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Regenerate the amalgamated headers

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Signed-off-by: Niels Lohmann <mail@nlohmann.me>
This commit is contained in:
Niels Lohmann committed 2026-10-11 10:28:29 +02:00
1 parent 3c2a32ae74
commit 3f81f42767
1 file changed
+640 -23
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single_include/nlohmann/json_view.hpp
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+640 -23
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@@ -27,6 +27,7 @@
#include <algorithm> // min
#include <array> // array
#include <cstddef> // nullptr_t, size_t // IWYU pragma: keep
#include <cstdint> // uint32_t
#include <cstring> // memcpy, strlen
#include <iterator> // distance, input_iterator_tag, iterator_traits
#include <map> // map
@@ -97,10 +98,12 @@
#include <array> // array
#include <cstddef> // size_t
#include <cstdint> // uint32_t
#include <cstring> // memcpy
#include <limits> // numeric_limits
#include <new> // bad_alloc, operator new, placement new
#include <string> // string
#include <vector> // vector
// #include <nlohmann/json.hpp>
// #include <nlohmann/detail/view/macro_scope.hpp>
@@ -236,7 +239,7 @@ struct node
{
std::uint8_t kind; ///< value_t
std::uint8_t flags; ///< node_flags
std::uint16_t extra; ///< numbers: integer digits (low byte) and fraction digits (high byte), 255 = "many"; otherwise 0
std::uint16_t extra; ///< numbers: integer digits (low byte) and fraction digits (high byte), 255 = "many"; objects: number of the hash index (1-based, 0 = none); otherwise 0
std::uint32_t off; ///< source offset (string content, number token, literal, bracket); arena offset if node_flags::escaped
std::uint32_t len; ///< string: decoded bytes; float: token bytes; array/object: element count
std::uint32_t next; ///< array/object: number of nodes of the subtree (its extent in the enclosing sequence)
@@ -317,6 +320,17 @@ struct document_data
std::size_t inline_cap = 0;
std::string arena; ///< decoded strings that contained escapes
std::string owned; ///< owned copy of the input, if any
// hash indexes of large objects (see object_index.hpp)
static constexpr std::uint32_t index_min_members = 128;
struct object_index
{
std::size_t start; ///< first slot in index_slots
std::uint32_t mask; ///< slot count - 1 (a power of two minus one)
};
std::vector<object_index> indexes;
std::vector<std::uint32_t> index_slots;
std::vector<std::uint32_t> large_objects; ///< positions of the objects to index (noted while parsing)
std::array<const char*, 4> base = {{nullptr, nullptr, nullptr, nullptr}}; ///< string bases: source, arena (indexed by flags & node_flags::storage)
bool discarded = true;
@@ -355,6 +369,9 @@ struct document_data
document_data() noexcept
: arena() // NOLINT(readability-redundant-member-init)
, owned() // NOLINT(readability-redundant-member-init)
, indexes() // NOLINT(readability-redundant-member-init)
, index_slots() // NOLINT(readability-redundant-member-init)
, large_objects() // NOLINT(readability-redundant-member-init)
{}
document_data(const document_data&) = delete;
document_data(document_data&&) = delete;
@@ -461,6 +478,348 @@ NLOHMANN_JSON_NAMESPACE_END
// #include <nlohmann/json.hpp>
// #include <nlohmann/detail/view/macro_scope.hpp>
// #include <nlohmann/detail/view/simd.hpp>
// __ _____ _____ _____
// __| | __| | | | JSON for Modern C++
// | | |__ | | | | | | version 3.12.0
// |_____|_____|_____|_|___| https://github.com/nlohmann/json
//
// SPDX-FileCopyrightText: 2013-2026 Niels Lohmann <https://nlohmann.me>
// SPDX-FileCopyrightText: 2018-2025 The simdjson authors <https://github.com/simdjson/simdjson>
// SPDX-License-Identifier: MIT
#include <array> // array
#include <atomic> // atomic
#include <cstddef> // size_t
#include <cstdint> // uint8_t, uint64_t
// #include <nlohmann/json.hpp>
// #include <nlohmann/detail/view/macro_scope.hpp>
// Vector code for long runs of string bytes. NEON (AArch64) and SSE2 (x86-64)
// belong to the baseline instruction sets and are used by default. The vector
// UTF-8 check needs NEON or SSSE3. SSSE3 is not part of x86-64, and the code
// must not depend on the flags of a translation unit (two translation units
// with different flags would have different definitions of the same inline
// functions): the check is compiled for SSSE3 with a function attribute and
// used where the CPU has SSSE3 (all x86-64 CPUs since about 2011), else the
// portable check. JSON_VIEW_USE_SSSE3 skips the CPU check (for code compiled
// for SSSE3 anyway); JSON_VIEW_NO_SIMD selects the portable code.
// NLOHMANN_VIEW_NO_TARGET_ATTRIBUTE (set by the GCC module interface, where GCC
// ignores the target attribute and then rejects the SSSE3 intrinsics) keeps the
// check portable without disabling the SSE2 code.
