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gzdoom-gles/src/scripting/codegeneration/codegen.cpp
Christoph Oelckers a6a0c4b93c - handle all unary operators. 
- handle all binary operators which are already implemented in the code generator.
- implemented sizeof/alignof operators in code generator.
- rewrote RequestAddress so that its return value is not the writability of an address but the mere existence. Also changed it to not output errors itself because those cannot be dealt with by the calling function.
2016-10-17 20:33:35 +02:00

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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 "math/cmath.h"
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) : ReturnProto(ret), Function(fnc), Class(nullptr), FromDecorate(fromdecorate)
{
if (fnc != nullptr) Class = fnc->OwningClass;
}
FCompileContext::FCompileContext(PClass *cls) : ReturnProto(nullptr), Function(nullptr), Class(cls), FromDecorate(true) // only used by DECORATE constants.
{
}
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, "All return expressions must deduce to the same type");
}
}
//==========================================================================
//
// ExpEmit
//
//==========================================================================
ExpEmit::ExpEmit(VMFunctionBuilder *build, int type)
: RegNum(build->Registers[type].Get(1)), RegType(type), Konst(false), Fixed(false), Final(false)
{
}
void ExpEmit::Free(VMFunctionBuilder *build)
{
if (!Fixed && !Konst && RegType <= REGT_TYPE)
{
build->Registers[RegType].Return(RegNum, 1);
}
}
void ExpEmit::Reuse(VMFunctionBuilder *build)
{
if (!Fixed && !Konst)
{
bool success = build->Registers[RegType].Reuse(RegNum);
assert(success && "Attempt to reuse a register that is already in use");
}
}
//==========================================================================
//
// FindDecorateBuiltinFunction
//
// Returns the symbol for a decorate utility function. If not found, create
// it and install it in Actor.
//
//==========================================================================
static PSymbol *FindDecorateBuiltinFunction(FName funcname, VMNativeFunction::NativeCallType func)
{
PSymbol *sym = RUNTIME_CLASS(AActor)->Symbols.FindSymbol(funcname, false);
if (sym == NULL)
{
PSymbolVMFunction *symfunc = new PSymbolVMFunction(funcname);
VMNativeFunction *calldec = new VMNativeFunction(func, funcname);
symfunc->Function = calldec;
sym = symfunc;
RUNTIME_CLASS(AActor)->Symbols.AddSymbol(sym);
}
return sym;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxExpression::Emit (VMFunctionBuilder *build)
{
ScriptPosition.Message(MSG_ERROR, "Unemitted expression found");
return ExpEmit();
}
//==========================================================================
//
//
//
//==========================================================================
bool FxExpression::isConstant() const
{
return false;
}
//==========================================================================
//
//
//
//==========================================================================
VMFunction *FxExpression::GetDirectFunction()
{
return NULL;
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxExpression::Resolve(FCompileContext &ctx)
{
isresolved = true;
return this;
}
//==========================================================================
//
// Returns true if we can write to the address.
//
//==========================================================================
bool FxExpression::RequestAddress(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 void 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);
}
else
{
int regtype = where.RegType;
if (where.Konst)
{
regtype |= REGT_KONST;
}
build->Emit(OP_PARAM, 0, regtype, where.RegNum);
where.Free(build);
}
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxConstant::MakeConstant(PSymbol *sym, const FScriptPosition &pos)
{
FxExpression *x;
PSymbolConstNumeric *csym = dyn_cast<PSymbolConstNumeric>(sym);
if (csym != NULL)
{
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 NULL;
}
}
else
{
pos.Message(MSG_ERROR, "'%s' is not a constant\n", sym->SymbolName.GetChars());
x = NULL;
}
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;
}
//==========================================================================
//
//
//
//==========================================================================
FxBoolCast::FxBoolCast(FxExpression *x)
: FxExpression(x->ScriptPosition)
{
basex = x;
ValueType = TypeBool;
}
//==========================================================================
//
//
//
//==========================================================================
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->ValueType->GetRegType() == REGT_INT || basex->ValueType->GetRegType() == REGT_FLOAT || basex->ValueType->GetRegType() == REGT_POINTER)
{
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);
ExpEmit to(build, REGT_INT);
from.Free(build);
// Preload result with 0.
build->Emit(OP_LI, to.RegNum, 0);
// Check source against 0.
if (from.RegType == REGT_INT)
{
build->Emit(OP_EQ_R, 1, from.RegNum, to.RegNum);
}
else if (from.RegType == REGT_FLOAT)
{
build->Emit(OP_EQF_K, 1, from.RegNum, build->GetConstantFloat(0.));
}
else if (from.RegType == REGT_POINTER)
{
build->Emit(OP_EQA_K, 1, from.RegNum, build->GetConstantAddress(nullptr, ATAG_GENERIC));
}
build->Emit(OP_JMP, 1);
// Reload result with 1 if the comparison fell through.
build->Emit(OP_LI, to.RegNum, 1);
return to;
}
//==========================================================================
//
//
//
//==========================================================================
FxIntCast::FxIntCast(FxExpression *x, bool nowarn)
: FxExpression(x->ScriptPosition)
{
basex=x;
ValueType = TypeSInt32;
NoWarn = nowarn;
}
//==========================================================================
//
//
//
//==========================================================================
FxIntCast::~FxIntCast()
{
SAFE_DELETE(basex);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxIntCast::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(basex, ctx);
if (basex->ValueType->GetRegType() == REGT_INT)
{
if (basex->ValueType != TypeName)
{
FxExpression *x = basex;
basex = NULL;
delete this;
return x;
}
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, ScriptPosition);
delete this;
return x;
}
}
else if (basex->ValueType->GetRegType() == REGT_FLOAT)
{
if (basex->isConstant())
{
ExpVal constval = static_cast<FxConstant *>(basex)->GetValue();
FxExpression *x = new FxConstant(constval.GetInt(), ScriptPosition);
if (!NoWarn && 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_WARNING, "Truncation of floating point value");
}
return this;
}
ScriptPosition.Message(MSG_ERROR, "Numeric type expected");
delete this;
return NULL;
}
//==========================================================================
//
//
//
//==========================================================================
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, CAST_F2I);
return to;
}
//==========================================================================
//
//
//
//==========================================================================
FxFloatCast::FxFloatCast(FxExpression *x)
: FxExpression(x->ScriptPosition)
{
basex = x;
ValueType = TypeFloat64;
}
//==========================================================================
//
//
//
//==========================================================================
FxFloatCast::~FxFloatCast()
{
SAFE_DELETE(basex);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxFloatCast::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(basex, ctx);
if (basex->ValueType->GetRegType() == REGT_FLOAT)
{
FxExpression *x = basex;
basex = NULL;
delete this;
return x;
}
else if (basex->ValueType->GetRegType() == REGT_INT)
{
if (basex->ValueType != TypeName)
{
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 NULL;
}
}
//==========================================================================
//
//
//
//==========================================================================
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, CAST_I2F);
return to;
}
//==========================================================================
//
//
//
//==========================================================================
FxNameCast::FxNameCast(FxExpression *x)
: FxExpression(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 = NULL;
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 NULL;
}
}
//==========================================================================
//
//
//
//==========================================================================
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(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 = NULL;
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 NULL;
}
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxStringCast::Emit(VMFunctionBuilder *build)
{
ExpEmit from = basex->Emit(build);
assert(!from.Konst);
from.Free(build);
ExpEmit to(build, REGT_STRING);
if (ValueType == TypeName)
{
build->Emit(OP_CAST, to.RegNum, from.RegNum, CAST_N2S);
}
else if (ValueType == TypeSound)
{
build->Emit(OP_CAST, to.RegNum, from.RegNum, CAST_So2S);
}
return to;
}
//==========================================================================
//
//
//
//==========================================================================
FxColorCast::FxColorCast(FxExpression *x)
: FxExpression(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 = NULL;
delete this;
return x;
}
else if (basex->ValueType == TypeString)
{
if (basex->isConstant())
{
ExpVal constval = static_cast<FxConstant *>(basex)->GetValue();
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 NULL;
}
}
//==========================================================================
//
//
//
//==========================================================================
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(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 = NULL;
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 NULL;
}
}
//==========================================================================
//
//
//
//==========================================================================
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)
: FxExpression(x->ScriptPosition)
{
basex = x;
ValueType = type;
}
//==========================================================================
//
//
//
//==========================================================================
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)
{
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 (ValueType->GetRegType() == REGT_FLOAT)
{
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);
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 == TypeState)
{
// 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))
{
FxExpression *x = new FxMultiNameState(static_cast<FxConstant *>(basex)->GetValue().GetString(), basex->ScriptPosition);
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 (ValueType->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.
