protected override void DoEmitCode(CompilerTarget target, StackSemantics stackSemantics)
{
//Optimize condition
_OptimizeNode(target, ref Condition);
// Invert condition when unary logical not
AstIndirectCall unaryCond;
while (Condition.IsCommandCall(Commands.Core.Operators.LogicalNot.DefaultAlias, out unaryCond))
{
Condition = unaryCond.Arguments[0];
IsNegative = !IsNegative;
}
//Constant conditions
if (Condition is AstConstant)
{
var constCond = (AstConstant) Condition;
PValue condValue;
if (
!constCond.ToPValue(target).TryConvertTo(
target.Loader, PType.Bool, out condValue))
goto continueFull;
else if (((bool) condValue.Value) ^ IsNegative)
IfBlock.EmitEffectCode(target);
else
ElseBlock.EmitEffectCode(target);
return;
}
//Conditions with empty blocks
if (IfBlock.IsEmpty && ElseBlock.IsEmpty)
{
Condition.EmitEffectCode(target);
return;
}
continueFull:
;
//Switch If and Else block in case the if-block is empty
if (IfBlock.IsEmpty)
{
IsNegative = !IsNegative;
var tmp = IfBlock;
IfBlock = ElseBlock;
ElseBlock = tmp;
}
var elseLabel = "else\\" + _depth + "\\assembler";
var endLabel = "endif\\" + _depth + "\\assembler";
_depth++;
//Emit
var ifGoto = IfBlock.IsSingleStatement
? IfBlock[0] as AstExplicitGoTo
: null;
var elseGoto = ElseBlock.IsSingleStatement
? ElseBlock[0] as AstExplicitGoTo
: null;
;
var ifIsGoto = ifGoto != null;
var elseIsGoto = elseGoto != null;
if (ifIsGoto && elseIsGoto)
{
//only jumps
AstLazyLogical.EmitJumpCondition(
target,
Condition,
ifGoto.Destination,
elseGoto.Destination,
!IsNegative);
}
else if (ifIsGoto)
{
//if => jump / else => block
AstLazyLogical.EmitJumpCondition(target, Condition, ifGoto.Destination, !IsNegative);
ElseBlock.EmitEffectCode(target);
}
else if (elseIsGoto)
{
//if => block / else => jump
AstLazyLogical.EmitJumpCondition(
target, Condition, elseGoto.Destination, IsNegative); //inverted
IfBlock.EmitEffectCode(target);
}
else
{
//if => block / else => block
AstLazyLogical.EmitJumpCondition(target, Condition, elseLabel, IsNegative);
IfBlock.EmitEffectCode(target);
target.EmitJump(Position, endLabel);
target.EmitLabel(Position, elseLabel);
ElseBlock.EmitEffectCode(target);
target.EmitLabel(Position, endLabel);
}
target.FreeLabel(elseLabel);
target.FreeLabel(endLabel);
}
protected override void DoEmitCode(CompilerTarget target, string trueLabel,
string falseLabel)
{
var labelNs = @"Or\" + Guid.NewGuid().ToString("N");
var nextLabel = @"Next\" + labelNs;
foreach (var expr in Conditions)
{
var and = expr as AstLogicalAnd;
if (and != null)
{
and.EmitCode(target, trueLabel, nextLabel);
//ResolveOperator pending jumps to Next
target.EmitLabel(Position, nextLabel);
target.FreeLabel(nextLabel);
//Future references of to nextLabel will be resolved in the next iteration
}
else
{
expr.EmitValueCode(target);
target.EmitJumpIfTrue(Position, trueLabel);
}
}
target.EmitJump(Position, falseLabel);
}
protected override void DoEmitCode(CompilerTarget target, StackSemantics stackSemantics)
{
//Optimize condition
_OptimizeNode(target, ref Condition);
_OptimizeNode(target, ref IfExpression);
_OptimizeNode(target, ref ElseExpression);
var elseLabel = "elsei\\" + _depth + "\\assembler";
var endLabel = "endifi\\" + _depth + "\\assembler";
_depth++;
//Emit
//if => block / else => block
AstLazyLogical.EmitJumpCondition(target, Condition, elseLabel, IsNegative);
IfExpression.EmitCode(target, stackSemantics);
target.EmitJump(Position, endLabel);
target.EmitLabel(Position, elseLabel);
ElseExpression.EmitCode(target, stackSemantics);
target.EmitLabel(Position, endLabel);
target.FreeLabel(elseLabel);
target.FreeLabel(endLabel);
}