#if !defined(JSON_VIEW_NO_SIMD) && defined(__aarch64__) && (defined(__GNUC__) || defined(__clang__)) && NLOHMANN_VIEW_LITTLE_ENDIAN
#include <arm_neon.h>
#define NLOHMANN_VIEW_NEON 1
#else
#define NLOHMANN_VIEW_NEON 0
#endif
// (x86 only: other targets can define __SSE2__ as well, e.g., WebAssembly with -msse2, but have no <cpuid.h>)
#if !defined(JSON_VIEW_NO_SIMD) && !NLOHMANN_VIEW_NEON && (defined(__x86_64__) || defined(__i386__) || defined(_M_X64) || defined(_M_IX86)) && (defined(__SSE2__) || defined(_M_X64) || (defined(_M_IX86_FP) && _M_IX86_FP >= 2))
#include <emmintrin.h>
#define NLOHMANN_VIEW_SSE2 1
#else
#define NLOHMANN_VIEW_SSE2 0
#endif
#if NLOHMANN_VIEW_SSE2 && defined(JSON_VIEW_USE_SSSE3)
#include <tmmintrin.h>
#define NLOHMANN_VIEW_SSSE3 1 // NOLINT(cppcoreguidelines-macro-to-enum,modernize-macro-to-enum)
#else
#define NLOHMANN_VIEW_SSSE3 0 // NOLINT(cppcoreguidelines-macro-to-enum,modernize-macro-to-enum)
#endif
#if NLOHMANN_VIEW_SSE2 && !NLOHMANN_VIEW_SSSE3 && !defined(NLOHMANN_VIEW_NO_TARGET_ATTRIBUTE) && ((defined(__clang__) && __clang_major__ >= 4) || (defined(__GNUC__) && !defined(__clang__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 9))))
// (GCC before 4.9 has no SSSE3 intrinsics without -mssse3)
#include <cpuid.h>
#include <tmmintrin.h>
#define NLOHMANN_VIEW_SSSE3_DISPATCH 1 // NOLINT(cppcoreguidelines-macro-to-enum,modernize-macro-to-enum)
#define NLOHMANN_VIEW_SSSE3_TARGET __attribute__((target("ssse3")))
#elif NLOHMANN_VIEW_SSE2 && !NLOHMANN_VIEW_SSSE3 && defined(_MSC_VER)
// (MSVC compiles intrinsics of any instruction set)
#include <intrin.h>
#include <tmmintrin.h>
#define NLOHMANN_VIEW_SSSE3_DISPATCH 1 // NOLINT(cppcoreguidelines-macro-to-enum,modernize-macro-to-enum)
#define NLOHMANN_VIEW_SSSE3_TARGET
#else
#define NLOHMANN_VIEW_SSSE3_DISPATCH 0 // NOLINT(cppcoreguidelines-macro-to-enum,modernize-macro-to-enum)
#define NLOHMANN_VIEW_SSSE3_TARGET
#endif
#define NLOHMANN_VIEW_VECTOR (NLOHMANN_VIEW_NEON || NLOHMANN_VIEW_SSE2)
#define NLOHMANN_VIEW_VECTOR_UTF8 (NLOHMANN_VIEW_NEON || NLOHMANN_VIEW_SSSE3 || NLOHMANN_VIEW_SSSE3_DISPATCH)
NLOHMANN_JSON_NAMESPACE_BEGIN
namespace detail
{
namespace view
{
#if NLOHMANN_VIEW_VECTOR
/*!
@brief the first byte of a string run that is a quote, a backslash, a control
character, or not ASCII, 16 bytes per step
Stops at such a byte, or where fewer than 16 bytes are left (the caller tells
the two apart). A signed compare with 0x20 finds control characters and
non-ASCII bytes at once.