if (basex->ValueType->IsKindOf(RUNTIME_CLASS(PPointer)))
{
auto fromtype = static_cast<PPointer *>(basex->ValueType);
auto totype = static_cast<PPointer *>(ValueType);
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 (fromcls->IsDescendantOf(tocls)) 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;
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(operand->ScriptPosition)
{
Operand=operand;
}
//==========================================================================
//
//
//
//==========================================================================
FxPlusSign::~FxPlusSign()
{
SAFE_DELETE(Operand);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxPlusSign::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(Operand, ctx);
if (Operand->IsNumeric())
{
FxExpression *e = Operand;
Operand = NULL;
delete this;
return e;
}
else
{
ScriptPosition.Message(MSG_ERROR, "Numeric type expected");
delete this;
return NULL;
}
}
ExpEmit FxPlusSign::Emit(VMFunctionBuilder *build)
{
return Operand->Emit(build);
}
//==========================================================================
//
//
//
//==========================================================================
FxMinusSign::FxMinusSign(FxExpression *operand)
: FxExpression(operand->ScriptPosition)
{
Operand=operand;
}
//==========================================================================
//
//
//
//==========================================================================
FxMinusSign::~FxMinusSign()
{
SAFE_DELETE(Operand);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxMinusSign::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(Operand, ctx);
if (Operand->IsNumeric())
{
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 NULL;
}
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxMinusSign::Emit(VMFunctionBuilder *build)
{
assert(ValueType == Operand->ValueType);
ExpEmit from = Operand->Emit(build);
assert(from.Konst == 0);
// Do it in-place.
if (ValueType->GetRegType() == REGT_INT)
{
build->Emit(OP_NEG, from.RegNum, from.RegNum, 0);
}
else
{
assert(ValueType->GetRegType() == REGT_FLOAT);
build->Emit(OP_FLOP, from.RegNum, from.RegNum, FLOP_NEG);
}
return from;
}
//==========================================================================
//
//
//
//==========================================================================
FxUnaryNotBitwise::FxUnaryNotBitwise(FxExpression *operand)
: FxExpression(operand->ScriptPosition)
{
Operand=operand;
}
//==========================================================================
//
//
//
//==========================================================================
FxUnaryNotBitwise::~FxUnaryNotBitwise()
{
SAFE_DELETE(Operand);
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxUnaryNotBitwise::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(Operand, ctx);
if (Operand->ValueType->GetRegType() == REGT_FLOAT /* lax */)
{
// DECORATE allows floats here so cast them to int.
Operand = new FxIntCast(Operand, ctx.FromDecorate);
Operand = Operand->Resolve(ctx);
if (Operand == NULL)
{
delete this;
return NULL;
}
}
if (Operand->ValueType->GetRegType() != REGT_INT)
{
ScriptPosition.Message(MSG_ERROR, "Integer type expected");
delete this;
return NULL;
}
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(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 == ValueType);
assert(ValueType == TypeBool);
ExpEmit from = Operand->Emit(build);
assert(!from.Konst);
// ~x & 1
build->Emit(OP_NOT, from.RegNum, from.RegNum, 0);
build->Emit(OP_AND_RK, from.RegNum, from.RegNum, build->GetConstantInt(1));
return from;
}
//==========================================================================
//
//
//
//==========================================================================
FxSizeAlign::FxSizeAlign(FxExpression *operand, int which)
: FxExpression(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 == 'a'? "alignment" : "size");
delete this;
return NULL;
}
else if (!Operand->RequestAddress(nullptr))
{
ScriptPosition.Message(MSG_ERROR, "Operand must be addressable to determine %s", Which == 'a' ? "alignment" : "size");
delete this;
return NULL;
}
else
{
FxExpression *x = new FxConstant(Which == 'a' ? 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(base->ScriptPosition), Base(base), Token(token)
{
AddressRequested = false;
AddressWritable = false;
}
FxPreIncrDecr::~FxPreIncrDecr()
{
SAFE_DELETE(Base);
}
bool FxPreIncrDecr::RequestAddress(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(&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(build, regtype);
build->Emit(ValueType->GetLoadOp(), value.RegNum, pointer.RegNum, zero);
if (regtype == REGT_INT)
{
build->Emit((Token == TK_Incr) ? OP_ADD_RK : OP_SUB_RK, value.RegNum, value.RegNum, build->GetConstantInt(1));
}
else
{
build->Emit((Token == TK_Incr) ? OP_ADDF_RK : OP_SUBF_RK, value.RegNum, value.RegNum, build->GetConstantFloat(1.));
}
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(base->ScriptPosition), Base(base), Token(token)
{
}
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(&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);
ExpEmit out(build, regtype);
build->Emit(ValueType->GetLoadOp(), out.RegNum, pointer.RegNum, zero);
ExpEmit assign(build, regtype);
if (regtype == REGT_INT)
{
build->Emit((Token == TK_Incr) ? OP_ADD_RK : OP_SUB_RK, assign.RegNum, out.RegNum, build->GetConstantInt(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;
}
//==========================================================================
//
// FxAssign
//
//==========================================================================
FxAssign::FxAssign(FxExpression *base, FxExpression *right)
: FxExpression(base->ScriptPosition), Base(base), Right(right)
{
AddressRequested = false;
AddressWritable = false;
}
FxAssign::~FxAssign()
{
SAFE_DELETE(Base);
SAFE_DELETE(Right);
}
bool FxAssign::RequestAddress(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 (!Base->IsNumeric() || !Right->IsNumeric())
{
ScriptPosition.Message(MSG_ERROR, "Numeric type expected");
delete this;
return nullptr;
}
if (!Base->RequestAddress(&AddressWritable) || !AddressWritable)
{
ScriptPosition.Message(MSG_ERROR, "Expression must be a modifiable value");
delete this;
return nullptr;
}
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);
}
return this;
}
ExpEmit FxAssign::Emit(VMFunctionBuilder *build)
{
assert(ValueType == Base->ValueType && IsNumeric());
assert(ValueType->GetRegType() == Right->ValueType->GetRegType());
ExpEmit pointer = Base->Emit(build);
Address = pointer;
ExpEmit result = Right->Emit(build);
if (result.Konst)
{
ExpEmit temp(build, result.RegType);
build->Emit(result.RegType == REGT_FLOAT ? OP_LKF : OP_LK, temp.RegNum, result.RegNum);
result.Free(build);
result = temp;
}
build->Emit(ValueType->GetStoreOp(), pointer.RegNum, result.RegNum, build->GetConstantInt(0));
if (AddressRequested)
{
result.Free(build);
return pointer;
}
pointer.Free(build);
return result;
}
//==========================================================================
//
// FxAssignSelf
//
//==========================================================================
FxAssignSelf::FxAssignSelf(const FScriptPosition &pos)
: FxExpression(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
ExpEmit out(build, ValueType->GetRegType());
build->Emit(ValueType->GetLoadOp(), out.RegNum, pointer.RegNum, build->GetConstantInt(0));
return out;
}
//==========================================================================
//
//
//
//==========================================================================
FxBinary::FxBinary(int o, FxExpression *l, FxExpression *r)
: FxExpression(l->ScriptPosition)
{
Operator=o;
left=l;
right=r;
}
//==========================================================================
//
//
//
//==========================================================================
FxBinary::~FxBinary()
{
SAFE_DELETE(left);
SAFE_DELETE(right);
}
//==========================================================================
//
//
//
//==========================================================================
bool FxBinary::ResolveLR(FCompileContext& ctx, bool castnumeric)
{
RESOLVE(left, ctx);
RESOLVE(right, ctx);
if (!left || !right)
{
delete this;
return false;
}
if (left->ValueType == TypeBool && right->ValueType == TypeBool)
{
ValueType = TypeBool;
}
else if (left->IsNumeric() && right->IsNumeric())
{
if (left->ValueType->GetRegType() == REGT_INT && right->ValueType->GetRegType() == REGT_INT)
{
ValueType = TypeSInt32;
}
else
{
ValueType = TypeFloat64;
}
}
else if (left->ValueType->GetRegType() == REGT_POINTER && left->ValueType == right->ValueType)
{
ValueType = left->ValueType;
}
else
{
ValueType = TypeVoid;
}
if (castnumeric)
{
// later!
