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LibJS/JIT: Add fast path for cached PutById

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This commit is contained in:
Andreas Kling 2023-11-09 09:28:04 +01:00
parent b1b2ca1485
commit 55e467c359
7 changed files with 189 additions and 12 deletions
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5
Userland/Libraries/LibJS/Runtime/Shape.h
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@ -57,6 +57,8 @@ public:
void add_property_without_transition(PropertyKey const&, PropertyAttributes);
bool is_unique() const { return m_unique; }
static FlatPtr is_unique_offset() { return OFFSET_OF(Shape, m_unique); }
Shape* create_unique_clone() const;
Realm& realm() const { return m_realm; }
@ -80,6 +82,7 @@ public:
void reconfigure_property_in_unique_shape(StringOrSymbol const& property_key, PropertyAttributes attributes);
[[nodiscard]] u64 unique_shape_serial_number() const { return m_unique_shape_serial_number; }
static FlatPtr unique_shape_serial_number_offset() { return OFFSET_OF(Shape, m_unique_shape_serial_number); }
private:
explicit Shape(Realm&);
@ -106,7 +109,7 @@ private:
PropertyAttributes m_attributes { 0 };
TransitionType m_transition_type : 6 { TransitionType::Invalid };
bool m_unique : 1 { false };
bool m_unique { false };
// Since unique shapes never change identity, inline caches use this incrementing serial number
// to know whether its property table has been modified since last time we checked.