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LibJS/Bytecode: Make constant deduplication a bit smarter

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Instead of scanning through the list of seen constants, we now have a
more structured storage of the constants true, false, null, undefined,
and every possible Int32 value.

This fixes an O(n^2) issue found by Kraken/json-stringify-tinderbox.js
This commit is contained in:
Andreas Kling
2024-05-14 14:28:22 +02:00
parent 044539c60b
commit ae90e26315
3 changed files with 54 additions and 15 deletions
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8
Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp
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@@ -383,7 +383,7 @@ Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> UnaryExpression::genera
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> NumericLiteral::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
{
Bytecode::Generator::SourceLocationScope scope(generator, *this);
return generator.add_constant(Value(m_value), Bytecode::Generator::DeduplicateConstant::No);
return generator.add_constant(Value(m_value));
}
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> BooleanLiteral::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
@@ -412,13 +412,13 @@ Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> BigIntLiteral::generate
return MUST(Crypto::SignedBigInteger::from_base(2, m_value.substring(2, m_value.length() - 3)));
return MUST(Crypto::SignedBigInteger::from_base(10, m_value.substring(0, m_value.length() - 1)));
}();
return generator.add_constant(BigInt::create(generator.vm(), move(integer)), Bytecode::Generator::DeduplicateConstant::No);
return generator.add_constant(BigInt::create(generator.vm(), move(integer)));
}
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> StringLiteral::generate_bytecode(Bytecode::Generator& generator, [[maybe_unused]] Optional<ScopedOperand> preferred_dst) const
{
Bytecode::Generator::SourceLocationScope scope(generator, *this);
return generator.add_constant(PrimitiveString::create(generator.vm(), m_value), Bytecode::Generator::DeduplicateConstant::No);
return generator.add_constant(PrimitiveString::create(generator.vm(), m_value));
}
Bytecode::CodeGenerationErrorOr<Optional<ScopedOperand>> RegExpLiteral::generate_bytecode(Bytecode::Generator& generator, Optional<ScopedOperand> preferred_dst) const
@@ -1283,7 +1283,7 @@ static Bytecode::CodeGenerationErrorOr<void> generate_object_binding_pattern_byt
if (name.has<NonnullRefPtr<Identifier const>>()) {
auto const& identifier = name.get<NonnullRefPtr<Identifier const>>()->string();
if (has_rest) {
excluded_property_names.append(generator.add_constant(PrimitiveString::create(generator.vm(), identifier), Bytecode::Generator::DeduplicateConstant::No));
excluded_property_names.append(generator.add_constant(PrimitiveString::create(generator.vm(), identifier)));
}
generator.emit_get_by_id(value, object, generator.intern_identifier(identifier));
} else {