}
return true;
}
void FxBinary::Promote(FCompileContext &ctx)
{
if (left->ValueType->GetRegType() == REGT_FLOAT && right->ValueType->GetRegType() == REGT_INT)
{
right = (new FxFloatCast(right))->Resolve(ctx);
}
else if (left->ValueType->GetRegType() == REGT_INT && right->ValueType->GetRegType() == REGT_FLOAT)
{
left = (new FxFloatCast(left))->Resolve(ctx);
}
}
//==========================================================================
//
//
//
//==========================================================================
FxAddSub::FxAddSub(int o, FxExpression *l, FxExpression *r)
: FxBinary(o, l, r)
{
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxAddSub::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
if (!ResolveLR(ctx, true)) return NULL;
if (!IsNumeric())
{
ScriptPosition.Message(MSG_ERROR, "Numeric type expected");
delete this;
return NULL;
}
else if (left->isConstant() && right->isConstant())
{
if (ValueType->GetRegType() == REGT_FLOAT)
{
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;
}
}
Promote(ctx);
return this;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxAddSub::Emit(VMFunctionBuilder *build)
{
assert(Operator == '+' || Operator == '-');
ExpEmit op1 = left->Emit(build);
ExpEmit op2 = right->Emit(build);
if (Operator == '+')
{
// 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);
if (ValueType->GetRegType() == REGT_FLOAT)
{
assert(op1.RegType == REGT_FLOAT && op2.RegType == REGT_FLOAT);
ExpEmit to(build, 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);
ExpEmit to(build, 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);
if (ValueType->GetRegType() == REGT_FLOAT)
{
assert(op1.RegType == REGT_FLOAT && op2.RegType == REGT_FLOAT);
ExpEmit to(build, 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);
ExpEmit to(build, 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();
if (!ResolveLR(ctx, true)) return NULL;
if (!IsNumeric())
{
ScriptPosition.Message(MSG_ERROR, "Numeric type expected");
delete this;
return NULL;
}
else if (left->isConstant() && right->isConstant())
{
if (ValueType->GetRegType() == REGT_FLOAT)
{
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 NULL;
}
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 NULL;
}
v = Operator == '*'? v1 * v2 :
Operator == '/'? v1 / v2 :
Operator == '%'? v1 % v2 : 0;
FxExpression *e = new FxConstant(v, ScriptPosition);
delete this;
return e;
}
}
Promote(ctx);
return this;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxMulDiv::Emit(VMFunctionBuilder *build)
{
ExpEmit op1 = left->Emit(build);
ExpEmit op2 = right->Emit(build);
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);
if (ValueType->GetRegType() == REGT_FLOAT)
{
assert(op1.RegType == REGT_FLOAT && op2.RegType == REGT_FLOAT);
ExpEmit to(build, 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);
ExpEmit to(build, 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);
if (ValueType->GetRegType() == REGT_FLOAT)
{
assert(op1.RegType == REGT_FLOAT && op2.RegType == REGT_FLOAT);
ExpEmit to(build, 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);
ExpEmit to(build, REGT_INT);
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();
if (!ResolveLR(ctx, true)) return NULL;
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();
if (!ResolveLR(ctx, true)) return NULL;
if (!IsNumeric())
{
ScriptPosition.Message(MSG_ERROR, "Numeric type expected");
delete this;
return NULL;
}
else if (left->isConstant() && right->isConstant())
{
int v;
if (ValueType->GetRegType() == REGT_FLOAT)
{
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
{
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;
}
Promote(ctx);
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.RegType == REGT_INT || op1.RegType == REGT_FLOAT);
assert(!op1.Konst || !op2.Konst);
assert(Operator == '<' || Operator == '>' || Operator == TK_Geq || Operator == TK_Leq);
static const VM_UBYTE InstrMap[][4] =
{
{ OP_LT_RR, OP_LTF_RR, 0 }, // <
{ OP_LE_RR, OP_LEF_RR, 1 }, // >
{ OP_LT_RR, OP_LTF_RR, 1 }, // >=
{ OP_LE_RR, OP_LEF_RR, 0 } // <=
};
int instr, check, index;
ExpEmit to(build, REGT_INT);
index = Operator == '<' ? 0 :
Operator == '>' ? 1 :
Operator == TK_Geq ? 2 : 3;
instr = InstrMap[index][op1.RegType == REGT_INT ? 0 : 1];
check = InstrMap[index][2];
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();
if (!ResolveLR(ctx, true)) return NULL;
if (!left || !right)
{
delete this;
return NULL;
}
if (!IsNumeric() && !IsPointer())
{
ScriptPosition.Message(MSG_ERROR, "Numeric type expected");
delete this;
return NULL;
}
if (left->isConstant() && right->isConstant())
{
int v;
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 : v1 != v2;
}
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;
}
Promote(ctx);
ValueType = TypeBool;
return this;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxCompareEq::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 || op1.RegType == REGT_POINTER);
int instr;
// Only the second operand may be constant.
if (op1.Konst)
{
swapvalues(op1, op2);
}
assert(!op1.Konst);
ExpEmit to(build, REGT_INT);
instr = op1.RegType == REGT_INT ? OP_EQ_R :
op1.RegType == REGT_FLOAT ? OP_EQF_R :
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_Eq, op1.RegNum, op2.RegNum);
build->Emit(OP_JMP, 1);
build->Emit(OP_LI, to.RegNum, 1);
return to;
}
//==========================================================================
//
//
//
//==========================================================================
FxBinaryInt::FxBinaryInt(int o, FxExpression *l, FxExpression *r)
: FxBinary(o, l, r)
{
ValueType = TypeSInt32;
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxBinaryInt::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
if (!ResolveLR(ctx, false)) return NULL;
if (ValueType->GetRegType() == REGT_FLOAT && ctx.FromDecorate)
{
// For DECORATE which allows floats here. ZScript does not.
if (left->ValueType->GetRegType() != REGT_INT)
{
left = new FxIntCast(left, ctx.FromDecorate);
left = left->Resolve(ctx);
}
if (right->ValueType->GetRegType() != REGT_INT)
{
right = new FxIntCast(right, ctx.FromDecorate);
right = right->Resolve(ctx);
}
if (left == NULL || right == NULL)
{
delete this;
return NULL;
}
ValueType = TypeSInt32;
}
if (ValueType->GetRegType() != REGT_INT)
{
ScriptPosition.Message(MSG_ERROR, "Integer type expected");
delete this;
return NULL;
}
else 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) :
Operator == '&'? v1 & v2 :
Operator == '|'? v1 | v2 :
Operator == '^'? v1 ^ v2 : 0, ScriptPosition);
delete this;
return e;
}
return this;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxBinaryInt::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
{ OP_AND_RR, 0, OP_AND_RK }, // '&'
{ OP_OR_RR, 0, OP_OR_RK }, // '|'
{ OP_XOR_RR, 0, OP_XOR_RK }, // '^'
};
int index, instr, rop;
ExpEmit op1, op2;
index = Operator == TK_LShift ? 0 :
Operator == TK_RShift ? 1 :
Operator == TK_URShift ? 2 :
Operator == '&' ? 3 :
Operator == '|' ? 4 :
Operator == '^' ? 5 : -1;
assert(index >= 0);
op1 = left->Emit(build);
if (index < 3)
{ // 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;
}
}
else
{ // The other operators only take a constant on the right-hand side.
op2 = right->Emit(build);
if (op1.Konst)
{
swapvalues(op1, op2);
}
assert(!op1.Konst);
rop = op2.RegNum;
op2.Free(build);
}
if (!op1.Konst)
{
op1.Free(build);
if (!op2.Konst)
{
instr = InstrMap[index][0];
}
else
{
instr = InstrMap[index][2];
}
}
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;
}
//==========================================================================
//
//
//
//==========================================================================
FxBinaryLogical::FxBinaryLogical(int o, FxExpression *l, FxExpression *r)
: FxExpression(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=NULL;
delete this;
return x;
}
else if (b_right==1)
{
FxExpression *x = left;
left=NULL;
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=NULL;
delete this;
return x;
}
else if (b_right==0)
{
FxExpression *x = left;
left=NULL;
delete this;
return x;
}
}
return this;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxBinaryLogical::Emit(VMFunctionBuilder *build)
{
// This is not the "right" way to do these, but it works for now.
// (Problem: No information sharing is done between nodes to reduce the
// code size if you have something like a1 && a2 && a3 && ... && an.)
assert(left->ValueType->GetRegType() == REGT_INT && right->ValueType->GetRegType() == REGT_INT);
ExpEmit op1 = left->Emit(build);
assert(!op1.Konst);
int zero = build->GetConstantInt(0);
op1.Free(build);
if (Operator == TK_AndAnd)
{
build->Emit(OP_EQ_K, 1, op1.RegNum, zero);
// If op1 is 0, skip evaluation of op2.
size_t patchspot = build->Emit(OP_JMP, 0, 0, 0);
// Evaluate op2.
ExpEmit op2 = right->Emit(build);
assert(!op2.Konst);
op2.Free(build);
ExpEmit to(build, REGT_INT);
build->Emit(OP_EQ_K, 1, op2.RegNum, zero);
build->Emit(OP_JMP, 2);
build->Emit(OP_LI, to.RegNum, 1);
build->Emit(OP_JMP, 1);
size_t target = build->Emit(OP_LI, to.RegNum, 0);
build->Backpatch(patchspot, target);
return to;
}
else
{
assert(Operator == TK_OrOr);
build->Emit(OP_EQ_K, 0, op1.RegNum, zero);
// If op1 is not 0, skip evaluation of op2.
size_t patchspot = build->Emit(OP_JMP, 0, 0, 0);
// Evaluate op2.
