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JJenkxandClaude Opus 5.5
59693ae54c
The Windows samplers (APS5_SAMPLE_WORKER, APS5_SAMPLE_COMMITTER and
APS5_SAMPLE_THREADS) write every frame as module+0xRVA, and BUILD.md left
naming them to the reader ("for example with nm on the .prx"). Doing that
by hand means finding each module's image base, choosing between COFF
symbols and the export table, and keeping the files cumulative totals in
mind.
tools/symbolize_samples.py reads a collapsed-stack file or the address
file, opens each module it finds in --libs as a PE32+ image, and names
every frame module!function:
- From the COFF symbol table that the MinGW-built .prx and .dll keep:
external and static symbols in code sections, at the section's RVA
plus the symbol value. Addresses outside a code section, or before the
first symbol, stay module+0xRVA.
- From the export table, prefixed with "~", for a module without
symbols, such as the runtime DLLs.
- A module whose SizeOfImage or TimeDateStamp differs from the sampler's
"# module" line is left unsymbolized, with a warning: its addresses
would name the wrong functions.
--since subtracts an earlier copy of the same file, which keeps only the
samples taken between the two copies (the files hold totals since
start-up). --out writes the named stacks for speedscope or flamegraph.pl.
--demangle uses c++filt when it is on PATH. It needs no binutils
otherwise.
test_symbolize_samples (registered with CTest) builds small PE32+ images
with COFF symbols and with an export table, and covers short, string-table
and static names, the ignored section and data symbols, addresses outside
code, the export fallback, the size and timestamp check, --since with
--out, the address-file format and rejected lines.
Co-Authored-By: Claude Opus 5.5 <[email protected]>