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windows: qualify debuggers and host shells (R12; depends on xgo-dev/llgo#2463) - #216

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cpunion wants to merge 25 commits into
codex/windows-r11-mingw-arch-upstream-20260831from
codex/windows-r12-debug-shell-20260831
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windows: qualify debuggers and host shells (R12; depends on xgo-dev/llgo#2463)#216
cpunion wants to merge 25 commits into
codex/windows-r11-mingw-arch-upstream-20260831from
codex/windows-r12-debug-shell-20260831

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@cpunion

@cpunion cpunion commented Aug 30, 2026 •
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Purpose

Advance R12 of the Windows support proposal by qualifying debugger metadata and native host-shell invocation across the supported Windows profiles and architectures.

Related proposal: xgo-dev#2325

Depends on:

Current scope

  • extract and use the official target-native LLVM 19.1.7 LLDB installations for Windows/ARM64 and Windows/386 instead of asking the x64 debugger to cross architecture-specific exception dispatch;
  • pair those debuggers with their actual embedded Python ABIs (3.11 ARM64 and 3.10 x86), independently of the Python 3.12 demo target;
  • run LLDB integration on MSVC and MinGW for amd64, ARM64, and 386;
  • honor the configured LLGO_LLDB before probing PATH, so a cross-architecture lane cannot silently select the host debugger;
  • select the resolved source frame before evaluating variables, because Windows/386 can expose the WoW64 exception dispatcher as frame zero;
  • keep 64-bit integer debug values addressable on Windows/386 so LLVM cannot truncate an unsigned value to one 32-bit DWARF stack item;
  • preserve DWARF for package C/C++ sources whenever the typed Go debug policy preserves it, with no debug metadata added to normal -w or default release builds;
  • verify source breakpoints and ordered mixed Go -> C -> Go callback stacks, including a C nil-fault instruction reached through a callback boundary;
  • isolate the mixed-language stack fixture from the large variable-formatting fixture so foreign calls cannot perturb unrelated Go variable locations;
  • parse, verify, and semantically inspect LLGo DWARF in PE files at every optimization level;
  • retain the verifier fixture's COFF sections for both MSVC and MinGW, avoiding zero-address section-GC tombstones that llvm-dwarfdump --verify misdiagnoses while normal LLDB tests continue to exercise section GC;
  • preserve an explicit COFF /debug linker choice and emit CodeView file/line records for the companion PDB while retaining embedded DWARF;
  • verify that the PDB contains Go source files, Go public symbols, and usable line/address mappings;
  • run profile-preserving builds from PowerShell, cmd.exe, a fresh Visual Studio Developer Shell, MSYS2, and Cygwin;
  • keep shell scripts LF-terminated in Windows checkouts so the same checked-in host-shell qualification runs under MSYS2 and Cygwin;
  • reject accidental msys-2.0.dll, cygwin1.dll, and, for MSVC, libwinpthread dependencies in shell-produced executables.

The explicit-PDB path does not introduce a second Go type system in CodeView. The companion PDB provides discovery, public symbols, and source/line mappings; embedded DWARF remains the type authority. Default release builds and explicit /debug:none builds do not emit the extra metadata.

Validation

  • rebased without conflicts onto R11 head 14aedcde5; range-diff confirms all 25 R12 commits are unchanged apart from their rewritten parents;
  • the host-shell fix preserves architecture-selected compilers for non-amd64 targets and passes native Windows output/inspection paths explicitly from Cygwin, which unlike MSYS2 does not translate native-program arguments; no speculative DLL-path override remains;
  • go test -count=1 ./test/go ./ssa ./internal/build ./internal/debuginfo passes on macOS ARM64 (internal/build completed in 446s);
  • Windows/386 MSVC with official Win32 LLDB 19.1.7: 224/224 variable assertions and 3/3 mixed Go/C callback/fault-stack assertions pass, including all auxiliary marker/plugin checks;
  • Windows/386 MinGW with official Win32 LLDB 19.1.7: the same 224/224, 3/3, and auxiliary checks pass;
  • the MinGW/386 suite also passes with the host lldb first on PATH and the target-native debugger selected only through LLGO_LLDB;
  • Windows/ARM64 MinGW with native Go 1.27 and CLANGARM64 22.1.8: the complete test/go package passes with LLGO_TEST_JOBS=1;
  • Windows/amd64 MSVC TestStandardDWARF passes at O0, O1, O2, O3, Os, and Oz;
  • Python bytecode validation, YAML parsing, actionlint, and git diff --check pass;
  • the complete Windows architecture/profile CI matrix is running on the current head.

