forked from simdjson/simdjson
-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathstringparsing.h
More file actions
46 lines (36 loc) · 1.57 KB
/
stringparsing.h
File metadata and controls
46 lines (36 loc) · 1.57 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
#ifndef SIMDJSON_HASWELL_STRINGPARSING_H
#define SIMDJSON_HASWELL_STRINGPARSING_H
#include "simdjson.h"
#include "haswell/simd.h"
#include "haswell/bitmanipulation.h"
namespace {
namespace SIMDJSON_IMPLEMENTATION {
using namespace simd;
// Holds backslashes and quotes locations.
struct backslash_and_quote {
public:
static constexpr uint32_t BYTES_PROCESSED = 32;
really_inline static backslash_and_quote copy_and_find(const uint8_t *src, uint8_t *dst);
really_inline bool has_quote_first() { return ((bs_bits - 1) & quote_bits) != 0; }
really_inline bool has_backslash() { return ((quote_bits - 1) & bs_bits) != 0; }
really_inline int quote_index() { return trailing_zeroes(quote_bits); }
really_inline int backslash_index() { return trailing_zeroes(bs_bits); }
uint32_t bs_bits;
uint32_t quote_bits;
}; // struct backslash_and_quote
really_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 {
(uint32_t)(v == '\\').to_bitmask(), // bs_bits
(uint32_t)(v == '"').to_bitmask(), // quote_bits
};
}
} // namespace SIMDJSON_IMPLEMENTATION
} // unnamed namespace
#include "generic/stage2/stringparsing.h"
#endif // SIMDJSON_HASWELL_STRINGPARSING_H