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The ELF spec says: > STT_FILE: Conventionally, the symbol's name gives the name of the source file associated with the object file. A file symbol has STB_LOCAL binding, its section index is SHN_ABS, and it precedes the other STB_LOCAL symbols for the file, if it is present. For a local symbol, the preceding STT_FILE symbol is almost always in the same file[1]. GNU addr2line uses this heuristic to retrieve the filename associated with a local symbol (e.g. internal linkage functions in C/C++). GNU addr2line can assign STT_FILE filename to a non-local symbol, too, but the trick only works if no regular symbol precede STT_FILE. This patch does not implement this corner case (not useful for most executables which have more than one files). In case of filename mismatch between .debug_line & .symtab, arbitrarily make .debug_line win. [1]: LLD does not synthesize STT_FILE symbols (https://bugs.llvm.org/show_bug.cgi?id=48023 see also https://sourceware.org/bugzilla/show_bug.cgi?id=26822). An assembly file without `.file` directives can cause mis-attribution. This is an edge case. Differential Revision: https://reviews.llvm.org/D95927
21 lines
432 B
ArmAsm
21 lines
432 B
ArmAsm
# REQUIRES: x86-registered-target
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## Ignore STT_SECTION and STT_TLS symbols for .symtab symbolization.
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# RUN: llvm-mc -filetype=obj -triple=x86_64 %s -o %t
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# RUN: llvm-symbolizer --obj=%t 0 | FileCheck %s
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# CHECK: b
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# CHECK-NEXT: 1.c:0:0
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# CHECK-EMPTY:
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.file "1.c"
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.section a,"a",@progbits
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b:
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.reloc ., R_X86_64_NONE, a
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.section c,"a",@progbits
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.reloc ., R_X86_64_NONE, c
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.section .tbss,"awT",@nobits
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.globl tls
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tls:
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