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Don't emit structors for available_externally globals (PR19933)

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We would previously assert here when trying to figure out the section
for the global.

This makes us handle the situation more gracefully since the IR isn't
malformed.

Differential Revision: http://reviews.llvm.org/D4022

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210215 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Hans Wennborg 2014-06-04 21:04:54 +00:00
parent cfee6c49ea
commit 6248abf28d
2 changed files with 20 additions and 5 deletions
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11
lib/CodeGen/AsmPrinter/AsmPrinter.cpp
View File

@ -1349,9 +1349,14 @@ void AsmPrinter::EmitXXStructorList(const Constant *List, bool isCtor) {
const TargetLoweringObjectFile &Obj = getObjFileLowering();
const MCSymbol *KeySym = nullptr;
const MCSection *KeySec = nullptr;
if (S.ComdatKey) {
KeySym = getSymbol(S.ComdatKey);
KeySec = getObjFileLowering().SectionForGlobal(S.ComdatKey, *Mang, TM);
if (GlobalValue *GV = S.ComdatKey) {
if (GV->hasAvailableExternallyLinkage())
// If the associated variable is available_externally, some other TU
// will provide its dynamic initializer.
continue;
KeySym = getSymbol(GV);
KeySec = getObjFileLowering().SectionForGlobal(GV, *Mang, TM);
}
const MCSection *OutputSection =
(isCtor ? Obj.getStaticCtorSection(S.Priority, KeySym, KeySec)

14
test/MC/COFF/global_ctors_dtors.ll
View File

@ -11,9 +11,10 @@
%ini = type { i32, void()*, i8* }
@llvm.global_ctors = appending global [2 x %ini ] [
@llvm.global_ctors = appending global [3 x %ini ] [
%ini { i32 65535, void ()* @a_global_ctor, i8* null },
%ini { i32 65535, void ()* @b_global_ctor, i8* bitcast (i32* @b to i8*) }
%ini { i32 65535, void ()* @b_global_ctor, i8* bitcast (i32* @b to i8*) },
%ini { i32 65535, void ()* @c_global_ctor, i8* bitcast (i32* @c to i8*) }
]
@llvm.global_dtors = appending global [1 x %ini ] [%ini { i32 65535, void ()* @a_global_dtor, i8* null }]
@ -26,11 +27,18 @@ define void @a_global_ctor() nounwind {
@b = global i32 zeroinitializer
@c = available_externally dllimport global i32 zeroinitializer
define void @b_global_ctor() nounwind {
store i32 42, i32* @b
ret void
}
define void @c_global_ctor() nounwind {
store i32 42, i32* @c
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
@ -45,11 +53,13 @@ define i32 @main() nounwind {
; WIN32: a_global_ctor
; WIN32: .section .CRT$XCU,"rd",associative .bss,{{_?}}b
; WIN32: b_global_ctor
; WIN32-NOT: c_global_ctor
; WIN32: .section .CRT$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-NOT: c_global_ctor
; MINGW32: .section .dtors,"wd"
; MINGW32: a_global_dtor