*/
NLOHMANN_VIEW_ALWAYS_INLINE const unsigned char* vector_plain_run(const unsigned char* p, const unsigned char* e) noexcept
{
while (e - p >= 16)
{
#if NLOHMANN_VIEW_NEON
const uint8x16_t in = vld1q_u8(p);
const uint8x16_t special = vorrq_u8(vorrq_u8(vceqq_u8(in, vdupq_n_u8('"')), vceqq_u8(in, vdupq_n_u8('\\'))),
vcltq_s8(vreinterpretq_s8_u8(in), vdupq_n_s8(0x20)));
// one nibble per byte (the usual NEON replacement of x86's movemask, see
// D. Kutenin, "Porting x86 vector bitmask optimizations to Arm NEON", 2022)
const std::uint64_t bits = vget_lane_u64(vreinterpret_u64_u8(vshrn_n_u16(vreinterpretq_u16_u8(special), 4)), 0);
if (bits != 0)
{
return p + (count_trailing_zeros(bits) >> 2u);
}
#else
const __m128i in = _mm_loadu_si128(static_cast<const __m128i*>(static_cast<const void*>(p))); // NOLINT(bugprone-casting-through-void)
const __m128i special = _mm_or_si128(_mm_or_si128(_mm_cmpeq_epi8(in, _mm_set1_epi8('"')), _mm_cmpeq_epi8(in, _mm_set1_epi8('\\'))),
_mm_cmplt_epi8(in, _mm_set1_epi8(0x20)));
const auto bits = static_cast<std::uint64_t>(static_cast<unsigned>(_mm_movemask_epi8(special)));
if (bits != 0)
{
return p + count_trailing_zeros(bits);
}
#endif
p += 16;
}
return p;
}
#endif
#if NLOHMANN_VIEW_SSSE3_DISPATCH
/// whether the CPU has SSSE3 (CPUID leaf 1, ECX bit 9)
inline bool cpu_ssse3() noexcept
{
#if defined(_MSC_VER) && !defined(__clang__)
std::array<int, 4> regs {{}};
__cpuid(regs.data(), 1);
return (static_cast<unsigned>(regs[2]) & (1u << 9u)) != 0;
#else
unsigned eax = 0;
unsigned ebx = 0;
unsigned ecx = 0;
unsigned edx = 0;
return __get_cpuid(1, &eax, &ebx, &ecx, &edx) != 0 && (ecx & (1u << 9u)) != 0;
#endif
}
/// whether the CPU has SSSE3, asked once: the answer is kept in an atomic
/// that is initialized at compile time, so that neither a guard of a local
/// static nor a global constructor is needed (threads that ask at the same
/// time all store the same answer)
NLOHMANN_VIEW_ALWAYS_INLINE bool cpu_has_ssse3() noexcept
{
static std::atomic<int> known{0}; // 0: not asked yet, 1: no, 2: yes
int state = known.load(std::memory_order_relaxed);
if (NLOHMANN_VIEW_UNLIKELY(state == 0))
{
state = cpu_ssse3() ? 2 : 1;
known.store(state, std::memory_order_relaxed);
}
return state == 2;
}
#endif
#if NLOHMANN_VIEW_VECTOR_UTF8
/// Tables of the UTF-8 check of J. Keiser and D. Lemire, "Validating UTF-8 In
/// Less Than One Instruction Per Byte" (2021), as in simdjson ("lookup4"): each
/// maps a nibble (high and low nibble of the previous byte, high nibble of the
/// current byte) to the errors it allows; a byte pair is ill-formed if all
/// three have an error bit in common.
template<typename Dummy = void>
struct utf8_lookup4
{
static constexpr std::uint8_t too_short = 1u << 0u, too_long = 1u << 1u, overlong_3 = 1u << 2u, too_large = 1u << 3u;
static constexpr std::uint8_t surrogate = 1u << 4u, overlong_2 = 1u << 5u, too_large_1000 = 1u << 6u, overlong_4 = 1u << 6u;
static constexpr std::uint8_t two_conts = 1u << 7u, carry = too_short | too_long | two_conts;
static const std::array<std::uint8_t, 16> byte_1_high;
static const std::array<std::uint8_t, 16> byte_1_low;
static const std::array<std::uint8_t, 16> byte_2_high;
};
template<typename Dummy>
const std::array<std::uint8_t, 16> utf8_lookup4<Dummy>::byte_1_high =
{
{
too_long, too_long, too_long, too_long, too_long, too_long, too_long, too_long,
two_conts, two_conts, two_conts, two_conts,
too_short | overlong_2, too_short, too_short | overlong_3 | surrogate, too_short | too_large | too_large_1000 | overlong_4
}
};
template<typename Dummy>
const std::array<std::uint8_t, 16> utf8_lookup4<Dummy>::byte_1_low =
{
{
carry | overlong_3 | overlong_2 | overlong_4, carry | overlong_2, carry, carry,
carry | too_large, carry | too_large | too_large_1000, carry | too_large | too_large_1000, carry | too_large | too_large_1000,
carry | too_large | too_large_1000, carry | too_large | too_large_1000, carry | too_large | too_large_1000, carry | too_large | too_large_1000,
carry | too_large | too_large_1000, carry | too_large | too_large_1000 | surrogate, carry | too_large | too_large_1000, carry | too_large | too_large_1000
}
};
template<typename Dummy>
const std::array<std::uint8_t, 16> utf8_lookup4<Dummy>::byte_2_high =
{
{
too_short, too_short, too_short, too_short, too_short, too_short, too_short, too_short,
static_cast<std::uint8_t>(too_long | overlong_2 | two_conts | overlong_3 | too_large_1000 | overlong_4),
static_cast<std::uint8_t>(too_long | overlong_2 | two_conts | overlong_3 | too_large),
static_cast<std::uint8_t>(too_long | overlong_2 | two_conts | surrogate | too_large),
static_cast<std::uint8_t>(too_long | overlong_2 | two_conts | surrogate | too_large),
too_short, too_short, too_short, too_short
}
};
/// the end of scan_string_vector from block, where the vector loop stopped
/// (ill-formed UTF-8, or fewer than 16 bytes left): one byte or sequence at a
/// time, from the start of a sequence that crosses into the block
inline const unsigned char* scan_string_finish(const unsigned char* p, const unsigned char* block, const unsigned char* e, const std::uint8_t* plain) noexcept
{
for (int i = 1; i <= 3 && block - i >= p; ++i)
{
const unsigned char c = block[-i];
if (c < 0x80)
{
break;
}
if (c >= 0xC0)
{
const int len = 2 + static_cast<int>(c >= 0xE0) + static_cast<int>(c >= 0xF0);
if (len > i)
{
block -= i;
}
break;
}
}
for (p = block; p != e;)
{
if (*p < 0x80)
{
if (plain[*p] == 0)
{
return p;
}
++p;
continue;
}
const std::size_t n = validate_one_utf8(p, static_cast<std::size_t>(e - p));
if (n == 0)
{
return p;
}
p += n;
}
return p;
}
/*!
