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test(wasm): exceptions in a wasm build, and a sysroot without them

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WasmExceptions builds a fixture for wasm32-wasip1 and runs it under
wasmtime. It throws through four frames whose destructors have to run,
catches the exception, catches one that vector::at throws, and with an
argument lets one escape main, which has to fail the run. With the
previous flags the fixture does not compile ("cannot use 'throw' with
exceptions disabled"), and each part of turning exceptions on fails it
in its own way, from a BMI built without them to the legacy encoding
wasmtime refuses.

WasiSysrootWithoutExceptions takes a scratch sysroot through three
states, no libunwind, libunwind under eh/ and libunwind in the
triple's own directory, and checks that only the first stops the
build, with the message naming the library it looked for. It needs no
working wasm toolchain, so it also runs where the others skip.

WasmHelloRuns and WasmExceptions treat a sysroot without the
exception-enabled libraries as missing and skip. The manifest tests
expect the exception-handling probe on every entry.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
Jorijn van der Graaf 2026-10-31 05:54:48 +01:00
commit 8862092b63
Signed by: jorijnvdgraaf
GPG key ID: 2937E59CDCC1BCFB
8 changed files with 233 additions and 5 deletions
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4
tests/WasmVariants/main.cpp
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@ -97,6 +97,10 @@ int main() {
Check(j.find("\"label\":\"relaxed-simd\"") != std::string::npos, "manifest has relaxed-simd label");
Check(j.find("\"wvhelper.relaxed-simd.wasm\"") != std::string::npos, "manifest has labelled url");
Check(j.find("\"relaxed-simd\"") != std::string::npos, "manifest has relaxed-simd probe");
// Every file is built with exceptions, so every entry needs them
// besides its own features; the baseline needs nothing else.
Check(j.find("\"probes\":[\"relaxed-simd\",\"exception-handling\"]") != std::string::npos, "relaxed-simd entry also probes for exception handling");
Check(j.find("\"url\":\"wvhelper.wasm\",\"probes\":[\"exception-handling\"]") != std::string::npos, "baseline entry probes for exception handling only");
// baseline fallback entry.
Check(j.find("\"wvhelper.wasm\"") != std::string::npos, "manifest has baseline url");
// The relaxed-simd variant must precede the baseline so the runtime