@cpunion cpunion added the windows Windows platform support label Aug 30, 2026
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github-actions Bot commented Aug 30, 2026 •
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LLGo baseline benchmarks

5ce14445e7b8 | workflow run | long-term charts

Program measurements

Platform Workload File size vs base Text size vs base Build vs base Run vs base
Linux cprintf 19608 B 0 B / +0.0% 387 B 0 B / +0.0% 356.348 ms +8.321 ms / +2.4% (worse) 1.339 ms +92.18 us / +7.4% (worse)
Linux cprintf-lto 19440 B 0 B / +0.0% 368 B 0 B / +0.0% 357.500 ms -2.371 ms / -0.7% (better) 1.275 ms -68.15 us / -5.1% (better)
Linux fmtprintf 1615576 B 0 B / +0.0% 493418 B 0 B / +0.0% 2.534 s +26.67 ms / +1.1% (worse) 3.034 ms +12.78 us / +0.4% (worse)
Linux fmtprintf-lto 1491368 B 0 B / +0.0% 453936 B 0 B / +0.0% 8.336 s -89.4 ms / -1.1% (better) 2.924 ms -256.6 us / -8.1% (better)
Linux println 62808 B 0 B / +0.0% 15360 B 0 B / +0.0% 349.342 ms +2.191 ms / +0.6% (worse) 1.689 ms +9.758 us / +0.6% (worse)
Linux println-lto 54648 B 0 B / +0.0% 12985 B 0 B / +0.0% 528.047 ms +3.527 ms / +0.7% (worse) 1.726 ms +82.03 us / +5.0% (worse)
macOS cprintf 84480 B 0 B / +0.0% 16845 B 0 B / +0.0% 375.460 ms -161.4 ms / -30.1% (better) 2.506 ms -161.3 us / -6.0% (better)
macOS cprintf-lto 100704 B 0 B / +0.0% 16825 B 0 B / +0.0% 415.988 ms -193 ms / -31.7% (better) 2.595 ms -164.6 us / -6.0% (better)
macOS fmtprintf 1473136 B 0 B / +0.0% 869200 B 0 B / +0.0% 2.045 s -1.375 s / -40.2% (better) 4.112 ms -1.189 ms / -22.4% (better)
macOS fmtprintf-lto 1176000 B 0 B / +0.0% 864760 B 0 B / +0.0% 6.323 s -301.2 ms / -4.5% (better) 4.685 ms -2.073 ms / -30.7% (better)
macOS println 114944 B 0 B / +0.0% 35377 B 0 B / +0.0% 371.122 ms -128.6 ms / -25.7% (better) 2.901 ms -917.5 us / -24.0% (better)
macOS println-lto 118736 B 0 B / +0.0% 33029 B 0 B / +0.0% 481.634 ms -330.5 ms / -40.7% (better) 3.382 ms -507.9 us / -13.1% (better)
Windows MinGW cprintf 20480 B 0 B / +0.0% 4662 B 0 B / +0.0% 867.966 ms +26.93 ms / +3.2% (worse) 3.365 ms -48.5 us / -1.4% (better)
Windows MinGW cprintf-lto 18432 B 0 B / +0.0% 4582 B 0 B / +0.0% 889.217 ms +2.683 ms / +0.3% (worse) 3.525 ms -54.1 us / -1.5% (better)
Windows MinGW fmtprintf 1932800 B 0 B / +0.0% 597574 B 0 B / +0.0% 3.582 s +15.41 ms / +0.4% (worse) 8.197 ms +276.8 us / +3.5% (worse)
Windows MinGW fmtprintf-lto 1982464 B 0 B / +0.0% 589622 B 0 B / +0.0% 9.773 s +134.2 ms / +1.4% (worse) 8.543 ms +472 us / +5.8% (worse)
Windows MinGW println 74240 B 0 B / +0.0% 25014 B 0 B / +0.0% 870.191 ms -6.034 ms / -0.7% (better) 6.700 ms -792.7 us / -10.6% (better)
Windows MinGW println-lto 67584 B 0 B / +0.0% 21830 B 0 B / +0.0% 1.074 s -37.76 ms / -3.4% (better) 6.813 ms +20.3 us / +0.3% (worse)
Windows MinGW 386 cprintf 37888 B 0 B / +0.0% 5228 B 0 B / +0.0% 890.784 ms -63.5 ms / -6.7% (better) 5.013 ms -525.5 us / -9.5% (better)
Windows MinGW 386 cprintf-lto 21504 B 0 B / +0.0% 5028 B 0 B / +0.0% 920.100 ms -63.25 ms / -6.4% (better) 4.994 ms -134.2 us / -2.6% (better)
Windows MinGW 386 fmtprintf 1947136 B 0 B / +0.0% 472062 B 0 B / +0.0% 3.568 s -180.5 ms / -4.8% (better) 12.172 ms -92.8 us / -0.8% (better)
Windows MinGW 386 fmtprintf-lto 2188288 B 0 B / +0.0% 472002 B 0 B / +0.0% 10.193 s -704.9 ms / -6.5% (better) 10.939 ms -1.184 ms / -9.8% (better)
Windows MinGW 386 println 88064 B 0 B / +0.0% 20726 B 0 B / +0.0% 878.525 ms -58.97 ms / -6.3% (better) 8.441 ms -1.782 ms / -17.4% (better)
Windows MinGW 386 println-lto 72192 B 0 B / +0.0% 18790 B 0 B / +0.0% 1.117 s -84.65 ms / -7.0% (better) 8.479 ms -592.5 us / -6.5% (better)
