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//===----- CGCall.h - Encapsulate calling convention details ----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// These classes wrap the information about a call or function
// definition used to handle ABI compliancy.
//
//===----------------------------------------------------------------------===//
#include "CGCall.h"
#include "CodeGenFunction.h"
#include "clang/AST/ASTContext.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclObjC.h"
#include "llvm/ParameterAttributes.h"
using namespace clang;
using namespace CodeGen;
/***/
// FIXME: Use iterator and sidestep silly type array creation.
CGFunctionInfo::CGFunctionInfo(const FunctionDecl *FD)
: TheDecl(FD)
{
const FunctionType *FTy = FD->getType()->getAsFunctionType();
const FunctionTypeProto *FTP = dyn_cast<FunctionTypeProto>(FTy);
ArgTypes.push_back(FTy->getResultType());
if (FTP)
for (unsigned i = 0, e = FTP->getNumArgs(); i != e; ++i)
ArgTypes.push_back(FTP->getArgType(i));
}
CGFunctionInfo::CGFunctionInfo(const ObjCMethodDecl *MD,
const ASTContext &Context)
: TheDecl(MD)
{
ArgTypes.push_back(MD->getResultType());
ArgTypes.push_back(MD->getSelfDecl()->getType());
ArgTypes.push_back(Context.getObjCSelType());
for (ObjCMethodDecl::param_const_iterator i = MD->param_begin(),
e = MD->param_end(); i != e; ++i)
ArgTypes.push_back((*i)->getType());
}
ArgTypeIterator CGFunctionInfo::argtypes_begin() const {
return ArgTypes.begin();
}
ArgTypeIterator CGFunctionInfo::argtypes_end() const {
return ArgTypes.end();
}
/***/
CGCallInfo::CGCallInfo(QualType _ResultType, const CallArgList &_Args) {
ArgTypes.push_back(_ResultType);
for (CallArgList::const_iterator i = _Args.begin(), e = _Args.end(); i!=e; ++i)
ArgTypes.push_back(i->second);
}
ArgTypeIterator CGCallInfo::argtypes_begin() const {
return ArgTypes.begin();
}
ArgTypeIterator CGCallInfo::argtypes_end() const {
return ArgTypes.end();
}
/***/
bool CodeGenFunction::ReturnTypeUsesSret(QualType RetTy) {
return hasAggregateLLVMType(RetTy);
}
void CodeGenFunction::ConstructParamAttrList(const Decl *TargetDecl,
ArgTypeIterator begin,
ArgTypeIterator end,
ParamAttrListType &PAL) {
unsigned FuncAttrs = 0;
if (TargetDecl) {
if (TargetDecl->getAttr<NoThrowAttr>())
FuncAttrs |= llvm::ParamAttr::NoUnwind;
if (TargetDecl->getAttr<NoReturnAttr>())
FuncAttrs |= llvm::ParamAttr::NoReturn;
}
QualType ResTy = *begin;
unsigned Index = 1;
if (CodeGenFunction::hasAggregateLLVMType(ResTy)) {
PAL.push_back(llvm::ParamAttrsWithIndex::get(Index,
llvm::ParamAttr::StructRet));
++Index;
} else if (ResTy->isPromotableIntegerType()) {
if (ResTy->isSignedIntegerType()) {
FuncAttrs |= llvm::ParamAttr::SExt;
} else if (ResTy->isUnsignedIntegerType()) {
FuncAttrs |= llvm::ParamAttr::ZExt;
}
}
if (FuncAttrs)
PAL.push_back(llvm::ParamAttrsWithIndex::get(0, FuncAttrs));
for (++begin; begin != end; ++begin, ++Index) {
QualType ParamType = *begin;
unsigned ParamAttrs = 0;
if (ParamType->isRecordType())
ParamAttrs |= llvm::ParamAttr::ByVal;
if (ParamType->isPromotableIntegerType()) {
if (ParamType->isSignedIntegerType()) {
ParamAttrs |= llvm::ParamAttr::SExt;
} else if (ParamType->isUnsignedIntegerType()) {
ParamAttrs |= llvm::ParamAttr::ZExt;
}
}
if (ParamAttrs)
PAL.push_back(llvm::ParamAttrsWithIndex::get(Index, ParamAttrs));
}
}
void CodeGenFunction::EmitFunctionProlog(llvm::Function *Fn,
QualType RetTy,
const FunctionArgList &Args) {
// Emit allocs for param decls. Give the LLVM Argument nodes names.
