mirror of
https://github.com/llvm/llvm-project.git
synced 2025-04-26 06:16:06 +00:00
1a711b1696
Summary: This pragma is very rare. We could *hypothetically* lower some uses of it down to @llvm.global_ctors, but given that GlobalOpt isn't able to optimize prioritized global ctors today, there's really no point. If we wanted to do this in the future, I would check if the section used in the pragma started with ".CRT$XC" and had up to two characters after it. Those two characters could form the 16-bit initialization priority that we support in @llvm.global_ctors. We would have to teach LLVM to lower prioritized global ctors on COFF as well. This should let us compile some silly uses of this pragma in WebKit / Blink. Reviewers: rsmith, majnemer Subscribers: cfe-commits Differential Revision: http://reviews.llvm.org/D4549 llvm-svn: 213593
73 lines
3.3 KiB
C++
73 lines
3.3 KiB
C++
// RUN: %clang_cc1 %s -triple=i686-pc-win32 -fms-extensions -emit-llvm -o - | FileCheck %s
|
|
|
|
int f();
|
|
|
|
// CHECK: $"\01?x@selectany_init@@3HA" = comdat any
|
|
// CHECK: $"\01?x@?$A@H@explicit_template_instantiation@@2HB" = comdat any
|
|
// CHECK: $"\01?x@?$A@H@implicit_template_instantiation@@2HB" = comdat any
|
|
|
|
namespace simple_init {
|
|
#pragma init_seg(compiler)
|
|
int x = f();
|
|
// CHECK: @"\01?x@simple_init@@3HA" = global i32 0, align 4
|
|
// CHECK: @__cxx_init_fn_ptr = private constant void ()* @"\01??__Ex@simple_init@@YAXXZ", section ".CRT$XCC"
|
|
|
|
#pragma init_seg(lib)
|
|
int y = f();
|
|
// CHECK: @"\01?y@simple_init@@3HA" = global i32 0, align 4
|
|
// CHECK: @__cxx_init_fn_ptr1 = private constant void ()* @"\01??__Ey@simple_init@@YAXXZ", section ".CRT$XCL"
|
|
|
|
#pragma init_seg(user)
|
|
int z = f();
|
|
// CHECK: @"\01?z@simple_init@@3HA" = global i32 0, align 4
|
|
// No function pointer! This one goes on @llvm.global_ctors.
|
|
}
|
|
|
|
#pragma init_seg(".asdf")
|
|
|
|
namespace internal_init {
|
|
namespace {
|
|
int x = f();
|
|
// CHECK: @"\01?x@?A@internal_init@@3HA" = internal global i32 0, align 4
|
|
// CHECK: @__cxx_init_fn_ptr2 = private constant void ()* @"\01??__Ex@?A@internal_init@@YAXXZ", section ".asdf"
|
|
}
|
|
}
|
|
|
|
namespace selectany_init {
|
|
int __declspec(selectany) x = f();
|
|
// CHECK: @"\01?x@selectany_init@@3HA" = weak_odr global i32 0, comdat $"\01?x@selectany_init@@3HA", align 4
|
|
// CHECK: @__cxx_init_fn_ptr3 = private constant void ()* @"\01??__Ex@selectany_init@@YAXXZ", section ".asdf", comdat $"\01?x@selectany_init@@3HA"
|
|
}
|
|
|
|
namespace explicit_template_instantiation {
|
|
template <typename T> struct A { static const int x; };
|
|
template <typename T> const int A<T>::x = f();
|
|
template struct A<int>;
|
|
// CHECK: @"\01?x@?$A@H@explicit_template_instantiation@@2HB" = weak_odr global i32 0, comdat $"\01?x@?$A@H@explicit_template_instantiation@@2HB", align 4
|
|
// CHECK: @__cxx_init_fn_ptr4 = private constant void ()* @"\01??__Ex@?$A@H@explicit_template_instantiation@@2HB@YAXXZ", section ".asdf", comdat $"\01?x@?$A@H@explicit_template_instantiation@@2HB"
|
|
}
|
|
|
|
namespace implicit_template_instantiation {
|
|
template <typename T> struct A { static const int x; };
|
|
template <typename T> const int A<T>::x = f();
|
|
int g() { return A<int>::x; }
|
|
// CHECK: @"\01?x@?$A@H@implicit_template_instantiation@@2HB" = linkonce_odr global i32 0, comdat $"\01?x@?$A@H@implicit_template_instantiation@@2HB", align 4
|
|
// CHECK: @__cxx_init_fn_ptr5 = private constant void ()* @"\01??__Ex@?$A@H@implicit_template_instantiation@@2HB@YAXXZ", section ".asdf", comdat $"\01?x@?$A@H@implicit_template_instantiation@@2HB"
|
|
}
|
|
|
|
// ... and here's where we emitted user level ctors.
|
|
// CHECK: @llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }]
|
|
// CHECK: [{ i32, void ()*, i8* } { i32 65535, void ()* @_GLOBAL__sub_I_pragma_init_seg.cpp, i8* null }]
|
|
|
|
// We have to mark everything used so we can survive globalopt, even through
|
|
// LTO. There's no way LLVM could really understand if data in the .asdf
|
|
// section is really used or dead.
|
|
//
|
|
// CHECK: @llvm.used = appending global [6 x i8*]
|
|
// CHECK: [i8* bitcast (void ()** @__cxx_init_fn_ptr to i8*),
|
|
// CHECK: i8* bitcast (void ()** @__cxx_init_fn_ptr1 to i8*),
|
|
// CHECK: i8* bitcast (void ()** @__cxx_init_fn_ptr2 to i8*),
|
|
// CHECK: i8* bitcast (void ()** @__cxx_init_fn_ptr3 to i8*),
|
|
// CHECK: i8* bitcast (void ()** @__cxx_init_fn_ptr4 to i8*),
|
|
// CHECK: i8* bitcast (void ()** @__cxx_init_fn_ptr5 to i8*)], section "llvm.metadata"
|