derek.holloway
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92 lines
2.1 KiB
ArmAsm
92 lines
2.1 KiB
ArmAsm
# In this test case, the symbol that represents the end of a table
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# in .rodata is being colocated with the start of a jump table from
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# another function, and BOLT moves that jump table. This should not
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# cause the symbol representing the end of the table to be moved as
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# well.
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# Bug reported in https://github.com/llvm/llvm-project/issues/55004
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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 -no-pie -nostartfiles -nostdlib -lc %t.o -o %t.exe -Wl,-q
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# RUN: llvm-bolt %t.exe -o %t.exe.bolt --relocs=1 --lite=0 \
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# RUN: --reorder-blocks=reverse -jump-tables=move
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# RUN: %t.exe.bolt 1 2 3
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.file "jt-symbol-disambiguation.s"
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.text
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# ----
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# Func foo contains a jump table whose start is colocated with a
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# symbol marking the end of a data table
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# ----
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.globl foo
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.type foo, @function
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foo:
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.cfi_startproc
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xor %rax,%rax
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and $0x3,%rdi
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leaq .JT1(%rip), %rax
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movslq (%rax, %rdi, 4), %rdi
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addq %rax, %rdi
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jmpq *%rdi
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.LBB1:
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movl $0x1,%eax
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jmp .LBB5
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.LBB2:
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movl $0x2,%eax
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jmp .LBB5
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.LBB3:
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movl $0x3,%eax
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jmp .LBB5
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.LBB4:
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movl $0x4,%eax
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.LBB5:
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retq
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.cfi_endproc
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.size foo, .-foo
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# ----
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# Func _start scans a table using begin/end pointers. End pointer is colocated
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# with the start of a jump table of function foo. When that jump
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# table moves, end pointer in _start should not be affected.
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# ----
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.globl _start
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.type _start, @function
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_start:
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.cfi_startproc
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movq (%rsp), %rdi
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callq foo
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leaq .start_of_table(%rip), %rsi # iterator
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leaq .end_of_table(%rip), %rdi # iterator end
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.LBB6:
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cmpq %rsi, %rdi
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je .LBB7
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movq (%rsi), %rbx
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leaq 8(%rsi), %rsi # ++iterator
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jmp .LBB6
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.LBB7:
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xor %rdi, %rdi
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callq exit@PLT
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.cfi_endproc
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.size _start, .-_start
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# ----
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# Data section
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# ----
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.section .rodata,"a",@progbits
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.p2align 3
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.start_of_table:
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.quad 123
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.quad 456
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.quad 789
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.end_of_table:
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.JT1:
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.long .LBB1 - .JT1
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.long .LBB2 - .JT1
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.long .LBB3 - .JT1
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.long .LBB4 - .JT1
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