b2559f2f5c
Linux Standard Base Core Specification says that CIE/FDE is padded to an addressing unit size boundary, but in practice GNU assembler/LLVM integrated assembler pad FDE/CIE to 4 and the last FDE to 8 on 64-bit systems. In addition, GNU ld doesn't pad to 8, so let's drop excess padding, too. If the assembler provides aligned pieces, the output will be aligned. Noticed .eh_frame size reduction for 3 executables: 0.3% (chrome), 4.7% (clang), 7.6% (an internal program).
51 lines
1.1 KiB
ArmAsm
51 lines
1.1 KiB
ArmAsm
# REQUIRES: x86
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# RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t.o
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# RUN: ld.lld --eh-frame-hdr -shared %t.o -o %t.so
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# RUN: llvm-dwarfdump --eh-frame %t.so | FileCheck %s
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# CHECK: 00000000 00000014 00000000 CIE
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# CHECK: Augmentation:
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# CHECK-SAME: "zR"
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# CHECK: 00000018 00000010 0000001c FDE cie=00000000 {{.*}}
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# CHECK: 0000002c 00000018 00000000 CIE
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# CHECK: Augmentation:
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# CHECK-SAME: "zPR"
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# CHECK: Personality Address:
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# CHECK: 00000048 00000010 00000020 FDE cie=0000002c {{.*}}
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# CHECK: 0000005c 00000018 00000000 CIE
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# CHECK: Augmentation:
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# CHECK-SAME: "zPR"
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# CHECK: Personality Address:
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# CHECK: 00000078 00000014 00000020 FDE cie=0000005c {{.*}}
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foo0:
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.cfi_startproc
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.cfi_personality 0x9b, personality0
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ret
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.cfi_endproc
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## This CIE cannot be merged into the previous one because the Personality is different.
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foo1:
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.cfi_startproc
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.cfi_personality 0x9b, personality1
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ret
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.cfi_endproc
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bar:
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.cfi_startproc
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ret
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.cfi_endproc
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.globl personality0, personality1
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.hidden personality0, personality1
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personality0:
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ret
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personality1:
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ret
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