ce634957c1
Unwind contexts now remember the lexical and variable environments in effect when they were created. If an exception is caught, we revert to those environments in the running execution context.
58 lines
1.6 KiB
C++
58 lines
1.6 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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Handle<Environment> lexical_environment;
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Handle<Environment> variable_environment;
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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, size_t size = 4 * KiB);
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~BasicBlock();
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void seal();
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void dump(Executable const&) const;
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ReadonlyBytes instruction_stream() const { return ReadonlyBytes { m_buffer, m_buffer_size }; }
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size_t size() const { return m_buffer_size; }
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void* next_slot() { return m_buffer + m_buffer_size; }
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bool can_grow(size_t additional_size) const { return m_buffer_size + additional_size <= m_buffer_capacity; }
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void grow(size_t additional_size);
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void terminate(Badge<Generator>, Instruction const* terminator) { m_terminator = terminator; }
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bool is_terminated() const { return m_terminator != nullptr; }
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Instruction const* terminator() const { return m_terminator; }
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DeprecatedString const& name() const { return m_name; }
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private:
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BasicBlock(DeprecatedString name, size_t size);
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u8* m_buffer { nullptr };
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Instruction const* m_terminator { nullptr };
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size_t m_buffer_capacity { 0 };
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size_t m_buffer_size { 0 };
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DeprecatedString m_name;
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};
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}
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