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deps: cherry-pick 1420e44db0 from upstream V8 #17344

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deps: cherry-pick 1420e44db0 from upstream V8 #17344

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deps: cherry-pick 1420e44db0 from upstream V8 
Original commit message:

    [coverage] Correctly free DebugInfo in the absence of breakpoints

    It's quite possible for DebugInfos to exist without the presence of a
    bytecode array, since DebugInfos are created for all functions for which
    we have a CoverageInfo. Free such objects properly.

    Also move the corresponding deletion of CoverageInfos on unload up
    before the early exit.

    Bug: v8:6000
    Change-Id: Idde45b222290aa8b6828b61ff2251918b8ed2aed
    Reviewed-on: https://chromium-review.googlesource.com/664811
    Reviewed-by: Yang Guo <yangguo@chromium.org>
    Commit-Queue: Jakob Gruber <jgruber@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#48024}

Fixes crash when passing Profiler.startPreciseCoverage before
Debug.paused is received.

Refs: v8/v8@1420e44
Refs: bcoe/c8#6 (comment)
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@TimothyGu
TimothyGu committed Nov 27, 2017
commit bddeb844181755d80d48a0881f53f56f8b11d3d3
2 changes: 1 addition & 1 deletion common.gypi
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Original file line number Diff line number Diff line change
Expand Up @@ -27,7 +27,7 @@

# Reset this number to 0 on major V8 upgrades.
# Increment by one for each non-official patch applied to deps/v8.
'v8_embedder_string': '-node.12',
'v8_embedder_string': '-node.13',

# Enable disassembler for `--print-code` v8 options
'v8_enable_disassembler': 1,
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8 changes: 5 additions & 3 deletions deps/v8/src/debug/debug.cc
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Expand Up @@ -338,13 +338,12 @@ bool Debug::Load() {
void Debug::Unload() {
ClearAllBreakPoints();
ClearStepping();
if (FLAG_block_coverage) RemoveAllCoverageInfos();
RemoveDebugDelegate();

// Return debugger is not loaded.
if (!is_loaded()) return;

if (FLAG_block_coverage) RemoveAllCoverageInfos();

// Clear debugger context global handle.
GlobalHandles::Destroy(Handle<Object>::cast(debug_context_).location());
debug_context_ = Handle<Context>();
Expand Down Expand Up @@ -643,8 +642,11 @@ void Debug::ApplyBreakPoints(Handle<DebugInfo> debug_info) {
}

void Debug::ClearBreakPoints(Handle<DebugInfo> debug_info) {
// If we attempt to clear breakpoints but none exist, simply return. This can
// happen e.g. CoverageInfos exit but no breakpoints are set.
if (!debug_info->HasDebugBytecodeArray()) return;

DisallowHeapAllocation no_gc;
DCHECK(debug_info->HasDebugBytecodeArray());
for (BreakIterator it(debug_info); !it.Done(); it.Next()) {
it.ClearDebugBreak();
}
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