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llvm-project/clang/test/CodeGen/ms-declspecs.c

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Turned on support for __declspecs: noreturn, noinline, nothrow and naked in MS compatibility mode. llvm-svn: 151295
2012-02-24 06:46:33 +08:00
// RUN: %clang_cc1 -triple i386-pc-win32 %s -emit-llvm -fms-compatibility -o - | FileCheck %s
Implement __declspec(selectany) under -fms-extensions selectany only applies to externally visible global variables. It has the effect of making the data weak_odr. The MSDN docs suggest that unused definitions can only be dropped at linktime, so Clang uses weak instead of linkonce. MSVC optimizes away references to constant selectany data, so it must assume that there is only one definition, hence weak_odr. Reviewers: espindola Differential Revision: http://llvm-reviews.chandlerc.com/D814 llvm-svn: 182266
2013-05-20 22:02:37 +08:00
__declspec(selectany) int x1 = 1;
const __declspec(selectany) int x2 = 2;
[patch][pr19848] Produce explicit comdats in clang. The llvm IR until recently had no support for comdats. This was a problem when targeting C++ on ELF/COFF as just using weak linkage would cause quite a bit of dead bits to remain on the executable (unless -ffunction-sections, -fdata-sections and --gc-sections were used). To fix the problem, llvm's codegen will just assume that any weak or linkonce that is not in an explicit comdat should be output in one with the same name as the global. This unfortunately breaks cases like pr19848 where a weak symbol is not xpected to be part of any comdat. Now that we have explicit comdats in the IR, we can finally get both cases right. This first patch just makes clang give explicit comdats to GlobalValues where t is allowed to. A followup patch to llvm will then stop implicitly producing comdats. llvm-svn: 225705
2015-01-13 06:13:53 +08:00
// CHECK: @x1 = weak_odr global i32 1, comdat, align 4
// CHECK: @x2 = weak_odr constant i32 2, comdat, align 4
Implement __declspec(selectany) under -fms-extensions selectany only applies to externally visible global variables. It has the effect of making the data weak_odr. The MSDN docs suggest that unused definitions can only be dropped at linktime, so Clang uses weak instead of linkonce. MSVC optimizes away references to constant selectany data, so it must assume that there is only one definition, hence weak_odr. Reviewers: espindola Differential Revision: http://llvm-reviews.chandlerc.com/D814 llvm-svn: 182266
2013-05-20 22:02:37 +08:00
Make __declspec(selectany) turn variable declartions into definitions. Fixes PR23242. llvm-svn: 235046
2015-04-16 05:50:06 +08:00
// selectany turns extern variable declarations into definitions.
Don't crash when a selectany symbol would get common linkage Things can't both be in comdats and have common linkage, so never give things in comdats common linkage. Common linkage is only used in .c files, and the only thing that can trigger a comdat in c is selectany from what I can tell. Fixes PR23243. Also address an over-the-shoulder review comment from rnk by moving the hasAttr<SelectAnyAttr>() in Decl.cpp around a bit. It only makes a minor difference for selectany on global variables, so it goes well with the rest of this patch. http://reviews.llvm.org/D9042 llvm-svn: 235053
2015-04-16 07:04:24 +08:00
__declspec(selectany) int x3;
extern __declspec(selectany) int x4;
Make __declspec(selectany) turn variable declartions into definitions. Fixes PR23242. llvm-svn: 235046
2015-04-16 05:50:06 +08:00
// CHECK: @x3 = weak_odr global i32 0, comdat, align 4
