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

# This test ensures that "unclaimed" jump table entries are accounted later
# in postProcessIndirectBranches and the function is marked as non-simple.

# The test is compiled from the following source using GCC 12.2 -O3:
# https://godbolt.org/z/YcPG131s6
# int func(long long Input) {
#   switch(Input) {
#   case 3: return 1;
#   case 4: return 2;
#   case 6: return 3;
#   case 8: return 4;
#   case 13: return 5;
#   default: __builtin_unreachable();
#   }
# }

# REQUIRES: system-linux

# RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown %s -o %t.o
# RUN: %clang %cflags %S/Inputs/unclaimed-jt-entries.c -no-pie %t.o -o %t.exe -Wl,-q
# RUN: llvm-bolt %t.exe -v=1 -o %t.out --sequential-disassembly |& FileCheck %s

# CHECK: BOLT-WARNING: unclaimed data to code reference (possibly an unrecognized jump table entry) to .Ltmp[[#]] in func
# CHECK: BOLT-WARNING: unclaimed data to code reference (possibly an unrecognized jump table entry) to .Ltmp[[#]] in func
# CHECK: BOLT-WARNING: unclaimed data to code reference (possibly an unrecognized jump table entry) to .Ltmp[[#]] in func
# CHECK: BOLT-WARNING: unclaimed data to code reference (possibly an unrecognized jump table entry) to .Ltmp[[#]] in func
# CHECK: BOLT-WARNING: unclaimed data to code reference (possibly an unrecognized jump table entry) to .Ltmp[[#]] in func
# CHECK: BOLT-WARNING: failed to post-process indirect branches for func

# Run the optimized binary
# RUN: %t.out 3 | FileCheck %s --check-prefix=CHECK3
# CHECK3: 1
# RUN: %t.out 4 | FileCheck %s --check-prefix=CHECK4
# CHECK4: 2
# RUN: %t.out 6 | FileCheck %s --check-prefix=CHECK6
# CHECK6: 3
# RUN: %t.out 8 | FileCheck %s --check-prefix=CHECK8
# CHECK8: 4
# RUN: %t.out 13 | FileCheck %s --check-prefix=CHECK13
# CHECK13: 5

  .text
  .globl func
  .type func, %function
  .size func, .Lend-func
func:
  jmp *L4-24(,%rdi,8)
.L5:
  movl $4, %eax
  ret
.L9:
  movl $2, %eax
  ret
.L8:
  movl $1, %eax
  ret
.L3:
  movl $5, %eax
  ret
.L6:
  movl $3, %eax
  ret
.Lend:

.section .rodata
  .globl L4
L4:
  .quad .L8
  .quad .L9
  .quad .L3
  .quad .L6
  .quad .L3
  .quad .L5
  .quad .L3
  .quad .L3
  .quad .L3
  .quad .L3
  .quad .L3