert(choices.Size() > 0);
assert(OP_MAXF_RK == OP_MAXF_RR+1);
assert(OP_MAX_RK == OP_MAX_RR+1);
assert(OP_MIN_RK == OP_MIN_RR+1);
assert(OP_MIN_RK == OP_MIN_RR+1);
if (Type == NAME_Min)
{
opcode = ValueType->GetRegType() == REGT_FLOAT ? OP_MINF_RR : OP_MIN_RR;
}
else
{
opcode = ValueType->GetRegType() == REGT_FLOAT ? OP_MAXF_RR : OP_MAX_RR;
}
ExpEmit bestreg;
// Get first value into a register. This will also be the result register.
if (choices[0]->isConstant())
{
bestreg = ExpEmit(build, ValueType->GetRegType());
EmitLoad(build, bestreg, static_cast<FxConstant *>(choices[0])->GetValue());
}
else
{
bestreg = choices[0]->Emit(build);
}
// Compare every choice. Better matches get copied to the bestreg.
for (i = 1; i < choices.Size(); ++i)
{
ExpEmit checkreg = choices[i]->Emit(build);
assert(checkreg.RegType == bestreg.RegType);
build->Emit(opcode + checkreg.Konst, bestreg.RegNum, bestreg.RegNum, checkreg.RegNum);
checkreg.Free(build);
}
return bestreg;
}
//==========================================================================
//
//
//
//==========================================================================
FxRandom::FxRandom(FRandom * r, FxExpression *mi, FxExpression *ma, const FScriptPosition &pos, bool nowarn)
: FxExpression(EFX_Random, pos)
{
EmitTail = false;
if (mi != nullptr && ma != nullptr)
{
min = new FxIntCast(mi, nowarn);
max = new FxIntCast(ma, nowarn);
}
else min = max = nullptr;
rng = r;
ValueType = TypeSInt32;
}
//==========================================================================
//
//
//
//==========================================================================
FxRandom::~FxRandom()
{
SAFE_DELETE(min);
SAFE_DELETE(max);
}
//==========================================================================
//
//
//
//==========================================================================
PPrototype *FxRandom::ReturnProto()
{
EmitTail = true;
return FxExpression::ReturnProto();
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxRandom::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
if (min && max)
{
RESOLVE(min, ctx);
RESOLVE(max, ctx);
ABORT(min && max);
assert(min->ValueType == ValueType);
assert(max->ValueType == ValueType);
}
return this;
};
//==========================================================================
//
//
//
//==========================================================================
int BuiltinRandom(VMValue *param, TArray<VMValue> &defaultparam, int numparam, VMReturn *ret, int numret)
{
assert(numparam >= 1 && numparam <= 3);
FRandom *rng = reinterpret_cast<FRandom *>(param[0].a);
if (numparam == 1)
{
ACTION_RETURN_INT((*rng)());
}
else if (numparam == 2)
{
int maskval = param[1].i;
ACTION_RETURN_INT(rng->Random2(maskval));
}
else if (numparam == 3)
{
int min = param[1].i, max = param[2].i;
if (max < min)
{
swapvalues(max, min);
}
ACTION_RETURN_INT((*rng)(max - min + 1) + min);
}
// Shouldn't happen
return 0;
}
ExpEmit FxRandom::Emit(VMFunctionBuilder *build)
{
// Call DecoRandom to generate a random number.
VMFunction *callfunc;
PSymbol *sym = FindBuiltinFunction(NAME_BuiltinRandom, BuiltinRandom);
assert(sym->IsKindOf(RUNTIME_CLASS(PSymbolVMFunction)));
assert(((PSymbolVMFunction *)sym)->Function != nullptr);
callfunc = ((PSymbolVMFunction *)sym)->Function;
int opcode = (EmitTail ? OP_TAIL_K : OP_CALL_K);
build->Emit(OP_PARAM, 0, REGT_POINTER | REGT_KONST, build->GetConstantAddress(rng, ATAG_RNG));
if (min != nullptr && max != nullptr)
{
EmitParameter(build, min, ScriptPosition);
EmitParameter(build, max, ScriptPosition);
build->Emit(opcode, build->GetConstantAddress(callfunc, ATAG_OBJECT), 3, 1);
}
else
{
build->Emit(opcode, build->GetConstantAddress(callfunc, ATAG_OBJECT), 1, 1);
}
if (EmitTail)
{
ExpEmit call;
call.Final = true;
return call;
}
ExpEmit out(build, REGT_INT);
build->Emit(OP_RESULT, 0, REGT_INT, out.RegNum);
return out;
}
//==========================================================================
//
//
//
//==========================================================================
FxRandomPick::FxRandomPick(FRandom *r, TArray<FxExpression*> &expr, bool floaty, const FScriptPosition &pos, bool nowarn)
: FxExpression(EFX_RandomPick, pos)
{
assert(expr.Size() > 0);
choices.Resize(expr.Size());
for (unsigned int index = 0; index < expr.Size(); index++)
{
if (floaty)
{
choices[index] = new FxFloatCast(expr[index]);
expr[index] = nullptr;
}
else
{
choices[index] = new FxIntCast(expr[index], nowarn);
expr[index] = nullptr;
}
}
rng = r;
if (floaty)
{
ValueType = TypeFloat64;
}
else
{
ValueType = TypeSInt32;
}
}
//==========================================================================
//
//
//
//==========================================================================
FxRandomPick::~FxRandomPick()
{
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxRandomPick::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
for (unsigned int index = 0; index < choices.Size(); index++)
{
RESOLVE(choices[index], ctx);
ABORT(choices[index]);
assert(choices[index]->ValueType == ValueType);
}
return this;
};
//==========================================================================
//
// FxPick :: Emit
//
// The expression:
// a = pick[rng](i_0, i_1, i_2, ..., i_n)
// [where i_x is a complete expression and not just a value]
// is syntactic sugar for:
//
// switch(random[rng](0, n)) {
// case 0: a = i_0;
// case 1: a = i_1;
// case 2: a = i_2;
// ...
// case n: a = i_n;
// }
//
//==========================================================================
ExpEmit FxRandomPick::Emit(VMFunctionBuilder *build)
{
unsigned i;
assert(choices.Size() > 0);
// Call BuiltinRandom to generate a random number.
VMFunction *callfunc;
PSymbol *sym = FindBuiltinFunction(NAME_BuiltinRandom, BuiltinRandom);
assert(sym->IsKindOf(RUNTIME_CLASS(PSymbolVMFunction)));
assert(((PSymbolVMFunction *)sym)->Function != nullptr);
callfunc = ((PSymbolVMFunction *)sym)->Function;
build->Emit(OP_PARAM, 0, REGT_POINTER | REGT_KONST, build->GetConstantAddress(rng, ATAG_RNG));
build->EmitParamInt(0);
build->EmitParamInt(choices.Size() - 1);
build->Emit(OP_CALL_K, build->GetConstantAddress(callfunc, ATAG_OBJECT), 3, 1);
ExpEmit resultreg(build, REGT_INT);
build->Emit(OP_RESULT, 0, REGT_INT, resultreg.RegNum);
build->Emit(OP_IJMP, resultreg.RegNum, 0);
// Free the result register now. The simple code generation algorithm should
// automatically pick it as the destination register for each case.
resultreg.Free(build);
// For floating point results, we need to get a new register, since we can't
// reuse the integer one used to store the random result.
if (ValueType->GetRegType() == REGT_FLOAT)
{
resultreg = ExpEmit(build, REGT_FLOAT);
resultreg.Free(build);
}
// Allocate space for the jump table.
size_t jumptable = build->Emit(OP_JMP, 0);
for (i = 1; i < choices.Size(); ++i)
{
build->Emit(OP_JMP, 0);
}
// Emit each case
TArray<size_t> finishes(choices.Size() - 1);
for (unsigned i = 0; i < choices.Size(); ++i)
{
build->BackpatchToHere(jumptable + i);
if (choices[i]->isConstant())
{
EmitLoad(build, resultreg, static_cast<FxConstant *>(choices[i])->GetValue());
}
else
{
ExpEmit casereg = choices[i]->Emit(build);
if (casereg.RegNum != resultreg.RegNum)
{ // The result of the case is in a different register from what
// was expected. Copy it to the one we wanted.
resultreg.Reuse(build); // This is really just for the assert in Reuse()
build->Emit(ValueType->GetRegType() == REGT_INT ? OP_MOVE : OP_MOVEF, resultreg.RegNum, casereg.RegNum, 0);
resultreg.Free(build);
}
// Free this register so the remaining cases can use it.
casereg.Free(build);
}
// All but the final case needs a jump to the end of the expression's code.
if (i + 1 < choices.Size())
{
size_t loc = build->Emit(OP_JMP, 0);
finishes.Push(loc);
}
}
// Backpatch each case (except the last, since it ends here) to jump to here.
for (i = 0; i < choices.Size() - 1; ++i)
{
build->BackpatchToHere(finishes[i]);
}
// The result register needs to be in-use when we return.
// It should have been freed earlier, so restore its in-use flag.
resultreg.Reuse(build);
choices.DeleteAndClear();
choices.ShrinkToFit();
return resultreg;
}
//==========================================================================
//
//
//
//==========================================================================
FxFRandom::FxFRandom(FRandom *r, FxExpression *mi, FxExpression *ma, const FScriptPosition &pos)
: FxRandom(r, nullptr, nullptr, pos, true)
{
if (mi != nullptr && ma != nullptr)
{
min = new FxFloatCast(mi);
max = new FxFloatCast(ma);
}
ValueType = TypeFloat64;
ExprType = EFX_FRandom;
}
//==========================================================================
//
//
//
//==========================================================================
int BuiltinFRandom(VMValue *param, TArray<VMValue> &defaultparam, int numparam, VMReturn *ret, int numret)
{
assert(numparam == 1 || numparam == 3);
FRandom *rng = reinterpret_cast<FRandom *>(param[0].a);
int random = (*rng)(0x40000000);
double frandom = random / double(0x40000000);
if (numparam == 3)
{
double min = param[1].f, max = param[2].f;
if (max < min)
{
swapvalues(max, min);
}
ACTION_RETURN_FLOAT(frandom * (max - min) + min);
}
else
{
ACTION_RETURN_FLOAT(frandom);
}
}
ExpEmit FxFRandom::Emit(VMFunctionBuilder *build)
{
// Call the BuiltinFRandom function to generate a floating point random number..
VMFunction *callfunc;
PSymbol *sym = FindBuiltinFunction(NAME_BuiltinFRandom, BuiltinFRandom);
assert(sym->IsKindOf(RUNTIME_CLASS(PSymbolVMFunction)));
assert(((PSymbolVMFunction *)sym)->Function != nullptr);
callfunc = ((PSymbolVMFunction *)sym)->Function;
int opcode = (EmitTail ? OP_TAIL_K : OP_CALL_K);
build->Emit(OP_PARAM, 0, REGT_POINTER | REGT_KONST, build->GetConstantAddress(rng, ATAG_RNG));
if (min != nullptr && max != nullptr)
{
EmitParameter(build, min, ScriptPosition);
EmitParameter(build, max, ScriptPosition);
build->Emit(opcode, build->GetConstantAddress(callfunc, ATAG_OBJECT), 3, 1);
}
else
{
build->Emit(opcode, build->GetConstantAddress(callfunc, ATAG_OBJECT), 1, 1);
}
if (EmitTail)
{
ExpEmit call;
call.Final = true;
return call;
}
ExpEmit out(build, REGT_FLOAT);
build->Emit(OP_RESULT, 0, REGT_FLOAT, out.RegNum);
return out;
}
//==========================================================================
//
//
//
//==========================================================================
FxRandom2::FxRandom2(FRandom *r, FxExpression *m, const FScriptPosition &pos, bool nowarn)
: FxExpression(EFX_Random2, pos)
{
EmitTail = false;
rng = r;
if (m) mask = new FxIntCast(m, nowarn);
else mask = new FxConstant(-1, pos);
ValueType = TypeSInt32;
}
//==========================================================================
//
//
//
//==========================================================================
FxRandom2::~FxRandom2()
{
SAFE_DELETE(mask);
}
//==========================================================================
//
//
//
//==========================================================================
PPrototype *FxRandom2::ReturnProto()
{
EmitTail = true;
return FxExpression::ReturnProto();
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxRandom2::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(mask, ctx);
return this;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxRandom2::Emit(VMFunctionBuilder *build)
{
// Call the BuiltinRandom function to generate the random number.
VMFunction *callfunc;
PSymbol *sym = FindBuiltinFunction(NAME_BuiltinRandom, BuiltinRandom);
assert(sym->IsKindOf(RUNTIME_CLASS(PSymbolVMFunction)));
assert(((PSymbolVMFunction *)sym)->Function != nullptr);
callfunc = ((PSymbolVMFunction *)sym)->Function;
int opcode = (EmitTail ? OP_TAIL_K : OP_CALL_K);
build->Emit(OP_PARAM, 0, REGT_POINTER | REGT_KONST, build->GetConstantAddress(rng, ATAG_RNG));
EmitParameter(build, mask, ScriptPosition);
build->Emit(opcode, build->GetConstantAddress(callfunc, ATAG_OBJECT), 2, 1);
if (EmitTail)
{
ExpEmit call;
call.Final = true;
return call;
}
ExpEmit out(build, REGT_INT);
build->Emit(OP_RESULT, 0, REGT_INT, out.RegNum);
return out;
}
//==========================================================================
//
//
//
//==========================================================================
FxIdentifier::FxIdentifier(FName name, const FScriptPosition &pos)
: FxExpression(EFX_Identifier, pos)
{
Identifier = name;
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxIdentifier::Resolve(FCompileContext& ctx)
{
PSymbol * sym;
FxExpression *newex = nullptr;
int num;
CHECKRESOLVED();
// Local variables have highest priority.
FxLocalVariableDeclaration *local = ctx.FindLocalVariable(Identifier);
if (local != nullptr)
{
if (local->ExprType == EFX_StaticArray)
{
auto x = new FxStaticArrayVariable(local, ScriptPosition);
delete this;
return x->Resolve(ctx);
}
else if (local->ValueType->GetRegType() != REGT_NIL)
{
auto x = new FxLocalVariable(local, ScriptPosition);
delete this;
return x->Resolve(ctx);
}
else
{
auto x = new FxStackVariable(local->ValueType, local->StackOffset, ScriptPosition);
delete this;
return x->Resolve(ctx);
}
}
if (Identifier == NAME_Default)
{
if (ctx.Function->Variants[0].SelfClass == nullptr)
{
ScriptPosition.Message(MSG_ERROR, "Unable to access class defaults from static function");
delete this;
return nullptr;
}
if (!ctx.Function->Variants[0].SelfClass->IsKindOf(RUNTIME_CLASS(PClassActor)))
{
ScriptPosition.Message(MSG_ERROR, "'Default' requires an actor type.");
delete this;
return nullptr;
}
FxExpression * x = new FxClassDefaults(new FxSelf(ScriptPosition), ScriptPosition);
delete this;
return x->Resolve(ctx);
}
// Ugh, the horror. Constants need to be taken from the owning class, but members from the self class to catch invalid accesses here...
// see if the current class (if valid) defines something with this name.
PSymbolTable *symtbl;
// first check fields in self
if ((sym = ctx.FindInSelfClass(Identifier, symtbl)) != nullptr)
{
if (sym->IsKindOf(RUNTIME_CLASS(PField)))
{
FxExpression *self = new FxSelf(ScriptPosition);
self = self->Resolve(ctx);
newex = ResolveMember(ctx, ctx.Function->Variants[0].SelfClass, self, ctx.Function->Variants[0].SelfClass);
ABORT(newex);
goto foundit;
}
}
// now check in the owning class.
if (newex == nullptr && (sym = ctx.FindInClass(Identifier, symtbl)) != nullptr)
{
if (sym->IsKindOf(RUNTIME_CLASS(PSymbolConst)))
{
ScriptPosition.Message(MSG_DEBUGLOG, "Resolving name '%s' as class constant\n", Identifier.GetChars());
newex = FxConstant::MakeConstant(sym, ScriptPosition);
goto foundit;
}
// Do this check for ZScript as well, so that a clearer error message can be printed. MSG_OPTERROR will default to MSG_ERROR there.
else if (ctx.Function->Variants[0].SelfClass != ctx.Class && sym->IsKindOf(RUNTIME_CLASS(PField)))
{
FxExpression *self = new FxSelf(ScriptPosition, true);
self = self->Resolve(ctx);
newex = ResolveMember(ctx, ctx.Class, self, ctx.Class);
ABORT(newex);
ScriptPosition.Message(MSG_OPTERROR, "Self pointer used in ambiguous context; VM execution may abort!");
ctx.Unsafe = true;
goto foundit;
}
else
{
if (sym->IsKindOf(RUNTIME_CLASS(PFunction)))
{
ScriptPosition.Message(MSG_ERROR, "Function '%s' used without ().\n", Identifier.GetChars());
}
else
{
ScriptPosition.Message(MSG_ERROR, "Invalid member identifier '%s'.\n", Identifier.GetChars());
}
delete this;
return nullptr;
}
}
if (noglobal)
{
// This is needed to properly resolve class names on the left side of the member access operator
ValueType = TypeError;
return this;
}
// now check the global identifiers.
if (newex == nullptr && (sym = ctx.FindGlobal(Identifier)) != nullptr)
{
if (sym->IsKindOf(RUNTIME_CLASS(PSymbolConst)))
{
ScriptPosition.Message(MSG_DEBUGLOG, "Resolving name '%s' as global constant\n", Identifier.GetChars());
newex = FxConstant::MakeConstant(sym, ScriptPosition);
goto foundit;
}
else if (sym->IsKindOf(RUNTIME_CLASS(PField)))
{
// internally defined global variable
ScriptPosition.Message(MSG_DEBUGLOG, "Resolving name '%s' as global variable\n", Identifier.GetChars());
newex = new FxGlobalVariable(static_cast<PField *>(sym), ScriptPosition);
goto foundit;
}
else
{
ScriptPosition.Message(MSG_ERROR, "Invalid global identifier '%s'\n", Identifier.GetChars());
delete this;
return nullptr;
}
}
// and line specials
if (newex == nullptr && (num = P_FindLineSpecial(Identifier, nullptr, nullptr)))
{
ScriptPosition.Message(MSG_DEBUGLOG, "Resolving name '%s' as line special %d\n", Identifier.GetChars(), num);
newex = new FxConstant(num, ScriptPosition);
goto foundit;
}
if (auto *cvar = FindCVar(Identifier.GetChars(), nullptr))
{
if (cvar->GetFlags() & CVAR_USERINFO)
{
ScriptPosition.Message(MSG_ERROR, "Cannot access userinfo CVARs directly. Use GetCVar() instead.");
delete this;
return nullptr;
}
newex = new FxCVar(cvar, ScriptPosition);
goto foundit;
}
ScriptPosition.Message(MSG_ERROR, "Unknown identifier '%s'", Identifier.GetChars());
delete this;
return nullptr;
foundit:
delete this;
return newex? newex->Resolve(ctx) : nullptr;
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxIdentifier::ResolveMember(FCompileContext &ctx, PStruct *classctx, FxExpression *&object, PStruct *objtype)
{
PSymbol *sym;
PSymbolTable *symtbl;
bool isclass = objtype->IsKindOf(RUNTIME_CLASS(PClass));
if (Identifier == NAME_Default)
{
if (!objtype->IsKindOf(RUNTIME_CLASS(PClassActor)))
{
ScriptPosition.Message(MSG_ERROR, "'Default' requires an actor type.");
delete this;
return nullptr;
}
FxExpression * x = new FxClassDefaults(object, ScriptPosition);
object = nullptr;
delete this;
return x->Resolve(ctx);
}
if ((sym = objtype->Symbols.FindSymbolInTable(Identifier, symtbl)) != nullptr)
{
if (sym->IsKindOf(RUNTIME_CLASS(PSymbolConst)))
{
ScriptPosition.Message(MSG_DEBUGLOG, "Resolving name '%s' as %s constant\n", Identifier.GetChars(), isclass ? "class" : "struct");
delete object;
object = nullptr;
return FxConstant::MakeConstant(sym, ScriptPosition);
}
else if (sym->IsKindOf(RUNTIME_CLASS(PField)))
{
PField *vsym = static_cast<PField*>(sym);
// We have 4 cases to consider here:
// 1. The symbol is a static/meta member (not implemented yet) which is always accessible.
