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[ELF] Name MergeSyntheticSection using an input section instead of the output section

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In a link map, the input section name gives more information. See the updated
merge-entsize.s for an example. The output file is unchanged.

Compiler generated input sections with the SHF_MERGE flag have names such as
.rodata.str1.1 and .rodata.cstN, and are not affected by -fdata-sections.

Reviewed By: peter.smith

Differential Revision: https://reviews.llvm.org/D149466
This commit is contained in:
Fangrui Song
2023-05-02 09:35:00 -07:00
parent 009c053e3f
commit 1408504564
3 changed files with 12 additions and 3 deletions
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2
lld/ELF/OutputSections.cpp
View File

@@ -217,7 +217,7 @@ void OutputSection::finalizeInputSections() {
});
if (i == mergeSections.end()) {
MergeSyntheticSection *syn =
createMergeSynthetic(name, ms->type, ms->flags, ms->addralign);
createMergeSynthetic(s->name, ms->type, ms->flags, ms->addralign);
mergeSections.push_back(syn);
i = std::prev(mergeSections.end());
syn->entsize = ms->entsize;

6
lld/test/ELF/merge-entsize.s
View File

@@ -1,8 +1,12 @@
// REQUIRES: x86
// RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
// RUN: ld.lld %t.o -o %t
// RUN: ld.lld %t.o -o %t -M | FileCheck %s --check-prefix=MAP
// RUN: llvm-readobj -S %t | FileCheck %s
// MAP: .rodata{{$}}
// MAP-NEXT: <internal>:(.rodata.1)
// MAP-NEXT: <internal>:(.rodata.2)
.section .rodata.1,"aM",@progbits,1
.p2align 2
.byte 0x42

7
lld/test/ELF/merge-string-align.s
View File

@@ -1,8 +1,13 @@
// REQUIRES: x86
// RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o
// RUN: ld.lld %t.o -o %t.so -shared
// RUN: ld.lld %t.o -o %t.so -shared -M | FileCheck %s --check-prefix=MAP
// RUN: llvm-readobj -S --section-data %t.so | FileCheck %s
// MAP: .rodata{{$}}
// MAP-NEXT: <internal>:(.rodata.foo)
// MAP-NEXT: .rodata2
// MAP-NEXT: <internal>:(.rodata2)
.section .rodata.foo,"aMS",@progbits,1
.align 16
.asciz "foo"