forked from OSchip/llvm-project
60 lines
1.4 KiB
ArmAsm
60 lines
1.4 KiB
ArmAsm
# This reproduces a bug with jump table identification where jump table has
|
|
# entries pointing to code in function and its cold fragment.
|
|
# The fragment is only reachable through jump table.
|
|
|
|
# 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 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 ret
|
|
ja LBB3
|
|
|
|
# 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
|
|
|
|
# cold fragment is only reachable through jump table
|
|
.globl main.cold.1
|
|
.type main.cold.1, %function
|
|
.p2align 2
|
|
main.cold.1:
|
|
# load bearing nop: pad LBB4 so that it can't be treated
|
|
# as __builtin_unreachable by analyzeJumpTable
|
|
nop
|
|
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
|