lld/test/ELF/debug-dead-reloc-icf.s

   1 # REQUIRES: x86
   2 ## Test we resolve symbolic relocations in .debug_* sections to a tombstone
   3 ## value if the referenced section symbol is folded into another section by ICF.
   4 ## Otherwise, we would leave entries in multiple CUs claiming ownership of the
   5 ## same range of code, which can confuse consumers.
   6
   7 # RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t.o
   8 # RUN: ld.lld --icf=all %t.o -o %t
   9 # RUN: llvm-objdump -s %t | FileCheck %s
  10
  11 # CHECK:      Contents of section .debug_info:
  12 # CHECK-NEXT:  0000 {{[0-9a-f]+}}000 00000000 00000000 00000000
  13 # CHECK:      Contents of section .debug_line:
  14 # CHECK-NEXT:  0000 [[ADDR:[0-9a-f]+]] 00000000
  15 # CHECK-SAME:                                   [[ADDR]] 00000000
  16
  17 .globl _start
  18 _start:
  19   ret
  20
  21 ## .text.1 will be folded by ICF.
  22 .section .text.1,"ax"
  23   ret
  24
  25 .section .debug_info
  26   .quad .text+8
  27   .quad .text.1+8
  28
  29 ## .debug_line contributions associated with folded-in functions will describe
  30 ## different lines to the canonical function. Leaving a tombstone value would
  31 ## prevent users from setting breakpoints on the folded-in functions.
  32 ## Instead resolve the relocation to the folded .text.1 to .text
  33 .section .debug_line
  34   .quad .text
  35   .quad .text.1