Several fixes to debugging infrastructure: component vs. module PCs and gdbstub wasm module names.#12901
Merged
alexcrichton merged 3 commits intobytecodealliance:mainfrom Mar 31, 2026
Merged
Conversation
…ibrary names. Two bugfixes for guest debugging with components: 1. Convert component-relative source locations to module-relative PCs in the frame table. The guest-debug API presents a core-Wasm view where components are deconstructed into individual modules, so all PCs must be module-relative. This adds a `wasm_module_offset` field to `ModuleTranslation` and `FuncEnvironment`, set during component translation, and subtracts it in `debug_tags()`. 2. Give unique names to "library" entries in the gdbstub XML response. LLDB's DynamicLoader deduplicates by name, so using "wasm" for all modules caused only the first to be loaded.
Introduce `ModulePC` (module-relative) and `ComponentPC` (component-relative) newtype wrappers around u32 Wasm bytecode offsets. These replace raw u32 values throughout the frame table, breakpoint, and debug systems to prevent confusion between the two offset spaces.
cfallin
force-pushed
the
debugging-fixes
branch
from
2dcb6b5 to
207a9e4
Compare
github-actions
bot
added
the
wasmtime:api
cfallin
force-pushed
the
debugging-fixes
branch
from
207a9e4 to
caf5cb0
Compare
alexcrichton
approved these changes
Mar 31, 2026
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Contains several fixes pulled out from #12859:
wasmtime serve. #12859).