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[static initializers] Emit global_ctors and global_dtors in reverse order when .ctors/.dtors are used.

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Reviewed By: rnk, MaskRay, efriedma

Differential Revision: https://reviews.llvm.org/D103495
This commit is contained in:
Wolfgang Pieb 2021-06-02 11:37:35 -07:00
parent 324eb2c007
commit 249a0bf5b1
4 changed files with 40 additions and 17 deletions
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5
lib/CodeGen/AsmPrinter/AsmPrinter.cpp
View File

@ -2306,6 +2306,11 @@ void AsmPrinter::emitXXStructorList(const DataLayout &DL, const Constant *List,
if (Structors.empty())
return;
// Emit the structors in reverse order if we are using the .ctor/.dtor
// initialization scheme.
if (!TM.Options.UseInitArray)
std::reverse(Structors.begin(), Structors.end());
const Align Align = DL.getPointerPrefAlignment();
for (Structor &S : Structors) {
const TargetLoweringObjectFile &Obj = getObjFileLowering();

8
test/CodeGen/SPARC/constructor.ll
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@ -14,12 +14,12 @@ entry:
ret void
}
; CTOR: .section .ctors.65520,#alloc,#write
; CTOR-NEXT: .p2align 2
; CTOR-NEXT: .word g
; CTOR-NEXT: .section .ctors,#alloc,#write
; CTOR: .section .ctors,#alloc,#write
; CTOR-NEXT: .p2align 2
; CTOR-NEXT: .word f
; CTOR-NEXT: .section .ctors.65520,#alloc,#write
; CTOR-NEXT: .p2align 2
; CTOR-NEXT: .word g
; INIT-ARRAY: .section .init_array.15,#alloc,#write
; INIT-ARRAY-NEXT: .p2align 2

16
test/CodeGen/X86/2011-08-29-InitOrder.ll
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@ -3,24 +3,24 @@
; PR5329
@llvm.global_ctors = appending global [3 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 2000, void ()* @construct_2, i8* null }, { i32, void ()*, i8* } { i32 3000, void ()* @construct_3, i8* null }, { i32, void ()*, i8* } { i32 1000, void ()* @construct_1, i8* null }]
; CHECK-DEFAULT: .section .ctors.64535,"aw",@progbits
; CHECK-DEFAULT: .long construct_1
; CHECK-DEFAULT: .section .ctors.63535,"aw",@progbits
; CHECK-DEFAULT: .long construct_2
; CHECK-DEFAULT: .section .ctors.62535,"aw",@progbits
; CHECK-DEFAULT: .long construct_3
; CHECK-DEFAULT: .section .ctors.63535,"aw",@progbits
; CHECK-DEFAULT: .long construct_2
; CHECK-DEFAULT: .section .ctors.64535,"aw",@progbits
; CHECK-DEFAULT: .long construct_1
; CHECK-DARWIN: .long _construct_1
; CHECK-DARWIN-NEXT: .long _construct_2
; CHECK-DARWIN-NEXT: .long _construct_3
@llvm.global_dtors = appending global [3 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 2000, void ()* @destruct_2, i8* null }, { i32, void ()*, i8* } { i32 1000, void ()* @destruct_1, i8* null }, { i32, void ()*, i8* } { i32 3000, void ()* @destruct_3, i8* null }]
; CHECK-DEFAULT: .section .dtors.64535,"aw",@progbits
; CHECK-DEFAULT: .long destruct_1
; CHECK-DEFAULT: .section .dtors.63535,"aw",@progbits
; CHECK-DEFAULT: .long destruct_2
; CHECK-DEFAULT: .section .dtors.62535,"aw",@progbits
; CHECK-DEFAULT: .long destruct_3
; CHECK-DEFAULT: .section .dtors.63535,"aw",@progbits
; CHECK-DEFAULT: .long destruct_2
; CHECK-DEFAULT: .section .dtors.64535,"aw",@progbits
; CHECK-DEFAULT: .long destruct_1
; CHECK-DARWIN: .long _destruct_1
; CHECK-DARWIN-NEXT: .long _destruct_2

28
test/CodeGen/X86/constructor.ll
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@ -9,7 +9,7 @@
; RUN: llc -mtriple i586-intel-elfiamcu -use-ctors < %s | FileCheck %s --check-prefix=MCU-CTORS
; RUN: llc -mtriple i586-intel-elfiamcu < %s | FileCheck %s --check-prefix=MCU-INIT-ARRAY
; RUN: llc -mtriple x86_64-win32-gnu < %s | FileCheck --check-prefix=COFF-CTOR %s
@llvm.global_ctors = appending global [3 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 65535, void ()* @f, i8* null}, { i32, void ()*, i8* } { i32 15, void ()* @g, i8* @v }, { i32, void ()*, i8* } { i32 55555, void ()* @h, i8* @v }]
@llvm.global_ctors = appending global [5 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 65535, void ()* @f, i8* null}, { i32, void ()*, i8* } { i32 15, void ()* @g, i8* @v }, { i32, void ()*, i8* } { i32 55555, void ()* @h, i8* @v }, { i32, void ()*, i8* } { i32 65535, void ()* @i, i8* null }, { i32, void ()*, i8* } { i32 65535, void ()* @j, i8* null }]
@v = weak_odr global i8 0
@ -28,15 +28,27 @@ entry:
ret void
}
; CTOR: .section .ctors.65520,"aGw",@progbits,v,comdat
define void @i() {
entry:
ret void
}
define void @j() {
entry:
ret void
}
; CTOR: .section .ctors,"aw",@progbits
; CTOR-NEXT: .p2align 3
; CTOR-NEXT: .quad g
; CTOR-NEXT: .quad j
; CTOR-NEXT: .quad i
; CTOR-NEXT: .quad f
; CTOR-NEXT: .section .ctors.09980,"aGw",@progbits,v,comdat
; CTOR-NEXT: .p2align 3
; CTOR-NEXT: .quad h
; CTOR-NEXT: .section .ctors,"aw",@progbits
; CTOR-NEXT: .section .ctors.65520,"aGw",@progbits,v,comdat
; CTOR-NEXT: .p2align 3
; CTOR-NEXT: .quad f
; CTOR-NEXT: .quad g
; INIT-ARRAY: .section .init_array.15,"aGw",@init_array,v,comdat
; INIT-ARRAY-NEXT: .p2align 3
@ -47,6 +59,8 @@ entry:
; INIT-ARRAY-NEXT: .section .init_array,"aw",@init_array
; INIT-ARRAY-NEXT: .p2align 3
; INIT-ARRAY-NEXT: .quad f
; INIT-ARRAY-NEXT: .quad i
; INIT-ARRAY-NEXT: .quad j
; NACL: .section .init_array.15,"aGw",@init_array,v,comdat
; NACL-NEXT: .p2align 2
@ -57,6 +71,8 @@ entry:
; NACL-NEXT: .section .init_array,"aw",@init_array
; NACL-NEXT: .p2align 2
; NACL-NEXT: .long f
; NACL-NEXT: .long i
; NACL-NEXT: .long j
; MCU-CTORS: .section .ctors,"aw",@progbits
; MCU-INIT-ARRAY: .section .init_array,"aw",@init_array
@ -70,3 +86,5 @@ entry:
; COFF-CTOR-NEXT: .section .ctors,"dw"
; COFF-CTOR-NEXT: .p2align 3
; COFF-CTOR-NEXT: .quad f
; COFF-CTOR-NEXT: .quad i
; COFF-CTOR-NEXT: .quad j