Windows MinGW ARM64 cprintf 19968 B 0 B / +0.0% 4632 B 0 B / +0.0% 994.459 ms -27.4 ms / -2.7% (better) 6.093 ms -1.254 ms / -17.1% (better)
Windows MinGW ARM64 cprintf-lto 18432 B 0 B / +0.0% 4552 B 0 B / +0.0% 1.028 s -23.98 ms / -2.3% (better) 6.414 ms -64.8 us / -1.0% (better)
Windows MinGW ARM64 fmtprintf 1820160 B 0 B / +0.0% 510596 B 0 B / +0.0% 3.552 s +122.4 ms / +3.6% (worse) 14.141 ms +1.566 ms / +12.5% (worse)
Windows MinGW ARM64 fmtprintf-lto 1886720 B 0 B / +0.0% 506320 B 0 B / +0.0% 8.698 s -61.77 ms / -0.7% (better) 12.812 ms -632.9 us / -4.7% (better)
Windows MinGW ARM64 println 71680 B 0 B / +0.0% 23832 B 0 B / +0.0% 984.448 ms -26.85 ms / -2.7% (better) 11.211 ms -57.4 us / -0.5% (better)
Windows MinGW ARM64 println-lto 67072 B 0 B / +0.0% 21068 B 0 B / +0.0% 1.166 s -47.91 ms / -3.9% (better) 11.408 ms -285.3 us / -2.4% (better)
Windows MSVC cprintf 12288 B 0 B / +0.0% 4438 B 0 B / +0.0% 767.110 ms +148.9 ms / +24.1% (worse) 4.152 ms -230.1 us / -5.3% (better)
Windows MSVC cprintf-lto 11776 B 0 B / +0.0% 4278 B 0 B / +0.0% 751.976 ms +63.45 ms / +9.2% (worse) 3.601 ms +47.4 us / +1.3% (worse)
Windows MSVC fmtprintf 1471488 B 0 B / +0.0% 597142 B 0 B / +0.0% 2.830 s -34.77 ms / -1.2% (better) 8.494 ms +378.8 us / +4.7% (worse)
Windows MSVC fmtprintf-lto 1517056 B 0 B / +0.0% 596502 B 0 B / +0.0% 8.411 s +79.96 ms / +1.0% (worse) 8.735 ms +137.2 us / +1.6% (worse)
Windows MSVC println 47104 B 0 B / +0.0% 25030 B 0 B / +0.0% 652.750 ms +35.67 ms / +5.8% (worse) 6.681 ms +247.8 us / +3.9% (worse)
Windows MSVC println-lto 44032 B 0 B / +0.0% 22198 B 0 B / +0.0% 804.147 ms -19.16 ms / -2.3% (better) 6.715 ms +346.9 us / +5.4% (worse)
Windows MSVC 386 cprintf 9728 B 0 B / +0.0% 3930 B 0 B / +0.0% 896.692 ms +48.39 ms / +5.7% (worse) 5.717 ms -67.9 us / -1.2% (better)
Windows MSVC 386 cprintf-lto 9216 B 0 B / +0.0% 3840 B 0 B / +0.0% 918.634 ms +53.15 ms / +6.1% (worse) 5.454 ms -516.5 us / -8.7% (better)
Windows MSVC 386 fmtprintf 1189888 B 0 B / +0.0% 456032 B 0 B / +0.0% 3.554 s -16.98 ms / -0.5% (better) 12.680 ms +1.04 ms / +8.9% (worse)
Windows MSVC 386 fmtprintf-lto 1252352 B 0 B / +0.0% 452437 B 0 B / +0.0% 10.214 s +139.8 ms / +1.4% (worse) 11.133 ms -293.2 us / -2.6% (better)
Windows MSVC 386 println 35328 B 0 B / +0.0% 19712 B 0 B / +0.0% 851.232 ms +14.78 ms / +1.8% (worse) 9.129 ms -41.6 us / -0.5% (better)
Windows MSVC 386 println-lto 34304 B 0 B / +0.0% 17927 B 0 B / +0.0% 1.073 s -9.456 ms / -0.9% (better) 9.103 ms -231.4 us / -2.5% (better)
Windows MSVC ARM64 cprintf 11264 B 0 B / +0.0% 3976 B 0 B / +0.0% 1.812 s +25.16 ms / +1.4% (worse) 8.351 ms +10.9 us / +0.1% (worse)
Windows MSVC ARM64 cprintf-lto 10752 B 0 B / +0.0% 3844 B 0 B / +0.0% 1.816 s +31.38 ms / +1.8% (worse) 7.493 ms -23.9 us / -0.3% (better)
Windows MSVC ARM64 fmtprintf 1365504 B 0 B / +0.0% 510268 B 0 B / +0.0% 6.015 s +8.718 ms / +0.1% (worse) 16.221 ms -8.3 us / -0.1% (better)
Windows MSVC ARM64 fmtprintf-lto 1413120 B 0 B / +0.0% 507148 B 0 B / +0.0% 18.314 s +91.77 ms / +0.5% (worse) 16.415 ms +476.8 us / +3.0% (worse)
Windows MSVC ARM64 println 43008 B 0 B / +0.0% 22824 B 0 B / +0.0% 1.771 s +23.57 ms / +1.3% (worse) 13.343 ms -317.9 us / -2.3% (better)
Windows MSVC ARM64 println-lto 40960 B 0 B / +0.0% 20732 B 0 B / +0.0% 2.206 s -9.145 ms / -0.4% (better) 13.685 ms +427.6 us / +3.2% (worse)
Core language and compiler benchmarks
Platform Benchmark ns/op vs base
Linux BenchmarkLookupPCRandom 13.400 ns/op +0.17 ns/op / +1.3% (worse)
Linux BenchmarkMergeCompilerFlags 139.800 ns/op -0.6 ns/op / -0.4% (better)
