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 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);
}
public override void Emit(InstructionWriter writer)
{
var restartLabel = new LabelStatementSyntaxNode();
var exitLabel = new LabelStatementSyntaxNode();
if (_e1Stack.Offset > 255 || _loopVar.Offset > 255)
{
throw new NotImplementedException();
}
//Calc expressions.
_e1.EmitPrep(writer);
_e1.EmitGet(writer, _e1Stack);
_e2.EmitPrep(writer);
_e2.EmitGet(writer, _e2Stack);
_e3.EmitPrep(writer);
_e3.EmitGet(writer, _e3Stack);
//Init instruction (check type, check exit condition).
writer.WriteUSx(_initOp, _e1Stack.Offset, 0);
writer.AddLabelFix(exitLabel, InstructionWriter.FixUSxJump);
//This is where we restart.
writer.MarkLabel(restartLabel);
//Start of the actual block (creates upvals).
_forBlock.EmitUpvalLists(writer);
//Copy hidden control variable to the visible loop var.
writer.WriteUUU(Opcodes.MOV, _loopVar.Offset, _e1Stack.Offset, 0);
//Emit inner aux block.
_forBlock.EmitStatements(writer);
//Loop instruction.
writer.WriteUSx(_loopOp, _e1Stack.Offset, 0);
writer.AddLabelFix(restartLabel, InstructionWriter.FixUSxJump);
writer.MarkLabel(exitLabel);
}