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-rw-r--r--lib/CodeGen/MicrosoftCXXABI.cpp1289
1 files changed, 1186 insertions, 103 deletions
diff --git a/lib/CodeGen/MicrosoftCXXABI.cpp b/lib/CodeGen/MicrosoftCXXABI.cpp
index f5242ea..7318fe7 100644
--- a/lib/CodeGen/MicrosoftCXXABI.cpp
+++ b/lib/CodeGen/MicrosoftCXXABI.cpp
@@ -16,8 +16,12 @@
#include "CGCXXABI.h"
#include "CodeGenModule.h"
+#include "CGVTables.h"
+#include "MicrosoftVBTables.h"
#include "clang/AST/Decl.h"
#include "clang/AST/DeclCXX.h"
+#include "clang/AST/VTableBuilder.h"
+#include "llvm/ADT/StringSet.h"
using namespace clang;
using namespace CodeGen;
@@ -28,13 +32,15 @@ class MicrosoftCXXABI : public CGCXXABI {
public:
MicrosoftCXXABI(CodeGenModule &CGM) : CGCXXABI(CGM) {}
+ bool HasThisReturn(GlobalDecl GD) const;
+
bool isReturnTypeIndirect(const CXXRecordDecl *RD) const {
// Structures that are not C++03 PODs are always indirect.
return !RD->isPOD();
}
RecordArgABI getRecordArgABI(const CXXRecordDecl *RD) const {
- if (RD->hasNonTrivialCopyConstructor())
+ if (RD->hasNonTrivialCopyConstructor() || RD->hasNonTrivialDestructor())
return RAA_DirectInMemory;
return RAA_Default;
}
@@ -44,42 +50,153 @@ public:
// arbitrary.
StringRef GetDeletedVirtualCallName() { return "_purecall"; }
+ bool isInlineInitializedStaticDataMemberLinkOnce() { return true; }
+
llvm::Value *adjustToCompleteObject(CodeGenFunction &CGF,
llvm::Value *ptr,
QualType type);
+ llvm::Value *GetVirtualBaseClassOffset(CodeGenFunction &CGF,
+ llvm::Value *This,
+ const CXXRecordDecl *ClassDecl,
+ const CXXRecordDecl *BaseClassDecl);
+
void BuildConstructorSignature(const CXXConstructorDecl *Ctor,
CXXCtorType Type,
CanQualType &ResTy,
SmallVectorImpl<CanQualType> &ArgTys);
- llvm::BasicBlock *EmitCtorCompleteObjectHandler(CodeGenFunction &CGF);
+ llvm::BasicBlock *EmitCtorCompleteObjectHandler(CodeGenFunction &CGF,
+ const CXXRecordDecl *RD);
+
+ void initializeHiddenVirtualInheritanceMembers(CodeGenFunction &CGF,
+ const CXXRecordDecl *RD);
+
+ void EmitCXXConstructors(const CXXConstructorDecl *D);
+
+ // Background on MSVC destructors
+ // ==============================
+ //
+ // Both Itanium and MSVC ABIs have destructor variants. The variant names
+ // roughly correspond in the following way:
+ // Itanium Microsoft
+ // Base -> no name, just ~Class
+ // Complete -> vbase destructor
+ // Deleting -> scalar deleting destructor
+ // vector deleting destructor
+ //
+ // The base and complete destructors are the same as in Itanium, although the
+ // complete destructor does not accept a VTT parameter when there are virtual
+ // bases. A separate mechanism involving vtordisps is used to ensure that
+ // virtual methods of destroyed subobjects are not called.
+ //
+ // The deleting destructors accept an i32 bitfield as a second parameter. Bit
+ // 1 indicates if the memory should be deleted. Bit 2 indicates if the this
+ // pointer points to an array. The scalar deleting destructor assumes that
+ // bit 2 is zero, and therefore does not contain a loop.
+ //
+ // For virtual destructors, only one entry is reserved in the vftable, and it
+ // always points to the vector deleting destructor. The vector deleting
+ // destructor is the most general, so it can be used to destroy objects in
+ // place, delete single heap objects, or delete arrays.
+ //
+ // A TU defining a non-inline destructor is only guaranteed to emit a base
+ // destructor, and all of the other variants are emitted on an as-needed basis
+ // in COMDATs. Because a non-base destructor can be emitted in a TU that
+ // lacks a definition for the destructor, non-base destructors must always
+ // delegate to or alias the base destructor.
- void BuildDestructorSignature(const CXXDestructorDecl *Ctor,
+ void BuildDestructorSignature(const CXXDestructorDecl *Dtor,
CXXDtorType Type,
CanQualType &ResTy,
SmallVectorImpl<CanQualType> &ArgTys);
+ /// Non-base dtors should be emitted as delegating thunks in this ABI.
+ bool useThunkForDtorVariant(const CXXDestructorDecl *Dtor,
+ CXXDtorType DT) const {
+ return DT != Dtor_Base;
+ }
+
+ void EmitCXXDestructors(const CXXDestructorDecl *D);
+
+ const CXXRecordDecl *getThisArgumentTypeForMethod(const CXXMethodDecl *MD) {
+ MD = MD->getCanonicalDecl();
+ if (MD->isVirtual() && !isa<CXXDestructorDecl>(MD)) {
+ MicrosoftVTableContext::MethodVFTableLocation ML =
+ CGM.getMicrosoftVTableContext().getMethodVFTableLocation(MD);
+ // The vbases might be ordered differently in the final overrider object
+ // and the complete object, so the "this" argument may sometimes point to
+ // memory that has no particular type (e.g. past the complete object).
+ // In this case, we just use a generic pointer type.
+ // FIXME: might want to have a more precise type in the non-virtual
+ // multiple inheritance case.
+ if (ML.VBase || !ML.VFPtrOffset.isZero())
+ return 0;
+ }
+ return MD->getParent();
+ }
+
+ llvm::Value *adjustThisArgumentForVirtualCall(CodeGenFunction &CGF,
+ GlobalDecl GD,
+ llvm::Value *This);
+
void BuildInstanceFunctionParams(CodeGenFunction &CGF,
QualType &ResTy,
FunctionArgList &Params);
+ llvm::Value *adjustThisParameterInVirtualFunctionPrologue(
+ CodeGenFunction &CGF, GlobalDecl GD, llvm::Value *This);
+
void EmitInstanceFunctionProlog(CodeGenFunction &CGF);
- llvm::Value *EmitConstructorCall(CodeGenFunction &CGF,
- const CXXConstructorDecl *D,
- CXXCtorType Type, bool ForVirtualBase,
- bool Delegating,
+ void EmitConstructorCall(CodeGenFunction &CGF,
+ const CXXConstructorDecl *D, CXXCtorType Type,
+ bool ForVirtualBase, bool Delegating,
llvm::Value *This,
CallExpr::const_arg_iterator ArgBeg,
CallExpr::const_arg_iterator ArgEnd);
- RValue EmitVirtualDestructorCall(CodeGenFunction &CGF,
- const CXXDestructorDecl *Dtor,
- CXXDtorType DtorType,
- SourceLocation CallLoc,
- ReturnValueSlot ReturnValue,
- llvm::Value *This);
+ void emitVTableDefinitions(CodeGenVTables &CGVT, const CXXRecordDecl *RD);
+
+ llvm::Value *getVTableAddressPointInStructor(
+ CodeGenFunction &CGF, const CXXRecordDecl *VTableClass,
+ BaseSubobject Base, const CXXRecordDecl *NearestVBase,
+ bool &NeedsVirtualOffset);
+
+ llvm::Constant *
+ getVTableAddressPointForConstExpr(BaseSubobject Base,
+ const CXXRecordDecl *VTableClass);
+
+ llvm::GlobalVariable *getAddrOfVTable(const CXXRecordDecl *RD,
+ CharUnits VPtrOffset);
+
+ llvm::Value *getVirtualFunctionPointer(CodeGenFunction &CGF, GlobalDecl GD,
+ llvm::Value *This, llvm::Type *Ty);
+
+ void EmitVirtualDestructorCall(CodeGenFunction &CGF,
+ const CXXDestructorDecl *Dtor,
+ CXXDtorType DtorType, SourceLocation CallLoc,
+ llvm::Value *This);
+
+ void adjustCallArgsForDestructorThunk(CodeGenFunction &CGF, GlobalDecl GD,
+ CallArgList &CallArgs) {
+ assert(GD.getDtorType() == Dtor_Deleting &&
+ "Only deleting destructor thunks are available in this ABI");
+ CallArgs.add(RValue::get(getStructorImplicitParamValue(CGF)),
+ CGM.getContext().IntTy);
+ }
+
+ void emitVirtualInheritanceTables(const CXXRecordDecl *RD);
+
+ void setThunkLinkage(llvm::Function *Thunk, bool ForVTable) {
+ Thunk->setLinkage(llvm::GlobalValue::WeakAnyLinkage);
+ }
+
+ llvm::Value *performThisAdjustment(CodeGenFunction &CGF, llvm::Value *This,
+ const ThisAdjustment &TA);
+
+ llvm::Value *performReturnAdjustment(CodeGenFunction &CGF, llvm::Value *Ret,
+ const ReturnAdjustment &RA);
void EmitGuardedInit(CodeGenFunction &CGF, const VarDecl &D,
llvm::GlobalVariable *DeclPtr,
@@ -119,9 +236,12 @@ public:
llvm::Value *readArrayCookieImpl(CodeGenFunction &CGF,
llvm::Value *allocPtr,
CharUnits cookieSize);
- static bool needThisReturn(GlobalDecl GD);
private:
+ MicrosoftMangleContext &getMangleContext() {
+ return cast<MicrosoftMangleContext>(CodeGen::CGCXXABI::getMangleContext());
+ }
+
llvm::Constant *getZeroInt() {
return llvm::ConstantInt::get(CGM.IntTy, 0);
}
@@ -130,10 +250,44 @@ private:
return llvm::Constant::getAllOnesValue(CGM.IntTy);
}
+ llvm::Constant *getConstantOrZeroInt(llvm::Constant *C) {
+ return C ? C : getZeroInt();
+ }
+
+ llvm::Value *getValueOrZeroInt(llvm::Value *C) {
+ return C ? C : getZeroInt();
+ }
+
void
GetNullMemberPointerFields(const MemberPointerType *MPT,
llvm::SmallVectorImpl<llvm::Constant *> &fields);
+ /// \brief Finds the offset from the base of RD to the vbptr it uses, even if
+ /// it is reusing a vbptr from a non-virtual base. RD must have morally
+ /// virtual bases.