// 2. This is a static function
// 3. This is an action function with a restricted self pointer
// 4. This is a normal member or unrestricted action function.
if (vsym->Flags & VARF_Deprecated && !ctx.FromDecorate)
{
ScriptPosition.Message(MSG_WARNING, "Accessing deprecated member variable %s", vsym->SymbolName.GetChars());
}
if ((vsym->Flags & VARF_Private) && symtbl != &classctx->Symbols)
{
ScriptPosition.Message(MSG_ERROR, "Private member %s not accessible", vsym->SymbolName.GetChars());
return nullptr;
}
auto x = isclass ? new FxClassMember(object, vsym, ScriptPosition) : new FxStructMember(object, vsym, ScriptPosition);
object = nullptr;
return x->Resolve(ctx);
}
else
{
if (sym->IsKindOf(RUNTIME_CLASS(PFunction)))
{
ScriptPosition.Message(MSG_ERROR, "Function '%s' used without ().\n", Identifier.GetChars());
}
else
{
ScriptPosition.Message(MSG_ERROR, "Invalid member identifier '%s'.\n", Identifier.GetChars());
}
delete object;
object = nullptr;
return nullptr;
}
}
else
{
ScriptPosition.Message(MSG_ERROR, "Unknown identifier '%s'", Identifier.GetChars());
delete object;
object = nullptr;
return nullptr;
}
}
//==========================================================================
//
//
//
//==========================================================================
FxMemberIdentifier::FxMemberIdentifier(FxExpression *left, FName name, const FScriptPosition &pos)
: FxIdentifier(name, pos)
{
Object = left;
ExprType = EFX_MemberIdentifier;
}
FxMemberIdentifier::~FxMemberIdentifier()
{
SAFE_DELETE(Object);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxMemberIdentifier::Resolve(FCompileContext& ctx)
{
PStruct *ccls = nullptr;
CHECKRESOLVED();
if (Object->ExprType == EFX_Identifier)
{
// If the left side is a class name for a static member function call it needs to be resolved manually
// because the resulting value type would cause problems in nearly every other place where identifiers are being used.
ccls = FindStructType(static_cast<FxIdentifier *>(Object)->Identifier);
if (ccls != nullptr) static_cast<FxIdentifier *>(Object)->noglobal = true;
}
SAFE_RESOLVE(Object, ctx);
if (Identifier == FName("allmap"))
{
int a = 2;
}
// check for class or struct constants if the left side is a type name.
if (Object->ValueType == TypeError)
{
if (ccls != nullptr)
{
if (!ccls->IsKindOf(RUNTIME_CLASS(PClass)) || static_cast<PClass *>(ccls)->bExported)
{
PSymbol *sym;
if ((sym = ccls->Symbols.FindSymbol(Identifier, true)) != nullptr)
{
if (sym->IsKindOf(RUNTIME_CLASS(PSymbolConst)))
{
ScriptPosition.Message(MSG_DEBUGLOG, "Resolving name '%s.%s' as constant\n", ccls->TypeName.GetChars(), Identifier.GetChars());
delete this;
return FxConstant::MakeConstant(sym, ScriptPosition);
}
else
{
ScriptPosition.Message(MSG_ERROR, "Unable to access '%s.%s' in a static context\n", ccls->TypeName.GetChars(), Identifier.GetChars());
delete this;
return nullptr;
}
}
}
}
}
// allow accessing the color channels by mapping the type to a matching struct which defines them.
if (Object->ValueType == TypeColor)
{
Object->ValueType = TypeColorStruct;
}
else if (Object->ValueType->IsKindOf(RUNTIME_CLASS(PPointer)))
{
auto ptype = static_cast<PPointer *>(Object->ValueType)->PointedType;
if (ptype->IsKindOf(RUNTIME_CLASS(PStruct)))
{
auto ret = ResolveMember(ctx, ctx.Class, Object, static_cast<PStruct *>(ptype));
delete this;
return ret;
}
}
else if (Object->ValueType->IsKindOf(RUNTIME_CLASS(PStruct)))
{
auto ret = ResolveMember(ctx, ctx.Class, Object, static_cast<PStruct *>(Object->ValueType));
delete this;
return ret;
}
ScriptPosition.Message(MSG_ERROR, "Left side of %s is not a struct or class", Identifier.GetChars());
delete this;
return nullptr;
}
//==========================================================================
//
//
//
//==========================================================================
FxLocalVariable::FxLocalVariable(FxLocalVariableDeclaration *var, const FScriptPosition &sc)
: FxExpression(EFX_LocalVariable, sc)
{
Variable = var;
ValueType = var->ValueType;
AddressRequested = false;
RegOffset = 0;
}
FxExpression *FxLocalVariable::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
return this;
}
bool FxLocalVariable::RequestAddress(FCompileContext &ctx, bool *writable)
{
AddressRequested = true;
if (writable != nullptr) *writable = !ctx.CheckReadOnly(Variable->VarFlags);
return true;
}
ExpEmit FxLocalVariable::Emit(VMFunctionBuilder *build)
{
// 'Out' variables are actually pointers but this fact must be hidden to the script.
if (Variable->VarFlags & VARF_Out)
{
if (!AddressRequested)
{
ExpEmit reg(build, ValueType->GetRegType(), ValueType->GetRegCount());
build->Emit(ValueType->GetLoadOp(), reg.RegNum, Variable->RegNum, build->GetConstantInt(RegOffset));
return reg;
}
else
{
if (RegOffset == 0) return ExpEmit(Variable->RegNum, REGT_POINTER, false, true);
ExpEmit reg(build, REGT_POINTER);
build->Emit(OP_ADDA_RK, reg.RegNum, Variable->RegNum, build->GetConstantInt(RegOffset));
return reg;
}
}
else
{
ExpEmit ret(Variable->RegNum + RegOffset, Variable->ValueType->GetRegType(), false, true);
ret.RegCount = ValueType->GetRegCount();
if (AddressRequested) ret.Target = true;
return ret;
}
}
//==========================================================================
//
//
//
//==========================================================================
FxStaticArrayVariable::FxStaticArrayVariable(FxLocalVariableDeclaration *var, const FScriptPosition &sc)
: FxExpression(EFX_StaticArrayVariable, sc)
{
Variable = static_cast<FxStaticArray*>(var);
ValueType = Variable->ValueType;
}
FxExpression *FxStaticArrayVariable::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
return this;
}
bool FxStaticArrayVariable::RequestAddress(FCompileContext &ctx, bool *writable)
{
AddressRequested = true;
if (writable != nullptr) *writable = false;
return true;
}
ExpEmit FxStaticArrayVariable::Emit(VMFunctionBuilder *build)
{
// returns the first const register for this array
return ExpEmit(Variable->StackOffset, Variable->ElementType->GetRegType(), true, false);
}
//==========================================================================
//
//
//
//==========================================================================
FxSelf::FxSelf(const FScriptPosition &pos, bool deccheck)
: FxExpression(EFX_Self, pos)
{
check = deccheck;
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxSelf::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
if (ctx.Function == nullptr || ctx.Function->Variants[0].SelfClass == nullptr)
{
ScriptPosition.Message(MSG_ERROR, "self used outside of a member function");
delete this;
return nullptr;
}
ValueType = NewPointer(ctx.Function->Variants[0].SelfClass);
return this;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxSelf::Emit(VMFunctionBuilder *build)
{
if (check)
{
build->Emit(OP_EQA_R, 1, 0, 1);
build->Emit(OP_JMP, 1);
build->Emit(OP_THROW, 2, X_BAD_SELF);
}
// self is always the first pointer passed to the function
return ExpEmit(0, REGT_POINTER, false, true);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxSuper::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
if (ctx.Function == nullptr || ctx.Function->Variants[0].SelfClass == nullptr)
{
ScriptPosition.Message(MSG_ERROR, "super used outside of a member function");
delete this;
return nullptr;
}
ValueType = TypeError; // this intentionally resolves to an invalid type so that it cannot be used outside of super calls.
return this;
}
//==========================================================================
//
//
//
//==========================================================================
FxClassDefaults::FxClassDefaults(FxExpression *X, const FScriptPosition &pos)
: FxExpression(EFX_ClassDefaults, pos)
{
obj = X;
EmitTail = false;
}
FxClassDefaults::~FxClassDefaults()
{
SAFE_DELETE(obj);
}
//==========================================================================
//
//
//
//==========================================================================
PPrototype *FxClassDefaults::ReturnProto()
{
EmitTail = true;
return FxExpression::ReturnProto();
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxClassDefaults::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(obj, ctx);
assert(obj->ValueType->IsKindOf(RUNTIME_CLASS(PPointer)));
ValueType = NewPointer(static_cast<PPointer*>(obj->ValueType)->PointedType, true);
return this;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxClassDefaults::Emit(VMFunctionBuilder *build)
{
ExpEmit ob = obj->Emit(build);
ob.Free(build);
ExpEmit meta(build, REGT_POINTER);
build->Emit(OP_META, meta.RegNum, ob.RegNum);
build->Emit(OP_LO, meta.RegNum, meta.RegNum, build->GetConstantInt(myoffsetof(PClass, Defaults)));
return meta;
}
//==========================================================================
//
//
//
//==========================================================================
FxGlobalVariable::FxGlobalVariable(PField* mem, const FScriptPosition &pos)
: FxExpression(EFX_GlobalVariable, pos)
{
membervar = mem;
AddressRequested = false;
AddressWritable = true; // must be true unless classx tells us otherwise if requested.
}
//==========================================================================
//
//
//
//==========================================================================
bool FxGlobalVariable::RequestAddress(FCompileContext &ctx, bool *writable)
{
AddressRequested = true;
if (writable != nullptr) *writable = AddressWritable && !ctx.CheckReadOnly(membervar->Flags);
return true;
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxGlobalVariable::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
ValueType = membervar->Type;
return this;
}
ExpEmit FxGlobalVariable::Emit(VMFunctionBuilder *build)
{
ExpEmit obj(build, REGT_POINTER);
build->Emit(OP_LKP, obj.RegNum, build->GetConstantAddress((void*)(intptr_t)membervar->Offset, ATAG_GENERIC));
if (AddressRequested)
{
return obj;
}
ExpEmit loc(build, membervar->Type->GetRegType(), membervar->Type->GetRegCount());
if (membervar->BitValue == -1)
{
int offsetreg = build->GetConstantInt(0);
build->Emit(membervar->Type->GetLoadOp(), loc.RegNum, obj.RegNum, offsetreg);
}
else
{
build->Emit(OP_LBIT, loc.RegNum, obj.RegNum, 1 << membervar->BitValue);
}
obj.Free(build);
return loc;
}
//==========================================================================
//
//
//
//==========================================================================
FxCVar::FxCVar(FBaseCVar *cvar, const FScriptPosition &pos)
: FxExpression(EFX_CVar, pos)
{
CVar = cvar;
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxCVar::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
switch (CVar->GetRealType())
{
case CVAR_Bool:
case CVAR_DummyBool:
ValueType = TypeBool;
break;
case CVAR_Int:
case CVAR_DummyInt:
ValueType = TypeSInt32;
break;
case CVAR_Color:
ValueType = TypeColor;
break;
case CVAR_Float:
ValueType = TypeFloat64;
break;
case CVAR_String:
ValueType = TypeString;
break;
default:
ScriptPosition.Message(MSG_ERROR, "Unknown CVar type for %s", CVar->GetName());
delete this;
return nullptr;
}
return this;
}
ExpEmit FxCVar::Emit(VMFunctionBuilder *build)
{
ExpEmit dest(build, ValueType->GetRegType());
ExpEmit addr(build, REGT_POINTER);
int nul = build->GetConstantInt(0);
switch (CVar->GetRealType())
{
case CVAR_Int:
build->Emit(OP_LKP, addr.RegNum, build->GetConstantAddress(&static_cast<FIntCVar *>(CVar)->Value, ATAG_GENERIC));
build->Emit(OP_LW, dest.RegNum, addr.RegNum, nul);
break;
case CVAR_Color:
build->Emit(OP_LKP, addr.RegNum, build->GetConstantAddress(&static_cast<FColorCVar *>(CVar)->Value, ATAG_GENERIC));
build->Emit(OP_LW, dest.RegNum, addr.RegNum, nul);
break;
case CVAR_Float:
build->Emit(OP_LKP, addr.RegNum, build->GetConstantAddress(&static_cast<FFloatCVar *>(CVar)->Value, ATAG_GENERIC));
build->Emit(OP_LSP, dest.RegNum, addr.RegNum, nul);
break;
case CVAR_Bool:
build->Emit(OP_LKP, addr.RegNum, build->GetConstantAddress(&static_cast<FBoolCVar *>(CVar)->Value, ATAG_GENERIC));
build->Emit(OP_LBU, dest.RegNum, addr.RegNum, nul);
break;
case CVAR_String:
build->Emit(OP_LKP, addr.RegNum, build->GetConstantAddress(&static_cast<FStringCVar *>(CVar)->Value, ATAG_GENERIC));
build->Emit(OP_LS, dest.RegNum, addr.RegNum, nul);
break;
case CVAR_DummyBool:
{
auto cv = static_cast<FFlagCVar *>(CVar);
build->Emit(OP_LKP, addr.RegNum, build->GetConstantAddress(&cv->ValueVar.Value, ATAG_GENERIC));
build->Emit(OP_LW, dest.RegNum, addr.RegNum, nul);
build->Emit(OP_SRL_RI, dest.RegNum, dest.RegNum, cv->BitNum);
build->Emit(OP_AND_RK, dest.RegNum, dest.RegNum, build->GetConstantInt(1));
break;
}
case CVAR_DummyInt:
{
auto cv = static_cast<FMaskCVar *>(CVar);
build->Emit(OP_LKP, addr.RegNum, build->GetConstantAddress(&cv->ValueVar.Value, ATAG_GENERIC));
build->Emit(OP_LW, dest.RegNum, addr.RegNum, nul);
build->Emit(OP_AND_RK, dest.RegNum, dest.RegNum, build->GetConstantInt(cv->BitVal));
build->Emit(OP_SRL_RI, dest.RegNum, dest.RegNum, cv->BitNum);
break;
}
default:
assert(false && "Unsupported CVar type");
break;
}
addr.Free(build);
return dest;
}
//==========================================================================
//
//
//
//==========================================================================
FxStackVariable::FxStackVariable(PType *type, int offset, const FScriptPosition &pos)
: FxExpression(EFX_StackVariable, pos)
{
membervar = new PField(NAME_None, type, 0, offset);
AddressRequested = false;
AddressWritable = true; // must be true unless classx tells us otherwise if requested.
}
//==========================================================================
//
// force delete the PField because we know we won't need it anymore
// and it won't get GC'd until the compiler finishes.