ExpEmit op2 = right->Emit(build);
assert(!op2.Konst);
op2.Free(build);
ExpEmit to(build, REGT_INT);
build->Emit(OP_EQ_K, 0, op2.RegNum, zero);
build->Emit(OP_JMP, 2);
build->Emit(OP_LI, to.RegNum, 0);
build->Emit(OP_JMP, 1);
size_t target = build->Emit(OP_LI, to.RegNum, 1);
build->Backpatch(patchspot, target);
return to;
}
}
//==========================================================================
//
//
//
//==========================================================================
FxConditional::FxConditional(FxExpression *c, FxExpression *t, FxExpression *f)
: FxExpression(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 == TypeBool && falsex->ValueType == TypeBool)
ValueType = TypeBool;
else if (truex->ValueType->GetRegType() == REGT_INT && falsex->ValueType->GetRegType() == REGT_INT)
ValueType = TypeSInt32;
else if (truex->IsNumeric() && falsex->IsNumeric())
ValueType = TypeFloat64;
//else if (truex->ValueType != falsex->ValueType)
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 = NULL;
delete this;
return e;
}
if (ValueType->GetRegType() == REGT_FLOAT)
{
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);
// 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)
{
assert(trueop.RegType == REGT_FLOAT);
out = ExpEmit(build, REGT_FLOAT);
build->Emit(OP_LKF, 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)
{
assert(falseop.RegType == REGT_FLOAT);
build->Emit(OP_LKF, out.RegNum, falseop.RegNum);
}
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);
if (falseop.RegType == REGT_INT)
{
build->Emit(OP_MOVE, out.RegNum, falseop.RegNum, 0);
}
else
{
assert(falseop.RegType == REGT_FLOAT);
build->Emit(OP_MOVEF, out.RegNum, falseop.RegNum, 0);
}
}
}
build->BackpatchToHere(truejump);
return out;
}
//==========================================================================
//
//
//
//==========================================================================
FxAbs::FxAbs(FxExpression *v)
: FxExpression(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 NULL;
}
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 NULL;
}
FxExpression *x = new FxConstant(value, ScriptPosition);
delete this;
return x;
}
ValueType = val->ValueType;
return this;
}
//==========================================================================
//
//
//
//==========================================================================
ExpEmit FxAbs::Emit(VMFunctionBuilder *build)
{
ExpEmit absofsteal = val->Emit(build);
assert(!absofsteal.Konst);
ExpEmit out(build, absofsteal.RegType);
if (absofsteal.RegType == REGT_INT)
{
build->Emit(OP_ABS, out.RegNum, absofsteal.RegNum, 0);
}
else
{
assert(absofsteal.RegType == REGT_FLOAT);
build->Emit(OP_FLOP, out.RegNum, absofsteal.RegNum, FLOP_ABS);
}
return out;
}
//==========================================================================
//
//
//
//==========================================================================
FxATan2::FxATan2(FxExpression *y, FxExpression *x, const FScriptPosition &pos)
: FxExpression(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 NULL;
}
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(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];
}
}
//==========================================================================
//
//
//
//==========================================================================
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]->ValueType->GetRegType() == REGT_FLOAT)
{
floatcount++;
}
else if (choices[i]->ValueType->GetRegType() == REGT_INT && choices[i]->ValueType != TypeName)
{
intcount++;
}
else
{
ScriptPosition.Message(MSG_ERROR, "Arguments must be of type int or float");
delete this;
return NULL;
}
}
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] = NULL;
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, opA;
assert(choices.Size() > 0);
assert(OP_LTF_RK == OP_LTF_RR+1);
assert(OP_LT_RK == OP_LT_RR+1);
assert(OP_LEF_RK == OP_LEF_RR+1);
assert(OP_LE_RK == OP_LE_RR+1);
if (Type == NAME_Min)
{
opcode = ValueType->GetRegType() == REGT_FLOAT ? OP_LEF_RR : OP_LE_RR;
opA = 1;
}
else
{
opcode = ValueType->GetRegType() == REGT_FLOAT ? OP_LTF_RR : OP_LT_RR;
opA = 0;
}
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, opA, bestreg.RegNum, checkreg.RegNum);
build->Emit(OP_JMP, 1);
if (checkreg.Konst)
{
build->Emit(bestreg.RegType == REGT_FLOAT ? OP_LKF : OP_LK, bestreg.RegNum, checkreg.RegNum);
}
else
{
build->Emit(bestreg.RegType == REGT_FLOAT ? OP_MOVEF : OP_MOVE, bestreg.RegNum, checkreg.RegNum, 0);
checkreg.Free(build);
}
}
return bestreg;
}
//==========================================================================
//
//
//
//==========================================================================
FxRandom::FxRandom(FRandom * r, FxExpression *mi, FxExpression *ma, const FScriptPosition &pos, bool nowarn)
: FxExpression(pos)
{
EmitTail = false;
if (mi != NULL && ma != NULL)
{
min = new FxIntCast(mi, nowarn);
max = new FxIntCast(ma, nowarn);
}
else min = max = NULL;
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 DecoRandom(VMFrameStack *stack, VMValue *param, 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 = FindDecorateBuiltinFunction(NAME_DecoRandom, DecoRandom);
assert(sym->IsKindOf(RUNTIME_CLASS(PSymbolVMFunction)));
assert(((PSymbolVMFunction *)sym)->Function != NULL);
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 != NULL && max != NULL)
{
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(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]);
}
else
{
choices[index] = new FxIntCast(expr[index], nowarn);
}
}
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 DecoRandom to generate a random number.
VMFunction *callfunc;
PSymbol *sym = FindDecorateBuiltinFunction(NAME_DecoRandom, DecoRandom);
assert(sym->IsKindOf(RUNTIME_CLASS(PSymbolVMFunction)));
assert(((PSymbolVMFunction *)sym)->Function != NULL);
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);
return resultreg;
}
//==========================================================================
//
//
//
//==========================================================================
FxFRandom::FxFRandom(FRandom *r, FxExpression *mi, FxExpression *ma, const FScriptPosition &pos)
: FxRandom(r, NULL, NULL, pos, true)
{
if (mi != NULL && ma != NULL)
{
min = new FxFloatCast(mi);
max = new FxFloatCast(ma);
}
ValueType = TypeFloat64;
}
//==========================================================================
//
//
//
//==========================================================================
int DecoFRandom(VMFrameStack *stack, VMValue *param, 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 DecoFRandom function to generate a floating point random number..
VMFunction *callfunc;
PSymbol *sym = FindDecorateBuiltinFunction(NAME_DecoFRandom, DecoFRandom);
assert(sym->IsKindOf(RUNTIME_CLASS(PSymbolVMFunction)));
assert(((PSymbolVMFunction *)sym)->Function != NULL);
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 != NULL && max != NULL)
{
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(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 DecoRandom function to generate the random number.
VMFunction *callfunc;
PSymbol *sym = FindDecorateBuiltinFunction(NAME_DecoRandom, DecoRandom);
assert(sym->IsKindOf(RUNTIME_CLASS(PSymbolVMFunction)));
assert(((PSymbolVMFunction *)sym)->Function != NULL);
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(pos)
{
Identifier = name;
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxIdentifier::Resolve(FCompileContext& ctx)
{
PSymbol * sym;
FxExpression *newex = nullptr;
int num;
CHECKRESOLVED();
// 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;
if ((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);
}
else if (sym->IsKindOf(RUNTIME_CLASS(PField)))
{
ABORT(ctx.Function); // only valid when resolving a function.
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)
{
ScriptPosition.Message(MSG_WARNING, "Accessing deprecated member variable %s", vsym->SymbolName.GetChars());
}
if ((vsym->Flags & VARF_Private) && symtbl != &ctx.Class->Symbols)
{
ScriptPosition.Message(MSG_ERROR, "Private member %s not accessible", vsym->SymbolName.GetChars());
delete this;
return nullptr;
}
if (vsym->Flags & VARF_Static)
{
// todo. For now these cannot be defined so let's just exit.
delete this;
return nullptr;
}
if (ctx.Function->Variants[0].SelfClass == nullptr)
{
ScriptPosition.Message(MSG_ERROR, "Unable to access class member from static function");
delete this;
return nullptr;
}
else
{
if (ctx.Function->Variants[0].SelfClass != ctx.Class)
{
// Check if the restricted class can access it.
