maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

Teach AggExprEmitter about pointers to member functions. 

llvm-svn: 83266
This commit is contained in:
Anders Carlsson 2009-10-03 15:43:24 +00:00
parent 3162e4945a
commit c46bf276e1
2 changed files with 48 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

33
clang/lib/CodeGen/CGExprAgg.cpp
View File

@ -94,6 +94,7 @@ public:
void VisitBinaryOperator(const BinaryOperator *BO);
void VisitBinAssign(const BinaryOperator *E);
void VisitBinComma(const BinaryOperator *E);
void VisitUnaryAddrOf(const UnaryOperator *E);
void VisitObjCMessageExpr(ObjCMessageExpr *E);
void VisitObjCIvarRefExpr(ObjCIvarRefExpr *E) {
@ -281,6 +282,38 @@ void AggExprEmitter::VisitBinComma(const BinaryOperator *E) {
/*IgnoreResult=*/false, IsInitializer);
}
void AggExprEmitter::VisitUnaryAddrOf(const UnaryOperator *E) {
// We have a member function pointer.
const MemberPointerType *MPT = E->getType()->getAs<MemberPointerType>();
assert(MPT->getPointeeType()->isFunctionProtoType() &&
"Unexpected member pointer type!");
const QualifiedDeclRefExpr *DRE = cast<QualifiedDeclRefExpr>(E->getSubExpr());
const CXXMethodDecl *MD = cast<CXXMethodDecl>(DRE->getDecl());
const llvm::Type *PtrDiffTy =
CGF.ConvertType(CGF.getContext().getPointerDiffType());
llvm::Value *DstPtr = Builder.CreateStructGEP(DestPtr, 0, "dst.ptr");
llvm::Value *FuncPtr;
if (MD->isVirtual()) {
uint64_t Index = CGF.CGM.GetVtableIndex(MD);
FuncPtr = llvm::ConstantInt::get(PtrDiffTy, Index + 1);
} else {
FuncPtr = llvm::ConstantExpr::getPtrToInt(CGF.CGM.GetAddrOfFunction(MD),
PtrDiffTy);
}
Builder.CreateStore(FuncPtr, DstPtr, VolatileDest);
llvm::Value *AdjPtr = Builder.CreateStructGEP(DestPtr, 1, "dst.adj");
// The adjustment will always be 0.
Builder.CreateStore(llvm::ConstantInt::get(PtrDiffTy, 0), AdjPtr,
VolatileDest);
}
void AggExprEmitter::VisitStmtExpr(const StmtExpr *E) {
CGF.EmitCompoundStmt(*E->getSubStmt(), true, DestPtr, VolatileDest);
}

16
clang/test/CodeGenCXX/member-function-pointers.cpp
View File

@ -31,7 +31,21 @@ void f() {
vpa = 0;
// CHECK: store i64 %0, i64* getelementptr inbounds (%0* @pc, i32 0, i32 0)
// CHECK: [[ADJ:%[a-zA-Z0-9]+]] = add i64 %1, 16
// CHECK: [[ADJ:%[a-zA-Z0-9\.]+]] = add i64 %1, 16
// CHECK: store i64 [[ADJ]], i64* getelementptr inbounds (%0* @pc, i32 0, i32 1)
pc = pa;
}
void f2() {
// CHECK: [[pa2ptr:%[a-zA-Z0-9\.]+]] = getelementptr inbounds %0* %pa2, i32 0, i32 0
// CHECK: store i64 ptrtoint (void ()* @_ZN1A1fEv to i64), i64* [[pa2ptr]]
// CHECK: [[pa2adj:%[a-zA-Z0-9\.]+]] = getelementptr inbounds %0* %pa2, i32 0, i32 1
// CHECK: store i64 0, i64* [[pa2adj]]
void (A::*pa2)() = &A::f;
// CHECK: [[pa3ptr:%[a-zA-Z0-9\.]+]] = getelementptr inbounds %0* %pa3, i32 0, i32 0
// CHECK: store i64 1, i64* [[pa3ptr]]
// CHECK: [[pa3adj:%[a-zA-Z0-9\.]+]] = getelementptr inbounds %0* %pa3, i32 0, i32 1
// CHECK: store i64 0, i64* [[pa2adj]]
void (A::*pa3)() = &A::vf;
}