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LibJS/JIT: Add fast path for cached GetVariable accesses

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We can now stay in machine code for environment variable read accesses
as long as they are cached and initialized.

20% speed-up on Octane/zlib.js :^)
This commit is contained in:
Andreas Kling 2023-11-06 15:23:49 +01:00
parent 7826c006c1
commit 1d8ec677a3
6 changed files with 147 additions and 3 deletions
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5
Userland/Libraries/LibJS/Runtime/DeclarativeEnvironment.h
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@ -19,6 +19,9 @@ class DeclarativeEnvironment : public Environment {
JS_ENVIRONMENT(DeclarativeEnvironment, Environment);
struct Binding {
static FlatPtr value_offset() { return OFFSET_OF(Binding, value); }
static FlatPtr initialized_offset() { return OFFSET_OF(Binding, initialized); }
DeprecatedFlyString name;
Value value;
bool strict { false };
@ -67,6 +70,8 @@ public:
[[nodiscard]] u64 environment_serial_number() const { return m_environment_serial_number; }
static FlatPtr bindings_offset() { return OFFSET_OF(DeclarativeEnvironment, m_bindings); }
private:
ThrowCompletionOr<Value> get_binding_value_direct(VM&, Binding&, bool strict);
ThrowCompletionOr<void> set_mutable_binding_direct(VM&, Binding&, Value, bool strict);