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deps: V8: backport detailed line information for the CPU profiler #22688

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deps: V8: backport detailed line information for the CPU profiler #22688

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2 changes: 1 addition & 1 deletion common.gypi
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Original file line number Diff line number Diff line change
Expand Up @@ -29,7 +29,7 @@

# 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.26',
'v8_embedder_string': '-node.27',

# Enable disassembler for `--print-code` v8 options
'v8_enable_disassembler': 1,
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3 changes: 3 additions & 0 deletions deps/v8/src/flag-definitions.h
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Expand Up @@ -1211,6 +1211,9 @@ DEFINE_BOOL(log_function_events, false,
DEFINE_BOOL(prof, false,
"Log statistical profiling information (implies --log-code).")

DEFINE_BOOL(detailed_line_info, true,
"Always generate detailed line information for CPU profiling.")

#if defined(ANDROID)
// Phones and tablets have processors that are much slower than desktop
// and laptop computers for which current heuristics are tuned.
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4 changes: 4 additions & 0 deletions deps/v8/src/isolate.cc
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Expand Up @@ -3285,6 +3285,10 @@ bool Isolate::use_optimizer() {
!is_precise_count_code_coverage() && !is_block_count_code_coverage();
}

bool Isolate::NeedsDetailedOptimizedCodeLineInfo() const {
return NeedsSourcePositionsForProfiling() || FLAG_detailed_line_info;
}

bool Isolate::NeedsSourcePositionsForProfiling() const {
return FLAG_trace_deopt || FLAG_trace_turbo || FLAG_trace_turbo_graph ||
FLAG_turbo_profiling || FLAG_perf_prof || is_profiling() ||
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2 changes: 2 additions & 0 deletions deps/v8/src/isolate.h
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Expand Up @@ -1022,6 +1022,8 @@ class Isolate : private HiddenFactory {

bool NeedsSourcePositionsForProfiling() const;

bool NeedsDetailedOptimizedCodeLineInfo() const;

bool is_best_effort_code_coverage() const {
return code_coverage_mode() == debug::Coverage::kBestEffort;
}
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2 changes: 1 addition & 1 deletion deps/v8/src/optimized-compilation-info.cc
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Expand Up @@ -39,7 +39,7 @@ OptimizedCompilationInfo::OptimizedCompilationInfo(
// Collect source positions for optimized code when profiling or if debugger
// is active, to be able to get more precise source positions at the price of
// more memory consumption.
if (isolate->NeedsSourcePositionsForProfiling()) {
if (isolate->NeedsDetailedOptimizedCodeLineInfo()) {
MarkAsSourcePositionsEnabled();
}

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