PSymbol *sym2;
if ((sym2 = ctx.FindInSelfClass(Identifier, symtbl)) != nullptr)
{
if (sym != sym2)
{
ScriptPosition.Message(MSG_ERROR, "Member variable of %s not accessible through restricted self pointer", ctx.Class->TypeName.GetChars());
delete this;
return nullptr;
}
}
}
ScriptPosition.Message(MSG_DEBUGLOG, "Resolving name '%s' as member variable, index %d\n", Identifier.GetChars(), vsym->Offset);
newex = new FxClassMember((new FxSelf(ScriptPosition))->Resolve(ctx), vsym, ScriptPosition);
}
}
else
{
ScriptPosition.Message(MSG_ERROR, "Invalid member identifier '%s'\n", Identifier.GetChars());
}
}
// now check the global identifiers.
else if ((sym = ctx.FindGlobal(Identifier)) != NULL)
{
if (sym->IsKindOf(RUNTIME_CLASS(PSymbolConst)))
{
ScriptPosition.Message(MSG_DEBUGLOG, "Resolving name '%s' as global constant\n", Identifier.GetChars());
newex = FxConstant::MakeConstant(sym, ScriptPosition);
}
else
{
ScriptPosition.Message(MSG_ERROR, "Invalid global identifier '%s'\n", Identifier.GetChars());
}
}
// and line specials
else if ((num = P_FindLineSpecial(Identifier, NULL, NULL)))
{
ScriptPosition.Message(MSG_DEBUGLOG, "Resolving name '%s' as line special %d\n", Identifier.GetChars(), num);
newex = new FxConstant(num, ScriptPosition);
}
else
{
ScriptPosition.Message(MSG_ERROR, "Unknown identifier '%s'", Identifier.GetChars());
newex = new FxConstant(0, ScriptPosition);
}
delete this;
return newex? newex->Resolve(ctx) : NULL;
}
//==========================================================================
//
//
//
//==========================================================================
FxSelf::FxSelf(const FScriptPosition &pos)
: FxExpression(pos)
{
}
//==========================================================================
//
//
//
//==========================================================================
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)
{
// self is always the first pointer passed to the function
ExpEmit me(0, REGT_POINTER);
me.Fixed = true;
return me;
}
//==========================================================================
//
//
//
//==========================================================================
FxClassMember::FxClassMember(FxExpression *x, PField* mem, const FScriptPosition &pos)
: FxExpression(pos)
{
classx = x;
membervar = mem;
AddressRequested = false;
//if (classx->IsDefaultObject()) Readonly=true;
}
//==========================================================================
//
//
//
//==========================================================================
FxClassMember::~FxClassMember()
{
SAFE_DELETE(classx);
}
//==========================================================================
//
//
//
//==========================================================================
bool FxClassMember::RequestAddress(bool *writable)
{
AddressRequested = true;
if (writable != nullptr) *writable = !(membervar->Flags & VARF_ReadOnly);
return true;
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxClassMember::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(classx, ctx);
PPointer *ptrtype = dyn_cast<PPointer>(classx->ValueType);
if (ptrtype == NULL || !ptrtype->IsKindOf(RUNTIME_CLASS(DObject)))
{
ScriptPosition.Message(MSG_ERROR, "Member variable requires a class or object");
delete this;
return NULL;
}
ValueType = membervar->Type;
return this;
}
ExpEmit FxClassMember::Emit(VMFunctionBuilder *build)
{
if (build->IsActionFunc && ~membervar->Flags & VARF_Native)
{ // Check if this is a user-defined variable.
// As of right now, FxClassMember is only ever used with FxSelf.
// This very user variable was defined in stateowner so if
// self (a0) != stateowner (a1) then the offset is most likely
// going to end up being totally wrong even if the variable was
// redefined in self which means we have to abort to avoid reading
// or writing to a random address and possibly crash.
build->Emit(OP_EQA_R, 1, 0, 1);
build->Emit(OP_JMP, 1);
build->Emit(OP_THROW, 2, X_BAD_SELF);
}
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 (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());
build->Emit(membervar->Type->GetLoadOp(), loc.RegNum, obj.RegNum, offsetreg);
obj.Free(build);
return loc;
}
//==========================================================================
//
//
//
//==========================================================================
FxArrayElement::FxArrayElement(FxExpression *base, FxExpression *_index)
:FxExpression(base->ScriptPosition)
{
Array=base;
index = _index;
AddressRequested = false;
AddressWritable = false;
}
//==========================================================================
//
//
//
//==========================================================================
FxArrayElement::~FxArrayElement()
{
SAFE_DELETE(Array);
SAFE_DELETE(index);
}
//==========================================================================
//
//
//
//==========================================================================
bool FxArrayElement::RequestAddress(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 == NULL)
{
delete this;
return NULL;
}
}
if (index->ValueType->GetRegType() != REGT_INT && index->ValueType != TypeName)
{
ScriptPosition.Message(MSG_ERROR, "Array index must be integer");
delete this;
return NULL;
}
PArray *arraytype = dyn_cast<PArray>(Array->ValueType);
if (arraytype == NULL)
{
ScriptPosition.Message(MSG_ERROR, "'[]' can only be used with arrays.");
delete this;
return NULL;
}
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 NULL;
}
}
ValueType = arraytype->ElementType;
if (ValueType->GetRegType() != REGT_INT && ValueType->GetRegType() != REGT_FLOAT)
{
// int arrays only for now
ScriptPosition.Message(MSG_ERROR, "Only numeric arrays are supported.");
delete this;
return NULL;
}
if (!Array->RequestAddress(&AddressWritable))
{
ScriptPosition.Message(MSG_ERROR, "Unable to dereference array.");
delete this;
return NULL;
}
return this;
}
//==========================================================================
//
// in its current state this won't be able to do more than handle the args array.
//
//==========================================================================
ExpEmit FxArrayElement::Emit(VMFunctionBuilder *build)
{
ExpEmit start = Array->Emit(build);
PArray *const arraytype = static_cast<PArray*>(Array->ValueType);
ExpEmit dest(build, arraytype->ElementType->GetRegType());
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");
indexval *= arraytype->ElementSize;
if (AddressRequested)
{
if (indexval != 0)
{
build->Emit(OP_ADDA_RK, start.RegNum, start.RegNum, build->GetConstantInt(indexval));
}
}
else
{
build->Emit(arraytype->ElementType->GetLoadOp(), dest.RegNum,
start.RegNum, build->GetConstantInt(indexval));
}
}
else
{
ExpEmit indexv(index->Emit(build));
int shiftbits = 0;
while (1u << shiftbits < arraytype->ElementSize)
{
shiftbits++;
}
assert(1u << shiftbits == arraytype->ElementSize && "Element sizes other than power of 2 are not implemented");
build->Emit(OP_BOUND, indexv.RegNum, arraytype->ElementCount);
if (shiftbits > 0)
{
build->Emit(OP_SLL_RI, indexv.RegNum, indexv.RegNum, shiftbits);
}
if (AddressRequested)
{
build->Emit(OP_ADDA_RR, start.RegNum, start.RegNum, indexv.RegNum);
}
else
{
build->Emit(arraytype->ElementType->GetLoadOp() + 1, // added 1 to use the *_R version that
dest.RegNum, start.RegNum, indexv.RegNum); // takes the offset from a register
}
indexv.Free(build);
}
if (AddressRequested)
{
dest.Free(build);
return start;
}
start.Free(build);
return dest;
}
//==========================================================================
//
//
//
//==========================================================================
FxFunctionCall::FxFunctionCall(FName methodname, FName rngname, FArgumentList *args, const FScriptPosition &pos)
: FxExpression(pos)
{
MethodName = methodname;
RNG = nullptr;
ArgList = 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()
{
SAFE_DELETE(ArgList);
}
//==========================================================================
//
// Check function that gets called
//
//==========================================================================
static bool CheckArgSize(FName fname, FArgumentList *args, int min, int max, FScriptPosition &sc)
{
int s = args ? args->Size() : 0;
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);
PFunction *afd = FindClassMemberFunction(ctx.Class, ctx.Class, MethodName, ScriptPosition);
if (afd != nullptr)
{
auto x = new FxVMFunctionCall(afd, ArgList, ScriptPosition, false);
ArgList = nullptr;
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);
ArgList = nullptr;
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? ArgList->Size() : 0;
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);
ArgList = nullptr;
delete this;
return x->Resolve(ctx);
}
// Last but not least: Check builtins. 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_Random:
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);
for (auto &i : *ArgList) i = nullptr;
}
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);
for (auto &i : *ArgList) i = nullptr;
}
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(*ArgList, 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:
break;
}
if (func != nullptr)
{
delete this;
return func->Resolve(ctx);
}
ScriptPosition.Message(MSG_ERROR, "Call to unknown function '%s'", MethodName.GetChars());
delete this;
return nullptr;
}
//==========================================================================
//
// 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(pos)
{
Self = self;
Special = special;
ArgList = args;
EmitTail = false;
}
//==========================================================================
//
//
//
//==========================================================================
FxActionSpecialCall::~FxActionSpecialCall()
{
SAFE_DELETE(Self);
SAFE_DELETE(ArgList);
}
//==========================================================================
//
//
//
//==========================================================================
PPrototype *FxActionSpecialCall::ReturnProto()
{
EmitTail = true;
return FxExpression::ReturnProto();
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxActionSpecialCall::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
bool failed = false;
SAFE_RESOLVE_OPT(Self, ctx);
if (ArgList != NULL)
{
for (unsigned i = 0; i < ArgList->Size(); i++)
{
(*ArgList)[i] = (*ArgList)[i]->Resolve(ctx);
if ((*ArgList)[i] == NULL) failed = true;
if (Special < 0 && i == 0)
{
if ((*ArgList)[i]->ValueType != TypeName)
{
ScriptPosition.Message(MSG_ERROR, "Name expected for parameter %d", i);
failed = true;
}
}
else if ((*ArgList)[i]->ValueType->GetRegType() != REGT_INT)
{
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 NULL;
}
}
ValueType = TypeSInt32;
return this;
}
//==========================================================================
//
//
//
//==========================================================================
int DecoCallLineSpecial(VMFrameStack *stack, VMValue *param, 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, NULL, 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
if (ArgList != NULL)
{
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 DecoCallLineSpecial function to perform the desired special.
