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v8/test/inspector/debugger/value-unavailable-scopes-expected.txt

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[debug] Report optimized out and certain TDZ values as unavailable. This adds a new --experimental-value-unavailable flag, which is disabled for now. When enabled the debugger reports values that are optimized out by TurboFan and values of certain variables in Temporal Dead Zones (TDZ) as unavailable. Internally we use a special `value_unavailable` accessor info to represent these values, and on the debugger boundary we report these properties with `value`, `get`, or `set`. Doc: https://goo.gle/devtools-value-unavailable Bug: chromium:1328681 Demo: devtools-dbg-stories.netlify.app/crbug-1328681-value-unavailable Change-Id: Idb09a4a148335a950deae60f7c07caecc48826ba Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3627510 Commit-Queue: Benedikt Meurer <bmeurer@chromium.org> Reviewed-by: Yang Guo <yangguo@chromium.org> Cr-Commit-Position: refs/heads/main@{#81509}
2022-07-04 07:13:54 +00:00
Test scopes with unavailable values
Running test: testTemporalDeadZone
variable y correctly reported as <value_unavailable>
Running test: testOptimizedOut
variable y correctly reported as <value_unavailable>
[debug] Report variables in TDZ as 'value unavailable' Consider the function: function foo() { debugger; let y = 1; } V8 will elide the hole initialization for 'y'. When we pause at the debugger statement, then 'y' evaluates to 'undefined'. This CL fixes this in the ScopeIterator. When we encounter local variables with an `undefined` value we check the static scope information if we are stopped *before* the variable's initializer. If yes, then we are in the variable's TDZ and report "value unavailable". Drive-by: Mark `GetSourcePosition()` as `const` to make it available in the visitor method. R=bmeurer@chromium.org Bug: chromium:1328681 Change-Id: I8b966eaa2af64a35a58095a744440851760921a0 Fixed: chromium:1303493 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3829539 Commit-Queue: Simon Zünd <szuend@chromium.org> Reviewed-by: Benedikt Meurer <bmeurer@chromium.org> Cr-Commit-Position: refs/heads/main@{#82483}
2022-08-16 09:13:19 +00:00
Running test: testUnusedValueInTdz
variable y correctly reported as <value_unavailable>
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