public ILabel GenerateClosureCall(
ILocation result,
IEnumerable <VirtualRegister> callArguments,
ILabel onReturn,
Function.Function callerFunction,
FunType funType,
VirtualRegister funPtr)
{
var needStackOffset = funType.GetStackArgumentsCount() % 2 == 1 ? 8 : 0;
var funPtrRead = new RegisterRead(funPtr);
var funCodePtr = new MemoryRead(
new ArithmeticBinaryOperation(AST.ArithmeticOperationType.Addition, funPtrRead, new IntegerImmediateValue(0)));
var funClosurePtr = new MemoryRead(
new ArithmeticBinaryOperation(AST.ArithmeticOperationType.Addition, funPtrRead, new IntegerImmediateValue(16)));
var preCall = new List <Node>
{
new AlignStackPointer(needStackOffset)
}
.Append(new Comment("Pass arguments"))
.Concat(this.PassClosureArguments(callArguments, funClosurePtr))
.Append(new ClearDF())
.Append(new Comment($"Call closure function"))
.Append(
new UsesDefinesNode(
HardwareRegisterUtils.ArgumentRegisters.Take(callArguments.Count() + 1).ToList(),
HardwareRegisterUtils.CallerSavedRegisters))
.Append(new RegisterWrite(HardwareRegister.RAX, funCodePtr));
var postCall = new List <Node>
{
new Comment("Copy function result to variable"),
this.readWriteGenerator.GenerateWrite(callerFunction, result, new RegisterRead(HardwareRegister.RAX)),
new Comment("Restore RSP alignment"),
new AlignStackPointer(-(needStackOffset + (8 * funType.GetStackArgumentsCount()))),
new Comment("End of call"),
};
var controlFlow = new ComputedFunctionCall(postCall.MakeTreeChain(this.labelFactory, onReturn));
return(preCall.MakeTreeChain(this.labelFactory, controlFlow));
}
