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LibJS/Bytecode: Only emit ResolveThisBinding once per basic block

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Once executed, this instruction will always produce the same result
in subsequent executions, so it's okay to cache it.

Unfortunately it may throw, so we can't just hoist it to the top of
every executable, since that would break observable execution order.
This commit is contained in:
Andreas Kling 2024-05-07 12:16:37 +02:00
commit 0f70ff9a67
Notes: sideshowbarker 2024-07-17 08:43:11 +09:00
4 changed files with 21 additions and 7 deletions
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2
Userland/Libraries/LibJS/Bytecode/Generator.h
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@ -257,6 +257,8 @@ public:
m_boundaries.take_last();
}
[[nodiscard]] Operand get_this(Optional<Operand> preferred_dst = {});
void emit_get_by_id(Operand dst, Operand base, IdentifierTableIndex property_identifier, Optional<IdentifierTableIndex> base_identifier = {});
void emit_get_by_id_with_this(Operand dst, Operand base, IdentifierTableIndex, Operand this_value);