diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/wasm-traversal.h | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/src/wasm-traversal.h b/src/wasm-traversal.h index 32225fd3f..80378242a 100644 --- a/src/wasm-traversal.h +++ b/src/wasm-traversal.h @@ -128,9 +128,24 @@ struct Walker : public VisitorType { auto* curr = getCurrent(); auto iter = debugLocations.find(curr); if (iter != debugLocations.end()) { - auto location = iter->second; - debugLocations.erase(iter); - debugLocations[expression] = location; + debugLocations[expression] = iter->second; + // Note that we do *not* erase the debug info of the expression being + // replaced, because it may still exist: we might replace + // + // (call + // (block .. + // + // with + // + // (block + // (call .. + // + // We still want the call here to have its old debug info. + // + // (In most cases, of course, we do remove the replaced expression, + // which means we accumulate unused garbage in debugLocations, but + // that's not that bad; we use arena allocation for Expressions, after + // all.) } } } |