Now that DebugScriptScopeInfo provides the full lexical scope tree for
every script, ScopeIterator no longer switches to context-only
iteration when it leaves the paused closure. Instead it keeps walking
DebugScriptScope into outer lexical scopes, including outer scopes
that don't need a context. Stack-allocated variables of such scopes
are reported as unavailable. Iteration falls back to the context chain
once it leaves the root of the scope tree (e.g. for eval and wrapped
functions).
Empty outer scopes are still skipped for now; a follow-up changes that.
[[Scopes]] is unaffected, since the inspector builds it from the runtime
context chain.
- GetFunctionDebugName() returns undefined for outer scopes whose
enclosing function has no context, instead of using the name of an
unrelated closure context.
- DebugEvaluate uses the closest runtime context when targeting an
outer scope without a context (EvaluationContext()), and always wraps
it for contextless target scopes so the scope's blocklist applies,
even if the closest context is the native context. Otherwise
evaluating `x` in a contextless scope that declares `x` would find a
global `x`.
R=pfaffe@chromium.org
Bug: 545412300
Change-Id: Iaee6cfb7e1bee13c0bd6c3ff61d7e9c82a9b8491
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/8460005
Reviewed-by: Philip Pfaffe <pfaffe@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/main@{#110376}
Simon Zünd
Victor Gomes
Camillo Bruni
jgruber