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ELF: Sort .[cd]tors by priority as we do for .{init,fini}_array. 

llvm-svn: 260477
This commit is contained in:
Rui Ueyama 2016-02-11 01:07:19 +00:00
parent c2dca5d76e
commit 6f46de21e1
2 changed files with 40 additions and 1 deletions
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4
lld/ELF/Writer.cpp
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@ -726,7 +726,7 @@ StringRef Writer<ELFT>::getOutputSectionName(StringRef S) const {
return It->second;
for (StringRef V : {".text.", ".rodata.", ".data.rel.ro.", ".data.", ".bss.",
".init_array.", ".fini_array."})
".init_array.", ".fini_array.", ".ctors.", ".dtors."})
if (S.startswith(V))
return V.drop_back();
return S;
@ -966,6 +966,8 @@ template <class ELFT> bool Writer<ELFT>::createSections() {
// Sort section contents for __attribute__((init_priority(N)).
sortByPriority(Out<ELFT>::Dynamic->InitArraySec);
sortByPriority(Out<ELFT>::Dynamic->FiniArraySec);
sortByPriority(Factory.lookup(".ctors", SHT_PROGBITS, SHF_WRITE | SHF_ALLOC));
sortByPriority(Factory.lookup(".dtors", SHT_PROGBITS, SHF_WRITE | SHF_ALLOC));
// The linker needs to define SECNAME_start, SECNAME_end and SECNAME_stop
// symbols for sections, so that the runtime can get the start and end

37
lld/test/ELF/ctors_dtors_priority.s Normal file
View File

@ -0,0 +1,37 @@
// RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t
// RUN: ld.lld %t -o %t.exe
// RUN: llvm-objdump -s %t.exe | FileCheck %s
// REQUIRES: x86
.globl _start
_start:
nop
.section .ctors, "aw", @progbits
.align 8
.byte 1
.section .ctors.100, "aw", @progbits
.long 2
.section .ctors.5, "aw", @progbits
.byte 3
.section .ctors, "aw", @progbits
.byte 4
.section .ctors, "aw", @progbits
.byte 5
.section .dtors, "aw", @progbits
.align 8
.byte 0x11
.section .dtors.100, "aw", @progbits
.long 0x12
.section .dtors.5, "aw", @progbits
.byte 0x13
.section .dtors, "aw", @progbits
.byte 0x14
.section .dtors, "aw", @progbits
.byte 0x15
// CHECK: Contents of section .ctors:
// CHECK-NEXT: 03020000 00000000 010405
// CHECK: Contents of section .dtors:
// CHECK-NEXT: 13120000 00000000 111415