@brief the rest of a string from p (a character boundary), 16 bytes per step
The first quote, backslash, or control character is found with vector
compares, and the UTF-8 check covers the bytes up to it. Returns where the
string scan stops, like scan_string_run: before ill-formed UTF-8 and for the
last bytes of the input, the bytes are checked one sequence at a time. Out of
line, so that no constants of the check occupy registers in the parse loop.
On x86-64, it is compiled for SSSE3 (see cpu_has_ssse3()).
*/
NLOHMANN_VIEW_SSSE3_TARGET NLOHMANN_VIEW_NOINLINE inline const unsigned char* scan_string_vector(const unsigned char* p, const unsigned char* e, const std::uint8_t* plain) noexcept
{
using lookup = utf8_lookup4<>;
const unsigned char* block = p;
#if NLOHMANN_VIEW_NEON
const uint8x16_t t1h = vld1q_u8(lookup::byte_1_high.data());
const uint8x16_t t1l = vld1q_u8(lookup::byte_1_low.data());
const uint8x16_t t2h = vld1q_u8(lookup::byte_2_high.data());
uint8x16_t prev = vdupq_n_u8(0);
while (e - block >= 16)
{
const uint8x16_t in = vld1q_u8(block);
const uint8x16_t special = vorrq_u8(vorrq_u8(vceqq_u8(in, vdupq_n_u8('"')), vceqq_u8(in, vdupq_n_u8('\\'))), vcltq_u8(in, vdupq_n_u8(0x20)));
const uint8x16_t prev1 = vextq_u8(prev, in, 15);
const uint8x16_t sc = vandq_u8(vandq_u8(vqtbl1q_u8(t1h, vshrq_n_u8(prev1, 4)), vqtbl1q_u8(t1l, vandq_u8(prev1, vdupq_n_u8(0x0F)))), vqtbl1q_u8(t2h, vshrq_n_u8(in, 4)));
const uint8x16_t must23 = vorrq_u8(vqsubq_u8(vextq_u8(prev, in, 14), vdupq_n_u8(0xE0 - 0x80)), vqsubq_u8(vextq_u8(prev, in, 13), vdupq_n_u8(0xF0 - 0x80)));
const uint8x16_t err = veorq_u8(vandq_u8(must23, vdupq_n_u8(0x80)), sc);
const std::uint64_t special_bits = vget_lane_u64(vreinterpret_u64_u8(vshrn_n_u16(vreinterpretq_u16_u8(special), 4)), 0);
const std::uint64_t err_bits = vget_lane_u64(vreinterpret_u64_u8(vshrn_n_u16(vreinterpretq_u16_u8(vtstq_u8(err, err)), 4)), 0);
if (special_bits != 0)
{
// errors up to the special byte count (an incomplete sequence
// before a quote shows at the quote); the bytes after it do not
const unsigned k = static_cast<unsigned>(count_trailing_zeros(special_bits)) >> 2u;
const std::uint64_t upto = k == 15 ? ~std::uint64_t{0} :
(std::uint64_t{1} << (4u * (k + 1u))) - 1u;
if ((err_bits & upto) == 0)
{
return block + k;
}
break;
}
if (err_bits != 0)
{
break;
}
prev = in;
block += 16;
}
#else
// the same with SSSE3 (pshufb for the table lookups; nibbles from 16-bit
// shifts, as there are no byte shifts)
const __m128i t1h = _mm_loadu_si128(static_cast<const __m128i*>(static_cast<const void*>(lookup::byte_1_high.data()))); // NOLINT(bugprone-casting-through-void)
const __m128i t1l = _mm_loadu_si128(static_cast<const __m128i*>(static_cast<const void*>(lookup::byte_1_low.data()))); // NOLINT(bugprone-casting-through-void)
const __m128i t2h = _mm_loadu_si128(static_cast<const __m128i*>(static_cast<const void*>(lookup::byte_2_high.data()))); // NOLINT(bugprone-casting-through-void)
const __m128i nibble = _mm_set1_epi8(0x0F);
const __m128i zero = _mm_setzero_si128();
__m128i prev = zero;
while (e - block >= 16)
{
const __m128i in = _mm_loadu_si128(static_cast<const __m128i*>(static_cast<const void*>(block))); // NOLINT(bugprone-casting-through-void)
const __m128i special = _mm_or_si128(_mm_or_si128(_mm_cmpeq_epi8(in, _mm_set1_epi8('"')), _mm_cmpeq_epi8(in, _mm_set1_epi8('\\'))),
_mm_cmpeq_epi8(_mm_subs_epu8(in, _mm_set1_epi8(0x1F)), zero)); // in < 0x20
const __m128i prev1 = _mm_alignr_epi8(in, prev, 15);
const __m128i sc = _mm_and_si128(_mm_and_si128(_mm_shuffle_epi8(t1h, _mm_and_si128(_mm_srli_epi16(prev1, 4), nibble)),
_mm_shuffle_epi8(t1l, _mm_and_si128(prev1, nibble))),
_mm_shuffle_epi8(t2h, _mm_and_si128(_mm_srli_epi16(in, 4), nibble)));
const __m128i must23 = _mm_or_si128(_mm_subs_epu8(_mm_alignr_epi8(in, prev, 14), _mm_set1_epi8(0xE0 - 0x80)),
