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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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2
Libraries/LibJS/Runtime/Exception.cpp
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@ -35,7 +35,7 @@ Exception::Exception(Value value)
{
auto& call_stack = vm().call_stack();
for (ssize_t i = call_stack.size() - 1; i >= 0; --i) {
auto function_name = call_stack[i].function_name;
String function_name = call_stack[i].function_name;
if (function_name.is_empty())
function_name = "<anonymous>";
m_trace.append(function_name);