1## This reproduces a bug with jump table identification where jump table has 2## entries pointing to code in function and its cold fragment. 3## The fragment is only reachable through jump table. 4 5# REQUIRES: system-linux 6 7# RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown %s -o %t.o 8# RUN: llvm-strip --strip-unneeded %t.o 9# RUN: %clang %cflags %t.o -o %t.exe -Wl,-q 10# RUN: llvm-bolt %t.exe -o %t.out --lite=0 -v=1 2>&1 | FileCheck %s 11 12# CHECK-NOT: unclaimed PC-relative relocations left in data 13# CHECK: BOLT-INFO: marking main.cold.1 as a fragment of main 14 .text 15 .globl main 16 .type main, %function 17 .p2align 2 18main: 19LBB0: 20 andl $0xf, %ecx 21 cmpb $0x4, %cl 22 ## exit through ret 23 ja LBB3 24 25## jump table dispatch, jumping to label indexed by val in %ecx 26LBB1: 27 leaq JUMP_TABLE(%rip), %r8 28 movzbl %cl, %ecx 29 movslq (%r8,%rcx,4), %rax 30 addq %rax, %r8 31 jmpq *%r8 32 33LBB2: 34 xorq %rax, %rax 35LBB3: 36 addq $0x8, %rsp 37 ret 38.size main, .-main 39 40## cold fragment is only reachable through jump table 41 .globl main.cold.1 42 .type main.cold.1, %function 43 .p2align 2 44main.cold.1: 45 ## load bearing nop: pad LBB4 so that it can't be treated 46 ## as __builtin_unreachable by analyzeJumpTable 47 nop 48LBB4: 49 callq abort 50.size main.cold.1, .-main.cold.1 51 52 .rodata 53## jmp table, entries must be R_X86_64_PC32 relocs 54 .globl JUMP_TABLE 55JUMP_TABLE: 56 .long LBB2-JUMP_TABLE 57 .long LBB3-JUMP_TABLE 58 .long LBB4-JUMP_TABLE 59 .long LBB3-JUMP_TABLE 60