Linux BenchmarkMergeLinkerFlags 89.530 ns/op +0.42 ns/op / +0.5% (worse)
Linux BenchmarkChannelBuffered 36.490 ns/op +0.02 ns/op / +0.1% (worse)
Linux BenchmarkChannelHandoff 26929 ns/op +494 ns/op / +1.9% (worse)
Linux BenchmarkDefer 45.770 ns/op +0.29 ns/op / +0.6% (worse)
Linux BenchmarkDirectCall 1.558 ns/op +0.002 ns/op / +0.1% (worse)
Linux BenchmarkGlobalRead 1.870 ns/op +0.001 ns/op / +0.1% (worse)
Linux BenchmarkGlobalWrite 2.488 ns/op -0.01 ns/op / -0.4% (better)
Linux BenchmarkGoroutine 31861 ns/op +200 ns/op / +0.6% (worse)
Linux BenchmarkInterfaceCall 7.782 ns/op -0.003 ns/op / -0.03854% (better)
Linux BenchmarkRuntimeGetG 1.868 ns/op +0.001 ns/op / +0.1% (worse)
macOS BenchmarkLookupPCRandom 11.920 ns/op -2.54 ns/op / -17.6% (better)
macOS BenchmarkMergeCompilerFlags 121.900 ns/op -7 ns/op / -5.4% (better)
macOS BenchmarkMergeLinkerFlags 66.660 ns/op -7.25 ns/op / -9.8% (better)
macOS BenchmarkChannelBuffered 24.540 ns/op -2.27 ns/op / -8.5% (better)
macOS BenchmarkChannelHandoff 5431 ns/op -4809 ns/op / -47.0% (better)
macOS BenchmarkDefer 29.670 ns/op -7.33 ns/op / -19.8% (better)
macOS BenchmarkDirectCall 0.985 ns/op -0.2488 ns/op / -20.2% (better)
macOS BenchmarkGlobalRead 1.090 ns/op -0.171 ns/op / -13.6% (better)
macOS BenchmarkGlobalWrite 1.118 ns/op -0.09 ns/op / -7.5% (better)
macOS BenchmarkGoroutine 45652 ns/op +4248 ns/op / +10.3% (worse)
macOS BenchmarkInterfaceCall 4.295 ns/op -0.827 ns/op / -16.1% (better)
macOS BenchmarkRuntimeGetG 2.465 ns/op -0.354 ns/op / -12.6% (better)
Windows MinGW BenchmarkLookupPCRandom 13.200 ns/op +0.08 ns/op / +0.6% (worse)
Windows MinGW BenchmarkMergeCompilerFlags 606 ns/op +0.9 ns/op / +0.1% (worse)
Windows MinGW BenchmarkMergeLinkerFlags 538.600 ns/op +2.7 ns/op / +0.5% (worse)
Windows MinGW BenchmarkChannelBuffered 34.390 ns/op -0.02 ns/op / -0.1% (better)
Windows MinGW BenchmarkChannelHandoff 846.400 ns/op +22.1 ns/op / +2.7% (worse)
Windows MinGW BenchmarkDefer 58.320 ns/op -0.32 ns/op / -0.5% (better)
Windows MinGW BenchmarkDirectCall 1.857 ns/op -0.001 ns/op / -0.1% (better)
Windows MinGW BenchmarkGlobalRead 1.551 ns/op +0.001 ns/op / +0.1% (worse)
Windows MinGW BenchmarkGlobalWrite 2.471 ns/op +0.002 ns/op / +0.1% (worse)
Windows MinGW BenchmarkGoroutine 80973 ns/op -1321 ns/op / -1.6% (better)
Windows MinGW BenchmarkInterfaceCall 9.301 ns/op -0.002 ns/op / -0.0215% (better)
Windows MinGW BenchmarkRuntimeGetG 2.787 ns/op -0.003 ns/op / -0.1% (better)
Windows MinGW 386 BenchmarkLookupPCRandom 27.770 ns/op -0.16 ns/op / -0.6% (better)
Windows MinGW 386 BenchmarkMergeCompilerFlags 722.500 ns/op -38.4 ns/op / -5.0% (better)
Windows MinGW 386 BenchmarkMergeLinkerFlags 673.700 ns/op -0.9 ns/op / -0.1% (better)
Windows MinGW 386 BenchmarkChannelBuffered 47.430 ns/op -0.03 ns/op / -0.1% (better)
Windows MinGW 386 BenchmarkChannelHandoff 962.300 ns/op +159.7 ns/op / +19.9% (worse)
Windows MinGW 386 BenchmarkDefer 43.180 ns/op -2.98 ns/op / -6.5% (better)
Windows MinGW 386 BenchmarkDirectCall 1.747 ns/op -0.001 ns/op / -0.1% (better)
Windows MinGW 386 BenchmarkGlobalRead 1.747 ns/op -0.001 ns/op / -0.1% (better)
Windows MinGW 386 BenchmarkGlobalWrite 8.987 ns/op -0.004 ns/op / -0.04449% (better)
Windows MinGW 386 BenchmarkGoroutine 71063 ns/op -1664 ns/op / -2.3% (better)
Windows MinGW 386 BenchmarkInterfaceCall 11.190 ns/op 0 ns/op / +0.0%
Windows MinGW 386 BenchmarkRuntimeGetG 1.774 ns/op +0.003 ns/op / +0.2% (worse)
Windows MinGW ARM64 BenchmarkLookupPCRandom 12.040 ns/op -0.02 ns/op / -0.2% (better)
Windows MinGW ARM64 BenchmarkMergeCompilerFlags 567.800 ns/op -41.1 ns/op / -6.7% (better)