_mm_subs_epu8(_mm_alignr_epi8(in, prev, 13), _mm_set1_epi8(0xF0 - 0x80)));
const __m128i err = _mm_xor_si128(_mm_and_si128(must23, _mm_set1_epi8(static_cast<char>(-128))), sc);
const auto special_bits = static_cast<unsigned>(_mm_movemask_epi8(special));
const auto err_bits = ~static_cast<unsigned>(_mm_movemask_epi8(_mm_cmpeq_epi8(err, zero))) & 0xFFFFu;
if (special_bits != 0)
{
const auto k = static_cast<unsigned>(count_trailing_zeros(static_cast<std::uint64_t>(special_bits)));
if ((err_bits & ((2u << k) - 1u)) == 0)
{
return block + k;
}
break;
}
if (err_bits != 0)
{
break;
}
prev = in;
block += 16;
}
#endif
return scan_string_finish(p, block, e, plain);
}
#endif
} // namespace view
} // namespace detail
NLOHMANN_JSON_NAMESPACE_END
// Scanning primitives of the view's parser. The unrolled checks at fixed
// offsets follow yyjson (https://github.com/ibireme/yyjson, MIT license): the
@@ -507,20 +866,45 @@ NLOHMANN_VIEW_ALWAYS_INLINE std::uint16_t load16(const unsigned char* p) noexcep
/// Advance over plain string bytes and well-formed UTF-8. Stops at a quote,
/// a backslash, a control character, ill-formed UTF-8, or the end. The first
/// 16 bytes are checked one by one, so that the position advances by
/// constants in predicted branches (most strings are short); longer runs
/// continue eight bytes at a time.
/// bytes are checked one by one, so that the position advances by constants
/// in predicted branches: 16 for keys, whose lengths repeat from record to
/// record, and 8 for string values (Value) where a vector loop follows, as
/// their lengths vary more. Longer runs continue 16 bytes at a time with NEON
/// or SSE2, else eight bytes at a time. With SSE2, the run is checked 16 bytes
/// at a time from its first byte instead: on x86-64, one compare that finds
/// the end of most keys and short values is faster than a branch per byte (on
/// AArch64, where a NEON mask costs more and branches predict well, slower).
template<bool Value = false>
NLOHMANN_VIEW_ALWAYS_INLINE const unsigned char* scan_string_run(const unsigned char* p, const unsigned char* e) noexcept
{
const std::uint8_t* plain = string_plain();
for (;;)
{
#if NLOHMANN_VIEW_SSE2
p = vector_plain_run(p, e);
#else
if (e - p >= 16)
{
#define NLOHMANN_VIEW_STEP(i) if (NLOHMANN_VIEW_LIKELY(plain[p[i]] != 0)) {} else { p += (i); goto stop; }
NLOHMANN_VIEW_REPEAT16(NLOHMANN_VIEW_STEP)
NLOHMANN_VIEW_STEP(0) NLOHMANN_VIEW_STEP(1) NLOHMANN_VIEW_STEP(2) NLOHMANN_VIEW_STEP(3)
NLOHMANN_VIEW_STEP(4) NLOHMANN_VIEW_STEP(5) NLOHMANN_VIEW_STEP(6) NLOHMANN_VIEW_STEP(7)
#if NLOHMANN_VIEW_VECTOR
if (!Value) // (a plain `!Value || !NLOHMANN_VIEW_VECTOR` is a constant condition for MSVC, C4127)
#endif
{
NLOHMANN_VIEW_STEP(8) NLOHMANN_VIEW_STEP(9) NLOHMANN_VIEW_STEP(10) NLOHMANN_VIEW_STEP(11)
NLOHMANN_VIEW_STEP(12) NLOHMANN_VIEW_STEP(13) NLOHMANN_VIEW_STEP(14) NLOHMANN_VIEW_STEP(15)
p += 8;
}
#undef NLOHMANN_VIEW_STEP
p += 16;
p += 8;
#if NLOHMANN_VIEW_VECTOR
p = vector_plain_run(p, e);
if (p != e && plain[*p] == 0)
{
goto stop;
}
#else
while (e - p >= 8)
{
const std::uint64_t special = swar_string_special(read_eight_bytes(p));
@@ -531,8 +915,10 @@ NLOHMANN_VIEW_ALWAYS_INLINE const unsigned char* scan_string_run(const unsigned
}
p += 8;
}
#endif
continue;
}
#endif
while (p != e && plain[*p] != 0)
{
++p;
@@ -541,11 +927,23 @@ NLOHMANN_VIEW_ALWAYS_INLINE const unsigned char* scan_string_run(const unsigned
{
return p;
}
#if !NLOHMANN_VIEW_SSE2
stop:
#endif
if (*p < 0x80)
{
return p; // quote, backslash, or control character
}
#if NLOHMANN_VIEW_VECTOR_UTF8
#if NLOHMANN_VIEW_SSSE3_DISPATCH
if (NLOHMANN_VIEW_LIKELY(cpu_has_ssse3()))
#endif
{
// non-ASCII: the vector check, out of line
return scan_string_vector(p, e, plain);
}
#endif
#if !NLOHMANN_VIEW_VECTOR_UTF8 || NLOHMANN_VIEW_SSSE3_DISPATCH
