67 lines
1.8 KiB
C++
67 lines
1.8 KiB
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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#pragma once
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#include <AK/Badge.h>
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#include <AK/DeprecatedString.h>
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#include <LibJS/Forward.h>
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#include <LibJS/Heap/Handle.h>
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namespace JS::Bytecode {
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struct UnwindInfo {
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Executable const* executable;
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BasicBlock const* handler;
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BasicBlock const* finalizer;
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JS::GCPtr<Environment> lexical_environment;
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bool handler_called { false };
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};
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class BasicBlock {
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AK_MAKE_NONCOPYABLE(BasicBlock);
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public:
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static NonnullOwnPtr<BasicBlock> create(DeprecatedString name);
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~BasicBlock();
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void dump(Executable const&) const;
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ReadonlyBytes instruction_stream() const { return m_buffer.span(); }
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u8* data() { return m_buffer.data(); }
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u8 const* data() const { return m_buffer.data(); }
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size_t size() const { return m_buffer.size(); }
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void grow(size_t additional_size);
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void terminate(Badge<Generator>) { m_terminated = true; }
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bool is_terminated() const { return m_terminated; }
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DeprecatedString const& name() const { return m_name; }
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// ==============================================================
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// FIXME: This is JIT state and shouldn't be part of BasicBlock itself.
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// Offset into the instruction stream where this code block starts.
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size_t offset { 0 };
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// Offsets into the instruction stream where we have RIP-relative jump offsets to here that need patching.
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Vector<size_t> jumps_to_here;
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// Offsets into the instruction stream where we have absolute 64-bit references to here that need patching.
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Vector<size_t> absolute_references_to_here;
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// ==============================================================
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private:
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explicit BasicBlock(DeprecatedString name);
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Vector<u8> m_buffer;
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DeprecatedString m_name;
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bool m_terminated { false };
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};
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}
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