Windows MinGW ARM64 BenchmarkMergeLinkerFlags 533.300 ns/op -44.6 ns/op / -7.7% (better)
Windows MinGW ARM64 BenchmarkChannelBuffered 43.680 ns/op +0.31 ns/op / +0.7% (worse)
Windows MinGW ARM64 BenchmarkChannelHandoff 2328 ns/op +79 ns/op / +3.5% (worse)
Windows MinGW ARM64 BenchmarkDefer 55.710 ns/op -0.06 ns/op / -0.1% (better)
Windows MinGW ARM64 BenchmarkDirectCall 0.590 ns/op +0.0004 ns/op / +0.1% (worse)
Windows MinGW ARM64 BenchmarkGlobalRead 0.737 ns/op -0.0038 ns/op / -0.5% (better)
Windows MinGW ARM64 BenchmarkGlobalWrite 0.663 ns/op -0.001 ns/op / -0.2% (better)
Windows MinGW ARM64 BenchmarkGoroutine 58463 ns/op -1462 ns/op / -2.4% (better)
Windows MinGW ARM64 BenchmarkInterfaceCall 4.720 ns/op +0.001 ns/op / +0.02119% (worse)
Windows MinGW ARM64 BenchmarkRuntimeGetG 1.805 ns/op +0.034 ns/op / +1.9% (worse)
Windows MSVC BenchmarkLookupPCRandom 9.825 ns/op +0.052 ns/op / +0.5% (worse)
Windows MSVC BenchmarkMergeCompilerFlags 485.100 ns/op +8.1 ns/op / +1.7% (worse)
Windows MSVC BenchmarkMergeLinkerFlags 426.300 ns/op 0 ns/op / +0.0%
Windows MSVC BenchmarkChannelBuffered 48.900 ns/op -0.29 ns/op / -0.6% (better)
Windows MSVC BenchmarkChannelHandoff 1245 ns/op -230 ns/op / -15.6% (better)
Windows MSVC BenchmarkDefer 48.470 ns/op -0.26 ns/op / -0.5% (better)
Windows MSVC BenchmarkDirectCall 0.950 ns/op -0.0132 ns/op / -1.4% (better)
Windows MSVC BenchmarkGlobalRead 0.906 ns/op -0.0523 ns/op / -5.5% (better)
Windows MSVC BenchmarkGlobalWrite 7.238 ns/op +0.001 ns/op / +0.01382% (worse)
Windows MSVC BenchmarkGoroutine 59933 ns/op +2355 ns/op / +4.1% (worse)
Windows MSVC BenchmarkInterfaceCall 5.483 ns/op +0.029 ns/op / +0.5% (worse)
Windows MSVC BenchmarkRuntimeGetG 1.285 ns/op +0.015 ns/op / +1.2% (worse)
Windows MSVC 386 BenchmarkLookupPCRandom 26.770 ns/op +0.24 ns/op / +0.9% (worse)
Windows MSVC 386 BenchmarkMergeCompilerFlags 727.400 ns/op -34.3 ns/op / -4.5% (better)
Windows MSVC 386 BenchmarkMergeLinkerFlags 697.200 ns/op +38.7 ns/op / +5.9% (worse)
Windows MSVC 386 BenchmarkChannelBuffered 43.100 ns/op -0.01 ns/op / -0.0232% (better)
Windows MSVC 386 BenchmarkChannelHandoff 886.800 ns/op -4.4 ns/op / -0.5% (better)
Windows MSVC 386 BenchmarkDefer 50.510 ns/op +0.92 ns/op / +1.9% (worse)
Windows MSVC 386 BenchmarkDirectCall 1.551 ns/op 0 ns/op / +0.0%
Windows MSVC 386 BenchmarkGlobalRead 1.864 ns/op -0.005 ns/op / -0.3% (better)
Windows MSVC 386 BenchmarkGlobalWrite 7.811 ns/op +0.009 ns/op / +0.1% (worse)
Windows MSVC 386 BenchmarkGoroutine 90849 ns/op +1508 ns/op / +1.7% (worse)
Windows MSVC 386 BenchmarkInterfaceCall 9.951 ns/op +0.01 ns/op / +0.1% (worse)
Windows MSVC 386 BenchmarkRuntimeGetG 2.178 ns/op +0.008 ns/op / +0.4% (worse)
Windows MSVC ARM64 BenchmarkLookupPCRandom 12.040 ns/op -0.06 ns/op / -0.5% (better)
Windows MSVC ARM64 BenchmarkMergeCompilerFlags 582.100 ns/op +3.2 ns/op / +0.6% (worse)
Windows MSVC ARM64 BenchmarkMergeLinkerFlags 543.100 ns/op -3.7 ns/op / -0.7% (better)
Windows MSVC ARM64 BenchmarkChannelBuffered 43.690 ns/op +0.12 ns/op / +0.3% (worse)
Windows MSVC ARM64 BenchmarkChannelHandoff 2681 ns/op +2 ns/op / +0.1% (worse)
Windows MSVC ARM64 BenchmarkDefer 66 ns/op -2.19 ns/op / -3.2% (better)
Windows MSVC ARM64 BenchmarkDirectCall 0.664 ns/op -0.0003 ns/op / -0.04517% (better)
Windows MSVC ARM64 BenchmarkGlobalRead 0.737 ns/op -0.0008 ns/op / -0.1% (better)
Windows MSVC ARM64 BenchmarkGlobalWrite 3.796 ns/op +0.001 ns/op / +0.02635% (worse)
Windows MSVC ARM64 BenchmarkGoroutine 58618 ns/op +888 ns/op / +1.5% (worse)
Windows MSVC ARM64 BenchmarkInterfaceCall 4.723 ns/op 0 ns/op / +0.0%
Windows MSVC ARM64 BenchmarkRuntimeGetG 1.771 ns/op 0 ns/op / +0.0%

