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https://github.com/LadybirdBrowser/ladybird.git
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e7d69c5d3c
This patch changes the LibJS bytecode to be a stream of instructions packed one-after-the-other in contiguous memory, instead of a vector of OwnPtr<Instruction>. This should be a lot more cache-friendly. :^) Instructions are also devirtualized and instead have a type field using a new Instruction::Type enum. To iterate over a bytecode stream, one must now use Bytecode::InstructionStreamIterator.
44 lines
927 B
C++
44 lines
927 B
C++
/*
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* Copyright (c) 2021, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/Bytecode/Instruction.h>
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#include <LibJS/Bytecode/Op.h>
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namespace JS::Bytecode {
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void Instruction::destroy(Instruction& instruction)
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{
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#define __BYTECODE_OP(op) \
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case Type::op: \
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static_cast<Op::op&>(instruction).~op(); \
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return;
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switch (instruction.type()) {
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ENUMERATE_BYTECODE_OPS(__BYTECODE_OP)
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default:
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VERIFY_NOT_REACHED();
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}
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#undef __BYTECODE_OP
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}
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size_t Instruction::length() const
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{
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if (type() == Type::Call)
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return static_cast<Op::Call const&>(*this).length();
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#define __BYTECODE_OP(op) \
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case Type::op: \
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return sizeof(Op::op);
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switch (type()) {
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ENUMERATE_BYTECODE_OPS(__BYTECODE_OP)
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default:
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VERIFY_NOT_REACHED();
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}
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}
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}
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