lld/test/ELF/emit-relocs-discard-locals.s

   1 # REQUIRES: x86
   2 ## Test that --emit-relocs keeps local symbols which are used in relocations
   3 ## even when --discard-{locals,all} is given.
   4
   5 ## There are two separate code paths that mark used local symbols when
   6 ## --gc-sections is specified and when is not. The test checks both.
   7
   8 # RUN: llvm-mc -filetype=obj -triple=x86_64 -save-temp-labels %s -o %t.o
   9
  10 # RUN: ld.lld --emit-relocs --discard-locals %t.o -o %tlocal
  11 # RUN: llvm-readelf -s %tlocal | FileCheck --check-prefixes=DISCARD-LOCALS,DISCARD-LOCALS-NOGC %s
  12 # RUN: llvm-readobj -r %tlocal | FileCheck --check-prefix=REL %s
  13
  14 ## --gc-sections can discard symbols relative to GCed sections (including STT_SECTION).
  15 # RUN: ld.lld --emit-relocs --discard-locals --gc-sections %t.o -o %tlocal.gc
  16 # RUN: llvm-readelf -s %tlocal.gc | FileCheck --check-prefix=DISCARD-LOCALS %s
  17 # RUN: llvm-readobj -r %tlocal | FileCheck --check-prefix=REL %s
  18
  19 # RUN: ld.lld --emit-relocs --discard-all %t.o -o %tall
  20 # RUN: llvm-readelf -s %tall | FileCheck --check-prefixes=DISCARD-ALL,DISCARD-ALL-NOGC %s
  21 # RUN: llvm-readobj -r %tall | FileCheck --check-prefix=REL %s
  22
  23 # RUN: ld.lld --emit-relocs --discard-all --gc-sections %t.o -o %tall.gc
  24 # RUN: llvm-readelf -s %tall.gc | FileCheck --check-prefix=DISCARD-ALL %s
  25 # RUN: llvm-readobj -r %tall.gc | FileCheck --check-prefix=REL %s
  26
  27 ## --discard-locals removes unused local symbols which start with ".L"
  28 # DISCARD-LOCALS:    0: {{0+}} 0 NOTYPE  LOCAL  DEFAULT UND
  29 # DISCARD-LOCALS-NEXT:           NOTYPE  LOCAL  DEFAULT {{.*}} .Lused
  30 # DISCARD-LOCALS-NEXT:           NOTYPE  LOCAL  DEFAULT {{.*}} used
  31 # DISCARD-LOCALS-NEXT:           NOTYPE  LOCAL  DEFAULT {{.*}} unused
  32 # DISCARD-LOCALS-NOGC-NEXT:      NOTYPE  LOCAL  DEFAULT {{.*}} unused_gc
  33 # DISCARD-LOCALS-NEXT:           SECTION LOCAL  DEFAULT {{.*}} .text
  34 # DISCARD-LOCALS-NEXT:           SECTION LOCAL  DEFAULT {{.*}} text
  35 # DISCARD-LOCALS-NOGC-NEXT:      SECTION LOCAL  DEFAULT {{.*}} gc
  36 # DISCARD-LOCALS-NEXT:           SECTION LOCAL  DEFAULT {{.*}} .comment
  37 # DISCARD-LOCALS-NEXT:           NOTYPE  GLOBAL DEFAULT {{.*}} _start
  38
  39 ## --discard-all removes all unused regular local symbols.
  40 # DISCARD-ALL:       0: {{0+}} 0 NOTYPE  LOCAL  DEFAULT UND
  41 # DISCARD-ALL-NEXT:              NOTYPE  LOCAL  DEFAULT {{.*}} .Lused
  42 # DISCARD-ALL-NEXT:              NOTYPE  LOCAL  DEFAULT {{.*}} used
  43 # DISCARD-ALL-NEXT:              SECTION LOCAL  DEFAULT {{.*}} .text
  44 # DISCARD-ALL-NEXT:              SECTION LOCAL  DEFAULT {{.*}} text
  45 # DISCARD-ALL-NOGC-NEXT:         SECTION LOCAL  DEFAULT {{.*}} gc
  46 # DISCARD-ALL-NEXT:              SECTION LOCAL  DEFAULT {{.*}} .comment
  47 # DISCARD-ALL-NEXT:              NOTYPE  GLOBAL DEFAULT {{.*}} _start
  48
  49 # REL:      .rela.text {
  50 # REL-NEXT:   R_X86_64_PLT32 text 0xFFFFFFFFFFFFFFFC
  51 # REL-NEXT:   R_X86_64_PLT32 .Lused 0xFFFFFFFFFFFFFFFC
  52 # REL-NEXT:   R_X86_64_PLT32 used 0xFFFFFFFFFFFFFFFC
  53 # REL-NEXT: }
  54
  55 .globl _start
  56 _start:
  57   call text@plt
  58   jmp .Lused@plt
  59   call used@plt
  60
  61 .section text,"ax"
  62 .Lunused:
  63 .Lused:
  64 unused:
  65 used:
  66
  67 .section gc,"ax"
  68 .Lunused_gc:
  69 unused_gc:
  70   ret