ladybird/Libraries/LibJS/Interpreter.cpp
Andreas Kling e4bda2e1e7 LibJS: Move Console from Interpreter to GlobalObject
Each JS global object has its own "console", so it makes more sense to
store it in GlobalObject.

We'll need some smartness later to bundle up console messages from all
the different frames that make up a page later, but this works for now.
2020-09-29 21:15:06 +02:00

181 lines
6.6 KiB
C++

/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <AK/Badge.h>
#include <AK/StringBuilder.h>
#include <LibJS/AST.h>
#include <LibJS/Interpreter.h>
#include <LibJS/Runtime/Error.h>
#include <LibJS/Runtime/GlobalObject.h>
#include <LibJS/Runtime/LexicalEnvironment.h>
#include <LibJS/Runtime/MarkedValueList.h>
#include <LibJS/Runtime/NativeFunction.h>
#include <LibJS/Runtime/Object.h>
#include <LibJS/Runtime/Reference.h>
#include <LibJS/Runtime/ScriptFunction.h>
#include <LibJS/Runtime/Shape.h>
#include <LibJS/Runtime/SymbolObject.h>
#include <LibJS/Runtime/Value.h>
//#define INTERPRETER_DEBUG
namespace JS {
NonnullOwnPtr<Interpreter> Interpreter::create_with_existing_global_object(GlobalObject& global_object)
{
DeferGC defer_gc(global_object.heap());
auto interpreter = adopt_own(*new Interpreter(global_object.vm()));
interpreter->m_global_object = make_handle(static_cast<Object*>(&global_object));
return interpreter;
}
Interpreter::Interpreter(VM& vm)
: m_vm(vm)
{
}
Interpreter::~Interpreter()
{
}
Value Interpreter::run(GlobalObject& global_object, const Program& program)
{
ASSERT(!vm().exception());
VM::InterpreterExecutionScope scope(*this);
CallFrame global_call_frame;
global_call_frame.this_value = &global_object;
global_call_frame.function_name = "(global execution context)";
global_call_frame.environment = heap().allocate<LexicalEnvironment>(global_object, LexicalEnvironment::EnvironmentRecordType::Global);
global_call_frame.environment->bind_this_value(global_object, &global_object);
if (vm().exception())
return {};
vm().call_stack().append(move(global_call_frame));
auto result = program.execute(*this, global_object);
vm().pop_call_frame();
return result;
}
GlobalObject& Interpreter::global_object()
{
return static_cast<GlobalObject&>(*m_global_object.cell());
}
const GlobalObject& Interpreter::global_object() const
{
return static_cast<const GlobalObject&>(*m_global_object.cell());
}
void Interpreter::enter_scope(const ScopeNode& scope_node, ArgumentVector arguments, ScopeType scope_type, GlobalObject& global_object)
{
for (auto& declaration : scope_node.functions()) {
auto* function = ScriptFunction::create(global_object, declaration.name(), declaration.body(), declaration.parameters(), declaration.function_length(), current_environment());
vm().set_variable(declaration.name(), function, global_object);
}
if (scope_type == ScopeType::Function) {
m_scope_stack.append({ scope_type, scope_node, false });
return;
}
HashMap<FlyString, Variable> scope_variables_with_declaration_kind;
scope_variables_with_declaration_kind.ensure_capacity(16);
for (auto& declaration : scope_node.variables()) {
for (auto& declarator : declaration.declarations()) {
if (scope_node.is_program()) {
global_object.put(declarator.id().string(), js_undefined());
if (exception())
return;
} else {
scope_variables_with_declaration_kind.set(declarator.id().string(), { js_undefined(), declaration.declaration_kind() });
}
}
}
for (auto& argument : arguments) {
scope_variables_with_declaration_kind.set(argument.name, { argument.value, DeclarationKind::Var });
}
bool pushed_lexical_environment = false;
if (!scope_variables_with_declaration_kind.is_empty()) {
auto* block_lexical_environment = heap().allocate<LexicalEnvironment>(global_object, move(scope_variables_with_declaration_kind), current_environment());
vm().call_stack().last().environment = block_lexical_environment;
pushed_lexical_environment = true;
}
m_scope_stack.append({ scope_type, scope_node, pushed_lexical_environment });
}
void Interpreter::exit_scope(const ScopeNode& scope_node)
{
while (!m_scope_stack.is_empty()) {
auto popped_scope = m_scope_stack.take_last();
if (popped_scope.pushed_environment)
vm().call_frame().environment = vm().call_frame().environment->parent();
if (popped_scope.scope_node.ptr() == &scope_node)
break;
}
// If we unwind all the way, just reset m_unwind_until so that future "return" doesn't break.
if (m_scope_stack.is_empty())
vm().unwind(ScopeType::None);
}
Value Interpreter::execute_statement(GlobalObject& global_object, const Statement& statement, ArgumentVector arguments, ScopeType scope_type)
{
if (!statement.is_scope_node())
return statement.execute(*this, global_object);
auto& block = static_cast<const ScopeNode&>(statement);
enter_scope(block, move(arguments), scope_type, global_object);
if (block.children().is_empty())
vm().set_last_value({}, js_undefined());
for (auto& node : block.children()) {
vm().set_last_value({}, node.execute(*this, global_object));
if (vm().should_unwind()) {
if (!block.label().is_null() && vm().should_unwind_until(ScopeType::Breakable, block.label()))
vm().stop_unwind();
break;
}
}
bool did_return = vm().unwind_until() == ScopeType::Function;
if (vm().unwind_until() == scope_type)
vm().unwind(ScopeType::None);
exit_scope(block);
return did_return ? vm().last_value() : js_undefined();
}
}