+ CharUnits GetVBPtrOffsetFromBases(const CXXRecordDecl *RD);
+
+ /// \brief Shared code for virtual base adjustment. Returns the offset from
+ /// the vbptr to the virtual base. Optionally returns the address of the
+ /// vbptr itself.
+ llvm::Value *GetVBaseOffsetFromVBPtr(CodeGenFunction &CGF,
+ llvm::Value *Base,
+ llvm::Value *VBPtrOffset,
+ llvm::Value *VBTableOffset,
+ llvm::Value **VBPtr = 0);
+
+ llvm::Value *GetVBaseOffsetFromVBPtr(CodeGenFunction &CGF,
+ llvm::Value *Base,
+ int32_t VBPtrOffset,
+ int32_t VBTableOffset,
+ llvm::Value **VBPtr = 0) {
+ llvm::Value *VBPOffset = llvm::ConstantInt::get(CGM.IntTy, VBPtrOffset),
+ *VBTOffset = llvm::ConstantInt::get(CGM.IntTy, VBTableOffset);
+ return GetVBaseOffsetFromVBPtr(CGF, Base, VBPOffset, VBTOffset, VBPtr);
+ }
+
+ /// \brief Performs a full virtual base adjustment. Used to dereference
+ /// pointers to members of virtual bases.
llvm::Value *AdjustVirtualBase(CodeGenFunction &CGF, const CXXRecordDecl *RD,
llvm::Value *Base,
llvm::Value *VirtualBaseAdjustmentOffset,
@@ -143,7 +297,25 @@ private:
/// function member pointers.
llvm::Constant *EmitFullMemberPointer(llvm::Constant *FirstField,
bool IsMemberFunction,
- const CXXRecordDecl *RD);
+ const CXXRecordDecl *RD,
+ CharUnits NonVirtualBaseAdjustment);
+
+ llvm::Constant *BuildMemberPointer(const CXXRecordDecl *RD,
+ const CXXMethodDecl *MD,
+ CharUnits NonVirtualBaseAdjustment);
+
+ bool MemberPointerConstantIsNull(const MemberPointerType *MPT,
+ llvm::Constant *MP);
+
+ /// \brief - Initialize all vbptrs of 'this' with RD as the complete type.
+ void EmitVBPtrStores(CodeGenFunction &CGF, const CXXRecordDecl *RD);
+
+ /// \brief Caching wrapper around VBTableBuilder::enumerateVBTables().
+ const VBTableVector &EnumerateVBTables(const CXXRecordDecl *RD);
+
+ /// \brief Generate a thunk for calling a virtual member function MD.
+ llvm::Function *EmitVirtualMemPtrThunk(const CXXMethodDecl *MD,
+ StringRef ThunkName);
public:
virtual llvm::Type *ConvertMemberPointerType(const MemberPointerType *MPT);
@@ -172,12 +344,43 @@ public:
llvm::Value *MemPtr,
const MemberPointerType *MPT);
+ virtual llvm::Value *EmitMemberPointerConversion(CodeGenFunction &CGF,
+ const CastExpr *E,
+ llvm::Value *Src);
+
+ virtual llvm::Constant *EmitMemberPointerConversion(const CastExpr *E,
+ llvm::Constant *Src);
+
virtual llvm::Value *
EmitLoadOfMemberFunctionPointer(CodeGenFunction &CGF,
llvm::Value *&This,
llvm::Value *MemPtr,
const MemberPointerType *MPT);
+private:
+ typedef std::pair<const CXXRecordDecl *, CharUnits> VFTableIdTy;
+ typedef llvm::DenseMap<VFTableIdTy, llvm::GlobalVariable *> VFTablesMapTy;
+ /// \brief All the vftables that have been referenced.
+ VFTablesMapTy VFTablesMap;
+
+ /// \brief This set holds the record decls we've deferred vtable emission for.
+ llvm::SmallPtrSet<const CXXRecordDecl *, 4> DeferredVFTables;
+
+
+ /// \brief All the vbtables which have been referenced.
+ llvm::DenseMap<const CXXRecordDecl *, VBTableVector> VBTablesMap;
+
+ /// Info on the global variable used to guard initialization of static locals.
+ /// The BitIndex field is only used for externally invisible declarations.
+ struct GuardInfo {
+ GuardInfo() : Guard(0), BitIndex(0) {}
+ llvm::GlobalVariable *Guard;
+ unsigned BitIndex;
+ };
+
+ /// Map from DeclContext to the current guard variable. We assume that the
+ /// AST is visited in source code order.
+ llvm::DenseMap<const DeclContext *, GuardInfo> GuardVariableMap;
};
}
@@ -189,19 +392,65 @@ llvm::Value *MicrosoftCXXABI::adjustToCompleteObject(CodeGenFunction &CGF,
return ptr;
}
-bool MicrosoftCXXABI::needThisReturn(GlobalDecl GD) {
- const CXXMethodDecl* MD = cast<CXXMethodDecl>(GD.getDecl());
- return isa<CXXConstructorDecl>(MD);
+/// \brief Finds the first non-virtual base of RD that has virtual bases. If RD
+/// doesn't have a vbptr, it will reuse the vbptr of the returned class.
+static const CXXRecordDecl *FindFirstNVBaseWithVBases(const CXXRecordDecl *RD) {
+ for (CXXRecordDecl::base_class_const_iterator I = RD->bases_begin(),
+ E = RD->bases_end(); I != E; ++I) {
+ const CXXRecordDecl *Base = I->getType()->getAsCXXRecordDecl();
+ if (!I->isVirtual() && Base->getNumVBases() > 0)
+ return Base;
+ }
+ llvm_unreachable("RD must have an nv base with vbases");
+}
+
+CharUnits MicrosoftCXXABI::GetVBPtrOffsetFromBases(const CXXRecordDecl *RD) {
+ assert(RD->getNumVBases());
+ CharUnits Total = CharUnits::Zero();
+ while (RD) {
+ const ASTRecordLayout &RDLayout = getContext().getASTRecordLayout(RD);
+ CharUnits VBPtrOffset = RDLayout.getVBPtrOffset();
+ // -1 is the sentinel for no vbptr.
+ if (VBPtrOffset != CharUnits::fromQuantity(-1)) {
+ Total += VBPtrOffset;
+ break;
+ }
+ RD = FindFirstNVBaseWithVBases(RD);
+ Total += RDLayout.getBaseClassOffset(RD);
+ }
+ return Total;
+}
+
+llvm::Value *
+MicrosoftCXXABI::GetVirtualBaseClassOffset(CodeGenFunction &CGF,
+ llvm::Value *This,
+ const CXXRecordDecl *ClassDecl,
+ const CXXRecordDecl *BaseClassDecl) {
+ int64_t VBPtrChars = GetVBPtrOffsetFromBases(ClassDecl).getQuantity();
+ llvm::Value *VBPtrOffset = llvm::ConstantInt::get(CGM.PtrDiffTy, VBPtrChars);
+ CharUnits IntSize = getContext().getTypeSizeInChars(getContext().IntTy);
+ CharUnits VBTableChars =
+ IntSize *
+ CGM.getMicrosoftVTableContext().getVBTableIndex(ClassDecl, BaseClassDecl);
+ llvm::Value *VBTableOffset =
+ llvm::ConstantInt::get(CGM.IntTy, VBTableChars.getQuantity());
+
+ llvm::Value *VBPtrToNewBase =
+ GetVBaseOffsetFromVBPtr(CGF, This, VBPtrOffset, VBTableOffset);
+ VBPtrToNewBase =
+ CGF.Builder.CreateSExtOrBitCast(VBPtrToNewBase, CGM.PtrDiffTy);
+ return CGF.Builder.CreateNSWAdd(VBPtrOffset, VBPtrToNewBase);
+}
+
+bool MicrosoftCXXABI::HasThisReturn(GlobalDecl GD) const {
+ return isa<CXXConstructorDecl>(GD.getDecl());
}
void MicrosoftCXXABI::BuildConstructorSignature(const CXXConstructorDecl *Ctor,
CXXCtorType Type,
CanQualType &ResTy,
SmallVectorImpl<CanQualType> &ArgTys) {
- // 'this' is already in place
-
- // Ctor returns this ptr
- ResTy = ArgTys[0];
+ // 'this' parameter and 'this' return are already in place
const CXXRecordDecl *Class = Ctor->getParent();
if (Class->getNumVBases()) {
@@ -210,13 +459,14 @@ void MicrosoftCXXABI::BuildConstructorSignature(const CXXConstructorDecl *Ctor,
}
}
-llvm::BasicBlock *MicrosoftCXXABI::EmitCtorCompleteObjectHandler(
- CodeGenFunction &CGF) {
+llvm::BasicBlock *
+MicrosoftCXXABI::EmitCtorCompleteObjectHandler(CodeGenFunction &CGF,
+ const CXXRecordDecl *RD) {
llvm::Value *IsMostDerivedClass = getStructorImplicitParamValue(CGF);
assert(IsMostDerivedClass &&
"ctor for a class with virtual bases must have an implicit parameter");
- llvm::Value *IsCompleteObject
- = CGF.Builder.CreateIsNotNull(IsMostDerivedClass, "is_complete_object");
+ llvm::Value *IsCompleteObject =
+ CGF.Builder.CreateIsNotNull(IsMostDerivedClass, "is_complete_object");
llvm::BasicBlock *CallVbaseCtorsBB = CGF.createBasicBlock("ctor.init_vbases");
llvm::BasicBlock *SkipVbaseCtorsBB = CGF.createBasicBlock("ctor.skip_vbases");
@@ -224,24 +474,200 @@ llvm::BasicBlock *MicrosoftCXXABI::EmitCtorCompleteObjectHandler(
CallVbaseCtorsBB, SkipVbaseCtorsBB);
CGF.EmitBlock(CallVbaseCtorsBB);
- // FIXME: emit vbtables somewhere around here.
