forked from OSchip/llvm-project
[ELF] -z combreloc: sort dynamic relocations by (!is_relative,symbol_index,r_offset)
We currently sort dynamic relocations by (!is_relative,symbol_index).
Add r_offset as the third key. This makes `readelf -r` debugging easier
(relocations to the same symbol are ordered by r_offset).
Refactor the test combreloc.s (renamed from combrelocs.s) to check
R_X86_64_RELATIVE, and delete --expand-relocs.
The difference from the reverted D61477 is that we keep !is_relative as
the first key. In local dynamic TLS model, DTPMOD (e.g.
R_ARM_TLS_DTPMOD32 R_X86_64_DTPMOD and R_PPC{,64}_DTPMOD) may use 0 as
the symbol index.
Reviewed By: grimar
Differential Revision: https://reviews.llvm.org/D62141
llvm-svn: 361164
This commit is contained in:
Fangrui Song
parent
1e593f342f
commit
055906e1e5
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@ -1488,17 +1488,17 @@ RelocationSection<ELFT>::RelocationSection(StringRef Name, bool Sort)
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this->Entsize = Config->IsRela ? sizeof(Elf_Rela) : sizeof(Elf_Rel);
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}
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static bool compRelocations(const DynamicReloc &A, const DynamicReloc &B) {
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bool AIsRel = A.Type == Target->RelativeRel;
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bool BIsRel = B.Type == Target->RelativeRel;
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if (AIsRel != BIsRel)
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return AIsRel;
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return A.getSymIndex() < B.getSymIndex();
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}
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template <class ELFT> void RelocationSection<ELFT>::writeTo(uint8_t *Buf) {
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// Sort by (!IsRelative,SymIndex,r_offset). DT_REL[A]COUNT requires us to
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// place R_*_RELATIVE first. SymIndex is to improve locality, while r_offset
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// is to make results easier to read.
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if (Sort)
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llvm::stable_sort(Relocs, compRelocations);
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llvm::stable_sort(Relocs, [](const DynamicReloc &A, const DynamicReloc &B) {
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return std::make_tuple(A.Type != Target->RelativeRel, A.getSymIndex(),
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A.getOffset()) <
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std::make_tuple(B.Type != Target->RelativeRel, B.getSymIndex(),
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B.getOffset());
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});
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for (const DynamicReloc &Rel : Relocs) {
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encodeDynamicReloc<ELFT>(reinterpret_cast<Elf_Rela *>(Buf), Rel);
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@ -0,0 +1,48 @@
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# REQUIRES: x86
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# RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t.o
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# RUN: echo 'mov aaa@gotpcrel(%rip), %rax' | llvm-mc -filetype=obj -triple=x86_64 - -o %t1.o
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# RUN: ld.lld -shared %t.o %t1.o -o %t.so
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# RUN: llvm-readobj -r --dynamic-table %t.so | FileCheck %s
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# RUN: ld.lld -shared %t.o %t1.o -o %t.so -z combreloc
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# RUN: llvm-readobj -r --dynamic-table %t.so | FileCheck %s
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# -z combreloc is the default: sort relocations by (!IsRelative,SymIndex,r_offset),
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# and emit DT_RELACOUNT (except on MIPS) to indicate the number of relative
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# relocations.
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# CHECK: Relocations [
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# CHECK-NEXT: Section ({{.*}}) .rela.dyn {
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# CHECK-NEXT: 0x3020 R_X86_64_RELATIVE - 0x3028
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# CHECK-NEXT: 0x20B0 R_X86_64_GLOB_DAT aaa 0x0
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# CHECK-NEXT: 0x3000 R_X86_64_64 aaa 0x0
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# CHECK-NEXT: 0x3018 R_X86_64_64 aaa 0x0
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# CHECK-NEXT: 0x3010 R_X86_64_64 bbb 0x0
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# CHECK-NEXT: 0x3008 R_X86_64_64 ccc 0x0
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# CHECK-NEXT: }
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# CHECK: DynamicSection [
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# CHECK: RELACOUNT 1
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# RUN: ld.lld -z nocombreloc -shared %t.o %t1.o -o %t.so
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# RUN: llvm-readobj -r --dynamic-table %t.so | FileCheck --check-prefix=NOCOMB %s
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# NOCOMB: Relocations [
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# NOCOMB-NEXT: Section ({{.*}}) .rela.dyn {
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# NOCOMB-NEXT: 0x3000 R_X86_64_64 aaa 0x0
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# NOCOMB-NEXT: 0x3008 R_X86_64_64 ccc 0x0
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# NOCOMB-NEXT: 0x3010 R_X86_64_64 bbb 0x0
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# NOCOMB-NEXT: 0x3018 R_X86_64_64 aaa 0x0
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# NOCOMB-NEXT: 0x3020 R_X86_64_RELATIVE - 0x3028
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# NOCOMB-NEXT: 0x20A0 R_X86_64_GLOB_DAT aaa 0x0
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# NOCOMB-NEXT: }
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# NOCOMB: DynamicSection [
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# NOCOMB-NOT: RELACOUNT
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.data
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.quad aaa
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.quad ccc
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.quad bbb
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.quad aaa
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.quad relative
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relative:
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@ -1,95 +0,0 @@
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# REQUIRES: x86
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# RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t.o
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# RUN: ld.lld -shared %t.o -o %t.out
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# RUN: llvm-readobj -r --expand-relocs --dynamic-table %t.out | FileCheck %s