//
//==========================================================================
FxStackVariable::~FxStackVariable()
{
// Q: Is this good or bad? Needs testing if this is fine or better left to the GC anyway. DObject's destructor is anything but cheap.
membervar->ObjectFlags |= OF_YesReallyDelete;
delete membervar;
}
//==========================================================================
//
//
//==========================================================================
void FxStackVariable::ReplaceField(PField *newfield)
{
membervar->ObjectFlags |= OF_YesReallyDelete;
delete membervar;
membervar = newfield;
}
//==========================================================================
//
//
//
//==========================================================================
bool FxStackVariable::RequestAddress(FCompileContext &ctx, bool *writable)
{
AddressRequested = true;
if (writable != nullptr) *writable = AddressWritable && !ctx.CheckReadOnly(membervar->Flags);
return true;
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxStackVariable::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
ValueType = membervar->Type;
return this;
}
ExpEmit FxStackVariable::Emit(VMFunctionBuilder *build)
{
int offsetreg = -1;
if (membervar->Offset != 0) offsetreg = build->GetConstantInt((int)membervar->Offset);
if (AddressRequested)
{
if (offsetreg >= 0)
{
ExpEmit obj(build, REGT_POINTER);
build->Emit(OP_ADDA_RK, obj.RegNum, build->FramePointer.RegNum, offsetreg);
return obj;
}
else
{
return build->FramePointer;
}
}
ExpEmit loc(build, membervar->Type->GetRegType(), membervar->Type->GetRegCount());
if (membervar->BitValue == -1)
{
if (offsetreg == -1) offsetreg = build->GetConstantInt(0);
build->Emit(membervar->Type->GetLoadOp(), loc.RegNum, build->FramePointer.RegNum, offsetreg);
}
else
{
ExpEmit obj(build, REGT_POINTER);
if (offsetreg >= 0) build->Emit(OP_ADDA_RK, obj.RegNum, build->FramePointer.RegNum, offsetreg);
obj.Free(build);
build->Emit(OP_LBIT, loc.RegNum, obj.RegNum, 1 << membervar->BitValue);
}
return loc;
}
//==========================================================================
//
//
//
//==========================================================================
FxStructMember::FxStructMember(FxExpression *x, PField* mem, const FScriptPosition &pos)
: FxExpression(EFX_StructMember, pos)
{
classx = x;
membervar = mem;
AddressRequested = false;
AddressWritable = true; // must be true unless classx tells us otherwise if requested.
}
//==========================================================================
//
//
//
//==========================================================================
FxStructMember::~FxStructMember()
{
SAFE_DELETE(classx);
}
//==========================================================================
//
//
//
//==========================================================================
bool FxStructMember::RequestAddress(FCompileContext &ctx, bool *writable)
{
// Cannot take the address of metadata variables.
if (membervar->Flags & VARF_Static)
{
return false;
}
AddressRequested = true;
if (writable != nullptr) *writable = (AddressWritable && !ctx.CheckReadOnly(membervar->Flags) &&
(!classx->ValueType->IsKindOf(RUNTIME_CLASS(PPointer)) || !static_cast<PPointer*>(classx->ValueType)->IsConst));
return true;
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxStructMember::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(classx, ctx);
if (membervar->SymbolName == NAME_Default)
{
if (!classx->ValueType->IsKindOf(RUNTIME_CLASS(PPointer))
|| !static_cast<PPointer *>(classx->ValueType)->PointedType->IsKindOf(RUNTIME_CLASS(AActor)))
{
ScriptPosition.Message(MSG_ERROR, "'Default' requires an actor type.");
delete this;
return nullptr;
}
FxExpression * x = new FxClassDefaults(classx, ScriptPosition);
classx = nullptr;
delete this;
return x->Resolve(ctx);
}
if (classx->ValueType->IsKindOf(RUNTIME_CLASS(PPointer)))
{
PPointer *ptrtype = dyn_cast<PPointer>(classx->ValueType);
if (ptrtype == nullptr || !ptrtype->PointedType->IsKindOf(RUNTIME_CLASS(PStruct)))
{
ScriptPosition.Message(MSG_ERROR, "Member variable requires a struct or class object.");
delete this;
return nullptr;
}
}
else if (classx->ValueType->IsKindOf(RUNTIME_CLASS(PStruct)))
{
// if this is a struct within a class or another struct we can simplify the expression by creating a new PField with a cumulative offset.
if (classx->ExprType == EFX_ClassMember || classx->ExprType == EFX_StructMember)
{
auto parentfield = static_cast<FxStructMember *>(classx)->membervar;
// PFields are garbage collected so this will be automatically taken care of later.
auto newfield = new PField(membervar->SymbolName, membervar->Type, membervar->Flags | parentfield->Flags, membervar->Offset + parentfield->Offset);
newfield->BitValue = membervar->BitValue;
static_cast<FxStructMember *>(classx)->membervar = newfield;
classx->isresolved = false; // re-resolve the parent so it can also check if it can be optimized away.
auto x = classx->Resolve(ctx);
classx = nullptr;
return x;
}
else if (classx->ExprType == EFX_GlobalVariable)
{
auto parentfield = static_cast<FxGlobalVariable *>(classx)->membervar;
auto newfield = new PField(membervar->SymbolName, membervar->Type, membervar->Flags | parentfield->Flags, membervar->Offset + parentfield->Offset);
newfield->BitValue = membervar->BitValue;
static_cast<FxGlobalVariable *>(classx)->membervar = newfield;
classx->isresolved = false; // re-resolve the parent so it can also check if it can be optimized away.
auto x = classx->Resolve(ctx);
classx = nullptr;
return x;
}
else if (classx->ExprType == EFX_StackVariable)
{
auto parentfield = static_cast<FxStackVariable *>(classx)->membervar;
auto newfield = new PField(membervar->SymbolName, membervar->Type, membervar->Flags | parentfield->Flags, membervar->Offset + parentfield->Offset);
newfield->BitValue = membervar->BitValue;
static_cast<FxStackVariable *>(classx)->ReplaceField(newfield);
classx->isresolved = false; // re-resolve the parent so it can also check if it can be optimized away.
auto x = classx->Resolve(ctx);
classx = nullptr;
return x;
}
else if (classx->ExprType == EFX_LocalVariable && classx->IsVector()) // vectors are a special case because they are held in registers
{
// since this is a vector, all potential things that may get here are single float or an xy-vector.
auto locvar = static_cast<FxLocalVariable *>(classx);
locvar->RegOffset = int(membervar->Offset / 8);
locvar->ValueType = membervar->Type;
classx = nullptr;
delete this;
return locvar;
}
else if (classx->ExprType == EFX_LocalVariable && classx->ValueType == TypeColorStruct)
{
// This needs special treatment because it'd require accessing the register via address.
// Fortunately this is the only place where this kind of access is ever needed so an explicit handling is acceptable.
int bits;
switch (membervar->SymbolName.GetIndex())
{
case NAME_a: bits = 24; break;
case NAME_r: bits = 16; break;
case NAME_g: bits = 8; break;
case NAME_b: default: bits = 0; break;
}
classx->ValueType = TypeColor; // need to set it back.
FxExpression *x = classx;
if (bits > 0) x = new FxShift(TK_URShift, x, new FxConstant(bits, ScriptPosition));
x = new FxBitOp('&', x, new FxConstant(255, ScriptPosition));
classx = nullptr;
delete this;
return x->Resolve(ctx);
}
else
{
if (!(classx->RequestAddress(ctx, &AddressWritable)))
{
ScriptPosition.Message(MSG_ERROR, "unable to dereference left side of %s", membervar->SymbolName.GetChars());
delete this;
return nullptr;
}
}
}
ValueType = membervar->Type;
return this;
}
ExpEmit FxStructMember::Emit(VMFunctionBuilder *build)
{
ExpEmit obj = classx->Emit(build);
assert(obj.RegType == REGT_POINTER);
if (obj.Konst)
{
// If the situation where we are dereferencing a constant
// pointer is common, then it would probably be worthwhile
// to add new opcodes for those. But as of right now, I
// don't expect it to be a particularly common case.
ExpEmit newobj(build, REGT_POINTER);
build->Emit(OP_LKP, newobj.RegNum, obj.RegNum);
obj = newobj;
}
if (membervar->Flags & VARF_Static)
{
obj.Free(build);
ExpEmit meta(build, REGT_POINTER);
build->Emit(OP_META, meta.RegNum, obj.RegNum);
obj = meta;
}
if (AddressRequested)
{
if (membervar->Offset == 0)
{
return obj;
}
obj.Free(build);
ExpEmit out(build, REGT_POINTER);
build->Emit(OP_ADDA_RK, out.RegNum, obj.RegNum, build->GetConstantInt((int)membervar->Offset));
return out;
}
int offsetreg = build->GetConstantInt((int)membervar->Offset);
ExpEmit loc(build, membervar->Type->GetRegType(), membervar->Type->GetRegCount());
if (membervar->BitValue == -1)
{
build->Emit(membervar->Type->GetLoadOp(), loc.RegNum, obj.RegNum, offsetreg);
}
else
{
ExpEmit out(build, REGT_POINTER);
build->Emit(OP_ADDA_RK, out.RegNum, obj.RegNum, offsetreg);
build->Emit(OP_LBIT, loc.RegNum, out.RegNum, 1 << membervar->BitValue);
out.Free(build);
}
obj.Free(build);
return loc;
}
//==========================================================================
//
// not really needed at the moment but may become useful with meta properties
// and some other class-specific extensions.
//
//==========================================================================
FxClassMember::FxClassMember(FxExpression *x, PField* mem, const FScriptPosition &pos)
: FxStructMember(x, mem, pos)
{
ExprType = EFX_ClassMember;
}
//==========================================================================
//
//
//
//==========================================================================
FxArrayElement::FxArrayElement(FxExpression *base, FxExpression *_index)
:FxExpression(EFX_ArrayElement, base->ScriptPosition)
{
Array=base;
index = _index;
AddressRequested = false;
AddressWritable = false;
}
//==========================================================================
//
//
//
//==========================================================================
FxArrayElement::~FxArrayElement()
{
SAFE_DELETE(Array);
SAFE_DELETE(index);
}
//==========================================================================
//
//
//
//==========================================================================
bool FxArrayElement::RequestAddress(FCompileContext &ctx, bool *writable)
{
AddressRequested = true;
if (writable != nullptr) *writable = AddressWritable;
return true;
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxArrayElement::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(Array,ctx);
SAFE_RESOLVE(index,ctx);
if (index->ValueType->GetRegType() == REGT_FLOAT /* lax */)
{
// DECORATE allows floats here so cast them to int.
index = new FxIntCast(index, ctx.FromDecorate);
index = index->Resolve(ctx);
if (index == nullptr)
{
delete this;
return nullptr;
}
}
if (!index->IsInteger())
{
ScriptPosition.Message(MSG_ERROR, "Array index must be integer");
delete this;
return nullptr;
}
PArray *arraytype = dyn_cast<PArray>(Array->ValueType);
if (arraytype == nullptr)
{
// Check if we got a pointer to an array. Some native data structures (like the line list in sectors) use this.
PPointer *ptype = dyn_cast<PPointer>(Array->ValueType);
if (ptype == nullptr || !ptype->PointedType->IsKindOf(RUNTIME_CLASS(PArray)))
{
ScriptPosition.Message(MSG_ERROR, "'[]' can only be used with arrays.");
delete this;
return nullptr;
}
arraytype = static_cast<PArray*>(ptype->PointedType);
arrayispointer = true;
}
if (index->isConstant())
{
unsigned indexval = static_cast<FxConstant *>(index)->GetValue().GetInt();
if (indexval >= arraytype->ElementCount)
{
ScriptPosition.Message(MSG_ERROR, "Array index out of bounds");
delete this;
return nullptr;
}
if (!arrayispointer)
{
// if this is an array within a class or another struct we can simplify the expression by creating a new PField with a cumulative offset.
if (Array->ExprType == EFX_ClassMember || Array->ExprType == EFX_StructMember)
{
auto parentfield = static_cast<FxStructMember *>(Array)->membervar;
// PFields are garbage collected so this will be automatically taken care of later.
auto newfield = new PField(NAME_None, arraytype->ElementType, parentfield->Flags, indexval * arraytype->ElementSize + parentfield->Offset);
static_cast<FxStructMember *>(Array)->membervar = newfield;
Array->isresolved = false; // re-resolve the parent so it can also check if it can be optimized away.
auto x = Array->Resolve(ctx);
Array = nullptr;
return x;
}
else if (Array->ExprType == EFX_GlobalVariable)
{
auto parentfield = static_cast<FxGlobalVariable *>(Array)->membervar;
auto newfield = new PField(NAME_None, arraytype->ElementType, parentfield->Flags, indexval * arraytype->ElementSize + parentfield->Offset);
static_cast<FxGlobalVariable *>(Array)->membervar = newfield;
Array->isresolved = false; // re-resolve the parent so it can also check if it can be optimized away.
auto x = Array->Resolve(ctx);
Array = nullptr;
return x;
}
else if (Array->ExprType == EFX_StackVariable)
{
auto parentfield = static_cast<FxStackVariable *>(Array)->membervar;
auto newfield = new PField(NAME_None, arraytype->ElementType, parentfield->Flags, indexval * arraytype->ElementSize + parentfield->Offset);
static_cast<FxStackVariable *>(Array)->ReplaceField(newfield);
Array->isresolved = false; // re-resolve the parent so it can also check if it can be optimized away.
auto x = Array->Resolve(ctx);
Array = nullptr;
return x;
}
}
}
ValueType = arraytype->ElementType;
if (!Array->RequestAddress(ctx, &AddressWritable))
{
ScriptPosition.Message(MSG_ERROR, "Unable to dereference array.");
delete this;
return nullptr;
}
return this;
}
//==========================================================================
//
// in its current state this won't be able to do more than handle the args array.
//
//==========================================================================
ExpEmit FxArrayElement::Emit(VMFunctionBuilder *build)
{
PArray *arraytype;
if (arrayispointer)
{
arraytype = static_cast<PArray*>(static_cast<PPointer*>(Array->ValueType)->PointedType);
}
else
{
arraytype = static_cast<PArray*>(Array->ValueType);
}
ExpEmit start = Array->Emit(build);
/* what was this for?
if (start.Konst)
{
ExpEmit tmpstart(build, REGT_POINTER);
build->Emit(OP_LKP, tmpstart.RegNum, start.RegNum);
start.Free(build);
start = tmpstart;
}
*/
if (index->isConstant())
{
unsigned indexval = static_cast<FxConstant *>(index)->GetValue().GetInt();
assert(indexval < arraytype->ElementCount && "Array index out of bounds");
if (AddressRequested)
{
if (indexval != 0)
{
indexval *= arraytype->ElementSize;
if (!start.Fixed)
{
build->Emit(OP_ADDA_RK, start.RegNum, start.RegNum, build->GetConstantInt(indexval));
}
else
{
// do not clobber local variables.
ExpEmit temp(build, start.RegType);
build->Emit(OP_ADDA_RK, temp.RegNum, start.RegNum, build->GetConstantInt(indexval));
start.Free(build);
start = temp;
}
}
return start;
}
else if (!start.Konst)
{
start.Free(build);
ExpEmit dest(build, ValueType->GetRegType());
build->Emit(arraytype->ElementType->GetLoadOp(), dest.RegNum, start.RegNum, build->GetConstantInt(indexval* arraytype->ElementSize));
return dest;
}
else
{
static int LK_Ops[] = { OP_LK, OP_LKF, OP_LKS, OP_LKP };
assert(start.RegType == ValueType->GetRegType());
ExpEmit dest(build, start.RegType);
build->Emit(LK_Ops[start.RegType], dest.RegNum, start.RegNum + indexval);
return dest;
}
}
else
{
ExpEmit indexv(index->Emit(build));
// Todo: For dynamically allocated arrays (like global sector and linedef tables) we need to get the bound value in here somehow.
// Right now their bounds are not properly checked for.
if (arraytype->ElementCount > 65535)
{
build->Emit(OP_BOUND_K, indexv.RegNum, build->GetConstantInt(arraytype->ElementCount));
}
else
{
build->Emit(OP_BOUND, indexv.RegNum, arraytype->ElementCount);
}
if (!start.Konst)
{
int shiftbits = 0;
while (1u << shiftbits < arraytype->ElementSize)
{
shiftbits++;
}
ExpEmit indexwork = indexv.Fixed && arraytype->ElementSize > 1 ? ExpEmit(build, indexv.RegType) : indexv;
if (1u << shiftbits == arraytype->ElementSize)
{
if (shiftbits > 0)
{
build->Emit(OP_SLL_RI, indexwork.RegNum, indexv.RegNum, shiftbits);
}
}
else
{
// A shift won't do, so use a multiplication
build->Emit(OP_MUL_RK, indexwork.RegNum, indexv.RegNum, build->GetConstantInt(arraytype->ElementSize));
}
indexwork.Free(build);
if (AddressRequested)
{
if (!start.Fixed)
{
build->Emit(OP_ADDA_RR, start.RegNum, start.RegNum, indexwork.RegNum);
}
else
{
start.Free(build);
// do not clobber local variables.
ExpEmit temp(build, start.RegType);
build->Emit(OP_ADDA_RR, temp.RegNum, start.RegNum, indexwork.RegNum);
start = temp;
}
return start;
}
else
{
start.Free(build);
ExpEmit dest(build, ValueType->GetRegType());
// added 1 to use the *_R version that takes the offset from a register
build->Emit(arraytype->ElementType->GetLoadOp() + 1, dest.RegNum, start.RegNum, indexwork.RegNum);
return dest;
}
}
else
{
static int LKR_Ops[] = { OP_LK_R, OP_LKF_R, OP_LKS_R, OP_LKP_R };
assert(start.RegType == ValueType->GetRegType());
ExpEmit dest(build, start.RegType);
if (start.RegNum <= 255)
{
// Since large constant tables are the exception, the constant component in C is an immediate value here.
build->Emit(LKR_Ops[start.RegType], dest.RegNum, indexv.RegNum, start.RegNum);
}
else
{
build->Emit(OP_ADD_RK, indexv.RegNum, indexv.RegNum, build->GetConstantInt(start.RegNum));
build->Emit(LKR_Ops[start.RegType], dest.RegNum, indexv.RegNum, 0);
}
indexv.Free(build);
return dest;
}
}
}
//==========================================================================
//
// Checks if a function may be called from the current context.
