emit-relocs-discard-locals.s
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# REQUIRES: x86
## Test that --emit-relocs keeps local symbols which are used in relocations
## even when --discard-{locals,all} is given.
## There are two separate code paths that mark used local symbols when
## --gc-sections is specified and when is not. The test checks both.
# RUN: llvm-mc -filetype=obj -triple=x86_64 -save-temp-labels %s -o %t.o
# RUN: ld.lld --emit-relocs --discard-locals %t.o -o %tlocal
# RUN: llvm-readelf -s %tlocal | FileCheck --check-prefixes=DISCARD-LOCALS,DISCARD-LOCALS-NOGC %s
# RUN: llvm-readobj -r %tlocal | FileCheck --check-prefix=REL %s
## --gc-sections can discard symbols relative to GCed sections (including STT_SECTION).
# RUN: ld.lld --emit-relocs --discard-locals --gc-sections %t.o -o %tlocal.gc
# RUN: llvm-readelf -s %tlocal.gc | FileCheck --check-prefix=DISCARD-LOCALS %s
# RUN: llvm-readobj -r %tlocal | FileCheck --check-prefix=REL %s
# RUN: ld.lld --emit-relocs --discard-all %t.o -o %tall
# RUN: llvm-readelf -s %tall | FileCheck --check-prefixes=DISCARD-ALL,DISCARD-ALL-NOGC %s
# RUN: llvm-readobj -r %tall | FileCheck --check-prefix=REL %s
# RUN: ld.lld --emit-relocs --discard-all --gc-sections %t.o -o %tall.gc
# RUN: llvm-readelf -s %tall.gc | FileCheck --check-prefix=DISCARD-ALL %s
# RUN: llvm-readobj -r %tall.gc | FileCheck --check-prefix=REL %s
## --discard-locals removes unused local symbols which start with ".L"
# DISCARD-LOCALS: 0: {{0+}} 0 NOTYPE LOCAL DEFAULT UND
# DISCARD-LOCALS-NEXT: NOTYPE LOCAL DEFAULT {{.*}} .Lused
# DISCARD-LOCALS-NEXT: NOTYPE LOCAL DEFAULT {{.*}} unused
# DISCARD-LOCALS-NOGC-NEXT: NOTYPE LOCAL DEFAULT {{.*}} unused_gc
# DISCARD-LOCALS-NEXT: NOTYPE LOCAL DEFAULT {{.*}} used
# DISCARD-LOCALS-NEXT: SECTION LOCAL DEFAULT {{.*}} .text
# DISCARD-LOCALS-NEXT: SECTION LOCAL DEFAULT {{.*}} text
# DISCARD-LOCALS-NOGC-NEXT: SECTION LOCAL DEFAULT {{.*}} gc
# DISCARD-LOCALS-NEXT: SECTION LOCAL DEFAULT {{.*}} .comment
# DISCARD-LOCALS-NEXT: NOTYPE GLOBAL DEFAULT {{.*}} _start
## --discard-all removes all unused regular local symbols.
# DISCARD-ALL: 0: {{0+}} 0 NOTYPE LOCAL DEFAULT UND
# DISCARD-ALL-NEXT: NOTYPE LOCAL DEFAULT {{.*}} .Lused
# DISCARD-ALL-NEXT: NOTYPE LOCAL DEFAULT {{.*}} used
# DISCARD-ALL-NEXT: SECTION LOCAL DEFAULT {{.*}} .text
# DISCARD-ALL-NEXT: SECTION LOCAL DEFAULT {{.*}} text
# DISCARD-ALL-NOGC-NEXT: SECTION LOCAL DEFAULT {{.*}} gc
# DISCARD-ALL-NEXT: SECTION LOCAL DEFAULT {{.*}} .comment
# DISCARD-ALL-NEXT: NOTYPE GLOBAL DEFAULT {{.*}} _start
# REL: .rela.text {
# REL-NEXT: R_X86_64_PLT32 text 0xFFFFFFFFFFFFFFFC
# REL-NEXT: R_X86_64_PLT32 .Lused 0xFFFFFFFFFFFFFFFC
# REL-NEXT: R_X86_64_PLT32 used 0xFFFFFFFFFFFFFFFC
# REL-NEXT: }
.globl _start
_start:
call text@plt
jmp .Lused@plt
call used@plt
.section text,"ax"
.Lunused:
.Lused:
unused:
used:
.section gc,"ax"
.Lunused_gc:
unused_gc:
ret