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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
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@ -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());
}
}