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LibJS: Cache commonly used FlyStrings in the VM

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Roughly 7% of test-js runtime was spent creating FlyStrings from string
literals. This patch frontloads that work and caches all the commonly
used names in LibJS on a CommonPropertyNames struct that hangs off VM.
This commit is contained in:
Andreas Kling 2020-10-13 23:49:19 +02:00
parent 9f6c5f68b6
commit 7b863330dc
45 changed files with 651 additions and 392 deletions
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3
Libraries/LibJS/Interpreter.cpp
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@ -69,7 +69,8 @@ Value Interpreter::run(GlobalObject& global_object, const Program& program)
CallFrame global_call_frame;
global_call_frame.this_value = &global_object;
global_call_frame.function_name = "(global execution context)";
static FlyString global_execution_context_name = "(global execution context)";
global_call_frame.function_name = global_execution_context_name;
global_call_frame.environment = heap().allocate<LexicalEnvironment>(global_object, LexicalEnvironment::EnvironmentRecordType::Global);
global_call_frame.environment->bind_this_value(global_object, &global_object);
global_call_frame.is_strict_mode = program.is_strict_mode();