MS ABI: Implement support for throwing a C++ exception
Throwing a C++ exception, under the MS ABI, is implemented using three
components:
- ThrowInfo structure which contains information like CV qualifiers,
what destructor to call and a pointer to the CatchableTypeArray.
- In a significant departure from the Itanium ABI, copying by-value
occurs in the runtime and not at the catch site. This means we need
to enumerate all possible types that this exception could be caught as
and encode the necessary information to convert from the exception
object's type to the catch handler's type. This includes complicated
derived to base conversions and the execution of copy-constructors.
N.B. This implementation doesn't support the execution of a
copy-constructor from within the runtime for now. Adding support for
that functionality is quite difficult due to things like default
argument expressions which may evaluate arbitrary code hiding in the
copy-constructor's parameters.
Differential Revision: http://reviews.llvm.org/D8066
llvm-svn: 231328
diff --git a/clang/lib/CodeGen/ItaniumCXXABI.cpp b/clang/lib/CodeGen/ItaniumCXXABI.cpp
index 2dffec5..93407d9 100644
--- a/clang/lib/CodeGen/ItaniumCXXABI.cpp
+++ b/clang/lib/CodeGen/ItaniumCXXABI.cpp
@@ -115,6 +115,7 @@
const CXXDestructorDecl *Dtor) override;
void emitRethrow(CodeGenFunction &CGF, bool isNoReturn) override;
+ void emitThrow(CodeGenFunction &CGF, const CXXThrowExpr *E) override;
void emitBeginCatch(CodeGenFunction &CGF, const CXXCatchStmt *C) override;
@@ -916,6 +917,59 @@
CGF.EmitRuntimeCallOrInvoke(Fn);
}
+static llvm::Constant *getAllocateExceptionFn(CodeGenModule &CGM) {
+ // void *__cxa_allocate_exception(size_t thrown_size);
+
+ llvm::FunctionType *FTy =
+ llvm::FunctionType::get(CGM.Int8PtrTy, CGM.SizeTy, /*IsVarArgs=*/false);
+
+ return CGM.CreateRuntimeFunction(FTy, "__cxa_allocate_exception");
+}
+
+static llvm::Constant *getThrowFn(CodeGenModule &CGM) {
+ // void __cxa_throw(void *thrown_exception, std::type_info *tinfo,
+ // void (*dest) (void *));
+
+ llvm::Type *Args[3] = { CGM.Int8PtrTy, CGM.Int8PtrTy, CGM.Int8PtrTy };
+ llvm::FunctionType *FTy =
+ llvm::FunctionType::get(CGM.VoidTy, Args, /*IsVarArgs=*/false);
+
+ return CGM.CreateRuntimeFunction(FTy, "__cxa_throw");
+}
+
+void ItaniumCXXABI::emitThrow(CodeGenFunction &CGF, const CXXThrowExpr *E) {
+ QualType ThrowType = E->getSubExpr()->getType();
+ // Now allocate the exception object.
+ llvm::Type *SizeTy = CGF.ConvertType(getContext().getSizeType());
+ uint64_t TypeSize = getContext().getTypeSizeInChars(ThrowType).getQuantity();
+
+ llvm::Constant *AllocExceptionFn = getAllocateExceptionFn(CGM);
+ llvm::CallInst *ExceptionPtr = CGF.EmitNounwindRuntimeCall(
+ AllocExceptionFn, llvm::ConstantInt::get(SizeTy, TypeSize), "exception");
+
+ CGF.EmitAnyExprToExn(E->getSubExpr(), ExceptionPtr);
+
+ // Now throw the exception.
+ llvm::Constant *TypeInfo = CGM.GetAddrOfRTTIDescriptor(ThrowType,
+ /*ForEH=*/true);
+
+ // The address of the destructor. If the exception type has a
+ // trivial destructor (or isn't a record), we just pass null.
+ llvm::Constant *Dtor = nullptr;
+ if (const RecordType *RecordTy = ThrowType->getAs<RecordType>()) {
+ CXXRecordDecl *Record = cast<CXXRecordDecl>(RecordTy->getDecl());
+ if (!Record->hasTrivialDestructor()) {
+ CXXDestructorDecl *DtorD = Record->getDestructor();
+ Dtor = CGM.getAddrOfCXXStructor(DtorD, StructorType::Complete);
+ Dtor = llvm::ConstantExpr::getBitCast(Dtor, CGM.Int8PtrTy);
+ }
+ }
+ if (!Dtor) Dtor = llvm::Constant::getNullValue(CGM.Int8PtrTy);
+
+ llvm::Value *args[] = { ExceptionPtr, TypeInfo, Dtor };
+ CGF.EmitNoreturnRuntimeCallOrInvoke(getThrowFn(CGM), args);
+}
+
static llvm::Constant *getItaniumDynamicCastFn(CodeGenFunction &CGF) {
// void *__dynamic_cast(const void *sub,
// const abi::__class_type_info *src,