lld/test/ELF/linkerscript/sections-keep.s

   1 # REQUIRES: x86
   2 # RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %s -o %t.o
   3 # RUN: llvm-mc -filetype=obj -triple=x86_64-unknown-linux %p/Inputs/keep.s -o %t1.o
   4
   5 ## First check that section "keep" is garbage collected without using KEEP
   6 # RUN: echo "SECTIONS { \
   7 # RUN:  .text : { *(.text) } \
   8 # RUN:  .keep : { *(.keep) } \
   9 # RUN:  .temp : { *(.temp) }}" > %t.script
  10 # RUN: ld.lld --gc-sections -o %t --script %t.script %t.o
  11 # RUN: llvm-objdump --section-headers %t | \
  12 # RUN:   FileCheck -check-prefix=SECGC %s
  13 # SECGC:      Sections:
  14 # SECGC-NEXT: Idx Name          Size
  15 # SECGC-NEXT:   0               00000000
  16 # SECGC-NEXT:   1 .text         00000007
  17 # SECGC-NEXT:   2 .temp         00000004
  18
  19 ## Now apply KEEP command to preserve the section.
  20 # RUN: echo "SECTIONS { \
  21 # RUN:  .text : { *(.text) } \
  22 # RUN:  .keep : { KEEP(*(.keep)) } \
  23 # RUN:  .temp : { *(.temp) }}" > %t.script
  24 # RUN: ld.lld --gc-sections -o %t --script %t.script %t.o
  25 # RUN: llvm-objdump --section-headers %t | \
  26 # RUN:   FileCheck -check-prefix=SECNOGC %s
  27 # SECNOGC:      Sections:
  28 # SECNOGC-NEXT: Idx Name          Size
  29 # SECNOGC-NEXT:   0               00000000
  30 # SECNOGC-NEXT:   1 .text         00000007
  31 # SECNOGC-NEXT:   2 .keep         00000004
  32 # SECNOGC-NEXT:   3 .temp         00000004
  33
  34 ## A section name matches two entries in the SECTIONS directive. The
  35 ## first one doesn't have KEEP, the second one does. If section that have
  36 ## KEEP is the first in order then section is NOT collected.
  37 # RUN: echo "SECTIONS { \
  38 # RUN:  . = SIZEOF_HEADERS; \
  39 # RUN:  .keep : { KEEP(*(.keep)) } \
  40 # RUN:  .nokeep : { *(.keep) }}" > %t.script
  41 # RUN: ld.lld --gc-sections -o %t --script %t.script %t.o
  42 # RUN: llvm-objdump --section-headers %t | FileCheck --check-prefix=MIXED1 %s
  43 # MIXED1:      Sections:
  44 # MIXED1-NEXT: Idx Name          Size
  45 # MIXED1-NEXT:   0               00000000
  46 # MIXED1-NEXT:   1 .keep         00000004
  47 # MIXED1-NEXT:   2 .temp         00000004 0000000000000124
  48 # MIXED1-NEXT:   3 .text         00000007 0000000000000128
  49 # MIXED1-NEXT:   4 .comment      00000008 0000000000000000
  50 # MIXED1-NEXT:   5 .symtab       00000060 0000000000000000
  51 # MIXED1-NEXT:   6 .shstrtab     00000036 0000000000000000
  52 # MIXED1-NEXT:   7 .strtab       00000012 0000000000000000
  53
  54 ## The same, but now section without KEEP is at first place.
  55 ## gold and bfd linkers disagree here. gold collects .keep while
  56 ## bfd keeps it. Our current behavior is compatible with bfd although
  57 ## we can choose either way.
  58 # RUN: echo "SECTIONS { \
  59 # RUN:  . = SIZEOF_HEADERS; \
  60 # RUN:  .nokeep : { *(.keep) } \
  61 # RUN:  .keep : { KEEP(*(.keep)) }}" > %t.script
  62 # RUN: ld.lld --gc-sections -o %t --script %t.script %t.o
  63 # RUN: llvm-objdump --section-headers %t | FileCheck --check-prefix=MIXED2 %s
  64 # MIXED2:      Sections:
  65 # MIXED2-NEXT: Idx Name          Size
  66 # MIXED2-NEXT:   0               00000000
  67 # MIXED2-NEXT:   1 .nokeep       00000004 0000000000000120
  68 # MIXED2-NEXT:   2 .temp         00000004 0000000000000124
  69 # MIXED2-NEXT:   3 .text         00000007 0000000000000128
  70 # MIXED2-NEXT:   4 .comment      00000008 0000000000000000
  71 # MIXED2-NEXT:   5 .symtab       00000060 0000000000000000
  72 # MIXED2-NEXT:   6 .shstrtab     00000038 0000000000000000
  73 # MIXED2-NEXT:   7 .strtab       00000012 0000000000000000
  74
  75 # Check file pattern for kept sections.
  76 # RUN: echo "SECTIONS { \
  77 # RUN:  . = SIZEOF_HEADERS; \
  78 # RUN:  .keep : { KEEP(*1.o(.keep)) } \
  79 # RUN:  }" > %t.script
  80 # RUN: ld.lld --gc-sections -o %t --script %t.script %t1.o %t.o
  81 # RUN: llvm-objdump -s %t | FileCheck --check-prefix=FILEMATCH %s
  82 # FILEMATCH:        Contents of section .keep:
  83 # FILEMATCH-NEXT:   0120 41414141  AAAA
  84
  85 .global _start
  86 _start:
  87  mov temp, %eax
  88
  89 .section .keep, "a"
  90 keep:
  91  .long 1
  92
  93 .section .temp, "a"
  94 temp:
  95  .long 2