VMFunction *callfunc;
PSymbol *sym = FindDecorateBuiltinFunction(NAME_DecoCallLineSpecial, DecoCallLineSpecial);
assert(sym->IsKindOf(RUNTIME_CLASS(PSymbolVMFunction)));
assert(((PSymbolVMFunction *)sym)->Function != NULL);
callfunc = ((PSymbolVMFunction *)sym)->Function;
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(PFunction *func, FArgumentList *args, const FScriptPosition &pos, bool ownerisself)
: FxExpression(pos)
{
Function = func;
ArgList = args;
EmitTail = false;
OwnerIsSelf = ownerisself;
}
//==========================================================================
//
//
//
//==========================================================================
FxVMFunctionCall::~FxVMFunctionCall()
{
SAFE_DELETE(ArgList);
}
//==========================================================================
//
//
//
//==========================================================================
PPrototype *FxVMFunctionCall::ReturnProto()
{
EmitTail = true;
return Function->Variants[0].Proto;
}
//==========================================================================
//
//
//
//==========================================================================
VMFunction *FxVMFunctionCall::GetDirectFunction()
{
// If this return statement calls a 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 ? ArgList->Size() : 0) == 0 && (Function->Variants[0].Flags & VARF_Action))
{
return Function->Variants[0].Implementation;
}
return nullptr;
}
//==========================================================================
//
// FxVMFunctionCall :: Resolve
//
//==========================================================================
FxExpression *FxVMFunctionCall::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
bool failed = false;
auto proto = Function->Variants[0].Proto;
auto argtypes = proto->ArgumentTypes;
int implicit;
if (Function->Variants[0].Flags & VARF_Action) implicit = 3;
else if (Function->Variants[0].Flags & VARF_Method) implicit = 1;
else implicit = 0;
if (ArgList != NULL)
{
for (unsigned i = 0; i < ArgList->Size(); i++)
{
FxExpression *x = new FxTypeCast((*ArgList)[i], argtypes[i + implicit], false);
x = x->Resolve(ctx);
failed |= (x == nullptr);
(*ArgList)[i] = x;
}
}
if (failed)
{
delete this;
return NULL;
}
TArray<PType *> &rets = proto->ReturnTypes;
if (rets.Size() > 0)
{
ValueType = rets[0];
}
else
{
ValueType = TypeVoid;
}
return this;
}
//==========================================================================
//
// Assumption: This call is being generated inside a function whose a0
// register is a self pointer. For action functions, a1 maps to stateowner
// and a2 maps to callingstate. (self, stateowner, callingstate)
//
//==========================================================================
ExpEmit FxVMFunctionCall::Emit(VMFunctionBuilder *build)
{
assert((build->IsActionFunc && build->Registers[REGT_POINTER].GetMostUsed() >= NAP) ||
(!build->IsActionFunc && build->Registers[REGT_POINTER].GetMostUsed() >= 1));
int count = (ArgList ? ArgList->Size() : 0);
if (count == 1)
{
ExpEmit reg;
if (CheckEmitCast(build, EmitTail, reg))
{
return reg;
}
}
// Passing the caller as 'self' is a serious design mistake in DECORATE because it mixes up the types of the two actors involved.
// For ZSCRIPT 'self' is properly used for the state's owning actor, meaning we have to pass the second argument here.
// If both functions are non-action or both are action, there is no need for special treatment.
if (!OwnerIsSelf || (!!(Function->Variants[0].Flags & VARF_Action) == build->IsActionFunc))
{
// Emit code to pass implied parameters
if (Function->Variants[0].Flags & VARF_Method)
{
build->Emit(OP_PARAM, 0, REGT_POINTER, 0);
count += 1;
}
if (Function->Variants[0].Flags & VARF_Action)
{
static_assert(NAP == 3, "This code needs to be updated if NAP changes");
if (build->IsActionFunc)
{
build->Emit(OP_PARAM, 0, REGT_POINTER, 1);
build->Emit(OP_PARAM, 0, REGT_POINTER, 2);
}
else
{
int null = build->GetConstantAddress(nullptr, ATAG_GENERIC);
build->Emit(OP_PARAM, 0, REGT_POINTER | REGT_KONST, null);
build->Emit(OP_PARAM, 0, REGT_POINTER | REGT_KONST, null);
}
count += 2;
}
}
else
{
if (build->IsActionFunc && (Function->Variants[0].Flags & VARF_Method))
{
build->Emit(OP_PARAM, 0, REGT_POINTER, 0);
count += 1;
}
// and calling an action function from a non-action function.
// This must be blocked because it lacks crucial information.
if (!build->IsActionFunc && (Function->Variants[0].Flags & VARF_Action))
{
// This case should be eliminated in the analyzing stage.
I_Error("Cannot call action function from non-action functions.");
}
}
// Emit code to pass explicit parameters
if (ArgList != NULL)
{
for (unsigned i = 0; i < ArgList->Size(); ++i)
{
EmitParameter(build, (*ArgList)[i], ScriptPosition);
}
}
// Get a constant register for this function
VMFunction *vmfunc = Function->Variants[0].Implementation;
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
ExpEmit reg(build, vmfunc->Proto->ReturnTypes[0]->GetRegType());
build->Emit(OP_CALL_K, funcaddr, count, 1);
build->Emit(OP_RESULT, 0, reg.RegType, reg.RegNum);
return reg;
}
else
{ // Call, expecting no results
build->Emit(OP_CALL_K, funcaddr, count, 0);
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_state__ ||
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, where.RegType | (where.Konst ? REGT_KONST : 0), 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(pos)
{
assert(index < countof(FxFlops) && "FLOP index out of range");
Index = (int)index;
ArgList = args;
}
//==========================================================================
//
//
//
//==========================================================================
FxFlopFunctionCall::~FxFlopFunctionCall()
{
SAFE_DELETE(ArgList);
}
FxExpression *FxFlopFunctionCall::Resolve(FCompileContext& ctx)
{
CHECKRESOLVED();
if (ArgList == NULL || ArgList->Size() != 1)
{
ScriptPosition.Message(MSG_ERROR, "%s only has one parameter", FName(FxFlops[Index].Name).GetChars());
delete this;
return NULL;
}
(*ArgList)[0] = (*ArgList)[0]->Resolve(ctx);
if ((*ArgList)[0] == NULL)
{
delete this;
return NULL;
}
if (!(*ArgList)[0]->IsNumeric())
{
ScriptPosition.Message(MSG_ERROR, "numeric value expected for parameter");
delete this;
return NULL;
}
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)
{
ExpEmit v = (*ArgList)[0]->Emit(build);
assert(!v.Konst && v.RegType == REGT_FLOAT);
build->Emit(OP_FLOP, v.RegNum, v.RegNum, FxFlops[Index].Flop);
return v;
}
//==========================================================================
//
// FxSequence :: Resolve
//
//==========================================================================
FxExpression *FxSequence::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
for (unsigned i = 0; i < Expressions.Size(); ++i)
{
if (NULL == (Expressions[i] = Expressions[i]->Resolve(ctx)))
{
delete this;
return NULL;
}
}
return this;
}
//==========================================================================
//
// 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 NULL;
}
//==========================================================================
//
// FxIfStatement
//
//==========================================================================
FxIfStatement::FxIfStatement(FxExpression *cond, FxExpression *true_part,
FxExpression *false_part, const FScriptPosition &pos)
: FxExpression(pos)
{
Condition = cond;
WhenTrue = true_part;
WhenFalse = false_part;
assert(cond != NULL);
}
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;
return nullptr;
}
SAFE_RESOLVE(Condition, ctx);
if (Condition->ValueType != TypeBool)
{
Condition = new FxBoolCast(Condition);
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 = NULL;
if (e == NULL) 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_INT && !cond.Konst);
if (WhenTrue != NULL)
{
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 != NULL);
path1 = WhenFalse;
path2 = NULL;
condcheck = 0;
}
// Test condition.
