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LibJS: Use the IdentifierTable for NewFunction and NewClass lhs names

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This makes them trivially copyable, which is an assumption multiple
optimizations use when rebuilding the instruction stream.

This fixes most optimized crashes in the test262 suite.
This commit is contained in:
Hendiadyoin1 2023-06-28 18:17:13 +02:00 • committed by Andreas Kling
parent c21255da7f
commit 37067cf3ca
6 changed files with 32 additions and 28 deletions
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28
Userland/Libraries/LibJS/Bytecode/ASTCodegen.cpp
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@ -400,7 +400,7 @@ Bytecode::CodeGenerationErrorOr<void> AssignmentExpression::generate_bytecode(By
// i. Let rref be the result of evaluating AssignmentExpression.
// ii. Let rval be ? GetValue(rref).
if (lhs->is_identifier()) {
TRY(generator.emit_named_evaluation_if_anonymous_function(*m_rhs, static_cast<Identifier const&>(*lhs).string()));
TRY(generator.emit_named_evaluation_if_anonymous_function(*m_rhs, generator.intern_identifier(static_cast<Identifier const&>(*lhs).string())));
} else {
TRY(m_rhs->generate_bytecode(generator));
}
@ -495,7 +495,7 @@ Bytecode::CodeGenerationErrorOr<void> AssignmentExpression::generate_bytecode(By
generator.emit<Bytecode::Op::Store>(lhs_reg);
if (lhs->is_identifier())
TRY(generator.emit_named_evaluation_if_anonymous_function(*m_rhs, static_cast<Identifier const&>(*lhs).string()));
TRY(generator.emit_named_evaluation_if_anonymous_function(*m_rhs, generator.intern_identifier(static_cast<Identifier const&>(*lhs).string())));
else
TRY(m_rhs->generate_bytecode(generator));
@ -907,7 +907,7 @@ Bytecode::CodeGenerationErrorOr<void> ObjectExpression::generate_bytecode(Byteco
if (property_kind == Bytecode::Op::PropertyKind::ProtoSetter) {
TRY(property->value().generate_bytecode(generator));
} else if (property_kind != Bytecode::Op::PropertyKind::Spread) {
DeprecatedFlyString name = string_literal.value();
auto name = generator.intern_identifier(string_literal.value());
TRY(generator.emit_named_evaluation_if_anonymous_function(property->value(), name));
}
@ -994,7 +994,7 @@ Bytecode::CodeGenerationErrorOr<void> FunctionDeclaration::generate_bytecode(Byt
return {};
}
Bytecode::CodeGenerationErrorOr<void> FunctionExpression::generate_bytecode_with_lhs_name(Bytecode::Generator& generator, Optional<DeprecatedFlyString const&> lhs_name) const
Bytecode::CodeGenerationErrorOr<void> FunctionExpression::generate_bytecode_with_lhs_name(Bytecode::Generator& generator, Optional<Bytecode::IdentifierTableIndex> lhs_name) const
{
bool has_name = !name().is_empty();
Optional<Bytecode::IdentifierTableIndex> name_identifier;
@ -1085,9 +1085,9 @@ static Bytecode::CodeGenerationErrorOr<void> generate_object_binding_pattern_byt
generator.switch_to_basic_block(if_undefined_block);
if (auto const* alias_identifier = alias.get_pointer<NonnullRefPtr<Identifier const>>()) {
TRY(generator.emit_named_evaluation_if_anonymous_function(*initializer, (*alias_identifier)->string()));
TRY(generator.emit_named_evaluation_if_anonymous_function(*initializer, generator.intern_identifier((*alias_identifier)->string())));
} else if (auto const* lhs = name.get_pointer<NonnullRefPtr<Identifier const>>()) {
TRY(generator.emit_named_evaluation_if_anonymous_function(*initializer, (*lhs)->string()));
TRY(generator.emit_named_evaluation_if_anonymous_function(*initializer, generator.intern_identifier((*lhs)->string())));
} else {
TRY(initializer->generate_bytecode(generator));
}
@ -1294,9 +1294,9 @@ static Bytecode::CodeGenerationErrorOr<void> generate_array_binding_pattern_byte
generator.switch_to_basic_block(value_is_undefined_block);
