private void _emitIncrementDecrementCode(CompilerTarget target, StackSemantics value)
{
var symbolCall = _operand as AstIndirectCall;
var symbol = symbolCall == null ? null : symbolCall.Subject as AstReference;
EntityRef.Variable variableRef = null;
var isVariable = symbol != null && symbol.Entity.TryGetVariable(out variableRef);
var isPre = _operator == UnaryOperator.PreDecrement || _operator == UnaryOperator.PreIncrement;
switch (_operator)
{
case UnaryOperator.PreIncrement:
case UnaryOperator.PostIncrement:
case UnaryOperator.PreDecrement:
case UnaryOperator.PostDecrement:
var isIncrement =
_operator == UnaryOperator.PostIncrement ||
_operator == UnaryOperator.PreIncrement;
if (isVariable)
{
Debug.Assert(variableRef != null);
EntityRef.Variable.Local localRef;
Action loadVar;
Action perform;
EntityRef.Variable.Global globalRef;
// First setup the two actions
if (variableRef.TryGetLocalVariable(out localRef))
{
loadVar = () => target.EmitLoadLocal(Position, localRef.Id);
perform =
() => target.Emit(Position, isIncrement ? OpCode.incloc : OpCode.decloc, localRef.Id);
}
else if(variableRef.TryGetGlobalVariable(out globalRef))
{
loadVar = () => target.EmitLoadGlobal(Position, globalRef.Id, globalRef.ModuleName);
perform =
() =>
target.Emit(Position, isIncrement ? OpCode.incglob : OpCode.decglob, globalRef.Id,
globalRef.ModuleName);
}
else
{
throw new InvalidOperationException("Found variable entity that is neither a global nor a local variable.");
}
// Then decide in what order to apply them.
if (!isPre && value == StackSemantics.Value)
{
loadVar();
}
perform();
if (isPre && value == StackSemantics.Value)
{
loadVar();
}
}
else
throw new PrexoniteException(
"Node of type " + _operand.GetType() +
" does not support increment/decrement operators.");
break;
// ReSharper disable RedundantCaseLabel
case UnaryOperator.UnaryNegation:
case UnaryOperator.LogicalNot:
case UnaryOperator.OnesComplement:
// ReSharper restore RedundantCaseLabel
// ReSharper disable RedundantEmptyDefaultSwitchBranch
default:
break; //No effect
// ReSharper restore RedundantEmptyDefaultSwitchBranch
}
}