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LibJS/Bytecode: Determine strict mode on an executable basis

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An executable is generated for the top-level script and for each
function. Strict mode can only be changed with the first statement of
the top-level script and each function, which corresponds directly to
Executable.
This commit is contained in:
Luke Wilde 2022-07-17 18:56:36 +01:00 • committed by Linus Groh
parent 37ab7cc694
commit 8568d18d7d
3 changed files with 15 additions and 3 deletions
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1
Userland/Libraries/LibJS/Bytecode/Executable.h
View file

@ -20,6 +20,7 @@ struct Executable {
NonnullOwnPtr<StringTable> string_table;
NonnullOwnPtr<IdentifierTable> identifier_table;
size_t number_of_registers { 0 };
bool is_strict_mode { false };
String const& get_string(StringTableIndex index) const { return string_table->get(index); }
FlyString const& get_identifier(IdentifierTableIndex index) const { return identifier_table->get(index); }

14
Userland/Libraries/LibJS/Bytecode/Generator.cpp
View file

@ -41,12 +41,24 @@ CodeGenerationErrorOr<NonnullOwnPtr<Executable>> Generator::generate(ASTNode con
generator.emit<Bytecode::Op::Yield>(nullptr);
}
}
bool is_strict_mode = false;
if (is<Program>(node))
is_strict_mode = static_cast<Program const&>(node).is_strict_mode();
else if (is<FunctionBody>(node))
is_strict_mode = static_cast<FunctionBody const&>(node).in_strict_mode();
else if (is<FunctionDeclaration>(node))
is_strict_mode = static_cast<FunctionDeclaration const&>(node).is_strict_mode();
else if (is<FunctionExpression>(node))
is_strict_mode = static_cast<FunctionExpression const&>(node).is_strict_mode();
return adopt_own(*new Executable {
.name = {},
.basic_blocks = move(generator.m_root_basic_blocks),
.string_table = move(generator.m_string_table),
.identifier_table = move(generator.m_identifier_table),
.number_of_registers = generator.m_next_register });
.number_of_registers = generator.m_next_register,
.is_strict_mode = is_strict_mode });
}
void Generator::grow(size_t additional_size)

3
Userland/Libraries/LibJS/Bytecode/Interpreter.cpp
View file

@ -57,8 +57,7 @@ Interpreter::ValueAndFrame Interpreter::run_and_return_frame(Executable const& e
execution_context.lexical_environment = &m_realm.global_environment();
execution_context.variable_environment = &m_realm.global_environment();
execution_context.realm = &m_realm;
// FIXME: How do we know if we're in strict mode? Maybe the Bytecode::Block should know this?
// execution_context.is_strict_mode = ???;
execution_context.is_strict_mode = executable.is_strict_mode;
vm().push_execution_context(execution_context);
pushed_execution_context = true;
}