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- cleaned out a large part of unused methods from VMValue.

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- keep string registers which are being used as function parameters allocated until after the function call returns. This is for allowing to pass strings by reference which would avoid some costly constructor/destructor loops in the call instruction.
This commit is contained in:
Christoph Oelckers 2017-03-19 21:25:30 +01:00
parent 0a11e38967
commit 403c5693a9
4 changed files with 29 additions and 194 deletions
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43
src/scripting/backend/codegen.cpp
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@ -503,7 +503,7 @@ static int EncodeRegType(ExpEmit reg)
//
//==========================================================================
static int EmitParameter(VMFunctionBuilder *build, FxExpression *operand, const FScriptPosition &pos)
static int EmitParameter(VMFunctionBuilder *build, FxExpression *operand, const FScriptPosition &pos, TArray<ExpEmit> *tempstrings = nullptr)
{
ExpEmit where = operand->Emit(build);
@ -516,7 +516,14 @@ static int EmitParameter(VMFunctionBuilder *build, FxExpression *operand, const
else
{
build->Emit(OP_PARAM, 0, EncodeRegType(where), where.RegNum);
where.Free(build);
if (tempstrings != nullptr && where.RegType == REGT_STRING && !where.Fixed && !where.Konst)
{
tempstrings->Push(where); // keep temp strings until after the function call.
}
else
{
where.Free(build);
}
return where.RegCount;
}
}
@ -6581,18 +6588,6 @@ FxClassDefaults::~FxClassDefaults()
}
//==========================================================================
//
//
//
//==========================================================================
PPrototype *FxClassDefaults::ReturnProto()
{
EmitTail = true;
return FxExpression::ReturnProto();
}
//==========================================================================
//
//
@ -8572,7 +8567,6 @@ FxVMFunctionCall::FxVMFunctionCall(FxExpression *self, PFunction *func, FArgumen
Self = self;
Function = func;
ArgList = std::move(args);
EmitTail = false;
NoVirtual = novirtual;
CallingFunction = nullptr;
}
@ -8595,6 +8589,8 @@ FxVMFunctionCall::~FxVMFunctionCall()
PPrototype *FxVMFunctionCall::ReturnProto()
{
if (hasStringArgs)
return FxExpression::ReturnProto();
EmitTail = true;
return Function->Variants[0].Proto;
}
@ -8810,6 +8806,10 @@ FxExpression *FxVMFunctionCall::Resolve(FCompileContext& ctx)
}
failed |= (x == nullptr);
ArgList[i] = x;
if (!failed && x->ValueType == TypeString)
{
hasStringArgs = true;
}
}
int numargs = ArgList.Size() + implicit;
if ((unsigned)numargs < argtypes.Size() && argtypes[numargs] != nullptr)
@ -8861,6 +8861,8 @@ FxExpression *FxVMFunctionCall::Resolve(FCompileContext& ctx)
ExpEmit FxVMFunctionCall::Emit(VMFunctionBuilder *build)
{
TArray<ExpEmit> tempstrings;
assert(build->Registers[REGT_POINTER].GetMostUsed() >= build->NumImplicits);
int count = 0;
@ -8873,6 +8875,7 @@ ExpEmit FxVMFunctionCall::Emit(VMFunctionBuilder *build)
{
ArgList.DeleteAndClear();
ArgList.ShrinkToFit();
for (auto & exp : tempstrings) exp.Free(build);
return reg;
}
}
@ -8939,7 +8942,7 @@ ExpEmit FxVMFunctionCall::Emit(VMFunctionBuilder *build)
// Emit code to pass explicit parameters
for (unsigned i = 0; i < ArgList.Size(); ++i)
{
count += EmitParameter(build, ArgList[i], ScriptPosition);
count += EmitParameter(build, ArgList[i], ScriptPosition, &tempstrings);
}
ArgList.DeleteAndClear();
ArgList.ShrinkToFit();
@ -8954,6 +8957,7 @@ ExpEmit FxVMFunctionCall::Emit(VMFunctionBuilder *build)
build->Emit(OP_TAIL_K, funcaddr, count, 0);
ExpEmit call;
call.Final = true;
for (auto & exp : tempstrings) exp.Free(build);
return call;
}
else if (vmfunc->Proto->ReturnTypes.Size() > 0)
@ -8964,6 +8968,7 @@ ExpEmit FxVMFunctionCall::Emit(VMFunctionBuilder *build)
else
{ // Call, expecting no results
build->Emit(OP_CALL_K, funcaddr, count, 0);
for (auto & exp : tempstrings) exp.Free(build);
return ExpEmit();
}
}
@ -8978,6 +8983,7 @@ ExpEmit FxVMFunctionCall::Emit(VMFunctionBuilder *build)
build->Emit(OP_TAIL, funcreg.RegNum, count, 0);
ExpEmit call;
call.Final = true;
for (auto & exp : tempstrings) exp.Free(build);
return call;
}
else if (vmfunc->Proto->ReturnTypes.Size() > 0)
@ -8988,6 +8994,7 @@ ExpEmit FxVMFunctionCall::Emit(VMFunctionBuilder *build)
else
{ // Call, expecting no results
build->Emit(OP_CALL, funcreg.RegNum, count, 0);
for (auto & exp : tempstrings) exp.Free(build);
return ExpEmit();
}
}
@ -8997,6 +9004,7 @@ handlereturns:
// Regular call, will not write to ReturnRegs
ExpEmit reg(build, vmfunc->Proto->ReturnTypes[0]->GetRegType(), vmfunc->Proto->ReturnTypes[0]->GetRegCount());
build->Emit(OP_RESULT, 0, EncodeRegType(reg), reg.RegNum);
for (auto & exp : tempstrings) exp.Free(build);
return reg;
}
else
@ -9009,8 +9017,9 @@ handlereturns:
build->Emit(OP_RESULT, 0, EncodeRegType(reg), reg.RegNum);
ReturnRegs.Push(reg);
}
return ExpEmit();
}
for (auto & exp : tempstrings) exp.Free(build);
return ExpEmit();
}
//==========================================================================