bolt/test/X86/unclaimed-jt-entries.s

   1 # This test ensures that "unclaimed" jump table entries are accounted later
   2 # in postProcessIndirectBranches and the function is marked as non-simple.
   3
   4 # The test is compiled from the following source using GCC 12.2 -O3:
   5 # https://godbolt.org/z/YcPG131s6
   6 # int func(long long Input) {
   7 #   switch(Input) {
   8 #   case 3: return 1;
   9 #   case 4: return 2;
  10 #   case 6: return 3;
  11 #   case 8: return 4;
  12 #   case 13: return 5;
  13 #   default: __builtin_unreachable();
  14 #   }
  15 # }
  16
  17 # REQUIRES: system-linux
  18
  19 # RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown %s -o %t.o
  20 # RUN: %clang %cflags -no-pie %t.o -o %t.exe -Wl,-q
  21 # RUN: llvm-bolt %t.exe -v=1 -o %t.out |& FileCheck %s
  22
  23 # CHECK: BOLT-WARNING: unclaimed data to code reference (possibly an unrecognized jump table entry) to .Ltmp[[#]] in main
  24 # CHECK: BOLT-WARNING: unclaimed data to code reference (possibly an unrecognized jump table entry) to .Ltmp[[#]] in main
  25 # CHECK: BOLT-WARNING: unclaimed data to code reference (possibly an unrecognized jump table entry) to .Ltmp[[#]] in main
  26 # CHECK: BOLT-WARNING: unclaimed data to code reference (possibly an unrecognized jump table entry) to .Ltmp[[#]] in main
  27 # CHECK: BOLT-WARNING: unclaimed data to code reference (possibly an unrecognized jump table entry) to .Ltmp[[#]] in main
  28 # CHECK: BOLT-WARNING: failed to post-process indirect branches for main
  29
  30   .text
  31   .globl main
  32   .type main, %function
  33   .size main, .Lend-main
  34 main:
  35   jmp *L4-24(,%rdi,8)
  36 .L5:
  37   movl $4, %eax
  38   ret
  39 .L9:
  40   movl $2, %eax
  41   ret
  42 .L8:
  43   movl $1, %eax
  44   ret
  45 .L3:
  46   movl $5, %eax
  47   ret
  48 .L6:
  49   movl $3, %eax
  50   ret
  51 .Lend:
  52
  53 .section .rodata
  54   .globl L4
  55 L4:
  56   .quad .L8
  57   .quad .L9
  58   .quad .L3
  59   .quad .L6
  60   .quad .L3
  61   .quad .L5
  62   .quad .L3
  63   .quad .L3
  64   .quad .L3
  65   .quad .L3
  66   .quad .L3