build->Emit(OP_EQ_K, condcheck, cond.RegNum, build->GetConstantInt(0));
jumpspot = build->Emit(OP_JMP, 0);
cond.Free(build);
// Evaluate first path
v = path1->Emit(build);
v.Free(build);
if (path2 != NULL)
{
size_t path1jump = build->Emit(OP_JMP, 0);
// Evaluate second path
build->BackpatchToHere(jumpspot);
v = path2->Emit(build);
v.Free(build);
jumpspot = path1jump;
}
build->BackpatchToHere(jumpspot);
return ExpEmit();
}
//==========================================================================
//
// FxLoopStatement
//
//==========================================================================
void FxLoopStatement::HandleJumps(int token, FCompileContext &ctx)
{
for (unsigned int i = 0; i < ctx.Jumps.Size(); i++)
{
if (ctx.Jumps[i]->Token == token)
{
ctx.Jumps[i]->AddressResolver = this;
JumpAddresses.Push(ctx.Jumps[i]);
ctx.Jumps.Delete(i);
i--;
}
}
}
//==========================================================================
//
// FxWhileLoop
//
//==========================================================================
FxWhileLoop::FxWhileLoop(FxExpression *condition, FxExpression *code, const FScriptPosition &pos)
: FxLoopStatement(pos), Condition(condition), Code(code)
{
ValueType = TypeVoid;
}
FxWhileLoop::~FxWhileLoop()
{
SAFE_DELETE(Condition);
SAFE_DELETE(Code);
}
FxExpression *FxWhileLoop::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(Condition, ctx);
SAFE_RESOLVE_OPT(Code, ctx);
HandleJumps(TK_Break, ctx);
HandleJumps(TK_Continue, 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);
}
// Give a proper address to any break/continue statement within this loop.
for (unsigned int i = 0; i < JumpAddresses.Size(); i++)
{
if (JumpAddresses[i]->Token == TK_Break)
{
build->Backpatch(JumpAddresses[i]->Address, loopend);
}
else
{ // Continue statement.
build->Backpatch(JumpAddresses[i]->Address, loopstart);
}
}
return ExpEmit();
}
//==========================================================================
//
// FxDoWhileLoop
//
//==========================================================================
FxDoWhileLoop::FxDoWhileLoop(FxExpression *condition, FxExpression *code, const FScriptPosition &pos)
: FxLoopStatement(pos), Condition(condition), Code(code)
{
ValueType = TypeVoid;
}
FxDoWhileLoop::~FxDoWhileLoop()
{
SAFE_DELETE(Condition);
SAFE_DELETE(Code);
}
FxExpression *FxDoWhileLoop::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(Condition, ctx);
SAFE_RESOLVE_OPT(Code, ctx);
HandleJumps(TK_Break, ctx);
HandleJumps(TK_Continue, 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 (JumpAddresses.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();
// Give a proper address to any break/continue statement within this loop.
for (unsigned int i = 0; i < JumpAddresses.Size(); i++)
{
if (JumpAddresses[i]->Token == TK_Break)
{
build->Backpatch(JumpAddresses[i]->Address, loopend);
}
else
{ // Continue statement.
build->Backpatch(JumpAddresses[i]->Address, loopstart);
}
}
return ExpEmit();
}
//==========================================================================
//
// FxForLoop
//
//==========================================================================
FxForLoop::FxForLoop(FxExpression *init, FxExpression *condition, FxExpression *iteration, FxExpression *code, const FScriptPosition &pos)
: FxLoopStatement(pos), Init(init), Condition(condition), Iteration(iteration), Code(code)
{
ValueType = TypeVoid;
}
FxForLoop::~FxForLoop()
{
SAFE_DELETE(Init);
SAFE_DELETE(Condition);
SAFE_DELETE(Iteration);
SAFE_DELETE(Code);
}
FxExpression *FxForLoop::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE_OPT(Init, ctx);
SAFE_RESOLVE_OPT(Condition, ctx);
SAFE_RESOLVE_OPT(Iteration, ctx);
SAFE_RESOLVE_OPT(Code, ctx);
HandleJumps(TK_Break, ctx);
HandleJumps(TK_Continue, 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.
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);
}
// Give a proper address to any break/continue statement within this loop.
for (unsigned int i = 0; i < JumpAddresses.Size(); i++)
{
if (JumpAddresses[i]->Token == TK_Break)
{
build->Backpatch(JumpAddresses[i]->Address, loopend);
}
else
{ // Continue statement.
build->Backpatch(JumpAddresses[i]->Address, loopstart);
}
}
return ExpEmit();
}
//==========================================================================
//
// FxJumpStatement
//
//==========================================================================
FxJumpStatement::FxJumpStatement(int token, const FScriptPosition &pos)
: FxExpression(pos), Token(token), AddressResolver(nullptr)
{
ValueType = TypeVoid;
}
FxExpression *FxJumpStatement::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
ctx.Jumps.Push(this);
return this;
}
ExpEmit FxJumpStatement::Emit(VMFunctionBuilder *build)
{
if (AddressResolver == nullptr)
{
ScriptPosition.Message(MSG_ERROR, "Jump statement %s has nowhere to go!", FScanner::TokenName(Token).GetChars());
}
Address = build->Emit(OP_JMP, 0);
return ExpEmit();
}
//==========================================================================
//
//==========================================================================
FxReturnStatement::FxReturnStatement(FxExpression *value, const FScriptPosition &pos)
: FxExpression(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
{
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, out.RegType | (out.Konst ? REGT_KONST : 0), 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(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->GetClass() == RUNTIME_CLASS(PClassPointer))
{
auto to = static_cast<PClassPointer *>(ValueType);
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 NULL;
}
if (basex->isConstant())
{
FName clsname = static_cast<FxConstant *>(basex)->GetValue().GetName();
PClass *cls = NULL;
if (clsname != NAME_None)
{
cls = PClass::FindClass(clsname);
if (cls == NULL)
{
/* 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_ERROR, "class '%s' is not compatible with '%s'", clsname.GetChars(), desttype->TypeName.GetChars());
delete this;
return NULL;
}
ScriptPosition.Message(MSG_DEBUG, "resolving '%s' as class name", clsname.GetChars());
}
}
FxExpression *x = new FxConstant(cls, ScriptPosition);
delete this;
return x;
}
if (basex->ValueType == TypeString)
{
basex = new FxNameCast(basex);
}
return this;
}
//==========================================================================
//
//
//
//==========================================================================
int DecoNameToClass(VMFrameStack *stack, VMValue *param, 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);
const PClass *cls = PClass::FindClass(clsname);
const PClass *desttype = reinterpret_cast<PClass *>(param[0].a);
if (!cls->IsDescendantOf(desttype))
{
Printf("class '%s' is not compatible with '%s'", clsname.GetChars(), desttype->TypeName.GetChars());
cls = NULL;
}
ret->SetPointer(const_cast<PClass *>(cls), ATAG_OBJECT);
return 1;
}
ExpEmit FxClassTypeCast::Emit(VMFunctionBuilder *build)
{
if (basex->ValueType != TypeName)
{
return ExpEmit(build->GetConstantAddress(NULL, 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 DecoNameToClass function to convert from 'name' to class.
VMFunction *callfunc;
PSymbol *sym = FindDecorateBuiltinFunction(NAME_DecoNameToClass, DecoNameToClass);
assert(sym->IsKindOf(RUNTIME_CLASS(PSymbolVMFunction)));
assert(((PSymbolVMFunction *)sym)->Function != NULL);
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;
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxStateByIndex::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
ABORT(ctx.Class);
auto aclass = dyn_cast<PClassActor>(ctx.Class);
// This expression type can only be used from DECORATE, so there's no need to consider the possibility of calling it from a non-actor.
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 NULL;
}
FxExpression *x = new FxConstant(aclass->OwnedStates + index, ScriptPosition);
delete this;
return x;
}
//==========================================================================
//
//
//
//==========================================================================
FxRuntimeStateIndex::FxRuntimeStateIndex(FxExpression *index)
: FxExpression(index->ScriptPosition), Index(index)
{
EmitTail = false;
ValueType = TypeState;
}
FxRuntimeStateIndex::~FxRuntimeStateIndex()
{
SAFE_DELETE(Index);
}
PPrototype *FxRuntimeStateIndex::ReturnProto()
{
EmitTail = true;
return FxExpression::ReturnProto();
}
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->ValueType->GetRegType() != REGT_INT)
{ // Float.
