public override void EmitGet(InstructionWriter writer, AllocatedLocal dest)
{
var leftStack = _leftStack ?? dest;
var rightStack = _rightStack ?? dest;
if (_left.GetSingleType() != _type || _right.GetSingleType() != _type)
{
//Needs conversion in MOV and ISTC.
throw new NotImplementedException();
}
if (leftStack.Offset > 255 || rightStack.Offset > 255 || dest.Offset > 255)
{
throw new NotImplementedException();
}
// emit leftStack = _left
// ISFC/ISTC dest, leftStack, exitLabel
// emit rightStack = _right
// MOV dest, rightStack
//exitLabel:
var exitLabel = new LabelStatementSyntaxNode();
_left.EmitPrep(writer);
_left.EmitGet(writer, leftStack);
writer.WriteUUS(_opcode, dest.Offset, leftStack.Offset, 0);
writer.AddLabelFix(exitLabel, InstructionWriter.FixUUSJump);
_right.EmitPrep(writer);
_right.EmitGet(writer, rightStack);
//We already wrote to dest. No need to MOV.
Debug.Assert(rightStack.Offset == dest.Offset);
writer.MarkLabel(exitLabel);
}
public override void Emit(InstructionWriter writer)
{
Debug.Assert(_firstLoopVarStack.Offset == _hiddenVariableStack.Offset + 3);
_forBlock.EmitUpvalLists(writer);
var exitLabel = new LabelStatementSyntaxNode();
var loopLabel = new LabelStatementSyntaxNode();
//Insert assignment and FORG instruction (call iterator function and check for exit condition).
_assignment.Emit(writer);
writer.MarkLabel(loopLabel);
if (_hiddenVariableStack.Offset > 255 || _loopVarSig > 255)
{
throw new NotImplementedException();
}
writer.WriteUUS(Opcodes.FORG, _hiddenVariableStack.Offset, _loopVarSig, 0);
writer.AddLabelFix(exitLabel, InstructionWriter.FixUUSJump);
//Emit inner block.
_forBlock.EmitStatements(writer);
//Jump back.
writer.WriteUSx(Opcodes.JMP, 0, 0);
writer.AddLabelFix(loopLabel, InstructionWriter.FixUSxJump);
writer.MarkLabel(exitLabel);
}
public override void EmitGet(InstructionWriter writer, IStackFragment sigBlock, StackSignature sigType,
int sigIndex, bool keepSig)
{
Debug.Assert(_isVararg);
if (sigIndex > 255 || sigBlock.Offset > 255 | sigType.FixedSize > 127)
{
throw new NotImplementedException();
}
//Note that for VARG/VARGC, we are using a different version of R1-R3. See OpCodes doc for details.
Debug.Assert(_funcVarargSig.FixedSize == 0);
if (_funcVarargSig.IsCompatibleWith(sigType))
{
writer.WriteUUS(keepSig ? OpCodes.VARG : OpCodes.VARGC,
sigBlock.Offset, sigIndex, sigType.FixedSize);
}
else
{
writer.WriteUUS(keepSig ? OpCodes.VARG : OpCodes.VARGC,
sigBlock.Offset, sigIndex, -1);
}
}
public override void Emit(InstructionWriter writer)
{
Debug.Assert(_firstLoopVarStack.Offset == _hiddenVariableStack.Offset + 3);
_forBlock.EmitUpvalLists(writer);
var exitLabel = new LabelStatementSyntaxNode();
var loopLabel = new LabelStatementSyntaxNode();
//Insert assignment and FORG instruction (call iterator function and check for exit condition).
_assignment.Emit(writer);
writer.MarkLabel(loopLabel);
if (_hiddenVariableStack.Offset > 255 || _loopVarSig > 255 || _loopVarSigType.FixedSize > 127)
{
throw new NotImplementedException();
}
writer.WriteUSx(OpCodes.FORG, _hiddenVariableStack.Offset, 0);
writer.AddLabelFix(exitLabel, InstructionWriter.FixUSxJump);
//Adjust right parameter: assume EmptyV.
if (_loopVarSigType.IsCompatibleWith(StackSignature.EmptyV))
{
writer.WriteUUS(OpCodes.FORG_CTN,
_loopVarSig, (int)WellKnownStackSignature.EmptyV, _loopVarSigType.FixedSize);
}
else
{
writer.WriteUUS(OpCodes.FORG_CTN, _loopVarSig, 0, 0);
}
//Emit inner block.
_forBlock.EmitStatements(writer);
//Jump back.
writer.WriteUSx(OpCodes.JMP, 0, 0);
writer.AddLabelFix(loopLabel, InstructionWriter.FixUSxJump);
writer.MarkLabel(exitLabel);
}