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Simon Zünd 94d37c9338 [debug] Keep empty scopes in the debugger scope chain 
ScopeIterator skipped scopes that don't declare any variables (other
than the paused function's own scope). Now that ScopeIterator walks the
full lexical scope tree, keep empty scopes, so that the scope chain
reported via CDP (flagged with Debugger.Scope.emptyReason) matches the
lexical scopes, e.g. to match them against scopes in source maps and to
target them via `evaluateOnCallFrame` with `scopeNumber`.

Empty script scopes and empty eval root scopes (which also back wrapped
and Function() functions) are still skipped. [[Scopes]] is unaffected,
since the inspector omits empty scopes there itself.

R=pfaffe@chromium.org

Bug: 545412300
Change-Id: I0a5c0d71e66f7c4f747770c350713ff97dcc38ee
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/8460466
Reviewed-by: Philip Pfaffe <pfaffe@chromium.org>
Commit-Queue: Simon Zünd <szuend@chromium.org>
Cr-Commit-Position: refs/heads/main@{#110382}
2026-10-07 01:32:18 -07:00
..
compiler
[debug] Deoptimize topmost optimized frame on debugger break
2026-07-27 05:13:33 -07:00
es6
[inspector] Deprecate Debugger.setScriptSource and remove liveedit tests
2026-08-11 00:58:09 -07:00
es8
[tests] Remove mentions of --no-always-turbofan
2025-07-24 01:45:38 -07:00
harmony
[debug] Keep empty scopes in the debugger scope chain
2026-10-07 01:32:18 -07:00
ignition
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
regress
[debug] Wait for optimization to finish before deopting
2026-04-16 07:16:30 -07:00
side-effect
[debug] Clear overlapping temporary regions during disabled tracking
2026-07-10 03:11:03 -07:00
wasm
[test] Remove asm.js-related tests
2026-07-21 07:28:09 -07:00
debug-allscopes-on-debugger.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-backtrace.js
[tests] Fix assertFalse(exception) anti-pattern
2018-03-21 10:59:46 +00:00
debug-bigint.js
Remove always-true --harmony-bigint runtime flag
2018-10-01 11:31:13 +00:00
debug-break-class-fields.js
[parser] Only reparse the relevant segments for class initializers
2024-07-05 11:49:39 +00:00
debug-break-inline.js
[Test] Add PrepareForOptimization to debugger/ tests.
2019-04-29 13:47:16 +00:00
debug-break-microtask.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-break-native.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-break-return.js
[debug] removed most debugger js
2018-06-03 06:02:59 +00:00
debug-breakpoints.js
[debug-wrapper] Further extend the debug wrapper
2016-11-16 08:34:44 +00:00
debug-clearbreakpoint.js
[tests] Fix assertFalse(exception) anti-pattern
2018-03-21 10:59:46 +00:00
debug-compile-event.js
[tests] Fix assertFalse(exception) anti-pattern
2018-03-21 10:59:46 +00:00
debug-compile-optimized.js
[tests] Remove mentions of --no-always-turbofan
2025-07-24 01:45:38 -07:00
debug-conditional-breakpoints.js
[debug-wrapper] Migrate more tests
2016-11-22 12:44:18 +00:00
debug-constructor.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-enable-disable-breakpoints.js
[debug-wrapper] Further extend the debug wrapper
2016-11-16 08:34:44 +00:00
debug-eval-scope.js
[debug] Walk outer lexical scopes via DebugScriptScope
2026-10-06 21:52:25 -07:00
debug-evaluate-arguments.js
[Test] Add PrepareForOptimization to debugger/ tests.
2019-04-29 13:47:16 +00:00
debug-evaluate-bool-constructor.js
[tests] Fix assertFalse(exception) anti-pattern
2018-03-21 10:59:46 +00:00
debug-evaluate-closure.js
[inspector] Add 'scopeNumber' to 'Debugger.evaluateOnCallFrame'
2026-08-05 04:35:02 -07:00
debug-evaluate-dead-function-fails.js
[tests] Remove mentions of --no-always-turbofan
2025-07-24 01:45:38 -07:00
debug-evaluate-declaration.js
[debug-wrapper] Conditional breaks, locals, evaluate, scopes
2016-11-11 12:08:34 +00:00
debug-evaluate-function-var.js
Reland "[debugger] Expose reference to the function in debug-evaluate"
2019-06-27 06:09:22 +00:00
debug-evaluate-local-repl-hole.js
Introduce REPL mode
2019-11-06 09:17:04 +00:00
debug-evaluate-locals-capturing.js
[tests] Remove mentions of --no-always-turbofan
2025-07-24 01:45:38 -07:00
debug-evaluate-locals-optimized-double.js
[Test] Add PrepareForOptimization to debugger/ tests.
2019-04-29 13:47:16 +00:00
debug-evaluate-locals-optimized.js
[Test] Add PrepareForOptimization to debugger/ tests.
2019-04-29 13:47:16 +00:00
debug-evaluate-locals.js
[inspector] Add 'scopeNumber' to 'Debugger.evaluateOnCallFrame'
2026-08-05 04:35:02 -07:00
debug-evaluate-modify-catch-block-scope.js
[tests] Remove mentions of --no-always-turbofan
2025-07-24 01:45:38 -07:00
debug-evaluate-modify-this.js
[debugger] Further stepping support in test wrapper
2016-11-07 12:25:24 +00:00
debug-evaluate-nested-let.js
[inspector] Add 'scopeNumber' to 'Debugger.evaluateOnCallFrame'
2026-08-05 04:35:02 -07:00
debug-evaluate-repl-mode-await.js
Reland "Implement top-level await for REPL mode"
2019-12-06 10:13:00 +00:00
debug-evaluate-repl-mode-optimized.js
[flags] Rename --opt to --turbofan
2022-05-03 12:10:30 +00:00
debug-evaluate-repl-mode.js
Adding support for const redeclaration on REPL mode.
2021-05-11 16:47:04 +00:00
debug-evaluate-shadowed-context-reuse.js
[debug] Walk outer lexical scopes via DebugScriptScope
2026-10-06 21:52:25 -07:00
debug-evaluate-shadowed-context.js
[debug] Walk outer lexical scopes via DebugScriptScope
2026-10-06 21:52:25 -07:00
debug-evaluate-with.js
[tests] Fix assertFalse(exception) anti-pattern
2018-03-21 10:59:46 +00:00
debug-evaluate.js
