From 65687600908a23fc510600d6bec06238fd2cc9d5 Mon Sep 17 00:00:00 2001 From: David Majnemer Date: Sun, 27 Mar 2016 04:46:14 +0000 Subject: [PATCH] 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 --- clang/lib/CodeGen/CodeGenModule.cpp | 4 ++-- clang/test/CodeGenCXX/microsoft-uuidof.cpp | 2 ++ 2 files changed, 4 insertions(+), 2 deletions(-) diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp index 399b739..435d646 100644 --- a/clang/lib/CodeGen/CodeGenModule.cpp +++ b/clang/lib/CodeGen/CodeGenModule.cpp @@ -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)) diff --git a/clang/test/CodeGenCXX/microsoft-uuidof.cpp b/clang/test/CodeGenCXX/microsoft-uuidof.cpp index 2ac5f1b..62e4b88 100644 --- a/clang/test/CodeGenCXX/microsoft-uuidof.cpp +++ b/clang/test/CodeGenCXX/microsoft-uuidof.cpp @@ -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 -- 2.7.4