Timer runtime benchmarks

Platform Operation and runtime ns/op vs base
Linux AfterFuncZeroDelivery/Go 607 ns/op +6.3 ns/op / +1.0% (worse)
Linux AfterFuncZeroDelivery/LLGo 53934 ns/op +269 ns/op / +0.5% (worse)
Linux CreateStop/Go 149 ns/op +0.9 ns/op / +0.6% (worse)
Linux CreateStop/LLGo 706.300 ns/op -218.3 ns/op / -23.6% (better)
Linux RearmStopped/Go 55.040 ns/op -0.11 ns/op / -0.2% (better)
Linux RearmStopped/LLGo 652.200 ns/op -42.4 ns/op / -6.1% (better)
Linux ResetActive/Go 41.180 ns/op -0.57 ns/op / -1.4% (better)
Linux ResetActive/LLGo 407.600 ns/op +62.2 ns/op / +18.0% (worse)
Linux ResetHeap1024/Go 41.570 ns/op -0.1 ns/op / -0.2% (better)
Linux ResetHeap1024/LLGo 146.800 ns/op +1 ns/op / +0.7% (worse)
macOS AfterFuncZeroDelivery/Go 452.100 ns/op -13.9 ns/op / -3.0% (better)
macOS AfterFuncZeroDelivery/LLGo 94377 ns/op -7865 ns/op / -7.7% (better)
macOS CreateStop/Go 128.800 ns/op -31.1 ns/op / -19.4% (better)
macOS CreateStop/LLGo 652.800 ns/op +120.1 ns/op / +22.5% (worse)
macOS RearmStopped/Go 60.560 ns/op -24.85 ns/op / -29.1% (better)
macOS RearmStopped/LLGo 380.400 ns/op -61.2 ns/op / -13.9% (better)
macOS ResetActive/Go 43.800 ns/op -9.04 ns/op / -17.1% (better)
macOS ResetActive/LLGo 161.400 ns/op -67.7 ns/op / -29.6% (better)
macOS ResetHeap1024/Go 40.710 ns/op -5.44 ns/op / -11.8% (better)
macOS ResetHeap1024/LLGo 87.460 ns/op -13.94 ns/op / -13.7% (better)
Windows MinGW AfterFuncZeroDelivery/Go 558.500 ns/op +1.1 ns/op / +0.2% (worse)
Windows MinGW AfterFuncZeroDelivery/LLGo 163362 ns/op +3176 ns/op / +2.0% (worse)
Windows MinGW CreateStop/Go 116.400 ns/op -1.8 ns/op / -1.5% (better)
Windows MinGW CreateStop/LLGo 479.500 ns/op -1.3 ns/op / -0.3% (better)
Windows MinGW RearmStopped/Go 31.470 ns/op +0.07 ns/op / +0.2% (worse)
Windows MinGW RearmStopped/LLGo 300.100 ns/op -12.1 ns/op / -3.9% (better)
Windows MinGW ResetActive/Go 20.070 ns/op +0.01 ns/op / +0.04985% (worse)
Windows MinGW ResetActive/LLGo 172.500 ns/op +14.3 ns/op / +9.0% (worse)
Windows MinGW ResetHeap1024/Go 20.570 ns/op +0.1 ns/op / +0.5% (worse)
Windows MinGW ResetHeap1024/LLGo 146.300 ns/op +2.5 ns/op / +1.7% (worse)
Windows MinGW 386 AfterFuncZeroDelivery/Go 989.400 ns/op +2.4 ns/op / +0.2% (worse)
Windows MinGW 386 AfterFuncZeroDelivery/LLGo 160825 ns/op +1697 ns/op / +1.1% (worse)
Windows MinGW 386 CreateStop/Go 251.900 ns/op +34.3 ns/op / +15.8% (worse)
Windows MinGW 386 CreateStop/LLGo 2233 ns/op -61 ns/op / -2.7% (better)
Windows MinGW 386 RearmStopped/Go 74.270 ns/op +1.6 ns/op / +2.2% (worse)
Windows MinGW 386 RearmStopped/LLGo 379.100 ns/op +8.9 ns/op / +2.4% (worse)
Windows MinGW 386 ResetActive/Go 47.050 ns/op +5.12 ns/op / +12.2% (worse)
Windows MinGW 386 ResetActive/LLGo 1062 ns/op +769.8 ns/op / +263.4% (worse)
Windows MinGW 386 ResetHeap1024/Go 42.300 ns/op -0.05 ns/op / -0.1% (better)
Windows MinGW 386 ResetHeap1024/LLGo 203.700 ns/op +1.5 ns/op / +0.7% (worse)
Windows MinGW ARM64 AfterFuncZeroDelivery/Go 678.200 ns/op +4.2 ns/op / +0.6% (worse)
