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When BOLT updates .eh_frame section, it concatenates newly-generated contents (from CFI directives) with the original .eh_frame that has relocations applied to it. However, if no new content is generated, the original .eh_frame has to be left intact. In that case, BOLT was still writing out the relocatable copy of the original .eh_frame section to the new segment, even though this copy was never used and was not even marked in the section header table. Detect the scenario above and skip allocating extra space for .eh_frame. Reviewed By: rafauler Differential Revision: https://reviews.llvm.org/D135223
28 lines
775 B
ArmAsm
28 lines
775 B
ArmAsm
# REQUIRES: system-linux
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# RUN: llvm-mc -filetype=obj -triple x86_64-unknown-linux %s -o %t.o
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# RUN: ld.lld %t.o -o %t.exe -q
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# RUN: llvm-bolt %t.exe -o %t.bolt.exe --funcs=nocfi_function
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# RUN: llvm-readelf --section-headers %t.bolt.exe | FileCheck %s
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## Check that llvm-bolt does not allocate unmarked space for original .eh_frame
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## after .text when no update is needed to .eh_frame.
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# CHECK: {{ .text}} PROGBITS [[#%x,ADDR:]] [[#%x,OFFSET:]] [[#%x,SIZE:]]
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# CHECK-NEXT: 0000000000000000 [[#%x, OFFSET + SIZE]]
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.text
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.globl nocfi_function
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.type nocfi_function,@function
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nocfi_function:
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ret
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.size nocfi_function, .-nocfi_function
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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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call nocfi_function
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.size _start, .-_start
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.cfi_endproc
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