// non-ASCII: a run of well-formed sequences (the library's check, so
// that exactly what json::parse accepts is accepted)
do
@@ -558,6 +956,7 @@ stop:
p += n;
}
while (p != e && *p >= 0x80);
#endif
}
}
@@ -726,6 +1125,13 @@ class builder
frame shallow[64]; // NOLINT(cppcoreguidelines-avoid-c-arrays,hicpp-avoid-c-arrays,modernize-avoid-c-arrays): not initialized on purpose; filled as containers open
std::vector<frame> deep{};
/// remember an object to index after parsing (out of line, so that the
/// parse loop only has a call for it)
NLOHMANN_VIEW_NOINLINE void note_large_object(std::uint32_t idx)
{
doc.large_objects.push_back(idx);
}
NLOHMANN_VIEW_NOINLINE bool fail(error_code c, const unsigned char* at) noexcept
{
m_failure.code = c;
@@ -1121,7 +1527,7 @@ class builder
switch (cur()) \
{ \
case '"': \
if (NLOHMANN_VIEW_UNLIKELY(!string())) { return false; } \
if (NLOHMANN_VIEW_UNLIKELY(!string<true>())) { return false; } \
goto NEXT; \
case '{': \
open(value_t::object); \
@@ -1205,7 +1611,7 @@ obj_key:
{
return fail(error_code::expected_key);
}
if (NLOHMANN_VIEW_UNLIKELY(!string()))
if (NLOHMANN_VIEW_UNLIKELY(!string<false>()))
{
return false;
}
@@ -1246,19 +1652,27 @@ obj_next:
if (enabled(TrailingCommas) && cur() == '}')
{
++p;
goto close_container;
goto close_object;
}
goto obj_key;
}
if (cur() == '}')
{
++p;
goto close_container;
goto close_object;
}
return fail(error_code::expected_object_end);
#undef NLOHMANN_VIEW_VALUE
close_object:
// a large object gets a hash index (objects only, so that closing
// an array pays nothing for this)
if (NLOHMANN_VIEW_UNLIKELY(cur_count >= document_data::index_min_members))
{
cold.note_large_object(cur_idx);
}
close_container:
close();
if (NLOHMANN_VIEW_UNLIKELY(depth == 0))
@@ -1308,7 +1722,7 @@ root_done:
switch (cur())
{
case '"':
return string();
return string<true>();
case 't':
return literal("true", 4, value_t::boolean, node_flags::is_true);
case 'f':
@@ -1437,14 +1851,19 @@ indent_done:
const auto idx = static_cast<std::uint32_t>(n - base);
if (depth != 0)
{
const frame f = {cur_idx, cur_count, cur_is_object};
if (NLOHMANN_VIEW_LIKELY(depth <= 64))
{
cold.shallow[depth - 1] = f;
// field by field: a frame put together on the stack and
// copied would be read back wider than it was written,
// and that load waits until the stores are done
frame& f = cold.shallow[depth - 1];
f.idx = cur_idx;
f.count = cur_count;
f.is_object = cur_is_object;
}
else
{
cold.deep.push_back(f);
cold.deep.push_back(frame{cur_idx, cur_count, cur_is_object});
}
}
++depth;
@@ -1460,19 +1879,21 @@ indent_done:
n.next = static_cast<std::uint32_t>(out - base) - cur_idx;
if (--depth != 0)
{
frame f{};
if (NLOHMANN_VIEW_LIKELY(depth <= 64))
{
f = cold.shallow[depth - 1];
const frame& f = cold.shallow[depth - 1];
cur_idx = f.idx;
cur_count = f.count;
cur_is_object = f.is_object;
}
else
{
f = cold.deep.back();
const frame f = cold.deep.back();
cold.deep.pop_back();
cur_idx = f.idx;
cur_count = f.count;
cur_is_object = f.is_object;
}
cur_idx = f.idx;
cur_count = f.count;
cur_is_object = f.is_object;
}
}
@@ -1601,12 +2022,13 @@ indent_done:
return true;
}
/// a string (value or key) at p
/// a string at p: a value (Value) or a key
template<bool Value>
NLOHMANN_VIEW_ALWAYS_INLINE bool string()
{
++p; // opening quote
const unsigned char* const s = p;
p = scan_string_run(p, e);
p = scan_string_run<Value>(p, e);
if (NLOHMANN_VIEW_LIKELY(p != e && *p == '"'))
{
emit(value_t::string, 0, 0, static_cast<std::size_t>(s - b), static_cast<std::uint64_t>(p - s));
@@ -2467,6 +2889,170 @@ NLOHMANN_JSON_NAMESPACE_END
// #include <nlohmann/detail/view/node.hpp>
// #include <nlohmann/detail/view/object_index.hpp>
// __ _____ _____ _____
// __| | __| | | | JSON for Modern C++
// | | |__ | | | | | | version 3.12.0
