db9da5d184AIX export files support the `weak` keyword to mark weak symbols. This helps preserve C++ weak symbol semantics and preventing potential linker conflicts. PR-URL: https://github.com/nodejs/node/pull/62656 Refs: https://www.ibm.com/docs/en/aix/7.2.0?topic=l-ld-command#ld__a3119106d Reviewed-By: Richard Lau <richard.lau@ibm.com> Reviewed-By: Michaël Zasso <targos@protonmail.com>
87 lines
3.6 KiB
Bash
Executable file
87 lines
3.6 KiB
Bash
Executable file
#!/bin/sh
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# Writes out all of the exported symbols to a file.
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# This is needed on AIX as symbols are not exported
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# by an executable by default and need to be listed
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# specifically for export so that they can be used
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# by native add-ons.
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#
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# The raw symbol data is obtained by using dump -tov on
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# the .a files which make up the node executable.
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#
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# dump -tov flags:
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# -t: Display symbol table entries
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# -o: Display object file headers
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# -v: Display visibility information (HIDDEN/EXPORTED/PROTECTED)
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# -X 32_64: Process both 32-bit and 64-bit symbols
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#
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# This approach is similar to CMake's ExportImportList module for AIX:
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# https://github.com/Kitware/CMake/blob/45f4742cbfe6c25c7c801e3806c8af04a2c4b09b/Modules/Platform/AIX/ExportImportList#L67-L80
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#
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# We filter for symbols in .text, .data, .tdata, and .bss sections
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# with extern or weak linkage, excluding:
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# - Symbols starting with dot (internal/local symbols)
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# - __sinit/__sterm (static initialization/termination)
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# - __[0-9]+__ (compiler-generated symbols)
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# - HIDDEN visibility symbols (to avoid linker error 0711-407)
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#
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# The final sort allows removal of any duplicates.
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#
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# Symbols for the gtest libraries are excluded as
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# they are not linked into the node executable.
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#
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echo "Searching $1 to write out expfile to $2"
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# This special sequence must be at the start of the exp file.
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echo "#!." > "$2.tmp"
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# Pull the symbols from the .a files.
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# Use dump -tov to get visibility information and exclude HIDDEN symbols.
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# This prevents AIX linker error 0711-407 when addons try to import symbols
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# with visibility attributes.
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#
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# IMPORTANT: AIX dump -tov output has a visibility column that contains either
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# a visibility keyword (HIDDEN/EXPORTED/PROTECTED) or blank spaces when no
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# visibility attribute is set. Since AWK splits fields on whitespace, this
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# results in different field counts:
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#
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# With visibility keyword (8 fields after AWK splits):
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# [137] m 0x00003290 .text 1 weak HIDDEN ._ZNKSt3__1...
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# $1 $2 $3 $4 $5 $6 $7 $8
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# | | └─ Symbol name
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# | └─ Visibility (HIDDEN/EXPORTED/PROTECTED)
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# └─ Linkage (weak/extern)
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#
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# Without visibility keyword (7 fields after AWK splits, spaces collapsed):
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# [77] m 0x00000000 .text 1 weak ._ZN8simdjson...
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# $1 $2 $3 $4 $5 $6 $7
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# | └─ Symbol name
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# └─ Linkage (weak/extern)
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#
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# The awk script handles both cases by using an associative array V[]
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# to map field values to their export suffixes. For fields that don't match
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# any key in V[], the lookup returns an empty string, which is perfect for
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# handling the variable field positions caused by the blank visibility column.
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#
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find "$1" -name "*.a" | grep -v gtest | while read -r f; do
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dump -tov -X 32_64 "$f" 2>/dev/null | \
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awk '
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BEGIN {
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V["EXPORTED"]=" export"
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V["PROTECTED"]=" protected"
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V["HIDDEN"]=" hidden"
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V["weak"]=" weak"
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}
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/^\[[0-9]+\]\tm +[^ ]+ +\.(text|data|tdata|bss) +[^ ]+ +(extern|weak)( +(EXPORTED|PROTECTED|HIDDEN))?/ {
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# Exclude symbols starting with dot, __sinit, __sterm, __[0-9]+__
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# Also exclude HIDDEN symbols to avoid visibility attribute issues
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if (!match($NF,/^(\.|__sinit|__sterm|__[0-9]+__)/)) {
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# Skip if HIDDEN visibility (can be at $(NF-1) or $(NF-2))
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if ($(NF-1) != "HIDDEN" && $(NF-2) != "HIDDEN") {
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print $NF V[$(NF-1)] V[$(NF-2)]
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}
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}
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}
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'
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done | sort -u >> "$2.tmp"
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mv -f "$2.tmp" "$2"
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