protected override CompilerItem TranslateImpl(CompilerContext cc)
{
int i;
int variablesCount = (_variables != null) ? _variables.Length : 0;
if (variablesCount > 0)
{
// These variables are used by the instruction and we set current offset
// to their work offsets -> getSpillCandidate never return the variable
// used this instruction.
for (i = 0; i < variablesCount; i++)
{
_variables[i].VarData.WorkOffset = cc.CurrentOffset;
}
// Alloc variables used by the instruction (special first).
for (i = 0; i < variablesCount; i++)
{
VarAllocRecord r = _variables[i];
// Alloc variables with specific register first.
if ((r.VarFlags & VariableAlloc.Special) != 0)
cc.AllocVar(r.VarData, r.RegMask, r.VarFlags);
}
for (i = 0; i < variablesCount; i++)
{
VarAllocRecord r = _variables[i];
// Alloc variables without specific register last.
if ((r.VarFlags & VariableAlloc.Special) == 0)
cc.AllocVar(r.VarData, r.RegMask, r.VarFlags);
}
cc.TranslateOperands(_operands);
}
if (_memoryOperand != null && (_memoryOperand.Id & Operand.OperandIdTypeMask) == Operand.OperandIdTypeVar)
{
CompilerVar vdata = Compiler.GetVarData(_memoryOperand.Id);
Contract.Assert(vdata != null);
switch (vdata.State)
{
case VariableState.Unused:
vdata.State = VariableState.Memory;
break;
case VariableState.Register:
vdata.Changed = false;
cc.UnuseVar(vdata, VariableState.Memory);
break;
}
}
for (i = 0; i < variablesCount; i++)
{
cc.UnuseVarOnEndOfScope(this, _variables[i]);
}
return Next;
}
protected override CompilerItem TranslateImpl(CompilerContext cc)
{
switch (_hintKind)
{
case VariableHintKind.Alloc:
cc.AllocVar(_varData, new RegisterMask(_hintValue), VariableAlloc.Read);
break;
case VariableHintKind.Spill:
if (_varData.State == VariableState.Register)
cc.SpillVar(_varData);
break;
case VariableHintKind.Save:
case VariableHintKind.SaveAndUnuse:
if (_varData.State == VariableState.Register && _varData.Changed)
{
cc.EmitSaveVar(_varData, _varData.RegisterIndex);
_varData.Changed = false;
}
if (_hintKind == VariableHintKind.SaveAndUnuse)
goto case VariableHintKind.Unuse;
break;
case VariableHintKind.Unuse:
cc.UnuseVar(_varData, VariableState.Unused);
goto end;
}
cc.UnuseVarOnEndOfScope(this, _varData);
end:
return Next;
}
