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perf: avoid redundant Promise.GetContext calls (#43609)

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refactor: avoid redundant Promise.GetContext calls

Several Promise methods call `GetContext()` multiple times. From looking
at the assembly in obj/electron/electron_lib/promise.o, these redundant
calls are actually being made -- they aren't optmized out.

This PR keeps the return value in a local variable to avoid extra calls.
This commit is contained in:
Charles Kerr 2024-09-07 23:39:42 -05:00 • committed by GitHub
parent 44a4328ea8
commit 0568686340
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2 changed files with 23 additions and 18 deletions
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13
shell/common/gin_helper/promise.h
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@ -123,13 +123,13 @@ class Promise : public PromiseBase {
v8::Maybe<bool> Resolve(const RT& value) {
gin_helper::Locker locker(isolate());
v8::HandleScope handle_scope(isolate());
v8::Local<v8::Context> context = GetContext();
gin_helper::MicrotasksScope microtasks_scope{
isolate(), GetContext()->GetMicrotaskQueue(), false,
isolate(), context->GetMicrotaskQueue(), false,
v8::MicrotasksScope::kRunMicrotasks};
v8::Context::Scope context_scope(GetContext());
v8::Context::Scope context_scope(context);
return GetInner()->Resolve(GetContext(),
gin::ConvertToV8(isolate(), value));
return GetInner()->Resolve(context, gin::ConvertToV8(isolate(), value));
}
template <typename... ResolveType>
@ -144,12 +144,13 @@ class Promise : public PromiseBase {
"promises resolve type");
gin_helper::Locker locker(isolate());
v8::HandleScope handle_scope(isolate());
v8::Context::Scope context_scope(GetContext());
v8::Local<v8::Context> context = GetContext();
v8::Context::Scope context_scope(context);
v8::Local<v8::Value> value = gin::ConvertToV8(isolate(), std::move(cb));
v8::Local<v8::Function> handler = value.As<v8::Function>();
return GetHandle()->Then(GetContext(), handler);
return GetHandle()->Then(context, handler);
}
};