//
//==========================================================================
static bool CheckFunctionCompatiblity(FScriptPosition &ScriptPosition, PFunction *caller, PFunction *callee)
{
if (callee->Variants[0].Flags & VARF_Method)
{
// The called function must support all usage modes of the current function. It may support more, but must not support less.
if ((callee->Variants[0].UseFlags & caller->Variants[0].UseFlags) != caller->Variants[0].UseFlags)
{
ScriptPosition.Message(MSG_ERROR, "Function %s incompatible with current context\n", callee->SymbolName.GetChars());
return false;
}
if (!(caller->Variants[0].Flags & VARF_Method))
{
ScriptPosition.Message(MSG_ERROR, "Call to non-static function %s from a static context", callee->SymbolName.GetChars());
return false;
}
else
{
auto callingself = caller->Variants[0].SelfClass;
auto calledself = callee->Variants[0].SelfClass;
bool match = (callingself == calledself);
if (!match)
{
auto callingselfcls = dyn_cast<PClass>(caller->Variants[0].SelfClass);
auto calledselfcls = dyn_cast<PClass>(callee->Variants[0].SelfClass);
match = callingselfcls != nullptr && calledselfcls != nullptr && callingselfcls->IsDescendantOf(calledselfcls);
}
if (!match)
{
ScriptPosition.Message(MSG_ERROR, "Call to member function %s with incompatible self pointer.", callee->SymbolName.GetChars());
return false;
}
}
}
return true;
}
//==========================================================================
//
//
//
//==========================================================================
FxFunctionCall::FxFunctionCall(FName methodname, FName rngname, FArgumentList &args, const FScriptPosition &pos)
: FxExpression(EFX_FunctionCall, pos)
{
MethodName = methodname;
RNG = &pr_exrandom;
ArgList = std::move(args);
if (rngname != NAME_None)
{
switch (MethodName)
{
case NAME_Random:
case NAME_FRandom:
case NAME_RandomPick:
case NAME_FRandomPick:
case NAME_Random2:
RNG = FRandom::StaticFindRNG(rngname.GetChars());
break;
default:
pos.Message(MSG_ERROR, "Cannot use named RNGs with %s", MethodName.GetChars());
break;
}
}
}
//==========================================================================
//
//
//
//==========================================================================
FxFunctionCall::~FxFunctionCall()
{
}
//==========================================================================
//
// Check function that gets called
//
//==========================================================================
static bool CheckArgSize(FName fname, FArgumentList &args, int min, int max, FScriptPosition &sc)
{
int s = args.Size();
if (s < min)
{
sc.Message(MSG_ERROR, "Insufficient arguments in call to %s, expected %d, got %d", fname.GetChars(), min, s);
return false;
}
else if (s > max && max >= 0)
{
sc.Message(MSG_ERROR, "Too many arguments in call to %s, expected %d, got %d", fname.GetChars(), min, s);
return false;
}
return true;
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxFunctionCall::Resolve(FCompileContext& ctx)
{
ABORT(ctx.Class);
bool error = false;
for (auto a : ArgList)
{
if (a == nullptr)
{
ScriptPosition.Message(MSG_ERROR, "Empty function argument.");
delete this;
return nullptr;
}
}
PFunction *afd = FindClassMemberFunction(ctx.Class, ctx.Class, MethodName, ScriptPosition, &error);
if (afd != nullptr)
{
if (!CheckFunctionCompatiblity(ScriptPosition, ctx.Function, afd))
{
delete this;
return nullptr;
}
auto self = (afd->Variants[0].Flags & VARF_Method)? new FxSelf(ScriptPosition) : nullptr;
auto x = new FxVMFunctionCall(self, afd, ArgList, ScriptPosition, false);
delete this;
return x->Resolve(ctx);
}
for (size_t i = 0; i < countof(FxFlops); ++i)
{
if (MethodName == FxFlops[i].Name)
{
FxExpression *x = new FxFlopFunctionCall(i, ArgList, ScriptPosition);
delete this;
return x->Resolve(ctx);
}
}
int min, max, special;
if (MethodName == NAME_ACS_NamedExecuteWithResult || MethodName == NAME_CallACS)
{
special = -ACS_ExecuteWithResult;
min = 1;
max = 5;
}
else
{
special = P_FindLineSpecial(MethodName.GetChars(), &min, &max);
}
if (special != 0 && min >= 0)
{
int paramcount = ArgList.Size();
if (paramcount < min)
{
ScriptPosition.Message(MSG_ERROR, "Not enough parameters for '%s' (expected %d, got %d)",
MethodName.GetChars(), min, paramcount);
delete this;
return nullptr;
}
else if (paramcount > max)
{
ScriptPosition.Message(MSG_ERROR, "too many parameters for '%s' (expected %d, got %d)",
MethodName.GetChars(), max, paramcount);
delete this;
return nullptr;
}
FxExpression *self = (ctx.Function && ctx.Function->Variants[0].Flags & VARF_Method) ? new FxSelf(ScriptPosition) : nullptr;
FxExpression *x = new FxActionSpecialCall(self, special, ArgList, ScriptPosition);
delete this;
return x->Resolve(ctx);
}
PClass *cls = PClass::FindClass(MethodName);
if (cls != nullptr && cls->bExported)
{
if (CheckArgSize(MethodName, ArgList, 1, 1, ScriptPosition))
{
FxExpression *x = new FxDynamicCast(cls, ArgList[0]);
ArgList[0] = nullptr;
delete this;
return x->Resolve(ctx);
}
else
{
delete this;
return nullptr;
}
}
// Last but not least: Check builtins and type casts. The random functions can take a named RNG if specified.
// Note that for all builtins the used arguments have to be nulled in the ArgList so that they won't get deleted before they get used.
FxExpression *func = nullptr;
switch (MethodName)
{
case NAME_Color:
if (ArgList.Size() == 3 || ArgList.Size() == 4)
{
func = new FxColorLiteral(ArgList, ScriptPosition);
break;
}
// fall through
case NAME_Bool:
case NAME_Int:
case NAME_uInt:
case NAME_Float:
case NAME_Double:
case NAME_Name:
case NAME_Sound:
case NAME_State:
case NAME_SpriteID:
case NAME_TextureID:
if (CheckArgSize(MethodName, ArgList, 1, 1, ScriptPosition))
{
PType *type =
MethodName == NAME_Bool ? TypeBool :
MethodName == NAME_Int ? TypeSInt32 :
MethodName == NAME_uInt ? TypeUInt32 :
MethodName == NAME_Float ? TypeFloat64 :
MethodName == NAME_Double ? TypeFloat64 :
MethodName == NAME_Name ? TypeName :
MethodName == NAME_SpriteID ? TypeSpriteID :
MethodName == NAME_TextureID ? TypeTextureID :
MethodName == NAME_State ? TypeState :
MethodName == NAME_Color ? TypeColor : (PType*)TypeSound;
func = new FxTypeCast(ArgList[0], type, true, true);
ArgList[0] = nullptr;
}
break;
case NAME_GetClass:
if (CheckArgSize(NAME_GetClass, ArgList, 0, 0, ScriptPosition))
{
func = new FxGetClass(new FxSelf(ScriptPosition));
}
break;
case NAME_GetDefaultByType:
if (CheckArgSize(NAME_GetDefaultByType, ArgList, 1, 1, ScriptPosition))
{
func = new FxGetDefaultByType(ArgList[0]);
ArgList[0] = nullptr;
}
break;
case NAME_Random:
// allow calling Random without arguments to default to (0, 255)
if (ArgList.Size() == 0)
{
func = new FxRandom(RNG, new FxConstant(0, ScriptPosition), new FxConstant(255, ScriptPosition), ScriptPosition, ctx.FromDecorate);
}
else if (CheckArgSize(NAME_Random, ArgList, 2, 2, ScriptPosition))
{
func = new FxRandom(RNG, ArgList[0], ArgList[1], ScriptPosition, ctx.FromDecorate);
ArgList[0] = ArgList[1] = nullptr;
}
break;
case NAME_FRandom:
if (CheckArgSize(NAME_FRandom, ArgList, 2, 2, ScriptPosition))
{
func = new FxFRandom(RNG, ArgList[0], ArgList[1], ScriptPosition);
ArgList[0] = ArgList[1] = nullptr;
}
break;
case NAME_RandomPick:
case NAME_FRandomPick:
if (CheckArgSize(MethodName, ArgList, 1, -1, ScriptPosition))
{
func = new FxRandomPick(RNG, ArgList, MethodName == NAME_FRandomPick, ScriptPosition, ctx.FromDecorate);
}
break;
case NAME_Random2:
if (CheckArgSize(NAME_Random2, ArgList, 0, 1, ScriptPosition))
{
func = new FxRandom2(RNG, ArgList.Size() == 0? nullptr : ArgList[0], ScriptPosition, ctx.FromDecorate);
if (ArgList.Size() > 0) ArgList[0] = nullptr;
}
break;
case NAME_Min:
case NAME_Max:
if (CheckArgSize(MethodName, ArgList, 2, -1, ScriptPosition))
{
func = new FxMinMax(ArgList, MethodName, ScriptPosition);
}
break;
case NAME_Clamp:
if (CheckArgSize(MethodName, ArgList, 3, 3, ScriptPosition))
{
TArray<FxExpression *> pass;
pass.Resize(2);
pass[0] = ArgList[0];
pass[1] = ArgList[1];
pass[0] = new FxMinMax(pass, NAME_Max, ScriptPosition);
pass[1] = ArgList[2];
func = new FxMinMax(pass, NAME_Min, ScriptPosition);
ArgList[0] = ArgList[1] = ArgList[2] = nullptr;
}
break;
case NAME_Abs:
if (CheckArgSize(MethodName, ArgList, 1, 1, ScriptPosition))
{
func = new FxAbs(ArgList[0]);
ArgList[0] = nullptr;
}
break;
case NAME_ATan2:
case NAME_VectorAngle:
if (CheckArgSize(MethodName, ArgList, 2, 2, ScriptPosition))
{
func = MethodName == NAME_ATan2 ? new FxATan2(ArgList[0], ArgList[1], ScriptPosition) : new FxATan2(ArgList[1], ArgList[0], ScriptPosition);
ArgList[0] = ArgList[1] = nullptr;
}
break;
default:
ScriptPosition.Message(MSG_ERROR, "Call to unknown function '%s'", MethodName.GetChars());
break;
}
if (func != nullptr)
{
delete this;
return func->Resolve(ctx);
}
delete this;
return nullptr;
}
//==========================================================================
//
//
//
//==========================================================================
FxMemberFunctionCall::FxMemberFunctionCall(FxExpression *self, FName methodname, FArgumentList &args, const FScriptPosition &pos)
: FxExpression(EFX_MemberFunctionCall, pos)
{
Self = self;
MethodName = methodname;
ArgList = std::move(args);
}
//==========================================================================
//
//
//
//==========================================================================
FxMemberFunctionCall::~FxMemberFunctionCall()
{
SAFE_DELETE(Self);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxMemberFunctionCall::Resolve(FCompileContext& ctx)
{
ABORT(ctx.Class);
PStruct *cls;
bool staticonly = false;
bool novirtual = false;
PStruct *ccls = nullptr;
for (auto a : ArgList)
{
if (a == nullptr)
{
ScriptPosition.Message(MSG_ERROR, "Empty function argument.");
delete this;
return nullptr;
}
}
if (Self->ExprType == EFX_Identifier)
{
// If the left side is a class name for a static member function call it needs to be resolved manually
// because the resulting value type would cause problems in nearly every other place where identifiers are being used.
ccls = FindStructType(static_cast<FxIdentifier *>(Self)->Identifier);
if (ccls != nullptr) static_cast<FxIdentifier *>(Self)->noglobal = true;
}
SAFE_RESOLVE(Self, ctx);
if (Self->ValueType == TypeError)
{
if (ccls != nullptr)
{
if (!ccls->IsKindOf(RUNTIME_CLASS(PClass)) || static_cast<PClass *>(ccls)->bExported)
{
cls = ccls;
staticonly = true;
goto isresolved;
}
}
}
if (Self->ExprType == EFX_Super)
{
auto clstype = dyn_cast<PClass>(ctx.Function->Variants[0].SelfClass);
if (clstype != nullptr)
{
// give the node the proper value type now that we know it's properly used.
cls = clstype->ParentClass;
Self->ValueType = NewPointer(cls);
Self->ExprType = EFX_Self;
novirtual = true; // super calls are always non-virtual
}
else
{
ScriptPosition.Message(MSG_ERROR, "Super requires a class type");
}
}
// Note: These builtins would better be relegated to the actual type objects, instead of polluting this file, but that's a task for later.
// Texture builtins.
if (Self->ValueType == TypeTextureID)
{
if (MethodName == NAME_IsValid || MethodName == NAME_IsNull || MethodName == NAME_Exists || MethodName == NAME_SetInvalid || MethodName == NAME_SetNull)
{
if (ArgList.Size() > 0)
{
ScriptPosition.Message(MSG_ERROR, "too many parameters in call to %s", MethodName.GetChars());
delete this;
return nullptr;
}
// No need to create a dedicated node here, all builtins map directly to trivial operations.
Self->ValueType = TypeSInt32; // all builtins treat the texture index as integer.
FxExpression *x;
switch (MethodName)
{
case NAME_IsValid:
x = new FxCompareRel('>', Self, new FxConstant(0, ScriptPosition));
break;
case NAME_IsNull:
x = new FxCompareEq(TK_Eq, Self, new FxConstant(0, ScriptPosition));
break;
case NAME_Exists:
x = new FxCompareRel(TK_Geq, Self, new FxConstant(0, ScriptPosition));
break;
case NAME_SetInvalid:
x = new FxAssign(Self, new FxConstant(-1, ScriptPosition));
break;
case NAME_SetNull:
x = new FxAssign(Self, new FxConstant(0, ScriptPosition));
break;
}
Self = nullptr;
SAFE_RESOLVE(x, ctx);
if (MethodName == NAME_SetInvalid || MethodName == NAME_SetNull) x->ValueType = TypeVoid; // override the default type of the assignment operator.
delete this;
return x;
}
}
if (Self->IsVector())
{
// handle builtins: Vectors got 2: Length and Unit.
if (MethodName == NAME_Length || MethodName == NAME_Unit)
{
if (ArgList.Size() > 0)
{
ScriptPosition.Message(MSG_ERROR, "too many parameters in call to %s", MethodName.GetChars());
delete this;
return nullptr;
}
auto x = new FxVectorBuiltin(Self, MethodName);
Self = nullptr;
delete this;
return x->Resolve(ctx);
}
}
if (Self->ValueType == TypeString)
{
// same for String methods. It also uses a hidden struct type to define them.
Self->ValueType = TypeStringStruct;
}
if (Self->ValueType->IsKindOf(RUNTIME_CLASS(PPointer)))
{
auto ptype = static_cast<PPointer *>(Self->ValueType)->PointedType;
if (ptype->IsKindOf(RUNTIME_CLASS(PStruct)))
{
if (ptype->IsKindOf(RUNTIME_CLASS(PClass)) && MethodName == NAME_GetClass)
{
if (ArgList.Size() > 0)
{
ScriptPosition.Message(MSG_ERROR, "too many parameters in call to %s", MethodName.GetChars());
delete this;
return nullptr;
}
auto x = new FxGetClass(Self);
return x->Resolve(ctx);
}
cls = static_cast<PStruct *>(ptype);
}
else
{
ScriptPosition.Message(MSG_ERROR, "Left hand side of %s must point to a class object\n", MethodName.GetChars());
delete this;
return nullptr;
}
}
else if (Self->ValueType->IsKindOf(RUNTIME_CLASS(PStruct)))
{
bool writable;
if (Self->RequestAddress(ctx, &writable) && writable)
{
cls = static_cast<PStruct*>(Self->ValueType);
Self->ValueType = NewPointer(Self->ValueType);
}
else
{
// Cannot be made writable so we cannot use its methods.
ScriptPosition.Message(MSG_ERROR, "Invalid expression on left hand side of %s\n", MethodName.GetChars());
delete this;
return nullptr;
}
}
else
{
ScriptPosition.Message(MSG_ERROR, "Invalid expression on left hand side of %s\n", MethodName.GetChars());
delete this;
return nullptr;
}
// Todo: handle member calls from instantiated structs.
isresolved:
bool error = false;
PFunction *afd = FindClassMemberFunction(cls, ctx.Class, MethodName, ScriptPosition, &error);
if (error)
{
delete this;
return nullptr;
}
if (afd == nullptr)
{
ScriptPosition.Message(MSG_ERROR, "Unknown function %s\n", MethodName.GetChars());
delete this;
return nullptr;
}
if (staticonly && (afd->Variants[0].Flags & VARF_Method))
{
auto clstype = dyn_cast<PClass>(ctx.Class);
auto ccls = dyn_cast<PClass>(cls);
if (clstype == nullptr || ccls == nullptr || !clstype->IsDescendantOf(ccls))
{
ScriptPosition.Message(MSG_ERROR, "Cannot call non-static function %s::%s from here\n", cls->TypeName.GetChars(), MethodName.GetChars());
delete this;
return nullptr;
}
else
{
// Todo: If this is a qualified call to a parent class function, let it through (but this needs to disable virtual calls later.)
ScriptPosition.Message(MSG_ERROR, "Qualified member call to parent class not yet implemented\n", cls->TypeName.GetChars(), MethodName.GetChars());
delete this;
return nullptr;
}
}
if (afd->Variants[0].Flags & VARF_Method)
{
if (Self->ExprType == EFX_Self)
{
if (!CheckFunctionCompatiblity(ScriptPosition, ctx.Function, afd))
{
delete this;
return nullptr;
}
}
else
{
// Functions with no Actor usage may not be called through a pointer because they will lose their context.
if (!(afd->Variants[0].UseFlags & SUF_ACTOR))
{
ScriptPosition.Message(MSG_ERROR, "Function %s cannot be used with a non-self object\n", afd->SymbolName.GetChars());
delete this;
return nullptr;
}
}
}
// do not pass the self pointer to static functions.
auto self = (afd->Variants[0].Flags & VARF_Method) ? Self : nullptr;
auto x = new FxVMFunctionCall(self, afd, ArgList, ScriptPosition, staticonly|novirtual);
if (Self == self) Self = nullptr;
delete this;
return x->Resolve(ctx);
}
//==========================================================================
//
// FxActionSpecialCall
//
// If special is negative, then the first argument will be treated as a
// name for ACS_NamedExecuteWithResult.