+
+ // Fill in the vbtable pointers here.
+ EmitVBPtrStores(CGF, RD);
// CGF will put the base ctor calls in this basic block for us later.
return SkipVbaseCtorsBB;
}
+void MicrosoftCXXABI::initializeHiddenVirtualInheritanceMembers(
+ CodeGenFunction &CGF, const CXXRecordDecl *RD) {
+ // In most cases, an override for a vbase virtual method can adjust
+ // the "this" parameter by applying a constant offset.
+ // However, this is not enough while a constructor or a destructor of some
+ // class X is being executed if all the following conditions are met:
+ // - X has virtual bases, (1)
+ // - X overrides a virtual method M of a vbase Y, (2)
+ // - X itself is a vbase of the most derived class.
+ //
+ // If (1) and (2) are true, the vtorDisp for vbase Y is a hidden member of X
+ // which holds the extra amount of "this" adjustment we must do when we use
+ // the X vftables (i.e. during X ctor or dtor).
+ // Outside the ctors and dtors, the values of vtorDisps are zero.
+
+ const ASTRecordLayout &Layout = getContext().getASTRecordLayout(RD);
+ typedef ASTRecordLayout::VBaseOffsetsMapTy VBOffsets;
+ const VBOffsets &VBaseMap = Layout.getVBaseOffsetsMap();
+ CGBuilderTy &Builder = CGF.Builder;
+
+ unsigned AS =
+ cast<llvm::PointerType>(getThisValue(CGF)->getType())->getAddressSpace();
+ llvm::Value *Int8This = 0; // Initialize lazily.
+
+ for (VBOffsets::const_iterator I = VBaseMap.begin(), E = VBaseMap.end();
+ I != E; ++I) {
+ if (!I->second.hasVtorDisp())
+ continue;
+
+ llvm::Value *VBaseOffset =
+ GetVirtualBaseClassOffset(CGF, getThisValue(CGF), RD, I->first);
+ // FIXME: it doesn't look right that we SExt in GetVirtualBaseClassOffset()
+ // just to Trunc back immediately.
+ VBaseOffset = Builder.CreateTruncOrBitCast(VBaseOffset, CGF.Int32Ty);
+ uint64_t ConstantVBaseOffset =
+ Layout.getVBaseClassOffset(I->first).getQuantity();
+
+ // vtorDisp_for_vbase = vbptr[vbase_idx] - offsetof(RD, vbase).
+ llvm::Value *VtorDispValue = Builder.CreateSub(
+ VBaseOffset, llvm::ConstantInt::get(CGM.Int32Ty, ConstantVBaseOffset),
+ "vtordisp.value");
+
+ if (!Int8This)
+ Int8This = Builder.CreateBitCast(getThisValue(CGF),
+ CGF.Int8Ty->getPointerTo(AS));
+ llvm::Value *VtorDispPtr = Builder.CreateInBoundsGEP(Int8This, VBaseOffset);
+ // vtorDisp is always the 32-bits before the vbase in the class layout.
+ VtorDispPtr = Builder.CreateConstGEP1_32(VtorDispPtr, -4);
+ VtorDispPtr = Builder.CreateBitCast(
+ VtorDispPtr, CGF.Int32Ty->getPointerTo(AS), "vtordisp.ptr");
+
+ Builder.CreateStore(VtorDispValue, VtorDispPtr);
+ }
+}
+
+void MicrosoftCXXABI::EmitCXXConstructors(const CXXConstructorDecl *D) {
+ // There's only one constructor type in this ABI.
+ CGM.EmitGlobal(GlobalDecl(D, Ctor_Complete));
+}
+
+void MicrosoftCXXABI::EmitVBPtrStores(CodeGenFunction &CGF,
+ const CXXRecordDecl *RD) {
+ llvm::Value *ThisInt8Ptr =
+ CGF.Builder.CreateBitCast(getThisValue(CGF), CGM.Int8PtrTy, "this.int8");
+
+ const VBTableVector &VBTables = EnumerateVBTables(RD);
+ for (VBTableVector::const_iterator I = VBTables.begin(), E = VBTables.end();
+ I != E; ++I) {
+ const ASTRecordLayout &SubobjectLayout =
+ CGM.getContext().getASTRecordLayout(I->VBPtrSubobject.getBase());
+ uint64_t Offs = (I->VBPtrSubobject.getBaseOffset() +
+ SubobjectLayout.getVBPtrOffset()).getQuantity();
+ llvm::Value *VBPtr =
+ CGF.Builder.CreateConstInBoundsGEP1_64(ThisInt8Ptr, Offs);
+ VBPtr = CGF.Builder.CreateBitCast(VBPtr, I->GV->getType()->getPointerTo(0),
+ "vbptr." + I->ReusingBase->getName());
+ CGF.Builder.CreateStore(I->GV, VBPtr);
+ }
+}
+
void MicrosoftCXXABI::BuildDestructorSignature(const CXXDestructorDecl *Dtor,
CXXDtorType Type,
CanQualType &ResTy,
SmallVectorImpl<CanQualType> &ArgTys) {
// 'this' is already in place
+
// TODO: 'for base' flag
if (Type == Dtor_Deleting) {
- // The scalar deleting destructor takes an implicit bool parameter.
- ArgTys.push_back(CGM.getContext().BoolTy);
+ // The scalar deleting destructor takes an implicit int parameter.
+ ArgTys.push_back(CGM.getContext().IntTy);
+ }
+}
+
+void MicrosoftCXXABI::EmitCXXDestructors(const CXXDestructorDecl *D) {
+ // The TU defining a dtor is only guaranteed to emit a base destructor. All
+ // other destructor variants are delegating thunks.
+ CGM.EmitGlobal(GlobalDecl(D, Dtor_Base));
+}
+
+llvm::Value *MicrosoftCXXABI::adjustThisArgumentForVirtualCall(
+ CodeGenFunction &CGF, GlobalDecl GD, llvm::Value *This) {
+ GD = GD.getCanonicalDecl();
+ const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
+ // FIXME: consider splitting the vdtor vs regular method code into two
+ // functions.
+
+ GlobalDecl LookupGD = GD;
+ if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(MD)) {
+ // Complete dtors take a pointer to the complete object,
+ // thus don't need adjustment.
+ if (GD.getDtorType() == Dtor_Complete)
+ return This;
+
+ // There's only Dtor_Deleting in vftable but it shares the this adjustment
+ // with the base one, so look up the deleting one instead.
+ LookupGD = GlobalDecl(DD, Dtor_Deleting);
+ }
+ MicrosoftVTableContext::MethodVFTableLocation ML =
+ CGM.getMicrosoftVTableContext().getMethodVFTableLocation(LookupGD);
+
+ unsigned AS = cast<llvm::PointerType>(This->getType())->getAddressSpace();
+ llvm::Type *charPtrTy = CGF.Int8Ty->getPointerTo(AS);
+ CharUnits StaticOffset = ML.VFPtrOffset;
+ if (ML.VBase) {
+ bool AvoidVirtualOffset = false;
+ if (isa<CXXDestructorDecl>(MD) && GD.getDtorType() == Dtor_Base) {
+ // A base destructor can only be called from a complete destructor of the
+ // same record type or another destructor of a more derived type;
+ // or a constructor of the same record type if an exception is thrown.
+ assert(isa<CXXDestructorDecl>(CGF.CurGD.getDecl()) ||
+ isa<CXXConstructorDecl>(CGF.CurGD.getDecl()));
+ const CXXRecordDecl *CurRD =
+ cast<CXXMethodDecl>(CGF.CurGD.getDecl())->getParent();
+
+ if (MD->getParent() == CurRD) {
+ if (isa<CXXDestructorDecl>(CGF.CurGD.getDecl()))
+ assert(CGF.CurGD.getDtorType() == Dtor_Complete);
+ if (isa<CXXConstructorDecl>(CGF.CurGD.getDecl()))
+ assert(CGF.CurGD.getCtorType() == Ctor_Complete);
+ // We're calling the main base dtor from a complete structor,
+ // so we know the "this" offset statically.
+ AvoidVirtualOffset = true;
+ } else {
+ // Let's see if we try to call a destructor of a non-virtual base.
+ for (CXXRecordDecl::base_class_const_iterator I = CurRD->bases_begin(),
+ E = CurRD->bases_end(); I != E; ++I) {
+ if (I->getType()->getAsCXXRecordDecl() != MD->getParent())
+ continue;
+ // If we call a base destructor for a non-virtual base, we statically
+ // know where it expects the vfptr and "this" to be.
+ // The total offset should reflect the adjustment done by
+ // adjustThisParameterInVirtualFunctionPrologue().
+ AvoidVirtualOffset = true;
+ break;
+ }
+ }
+ }
+
+ if (AvoidVirtualOffset) {
+ const ASTRecordLayout &Layout =
+ CGF.getContext().getASTRecordLayout(MD->getParent());
+ StaticOffset += Layout.getVBaseClassOffset(ML.VBase);
+ } else {
+ This = CGF.Builder.CreateBitCast(This, charPtrTy);
+ llvm::Value *VBaseOffset =
+ GetVirtualBaseClassOffset(CGF, This, MD->getParent(), ML.VBase);
+ This = CGF.Builder.CreateInBoundsGEP(This, VBaseOffset);
+ }
+ }
+ if (!StaticOffset.isZero()) {
+ assert(StaticOffset.isPositive());
+ This = CGF.Builder.CreateBitCast(This, charPtrTy);
+ if (ML.VBase) {
+ // Non-virtual adjustment might result in a pointer outside the allocated
+ // object, e.g. if the final overrider class is laid out after the virtual
+ // base that declares a method in the most derived class.
+ // FIXME: Update the code that emits this adjustment in thunks prologues.