Windows MinGW ARM64 AfterFuncZeroDelivery/LLGo 130662 ns/op -61 ns/op / -0.04666% (better)
Windows MinGW ARM64 CreateStop/Go 207.800 ns/op +10.1 ns/op / +5.1% (worse)
Windows MinGW ARM64 CreateStop/LLGo 397.500 ns/op -15.4 ns/op / -3.7% (better)
Windows MinGW ARM64 RearmStopped/Go 70.610 ns/op +0.01 ns/op / +0.01416% (worse)
Windows MinGW ARM64 RearmStopped/LLGo 294 ns/op 0 ns/op / +0.0%
Windows MinGW ARM64 ResetActive/Go 31.010 ns/op +0.03 ns/op / +0.1% (worse)
Windows MinGW ARM64 ResetActive/LLGo 126.100 ns/op -2.6 ns/op / -2.0% (better)
Windows MinGW ARM64 ResetHeap1024/Go 31.110 ns/op +0.02 ns/op / +0.1% (worse)
Windows MinGW ARM64 ResetHeap1024/LLGo 142.600 ns/op -0.8 ns/op / -0.6% (better)
Windows MSVC AfterFuncZeroDelivery/Go 588.700 ns/op -1.2 ns/op / -0.2% (better)
Windows MSVC AfterFuncZeroDelivery/LLGo 118749 ns/op -4586 ns/op / -3.7% (better)
Windows MSVC CreateStop/Go 160.700 ns/op +0.1 ns/op / +0.1% (worse)
Windows MSVC CreateStop/LLGo 537.800 ns/op -75.1 ns/op / -12.3% (better)
Windows MSVC RearmStopped/Go 59.820 ns/op +0.1 ns/op / +0.2% (worse)
Windows MSVC RearmStopped/LLGo 300.400 ns/op +26.1 ns/op / +9.5% (worse)
Windows MSVC ResetActive/Go 26.470 ns/op -0.1 ns/op / -0.4% (better)
Windows MSVC ResetActive/LLGo 193.100 ns/op +36.4 ns/op / +23.2% (worse)
Windows MSVC ResetHeap1024/Go 26.770 ns/op -0.05 ns/op / -0.2% (better)
Windows MSVC ResetHeap1024/LLGo 117.500 ns/op -0.4 ns/op / -0.3% (better)
Windows MSVC 386 AfterFuncZeroDelivery/Go 951.800 ns/op -10.4 ns/op / -1.1% (better)
Windows MSVC 386 AfterFuncZeroDelivery/LLGo 188522 ns/op -1126 ns/op / -0.6% (better)
Windows MSVC 386 CreateStop/Go 191.500 ns/op -1.7 ns/op / -0.9% (better)
Windows MSVC 386 CreateStop/LLGo 1684 ns/op +1 ns/op / +0.1% (worse)
Windows MSVC 386 RearmStopped/Go 63.510 ns/op -0.04 ns/op / -0.1% (better)
Windows MSVC 386 RearmStopped/LLGo 332.400 ns/op -12.6 ns/op / -3.7% (better)
Windows MSVC 386 ResetActive/Go 39.180 ns/op -0.15 ns/op / -0.4% (better)
Windows MSVC 386 ResetActive/LLGo 966 ns/op +18.4 ns/op / +1.9% (worse)
Windows MSVC 386 ResetHeap1024/Go 39.310 ns/op -0.16 ns/op / -0.4% (better)
Windows MSVC 386 ResetHeap1024/LLGo 180.200 ns/op -0.7 ns/op / -0.4% (better)
Windows MSVC ARM64 AfterFuncZeroDelivery/Go 673 ns/op +4.9 ns/op / +0.7% (worse)
Windows MSVC ARM64 AfterFuncZeroDelivery/LLGo 130934 ns/op -7730 ns/op / -5.6% (better)
Windows MSVC ARM64 CreateStop/Go 200.900 ns/op -0.4 ns/op / -0.2% (better)
Windows MSVC ARM64 CreateStop/LLGo 435.500 ns/op +12 ns/op / +2.8% (worse)
Windows MSVC ARM64 RearmStopped/Go 70.710 ns/op +0.14 ns/op / +0.2% (worse)
Windows MSVC ARM64 RearmStopped/LLGo 305.500 ns/op +2.7 ns/op / +0.9% (worse)
Windows MSVC ARM64 ResetActive/Go 31.010 ns/op +0.06 ns/op / +0.2% (worse)
Windows MSVC ARM64 ResetActive/LLGo 131.300 ns/op -2.9 ns/op / -2.2% (better)
Windows MSVC ARM64 ResetHeap1024/Go 31.160 ns/op +0.02 ns/op / +0.1% (worse)
Windows MSVC ARM64 ResetHeap1024/LLGo 149 ns/op +0.2 ns/op / +0.1% (worse)

