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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "third_party/blink/renderer/platform/bindings/lazy_source_location.h"
#include "third_party/blink/renderer/platform/bindings/v8_binding.h"
#include "third_party/blink/renderer/platform/runtime_enabled_features.h"
#include "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
namespace blink {
LazySourceLocation* LazySourceLocation::FromCurrentStack(v8::Isolate* isolate) {
DCHECK(isolate);
if (!isolate->InContext()) {
return MakeGarbageCollected<LazySourceLocation>();
}
v8::Local<v8::StackTrace> stack_trace =
v8::StackTrace::CurrentStackTrace(isolate, /*frame_limit=*/1);
if (stack_trace->GetFrameCount() == 0) {
return MakeGarbageCollected<LazySourceLocation>();
}
v8::Local<v8::StackFrame> stack_frame = stack_trace->GetFrame(isolate, 0);
int script_position = stack_frame->GetSourcePosition();
v8::Local<v8::String> script_name_v8 =
stack_frame->GetScriptNameOrSourceURL();
if (RuntimeEnabledFeatures::LongAnimationFrameSourceLineColumnEnabled()) {
v8::Location location = stack_frame->GetLocation();
return MakeGarbageCollected<LazySourceLocation>(
isolate, script_name_v8, script_position, location.GetLineNumber(),
location.GetColumnNumber());
}
return MakeGarbageCollected<LazySourceLocation>(isolate, script_name_v8,
script_position);
}
LazySourceLocation::LazySourceLocation() = default;
LazySourceLocation::LazySourceLocation(const String& url) : url_(url) {}
LazySourceLocation::LazySourceLocation(v8::Isolate* isolate,
v8::Local<v8::String> url,
int char_position)
: char_position_(char_position) {
url_.emplace<TraceWrapperV8Reference<v8::String>>(isolate, url);
}
LazySourceLocation::LazySourceLocation(v8::Isolate* isolate,
v8::Local<v8::String> url,
int char_position,
int line_number,
int column_number)
: char_position_(char_position),
line_number_(line_number),
column_number_(column_number) {
url_.emplace<TraceWrapperV8Reference<v8::String>>(isolate, url);
}
LazySourceLocation::~LazySourceLocation() = default;
// The core method that handles the lazy conversion.
// The URL string is converted from a V8 handle to a Blink string
// only when this method is called for the first time.
const String& LazySourceLocation::Url(v8::Isolate* isolate) const {
if (std::holds_alternative<TraceWrapperV8Reference<v8::String>>(url_)) {
const auto& persistent =
std::get<TraceWrapperV8Reference<v8::String>>(url_);
if (!persistent.IsEmpty()) {
url_ = ToCoreStringWithNullCheck(isolate, persistent.Get(isolate));
} else {
url_ = String();
}
}
return std::get<String>(url_);
}
void LazySourceLocation::Trace(Visitor* visitor) const {
if (std::holds_alternative<TraceWrapperV8Reference<v8::String>>(url_)) {
visitor->Trace(std::get<TraceWrapperV8Reference<v8::String>>(url_));
}
}
} // namespace blink
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