+ This = CGF.Builder.CreateConstGEP1_32(This, StaticOffset.getQuantity());
+ } else {
+ This = CGF.Builder.CreateConstInBoundsGEP1_32(This,
+ StaticOffset.getQuantity());
+ }
}
+ return This;
}
static bool IsDeletingDtor(GlobalDecl GD) {
@@ -256,9 +682,6 @@ void MicrosoftCXXABI::BuildInstanceFunctionParams(CodeGenFunction &CGF,
QualType &ResTy,
FunctionArgList &Params) {
BuildThisParam(CGF, Params);
- if (needThisReturn(CGF.CurGD)) {
- ResTy = Params[0]->getType();
- }
ASTContext &Context = getContext();
const CXXMethodDecl *MD = cast<CXXMethodDecl>(CGF.CurGD.getDecl());
@@ -275,17 +698,71 @@ void MicrosoftCXXABI::BuildInstanceFunctionParams(CodeGenFunction &CGF,
= ImplicitParamDecl::Create(Context, 0,
CGF.CurGD.getDecl()->getLocation(),
&Context.Idents.get("should_call_delete"),
- Context.BoolTy);
+ Context.IntTy);
Params.push_back(ShouldDelete);
getStructorImplicitParamDecl(CGF) = ShouldDelete;
}
}
+llvm::Value *MicrosoftCXXABI::adjustThisParameterInVirtualFunctionPrologue(
+ CodeGenFunction &CGF, GlobalDecl GD, llvm::Value *This) {
+ GD = GD.getCanonicalDecl();
+ const CXXMethodDecl *MD = cast<CXXMethodDecl>(GD.getDecl());
+
+ GlobalDecl LookupGD = GD;
+ if (const CXXDestructorDecl *DD = dyn_cast<CXXDestructorDecl>(MD)) {
+ // Complete destructors take a pointer to the complete object as a
+ // parameter, thus don't need this adjustment.
+ if (GD.getDtorType() == Dtor_Complete)
+ return This;
+
+ // There's no Dtor_Base in vftable but it shares the this adjustment with
+ // the deleting one, so look it up instead.
+ LookupGD = GlobalDecl(DD, Dtor_Deleting);
+ }
+
+ // In this ABI, every virtual function takes a pointer to one of the
+ // subobjects that first defines it as the 'this' parameter, rather than a
+ // pointer to ther final overrider subobject. Thus, we need to adjust it back
+ // to the final overrider subobject before use.
+ // See comments in the MicrosoftVFTableContext implementation for the details.
+
+ MicrosoftVTableContext::MethodVFTableLocation ML =
+ CGM.getMicrosoftVTableContext().getMethodVFTableLocation(LookupGD);
+ CharUnits Adjustment = ML.VFPtrOffset;
+ if (ML.VBase) {
+ const ASTRecordLayout &DerivedLayout =
+ CGF.getContext().getASTRecordLayout(MD->getParent());
+ Adjustment += DerivedLayout.getVBaseClassOffset(ML.VBase);
+ }
+
+ if (Adjustment.isZero())
+ return This;
+
+ unsigned AS = cast<llvm::PointerType>(This->getType())->getAddressSpace();
+ llvm::Type *charPtrTy = CGF.Int8Ty->getPointerTo(AS),
+ *thisTy = This->getType();
+
+ This = CGF.Builder.CreateBitCast(This, charPtrTy);
+ assert(Adjustment.isPositive());
+ This =
+ CGF.Builder.CreateConstInBoundsGEP1_32(This, -Adjustment.getQuantity());
+ return CGF.Builder.CreateBitCast(This, thisTy);
+}
+
void MicrosoftCXXABI::EmitInstanceFunctionProlog(CodeGenFunction &CGF) {
EmitThisParam(CGF);
- if (needThisReturn(CGF.CurGD)) {
+
+ /// If this is a function that the ABI specifies returns 'this', initialize
+ /// the return slot to 'this' at the start of the function.
+ ///
+ /// Unlike the setting of return types, this is done within the ABI
+ /// implementation instead of by clients of CGCXXABI because:
+ /// 1) getThisValue is currently protected
+ /// 2) in theory, an ABI could implement 'this' returns some other way;
+ /// HasThisReturn only specifies a contract, not the implementation
+ if (HasThisReturn(CGF.CurGD))
CGF.Builder.CreateStore(getThisValue(CGF), CGF.ReturnValue);
- }
const CXXMethodDecl *MD = cast<CXXMethodDecl>(CGF.CurGD.getDecl());
if (isa<CXXConstructorDecl>(MD) && MD->getParent()->getNumVBases()) {
@@ -307,9 +784,10 @@ void MicrosoftCXXABI::EmitInstanceFunctionProlog(CodeGenFunction &CGF) {
}
}
-llvm::Value *MicrosoftCXXABI::EmitConstructorCall(CodeGenFunction &CGF,
+void MicrosoftCXXABI::EmitConstructorCall(CodeGenFunction &CGF,
const CXXConstructorDecl *D,
- CXXCtorType Type, bool ForVirtualBase,
+ CXXCtorType Type,
+ bool ForVirtualBase,
bool Delegating,
llvm::Value *This,
CallExpr::const_arg_iterator ArgBeg,
@@ -326,33 +804,291 @@ llvm::Value *MicrosoftCXXABI::EmitConstructorCall(CodeGenFunction &CGF,
// FIXME: Provide a source location here.
CGF.EmitCXXMemberCall(D, SourceLocation(), Callee, ReturnValueSlot(), This,
- ImplicitParam, ImplicitParamTy,
- ArgBeg, ArgEnd);
- return Callee;
+ ImplicitParam, ImplicitParamTy, ArgBeg, ArgEnd);
+}
+
+void MicrosoftCXXABI::emitVTableDefinitions(CodeGenVTables &CGVT,
+ const CXXRecordDecl *RD) {
+ MicrosoftVTableContext &VFTContext = CGM.getMicrosoftVTableContext();
+ MicrosoftVTableContext::VFPtrListTy VFPtrs = VFTContext.getVFPtrOffsets(RD);
+ llvm::GlobalVariable::LinkageTypes Linkage = CGM.getVTableLinkage(RD);
+
+ for (MicrosoftVTableContext::VFPtrListTy::iterator I = VFPtrs.begin(),
+ E = VFPtrs.end(); I != E; ++I) {
+ llvm::GlobalVariable *VTable = getAddrOfVTable(RD, I->VFPtrFullOffset);
+ if (VTable->hasInitializer())
+ continue;
+
+ const VTableLayout &VTLayout =
+ VFTContext.getVFTableLayout(RD, I->VFPtrFullOffset);
+ llvm::Constant *Init = CGVT.CreateVTableInitializer(
+ RD, VTLayout.vtable_component_begin(),
+ VTLayout.getNumVTableComponents(), VTLayout.vtable_thunk_begin(),
+ VTLayout.getNumVTableThunks());
+ VTable->setInitializer(Init);
+
+ VTable->setLinkage(Linkage);
+ CGM.setTypeVisibility(VTable, RD, CodeGenModule::TVK_ForVTable);
+ }
+}
+
+llvm::Value *MicrosoftCXXABI::getVTableAddressPointInStructor(
+ CodeGenFunction &CGF, const CXXRecordDecl *VTableClass, BaseSubobject Base,
+ const CXXRecordDecl *NearestVBase, bool &NeedsVirtualOffset) {
+ NeedsVirtualOffset = (NearestVBase != 0);
+
+ llvm::Value *VTableAddressPoint =
+ getAddrOfVTable(VTableClass, Base.getBaseOffset());
+ if (!VTableAddressPoint) {
+ assert(Base.getBase()->getNumVBases() &&
+ !CGM.getContext().getASTRecordLayout(Base.getBase()).hasOwnVFPtr());
+ }
+ return VTableAddressPoint;
+}
+
+static void mangleVFTableName(MicrosoftMangleContext &MangleContext,
+ const CXXRecordDecl *RD, const VFPtrInfo &VFPtr,
+ SmallString<256> &Name) {
+ llvm::raw_svector_ostream Out(Name);
+ MangleContext.mangleCXXVFTable(RD, VFPtr.PathToMangle, Out);
+}
+
+llvm::Constant *MicrosoftCXXABI::getVTableAddressPointForConstExpr(
+ BaseSubobject Base, const CXXRecordDecl *VTableClass) {
+ llvm::Constant *VTable = getAddrOfVTable(VTableClass, Base.getBaseOffset());
+ assert(VTable && "Couldn't find a vftable for the given base?");
+ return VTable;
+}
+
+llvm::GlobalVariable *MicrosoftCXXABI::getAddrOfVTable(const CXXRecordDecl *RD,
+ CharUnits VPtrOffset) {
+ // getAddrOfVTable may return 0 if asked to get an address of a vtable which
+ // shouldn't be used in the given record type. We want to cache this result in
+ // VFTablesMap, thus a simple zero check is not sufficient.
+ VFTableIdTy ID(RD, VPtrOffset);
+ VFTablesMapTy::iterator I;
+ bool Inserted;
+ llvm::tie(I, Inserted) = VFTablesMap.insert(
+ std::make_pair(ID, static_cast<llvm::GlobalVariable *>(0)));
+ if (!Inserted)
+ return I->second;
+
+ llvm::GlobalVariable *&VTable = I->second;
+
+ MicrosoftVTableContext &VTContext = CGM.getMicrosoftVTableContext();
+ const MicrosoftVTableContext::VFPtrListTy &VFPtrs =
+ VTContext.getVFPtrOffsets(RD);
+
+ if (DeferredVFTables.insert(RD)) {
+ // We haven't processed this record type before.
+ // Queue up this v-table for possible deferred emission.
+ CGM.addDeferredVTable(RD);
+
+#ifndef NDEBUG
+ // Create all the vftables at once in order to make sure each vftable has
+ // a unique mangled name.
