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Use the correct alignment for uuid descriptors 

The _GUID_ descriptors emitted by MSVC have alignment 8 for 64-bit
builds: we should do the same if the linker picks the "wrong" COMDAT.

llvm-svn: 264530
This commit is contained in:
David Majnemer 2016-03-27 04:46:14 +00:00
parent 1dbc7a7a5a
commit 6568760090
2 changed files with 4 additions and 2 deletions
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4
clang/lib/CodeGen/CodeGenModule.cpp
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@ -1458,8 +1458,8 @@ ConstantAddress CodeGenModule::GetAddrOfUuidDescriptor(
std::string Name = "_GUID_" + Uuid.lower();
std::replace(Name.begin(), Name.end(), '-', '_');
// Contains a 32-bit field.
CharUnits Alignment = CharUnits::fromQuantity(4);
// The UUID descriptor should be pointer aligned.
CharUnits Alignment = CharUnits::fromQuantity(PointerAlignInBytes);
// Look for an existing global.
if (llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name))

2
clang/test/CodeGenCXX/microsoft-uuidof.cpp
View File

@ -1,5 +1,6 @@
// RUN: %clang_cc1 -emit-llvm %s -o - -DDEFINE_GUID -triple=i386-pc-linux -fms-extensions | FileCheck %s --check-prefix=CHECK-DEFINE-GUID
// RUN: %clang_cc1 -emit-llvm %s -o - -triple=i386-pc-linux -fms-extensions | FileCheck %s
// RUN: %clang_cc1 -emit-llvm %s -o - -triple=x86_64-pc-linux -fms-extensions | FileCheck %s --check-prefix=CHECK-64
// RUN: %clang_cc1 -emit-llvm %s -o - -DDEFINE_GUID -DWRONG_GUID -triple=i386-pc-linux -fms-extensions | FileCheck %s --check-prefix=CHECK-DEFINE-WRONG-GUID
#ifdef DEFINE_GUID
@ -36,6 +37,7 @@ GUID g = __uuidof(S1);
// First global use of __uuidof(S1) forces the creation of the global.
// CHECK: @_GUID_12345678_1234_1234_1234_1234567890ab = linkonce_odr constant { i32, i16, i16, [8 x i8] } { i32 305419896, i16 4660, i16 4660, [8 x i8] c"\124\124Vx\90\AB" }, comdat
// CHECK: @gr = constant %struct._GUID* bitcast ({ i32, i16, i16, [8 x i8] }* @_GUID_12345678_1234_1234_1234_1234567890ab to %struct._GUID*), align 4
// CHECK-64: @gr = constant %struct._GUID* bitcast ({ i32, i16, i16, [8 x i8] }* @_GUID_12345678_1234_1234_1234_1234567890ab to %struct._GUID*), align 8
const GUID& gr = __uuidof(S1);
// CHECK: @gp = global %struct._GUID* bitcast ({ i32, i16, i16, [8 x i8] }* @_GUID_12345678_1234_1234_1234_1234567890ab to %struct._GUID*), align 4