//
//==========================================================================
FxActionSpecialCall::FxActionSpecialCall(FxExpression *self, int special, FArgumentList &args, const FScriptPosition &pos)
: FxExpression(EFX_ActionSpecialCall, pos)
{
Self = self;
Special = special;
ArgList = std::move(args);
EmitTail = false;
}
//==========================================================================
//
//
//
//==========================================================================
FxActionSpecialCall::~FxActionSpecialCall()
{
SAFE_DELETE(Self);
}
//==========================================================================
//
//
//
//==========================================================================
PPrototype *FxActionSpecialCall::ReturnProto()
{
EmitTail = true;
return FxExpression::ReturnProto();
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxActionSpecialCall::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
bool failed = false;
SAFE_RESOLVE_OPT(Self, ctx);
for (unsigned i = 0; i < ArgList.Size(); i++)
{
ArgList[i] = ArgList[i]->Resolve(ctx);
if (ArgList[i] == nullptr)
{
failed = true;
}
else if (Special < 0 && i == 0)
{
if (ArgList[i]->ValueType == TypeString)
{
ArgList[i] = new FxNameCast(ArgList[i]);
ArgList[i] = ArgList[i]->Resolve(ctx);
if (ArgList[i] == nullptr)
{
failed = true;
}
}
else if (ArgList[i]->ValueType != TypeName)
{
ScriptPosition.Message(MSG_ERROR, "Name expected for parameter %d", i);
failed = true;
}
}
else if (!ArgList[i]->IsInteger())
{
if (ArgList[i]->ValueType->GetRegType() == REGT_FLOAT /* lax */)
{
ArgList[i] = new FxIntCast(ArgList[i], ctx.FromDecorate);
}
else
{
ScriptPosition.Message(MSG_ERROR, "Integer expected for parameter %d", i);
failed = true;
}
}
}
if (failed)
{
delete this;
return nullptr;
}
ValueType = TypeSInt32;
return this;
}
//==========================================================================
//
//
//
//==========================================================================
int BuiltinCallLineSpecial(VMValue *param, TArray<VMValue> &defaultparam, int numparam, VMReturn *ret, int numret)
{
assert(numparam > 2 && numparam < 8);
assert(param[0].Type == REGT_INT);
assert(param[1].Type == REGT_POINTER);
int v[5] = { 0 };
for (int i = 2; i < numparam; ++i)
{
v[i - 2] = param[i].i;
}
ACTION_RETURN_INT(P_ExecuteSpecial(param[0].i, nullptr, reinterpret_cast<AActor*>(param[1].a), false, v[0], v[1], v[2], v[3], v[4]));
}
ExpEmit FxActionSpecialCall::Emit(VMFunctionBuilder *build)
{
unsigned i = 0;
build->Emit(OP_PARAMI, abs(Special)); // pass special number
// fixme: This really should use the Self pointer that got passed to this class instead of just using the first argument from the function.
// Once static functions are possible, or specials can be called through a member access operator this won't work anymore.
build->Emit(OP_PARAM, 0, REGT_POINTER, 0); // pass self
for (; i < ArgList.Size(); ++i)
{
FxExpression *argex = ArgList[i];
if (Special < 0 && i == 0)
{
assert(argex->ValueType == TypeName);
assert(argex->isConstant());
build->EmitParamInt(-static_cast<FxConstant *>(argex)->GetValue().GetName());
}
else
{
assert(argex->ValueType->GetRegType() == REGT_INT);
if (argex->isConstant())
{
build->EmitParamInt(static_cast<FxConstant *>(argex)->GetValue().GetInt());
}
else
{
ExpEmit arg(argex->Emit(build));
build->Emit(OP_PARAM, 0, arg.RegType, arg.RegNum);
arg.Free(build);
}
}
}
// Call the BuiltinCallLineSpecial function to perform the desired special.
VMFunction *callfunc;
PSymbol *sym = FindBuiltinFunction(NAME_BuiltinCallLineSpecial, BuiltinCallLineSpecial);
assert(sym->IsKindOf(RUNTIME_CLASS(PSymbolVMFunction)));
assert(((PSymbolVMFunction *)sym)->Function != nullptr);
callfunc = ((PSymbolVMFunction *)sym)->Function;
ArgList.DeleteAndClear();
ArgList.ShrinkToFit();
if (EmitTail)
{
build->Emit(OP_TAIL_K, build->GetConstantAddress(callfunc, ATAG_OBJECT), 2 + i, 0);
ExpEmit call;
call.Final = true;
return call;
}
ExpEmit dest(build, REGT_INT);
build->Emit(OP_CALL_K, build->GetConstantAddress(callfunc, ATAG_OBJECT), 2 + i, 1);
build->Emit(OP_RESULT, 0, REGT_INT, dest.RegNum);
return dest;
}
//==========================================================================
//
// FxVMFunctionCall
//
//==========================================================================
FxVMFunctionCall::FxVMFunctionCall(FxExpression *self, PFunction *func, FArgumentList &args, const FScriptPosition &pos, bool novirtual)
: FxExpression(EFX_VMFunctionCall, pos)
{
Self = self;
Function = func;
ArgList = std::move(args);
EmitTail = false;
NoVirtual = novirtual;
}
//==========================================================================
//
//
//
//==========================================================================
FxVMFunctionCall::~FxVMFunctionCall()
{
}
//==========================================================================
//
//
//
//==========================================================================
PPrototype *FxVMFunctionCall::ReturnProto()
{
EmitTail = true;
return Function->Variants[0].Proto;
}
//==========================================================================
//
//
//
//==========================================================================
VMFunction *FxVMFunctionCall::GetDirectFunction()
{
// If this return statement calls a non-virtual function with no arguments,
// then it can be a "direct" function. That is, the DECORATE
// definition can call that function directly without wrapping
// it inside VM code.
if (ArgList.Size() == 0 && !(Function->Variants[0].Flags & VARF_Virtual))
{
unsigned imp = Function->GetImplicitArgs();
if (Function->Variants[0].ArgFlags.Size() > imp && !(Function->Variants[0].ArgFlags[imp] & VARF_Optional)) return nullptr;
return Function->Variants[0].Implementation;
}
return nullptr;
}
//==========================================================================
//
// FxVMFunctionCall :: Resolve
//
//==========================================================================
FxExpression *FxVMFunctionCall::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE_OPT(Self, ctx);
bool failed = false;
auto proto = Function->Variants[0].Proto;
auto &argtypes = proto->ArgumentTypes;
auto &argnames = Function->Variants[0].ArgNames;
auto &argflags = Function->Variants[0].ArgFlags;
auto &defaults = Function->Variants[0].Implementation->DefaultArgs;
int implicit = Function->GetImplicitArgs();
// This should never happen.
if (Self == nullptr && (Function->Variants[0].Flags & VARF_Method))
{
ScriptPosition.Message(MSG_ERROR, "Call to non-static function without a self pointer");
delete this;
return nullptr;
}
if (ArgList.Size() > 0)
{
bool foundvarargs = false;
PType * type = nullptr;
int flag = 0;
if (argtypes.Last() != nullptr && ArgList.Size() + implicit > argtypes.Size())
{
ScriptPosition.Message(MSG_ERROR, "Too many arguments in call to %s", Function->SymbolName.GetChars());
delete this;
return nullptr;
}
for (unsigned i = 0; i < ArgList.Size(); i++)
{
// Varargs must all have the same type as the last typed argument. A_Jump is the only function using it.
if (!foundvarargs)
{
if (argtypes[i + implicit] == nullptr) foundvarargs = true;
else
{
type = argtypes[i + implicit];
flag = argflags[i + implicit];
}
}
assert(type != nullptr);
if (ArgList[i]->ExprType == EFX_NamedNode)
{
if (!(flag & VARF_Optional))
{
ScriptPosition.Message(MSG_ERROR, "Cannot use a named argument here - not all required arguments have been passed.");
delete this;
return nullptr;
}
if (foundvarargs)
{
ScriptPosition.Message(MSG_ERROR, "Cannot use a named argument in the varargs part of the parameter list.");
delete this;
return nullptr;
}
unsigned j;
bool done = false;
FName name = static_cast<FxNamedNode *>(ArgList[i])->name;
for (j = 0; j < argnames.Size() - implicit; j++)
{
if (argnames[j + implicit] == name)
{
if (j < i)
{
ScriptPosition.Message(MSG_ERROR, "Named argument %s comes before current position in argument list.", name.GetChars());
delete this;
return nullptr;
}
// copy the original argument into the list
auto old = static_cast<FxNamedNode *>(ArgList[i]);
ArgList[i] = old->value;
old->value = nullptr;
delete old;
// now fill the gap with constants created from the default list so that we got a full list of arguments.
int insert = j - i;
for (int k = 0; k < insert; k++)
{
auto ntype = argtypes[i + k + implicit];
// If this is a reference argument, the pointer type must be undone because the code below expects the pointed type as value type.
if (argflags[i + k + implicit] & VARF_Ref)
{
assert(ntype->IsKindOf(RUNTIME_CLASS(PPointer)));
ntype = TypeNullPtr; // the default of a reference type can only be a null pointer
}
auto x = new FxConstant(ntype, defaults[i + k + implicit], ScriptPosition);
ArgList.Insert(i + k, x);
}
done = true;
break;
}
}
if (!done)
{
ScriptPosition.Message(MSG_ERROR, "Named argument %s not found.", name.GetChars());
delete this;
return nullptr;
}
// re-get the proper info for the inserted node.
type = argtypes[i + implicit];
flag = argflags[i + implicit];
}
FxExpression *x;
if (!(flag & (VARF_Ref|VARF_Out)))
{
x = new FxTypeCast(ArgList[i], type, false);
x = x->Resolve(ctx);
}
else
{
bool writable;
ArgList[i] = ArgList[i]->Resolve(ctx); // nust be resolved before the address is requested.
if (ArgList[i] != nullptr && ArgList[i]->ValueType != TypeNullPtr)
{
ArgList[i]->RequestAddress(ctx, &writable);
if (flag & VARF_Ref) ArgList[i]->ValueType = NewPointer(ArgList[i]->ValueType);
// For a reference argument the types must match 100%.
if (type != ArgList[i]->ValueType)
{
ScriptPosition.Message(MSG_ERROR, "Type mismatch in reference argument", Function->SymbolName.GetChars());
x = nullptr;
}
else
{
x = ArgList[i];
}
}
else x = ArgList[i];
}
failed |= (x == nullptr);
ArgList[i] = x;
}
int numargs = ArgList.Size() + implicit;
if ((unsigned)numargs < argtypes.Size() && argtypes[numargs] != nullptr)
{
auto flags = Function->Variants[0].ArgFlags[numargs];
if (!(flags & VARF_Optional))
{
ScriptPosition.Message(MSG_ERROR, "Insufficient arguments in call to %s", Function->SymbolName.GetChars());
delete this;
return nullptr;
}
}
}
else
{
if ((unsigned)implicit < argtypes.Size() && argtypes[implicit] != nullptr)
{
auto flags = Function->Variants[0].ArgFlags[implicit];
if (!(flags & VARF_Optional))
{
ScriptPosition.Message(MSG_ERROR, "Insufficient arguments in call to %s", Function->SymbolName.GetChars());
delete this;
return nullptr;
}
}
}
if (failed)
{
delete this;
return nullptr;
}
TArray<PType *> &rets = proto->ReturnTypes;
if (rets.Size() > 0)
{
ValueType = rets[0];
}
else
{
ValueType = TypeVoid;
}
return this;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxVMFunctionCall::Emit(VMFunctionBuilder *build)
{
assert(build->Registers[REGT_POINTER].GetMostUsed() >= build->NumImplicits);
int count = 0;
if (count == 1)
{
ExpEmit reg;
if (CheckEmitCast(build, EmitTail, reg))
{
ArgList.DeleteAndClear();
ArgList.ShrinkToFit();
return reg;
}
}
VMFunction *vmfunc = Function->Variants[0].Implementation;
bool staticcall = (vmfunc->Final || vmfunc->VirtualIndex == ~0u || NoVirtual);
count = 0;
// Emit code to pass implied parameters
ExpEmit selfemit;
if (Function->Variants[0].Flags & VARF_Method)
{
assert(Self != nullptr);
selfemit = Self->Emit(build);
assert((selfemit.RegType == REGT_POINTER) || (selfemit.Fixed && selfemit.Target));
if (selfemit.Fixed && selfemit.Target)
{
// Address of a local variable.
build->Emit(OP_PARAM, 0, selfemit.RegType | REGT_ADDROF, selfemit.RegNum);
}
else
{
build->Emit(OP_PARAM, 0, selfemit.RegType, selfemit.RegNum);
}
count += 1;
if (Function->Variants[0].Flags & VARF_Action)
{
static_assert(NAP == 3, "This code needs to be updated if NAP changes");
if (build->NumImplicits == NAP && selfemit.RegNum == 0) // only pass this function's stateowner and stateinfo if the subfunction is run in self's context.
{
build->Emit(OP_PARAM, 0, REGT_POINTER, 1);
build->Emit(OP_PARAM, 0, REGT_POINTER, 2);
}
else
{
// pass self as stateowner, otherwise all attempts of the subfunction to retrieve a state from a name would fail.
build->Emit(OP_PARAM, 0, selfemit.RegType, selfemit.RegNum);
build->Emit(OP_PARAM, 0, REGT_POINTER | REGT_KONST, build->GetConstantAddress(nullptr, ATAG_GENERIC));
}
count += 2;
}
if (staticcall) selfemit.Free(build);
}
else staticcall = true;
// Emit code to pass explicit parameters
for (unsigned i = 0; i < ArgList.Size(); ++i)
{
count += EmitParameter(build, ArgList[i], ScriptPosition);
}
ArgList.DeleteAndClear();
ArgList.ShrinkToFit();
// Get a constant register for this function
if (staticcall)
{
int funcaddr = build->GetConstantAddress(vmfunc, ATAG_OBJECT);
// Emit the call
if (EmitTail)
{ // Tail call
build->Emit(OP_TAIL_K, funcaddr, count, 0);
ExpEmit call;
call.Final = true;
return call;
}
else if (vmfunc->Proto->ReturnTypes.Size() > 0)
{ // Call, expecting one result
build->Emit(OP_CALL_K, funcaddr, count, MAX(1, AssignCount));
goto handlereturns;
}
else
{ // Call, expecting no results
build->Emit(OP_CALL_K, funcaddr, count, 0);
return ExpEmit();
}
}
else
{
selfemit.Free(build);
ExpEmit funcreg(build, REGT_POINTER);
build->Emit(OP_VTBL, funcreg.RegNum, selfemit.RegNum, vmfunc->VirtualIndex);
if (EmitTail)
{ // Tail call
build->Emit(OP_TAIL, funcreg.RegNum, count, 0);
ExpEmit call;
call.Final = true;
return call;
}
else if (vmfunc->Proto->ReturnTypes.Size() > 0)
{ // Call, expecting one result
build->Emit(OP_CALL, funcreg.RegNum, count, MAX(1, AssignCount));
goto handlereturns;
}
else
{ // Call, expecting no results
build->Emit(OP_CALL, funcreg.RegNum, count, 0);
return ExpEmit();
}
}
handlereturns:
if (AssignCount == 0)
{
// Regular call, will not write to ReturnRegs
ExpEmit reg(build, vmfunc->Proto->ReturnTypes[0]->GetRegType(), vmfunc->Proto->ReturnTypes[0]->GetRegCount());
build->Emit(OP_RESULT, 0, EncodeRegType(reg), reg.RegNum);
return reg;
}
else
{
// Multi-Assignment call, this must fill in the ReturnRegs array so that the multi-assignment operator can dispatch the return values.
assert((unsigned)AssignCount <= vmfunc->Proto->ReturnTypes.Size());
for (int i = 0; i < AssignCount; i++)
{
ExpEmit reg(build, vmfunc->Proto->ReturnTypes[i]->GetRegType(), vmfunc->Proto->ReturnTypes[i]->GetRegCount());
build->Emit(OP_RESULT, 0, EncodeRegType(reg), reg.RegNum);
ReturnRegs.Push(reg);
}
return ExpEmit();
}
}
//==========================================================================
//
// If calling one of the casting kludge functions, don't bother calling the
// function; just use the parameter directly. Returns true if this was a
// kludge function, false otherwise.
//
//==========================================================================
bool FxVMFunctionCall::CheckEmitCast(VMFunctionBuilder *build, bool returnit, ExpEmit &reg)
{
FName funcname = Function->SymbolName;
if (funcname == NAME___decorate_internal_int__ ||
funcname == NAME___decorate_internal_bool__ ||
funcname == NAME___decorate_internal_float__)
{
FxExpression *arg = ArgList[0];
if (returnit)
{
if (arg->isConstant() &&
(funcname == NAME___decorate_internal_int__ ||
funcname == NAME___decorate_internal_bool__))
{ // Use immediate version for integers in range
build->EmitRetInt(0, true, static_cast<FxConstant *>(arg)->GetValue().Int);
}
else
{
ExpEmit where = arg->Emit(build);
build->Emit(OP_RET, RET_FINAL, EncodeRegType(where), where.RegNum);
where.Free(build);
}
reg = ExpEmit();
reg.Final = true;
}
else
{
reg = arg->Emit(build);
}
return true;
}
return false;
}
//==========================================================================
//
//
//
//==========================================================================
FxFlopFunctionCall::FxFlopFunctionCall(size_t index, FArgumentList &args, const FScriptPosition &pos)
: FxExpression(EFX_FlopFunctionCall, pos)
{
assert(index < countof(FxFlops) && "FLOP index out of range");
Index = (int)index;
ArgList = std::move(args);
}
//==========================================================================
//
//
//
//==========================================================================
FxFlopFunctionCall::~FxFlopFunctionCall()
{
}
FxExpression *FxFlopFunctionCall::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
if (ArgList.Size() != 1)
{
ScriptPosition.Message(MSG_ERROR, "%s only has one parameter", FName(FxFlops[Index].Name).GetChars());
delete this;
return nullptr;
}
ArgList[0] = ArgList[0]->Resolve(ctx);
if (ArgList[0] == nullptr)
{
delete this;
return nullptr;
}
if (!ArgList[0]->IsNumeric())
{
ScriptPosition.Message(MSG_ERROR, "numeric value expected for parameter");
delete this;
return nullptr;
}
if (ArgList[0]->isConstant())
{
double v = static_cast<FxConstant *>(ArgList[0])->GetValue().GetFloat();
v = FxFlops[Index].Evaluate(v);
FxExpression *x = new FxConstant(v, ScriptPosition);
delete this;
return x;
}
if (ArgList[0]->ValueType->GetRegType() == REGT_INT)
{
ArgList[0] = new FxFloatCast(ArgList[0]);
}
ValueType = TypeFloat64;
return this;
}
//==========================================================================
//
//
//==========================================================================
ExpEmit FxFlopFunctionCall::Emit(VMFunctionBuilder *build)
{
assert(ValueType == ArgList[0]->ValueType);
ExpEmit from = ArgList[0]->Emit(build);
ExpEmit to;
assert(from.Konst == 0);
assert(ValueType->GetRegCount() == 1);
// Do it in-place, unless a local variable
if (from.Fixed)
{
to = ExpEmit(build, from.RegType);
from.Free(build);
}
else
{
to = from;
}
build->Emit(OP_FLOP, to.RegNum, from.RegNum, FxFlops[Index].Flop);
ArgList.DeleteAndClear();
ArgList.ShrinkToFit();
return to;
}
//==========================================================================
//
//
//==========================================================================
FxVectorBuiltin::FxVectorBuiltin(FxExpression *self, FName name)
:FxExpression(EFX_VectorBuiltin, self->ScriptPosition)
{
Self = self;
Function = name;
}
FxVectorBuiltin::~FxVectorBuiltin()
{
SAFE_DELETE(Self);
}
FxExpression *FxVectorBuiltin::Resolve(FCompileContext &ctx)
{
SAFE_RESOLVE(Self, ctx);
assert(Self->IsVector()); // should never be created for anything else.
