derek.holloway
7502bf64a4
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69 lines
1.7 KiB
ArmAsm
69 lines
1.7 KiB
ArmAsm
## This reproduces a bug with jump table identification where jump table has
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## entries pointing to code in function and its cold fragment.
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# REQUIRES: system-linux
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# RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown %s -o %t.o
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# RUN: llvm-strip --strip-unneeded %t.o
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# RUN: %clang %cflags %t.o -o %t.exe -Wl,-q
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# RUN: llvm-bolt %t.exe -o %t.out --lite=0 -v=1 --print-cfg --print-only=main \
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# RUN: 2>&1 | FileCheck %s
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# CHECK-NOT: unclaimed PC-relative relocations left in data
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# CHECK: BOLT-INFO: marking main.cold.1 as a fragment of main
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.text
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.globl main
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.type main, %function
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.p2align 2
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main:
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LBB0:
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andl $0xf, %ecx
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cmpb $0x4, %cl
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## exit through abort in main.cold.1, registers cold fragment the regular way
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ja main.cold.1
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## jump table dispatch, jumping to label indexed by val in %ecx
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LBB1:
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leaq JUMP_TABLE(%rip), %r8
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movzbl %cl, %ecx
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movslq (%r8,%rcx,4), %rax
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addq %rax, %r8
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jmpq *%r8
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LBB2:
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xorq %rax, %rax
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LBB3:
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addq $0x8, %rsp
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ret
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.size main, .-main
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## Insert padding between functions, so that the next instruction cannot be
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## treated as __builtin_unreachable destination for the jump table.
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.quad 0
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.globl main.cold.1
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.type main.cold.1, %function
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.p2align 2
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main.cold.1:
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LBB4:
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callq abort
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.size main.cold.1, .-main.cold.1
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.rodata
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## jmp table, entries must be R_X86_64_PC32 relocs
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.globl JUMP_TABLE
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JUMP_TABLE:
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.long LBB2-JUMP_TABLE
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.long LBB3-JUMP_TABLE
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.long LBB4-JUMP_TABLE
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.long LBB3-JUMP_TABLE
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## Verify that the entry corresponding to the cold fragment was added to
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## the jump table.
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# CHECK: PIC Jump table
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# CHECK-NEXT: 0x{{.*}} :
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# CHECK-NEXT: 0x{{.*}} :
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# CHECK-NEXT: 0x{{.*}} : main.cold.1
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# CHECK-NEXT: 0x{{.*}} :
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