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Add comdat key field to llvm.global_ctors and llvm.global_dtors

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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
This commit is contained in:
Reid Kleckner
2014-05-16 20:39:27 +00:00
parent dedd6203ad
commit 1ce3088669
16 changed files with 289 additions and 69 deletions
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20
test/MC/COFF/global_ctors_dtors.ll
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@@ -9,8 +9,13 @@
@.str2 = private unnamed_addr constant [12 x i8] c"destructing\00", align 1
@.str3 = private unnamed_addr constant [5 x i8] c"main\00", align 1
@llvm.global_ctors = appending global [1 x { i32, void ()* }] [{ i32, void ()* } { i32 65535, void ()* @a_global_ctor }]
@llvm.global_dtors = appending global [1 x { i32, void ()* }] [{ i32, void ()* } { i32 65535, void ()* @a_global_dtor }]
%ini = type { i32, void()*, i8* }
@llvm.global_ctors = appending global [2 x %ini ] [
%ini { i32 65535, void ()* @a_global_ctor, i8* null },
%ini { i32 65535, void ()* @b_global_ctor, i8* bitcast (i32* @b to i8*) }
]
@llvm.global_dtors = appending global [1 x %ini ] [%ini { i32 65535, void ()* @a_global_dtor, i8* null }]
declare i32 @puts(i8*)
@@ -19,6 +24,13 @@ define void @a_global_ctor() nounwind {
ret void
}
@b = global i32 zeroinitializer
define void @b_global_ctor() nounwind {
store i32 42, i32* @b
ret void
}
define void @a_global_dtor() nounwind {
%1 = call i32 @puts(i8* getelementptr inbounds ([12 x i8]* @.str2, i32 0, i32 0))
ret void
@@ -31,9 +43,13 @@ define i32 @main() nounwind {
; WIN32: .section .CRT$XCU,"rd"
; WIN32: a_global_ctor
; WIN32: .section .CRT$XCU,"rd",associative .bss,{{_?}}b
; WIN32: b_global_ctor
; WIN32: .section .CRT$XTX,"rd"
; WIN32: a_global_dtor
; MINGW32: .section .ctors,"wd"
; MINGW32: a_global_ctor
; MINGW32: .section .ctors,"wd",associative .bss,{{_?}}b
; MINGW32: b_global_ctor
; MINGW32: .section .dtors,"wd"
; MINGW32: a_global_dtor