## This reproduces a bug with jump table identification where jump table has ## entries pointing to code in function and its cold fragment. # REQUIRES: system-linux # RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown %s -o %t.o # RUN: llvm-strip --strip-unneeded %t.o # RUN: %clang %cflags %t.o -o %t.exe -Wl,-q # RUN: llvm-bolt %t.exe -o %t.out --lite=0 -v=1 --print-cfg --print-only=main \ # RUN: 2>&1 | FileCheck %s # CHECK-NOT: unclaimed PC-relative relocations left in data # CHECK: BOLT-INFO: marking main.cold.1 as a fragment of main .text .globl main .type main, %function .p2align 2 main: LBB0: andl $0xf, %ecx cmpb $0x4, %cl ## exit through abort in main.cold.1, registers cold fragment the regular way ja main.cold.1 ## jump table dispatch, jumping to label indexed by val in %ecx LBB1: leaq JUMP_TABLE(%rip), %r8 movzbl %cl, %ecx movslq (%r8,%rcx,4), %rax addq %rax, %r8 jmpq *%r8 LBB2: xorq %rax, %rax LBB3: addq $0x8, %rsp ret .size main, .-main ## Insert padding between functions, so that the next instruction cannot be ## treated as __builtin_unreachable destination for the jump table. .quad 0 .globl main.cold.1 .type main.cold.1, %function .p2align 2 main.cold.1: LBB4: callq abort .size main.cold.1, .-main.cold.1 .rodata ## jmp table, entries must be R_X86_64_PC32 relocs .globl JUMP_TABLE JUMP_TABLE: .long LBB2-JUMP_TABLE .long LBB3-JUMP_TABLE .long LBB4-JUMP_TABLE .long LBB3-JUMP_TABLE ## Verify that the entry corresponding to the cold fragment was added to ## the jump table. # CHECK: PIC Jump table # CHECK-NEXT: 0x{{.*}} : # CHECK-NEXT: 0x{{.*}} : # CHECK-NEXT: 0x{{.*}} : main.cold.1 # CHECK-NEXT: 0x{{.*}} :