From 1ce308866915c9eab78486066d28d2107b7fede2 Mon Sep 17 00:00:00 2001 From: Reid Kleckner Date: Fri, 16 May 2014 20:39:27 +0000 Subject: Add comdat key field to llvm.global_ctors and llvm.global_dtors This allows us to put dynamic initializers for weak data into the same comdat group as the data being initialized. This is necessary for MSVC ABI compatibility. Once we have comdats for guard variables, we can use the combination to help GlobalOpt fire more often for weak data with guarded initialization on other platforms. Reviewers: nlewycky Differential Revision: http://reviews.llvm.org/D3499 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209015 91177308-0d34-0410-b5e6-96231b3b80d8 --- test/Linker/global_ctors.ll | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 test/Linker/global_ctors.ll (limited to 'test/Linker/global_ctors.ll') diff --git a/test/Linker/global_ctors.ll b/test/Linker/global_ctors.ll new file mode 100644 index 00000000000..541f0d4f91b --- /dev/null +++ b/test/Linker/global_ctors.ll @@ -0,0 +1,29 @@ +; RUN: llvm-as %s -o %t.new.bc +; RUN: llvm-link %t.new.bc %S/Inputs/old_global_ctors.3.4.bc | llvm-dis | FileCheck %s + +; old_global_ctors.3.4.bc contains the following LLVM IL, assembled into +; bitcode by llvm-as from 3.4. It uses a two element @llvm.global_ctors array. +; --- +; declare void @a_global_ctor() +; declare void @b_global_ctor() +; +; @llvm.global_ctors = appending global [2 x { i32, void ()* } ] [ +; { i32, void ()* } { i32 65535, void ()* @a_global_ctor }, +; { i32, void ()* } { i32 65535, void ()* @b_global_ctor } +; ] +; --- + +declare void @c_global_ctor() +declare void @d_global_ctor() + +@llvm.global_ctors = appending global [2 x { i32, void ()*, i8* } ] [ + { i32, void ()*, i8* } { i32 65535, void ()* @c_global_ctor, i8* null }, + { i32, void ()*, i8* } { i32 65535, void ()* @d_global_ctor, i8* null } +] + +; CHECK: @llvm.global_ctors = appending global [4 x { i32, void ()*, i8* }] [ +; CHECK-DAG: { i32, void ()*, i8* } { i32 65535, void ()* @a_global_ctor, i8* null } +; CHECK-DAG: { i32, void ()*, i8* } { i32 65535, void ()* @b_global_ctor, i8* null } +; CHECK-DAG: { i32, void ()*, i8* } { i32 65535, void ()* @c_global_ctor, i8* null } +; CHECK-DAG: { i32, void ()*, i8* } { i32 65535, void ()* @d_global_ctor, i8* null } +; CHECK: ] -- cgit v1.2.3