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LibJS: Correct behaviour of direct vs. indirect eval

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eval only has direct access to the local scope when accessed through
the name eval. This includes locals named eval, because of course it
does.
This commit is contained in:
Anonymous 2021-06-19 20:13:53 -07:00 • committed by Linus Groh
parent 5d24b5f4be
commit 2822da8c8f
10 changed files with 121 additions and 20 deletions
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30
Userland/Libraries/LibJS/Runtime/AbstractOperations.cpp
View file

@ -7,12 +7,16 @@
#include <AK/Function.h>
#include <AK/Result.h>
#include <AK/TemporaryChange.h>
#include <LibJS/Interpreter.h>
#include <LibJS/Parser.h>
#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/BoundFunction.h>
#include <LibJS/Runtime/DeclarativeEnvironmentRecord.h>
#include <LibJS/Runtime/ErrorTypes.h>
#include <LibJS/Runtime/Function.h>
#include <LibJS/Runtime/FunctionEnvironmentRecord.h>
#include <LibJS/Runtime/GlobalEnvironmentRecord.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/Object.h>
#include <LibJS/Runtime/ObjectEnvironmentRecord.h>
@ -198,4 +202,30 @@ Object* get_super_constructor(VM& vm)
return super_constructor;
}
// 19.2.1.1 PerformEval ( x, callerRealm, strictCaller, direct ), https://tc39.es/ecma262/#sec-performeval
Value perform_eval(Value x, GlobalObject& caller_realm, CallerMode strict_caller, EvalMode direct)
{
VERIFY(direct == EvalMode::Direct || strict_caller == CallerMode::NonStrict);
if (!x.is_string())
return x;
auto& vm = caller_realm.vm();
auto& code_string = x.as_string();
Parser parser { Lexer { code_string.string() } };
auto program = parser.parse_program(strict_caller == CallerMode::Strict);
if (parser.has_errors()) {
auto& error = parser.errors()[0];
vm.throw_exception<SyntaxError>(caller_realm, error.to_string());
return {};
}
auto& interpreter = vm.interpreter();
if (direct == EvalMode::Direct)
return interpreter.execute_statement(caller_realm, program).value_or(js_undefined());
TemporaryChange scope_change(vm.call_frame().lexical_environment, static_cast<EnvironmentRecord*>(&caller_realm.environment_record()));
return interpreter.execute_statement(caller_realm, program).value_or(js_undefined());
}
}

10
Userland/Libraries/LibJS/Runtime/AbstractOperations.h
View file

@ -25,6 +25,16 @@ Function* species_constructor(GlobalObject&, Object const&, Function& default_co
GlobalObject* get_function_realm(GlobalObject&, Function const&);
Object* get_prototype_from_constructor(GlobalObject&, Function const& constructor, Object* (GlobalObject::*intrinsic_default_prototype)());
enum class CallerMode {
Strict,
NonStrict
};
enum class EvalMode {
Direct,
Indirect
};
Value perform_eval(Value, GlobalObject&, CallerMode, EvalMode);
// 10.1.13 OrdinaryCreateFromConstructor ( constructor, intrinsicDefaultProto [ , internalSlotsList ] ), https://tc39.es/ecma262/#sec-ordinarycreatefromconstructor
template<typename T, typename... Args>
T* ordinary_create_from_constructor(GlobalObject& global_object, Function const& constructor, Object* (GlobalObject::*intrinsic_default_prototype)(), Args&&... args)

24
Userland/Libraries/LibJS/Runtime/GlobalObject.cpp
View file

@ -8,13 +8,13 @@
#include <AK/CharacterTypes.h>
#include <AK/Hex.h>
#include <AK/Platform.h>
#include <AK/TemporaryChange.h>
#include <AK/Utf8View.h>
#include <LibJS/Console.h>
#include <LibJS/Heap/DeferGC.h>
#include <LibJS/Interpreter.h>
#include <LibJS/Lexer.h>
#include <LibJS/Parser.h>
#include <LibJS/Runtime/AbstractOperations.h>
#include <LibJS/Runtime/AggregateErrorConstructor.h>
#include <LibJS/Runtime/AggregateErrorPrototype.h>
#include <LibJS/Runtime/ArrayBufferConstructor.h>
@ -140,6 +140,8 @@ void GlobalObject::initialize_global_object()
define_native_function(vm.names.parseFloat, parse_float, 1, attr);
define_native_function(vm.names.parseInt, parse_int, 2, attr);
define_native_function(vm.names.eval, eval, 1, attr);
m_eval_function = &get_without_side_effects(vm.names.eval).as_function();
define_native_function(vm.names.encodeURI, encode_uri, 1, attr);
define_native_function(vm.names.decodeURI, decode_uri, 1, attr);
define_native_function(vm.names.encodeURIComponent, encode_uri_component, 1, attr);
@ -223,6 +225,8 @@ void GlobalObject::visit_edges(Visitor& visitor)
visitor.visit(m_##snake_name##_prototype);
JS_ENUMERATE_ITERATOR_PROTOTYPES
#undef __JS_ENUMERATE
visitor.visit(m_eval_function);
}
JS_DEFINE_NATIVE_FUNCTION(GlobalObject::gc)
@ -335,23 +339,7 @@ JS_DEFINE_NATIVE_FUNCTION(GlobalObject::parse_int)
// 19.2.1 eval ( x ), https://tc39.es/ecma262/#sec-eval-x
JS_DEFINE_NATIVE_FUNCTION(GlobalObject::eval)
{
if (!vm.argument(0).is_string())
return vm.argument(0);
auto& code_string = vm.argument(0).as_string();
JS::Parser parser { JS::Lexer { code_string.string() } };
auto program = parser.parse_program();
if (parser.has_errors()) {
auto& error = parser.errors()[0];
vm.throw_exception<SyntaxError>(global_object, error.to_string());
return {};
}
auto& caller_frame = vm.call_stack().at(vm.call_stack().size() - 2);
TemporaryChange scope_change(vm.call_frame().lexical_environment, caller_frame->lexical_environment);
auto& interpreter = vm.interpreter();
return interpreter.execute_statement(global_object, program).value_or(js_undefined());
return perform_eval(vm.argument(0), global_object, CallerMode::NonStrict, EvalMode::Indirect);
}
// 19.2.6.1.1 Encode ( string, unescapedSet ), https://tc39.es/ecma262/#sec-encode

4
Userland/Libraries/LibJS/Runtime/GlobalObject.h
View file

@ -36,6 +36,8 @@ public:
// Not included in JS_ENUMERATE_NATIVE_OBJECTS due to missing distinct constructor
GeneratorObjectPrototype* generator_object_prototype() { return m_generator_object_prototype; }
Function* eval_function() const { return m_eval_function; }
#define __JS_ENUMERATE(ClassName, snake_name, PrototypeName, ConstructorName, ArrayType) \
ConstructorName* snake_name##_constructor() { return m_##snake_name##_constructor; } \
Object* snake_name##_prototype() { return m_##snake_name##_prototype; }
@ -95,6 +97,8 @@ private:
Object* m_##snake_name##_prototype { nullptr };
JS_ENUMERATE_ITERATOR_PROTOTYPES
#undef __JS_ENUMERATE
Function* m_eval_function;
};
template<typename ConstructorType>