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https://github.com/LadybirdBrowser/ladybird.git
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44b2735b9e
Instead of caching start-of-line offsets, we now cache byte offsets at regular intervals. This fixes an issue where we had terrible performance on large minified JS, since that often means one very, VERY long line (with no line endings to cache). My machine was spending ~35ms per stack frame when throwing errors on some heavy minified websites, and after this patch, we now spend <1ms per stack frame.
39 lines
948 B
C++
39 lines
948 B
C++
/*
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* Copyright (c) 2022-2023, 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/String.h>
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#include <AK/Vector.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 SourceCode : public RefCounted<SourceCode> {
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public:
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static NonnullRefPtr<SourceCode const> create(String filename, String code);
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String const& filename() const;
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String const& code() 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, String code);
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String m_filename;
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String m_code;
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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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};
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}
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