ValueType = Function == NAME_Length ? TypeFloat64 : Self->ValueType;
return this;
}
ExpEmit FxVectorBuiltin::Emit(VMFunctionBuilder *build)
{
ExpEmit to(build, ValueType->GetRegType(), ValueType->GetRegCount());
ExpEmit op = Self->Emit(build);
if (Function == NAME_Length)
{
build->Emit(Self->ValueType == TypeVector2 ? OP_LENV2 : OP_LENV3, to.RegNum, op.RegNum);
}
else
{
ExpEmit len(build, REGT_FLOAT);
build->Emit(Self->ValueType == TypeVector2 ? OP_LENV2 : OP_LENV3, len.RegNum, op.RegNum);
build->Emit(Self->ValueType == TypeVector2 ? OP_DIVVF2_RR : OP_DIVVF3_RR, to.RegNum, op.RegNum, len.RegNum);
len.Free(build);
}
op.Free(build);
return to;
}
//==========================================================================
//
//
//==========================================================================
FxGetClass::FxGetClass(FxExpression *self)
:FxExpression(EFX_GetClass, self->ScriptPosition)
{
Self = self;
}
FxGetClass::~FxGetClass()
{
SAFE_DELETE(Self);
}
FxExpression *FxGetClass::Resolve(FCompileContext &ctx)
{
SAFE_RESOLVE(Self, ctx);
if (!Self->IsObject())
{
ScriptPosition.Message(MSG_ERROR, "GetClass() requires an object");
delete this;
return nullptr;
}
ValueType = NewClassPointer(static_cast<PClass*>(static_cast<PPointer*>(Self->ValueType)->PointedType));
return this;
}
ExpEmit FxGetClass::Emit(VMFunctionBuilder *build)
{
ExpEmit op = Self->Emit(build);
op.Free(build);
ExpEmit to(build, REGT_POINTER);
build->Emit(OP_META, to.RegNum, op.RegNum);
return to;
}
//==========================================================================
//
//
//==========================================================================
FxGetDefaultByType::FxGetDefaultByType(FxExpression *self)
:FxExpression(EFX_GetDefaultByType, self->ScriptPosition)
{
Self = self;
}
FxGetDefaultByType::~FxGetDefaultByType()
{
SAFE_DELETE(Self);
}
FxExpression *FxGetDefaultByType::Resolve(FCompileContext &ctx)
{
SAFE_RESOLVE(Self, ctx);
PClass *cls = nullptr;
if (Self->ValueType == TypeString || Self->ValueType == TypeName)
{
if (Self->isConstant())
{
cls = PClass::FindActor(static_cast<FxConstant *>(Self)->GetValue().GetName());
if (cls == nullptr)
{
ScriptPosition.Message(MSG_ERROR, "GetDefaultByType() requires an actor class type, but got %s", static_cast<FxConstant *>(Self)->GetValue().GetString().GetChars());
delete this;
return nullptr;
}
Self = new FxConstant(cls, NewClassPointer(cls), ScriptPosition);
}
else
{
// this is the ugly case. We do not know what we have and cannot do proper type casting.
// For now error out and let this case require explicit handling on the user side.
ScriptPosition.Message(MSG_ERROR, "GetDefaultByType() requires an actor class type", static_cast<FxConstant *>(Self)->GetValue().GetString().GetChars());
delete this;
return nullptr;
}
}
else
{
auto cp = dyn_cast<PClassPointer>(Self->ValueType);
if (cp == nullptr || !cp->ClassRestriction->IsDescendantOf(RUNTIME_CLASS(AActor)))
{
ScriptPosition.Message(MSG_ERROR, "GetDefaultByType() requires an actor class type");
delete this;
return nullptr;
}
cls = cp->ClassRestriction;
}
ValueType = NewPointer(cls, true);
return this;
}
ExpEmit FxGetDefaultByType::Emit(VMFunctionBuilder *build)
{
ExpEmit op = Self->Emit(build);
op.Free(build);
ExpEmit to(build, REGT_POINTER);
if (op.Konst)
{
build->Emit(OP_LKP, to.RegNum, op.RegNum);
op = to;
}
build->Emit(OP_LO, to.RegNum, op.RegNum, build->GetConstantInt(myoffsetof(PClass, Defaults)));
return to;
}
//==========================================================================
//
//
//==========================================================================
FxColorLiteral::FxColorLiteral(FArgumentList &args, FScriptPosition &sc)
:FxExpression(EFX_ColorLiteral, sc)
{
ArgList = std::move(args);
}
FxExpression *FxColorLiteral::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
unsigned constelements = 0;
assert(ArgList.Size() == 3 || ArgList.Size() == 4);
if (ArgList.Size() == 3) ArgList.Insert(0, nullptr);
for (int i = 0; i < 4; i++)
{
if (ArgList[i] != nullptr)
{
SAFE_RESOLVE(ArgList[i], ctx);
if (!ArgList[i]->IsInteger())
{
ScriptPosition.Message(MSG_ERROR, "Integer expected for color component");
delete this;
return nullptr;
}
if (ArgList[i]->isConstant())
{
constval += clamp(static_cast<FxConstant *>(ArgList[i])->GetValue().GetInt(), 0, 255) << (24 - i * 8);
delete ArgList[i];
ArgList[i] = nullptr;
constelements++;
}
}
else constelements++;
}
if (constelements == 4)
{
auto x = new FxConstant(constval, ScriptPosition);
x->ValueType = TypeColor;
delete this;
return x;
}
ValueType = TypeColor;
return this;
}
ExpEmit FxColorLiteral::Emit(VMFunctionBuilder *build)
{
ExpEmit out(build, REGT_INT);
build->Emit(OP_LK, out.RegNum, build->GetConstantInt(constval));
for (int i = 0; i < 4; i++)
{
if (ArgList[i] != nullptr)
{
assert(!ArgList[i]->isConstant());
ExpEmit in = ArgList[i]->Emit(build);
in.Free(build);
ExpEmit work(build, REGT_INT);
build->Emit(OP_MAX_RK, work.RegNum, in.RegNum, build->GetConstantInt(0));
build->Emit(OP_MIN_RK, work.RegNum, work.RegNum, build->GetConstantInt(255));
if (i != 3) build->Emit(OP_SLL_RI, work.RegNum, work.RegNum, 24 - (i * 8));
build->Emit(OP_OR_RR, out.RegNum, out.RegNum, work.RegNum);
}
}
return out;
}
//==========================================================================
//
// FxSequence :: Resolve
//
//==========================================================================
FxExpression *FxSequence::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
bool fail = false;
for (unsigned i = 0; i < Expressions.Size(); ++i)
{
if (nullptr == (Expressions[i] = Expressions[i]->Resolve(ctx)))
{
fail = true;
}
else if (Expressions[i]->ValueType == TypeError)
{
ScriptPosition.Message(MSG_ERROR, "Invalid statement");
fail = true;
}
}
if (fail)
{
delete this;
return nullptr;
}
return this;
}
//==========================================================================
//
// FxSequence :: CheckReturn
//
//==========================================================================
bool FxSequence::CheckReturn()
{
// a sequence always returns when its last element returns.
return Expressions.Size() > 0 && Expressions.Last()->CheckReturn();
}
//==========================================================================
//
// FxSequence :: Emit
//
//==========================================================================
ExpEmit FxSequence::Emit(VMFunctionBuilder *build)
{
for (unsigned i = 0; i < Expressions.Size(); ++i)
{
ExpEmit v = Expressions[i]->Emit(build);
// Throw away any result. We don't care about it.
v.Free(build);
}
return ExpEmit();
}
//==========================================================================
//
// FxSequence :: GetDirectFunction
//
//==========================================================================
VMFunction *FxSequence::GetDirectFunction()
{
if (Expressions.Size() == 1)
{
return Expressions[0]->GetDirectFunction();
}
return nullptr;
}
//==========================================================================
//
// FxCompoundStatement :: Resolve
//
//==========================================================================
FxExpression *FxCompoundStatement::Resolve(FCompileContext &ctx)
{
auto outer = ctx.Block;
Outer = ctx.Block;
ctx.Block = this;
auto x = FxSequence::Resolve(ctx);
ctx.Block = outer;
return x;
}
//==========================================================================
//
// FxCompoundStatement :: Emit
//
//==========================================================================
ExpEmit FxCompoundStatement::Emit(VMFunctionBuilder *build)
{
auto e = FxSequence::Emit(build);
// Release all local variables in this block.
for (auto l : LocalVars)
{
l->Release(build);
}
return e;
}
//==========================================================================
//
// FxCompoundStatement :: FindLocalVariable
//
// Looks for a variable name in any of the containing compound statements
// This does a simple linear search on each block's variables.
// The lists here normally don't get large enough to justify something more complex.
//
//==========================================================================
FxLocalVariableDeclaration *FxCompoundStatement::FindLocalVariable(FName name, FCompileContext &ctx)
{
auto block = this;
while (block != nullptr)
{
for (auto l : block->LocalVars)
{
if (l->Name == name)
{
return l;
}
}
block = block->Outer;
}
// finally check the context for function arguments
for (auto arg : ctx.FunctionArgs)
{
if (arg->Name == name)
{
return arg;
}
}
return nullptr;
}
//==========================================================================
//
// FxCompoundStatement :: CheckLocalVariable
//
// Checks if the current block already contains a local variable
// of the given name.
//
//==========================================================================
bool FxCompoundStatement::CheckLocalVariable(FName name)
{
for (auto l : LocalVars)
{
if (l->Name == name)
{
return true;
}
}
return false;
}
//==========================================================================
//
// FxSwitchStatement
//
//==========================================================================
FxSwitchStatement::FxSwitchStatement(FxExpression *cond, FArgumentList &content, const FScriptPosition &pos)
: FxExpression(EFX_SwitchStatement, pos)
{
Condition = cond;
Content = std::move(content);
}
FxSwitchStatement::~FxSwitchStatement()
{
SAFE_DELETE(Condition);
}
FxExpression *FxSwitchStatement::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(Condition, ctx);
if (Condition->ValueType != TypeName)
{
Condition = new FxIntCast(Condition, false);
SAFE_RESOLVE(Condition, ctx);
}
if (Content.Size() == 0)
{
ScriptPosition.Message(MSG_WARNING, "Empty switch statement");
if (Condition->isConstant())
{
return new FxNop(ScriptPosition);
}
else
{
// The condition may have a side effect so it should be processed (possible to-do: Analyze all nodes in there and delete if not.)
auto x = Condition;
Condition = nullptr;
delete this;
x->NeedResult = false;
return x;
}
}
auto outerctrl = ctx.ControlStmt;
ctx.ControlStmt = this;
for (auto &line : Content)
{
SAFE_RESOLVE(line, ctx);
line->NeedResult = false;
}
ctx.ControlStmt = outerctrl;
if (Condition->isConstant())
{
ScriptPosition.Message(MSG_WARNING, "Case expression is constant");
auto &content = Content;
int defaultindex = -1;
int defaultbreak = -1;
int caseindex = -1;
int casebreak = -1;
// look for a case label with a matching value
for (unsigned i = 0; i < content.Size(); i++)
{
if (content[i] != nullptr)
{
if (content[i]->ExprType == EFX_CaseStatement)
{
auto casestmt = static_cast<FxCaseStatement *>(content[i]);
if (casestmt->Condition == nullptr) defaultindex = i;
else if (casestmt->CaseValue == static_cast<FxConstant *>(Condition)->GetValue().GetInt()) caseindex = i;
if (casestmt->Condition && casestmt->Condition->ValueType != Condition->ValueType)
{
casestmt->Condition->ScriptPosition.Message(MSG_ERROR, "Type mismatch in case statement");
delete this;
return nullptr;
}
}
if (content[i]->ExprType == EFX_JumpStatement && static_cast<FxJumpStatement *>(content[i])->Token == TK_Break)
{
if (defaultindex >= 0 && defaultbreak < 0) defaultbreak = i;
if (caseindex >= 0 && casebreak < 0)
{
casebreak = i;
break; // when we find this we do not need to look any further.
}
}
}
}
if (caseindex < 0)
{
caseindex = defaultindex;
casebreak = defaultbreak;
}
if (caseindex > 0 && casebreak - caseindex > 1)
{
auto seq = new FxSequence(ScriptPosition);
for (int i = caseindex + 1; i < casebreak; i++)
{
if (content[i] != nullptr && content[i]->ExprType != EFX_CaseStatement)
{
seq->Add(content[i]);
content[i] = nullptr;
}
}
delete this;
return seq->Resolve(ctx);
}
delete this;
return new FxNop(ScriptPosition);
}
int mincase = INT_MAX;
int maxcase = INT_MIN;
for (auto line : Content)
{
if (line->ExprType == EFX_CaseStatement)
{
auto casestmt = static_cast<FxCaseStatement *>(line);
if (casestmt->Condition != nullptr)
{
CaseAddr ca = { casestmt->CaseValue, 0 };
CaseAddresses.Push(ca);
if (ca.casevalue < mincase) mincase = ca.casevalue;
if (ca.casevalue > maxcase) maxcase = ca.casevalue;
}
}
}
return this;
}
ExpEmit FxSwitchStatement::Emit(VMFunctionBuilder *build)
{
assert(Condition != nullptr);
ExpEmit emit = Condition->Emit(build);
assert(emit.RegType == REGT_INT);
// todo:
// - sort jump table by value.
// - optimize the switch dispatcher to run in native code instead of executing each single branch instruction on its own.
// e.g.: build->Emit(OP_SWITCH, emit.RegNum, build->GetConstantInt(CaseAddresses.Size());
for (auto &ca : CaseAddresses)
{
if (ca.casevalue >= 0 && ca.casevalue <= 0xffff)
{
build->Emit(OP_TEST, emit.RegNum, (VM_SHALF)ca.casevalue);
}
else if (ca.casevalue < 0 && ca.casevalue >= -0xffff)
{
build->Emit(OP_TESTN, emit.RegNum, (VM_SHALF)-ca.casevalue);
}
else
{
build->Emit(OP_EQ_K, 1, emit.RegNum, build->GetConstantInt(ca.casevalue));
}
ca.jumpaddress = build->Emit(OP_JMP, 0);
}
size_t DefaultAddress = build->Emit(OP_JMP, 0);
bool defaultset = false;
for (auto line : Content)
{
switch (line->ExprType)
{
case EFX_CaseStatement:
if (static_cast<FxCaseStatement *>(line)->Condition != nullptr)
{
for (auto &ca : CaseAddresses)
{
if (ca.casevalue == static_cast<FxCaseStatement *>(line)->CaseValue)
{
build->BackpatchToHere(ca.jumpaddress);
break;
}
}
}
else
{
build->BackpatchToHere(DefaultAddress);
defaultset = true;
}
break;
default:
line->Emit(build);
break;
}
}
for (auto addr : Breaks)
{
build->BackpatchToHere(addr->Address);
}
if (!defaultset) build->BackpatchToHere(DefaultAddress);
Content.DeleteAndClear();
Content.ShrinkToFit();
return ExpEmit();
}
//==========================================================================
//
// FxSequence :: CheckReturn
//
//==========================================================================
bool FxSwitchStatement::CheckReturn()
{
//A switch statement returns when it contains no breaks and ends with a return
for (auto line : Content)
{
if (line->ExprType == EFX_JumpStatement)
{
return false; // Break means that the end of the statement will be reached, Continue cannot happen in the last statement of the last block.