Index = new FxIntCast(Index, ctx.FromDecorate);
SAFE_RESOLVE(Index, ctx);
}
return this;
}
static bool VerifyJumpTarget(AActor *stateowner, FStateParamInfo *stateinfo, int index)
{
PClassActor *cls = stateowner->GetClass();
if (stateinfo->mCallingState != nullptr)
{
while (cls != RUNTIME_CLASS(AActor))
{
// both calling and target state need to belong to the same class.
if (cls->OwnsState(stateinfo->mCallingState))
{
return cls->OwnsState(stateinfo->mCallingState + index);
}
// We can safely assume the ParentClass is of type PClassActor
// since we stop when we see the Actor base class.
cls = static_cast<PClassActor *>(cls->ParentClass);
}
}
return false;
}
static int DecoHandleRuntimeState(VMFrameStack *stack, VMValue *param, int numparam, VMReturn *ret, int numret)
{
PARAM_PROLOGUE;
PARAM_OBJECT(stateowner, AActor);
PARAM_POINTER(stateinfo, FStateParamInfo);
PARAM_INT(index);
if (index == 0 || !VerifyJumpTarget(stateowner, stateinfo, index))
{
// Null is returned if the location was invalid which means that no jump will be performed
// if used as return value
// 0 always meant the same thing so we handle it here for compatibility
ACTION_RETURN_STATE(nullptr);
}
else
{
ACTION_RETURN_STATE(stateinfo->mCallingState + index);
}
}
ExpEmit FxRuntimeStateIndex::Emit(VMFunctionBuilder *build)
{
assert(build->IsActionFunc && build->Registers[REGT_POINTER].GetMostUsed() >= 3 &&
"FxRuntimeStateIndex is only valid inside action functions");
ExpEmit out(build, REGT_POINTER);
build->Emit(OP_PARAM, 0, REGT_POINTER, 1); // stateowner
build->Emit(OP_PARAM, 0, REGT_POINTER, 2); // stateinfo
ExpEmit id = Index->Emit(build);
build->Emit(OP_PARAM, 0, REGT_INT | (id.Konst ? REGT_KONST : 0), id.RegNum); // index
VMFunction *callfunc;
PSymbol *sym;
sym = FindDecorateBuiltinFunction(NAME_DecoHandleRuntimeState, DecoHandleRuntimeState);
assert(sym->IsKindOf(RUNTIME_CLASS(PSymbolVMFunction)));
assert(((PSymbolVMFunction *)sym)->Function != nullptr);
callfunc = ((PSymbolVMFunction *)sym)->Function;
if (EmitTail)
{
build->Emit(OP_TAIL_K, build->GetConstantAddress(callfunc, ATAG_OBJECT), 3, 1);
out.Final = true;
}
else
{
build->Emit(OP_CALL_K, build->GetConstantAddress(callfunc, ATAG_OBJECT), 3, 1);
build->Emit(OP_RESULT, 0, REGT_POINTER, out.RegNum);
}
return out;
}
//==========================================================================
//
//
//
//==========================================================================
FxMultiNameState::FxMultiNameState(const char *_statestring, const FScriptPosition &pos)
:FxExpression(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 = NULL;
}
//==========================================================================
//
//
//
//==========================================================================
FxExpression *FxMultiNameState::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
ABORT(ctx.Class);
if (names[0] == NAME_None)
{
scope = NULL;
}
else if (names[0] == NAME_Super)
{
scope = dyn_cast<PClassActor>(ctx.Class->ParentClass);
}
else
{
scope = PClass::FindActor(names[0]);
if (scope == NULL)
{
ScriptPosition.Message(MSG_ERROR, "Unknown class '%s' in state label", names[0].GetChars());
delete this;
return NULL;
}
else if (!scope->IsAncestorOf(ctx.Class))
{
ScriptPosition.Message(MSG_ERROR, "'%s' is not an ancestor of '%s'", names[0].GetChars(), ctx.Class->TypeName.GetChars());
delete this;
return NULL;
}
}
if (scope != NULL)
{
FState *destination = NULL;
// 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 == NULL)
{
ScriptPosition.Message(MSG_OPTERROR, "Unknown state jump destination");
/* lax */
return this;
}
}
FxExpression *x = new FxConstant(destination, ScriptPosition);
delete this;
return x;
}
names.Delete(0);
names.ShrinkToFit();
ValueType = TypeState;
return this;
}
//==========================================================================
//
//
//
//==========================================================================
static int DoFindState(VMFrameStack *stack, VMValue *param, int numparam, VMReturn *ret, FName *names, int numnames)
{
PARAM_OBJECT_AT(0, self, AActor);
FState *state = self->GetClass()->FindState(numparam - 1, names);
if (state == NULL)
{
const char *dot = "";
Printf("Jump target '");
for (int i = 0; i < numparam - 1; i++)
{
Printf("%s%s", dot, names[i].GetChars());
dot = ".";
}
Printf("' not found in %s\n", self->GetClass()->TypeName.GetChars());
}
ret->SetPointer(state, ATAG_STATE);
return 1;
}
// Find a state with any number of dots in its name.
int BuiltinFindMultiNameState(VMFrameStack *stack, VMValue *param, int numparam, VMReturn *ret, int numret)
{
assert(numparam > 1);
assert(numret == 1);
assert(ret->RegType == REGT_POINTER);
FName *names = (FName *)alloca((numparam - 1) * sizeof(FName));
for (int i = 1; i < numparam; ++i)
{
PARAM_NAME_AT(i, zaname);
names[i - 1] = zaname;
}
return DoFindState(stack, param, numparam, ret, names, numparam - 1);
}
// Find a state without any dots in its name.
int BuiltinFindSingleNameState(VMFrameStack *stack, VMValue *param, int numparam, VMReturn *ret, int numret)
{
assert(numparam == 2);
assert(numret == 1);
assert(ret->RegType == REGT_POINTER);
PARAM_NAME_AT(1, zaname);
return DoFindState(stack, param, numparam, ret, &zaname, 1);
}
ExpEmit FxMultiNameState::Emit(VMFunctionBuilder *build)
{
ExpEmit dest(build, REGT_POINTER);
if (build->IsActionFunc)
{
build->Emit(OP_PARAM, 0, REGT_POINTER, 1); // pass stateowner
}
else
{
build->Emit(OP_PARAM, 0, REGT_POINTER, 0); // pass self
}
for (unsigned i = 0; i < names.Size(); ++i)
{
build->EmitParamInt(names[i]);
}
// For one name, use the BuiltinFindSingleNameState function. For more than
// one name, use the BuiltinFindMultiNameState function.
VMFunction *callfunc;
PSymbol *sym;
if (names.Size() == 1)
{
sym = FindDecorateBuiltinFunction(NAME_BuiltinFindSingleNameState, BuiltinFindSingleNameState);
}
else
{
sym = FindDecorateBuiltinFunction(NAME_BuiltinFindMultiNameState, BuiltinFindMultiNameState);
}
assert(sym->IsKindOf(RUNTIME_CLASS(PSymbolVMFunction)));
assert(((PSymbolVMFunction *)sym)->Function != NULL);
callfunc = ((PSymbolVMFunction *)sym)->Function;
build->Emit(OP_CALL_K, build->GetConstantAddress(callfunc, ATAG_OBJECT), names.Size() + 1, 1);
build->Emit(OP_RESULT, 0, REGT_POINTER, dest.RegNum);
return dest;
}
//==========================================================================
//
//
//
//==========================================================================
FxDamageValue::FxDamageValue(FxExpression *v)
: FxExpression(v->ScriptPosition)
{
val = v;
ValueType = TypeVoid;
}
FxDamageValue::~FxDamageValue()
{
SAFE_DELETE(val);
}
FxExpression *FxDamageValue::Resolve(FCompileContext &ctx)
{
CHECKRESOLVED();
SAFE_RESOLVE(val, ctx)
if (!val->IsNumeric())
{
ScriptPosition.Message(MSG_ERROR, "Numeric type expected");
delete this;
return NULL;
}
return this;
}
// This is a highly-specialized "expression" type that emits a complete function.
ExpEmit FxDamageValue::Emit(VMFunctionBuilder *build)
{
if (val->isConstant())
{
build->EmitRetInt(0, false, static_cast<FxConstant *>(val)->GetValue().Int);
}
else
{
ExpEmit emitval = val->Emit(build);
assert(emitval.RegType == REGT_INT);
build->Emit(OP_RET, 0, REGT_INT | (emitval.Konst ? REGT_KONST : 0), emitval.RegNum);
}
build->Emit(OP_RETI, 1 | RET_FINAL, true);
return ExpEmit();
}
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