Compared with 14aedcde5c1c measured in the same runner job.

@cpunion
cpunion force-pushed the codex/windows-r12-debug-shell-20260831 branch from a94854c to fcb384c Compare August 31, 2026 10:44
@cpunion cpunion changed the title windows: qualify debuggers and host shells (R12; depends on R10 and R11) windows: qualify debuggers and host shells (R12; depends on xgo-dev/llgo#2463) Aug 31, 2026
@cpunion
cpunion changed the base branch from codex/windows-r11-mingw-arch-20260829 to codex/windows-r11-mingw-arch-upstream-20260831 August 31, 2026 10:44
@cpunion cpunion mentioned this pull request Aug 31, 2026
Open
@cpunion
cpunion force-pushed the codex/windows-r12-debug-shell-20260831 branch from fcb384c to f036b39 Compare August 31, 2026 11:07
@cpunion
cpunion force-pushed the codex/windows-r11-mingw-arch-upstream-20260831 branch from 18c0635 to 14aedcd Compare August 31, 2026 12:24
cpunion added 22 commits August 31, 2026 20:24
@cpunion
ci: qualify Windows debuggers and host shells
4e7bd85
@cpunion
build: preserve explicit Windows PDB linker mode
0fc3e2d
@cpunion
ci: qualify remaining Windows debugger profiles
6e014ba
@cpunion
test: select O0 for Windows PDB integration
81f5cc4
@cpunion
debug: verify mixed Go and C callback stacks
00d0372
@cpunion
build: preserve C source DWARF with Go debug info
5f29d25
@cpunion
debug: verify mixed callback fault stacks
9baf66b
@cpunion
ci: preserve native paths across Windows host shells
9a7261f
@cpunion
ci: fix Windows cross-target debug qualification
66553d8
@cpunion
debug: emit CodeView for explicit Windows PDBs
0e9d1d9
@cpunion
test: isolate mixed LLDB stack fixtures
66c730b
@cpunion
docs: clarify Windows PDB metadata
780ab6b
@cpunion
test: use the resolved Windows executable suffix
a0315ca
@cpunion
test: retain MinGW DWARF verifier sections
8c70684
@cpunion
test: format MinGW DWARF setup
c0abf10
@cpunion
debug: preserve wide Windows 386 integer values
396219e
@cpunion
test: select resolved LLDB source frames
7acf9ae
@cpunion
test: retain Windows DWARF verifier sections
955f32b
@cpunion
ci: use LLVM 19.1.7 target-native debuggers
4930a00
@cpunion
test: honor the default Windows ABI
2e200c5
@cpunion
ci: fix Windows debugger qualification
05f672f
@cpunion
ci: preserve Windows host-shell target profiles
dfdf8c5
@cpunion
cpunion force-pushed the codex/windows-r12-debug-shell-20260831 branch from 338b20e to 5ce1444 Compare August 31, 2026 12:32
@cpunion
cpunion marked this pull request as ready for review August 31, 2026 13:32
@cpunion cpunion mentioned this pull request Aug 31, 2026
Merged
@cpunion

cpunion commented Aug 31, 2026

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R12 validation is complete and the upstream contribution is now tracked in xgo-dev#2465.

@cpunion cpunion closed this Aug 31, 2026
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