lld/test/ELF/linkerscript/icf-output-sections.s

   1 # REQUIRES: x86
   2 # RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t.o
   3 # RUN: echo 'SECTIONS { .text : { *(.text*) } }' > %t1.script
   4
   5 ## Sections within the same output section can be freely folded.
   6 # RUN: ld.lld %t.o --script %t1.script --icf=all --print-icf-sections -o %t | FileCheck --check-prefix=ICF1 %s
   7 # RUN: llvm-readelf -S %t | FileCheck --check-prefix=SEC1 %s --implicit-check-not=.text
   8
   9 # ICF1:      selected section {{.*}}.o:(.text.foo0)
  10 # ICF1-NEXT:   removing identical section {{.*}}.o:(.text.foo1)
  11 # ICF1-NEXT:   removing identical section {{.*}}.o:(.text.bar0)
  12 # ICF1-NEXT:   removing identical section {{.*}}.o:(.text.bar1)
  13
  14 # SEC1: .text   PROGBITS 0000000000000000 001000 000001
  15
  16 ## Sections with different output sections cannot be folded. Without the
  17 ## linker script, .text.foo* and .text.bar* go to the same output section
  18 ## .text and they will be folded.
  19 # RUN: echo 'SECTIONS { .text.foo : {*(.text.foo*)} .text.bar : {*(.text.bar*)} }' > %t2.script
  20 # RUN: ld.lld %t.o --script %t2.script --icf=all --print-icf-sections -o %t | FileCheck --check-prefix=ICF2 %s
  21 # RUN: llvm-readelf -S %t | FileCheck --check-prefix=SEC2 %s
  22
  23 # ICF2:      selected section {{.*}}.o:(.text.foo0)
  24 # ICF2-NEXT:   removing identical section {{.*}}.o:(.text.foo1)
  25 # ICF2-NEXT: selected section {{.*}}.o:(.text.bar0)
  26 # ICF2-NEXT:   removing identical section {{.*}}.o:(.text.bar1)
  27
  28 # SEC2:      .text.foo   PROGBITS 0000000000000000 001000 000001
  29 # SEC2-NEXT: .text.bar   PROGBITS 0000000000000001 001001 000001
  30
  31 ## .text.bar* are orphan sections.
  32 # RUN: echo 'SECTIONS { .text.foo : {*(.text.foo*)} }' > %t3.script
  33 # RUN: ld.lld %t.o -T %t3.script --icf=all --print-icf-sections -o %t3 | FileCheck --check-prefix=ICF3 %s
  34 # RUN: llvm-readelf -S %t3 | FileCheck --check-prefix=SEC3 %s
  35
  36 # ICF3:      selected section {{.*}}.o:(.text.foo0)
  37 # ICF3-NEXT:   removing identical section {{.*}}.o:(.text.foo1)
  38
  39 # SEC3:      Name        Type     Address          Off    Size
  40 # SEC3:      .text.foo   PROGBITS 0000000000000000 001000 000001
  41 # SEC3-NEXT: .text       PROGBITS 0000000000000004 001004 000000
  42 # SEC3-NEXT: .text.bar0  PROGBITS 0000000000000004 001004 000001
  43 # SEC3-NEXT: .text.bar1  PROGBITS 0000000000000005 001005 000001
  44
  45 .section .text.foo0,"ax"
  46 ret
  47 .section .text.foo1,"ax"
  48 ret
  49 .section .text.bar0,"ax"
  50 ret
  51 .section .text.bar1,"ax"
  52 ret