lld/test/ELF/shuffle-sections.s

   1 # REQUIRES: x86
   2 # RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t.o
   3
   4 # RUN: ld.lld %t.o -o %t.out
   5 # RUN: llvm-readelf -x .text %t.out | FileCheck %s
   6 # CHECK: Hex dump of section '.text':
   7 # CHECK-NEXT: 01020304
   8
   9 ## --shuffle-sections= shuffles input sections.
  10 # RUN: ld.lld --shuffle-sections='*=1' %t.o -o %t1.out
  11 # RUN: llvm-readelf -x .text %t1.out | FileCheck %s --check-prefix=SHUFFLE1
  12 # SHUFFLE1: Hex dump of section '.text':
  13 # SHUFFLE1-NEXT: 030402cc 01
  14
  15 ## Test that --shuffle-sections= can be used with --symbol-ordering-file
  16 # RUN: echo "foo" > %t_order.txt
  17 # RUN: echo "_start " >> %t_order.txt
  18
  19 # RUN: ld.lld --symbol-ordering-file %t_order.txt --shuffle-sections='*=2' %t.o -o %t2.out
  20 # RUN: llvm-readelf -x .text %t2.out | FileCheck %s --check-prefix=SHUFFLE2
  21 # SHUFFLE2: Hex dump of section '.text':
  22 # SHUFFLE2-NEXT: 02cccccc 010304
  23
  24 # RUN: ld.lld -z norelro --symbol-ordering-file %t_order.txt --shuffle-sections='*=3' %t.o -o %t3.out
  25 # RUN: llvm-readelf -x .text %t3.out | FileCheck %s --check-prefix=SHUFFLE3
  26 # SHUFFLE3: Hex dump of section '.text':
  27 # SHUFFLE3-NEXT: 02cccccc 010403
  28
  29 ## As a special case, -1 reverses sections as a stable transform.
  30 # RUN: ld.lld --shuffle-sections '*=-1' %t.o -o %t-1.out
  31 # RUN: llvm-readelf -x .text %t-1.out | FileCheck %s --check-prefix=SHUFFLE-1
  32 # SHUFFLE-1: Hex dump of section '.text':
  33 # SHUFFLE-1-NEXT: 040302cc 01
  34
  35 ## .text does not change its order while .text.{foo,bar,zed} are reversed.
  36 # RUN: ld.lld --shuffle-sections '.text.*=-1' %t.o -o %t4.out
  37 # RUN: llvm-readelf -x .text %t4.out | FileCheck %s --check-prefix=SHUFFLE4
  38 # SHUFFLE4: Hex dump of section '.text':
  39 # SHUFFLE4-NEXT: 01040302
  40
  41 ## Reversing twice restores the original order.
  42 # RUN: ld.lld --shuffle-sections '.text.*=-1' --shuffle-sections '.text.*=-1' %t.o -o %t.out
  43 # RUN: llvm-readelf -x .text %t.out | FileCheck %s
  44
  45 ## Test all possible invalid cases.
  46 # RUN: not ld.lld --shuffle-sections= 2>&1 | FileCheck %s --check-prefix=USAGE -DV=
  47 # RUN: not ld.lld --shuffle-sections=a= 2>&1 | FileCheck %s --check-prefix=USAGE -DV=a=
  48 # RUN: not ld.lld --shuffle-sections==0 2>&1 | FileCheck %s --check-prefix=USAGE -DV==0
  49 # RUN: not ld.lld --shuffle-sections=a 2>&1 | FileCheck %s --check-prefix=USAGE -DV=a
  50
  51 # USAGE: error: --shuffle-sections=: expected <section_glob>=<seed>, but got '[[V]]'
  52
  53 # RUN: not ld.lld --shuffle-sections='['=0 2>&1 | FileCheck %s --check-prefix=INVALID
  54
  55 # INVALID: error: --shuffle-sections=: invalid glob pattern, unmatched '[': [
  56
  57 ## .text has an alignment of 4.
  58 .global _start
  59 _start:
  60   .byte 1
  61
  62 .section .text.foo,"ax"
  63 .global foo
  64 foo:
  65   .byte 2
  66
  67 .section .text.bar,"ax"
  68 .global bar
  69 bar:
  70   .byte 3
  71
  72 .section .text.zed,"ax"
  73 .global zed
  74 zed:
  75   .byte 4