+ llvm::StringSet<> ObservedMangledNames;
+ for (size_t J = 0, F = VFPtrs.size(); J != F; ++J) {
+ SmallString<256> Name;
+ mangleVFTableName(getMangleContext(), RD, VFPtrs[J], Name);
+ if (!ObservedMangledNames.insert(Name.str()))
+ llvm_unreachable("Already saw this mangling before?");
+ }
+#endif
+ }
+
+ for (size_t J = 0, F = VFPtrs.size(); J != F; ++J) {
+ if (VFPtrs[J].VFPtrFullOffset != VPtrOffset)
+ continue;
+
+ llvm::ArrayType *ArrayType = llvm::ArrayType::get(
+ CGM.Int8PtrTy,
+ VTContext.getVFTableLayout(RD, VFPtrs[J].VFPtrFullOffset)
+ .getNumVTableComponents());
+
+ SmallString<256> Name;
+ mangleVFTableName(getMangleContext(), RD, VFPtrs[J], Name);
+ VTable = CGM.CreateOrReplaceCXXRuntimeVariable(
+ Name.str(), ArrayType, llvm::GlobalValue::ExternalLinkage);
+ VTable->setUnnamedAddr(true);
+ break;
+ }
+
+ return VTable;
}
-RValue MicrosoftCXXABI::EmitVirtualDestructorCall(CodeGenFunction &CGF,
- const CXXDestructorDecl *Dtor,
- CXXDtorType DtorType,
- SourceLocation CallLoc,
- ReturnValueSlot ReturnValue,
- llvm::Value *This) {
+llvm::Value *MicrosoftCXXABI::getVirtualFunctionPointer(CodeGenFunction &CGF,
+ GlobalDecl GD,
+ llvm::Value *This,
+ llvm::Type *Ty) {
+ GD = GD.getCanonicalDecl();
+ CGBuilderTy &Builder = CGF.Builder;
+
+ Ty = Ty->getPointerTo()->getPointerTo();
+ llvm::Value *VPtr = adjustThisArgumentForVirtualCall(CGF, GD, This);
+ llvm::Value *VTable = CGF.GetVTablePtr(VPtr, Ty);
+
+ MicrosoftVTableContext::MethodVFTableLocation ML =
+ CGM.getMicrosoftVTableContext().getMethodVFTableLocation(GD);
+ llvm::Value *VFuncPtr =
+ Builder.CreateConstInBoundsGEP1_64(VTable, ML.Index, "vfn");
+ return Builder.CreateLoad(VFuncPtr);
+}
+
+void MicrosoftCXXABI::EmitVirtualDestructorCall(CodeGenFunction &CGF,
+ const CXXDestructorDecl *Dtor,
+ CXXDtorType DtorType,
+ SourceLocation CallLoc,
+ llvm::Value *This) {
assert(DtorType == Dtor_Deleting || DtorType == Dtor_Complete);
// We have only one destructor in the vftable but can get both behaviors
- // by passing an implicit bool parameter.
- const CGFunctionInfo *FInfo
- = &CGM.getTypes().arrangeCXXDestructor(Dtor, Dtor_Deleting);
+ // by passing an implicit int parameter.
+ GlobalDecl GD(Dtor, Dtor_Deleting);
+ const CGFunctionInfo *FInfo =
+ &CGM.getTypes().arrangeCXXDestructor(Dtor, Dtor_Deleting);
llvm::Type *Ty = CGF.CGM.getTypes().GetFunctionType(*FInfo);
- llvm::Value *Callee = CGF.BuildVirtualCall(Dtor, Dtor_Deleting, This, Ty);
+ llvm::Value *Callee = getVirtualFunctionPointer(CGF, GD, This, Ty);
ASTContext &Context = CGF.getContext();
- llvm::Value *ImplicitParam
- = llvm::ConstantInt::get(llvm::IntegerType::getInt1Ty(CGF.getLLVMContext()),
+ llvm::Value *ImplicitParam =
+ llvm::ConstantInt::get(llvm::IntegerType::getInt32Ty(CGF.getLLVMContext()),
DtorType == Dtor_Deleting);
- return CGF.EmitCXXMemberCall(Dtor, CallLoc, Callee, ReturnValue, This,
- ImplicitParam, Context.BoolTy, 0, 0);
+ This = adjustThisArgumentForVirtualCall(CGF, GD, This);
+ CGF.EmitCXXMemberCall(Dtor, CallLoc, Callee, ReturnValueSlot(), This,
+ ImplicitParam, Context.IntTy, 0, 0);
+}
+
+const VBTableVector &
+MicrosoftCXXABI::EnumerateVBTables(const CXXRecordDecl *RD) {
+ // At this layer, we can key the cache off of a single class, which is much
+ // easier than caching at the GlobalVariable layer.
+ llvm::DenseMap<const CXXRecordDecl*, VBTableVector>::iterator I;
+ bool added;
+ llvm::tie(I, added) = VBTablesMap.insert(std::make_pair(RD, VBTableVector()));
+ VBTableVector &VBTables = I->second;
+ if (!added)
+ return VBTables;
+
+ VBTableBuilder(CGM, RD).enumerateVBTables(VBTables);
+
+ return VBTables;
+}
+
+llvm::Function *
+MicrosoftCXXABI::EmitVirtualMemPtrThunk(const CXXMethodDecl *MD,
+ StringRef ThunkName) {
+ // If the thunk has been generated previously, just return it.
+ if (llvm::GlobalValue *GV = CGM.getModule().getNamedValue(ThunkName))
+ return cast<llvm::Function>(GV);
+
+ // Create the llvm::Function.
+ const CGFunctionInfo &FnInfo = CGM.getTypes().arrangeGlobalDeclaration(MD);
+ llvm::FunctionType *ThunkTy = CGM.getTypes().GetFunctionType(FnInfo);
+ llvm::Function *ThunkFn =
+ llvm::Function::Create(ThunkTy, llvm::Function::ExternalLinkage,
+ ThunkName.str(), &CGM.getModule());
+ assert(ThunkFn->getName() == ThunkName && "name was uniqued!");
+
+ ThunkFn->setLinkage(MD->isExternallyVisible()
+ ? llvm::GlobalValue::LinkOnceODRLinkage
+ : llvm::GlobalValue::InternalLinkage);
+
+ CGM.SetLLVMFunctionAttributes(MD, FnInfo, ThunkFn);
+ CGM.SetLLVMFunctionAttributesForDefinition(MD, ThunkFn);
+
+ // Start codegen.
+ CodeGenFunction CGF(CGM);
+ CGF.StartThunk(ThunkFn, MD, FnInfo);
+
+ // Get to the Callee.
+ llvm::Value *This = CGF.LoadCXXThis();
+ llvm::Value *Callee = getVirtualFunctionPointer(CGF, MD, This, ThunkTy);
+
+ // Make the call and return the result.
+ CGF.EmitCallAndReturnForThunk(MD, Callee, 0);
+
+ return ThunkFn;
+}
+
+void MicrosoftCXXABI::emitVirtualInheritanceTables(const CXXRecordDecl *RD) {
+ const VBTableVector &VBTables = EnumerateVBTables(RD);
+ llvm::GlobalVariable::LinkageTypes Linkage = CGM.getVTableLinkage(RD);
+
+ for (VBTableVector::const_iterator I = VBTables.begin(), E = VBTables.end();
+ I != E; ++I) {
+ I->EmitVBTableDefinition(CGM, RD, Linkage);
+ }
+}
+
+llvm::Value *MicrosoftCXXABI::performThisAdjustment(CodeGenFunction &CGF,
+ llvm::Value *This,
+ const ThisAdjustment &TA) {
+ if (TA.isEmpty())
+ return This;
+
+ llvm::Value *V = CGF.Builder.CreateBitCast(This, CGF.Int8PtrTy);
+
+ if (!TA.Virtual.isEmpty()) {
+ assert(TA.Virtual.Microsoft.VtordispOffset < 0);
+ // Adjust the this argument based on the vtordisp value.
+ llvm::Value *VtorDispPtr =
+ CGF.Builder.CreateConstGEP1_32(V, TA.Virtual.Microsoft.VtordispOffset);
+ VtorDispPtr =
+ CGF.Builder.CreateBitCast(VtorDispPtr, CGF.Int32Ty->getPointerTo());
+ llvm::Value *VtorDisp = CGF.Builder.CreateLoad(VtorDispPtr, "vtordisp");
+ V = CGF.Builder.CreateGEP(V, CGF.Builder.CreateNeg(VtorDisp));
+
+ if (TA.Virtual.Microsoft.VBPtrOffset) {
+ // If the final overrider is defined in a virtual base other than the one
+ // that holds the vfptr, we have to use a vtordispex thunk which looks up
+ // the vbtable of the derived class.
+ assert(TA.Virtual.Microsoft.VBPtrOffset > 0);
+ assert(TA.Virtual.Microsoft.VBOffsetOffset >= 0);
+ llvm::Value *VBPtr;
+ llvm::Value *VBaseOffset =
+ GetVBaseOffsetFromVBPtr(CGF, V, -TA.Virtual.Microsoft.VBPtrOffset,
+ TA.Virtual.Microsoft.VBOffsetOffset, &VBPtr);
+ V = CGF.Builder.CreateInBoundsGEP(VBPtr, VBaseOffset);
+ }
+ }
+
+ if (TA.NonVirtual) {
+ // Non-virtual adjustment might result in a pointer outside the allocated
+ // object, e.g. if the final overrider class is laid out after the virtual
+ // base that declares a method in the most derived class.
+ V = CGF.Builder.CreateConstGEP1_32(V, TA.NonVirtual);
+ }
+
+ // Don't need to bitcast back, the call CodeGen will handle this.
