stringparsing_defs.h

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