lld/test/MachO/compact-unwind-stack-ind.s

   1 # REQUIRES: x86
   2 # RUN: llvm-mc -filetype=obj -triple=x86_64-apple-darwin19.0.0 -emit-compact-unwind-non-canonical=true %s -o %t.o
   3 # RUN: %lld -arch x86_64 -dylib %t.o -o %t.dylib
   4 # RUN: llvm-objdump --macho --syms --unwind-info %t.dylib | FileCheck %s
   5
   6 ## Both _f and _g have the same compact unwind encoding,
   7 ## but different stack sizes. So their compact unwindings
   8 ## can't be merged.
   9 # CHECK:  SYMBOL TABLE:
  10 # CHECK:  [[#%x,F:]] g  F __TEXT,__text _f
  11 # CHECK:  [[#%x,G:]] g  F __TEXT,__text _g
  12 # CHECK: Number of common encodings in array:       0x1
  13 # CHECK:  Common encodings: (count = 1)
  14 # CHECK:    encoding[0]: 0x03032000
  15 # CHECK:  Second level indices:
  16 # CHECK:    Second level index[0]:
  17 # CHECK:      [0]: function offset=0x[[#%.8x,F]], encoding[0]=0x03032000
  18 # CHECK:      [1]: function offset=0x[[#%.8x,G]], encoding[0]=0x03032000
  19
  20 ## Based on compiling
  21 ##     int f() {
  22 ##       char alloca[3260] = { 0 };
  23 ##       return alloca[0];
  24 ##     }
  25 ##
  26 ##     int g() {
  27 ##       char alloca[2560] = { 0 };
  28 ##       return alloca[0];
  29 ##     }
  30 ## with `-fomit-frame-pointer -fno-stack-protector -S`.
  31 .section __TEXT,__text,regular,pure_instructions
  32 .build_version macos, 10, 15 sdk_version 10, 15, 6
  33
  34 .globl _f
  35 .p2align 4, 0x90
  36 _f:
  37   .cfi_startproc
  38   subq $3272, %rsp
  39   .cfi_def_cfa_offset 3280
  40   addq $3272, %rsp
  41   retq
  42   .cfi_endproc
  43
  44 .globl _g
  45 .p2align 4, 0x90
  46 _g:
  47   .cfi_startproc
  48   subq $2568, %rsp
  49   .cfi_def_cfa_offset 2576
  50   addq $2568, %rsp
  51   retq
  52   .cfi_endproc
  53
  54 .subsections_via_symbols