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d1b58ee9ad
No need to instantiate unique symbols for each Interpreter; they can be VM-global. This reduces the memory cost and startup time anyway.
114 lines
3.3 KiB
C++
114 lines
3.3 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/Symbol.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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#define __JS_ENUMERATE(SymbolName, snake_name) \
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m_well_known_symbol_##snake_name = js_symbol(*this, "Symbol." #SymbolName, false);
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JS_ENUMERATE_WELL_KNOWN_SYMBOLS
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#undef __JS_ENUMERATE
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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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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::InterpreterExecutionScope::InterpreterExecutionScope(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::InterpreterExecutionScope::~InterpreterExecutionScope()
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{
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m_interpreter.vm().pop_interpreter(m_interpreter);
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}
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void VM::gather_roots(HashTable<Cell*>& roots)
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{
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if (m_exception)
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roots.set(m_exception);
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for (auto* interpreter : m_interpreters)
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interpreter->gather_roots(roots);
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#define __JS_ENUMERATE(SymbolName, snake_name) \
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roots.set(well_known_symbol_##snake_name());
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JS_ENUMERATE_WELL_KNOWN_SYMBOLS
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#undef __JS_ENUMERATE
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for (auto& symbol : m_global_symbol_map)
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roots.set(symbol.value);
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}
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Symbol* VM::get_global_symbol(const String& description)
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{
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auto result = m_global_symbol_map.get(description);
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if (result.has_value())
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return result.value();
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auto new_global_symbol = js_symbol(*this, description, true);
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m_global_symbol_map.set(description, new_global_symbol);
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return new_global_symbol;
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}
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}
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