[tests] Fix assertFalse(exception) anti-pattern
2018-03-21 10:59:46 +00:00
debug-event-listener.js
[debug-wrapper] Add caught/uncaught to exception pauses
2016-11-10 09:05:29 +00:00
debug-exceptions.js
[debug-wrapper] Add caught/uncaught to exception pauses
2016-11-10 09:05:29 +00:00
debug-function-scopes.js
[debug] Keep empty scopes in the debugger scope chain
2026-10-07 01:32:18 -07:00
debug-generator-break-on-stack.js
[debugger] Further stepping support in test wrapper
2016-11-07 12:25:24 +00:00
debug-generator-break.js
[debugger] Further stepping support in test wrapper
2016-11-07 12:25:24 +00:00
debug-materialized.js
Reland "[debug] Remove 'value unavailble' experiment"
2024-01-24 10:43:56 +00:00
debug-modules-many-variables.mjs
[scope-info] Hash module variable names in large module scopes
2026-08-31 04:38:16 -07:00
debug-modules-set-variable-value.mjs
[debug] Walk outer lexical scopes via DebugScriptScope
2026-10-06 21:52:25 -07:00
debug-multiple-breakpoints.js
[debug-wrapper] Migrate more tests
2016-11-22 12:44:18 +00:00
debug-multiple-var-decl.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-negative-break-points.js
[debug-wrapper] Migrate more tests
2016-11-22 12:44:18 +00:00
debug-optimize.js
[tests] Remove mentions of --no-always-turbofan
2025-07-24 01:45:38 -07:00
debug-print.js
[elements] Rename FAST elements kinds
2017-06-30 13:31:44 +00:00
debug-receiver.js
Fix common misspellings
2017-08-02 09:35:28 +00:00
debug-return-value.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-scopes-suspended-generators.js
[debug] Walk outer lexical scopes via DebugScriptScope
2026-10-06 21:52:25 -07:00
debug-scopes.js
[debug] Keep empty scopes in the debugger scope chain
2026-10-07 01:32:18 -07:00
debug-set-variable-value.js
[tests] Remove mentions of --no-always-turbofan
2025-07-24 01:45:38 -07:00
debug-stack-check-position.js
Reland "[debug] Immediately step-in for 'stack check triggered' debug breaks"
2022-09-01 10:33:03 +00:00
debug-step-2.js
[debugger] Further stepping support in test wrapper
2016-11-07 12:25:24 +00:00
debug-step-3.js
[debugger] Further stepping support in test wrapper
2016-11-07 12:25:24 +00:00
debug-step-4.js
[debugger] Further stepping support in test wrapper
2016-11-07 12:25:24 +00:00
debug-step-end-of-script.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-step-into-explicit-resource-management.js
[explicit-resource-management] Add more DevTools tests
2025-05-21 11:02:20 -07:00
debug-step-into-json.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-step-into-valueof.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-step-microtask.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-step-stub-callfunction.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-step-turbofan.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-step.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-stepin-accessor-ic.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-stepin-accessor.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-stepin-builtin-callback-opt.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-stepin-builtin-callback.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-stepin-builtin.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-stepin-call-function-stub.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-stepin-construct-call.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-stepin-constructor.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-stepin-foreach.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-stepin-function-call.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-stepin-property-function-call.js
[flags] Rename --opt to --turbofan
2022-05-03 12:10:30 +00:00
debug-stepnext-do-while.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-stepout-recursive-function.js
[debugger] Further stepping support in test wrapper
2016-11-07 12:25:24 +00:00
debug-stepout-scope-part1.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-stepout-scope-part2.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-stepout-scope-part3.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-stepout-scope-part4.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-stepout-scope-part5.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-stepout-scope-part6.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-stepout-scope-part7.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-stepout-scope-part8.js
[debug][cleanup] Use consistent StepInto and StepOver naming.
2021-06-01 11:26:57 +00:00
debug-stepout-to-builtin.js
[debugger] Further stepping support in test wrapper
2016-11-07 12:25:24 +00:00
deserialize-script-id.js
[debug] retire ScriptWrapper
2018-07-05 21:33:03 +00:00
for-in-opt.js
[Test] Add PrepareForOptimization to debugger/ tests.
2019-04-29 13:47:16 +00:00
function-source.js
[debug-wrapper] clearAllBreakPoints and several scripts functions
2016-11-17 09:34:18 +00:00
futex-reentrant-wait.js
[api] Prepare DisallowJavascriptExecution scope around api callbacks
2026-08-06 02:10:30 -07:00
lazy-deopt-then-flush-bytecode.js
[flag] Remove remaining mentions of --always-turbofan
2025-07-28 05:50:27 -07:00
regress-3225.js
[tests] Remove mentions of --no-always-turbofan
2025-07-24 01:45:38 -07:00
regress-5207.js
[ignition/turbo] Perform liveness analysis on the bytecodes
2016-11-29 12:27:15 +00:00
regress-debug-scopes-context-blocklist.js
[debug] Walk outer lexical scopes via DebugScriptScope
2026-10-06 21:52:25 -07:00