+ return V;
+}
+
+llvm::Value *
+MicrosoftCXXABI::performReturnAdjustment(CodeGenFunction &CGF, llvm::Value *Ret,
+ const ReturnAdjustment &RA) {
+ if (RA.isEmpty())
+ return Ret;
+
+ llvm::Value *V = CGF.Builder.CreateBitCast(Ret, CGF.Int8PtrTy);
+
+ if (RA.Virtual.Microsoft.VBIndex) {
+ assert(RA.Virtual.Microsoft.VBIndex > 0);
+ int32_t IntSize =
+ getContext().getTypeSizeInChars(getContext().IntTy).getQuantity();
+ llvm::Value *VBPtr;
+ llvm::Value *VBaseOffset =
+ GetVBaseOffsetFromVBPtr(CGF, V, RA.Virtual.Microsoft.VBPtrOffset,
+ IntSize * RA.Virtual.Microsoft.VBIndex, &VBPtr);
+ V = CGF.Builder.CreateInBoundsGEP(VBPtr, VBaseOffset);
+ }
+
+ if (RA.NonVirtual)
+ V = CGF.Builder.CreateConstInBoundsGEP1_32(V, RA.NonVirtual);
+
+ // Cast back to the original type.
+ return CGF.Builder.CreateBitCast(V, Ret->getType());
}
bool MicrosoftCXXABI::requiresArrayCookie(const CXXDeleteExpr *expr,
@@ -411,17 +1147,86 @@ llvm::Value* MicrosoftCXXABI::InitializeArrayCookie(CodeGenFunction &CGF,
}
void MicrosoftCXXABI::EmitGuardedInit(CodeGenFunction &CGF, const VarDecl &D,
- llvm::GlobalVariable *DeclPtr,
+ llvm::GlobalVariable *GV,
bool PerformInit) {
- // FIXME: this code was only tested for global initialization.
- // Not sure whether we want thread-safe static local variables as VS
- // doesn't make them thread-safe.
+ // MSVC always uses an i32 bitfield to guard initialization, which is *not*
+ // threadsafe. Since the user may be linking in inline functions compiled by
+ // cl.exe, there's no reason to provide a false sense of security by using
+ // critical sections here.
if (D.getTLSKind())
CGM.ErrorUnsupported(&D, "dynamic TLS initialization");
- // Emit the initializer and add a global destructor if appropriate.
- CGF.EmitCXXGlobalVarDeclInit(D, DeclPtr, PerformInit);
+ CGBuilderTy &Builder = CGF.Builder;
+ llvm::IntegerType *GuardTy = CGF.Int32Ty;
+ llvm::ConstantInt *Zero = llvm::ConstantInt::get(GuardTy, 0);
+
+ // Get the guard variable for this function if we have one already.
+ GuardInfo &GI = GuardVariableMap[D.getDeclContext()];
+
+ unsigned BitIndex;
+ if (D.isExternallyVisible()) {
+ // Externally visible variables have to be numbered in Sema to properly
+ // handle unreachable VarDecls.
+ BitIndex = getContext().getManglingNumber(&D);
+ assert(BitIndex > 0);
+ BitIndex--;
+ } else {
+ // Non-externally visible variables are numbered here in CodeGen.
+ BitIndex = GI.BitIndex++;
+ }
+
+ if (BitIndex >= 32) {
+ if (D.isExternallyVisible())
+ ErrorUnsupportedABI(CGF, "more than 32 guarded initializations");
+ BitIndex %= 32;
+ GI.Guard = 0;
+ }
+
+ // Lazily create the i32 bitfield for this function.
+ if (!GI.Guard) {
+ // Mangle the name for the guard.
+ SmallString<256> GuardName;
+ {
+ llvm::raw_svector_ostream Out(GuardName);
+ getMangleContext().mangleStaticGuardVariable(&D, Out);
+ Out.flush();
+ }
+
+ // Create the guard variable with a zero-initializer. Just absorb linkage
+ // and visibility from the guarded variable.
+ GI.Guard = new llvm::GlobalVariable(CGM.getModule(), GuardTy, false,
+ GV->getLinkage(), Zero, GuardName.str());
+ GI.Guard->setVisibility(GV->getVisibility());
+ } else {
+ assert(GI.Guard->getLinkage() == GV->getLinkage() &&
+ "static local from the same function had different linkage");
+ }
+
+ // Pseudo code for the test:
+ // if (!(GuardVar & MyGuardBit)) {
+ // GuardVar |= MyGuardBit;
+ // ... initialize the object ...;
+ // }
+
+ // Test our bit from the guard variable.
+ llvm::ConstantInt *Bit = llvm::ConstantInt::get(GuardTy, 1U << BitIndex);
+ llvm::LoadInst *LI = Builder.CreateLoad(GI.Guard);
+ llvm::Value *IsInitialized =
+ Builder.CreateICmpNE(Builder.CreateAnd(LI, Bit), Zero);
+ llvm::BasicBlock *InitBlock = CGF.createBasicBlock("init");
+ llvm::BasicBlock *EndBlock = CGF.createBasicBlock("init.end");
+ Builder.CreateCondBr(IsInitialized, EndBlock, InitBlock);
+
+ // Set our bit in the guard variable and emit the initializer and add a global
+ // destructor if appropriate.
+ CGF.EmitBlock(InitBlock);
+ Builder.CreateStore(Builder.CreateOr(LI, Bit), GI.Guard);
+ CGF.EmitCXXGlobalVarDeclInit(D, GV, PerformInit);
+ Builder.CreateBr(EndBlock);
+
+ // Continue.
+ CGF.EmitBlock(EndBlock);
}
// Member pointer helpers.
@@ -429,8 +1234,10 @@ static bool hasVBPtrOffsetField(MSInheritanceModel Inheritance) {
return Inheritance == MSIM_Unspecified;
}
-static bool hasOnlyOneField(MSInheritanceModel Inheritance) {
- return Inheritance <= MSIM_SinglePolymorphic;
+static bool hasOnlyOneField(bool IsMemberFunction,
+ MSInheritanceModel Inheritance) {
+ return Inheritance <= MSIM_SinglePolymorphic ||
+ (!IsMemberFunction && Inheritance <= MSIM_MultiplePolymorphic);
}
// Only member pointers to functions need a this adjustment, since it can be
@@ -531,27 +1338,28 @@ MicrosoftCXXABI::EmitNullMemberPointer(const MemberPointerType *MPT) {
llvm::Constant *
MicrosoftCXXABI::EmitFullMemberPointer(llvm::Constant *FirstField,
bool IsMemberFunction,
- const CXXRecordDecl *RD)
+ const CXXRecordDecl *RD,
+ CharUnits NonVirtualBaseAdjustment)
{
MSInheritanceModel Inheritance = RD->getMSInheritanceModel();
// Single inheritance class member pointer are represented as scalars instead
// of aggregates.
- if (hasOnlyOneField(Inheritance))
+ if (hasOnlyOneField(IsMemberFunction, Inheritance))
return FirstField;
llvm::SmallVector<llvm::Constant *, 4> fields;
fields.push_back(FirstField);
if (hasNonVirtualBaseAdjustmentField(IsMemberFunction, Inheritance))
- fields.push_back(getZeroInt());
+ fields.push_back(llvm::ConstantInt::get(
+ CGM.IntTy, NonVirtualBaseAdjustment.getQuantity()));
if (hasVBPtrOffsetField(Inheritance)) {
- int64_t VBPtrOffset =
- getContext().getASTRecordLayout(RD).getVBPtrOffset().getQuantity();
- if (VBPtrOffset == -1)
- VBPtrOffset = 0;
- fields.push_back(llvm::ConstantInt::get(CGM.IntTy, VBPtrOffset));
+ CharUnits Offs = CharUnits::Zero();
+ if (RD->getNumVBases())
+ Offs = GetVBPtrOffsetFromBases(RD);
+ fields.push_back(llvm::ConstantInt::get(CGM.IntTy, Offs.getQuantity()));
}
// The rest of the fields are adjusted by conversions to a more derived class.
@@ -567,22 +1375,44 @@ MicrosoftCXXABI::EmitMemberDataPointer(const MemberPointerType *MPT,
const CXXRecordDecl *RD = MPT->getClass()->getAsCXXRecordDecl();
llvm::Constant *FirstField =
llvm::ConstantInt::get(CGM.IntTy, offset.getQuantity());
- return EmitFullMemberPointer(FirstField, /*IsMemberFunction=*/false, RD);
+ return EmitFullMemberPointer(FirstField, /*IsMemberFunction=*/false, RD,
+ CharUnits::Zero());
+}
+
+llvm::Constant *MicrosoftCXXABI::EmitMemberPointer(const CXXMethodDecl *MD) {
+ return BuildMemberPointer(MD->getParent(), MD, CharUnits::Zero());
+}
+
+llvm::Constant *MicrosoftCXXABI::EmitMemberPointer(const APValue &MP,
+ QualType MPType) {
+ const MemberPointerType *MPT = MPType->castAs<MemberPointerType>();
+ const ValueDecl *MPD = MP.getMemberPointerDecl();
+ if (!MPD)
+ return EmitNullMemberPointer(MPT);
+
+ CharUnits ThisAdjustment = getMemberPointerPathAdjustment(MP);
+
+ // FIXME PR15713: Support virtual inheritance paths.
+
+ if (const CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(MPD))
+ return BuildMemberPointer(MPT->getClass()->getAsCXXRecordDecl(),
+ MD, ThisAdjustment);
+
+ CharUnits FieldOffset =
+ getContext().toCharUnitsFromBits(getContext().getFieldOffset(MPD));
+ return EmitMemberDataPointer(MPT, ThisAdjustment + FieldOffset);
}
llvm::Constant *
-MicrosoftCXXABI::EmitMemberPointer(const CXXMethodDecl *MD) {
+MicrosoftCXXABI::BuildMemberPointer(const CXXRecordDecl *RD,
+ const CXXMethodDecl *MD,
+ CharUnits NonVirtualBaseAdjustment) {
assert(MD->isInstance() && "Member function must not be static!");
MD = MD->getCanonicalDecl();
- const CXXRecordDecl *RD = MD->getParent();
CodeGenTypes &Types = CGM.getTypes();
llvm::Constant *FirstField;
- if (MD->isVirtual()) {
- // FIXME: We have to instantiate a thunk that loads the vftable and jumps to
- // the right offset.
- FirstField = llvm::Constant::getNullValue(CGM.VoidPtrTy);
- } else {
+ if (!MD->isVirtual()) {
const FunctionProtoType *FPT = MD->getType()->castAs<FunctionProtoType>();
llvm::Type *Ty;
// Check whether the function has a computable LLVM signature.
