Fix panic compiling an empty component with debug info - #14130
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fitzgen merged 1 commit intoAug 13, 2026
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generate_simulated_dwarf unwrapped the first core-module translation to name its compilation unit, but a component with no core modules has no translations, so `wasmtime compile -D debug-info=y` panicked on a valid `(component)` input. Return early instead: with no translations there are no functions to describe.
alexcrichton
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Aug 14, 2026
* Fix panic compiling an empty component with debug info (#14130) generate_simulated_dwarf unwrapped the first core-module translation to name its compilation unit, but a component with no core modules has no translations, so `wasmtime compile -D debug-info=y` panicked on a valid `(component)` input. Return early instead: with no translations there are no functions to describe. * Run linker callback finalizers on invalid names (#14126) * Shuffle more finalizers in the C API (#14133) * Shuffle more finalizers in the C API This implements a similar refactoring to #14126 but for the component linker as well. * Clang-format * fix(wasmtime-cli): generic eio error thrown for wasip2 (#14107) * Cranelift: unwind last-store state after removing a dead store (#14111) Alias analysis's dead-store elimination removed the dead store's `mem_values` entry, but left the region's last-store slot naming the instruction it had just deleted. Leaving the removed-store meant that when we then reprocess the overwriting store, we keyed its lookup on a removed instruction, found nothing, and failed to notice that (for example) the overwriting store became idempotent and could also be removed. With this commit, each store now records the memory version it displaced, and eliminating a dead store rolls that version back, so a chain like v1 = load.i32 region0 v0 store region0 v2, v0 ;; dead store region0 v1, v0 ;; idempotent once the dead store is gone collapses in the single pass we actually make, rather than removing only one link in the chain and requiring that we do N passes to fully clean up a chain of N dead/idempotent stores. This code pattern the shape fused sync adapters emit around the `MAY_LEAVE` flag and the relevant disas tests each lose a store as a result. * Alias analysis: do not restore the last-fence into a region slot (#14134) * Alias analysis: do not restore the last-fence into a region slot When we eliminate a dead store, we undo the effects that the dead store had on the `LastStore` state. However, querying the last store for a particular region falls back to the last fence, and we were incorrectly restoring that last fence into the region slot, rather than resetting the region slot to `None`. While technically incorrect, it was generally benign, but it did lead to "observing" instructions that we didn't mark observed during our initial observation pass, which ultimately led to debug assertion failures. Fixes #14131 * untrim whitespace in filetests * Return is-directory when a directory fd is used as a file (#14135) * wasip2: return is-directory when a directory fd is used as a file Descriptor::file() treated a directory as a bad descriptor. POSIX read/write on a directory is EISDIR, and wasi:filesystem already has is-directory. Preview1 guests still get EBADF (separate match and adapter). Signed-off-by: Sebastien Tardif <sebtardif@ncf.ca> * wasip2: map is-directory only on read-via-stream Descriptor::file() must stay bad-descriptor for directories. wasi-testsuite filesystem-advise expects that for advise. Return is-directory from read-via-stream only (p2 result, p3 result future) so a directory read matches POSIX EISDIR. Signed-off-by: Sebastien Tardif <sebtardif@ncf.ca> --------- Signed-off-by: Sebastien Tardif <sebtardif@ncf.ca> * Fix test expectations --------- Signed-off-by: Sebastien Tardif <sebtardif@ncf.ca> Co-authored-by: m0g3r <87276771+m0g3r@users.noreply.github.com> Co-authored-by: grandpig <grandpig@outlook.com> Co-authored-by: Eduardo de Moura Rodrigues <16357187+eduardomourar@users.noreply.github.com> Co-authored-by: Nick Fitzgerald <fitzgen@gmail.com> Co-authored-by: Sebastien Tardif <SebTardif@ncf.ca>
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Fixes #14100.
generate_simulated_dwarf unwrapped the first core-module translation to name its compilation unit, but a component with no core modules has no translations, so
wasmtime compile -D debug-info=ypanicked on a valid(component)input. Return early instead: with no translations there are no functions to describe.