if (auto const* alias_identifier = alias.get_pointer<NonnullRefPtr<Identifier const>>()) {
TRY(generator.emit_named_evaluation_if_anonymous_function(*initializer, (*alias_identifier)->string()));
TRY(generator.emit_named_evaluation_if_anonymous_function(*initializer, generator.intern_identifier((*alias_identifier)->string())));
} else if (auto const* name_identifier = name.get_pointer<NonnullRefPtr<Identifier const>>()) {
TRY(generator.emit_named_evaluation_if_anonymous_function(*initializer, (*name_identifier)->string()));
TRY(generator.emit_named_evaluation_if_anonymous_function(*initializer, generator.intern_identifier((*name_identifier)->string())));
} else {
TRY(initializer->generate_bytecode(generator));
}
@ -1356,7 +1356,7 @@ Bytecode::CodeGenerationErrorOr<void> VariableDeclaration::generate_bytecode(Byt
for (auto& declarator : m_declarations) {
if (declarator->init()) {
if (auto const* lhs = declarator->target().get_pointer<NonnullRefPtr<Identifier const>>()) {
TRY(generator.emit_named_evaluation_if_anonymous_function(*declarator->init(), (*lhs)->string()));
TRY(generator.emit_named_evaluation_if_anonymous_function(*declarator->init(), generator.intern_identifier((*lhs)->string())));
} else {
TRY(declarator->init()->generate_bytecode(generator));
}
@ -2273,7 +2273,7 @@ Bytecode::CodeGenerationErrorOr<void> ClassDeclaration::generate_bytecode(Byteco
return {};
}
Bytecode::CodeGenerationErrorOr<void> ClassExpression::generate_bytecode_with_lhs_name(Bytecode::Generator& generator, Optional<DeprecatedFlyString const&> lhs_name) const
Bytecode::CodeGenerationErrorOr<void> ClassExpression::generate_bytecode_with_lhs_name(Bytecode::Generator& generator, Optional<Bytecode::IdentifierTableIndex> lhs_name) const
{
generator.emit<Bytecode::Op::NewClass>(*this, lhs_name);
return {};
@ -2405,9 +2405,9 @@ static Bytecode::CodeGenerationErrorOr<ForInOfHeadEvaluationResult> for_in_of_he
auto& variable = variable_declaration.declarations().first();
if (variable->init()) {
VERIFY(variable->target().has<NonnullRefPtr<Identifier const>>());
auto& binding_id = variable->target().get<NonnullRefPtr<Identifier const>>()->string();
auto binding_id = generator.intern_identifier(variable->target().get<NonnullRefPtr<Identifier const>>()->string());
TRY(generator.emit_named_evaluation_if_anonymous_function(*variable->init(), binding_id));
generator.emit<Bytecode::Op::SetVariable>(generator.intern_identifier(binding_id));
generator.emit<Bytecode::Op::SetVariable>(binding_id);
}
} else {
// 1. Let oldEnv be the running execution context's LexicalEnvironment.
@ -2751,7 +2751,7 @@ Bytecode::CodeGenerationErrorOr<void> MetaProperty::generate_bytecode(Bytecode::
Bytecode::CodeGenerationErrorOr<void> ClassFieldInitializerStatement::generate_bytecode(Bytecode::Generator& generator) const
{
TRY(generator.emit_named_evaluation_if_anonymous_function(*m_expression, m_class_field_identifier_name));
TRY(generator.emit_named_evaluation_if_anonymous_function(*m_expression, generator.intern_identifier(m_class_field_identifier_name)));
generator.perform_needed_unwinds<Bytecode::Op::Return>();
generator.emit<Bytecode::Op::Return>();
return {};
@ -2881,7 +2881,7 @@ Bytecode::CodeGenerationErrorOr<void> ExportStatement::generate_bytecode(Bytecod
// ExportDeclaration : export default AssignmentExpression ;
VERIFY(is<Expression>(*m_statement));
TRY(generator.emit_named_evaluation_if_anonymous_function(static_cast<Expression const&>(*m_statement), DeprecatedFlyString("default"sv)));
TRY(generator.emit_named_evaluation_if_anonymous_function(static_cast<Expression const&>(*m_statement), generator.intern_identifier("default"sv)));
generator.emit<Bytecode::Op::SetVariable>(generator.intern_identifier(ExportStatement::local_name_for_default), Bytecode::Op::SetVariable::InitializationMode::Initialize);
return {};
}