llvm::Function::arg_iterator AI = Fn->arg_begin();
// Name the struct return argument.
if (hasAggregateLLVMType(RetTy)) {
AI->setName("agg.result");
++AI;
}
for (FunctionArgList::const_iterator i = Args.begin(), e = Args.end();
i != e; ++i, ++AI) {
const VarDecl *Arg = i->first;
QualType T = i->second;
assert(AI != Fn->arg_end() && "Argument mismatch!");
llvm::Value* V = AI;
if (!getContext().typesAreCompatible(T, Arg->getType())) {
// This must be a promotion, for something like
// "void a(x) short x; {..."
V = EmitScalarConversion(V, T, Arg->getType());
}
EmitParmDecl(*Arg, V);
}
assert(AI == Fn->arg_end() && "Argument mismatch!");
}
void CodeGenFunction::EmitFunctionEpilog(QualType RetTy,
llvm::Value *ReturnValue) {
if (!ReturnValue) {
Builder.CreateRetVoid();
} else {
if (!hasAggregateLLVMType(RetTy)) {
Builder.CreateRet(Builder.CreateLoad(ReturnValue));
} else if (RetTy->isAnyComplexType()) {
EmitAggregateCopy(CurFn->arg_begin(), ReturnValue, RetTy);
Builder.CreateRetVoid();
} else {
EmitAggregateCopy(CurFn->arg_begin(), ReturnValue, RetTy);
Builder.CreateRetVoid();
}
}
}
RValue CodeGenFunction::EmitCall(llvm::Value *Callee,
QualType ResultType,
const CallArgList &CallArgs) {
// FIXME: Factor out code to load from args into locals into target.
llvm::SmallVector<llvm::Value*, 16> Args;
llvm::Value *TempArg0 = 0;
// Handle struct-return functions by passing a pointer to the
// location that we would like to return into.
if (hasAggregateLLVMType(ResultType)) {
// Create a temporary alloca to hold the result of the call. :(
TempArg0 = CreateTempAlloca(ConvertType(ResultType));
Args.push_back(TempArg0);
}
for (CallArgList::const_iterator I = CallArgs.begin(), E = CallArgs.end();
I != E; ++I) {
RValue RV = I->first;
if (RV.isScalar()) {
Args.push_back(RV.getScalarVal());
} else if (RV.isComplex()) {
// Make a temporary alloca to pass the argument.
Args.push_back(CreateTempAlloca(ConvertType(I->second)));
StoreComplexToAddr(RV.getComplexVal(), Args.back(), false);
} else {
Args.push_back(RV.getAggregateAddr());
}
}
llvm::CallInst *CI = Builder.CreateCall(Callee,&Args[0],&Args[0]+Args.size());
CGCallInfo CallInfo(ResultType, CallArgs);
// FIXME: Provide TargetDecl so nounwind, noreturn, etc, etc get set.
CodeGen::ParamAttrListType ParamAttrList;
ConstructParamAttrList(0, CallInfo.argtypes_begin(), CallInfo.argtypes_end(),
ParamAttrList);
CI->setParamAttrs(llvm::PAListPtr::get(ParamAttrList.begin(),
ParamAttrList.size()));
if (const llvm::Function *F = dyn_cast<llvm::Function>(Callee))
CI->setCallingConv(F->getCallingConv());
if (CI->getType() != llvm::Type::VoidTy)
CI->setName("call");
else if (ResultType->isAnyComplexType())
return RValue::getComplex(LoadComplexFromAddr(TempArg0, false));
else if (hasAggregateLLVMType(ResultType))
// Struct return.
return RValue::getAggregate(TempArg0);
else {
// void return.
assert(ResultType->isVoidType() && "Should only have a void expr here");
CI = 0;
}
return RValue::get(CI);
}
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