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//===----- CGCXXABI.cpp - Interface to C++ ABIs -----------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This provides an abstract class for C++ code generation. Concrete subclasses
// of this implement code generation for specific C++ ABIs.
//
//===----------------------------------------------------------------------===//
#include "CGCXXABI.h"
using namespace clang;
using namespace CodeGen;
CGCXXABI::~CGCXXABI() { }
static void ErrorUnsupportedABI(CodeGenFunction &CGF,
StringRef S) {
DiagnosticsEngine &Diags = CGF.CGM.getDiags();
unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
"cannot yet compile %1 in this ABI");
Diags.Report(CGF.getContext().getFullLoc(CGF.CurCodeDecl->getLocation()),
DiagID)
<< S;
}
static llvm::Constant *GetBogusMemberPointer(CodeGenModule &CGM,
QualType T) {
return llvm::Constant::getNullValue(CGM.getTypes().ConvertType(T));
}
llvm::Type *
CGCXXABI::ConvertMemberPointerType(const MemberPointerType *MPT) {
return CGM.getTypes().ConvertType(CGM.getContext().getPointerDiffType());
}
llvm::Value *CGCXXABI::EmitLoadOfMemberFunctionPointer(CodeGenFunction &CGF,
llvm::Value *&This,
llvm::Value *MemPtr,
const MemberPointerType *MPT) {
ErrorUnsupportedABI(CGF, "calls through member pointers");
const FunctionProtoType *FPT =
MPT->getPointeeType()->getAs<FunctionProtoType>();
const CXXRecordDecl *RD =
cast<CXXRecordDecl>(MPT->getClass()->getAs<RecordType>()->getDecl());
llvm::FunctionType *FTy = CGM.getTypes().GetFunctionType(
CGM.getTypes().arrangeCXXMethodType(RD, FPT));
return llvm::Constant::getNullValue(FTy->getPointerTo());
}
llvm::Value *CGCXXABI::EmitMemberDataPointerAddress(CodeGenFunction &CGF,
llvm::Value *Base,
llvm::Value *MemPtr,
const MemberPointerType *MPT) {
ErrorUnsupportedABI(CGF, "loads of member pointers");
llvm::Type *Ty = CGF.ConvertType(MPT->getPointeeType())->getPointerTo();
return llvm::Constant::getNullValue(Ty);
}
llvm::Value *CGCXXABI::EmitMemberPointerConversion(CodeGenFunction &CGF,
const CastExpr *E,
llvm::Value *Src) {
ErrorUnsupportedABI(CGF, "member function pointer conversions");
return GetBogusMemberPointer(CGM, E->getType());
}
llvm::Constant *CGCXXABI::EmitMemberPointerConversion(const CastExpr *E,
llvm::Constant *Src) {
return GetBogusMemberPointer(CGM, E->getType());
}
llvm::Value *
CGCXXABI::EmitMemberPointerComparison(CodeGenFunction &CGF,
llvm::Value *L,
llvm::Value *R,
const MemberPointerType *MPT,
bool Inequality) {
ErrorUnsupportedABI(CGF, "member function pointer comparison");
return CGF.Builder.getFalse();
}
llvm::Value *
CGCXXABI::EmitMemberPointerIsNotNull(CodeGenFunction &CGF,
llvm::Value *MemPtr,
const MemberPointerType *MPT) {
ErrorUnsupportedABI(CGF, "member function pointer null testing");
return CGF.Builder.getFalse();
}
llvm::Constant *
CGCXXABI::EmitNullMemberPointer(const MemberPointerType *MPT) {
return GetBogusMemberPointer(CGM, QualType(MPT, 0));
}
llvm::Constant *CGCXXABI::EmitMemberPointer(const CXXMethodDecl *MD) {
return GetBogusMemberPointer(CGM,
CGM.getContext().getMemberPointerType(MD->getType(),
MD->getParent()->getTypeForDecl()));
}
llvm::Constant *CGCXXABI::EmitMemberDataPointer(const MemberPointerType *MPT,
CharUnits offset) {
return GetBogusMemberPointer(CGM, QualType(MPT, 0));
}
llvm::Constant *CGCXXABI::EmitMemberPointer(const APValue &MP, QualType MPT) {
return GetBogusMemberPointer(CGM, MPT);
}
bool CGCXXABI::isZeroInitializable(const MemberPointerType *MPT) {
// Fake answer.
return true;
}
void CGCXXABI::BuildThisParam(CodeGenFunction &CGF, FunctionArgList ¶ms) {
const CXXMethodDecl *MD = cast<CXXMethodDecl>(CGF.CurGD.getDecl());
// FIXME: I'm not entirely sure I like using a fake decl just for code
// generation. Maybe we can come up with a better way?
ImplicitParamDecl *ThisDecl
= ImplicitParamDecl::Create(CGM.getContext(), 0, MD->getLocation(),
&CGM.getContext().Idents.get("this"),
MD->getThisType(CGM.getContext()));
params.push_back(ThisDecl);
getThisDecl(CGF) = ThisDecl;
}
void CGCXXABI::EmitThisParam(CodeGenFunction &CGF) {
/// Initialize the 'this' slot.
assert(getThisDecl(CGF) && "no 'this' variable for function");
getThisValue(CGF)
= CGF.Builder.CreateLoad(CGF.GetAddrOfLocalVar(getThisDecl(CGF)),
"this");
}
void CGCXXABI::EmitReturnFromThunk(CodeGenFunction &CGF,
RValue RV, QualType ResultType) {
CGF.EmitReturnOfRValue(RV, ResultType);
}
CharUnits CGCXXABI::GetArrayCookieSize(const CXXNewExpr *expr) {
return CharUnits::Zero();
}
llvm::Value *CGCXXABI::InitializeArrayCookie(CodeGenFunction &CGF,
llvm::Value *NewPtr,
llvm::Value *NumElements,
const CXXNewExpr *expr,
QualType ElementType) {
// Should never be called.
ErrorUnsupportedABI(CGF, "array cookie initialization");
return 0;
}
void CGCXXABI::ReadArrayCookie(CodeGenFunction &CGF, llvm::Value *Ptr,
const CXXDeleteExpr *expr, QualType ElementType,
llvm::Value *&NumElements,
llvm::Value *&AllocPtr, CharUnits &CookieSize) {
ErrorUnsupportedABI(CGF, "array cookie reading");
// This should be enough to avoid assertions.
NumElements = 0;
AllocPtr = llvm::Constant::getNullValue(CGF.Builder.getInt8PtrTy());
CookieSize = CharUnits::Zero();
}
void CGCXXABI::EmitGuardedInit(CodeGenFunction &CGF,
const VarDecl &D,
llvm::GlobalVariable *GV,
bool PerformInit) {
ErrorUnsupportedABI(CGF, "static local variable initialization");
}
/// Returns the adjustment, in bytes, required for the given
/// member-pointer operation. Returns null if no adjustment is
/// required.
llvm::Constant *CGCXXABI::getMemberPointerAdjustment(const CastExpr *E) {
assert(E->getCastKind() == CK_DerivedToBaseMemberPointer ||
E->getCastKind() == CK_BaseToDerivedMemberPointer);
QualType derivedType;
if (E->getCastKind() == CK_DerivedToBaseMemberPointer)
derivedType = E->getSubExpr()->getType();
else
derivedType = E->getType();
const CXXRecordDecl *derivedClass =
derivedType->castAs<MemberPointerType>()->getClass()->getAsCXXRecordDecl();
return CGM.GetNonVirtualBaseClassOffset(derivedClass,
E->path_begin(),
E->path_end());
}
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