mirror of
https://github.com/simdjson/simdjson
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evbse
74 lines
2.5 KiB
C++
74 lines
2.5 KiB
C++
#ifndef SIMDJSON_HASWELL_STRINGPARSING_DEFS_H
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#define SIMDJSON_HASWELL_STRINGPARSING_DEFS_H
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#ifndef SIMDJSON_CONDITIONAL_INCLUDE
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#include "simdjson/haswell/base.h"
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#include "simdjson/haswell/simd.h"
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#include "simdjson/haswell/bitmanipulation.h"
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#endif // SIMDJSON_CONDITIONAL_INCLUDE
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namespace simdjson {
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namespace haswell {
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namespace {
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using namespace simd;
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// Holds backslashes and quotes locations.
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struct backslash_and_quote {
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public:
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static constexpr uint32_t BYTES_PROCESSED = 32;
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simdjson_inline backslash_and_quote copy_and_find(const uint8_t *src, uint8_t *dst);
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simdjson_inline bool has_quote_first() { return ((bs_bits - 1) & quote_bits) != 0; }
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simdjson_inline bool has_backslash() { return ((quote_bits - 1) & bs_bits) != 0; }
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simdjson_inline int quote_index() { return trailing_zeroes(quote_bits); }
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simdjson_inline int backslash_index() { return trailing_zeroes(bs_bits); }
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uint32_t bs_bits;
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uint32_t quote_bits;
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}; // struct backslash_and_quote
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simdjson_inline backslash_and_quote backslash_and_quote::copy_and_find(const uint8_t *src, uint8_t *dst) {
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// this can read up to 15 bytes beyond the buffer size, but we require
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// SIMDJSON_PADDING of padding
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static_assert(SIMDJSON_PADDING >= (BYTES_PROCESSED - 1), "backslash and quote finder must process fewer than SIMDJSON_PADDING bytes");
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simd8<uint8_t> v(src);
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// store to dest unconditionally - we can overwrite the bits we don't like later
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v.store(dst);
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return {
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static_cast<uint32_t>((v == '\\').to_bitmask()), // bs_bits
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static_cast<uint32_t>((v == '"').to_bitmask()), // quote_bits
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};
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}
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struct escaping {
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static constexpr uint32_t BYTES_PROCESSED = 32;
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simdjson_inline static escaping copy_and_find(const uint8_t *src, uint8_t *dst);
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simdjson_inline bool has_escape() { return escape_bits != 0; }
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simdjson_inline int escape_index() { return trailing_zeroes(escape_bits); }
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uint64_t escape_bits;
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}; // struct escaping
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simdjson_inline escaping escaping::copy_and_find(const uint8_t *src, uint8_t *dst) {
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static_assert(SIMDJSON_PADDING >= (BYTES_PROCESSED - 1), "escaping finder must process fewer than SIMDJSON_PADDING bytes");
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simd8<uint8_t> v(src);
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v.store(dst);
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simd8<bool> is_quote = (v == '"');
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simd8<bool> is_backslash = (v == '\\');
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simd8<bool> is_control = (v < 32);
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return {
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uint64_t((is_backslash | is_quote | is_control).to_bitmask())
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};
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}
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} // unnamed namespace
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} // namespace haswell
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} // namespace simdjson
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#endif // SIMDJSON_HASWELL_STRINGPARSING_DEFS_H
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