@@ -596,18 +1426,38 @@ MicrosoftCXXABI::EmitMemberPointer(const CXXMethodDecl *MD) {
}
FirstField = CGM.GetAddrOfFunction(MD, Ty);
FirstField = llvm::ConstantExpr::getBitCast(FirstField, CGM.VoidPtrTy);
+ } else {
+ MicrosoftVTableContext::MethodVFTableLocation ML =
+ CGM.getMicrosoftVTableContext().getMethodVFTableLocation(MD);
+ if (MD->isVariadic()) {
+ CGM.ErrorUnsupported(MD, "pointer to variadic virtual member function");
+ FirstField = llvm::Constant::getNullValue(CGM.VoidPtrTy);
+ } else if (!CGM.getTypes().isFuncTypeConvertible(
+ MD->getType()->castAs<FunctionType>())) {
+ CGM.ErrorUnsupported(MD, "pointer to virtual member function with "
+ "incomplete return or parameter type");
+ FirstField = llvm::Constant::getNullValue(CGM.VoidPtrTy);
+ } else if (ML.VBase) {
+ CGM.ErrorUnsupported(MD, "pointer to virtual member function overriding "
+ "member function in virtual base class");
+ FirstField = llvm::Constant::getNullValue(CGM.VoidPtrTy);
+ } else {
+ SmallString<256> ThunkName;
+ CharUnits PointerWidth = getContext().toCharUnitsFromBits(
+ getContext().getTargetInfo().getPointerWidth(0));
+ uint64_t OffsetInVFTable = ML.Index * PointerWidth.getQuantity();
+ llvm::raw_svector_ostream Out(ThunkName);
+ getMangleContext().mangleVirtualMemPtrThunk(MD, OffsetInVFTable, Out);
+ Out.flush();
+
+ llvm::Function *Thunk = EmitVirtualMemPtrThunk(MD, ThunkName.str());
+ FirstField = llvm::ConstantExpr::getBitCast(Thunk, CGM.VoidPtrTy);
+ }
}
// The rest of the fields are common with data member pointers.
- return EmitFullMemberPointer(FirstField, /*IsMemberFunction=*/true, RD);
-}
-
-llvm::Constant *
-MicrosoftCXXABI::EmitMemberPointer(const APValue &MP, QualType MPT) {
- // FIXME PR15875: Implement member pointer conversions for Constants.
- const CXXRecordDecl *RD = MPT->castAs<MemberPointerType>()->getClass()->getAsCXXRecordDecl();
- return EmitFullMemberPointer(llvm::Constant::getNullValue(CGM.VoidPtrTy),
- /*IsMemberFunction=*/true, RD);
+ return EmitFullMemberPointer(FirstField, /*IsMemberFunction=*/true, RD,
+ NonVirtualBaseAdjustment);
}
/// Member pointers are the same if they're either bitwise identical *or* both
@@ -638,7 +1488,7 @@ MicrosoftCXXABI::EmitMemberPointerComparison(CodeGenFunction &CGF,
// single icmp.
const CXXRecordDecl *RD = MPT->getClass()->getAsCXXRecordDecl();
MSInheritanceModel Inheritance = RD->getMSInheritanceModel();
- if (hasOnlyOneField(Inheritance))
+ if (hasOnlyOneField(MPT->isMemberFunctionPointer(), Inheritance))
return Builder.CreateICmp(Eq, L, R);
// Compare the first field.
@@ -703,12 +1553,64 @@ MicrosoftCXXABI::EmitMemberPointerIsNotNull(CodeGenFunction &CGF,
return Res;
}
+bool MicrosoftCXXABI::MemberPointerConstantIsNull(const MemberPointerType *MPT,
+ llvm::Constant *Val) {
+ // Function pointers are null if the pointer in the first field is null.
+ if (MPT->isMemberFunctionPointer()) {
+ llvm::Constant *FirstField = Val->getType()->isStructTy() ?
+ Val->getAggregateElement(0U) : Val;
+ return FirstField->isNullValue();
+ }
+
+ // If it's not a function pointer and it's zero initializable, we can easily
+ // check zero.
+ if (isZeroInitializable(MPT) && Val->isNullValue())
+ return true;
+
+ // Otherwise, break down all the fields for comparison. Hopefully these
+ // little Constants are reused, while a big null struct might not be.
+ llvm::SmallVector<llvm::Constant *, 4> Fields;
+ GetNullMemberPointerFields(MPT, Fields);
+ if (Fields.size() == 1) {
+ assert(Val->getType()->isIntegerTy());
+ return Val == Fields[0];
+ }
+
+ unsigned I, E;
+ for (I = 0, E = Fields.size(); I != E; ++I) {
+ if (Val->getAggregateElement(I) != Fields[I])
+ break;
+ }
+ return I == E;
+}
+
+llvm::Value *
+MicrosoftCXXABI::GetVBaseOffsetFromVBPtr(CodeGenFunction &CGF,
+ llvm::Value *This,
+ llvm::Value *VBPtrOffset,
+ llvm::Value *VBTableOffset,
+ llvm::Value **VBPtrOut) {
+ CGBuilderTy &Builder = CGF.Builder;
+ // Load the vbtable pointer from the vbptr in the instance.
+ This = Builder.CreateBitCast(This, CGM.Int8PtrTy);
+ llvm::Value *VBPtr =
+ Builder.CreateInBoundsGEP(This, VBPtrOffset, "vbptr");
+ if (VBPtrOut) *VBPtrOut = VBPtr;
+ VBPtr = Builder.CreateBitCast(VBPtr, CGM.Int8PtrTy->getPointerTo(0));
+ llvm::Value *VBTable = Builder.CreateLoad(VBPtr, "vbtable");
+
+ // Load an i32 offset from the vb-table.
+ llvm::Value *VBaseOffs = Builder.CreateInBoundsGEP(VBTable, VBTableOffset);
+ VBaseOffs = Builder.CreateBitCast(VBaseOffs, CGM.Int32Ty->getPointerTo(0));
+ return Builder.CreateLoad(VBaseOffs, "vbase_offs");
+}
+
// Returns an adjusted base cast to i8*, since we do more address arithmetic on
// it.
llvm::Value *
MicrosoftCXXABI::AdjustVirtualBase(CodeGenFunction &CGF,
const CXXRecordDecl *RD, llvm::Value *Base,
- llvm::Value *VirtualBaseAdjustmentOffset,
+ llvm::Value *VBTableOffset,
llvm::Value *VBPtrOffset) {
CGBuilderTy &Builder = CGF.Builder;
Base = Builder.CreateBitCast(Base, CGM.Int8PtrTy);
@@ -725,7 +1627,7 @@ MicrosoftCXXABI::AdjustVirtualBase(CodeGenFunction &CGF,
VBaseAdjustBB = CGF.createBasicBlock("memptr.vadjust");
SkipAdjustBB = CGF.createBasicBlock("memptr.skip_vadjust");
llvm::Value *IsVirtual =
- Builder.CreateICmpNE(VirtualBaseAdjustmentOffset, getZeroInt(),
+ Builder.CreateICmpNE(VBTableOffset, getZeroInt(),
"memptr.is_vbase");
Builder.CreateCondBr(IsVirtual, VBaseAdjustBB, SkipAdjustBB);
CGF.EmitBlock(VBaseAdjustBB);
@@ -734,21 +1636,15 @@ MicrosoftCXXABI::AdjustVirtualBase(CodeGenFunction &CGF,
// If we weren't given a dynamic vbptr offset, RD should be complete and we'll
// know the vbptr offset.
if (!VBPtrOffset) {
- CharUnits offs = getContext().getASTRecordLayout(RD).getVBPtrOffset();
+ CharUnits offs = CharUnits::Zero();
+ if (RD->getNumVBases()) {
+ offs = GetVBPtrOffsetFromBases(RD);
+ }
VBPtrOffset = llvm::ConstantInt::get(CGM.IntTy, offs.getQuantity());
}
- // Load the vbtable pointer from the vbtable offset in the instance.
- llvm::Value *VBPtr =
- Builder.CreateInBoundsGEP(Base, VBPtrOffset, "memptr.vbptr");
- llvm::Value *VBTable =
- Builder.CreateBitCast(VBPtr, CGM.Int8PtrTy->getPointerTo(0));
- VBTable = Builder.CreateLoad(VBTable, "memptr.vbtable");
- // Load an i32 offset from the vb-table.
+ llvm::Value *VBPtr = 0;
llvm::Value *VBaseOffs =
- Builder.CreateInBoundsGEP(VBTable, VirtualBaseAdjustmentOffset);
- VBaseOffs = Builder.CreateBitCast(VBaseOffs, CGM.Int32Ty->getPointerTo(0));
- VBaseOffs = Builder.CreateLoad(VBaseOffs, "memptr.vbase_offs");
- // Add it to VBPtr. GEP will sign extend the i32 value for us.
+ GetVBaseOffsetFromVBPtr(CGF, Base, VBPtrOffset, VBTableOffset, &VBPtr);
llvm::Value *AdjustedBase = Builder.CreateInBoundsGEP(VBPtr, VBaseOffs);
// Merge control flow with the case where we didn't have to adjust.
@@ -803,6 +1699,194 @@ MicrosoftCXXABI::EmitMemberDataPointerAddress(CodeGenFunction &CGF,
return Builder.CreateBitCast(Addr, PType);
}
+static MSInheritanceModel
+getInheritanceFromMemptr(const MemberPointerType *MPT) {
+ return MPT->getClass()->getAsCXXRecordDecl()->getMSInheritanceModel();
+}
+
+llvm::Value *
+MicrosoftCXXABI::EmitMemberPointerConversion(CodeGenFunction &CGF,
+ const CastExpr *E,
+ llvm::Value *Src) {
+ assert(E->getCastKind() == CK_DerivedToBaseMemberPointer ||
+ E->getCastKind() == CK_BaseToDerivedMemberPointer ||
+ E->getCastKind() == CK_ReinterpretMemberPointer);
+
+ // Use constant emission if we can.