// |_____|_____|_____|_|___| https://github.com/nlohmann/json
//
// SPDX-FileCopyrightText: 2013-2026 Niels Lohmann <https://nlohmann.me>
// SPDX-License-Identifier: MIT
#include <cstddef> // size_t
#include <cstdint> // uint32_t, uint64_t
#include <cstring> // memcmp
// #include <nlohmann/json.hpp>
// #include <nlohmann/detail/view/document_data.hpp>
// #include <nlohmann/detail/view/macro_scope.hpp>
// #include <nlohmann/detail/view/node.hpp>
// Hash indexes of large objects, so that a lookup does not compare thousands
// of keys (as Boost.JSON switches from a linear search to a hash table for
// large objects). An object with document_data::index_min_members members or
// more gets an open-addressing table after parsing; its node stores the
// number of the table (1-based) in `extra`. A slot holds the offset of a key
// node from its object node (0: empty). Of duplicate keys, the first is kept,
// as for the linear search.
//
// The hash is not seeded, so keys chosen to collide could make the build
// quadratic. A key therefore sits at most index_max_displacement slots away
// from its home slot; if a key would sit further away, the table is dropped
// and the object is searched linearly (like a small one). For the same
// reason, a lookup visits at most index_max_displacement + 1 slots.
NLOHMANN_JSON_NAMESPACE_BEGIN
namespace detail
{
namespace view
{
/// the farthest a key may sit from its home slot (a table with at most half of
/// its slots in use gives random keys a distance of about 50 for millions of
/// members; and every member costs at most this many steps while building)
constexpr std::size_t index_max_displacement = 64;
/// hash of a key: its bytes, eight at a time, in a fixed byte order
inline std::uint64_t key_hash(const char* s, std::size_t n) noexcept
{
std::uint64_t h = 0x9E3779B97F4A7C15u * (n + 1);
const auto* p = reinterpret_cast<const unsigned char*>(s); // NOLINT(cppcoreguidelines-pro-type-reinterpret-cast)
while (n >= 8)
{
h = (h ^ read_eight_bytes(p)) * 0xBF58476D1CE4E5B9u;
h ^= h >> 29u;
p += 8;
n -= 8;
}
std::uint64_t w = 0;
for (std::size_t i = 0; i < n; ++i)
{
w |= static_cast<std::uint64_t>(p[i]) << (8u * i);
}
h = (h ^ w) * 0x94D049BB133111EBu;
return h ^ (h >> 31u);
}
/// build the table of a large object
inline void build_object_index(document_data& d, node* obj)
{
if (d.indexes.size() >= 0xFFFFu)
{
return; // LCOV_EXCL_LINE (the number must fit `extra`; more large objects are searched linearly)
}
std::size_t cap = 16;
while (cap < 2 * static_cast<std::size_t>(obj->len))
{
cap *= 2;
}
const std::size_t start = d.index_slots.size();
d.index_slots.resize(start + cap, 0);
std::uint32_t* const slots = d.index_slots.data() + start;
const std::size_t mask = cap - 1;
bool degenerate = false;
for (const node* k = document_data::first_child(obj), *end = document_data::child_end(obj); k != end; k = document_data::after(k + 1))
{
const char* const key = d.str(*k);
const std::uint64_t hash = key_hash(key, k->len); // (a cast of the call would be useless where std::uint64_t is std::size_t)
std::size_t i = static_cast<std::size_t>(hash) & mask;
bool duplicate = false;
std::size_t distance = 0;
while (slots[i] != 0)
{
const node* const other = obj + slots[i];
if (other->len == k->len && (k->len == 0 || std::memcmp(d.str(*other), key, k->len) == 0))
{
duplicate = true; // keep the first
break;
}
if (++distance > index_max_displacement)
{
degenerate = true; // too many keys share a home region
break;
}
i = (i + 1) & mask;
}
if (degenerate)
{
break;
}
if (!duplicate)
{
slots[i] = static_cast<std::uint32_t>(k - obj);
}
}
if (degenerate)
{
d.index_slots.resize(start); // no table: the object is searched linearly
return;
}
d.indexes.push_back(document_data::object_index{start, static_cast<std::uint32_t>(mask)});
obj->extra = static_cast<std::uint16_t>(d.indexes.size());
