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https://github.com/RGBCube/serenity
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1c43442be4
Taking a big step towards a world of multiple global object, this patch adds a new JS::VM object that houses the JS::Heap. This means that the Heap moves out of Interpreter, and the same Heap can now be used by multiple Interpreters, and can also outlive them. The VM keeps a stack of Interpreter pointers. We push/pop on this stack when entering/exiting execution with a given Interpreter. This allows us to make this change without disturbing too much of the existing code. There is still a 1-to-1 relationship between Interpreter and the global object. This will change in the future. Ultimately, the goal here is to make Interpreter a transient object that only needs to exist while you execute some code. Getting there will take a lot more work though. :^) Note that in LibWeb, the global JS::VM is called main_thread_vm(), to distinguish it from future worker VM's.
85 lines
2.4 KiB
C++
85 lines
2.4 KiB
C++
/*
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* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <LibJS/Interpreter.h>
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#include <LibJS/Runtime/VM.h>
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namespace JS {
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NonnullRefPtr<VM> VM::create()
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{
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return adopt(*new VM);
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}
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VM::VM()
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: m_heap(*this)
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{
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}
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VM::~VM()
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{
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}
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Interpreter& VM::interpreter()
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{
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if (m_interpreters.is_empty()) {
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asm volatile("ud2");
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}
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// ASSERT(!m_interpreters.is_empty());
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return *m_interpreters.last();
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}
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Interpreter* VM::interpreter_if_exists()
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{
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if (m_interpreters.is_empty())
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return nullptr;
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return m_interpreters.last();
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}
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void VM::push_interpreter(Interpreter& interpreter)
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{
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m_interpreters.append(&interpreter);
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}
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void VM::pop_interpreter(Interpreter& interpreter)
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{
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ASSERT(!m_interpreters.is_empty());
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auto* popped_interpreter = m_interpreters.take_last();
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ASSERT(popped_interpreter == &interpreter);
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}
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VM::InterpreterScope::InterpreterScope(Interpreter& interpreter)
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: m_interpreter(interpreter)
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{
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m_interpreter.vm().push_interpreter(m_interpreter);
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}
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VM::InterpreterScope::~InterpreterScope()
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{
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m_interpreter.vm().pop_interpreter(m_interpreter);
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}
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}
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