Don't crash when a selectany symbol would get common linkage Things can't both be in comdats and have common linkage, so never give things in comdats common linkage. Common linkage is only used in .c files, and the only thing that can trigger a comdat in c is selectany from what I can tell. Fixes PR23243. Also address an over-the-shoulder review comment from rnk by moving the hasAttr<SelectAnyAttr>() in Decl.cpp around a bit. It only makes a minor difference for selectany on global variables, so it goes well with the rest of this patch. http://reviews.llvm.org/D9042 llvm-svn: 235053
2015-04-16 07:04:24 +08:00
// CHECK: @x4 = weak_odr global i32 0, comdat, align 4
Make __declspec(selectany) turn variable declartions into definitions. Fixes PR23242. llvm-svn: 235046
2015-04-16 05:50:06 +08:00
Reapplying the changes from r158717 as they were rolled back to avoid merge conflicts from a separate problematic patch. llvm-svn: 158750
2012-06-20 06:09:27 +08:00
struct __declspec(align(16)) S {
char x;
};
union { struct S s; } u;
// CHECK: @u = {{.*}}zeroinitializer, align 16
Fix testcases to not rely upon target-* attributes. llvm-svn: 176135
2013-02-27 07:08:48 +08:00
// CHECK: define void @t3() [[NAKED:#[0-9]+]] {
Turned on support for __declspecs: noreturn, noinline, nothrow and naked in MS compatibility mode. llvm-svn: 151295
2012-02-24 06:46:33 +08:00
__declspec(naked) void t3() {}
Fix testcases to not rely upon target-* attributes. llvm-svn: 176135
2013-02-27 07:08:48 +08:00
// CHECK: define void @t22() [[NUW:#[0-9]+]]
Turned on support for __declspecs: noreturn, noinline, nothrow and naked in MS compatibility mode. llvm-svn: 151295
2012-02-24 06:46:33 +08:00
void __declspec(nothrow) t22();
void t22() {}
Fix testcases to not rely upon target-* attributes. llvm-svn: 176135
2013-02-27 07:08:48 +08:00
// CHECK: define void @t2() [[NI:#[0-9]+]] {
Turned on support for __declspecs: noreturn, noinline, nothrow and naked in MS compatibility mode. llvm-svn: 151295
2012-02-24 06:46:33 +08:00
__declspec(noinline) void t2() {}
Update to use references to attribute groups instead of listing the attributes on the call/invoke instructions. llvm-svn: 175878
2013-02-22 17:10:20 +08:00
// CHECK: call void @f20_t() [[NR:#[0-9]+]]
Turned on support for __declspecs: noreturn, noinline, nothrow and naked in MS compatibility mode. llvm-svn: 151295
2012-02-24 06:46:33 +08:00
__declspec(noreturn) void f20_t(void);
void f20(void) { f20_t(); }
Modify the tests to use attribute group references instead of listing the function attributes. llvm-svn: 175606
2013-02-20 15:22:19 +08:00
[MS Compat] Add support for __declspec(noalias) The attribute '__declspec(noalias)' communicates that the function only accesses memory pointed to by its pointer-typed arguments. llvm-svn: 242728
2015-07-21 06:51:52 +08:00
__declspec(noalias) void noalias_callee(int *x);
// CHECK: call void @noalias_callee({{.*}}) [[NA:#[0-9]+]]
void noalias_caller(int *x) { noalias_callee(x); }
Fix testcases to not rely upon target-* attributes. llvm-svn: 176135
2013-02-27 07:08:48 +08:00
// CHECK: attributes [[NAKED]] = { naked noinline nounwind{{.*}} }
// CHECK: attributes [[NUW]] = { nounwind{{.*}} }
// CHECK: attributes [[NI]] = { noinline nounwind{{.*}} }
Update tests so that we don't test for function-only attributes on call sites. llvm-svn: 175921
2013-02-23 05:12:51 +08:00
// CHECK: attributes [[NR]] = { noreturn }
[MS Compat] Add support for __declspec(noalias) The attribute '__declspec(noalias)' communicates that the function only accesses memory pointed to by its pointer-typed arguments. llvm-svn: 242728
2015-07-21 06:51:52 +08:00
// CHECK: attributes [[NA]] = { nounwind argmemonly{{.*}} }