}
}
return Content.Size() > 0 && Content.Last()->CheckReturn();
}
//==========================================================================
//
// FxCaseStatement
//
//==========================================================================
FxCaseStatement::FxCaseStatement(FxExpression *cond, const FScriptPosition &pos)
: FxExpression(EFX_CaseStatement, pos)
{
Condition = cond;
}
FxCaseStatement::~FxCaseStatement()
{
SAFE_DELETE(Condition);
}
FxExpression *FxCaseStatement::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE_OPT(Condition, ctx);
if (Condition != nullptr)
{
if (!Condition->isConstant())
{
ScriptPosition.Message(MSG_ERROR, "Case label must be a constant value");
delete this;
return nullptr;
}
// Case labels can be ints or names.
if (Condition->ValueType != TypeName)
{
Condition = new FxIntCast(Condition, false);
SAFE_RESOLVE(Condition, ctx);
CaseValue = static_cast<FxConstant *>(Condition)->GetValue().GetInt();
}
else
{
CaseValue = static_cast<FxConstant *>(Condition)->GetValue().GetName();
}
}
return this;
}
//==========================================================================
//
// FxIfStatement
//
//==========================================================================
FxIfStatement::FxIfStatement(FxExpression *cond, FxExpression *true_part,
FxExpression *false_part, const FScriptPosition &pos)
: FxExpression(EFX_IfStatement, pos)
{
Condition = cond;
WhenTrue = true_part;
WhenFalse = false_part;
if (WhenTrue != nullptr) WhenTrue->NeedResult = false;
if (WhenFalse != nullptr) WhenFalse->NeedResult = false;
assert(cond != nullptr);
}
FxIfStatement::~FxIfStatement()
{
SAFE_DELETE(Condition);
SAFE_DELETE(WhenTrue);
SAFE_DELETE(WhenFalse);
}
FxExpression *FxIfStatement::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
if (WhenTrue == nullptr && WhenFalse == nullptr)
{ // We don't do anything either way, so disappear
delete this;
ScriptPosition.Message(MSG_WARNING, "empty if statement");
return new FxNop(ScriptPosition);
}
SAFE_RESOLVE(Condition, ctx);
if (Condition->ValueType != TypeBool)
{
Condition = new FxBoolCast(Condition, false);
SAFE_RESOLVE(Condition, ctx);
}
if (WhenTrue != nullptr)
{
WhenTrue = WhenTrue->Resolve(ctx);
ABORT(WhenTrue);
}
if (WhenFalse != nullptr)
{
WhenFalse = WhenFalse->Resolve(ctx);
ABORT(WhenFalse);
}
ValueType = TypeVoid;
if (Condition->isConstant())
{
ExpVal condval = static_cast<FxConstant *>(Condition)->GetValue();
bool result = condval.GetBool();
FxExpression *e = result ? WhenTrue : WhenFalse;
delete (result ? WhenFalse : WhenTrue);
WhenTrue = WhenFalse = nullptr;
if (e == nullptr) e = new FxNop(ScriptPosition); // create a dummy if this statement gets completely removed by optimizing out the constant parts.
delete this;
return e;
}
return this;
}
ExpEmit FxIfStatement::Emit(VMFunctionBuilder *build)
{
ExpEmit v;
size_t jumpspot;
FxExpression *path1, *path2;
int condcheck;
// This is pretty much copied from FxConditional, except we don't
// keep any results.
ExpEmit cond = Condition->Emit(build);
assert(cond.RegType != REGT_STRING && !cond.Konst);
if (WhenTrue != nullptr)
{
path1 = WhenTrue;
path2 = WhenFalse;
condcheck = 1;
}
else
{
// When there is only a false path, reverse the condition so we can
// treat it as a true path.
assert(WhenFalse != nullptr);
path1 = WhenFalse;
path2 = nullptr;
condcheck = 0;
}
// Test condition.
switch (cond.RegType)
{
default:
case REGT_INT:
build->Emit(OP_EQ_K, condcheck, cond.RegNum, build->GetConstantInt(0));
break;
case REGT_FLOAT:
build->Emit(OP_EQF_K, condcheck, cond.RegNum, build->GetConstantFloat(0));
break;
case REGT_POINTER:
build->Emit(OP_EQA_K, condcheck, cond.RegNum, build->GetConstantAddress(nullptr, ATAG_GENERIC));
break;
}
jumpspot = build->Emit(OP_JMP, 0);
cond.Free(build);
// Evaluate first path
v = path1->Emit(build);
v.Free(build);
if (path2 != nullptr)
{
size_t path1jump;
// if the branch ends with a return we do not need a terminating jmp.
if (!path1->CheckReturn()) path1jump = build->Emit(OP_JMP, 0);
else path1jump = 0xffffffff;
// Evaluate second path
build->BackpatchToHere(jumpspot);
v = path2->Emit(build);
v.Free(build);
jumpspot = path1jump;
}
if (jumpspot != 0xffffffff) build->BackpatchToHere(jumpspot);
return ExpEmit();
}
//==========================================================================
//
// FxIfStatement :: CheckReturn
//
//==========================================================================
bool FxIfStatement::CheckReturn()
{
//An if statement returns if both branches return. Both branches must be present.
return WhenTrue != nullptr && WhenTrue->CheckReturn() &&
WhenFalse != nullptr && WhenFalse->CheckReturn();
}
//==========================================================================
//
// FxLoopStatement :: Resolve
//
// saves the loop pointer in the context and sets this object as the current loop
// so that continues and breaks always resolve to the innermost loop.
//
//==========================================================================
FxExpression *FxLoopStatement::Resolve(FCompileContext &ctx)
{
auto outerctrl = ctx.ControlStmt;
auto outer = ctx.Loop;
ctx.ControlStmt = this;
ctx.Loop = this;
auto x = DoResolve(ctx);
ctx.Loop = outer;
ctx.ControlStmt = outerctrl;
return x;
}
void FxLoopStatement::Backpatch(VMFunctionBuilder *build, size_t loopstart, size_t loopend)
{
// Give a proper address to any break/continue statement within this loop.
for (unsigned int i = 0; i < Jumps.Size(); i++)
{
if (Jumps[i]->Token == TK_Break)
{
build->Backpatch(Jumps[i]->Address, loopend);
}
else
{ // Continue statement.
build->Backpatch(Jumps[i]->Address, loopstart);
}
}
}
//==========================================================================
//
// FxWhileLoop
//
//==========================================================================
FxWhileLoop::FxWhileLoop(FxExpression *condition, FxExpression *code, const FScriptPosition &pos)
: FxLoopStatement(EFX_WhileLoop, pos), Condition(condition), Code(code)
{
ValueType = TypeVoid;
}
FxWhileLoop::~FxWhileLoop()
{
SAFE_DELETE(Condition);
SAFE_DELETE(Code);
}
FxExpression *FxWhileLoop::DoResolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(Condition, ctx);
SAFE_RESOLVE_OPT(Code, ctx);
if (Condition->ValueType != TypeBool)
{
Condition = new FxBoolCast(Condition);
SAFE_RESOLVE(Condition, ctx);
}
if (Condition->isConstant())
{
if (static_cast<FxConstant *>(Condition)->GetValue().GetBool() == false)
{ // Nothing happens
FxExpression *nop = new FxNop(ScriptPosition);
delete this;
return nop;
}
else if (Code == nullptr)
{ // "while (true) { }"
// Someone could be using this for testing.
ScriptPosition.Message(MSG_WARNING, "Infinite empty loop");
}
}
return this;
}
ExpEmit FxWhileLoop::Emit(VMFunctionBuilder *build)
{
assert(Condition->ValueType == TypeBool);
size_t loopstart, loopend;
size_t jumpspot;
// Evaluate the condition and execute/break out of the loop.
loopstart = build->GetAddress();
if (!Condition->isConstant())
{
ExpEmit cond = Condition->Emit(build);
build->Emit(OP_TEST, cond.RegNum, 0);
jumpspot = build->Emit(OP_JMP, 0);
cond.Free(build);
}
else assert(static_cast<FxConstant *>(Condition)->GetValue().GetBool() == true);
// Execute the loop's content.
if (Code != nullptr)
{
ExpEmit code = Code->Emit(build);
code.Free(build);
}
// Loop back.
build->Backpatch(build->Emit(OP_JMP, 0), loopstart);
loopend = build->GetAddress();
if (!Condition->isConstant())
{
build->Backpatch(jumpspot, loopend);
}
Backpatch(build, loopstart, loopend);
return ExpEmit();
}
//==========================================================================
//
// FxDoWhileLoop
//
//==========================================================================
FxDoWhileLoop::FxDoWhileLoop(FxExpression *condition, FxExpression *code, const FScriptPosition &pos)
: FxLoopStatement(EFX_DoWhileLoop, pos), Condition(condition), Code(code)
{
ValueType = TypeVoid;
}
FxDoWhileLoop::~FxDoWhileLoop()
{
SAFE_DELETE(Condition);
SAFE_DELETE(Code);
}
FxExpression *FxDoWhileLoop::DoResolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(Condition, ctx);
SAFE_RESOLVE_OPT(Code, ctx);
if (Condition->ValueType != TypeBool)
{
Condition = new FxBoolCast(Condition);
SAFE_RESOLVE(Condition, ctx);
}
if (Condition->isConstant())
{
if (static_cast<FxConstant *>(Condition)->GetValue().GetBool() == false)
{ // The code executes once, if any.
if (Jumps.Size() == 0)
{ // We would still have to handle the jumps however.
FxExpression *e = Code;
if (e == nullptr) e = new FxNop(ScriptPosition);
Code = nullptr;
delete this;
return e;
}
}
else if (Code == nullptr)
{ // "do { } while (true);"
// Someone could be using this for testing.
ScriptPosition.Message(MSG_WARNING, "Infinite empty loop");
}
}
return this;
}
ExpEmit FxDoWhileLoop::Emit(VMFunctionBuilder *build)
{
assert(Condition->ValueType == TypeBool);
size_t loopstart, loopend;
size_t codestart;
// Execute the loop's content.
codestart = build->GetAddress();
if (Code != nullptr)
{
ExpEmit code = Code->Emit(build);
code.Free(build);
}
// Evaluate the condition and execute/break out of the loop.
loopstart = build->GetAddress();
if (!Condition->isConstant())
{
ExpEmit cond = Condition->Emit(build);
build->Emit(OP_TEST, cond.RegNum, 1);
cond.Free(build);
build->Backpatch(build->Emit(OP_JMP, 0), codestart);
}
else if (static_cast<FxConstant *>(Condition)->GetValue().GetBool() == true)
{ // Always looping
build->Backpatch(build->Emit(OP_JMP, 0), codestart);
}
loopend = build->GetAddress();
Backpatch(build, loopstart, loopend);
return ExpEmit();
}
//==========================================================================
//
// FxForLoop
//
//==========================================================================
FxForLoop::FxForLoop(FxExpression *init, FxExpression *condition, FxExpression *iteration, FxExpression *code, const FScriptPosition &pos)
: FxLoopStatement(EFX_ForLoop, pos), Init(init), Condition(condition), Iteration(iteration), Code(code)
{
ValueType = TypeVoid;
if (Iteration != nullptr) Iteration->NeedResult = false;
if (Code != nullptr) Code->NeedResult = false;
}
FxForLoop::~FxForLoop()
{
SAFE_DELETE(Init);
SAFE_DELETE(Condition);
SAFE_DELETE(Iteration);
SAFE_DELETE(Code);
}
FxExpression *FxForLoop::DoResolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE_OPT(Init, ctx);
SAFE_RESOLVE_OPT(Condition, ctx);
SAFE_RESOLVE_OPT(Iteration, ctx);
SAFE_RESOLVE_OPT(Code, ctx);
if (Condition != nullptr)
{
if (Condition->ValueType != TypeBool)
{
Condition = new FxBoolCast(Condition);
SAFE_RESOLVE(Condition, ctx);
}
if (Condition->isConstant())
{
if (static_cast<FxConstant *>(Condition)->GetValue().GetBool() == false)
{ // Nothing happens
FxExpression *nop = new FxNop(ScriptPosition);
delete this;
return nop;
}
else
{ // "for (..; true; ..)"
delete Condition;
Condition = nullptr;
}
}
}
if (Condition == nullptr && Code == nullptr)
{ // "for (..; ; ..) { }"
// Someone could be using this for testing.
ScriptPosition.Message(MSG_WARNING, "Infinite empty loop");
}
return this;
}
ExpEmit FxForLoop::Emit(VMFunctionBuilder *build)
{
assert((Condition && Condition->ValueType == TypeBool && !Condition->isConstant()) || Condition == nullptr);
size_t loopstart, loopend;
size_t codestart;
size_t jumpspot;
// Init statement (only used by DECORATE. ZScript is pulling it before the loop statement and enclosing the entire loop in a compound statement so that Init can have local variables.)
if (Init != nullptr)
{
ExpEmit init = Init->Emit(build);
init.Free(build);
}
// Evaluate the condition and execute/break out of the loop.
codestart = build->GetAddress();
if (Condition != nullptr)
{
ExpEmit cond = Condition->Emit(build);
build->Emit(OP_TEST, cond.RegNum, 0);
cond.Free(build);
jumpspot = build->Emit(OP_JMP, 0);
}
// Execute the loop's content.
if (Code != nullptr)
{
ExpEmit code = Code->Emit(build);
code.Free(build);
}
// Iteration statement.
loopstart = build->GetAddress();
if (Iteration != nullptr)
{
ExpEmit iter = Iteration->Emit(build);
iter.Free(build);
}
build->Backpatch(build->Emit(OP_JMP, 0), codestart);
// End of loop.
loopend = build->GetAddress();
if (Condition != nullptr)
{
build->Backpatch(jumpspot, loopend);
}
Backpatch(build, loopstart, loopend);
return ExpEmit();
}
//==========================================================================
//
// FxJumpStatement
//
//==========================================================================
FxJumpStatement::FxJumpStatement(int token, const FScriptPosition &pos)
: FxExpression(EFX_JumpStatement, pos), Token(token)
{
ValueType = TypeVoid;
}
FxExpression *FxJumpStatement::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
if (ctx.ControlStmt != nullptr)
{
if (ctx.ControlStmt == ctx.Loop || Token == TK_Continue)
{
ctx.Loop->Jumps.Push(this);
}
else
{
// break in switch.
static_cast<FxSwitchStatement*>(ctx.ControlStmt)->Breaks.Push(this);
}
return this;
}
else
{
ScriptPosition.Message(MSG_ERROR, "'%s' outside of a loop", Token == TK_Break ? "break" : "continue");
delete this;
return nullptr;
}
}
ExpEmit FxJumpStatement::Emit(VMFunctionBuilder *build)
{
Address = build->Emit(OP_JMP, 0);
return ExpEmit();
}
//==========================================================================
//
//==========================================================================
FxReturnStatement::FxReturnStatement(FxExpression *value, const FScriptPosition &pos)
: FxExpression(EFX_ReturnStatement, pos), Value(value)
{
ValueType = TypeVoid;
}
FxReturnStatement::~FxReturnStatement()
{
SAFE_DELETE(Value);
}
FxExpression *FxReturnStatement::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE_OPT(Value, ctx);
PPrototype *retproto;
if (Value == nullptr)
{
TArray<PType *> none(0);
retproto = NewPrototype(none, none);
}
else
{
// If we already know the real return type we need at least try to cast the value to its proper type (unless in an anonymous function.)
if (ctx.ReturnProto != nullptr && ctx.ReturnProto->ReturnTypes.Size() > 0 && ctx.Function->SymbolName != NAME_None)
{
Value = new FxTypeCast(Value, ctx.ReturnProto->ReturnTypes[0], false, false);
Value = Value->Resolve(ctx);
ABORT(Value);
}
retproto = Value->ReturnProto();
}
ctx.CheckReturn(retproto, ScriptPosition);
return this;
}
ExpEmit FxReturnStatement::Emit(VMFunctionBuilder *build)
{
ExpEmit out(0, REGT_NIL);
// If we return nothing, use a regular RET opcode.
// Otherwise just return the value we're given.
if (Value == nullptr)
{
build->Emit(OP_RET, RET_FINAL, REGT_NIL, 0);
}
else
{
out = Value->Emit(build);
// Check if it is a function call that simplified itself
// into a tail call in which case we don't emit anything.
if (!out.Final)
{
if (Value->ValueType == TypeVoid)
{ // Nothing is returned.
build->Emit(OP_RET, RET_FINAL, REGT_NIL, 0);
}
else
{
build->Emit(OP_RET, RET_FINAL, EncodeRegType(out), out.RegNum);
}
}
}
out.Final = true;
return out;
}
VMFunction *FxReturnStatement::GetDirectFunction()
{
if (Value != nullptr)
{
return Value->GetDirectFunction();
}
return nullptr;
}
//==========================================================================
//
//==========================================================================
FxClassTypeCast::FxClassTypeCast(PClassPointer *dtype, FxExpression *x)
: FxExpression(EFX_ClassTypeCast, x->ScriptPosition)
{
ValueType = dtype;
desttype = dtype->ClassRestriction;
basex=x;
}
//==========================================================================
//
//
//
//==========================================================================
FxClassTypeCast::~FxClassTypeCast()
{
SAFE_DELETE(basex);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxClassTypeCast::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(basex, ctx);
if (basex->ValueType == TypeNullPtr)
{
basex->ValueType = ValueType;
auto x = basex;
basex = nullptr;
delete this;
return x;
}
auto to = static_cast<PClassPointer *>(ValueType);
if (basex->ValueType->GetClass() == RUNTIME_CLASS(PClassPointer))
{
auto from = static_cast<PClassPointer *>(basex->ValueType);
if (from->ClassRestriction->IsDescendantOf(to->ClassRestriction))
{
basex->ValueType = to;
auto x = basex;
basex = nullptr;
delete this;
return x;
}
ScriptPosition.Message(MSG_ERROR, "Cannot convert from %s to %s: Incompatible class types", from->ClassRestriction->TypeName.GetChars(), to->ClassRestriction->TypeName.GetChars());
delete this;
return nullptr;
}
if (basex->ValueType != TypeName && basex->ValueType != TypeString)
{
ScriptPosition.Message(MSG_ERROR, "Cannot convert %s to class type", basex->ValueType->DescriptiveName());
delete this;
return nullptr;
}
if (basex->isConstant())
{
FName clsname = static_cast<FxConstant *>(basex)->GetValue().GetName();
PClass *cls = nullptr;
if (clsname != NAME_None)
{
cls = PClass::FindClass(clsname);
if (cls == nullptr)
{
/* lax */
// Since this happens in released WADs it must pass without a terminal error... :(
ScriptPosition.Message(MSG_OPTERROR,
"Unknown class name '%s'",
clsname.GetChars(), desttype->TypeName.GetChars());
}
else
{
if (!cls->IsDescendantOf(desttype))
{
ScriptPosition.Message(MSG_OPTERROR, "class '%s' is not compatible with '%s'", clsname.GetChars(), desttype->TypeName.GetChars());
cls = nullptr;
}
else ScriptPosition.Message(MSG_DEBUGLOG, "resolving '%s' as class name", clsname.GetChars());
}
}
FxExpression *x = new FxConstant(cls, to, ScriptPosition);
delete this;
return x;
}
if (basex->ValueType == TypeString)
{
basex = new FxNameCast(basex);
}
return this;
}
//==========================================================================
//
//
//
//==========================================================================
int BuiltinNameToClass(VMValue *param, TArray<VMValue> &defaultparam, int numparam, VMReturn *ret, int numret)
{
assert(numparam == 2);
assert(numret == 1);
assert(param[0].Type == REGT_INT);
assert(param[1].Type == REGT_POINTER);
assert(ret->RegType == REGT_POINTER);
FName clsname = ENamedName(param[0].i);
if (clsname != NAME_None)
{
const PClass *cls = PClass::FindClass(clsname);
const PClass *desttype = reinterpret_cast<PClass *>(param[1].a);
if (!cls->IsDescendantOf(desttype))
{
// Let the caller check this. The message can be enabled for diagnostic purposes.