+ if (isa<llvm::Constant>(Src))
+ return EmitMemberPointerConversion(E, cast<llvm::Constant>(Src));
+
+ // We may be adding or dropping fields from the member pointer, so we need
+ // both types and the inheritance models of both records.
+ const MemberPointerType *SrcTy =
+ E->getSubExpr()->getType()->castAs<MemberPointerType>();
+ const MemberPointerType *DstTy = E->getType()->castAs<MemberPointerType>();
+ MSInheritanceModel SrcInheritance = getInheritanceFromMemptr(SrcTy);
+ MSInheritanceModel DstInheritance = getInheritanceFromMemptr(DstTy);
+ bool IsFunc = SrcTy->isMemberFunctionPointer();
+
+ // If the classes use the same null representation, reinterpret_cast is a nop.
+ bool IsReinterpret = E->getCastKind() == CK_ReinterpretMemberPointer;
+ if (IsReinterpret && (IsFunc ||
+ nullFieldOffsetIsZero(SrcInheritance) ==
+ nullFieldOffsetIsZero(DstInheritance)))
+ return Src;
+
+ CGBuilderTy &Builder = CGF.Builder;
+
+ // Branch past the conversion if Src is null.
+ llvm::Value *IsNotNull = EmitMemberPointerIsNotNull(CGF, Src, SrcTy);
+ llvm::Constant *DstNull = EmitNullMemberPointer(DstTy);
+
+ // C++ 5.2.10p9: The null member pointer value is converted to the null member
+ // pointer value of the destination type.
+ if (IsReinterpret) {
+ // For reinterpret casts, sema ensures that src and dst are both functions
+ // or data and have the same size, which means the LLVM types should match.
+ assert(Src->getType() == DstNull->getType());
+ return Builder.CreateSelect(IsNotNull, Src, DstNull);
+ }
+
+ llvm::BasicBlock *OriginalBB = Builder.GetInsertBlock();
+ llvm::BasicBlock *ConvertBB = CGF.createBasicBlock("memptr.convert");
+ llvm::BasicBlock *ContinueBB = CGF.createBasicBlock("memptr.converted");
+ Builder.CreateCondBr(IsNotNull, ConvertBB, ContinueBB);
+ CGF.EmitBlock(ConvertBB);
+
+ // Decompose src.
+ llvm::Value *FirstField = Src;
+ llvm::Value *NonVirtualBaseAdjustment = 0;
+ llvm::Value *VirtualBaseAdjustmentOffset = 0;
+ llvm::Value *VBPtrOffset = 0;
+ if (!hasOnlyOneField(IsFunc, SrcInheritance)) {
+ // We need to extract values.
+ unsigned I = 0;
+ FirstField = Builder.CreateExtractValue(Src, I++);
+ if (hasNonVirtualBaseAdjustmentField(IsFunc, SrcInheritance))
+ NonVirtualBaseAdjustment = Builder.CreateExtractValue(Src, I++);
+ if (hasVBPtrOffsetField(SrcInheritance))
+ VBPtrOffset = Builder.CreateExtractValue(Src, I++);
+ if (hasVirtualBaseAdjustmentField(SrcInheritance))
+ VirtualBaseAdjustmentOffset = Builder.CreateExtractValue(Src, I++);
+ }
+
+ // For data pointers, we adjust the field offset directly. For functions, we
+ // have a separate field.
+ llvm::Constant *Adj = getMemberPointerAdjustment(E);
+ if (Adj) {
+ Adj = llvm::ConstantExpr::getTruncOrBitCast(Adj, CGM.IntTy);
+ llvm::Value *&NVAdjustField = IsFunc ? NonVirtualBaseAdjustment : FirstField;
+ bool isDerivedToBase = (E->getCastKind() == CK_DerivedToBaseMemberPointer);
+ if (!NVAdjustField) // If this field didn't exist in src, it's zero.
+ NVAdjustField = getZeroInt();
+ if (isDerivedToBase)
+ NVAdjustField = Builder.CreateNSWSub(NVAdjustField, Adj, "adj");
+ else
+ NVAdjustField = Builder.CreateNSWAdd(NVAdjustField, Adj, "adj");
+ }
+
+ // FIXME PR15713: Support conversions through virtually derived classes.
+
+ // Recompose dst from the null struct and the adjusted fields from src.
+ llvm::Value *Dst;
+ if (hasOnlyOneField(IsFunc, DstInheritance)) {
+ Dst = FirstField;
+ } else {
+ Dst = llvm::UndefValue::get(DstNull->getType());
+ unsigned Idx = 0;
+ Dst = Builder.CreateInsertValue(Dst, FirstField, Idx++);
+ if (hasNonVirtualBaseAdjustmentField(IsFunc, DstInheritance))
+ Dst = Builder.CreateInsertValue(
+ Dst, getValueOrZeroInt(NonVirtualBaseAdjustment), Idx++);
+ if (hasVBPtrOffsetField(DstInheritance))
+ Dst = Builder.CreateInsertValue(
+ Dst, getValueOrZeroInt(VBPtrOffset), Idx++);
+ if (hasVirtualBaseAdjustmentField(DstInheritance))
+ Dst = Builder.CreateInsertValue(
+ Dst, getValueOrZeroInt(VirtualBaseAdjustmentOffset), Idx++);
+ }
+ Builder.CreateBr(ContinueBB);
+
+ // In the continuation, choose between DstNull and Dst.
+ CGF.EmitBlock(ContinueBB);
+ llvm::PHINode *Phi = Builder.CreatePHI(DstNull->getType(), 2, "memptr.converted");
+ Phi->addIncoming(DstNull, OriginalBB);
+ Phi->addIncoming(Dst, ConvertBB);
+ return Phi;
+}
+
+llvm::Constant *
+MicrosoftCXXABI::EmitMemberPointerConversion(const CastExpr *E,
+ llvm::Constant *Src) {
+ const MemberPointerType *SrcTy =
+ E->getSubExpr()->getType()->castAs<MemberPointerType>();
+ const MemberPointerType *DstTy = E->getType()->castAs<MemberPointerType>();
+
+ // If src is null, emit a new null for dst. We can't return src because dst
+ // might have a new representation.
+ if (MemberPointerConstantIsNull(SrcTy, Src))
+ return EmitNullMemberPointer(DstTy);
+
+ // We don't need to do anything for reinterpret_casts of non-null member
+ // pointers. We should only get here when the two type representations have
+ // the same size.
+ if (E->getCastKind() == CK_ReinterpretMemberPointer)
+ return Src;
+
+ MSInheritanceModel SrcInheritance = getInheritanceFromMemptr(SrcTy);
+ MSInheritanceModel DstInheritance = getInheritanceFromMemptr(DstTy);
+
+ // Decompose src.
+ llvm::Constant *FirstField = Src;
+ llvm::Constant *NonVirtualBaseAdjustment = 0;
+ llvm::Constant *VirtualBaseAdjustmentOffset = 0;
+ llvm::Constant *VBPtrOffset = 0;
+ bool IsFunc = SrcTy->isMemberFunctionPointer();
+ if (!hasOnlyOneField(IsFunc, SrcInheritance)) {
+ // We need to extract values.
+ unsigned I = 0;
+ FirstField = Src->getAggregateElement(I++);
+ if (hasNonVirtualBaseAdjustmentField(IsFunc, SrcInheritance))
+ NonVirtualBaseAdjustment = Src->getAggregateElement(I++);
+ if (hasVBPtrOffsetField(SrcInheritance))
+ VBPtrOffset = Src->getAggregateElement(I++);
+ if (hasVirtualBaseAdjustmentField(SrcInheritance))
+ VirtualBaseAdjustmentOffset = Src->getAggregateElement(I++);
+ }
+
+ // For data pointers, we adjust the field offset directly. For functions, we
+ // have a separate field.
+ llvm::Constant *Adj = getMemberPointerAdjustment(E);
+ if (Adj) {
+ Adj = llvm::ConstantExpr::getTruncOrBitCast(Adj, CGM.IntTy);
+ llvm::Constant *&NVAdjustField =
+ IsFunc ? NonVirtualBaseAdjustment : FirstField;
+ bool IsDerivedToBase = (E->getCastKind() == CK_DerivedToBaseMemberPointer);
+ if (!NVAdjustField) // If this field didn't exist in src, it's zero.
+ NVAdjustField = getZeroInt();
+ if (IsDerivedToBase)
+ NVAdjustField = llvm::ConstantExpr::getNSWSub(NVAdjustField, Adj);
+ else
+ NVAdjustField = llvm::ConstantExpr::getNSWAdd(NVAdjustField, Adj);
+ }
+
+ // FIXME PR15713: Support conversions through virtually derived classes.
+
+ // Recompose dst from the null struct and the adjusted fields from src.
+ if (hasOnlyOneField(IsFunc, DstInheritance))
+ return FirstField;
+
+ llvm::SmallVector<llvm::Constant *, 4> Fields;
+ Fields.push_back(FirstField);
+ if (hasNonVirtualBaseAdjustmentField(IsFunc, DstInheritance))
+ Fields.push_back(getConstantOrZeroInt(NonVirtualBaseAdjustment));
+ if (hasVBPtrOffsetField(DstInheritance))
+ Fields.push_back(getConstantOrZeroInt(VBPtrOffset));
+ if (hasVirtualBaseAdjustmentField(DstInheritance))
+ Fields.push_back(getConstantOrZeroInt(VirtualBaseAdjustmentOffset));
+ return llvm::ConstantStruct::getAnon(Fields);
+}
+
llvm::Value *
MicrosoftCXXABI::EmitLoadOfMemberFunctionPointer(CodeGenFunction &CGF,
llvm::Value *&This,
@@ -855,4 +1939,3 @@ MicrosoftCXXABI::EmitLoadOfMemberFunctionPointer(CodeGenFunction &CGF,
CGCXXABI *clang::CodeGen::CreateMicrosoftCXXABI(CodeGenModule &CGM) {
return new MicrosoftCXXABI(CGM);
}
-
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