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# RUN: ld.lld -shared %t.o -o %t.out -z combreloc
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# RUN: llvm-readobj -r --expand-relocs --dynamic-table %t.out | FileCheck %s
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# CHECK: Relocations [
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# CHECK-NEXT: Section ({{.*}}) .rela.dyn {
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# CHECK-NEXT: Relocation {
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# CHECK-NEXT: Offset: 0x2000
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# CHECK-NEXT: Type: R_X86_64_64
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# CHECK-NEXT: Symbol: aaa (1)
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# CHECK-NEXT: Addend: 0x0
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# CHECK-NEXT: }
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# CHECK-NEXT: Relocation {
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# CHECK-NEXT: Offset: 0x2018
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# CHECK-NEXT: Type: R_X86_64_64
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# CHECK-NEXT: Symbol: aaa (1)
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# CHECK-NEXT: Addend: 0x0
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# CHECK-NEXT: }
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# CHECK-NEXT: Relocation {
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# CHECK-NEXT: Offset: 0x2010
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# CHECK-NEXT: Type: R_X86_64_64
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# CHECK-NEXT: Symbol: bbb (2)
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# CHECK-NEXT: Addend: 0x0
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# CHECK-NEXT: }
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# CHECK-NEXT: Relocation {
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# CHECK-NEXT: Offset: 0x2008
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# CHECK-NEXT: Type: R_X86_64_64
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# CHECK-NEXT: Symbol: ccc (3)
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# CHECK-NEXT: Addend: 0x0
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# CHECK-NEXT: }
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# CHECK-NEXT: Relocation {
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# CHECK-NEXT: Offset: 0x2020
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# CHECK-NEXT: Type: R_X86_64_64
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# CHECK-NEXT: Symbol: ddd (4)
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# CHECK-NEXT: Addend: 0x0
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# CHECK-NEXT: }
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# CHECK-NEXT: }
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# CHECK-NEXT: ]
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# CHECK: DynamicSection [
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# CHECK-NEXT: Tag
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# CHECK-NOT: RELACOUNT
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# RUN: ld.lld -z nocombreloc -shared %t.o -o %t.out
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# RUN: llvm-readobj -r --expand-relocs --dynamic-table %t.out | \
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# RUN: FileCheck --check-prefix=NOCOMB %s
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# NOCOMB: Relocations [
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# NOCOMB-NEXT: Section ({{.*}}) .rela.dyn {
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# NOCOMB-NEXT: Relocation {
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# NOCOMB-NEXT: Offset: 0x2000
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# NOCOMB-NEXT: Type: R_X86_64_64
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# NOCOMB-NEXT: Symbol: aaa (1)
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# NOCOMB-NEXT: Addend: 0x0
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# NOCOMB-NEXT: }
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# NOCOMB-NEXT: Relocation {
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# NOCOMB-NEXT: Offset: 0x2008
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# NOCOMB-NEXT: Type: R_X86_64_64
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# NOCOMB-NEXT: Symbol: ccc (3)
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# NOCOMB-NEXT: Addend: 0x0
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# NOCOMB-NEXT: }
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# NOCOMB-NEXT: Relocation {
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# NOCOMB-NEXT: Offset: 0x2010
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# NOCOMB-NEXT: Type: R_X86_64_64
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# NOCOMB-NEXT: Symbol: bbb (2)
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# NOCOMB-NEXT: Addend: 0x0
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# NOCOMB-NEXT: }
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# NOCOMB-NEXT: Relocation {
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# NOCOMB-NEXT: Offset: 0x2018
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# NOCOMB-NEXT: Type: R_X86_64_64
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# NOCOMB-NEXT: Symbol: aaa (1)
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# NOCOMB-NEXT: Addend: 0x0
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# NOCOMB-NEXT: }
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# NOCOMB-NEXT: Relocation {
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# NOCOMB-NEXT: Offset: 0x2020
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# NOCOMB-NEXT: Type: R_X86_64_64
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# NOCOMB-NEXT: Symbol: ddd (4)
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# NOCOMB-NEXT: Addend: 0x0
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# NOCOMB-NEXT: }
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# NOCOMB-NEXT: }
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# NOCOMB-NEXT: ]
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# NOCOMB: DynamicSection [
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# NOCOMB-NEXT: Tag
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# NOCOMB-NOT: RELACOUNT
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.data
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.quad aaa
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.quad ccc
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.quad bbb
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.quad aaa
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.quad ddd
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@ -14,8 +14,8 @@
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# CHECK: Relocations [
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# CHECK-NEXT: Section (4) .rel.dyn {
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# CHECK-NEXT: 0x{{[0-9A-F]+}} R_386_COPY foo
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# CHECK-NEXT: 0x{{[0-9A-F]+}} R_386_GLOB_DAT foo
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# CHECK-NEXT: 0x{{[0-9A-F]+}} R_386_COPY foo
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# CHECK-NEXT: }
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# CHECK-NEXT: ]
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