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[MS ABI] Don't crash on references to pointers to members in args 

We know that a reference can always be dereferenced.  However, we don't
always know the number of bytes if the reference's pointee type is
incomplete.  This case was correctly handled but we didn't consider the
case where the type is complete but we cannot calculate its size for ABI
specific reasons.  In this specific case, a member pointer's size is
available only under certain conditions.

This fixes PR24703.

llvm-svn: 247188
This commit is contained in:
David Majnemer 2015-09-09 20:57:59 +00:00
parent 5e0668426c
commit 22ee1a7466
2 changed files with 8 additions and 2 deletions
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4
clang/lib/CodeGen/CGCall.cpp
View File

@ -1586,7 +1586,7 @@ void CodeGenModule::ConstructAttributeList(const CGFunctionInfo &FI,
if (const auto *RefTy = RetTy->getAs<ReferenceType>()) {
QualType PTy = RefTy->getPointeeType();
if (!PTy->isIncompleteType() && PTy->isConstantSizeType())
if (getCXXABI().isTypeInfoCalculable(PTy) && PTy->isConstantSizeType())
RetAttrs.addDereferenceableAttr(getContext().getTypeSizeInChars(PTy)
.getQuantity());
else if (getContext().getTargetAddressSpace(PTy) == 0)
@ -1698,7 +1698,7 @@ void CodeGenModule::ConstructAttributeList(const CGFunctionInfo &FI,
if (const auto *RefTy = ParamType->getAs<ReferenceType>()) {
QualType PTy = RefTy->getPointeeType();
if (!PTy->isIncompleteType() && PTy->isConstantSizeType())
if (getCXXABI().isTypeInfoCalculable(PTy) && PTy->isConstantSizeType())
Attrs.addDereferenceableAttr(getContext().getTypeSizeInChars(PTy)
.getQuantity());
else if (getContext().getTargetAddressSpace(PTy) == 0)

6
clang/test/CodeGenCXX/microsoft-abi-member-pointers.cpp
View File

@ -745,4 +745,10 @@ void foo_fun() {
// CHECK: store i8* bitcast (void (%class.CA*)* @"\01?OnHelp@CA@@QAEXXZ" to i8*), i8**
f func = (f)&CA::OnHelp;
}
namespace PR24703 {
struct S;
void f(int S::*&p) {}
// CHECK-LABEL: define void @"\01?f@PR24703@@YAXAAPQS@1@H@Z"(
}