DPrintf(DMSG_SPAMMY, "class '%s' is not compatible with '%s'\n", clsname.GetChars(), desttype->TypeName.GetChars());
cls = nullptr;
}
ret->SetPointer(const_cast<PClass *>(cls), ATAG_OBJECT);
}
else ret->SetPointer(nullptr, ATAG_OBJECT);
return 1;
}
ExpEmit FxClassTypeCast::Emit(VMFunctionBuilder *build)
{
if (basex->ValueType != TypeName)
{
return ExpEmit(build->GetConstantAddress(nullptr, ATAG_OBJECT), REGT_POINTER, true);
}
ExpEmit clsname = basex->Emit(build);
assert(!clsname.Konst);
ExpEmit dest(build, REGT_POINTER);
build->Emit(OP_PARAM, 0, clsname.RegType, clsname.RegNum);
build->Emit(OP_PARAM, 0, REGT_POINTER | REGT_KONST, build->GetConstantAddress(const_cast<PClass *>(desttype), ATAG_OBJECT));
// Call the BuiltinNameToClass function to convert from 'name' to class.
VMFunction *callfunc;
PSymbol *sym = FindBuiltinFunction(NAME_BuiltinNameToClass, BuiltinNameToClass);
assert(sym->IsKindOf(RUNTIME_CLASS(PSymbolVMFunction)));
assert(((PSymbolVMFunction *)sym)->Function != nullptr);
callfunc = ((PSymbolVMFunction *)sym)->Function;
build->Emit(OP_CALL_K, build->GetConstantAddress(callfunc, ATAG_OBJECT), 2, 1);
build->Emit(OP_RESULT, 0, REGT_POINTER, dest.RegNum);
clsname.Free(build);
return dest;
}
//==========================================================================
//
//==========================================================================
FxClassPtrCast::FxClassPtrCast(PClass *dtype, FxExpression *x)
: FxExpression(EFX_ClassPtrCast, x->ScriptPosition)
{
ValueType = NewClassPointer(dtype);
desttype = dtype;
basex = x;
}
//==========================================================================
//
//
//
//==========================================================================
FxClassPtrCast::~FxClassPtrCast()
{
SAFE_DELETE(basex);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxClassPtrCast::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(basex, ctx);
if (basex->ValueType == TypeNullPtr)
{
basex->ValueType = ValueType;
auto x = basex;
basex = nullptr;
delete this;
return x;
}
auto to = static_cast<PClassPointer *>(ValueType);
if (basex->ValueType->GetClass() == RUNTIME_CLASS(PClassPointer))
{
auto from = static_cast<PClassPointer *>(basex->ValueType);
// Downcast is always ok.
if (from->ClassRestriction->IsDescendantOf(to->ClassRestriction))
{
basex->ValueType = to;
auto x = basex;
basex = nullptr;
delete this;
return x;
}
// Upcast needs a runtime check.
else if (to->ClassRestriction->IsDescendantOf(from->ClassRestriction))
{
return this;
}
}
else if (basex->ValueType == TypeString || basex->ValueType == TypeName)
{
FxExpression *x = new FxClassTypeCast(to, basex);
basex = nullptr;
delete this;
return x->Resolve(ctx);
}
// Everything else is an error.
ScriptPosition.Message(MSG_ERROR, "Cannot cast %s to %s. The types are incompatible.", basex->ValueType->DescriptiveName(), to->DescriptiveName());
delete this;
return nullptr;
}
//==========================================================================
//
//
//
//==========================================================================
int BuiltinClassCast(VMValue *param, TArray<VMValue> &defaultparam, int numparam, VMReturn *ret, int numret)
{
PARAM_PROLOGUE;
PARAM_CLASS(from, DObject);
PARAM_CLASS(to, DObject);
ACTION_RETURN_OBJECT(from->IsDescendantOf(to) ? from : nullptr);
}
ExpEmit FxClassPtrCast::Emit(VMFunctionBuilder *build)
{
ExpEmit clsname = basex->Emit(build);
build->Emit(OP_PARAM, 0, clsname.RegType, clsname.RegNum);
build->Emit(OP_PARAM, 0, REGT_POINTER | REGT_KONST, build->GetConstantAddress(desttype, ATAG_OBJECT));
VMFunction *callfunc;
PSymbol *sym = FindBuiltinFunction(NAME_BuiltinClassCast, BuiltinClassCast);
assert(sym->IsKindOf(RUNTIME_CLASS(PSymbolVMFunction)));
assert(((PSymbolVMFunction *)sym)->Function != nullptr);
callfunc = ((PSymbolVMFunction *)sym)->Function;
clsname.Free(build);
ExpEmit dest(build, REGT_POINTER);
build->Emit(OP_CALL_K, build->GetConstantAddress(callfunc, ATAG_OBJECT), 2, 1);
build->Emit(OP_RESULT, 0, REGT_POINTER, dest.RegNum);
return dest;
}
//==========================================================================
//
// Symbolic state labels.
// Conversion will not happen inside the compiler anymore because it causes
// just too many problems.
//
//==========================================================================
FxExpression *FxStateByIndex::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
ABORT(ctx.Class);
auto aclass = dyn_cast<PClassActor>(ctx.Class);
// This expression type can only be used from actors, for everything else it has already produced a compile error.
assert(aclass != nullptr && aclass->NumOwnedStates > 0);
if (aclass->NumOwnedStates <= index)
{
ScriptPosition.Message(MSG_ERROR, "%s: Attempt to jump to non existing state index %d",
ctx.Class->TypeName.GetChars(), index);
delete this;
return nullptr;
}
int symlabel = StateLabels.AddPointer(aclass->OwnedStates + index);
FxExpression *x = new FxConstant(symlabel, ScriptPosition);
x->ValueType = TypeStateLabel;
delete this;
return x;
}
//==========================================================================
//
//
//
//==========================================================================
FxRuntimeStateIndex::FxRuntimeStateIndex(FxExpression *index)
: FxExpression(EFX_RuntimeStateIndex, index->ScriptPosition), Index(index)
{
ValueType = TypeStateLabel;
}
FxRuntimeStateIndex::~FxRuntimeStateIndex()
{
SAFE_DELETE(Index);
}
FxExpression *FxRuntimeStateIndex::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(Index, ctx);
if (!Index->IsNumeric())
{
ScriptPosition.Message(MSG_ERROR, "Numeric type expected");
delete this;
return nullptr;
}
else if (Index->isConstant())
{
int index = static_cast<FxConstant *>(Index)->GetValue().GetInt();
if (index < 0 || (index == 0 && !ctx.FromDecorate))
{
ScriptPosition.Message(MSG_ERROR, "State index must be positive");
delete this;
return nullptr;
}
else if (index == 0)
{
int symlabel = StateLabels.AddPointer(nullptr);
auto x = new FxConstant(symlabel, ScriptPosition);
delete this;
x->ValueType = TypeStateLabel;
return x;
}
else
{
auto x = new FxStateByIndex(ctx.StateIndex + index, ScriptPosition);
delete this;
return x->Resolve(ctx);
}
}
else if (Index->ValueType->GetRegType() != REGT_INT)
{ // Float.
Index = new FxIntCast(Index, ctx.FromDecorate);
SAFE_RESOLVE(Index, ctx);
}
auto aclass = dyn_cast<PClassActor>(ctx.Class);
assert(aclass != nullptr && aclass->NumOwnedStates > 0);
symlabel = StateLabels.AddPointer(aclass->OwnedStates + ctx.StateIndex);
ValueType = TypeStateLabel;
return this;
}
ExpEmit FxRuntimeStateIndex::Emit(VMFunctionBuilder *build)
{
ExpEmit out = Index->Emit(build);
// out = (clamp(Index, 0, 32767) << 16) | symlabel | 0x80000000; 0x80000000 is here to make it negative.
build->Emit(OP_MAX_RK, out.RegNum, out.RegNum, build->GetConstantInt(0));
build->Emit(OP_MIN_RK, out.RegNum, out.RegNum, build->GetConstantInt(32767));
build->Emit(OP_SLL_RI, out.RegNum, out.RegNum, 16);
build->Emit(OP_OR_RK, out.RegNum, out.RegNum, build->GetConstantInt(symlabel|0x80000000));
return out;
}
//==========================================================================
//
//
//
//==========================================================================
FxMultiNameState::FxMultiNameState(const char *_statestring, const FScriptPosition &pos)
:FxExpression(EFX_MultiNameState, pos)
{
FName scopename;
FString statestring = _statestring;
int scopeindex = statestring.IndexOf("::");
if (scopeindex >= 0)
{
scopename = FName(statestring, scopeindex, false);
statestring = statestring.Right(statestring.Len() - scopeindex - 2);
}
else
{
scopename = NAME_None;
}
names = MakeStateNameList(statestring);
names.Insert(0, scopename);
scope = nullptr;
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxMultiNameState::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
ABORT(ctx.Class);
int symlabel;
auto clstype = dyn_cast<PClassActor>(ctx.Class);
if (names[0] == NAME_None)
{
scope = nullptr;
}
else if (clstype == nullptr)
{
// not in an actor, so any further checks are pointless.
ScriptPosition.Message(MSG_ERROR, "'%s' is not an ancestor of '%s'", names[0].GetChars(), ctx.Class->TypeName.GetChars());
delete this;
return nullptr;
}
else if (names[0] == NAME_Super)
{
scope = dyn_cast<PClassActor>(clstype->ParentClass);
}
else
{
scope = PClass::FindActor(names[0]);
if (scope == nullptr)
{
ScriptPosition.Message(MSG_ERROR, "Unknown class '%s' in state label", names[0].GetChars());
delete this;
return nullptr;
}
else if (!scope->IsAncestorOf(clstype))
{
ScriptPosition.Message(MSG_ERROR, "'%s' is not an ancestor of '%s'", names[0].GetChars(), ctx.Class->TypeName.GetChars());
delete this;
return nullptr;
}
}
if (scope != nullptr)
{
FState *destination = nullptr;
// If the label is class specific we can resolve it right here
if (names[1] != NAME_None)
{
destination = scope->FindState(names.Size()-1, &names[1], false);
if (destination == nullptr)
{
ScriptPosition.Message(MSG_OPTERROR, "Unknown state jump destination");
/* lax */
return this;
}
}
symlabel = StateLabels.AddPointer(destination);
}
else
{
names.Delete(0);
symlabel = StateLabels.AddNames(names);
}
FxExpression *x = new FxConstant(symlabel, ScriptPosition);
x->ValueType = TypeStateLabel;
delete this;
return x;
}
//==========================================================================
//
// declares a single local variable (no arrays)
//
//==========================================================================
FxLocalVariableDeclaration::FxLocalVariableDeclaration(PType *type, FName name, FxExpression *initval, int varflags, const FScriptPosition &p)
:FxExpression(EFX_LocalVariableDeclaration, p)
{
ValueType = type;
VarFlags = varflags;
Name = name;
RegCount = type == TypeVector2 ? 2 : type == TypeVector3 ? 3 : 1;
Init = initval;
}
FxLocalVariableDeclaration::~FxLocalVariableDeclaration()
{
SAFE_DELETE(Init);
}
FxExpression *FxLocalVariableDeclaration::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
if (ctx.Block == nullptr)
{
ScriptPosition.Message(MSG_ERROR, "Variable declaration outside compound statement");
delete this;
return nullptr;
}
if (ValueType->RegType == REGT_NIL)
{
auto sfunc = static_cast<VMScriptFunction *>(ctx.Function->Variants[0].Implementation);
StackOffset = sfunc->AllocExtraStack(ValueType);
// Todo: Process the compound initializer once implemented.
}
else
{
if (Init) Init = new FxTypeCast(Init, ValueType, false);
SAFE_RESOLVE_OPT(Init, ctx);
}
ctx.Block->LocalVars.Push(this);
return this;
}
void FxLocalVariableDeclaration::SetReg(ExpEmit emit)
{
assert(ValueType->GetRegType() == emit.RegType && ValueType->GetRegCount() == emit.RegCount);
RegNum = emit.RegNum;
}
ExpEmit FxLocalVariableDeclaration::Emit(VMFunctionBuilder *build)
{
if (ValueType->RegType != REGT_NIL)
{
if (Init == nullptr)
{
if (RegNum == -1)
{
if (!(VarFlags & VARF_Out)) RegNum = build->Registers[ValueType->GetRegType()].Get(RegCount);
else RegNum = build->Registers[REGT_POINTER].Get(1);
}
}
else
{
assert(!(VarFlags & VARF_Out)); // 'out' variables should never be initialized, they can only exist as function parameters.
ExpEmit emitval = Init->Emit(build);
int regtype = emitval.RegType;
if (regtype < REGT_INT || regtype > REGT_TYPE)
{
ScriptPosition.Message(MSG_ERROR, "Attempted to assign a non-value");
return ExpEmit();
}
if (emitval.Konst)
{
auto constval = static_cast<FxConstant *>(Init);
RegNum = build->Registers[regtype].Get(1);
switch (regtype)
{
default:
case REGT_INT:
build->Emit(OP_LK, RegNum, build->GetConstantInt(constval->GetValue().GetInt()));
break;
case REGT_FLOAT:
build->Emit(OP_LKF, RegNum, build->GetConstantFloat(constval->GetValue().GetFloat()));
break;
case REGT_POINTER:
{
bool isobject = ValueType->IsKindOf(RUNTIME_CLASS(PClassPointer)) || (ValueType->IsKindOf(RUNTIME_CLASS(PPointer)) && static_cast<PPointer*>(ValueType)->PointedType->IsKindOf(RUNTIME_CLASS(PClass)));
build->Emit(OP_LKP, RegNum, build->GetConstantAddress(constval->GetValue().GetPointer(), isobject ? ATAG_OBJECT : ATAG_GENERIC));
break;
}
case REGT_STRING:
build->Emit(OP_LKS, RegNum, build->GetConstantString(constval->GetValue().GetString()));
}
emitval.Free(build);
}
else if (Init->ExprType != EFX_LocalVariable)
{
// take over the register that got allocated while emitting the Init expression.
RegNum = emitval.RegNum;
}
else
{
ExpEmit out(build, emitval.RegType, emitval.RegCount);
build->Emit(ValueType->GetMoveOp(), out.RegNum, emitval.RegNum);
RegNum = out.RegNum;
}
}
}
else
{
// Init arrays and structs.
}
return ExpEmit();
}
void FxLocalVariableDeclaration::Release(VMFunctionBuilder *build)
{
// Release the register after the containing block gets closed
if(RegNum != -1)
{
build->Registers[ValueType->GetRegType()].Return(RegNum, RegCount);
}
// Stack space will not be released because that would make controlled destruction impossible.
// For that all local stack variables need to live for the entire execution of a function.
}
FxStaticArray::FxStaticArray(PType *type, FName name, FArgumentList &args, const FScriptPosition &pos)
: FxLocalVariableDeclaration(NewArray(type, args.Size()), name, nullptr, VARF_Static|VARF_ReadOnly, pos)
{
ElementType = type;
ExprType = EFX_StaticArray;
values = std::move(args);
}
FxExpression *FxStaticArray::Resolve(FCompileContext &ctx)
{
bool fail = false;
for (unsigned i = 0; i < values.Size(); i++)
{
values[i] = new FxTypeCast(values[i], ElementType, false);
values[i] = values[i]->Resolve(ctx);
if (values[i] == nullptr) fail = true;
else if (!values[i]->isConstant())
{
ScriptPosition.Message(MSG_ERROR, "Initializer must be constant");
fail = true;
}
}
if (fail)
{
delete this;
return nullptr;
}
if (ElementType->GetRegType() == REGT_NIL)
{
ScriptPosition.Message(MSG_ERROR, "Invalid type for constant array");
delete this;
return nullptr;
}
ctx.Block->LocalVars.Push(this);
return this;
}
ExpEmit FxStaticArray::Emit(VMFunctionBuilder *build)
{
switch (ElementType->GetRegType())
{
default:
assert(false && "Invalid register type");
break;
case REGT_INT:
{
TArray<int> cvalues;
for (auto v : values) cvalues.Push(static_cast<FxConstant *>(v)->GetValue().GetInt());
StackOffset = build->AllocConstantsInt(cvalues.Size(), &cvalues[0]);
break;
}
case REGT_FLOAT:
{
TArray<double> cvalues;
for (auto v : values) cvalues.Push(static_cast<FxConstant *>(v)->GetValue().GetFloat());
StackOffset = build->AllocConstantsFloat(cvalues.Size(), &cvalues[0]);
break;
}
case REGT_STRING:
{
TArray<FString> cvalues;
for (auto v : values) cvalues.Push(static_cast<FxConstant *>(v)->GetValue().GetString());
StackOffset = build->AllocConstantsString(cvalues.Size(), &cvalues[0]);
break;
}
case REGT_POINTER:
{
TArray<void*> cvalues;
for (auto v : values) cvalues.Push(static_cast<FxConstant *>(v)->GetValue().GetPointer());
StackOffset = build->AllocConstantsAddress(cvalues.Size(), &cvalues[0], ElementType->GetLoadOp() == OP_LO ? ATAG_OBJECT : ATAG_GENERIC);
break;
}
}
return ExpEmit();
}
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