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4b47245e99
The Rust FFI requires UTF-16 source data, so ASCII-stored source code must be widened to UTF-16. Previously, this conversion was done into a temporary buffer on every call to compile_function, meaning the entire source file was converted for each lazily-compiled function. For large modules with many functions, this caused heavy spinning. Move the conversion into SourceCode::utf16_data() which lazily converts and caches the result once per source file. Subsequent compilations of functions from the same file reuse the cached data.
50 lines
1.5 KiB
C++
50 lines
1.5 KiB
C++
/*
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* Copyright (c) 2022-2023, Andreas Kling <andreas@ladybird.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/String.h>
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#include <AK/Utf16String.h>
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#include <AK/Vector.h>
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#include <LibJS/Export.h>
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#include <LibJS/Forward.h>
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#include <LibJS/Position.h>
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namespace JS {
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class JS_API SourceCode : public RefCounted<SourceCode> {
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public:
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static NonnullRefPtr<SourceCode const> create(String filename, Utf16String code);
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String const& filename() const { return m_filename; }
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Utf16String const& code() const { return m_code; }
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Utf16View const& code_view() const { return m_code_view; }
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size_t length_in_code_units() const { return m_length_in_code_units; }
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u16 const* utf16_data() const;
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SourceRange range_from_offsets(u32 start_offset, u32 end_offset) const;
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private:
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SourceCode(String filename, Utf16String code);
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String m_filename;
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Utf16String m_code;
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Utf16View m_code_view;
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size_t m_length_in_code_units { 0 };
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// For fast mapping of offsets to line/column numbers, we build a list of
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// starting points (with byte offsets into the source string) and which
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// line:column they map to. This can then be binary-searched.
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void fill_position_cache() const;
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Vector<Position> mutable m_cached_positions;
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// Cached UTF-16 widening of ASCII source data, lazily populated by
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// utf16_data() for use by the Rust compilation pipeline.
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Vector<u16> mutable m_utf16_data_cache;
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};
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}
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