}
/// build the tables of the large objects the parser noted
inline void build_object_indexes(document_data& d)
{
for (const std::uint32_t i : d.large_objects)
{
build_object_index(d, d.tape + i);
}
}
/// the key node of the first member with this key of an indexed object, or
/// nullptr
inline const node* find_indexed(const document_data& d, const node* obj, const char* key, std::size_t n) noexcept
{
const document_data::object_index& ix = d.indexes[obj->extra - 1u];
const std::uint32_t* const slots = d.index_slots.data() + ix.start;
const std::uint64_t hash = key_hash(key, n); // (a cast of the call would be useless where std::uint64_t is std::size_t)
std::size_t i = static_cast<std::size_t>(hash) & ix.mask;
for (std::size_t distance = 0; distance <= index_max_displacement; ++distance)
{
const std::uint32_t s = slots[i];
if (s == 0)
{
return nullptr;
}
const node* const k = obj + s;
if (k->len == n && (n == 0 || std::memcmp(d.str(*k), key, n) == 0))
{
return k;
}
i = (i + 1) & ix.mask;
}
return nullptr; // (no key sits further from its home slot)
}
} // namespace view
} // namespace detail
NLOHMANN_JSON_NAMESPACE_END
NLOHMANN_JSON_NAMESPACE_BEGIN
namespace detail
@@ -2538,6 +3124,10 @@ class short_key
/// their length, from the index alone
inline const node* find_member(const document_data& d, const node* object, const char* key, std::size_t n) noexcept
{
if (NLOHMANN_VIEW_UNLIKELY(object->extra != 0))
{
return find_indexed(d, object, key, n); // a large object
}
const node* const end = document_data::child_end(object);
const auto* const k = reinterpret_cast<const unsigned char*>(key); // NOLINT(cppcoreguidelines-pro-type-reinterpret-cast)
if (NLOHMANN_VIEW_LIKELY(n <= 16))
@@ -2915,6 +3505,8 @@ NLOHMANN_JSON_NAMESPACE_END
// #include <nlohmann/detail/view/node.hpp>
// #include <nlohmann/detail/view/object_index.hpp>
// #include <nlohmann/detail/view/pointer.hpp>
// __ _____ _____ _____
// __| | __| | | | JSON for Modern C++
@@ -4660,7 +5252,9 @@ class basic_json_document
}
return sizeof(document_data) + (m_data->inline_cap * sizeof(detail::view::node))
+ (m_data->tape != m_data->inline_tape ? m_data->tape_cap * sizeof(detail::view::node) : 0)
+ m_data->arena.capacity() + m_data->owned.capacity();
+ m_data->arena.capacity() + m_data->owned.capacity()
+ (m_data->indexes.capacity() * sizeof(document_data::object_index)) + (m_data->index_slots.capacity() * sizeof(std::uint32_t))
+ (m_data->large_objects.capacity() * sizeof(std::uint32_t));
}
/// release unused capacity of the index and the decoded strings; like
@@ -4681,6 +5275,8 @@ class basic_json_document
std::string arena(shrink_arena ? d.arena : std::string());
const bool shrink_tape = d.tape != d.inline_tape && d.tape_size != d.tape_cap;
const bool into_header = d.tape_size <= d.inline_cap;
std::vector<document_data::object_index> indexes(d.indexes.capacity() > d.indexes.size() ? d.indexes : std::vector<document_data::object_index>());
std::vector<std::uint32_t> index_slots(d.index_slots.capacity() > d.index_slots.size() ? d.index_slots : std::vector<std::uint32_t>());
node* fresh = (shrink_tape && !into_header) ? static_cast<node*>(::operator new (d.tape_size * sizeof(node))) : d.inline_tape;
if (shrink_tape)
@@ -4695,6 +5291,14 @@ class basic_json_document
d.arena.swap(arena);
d.base[1] = d.arena.data();
}
if (d.indexes.capacity() > d.indexes.size())
{
d.indexes.swap(indexes);
}
if (d.index_slots.capacity() > d.index_slots.size())
{
d.index_slots.swap(index_slots);
}
}
private:
@@ -4730,6 +5334,9 @@ class basic_json_document
d.size = size;
d.tape_size = 0;
d.arena.clear();
d.indexes.clear();
d.index_slots.clear();
d.large_objects.clear();
d.discarded = true;
detail::view::parse_failure failure;
bool ok = false;
@@ -4745,9 +5352,12 @@ class basic_json_document
{
d.base[0] = d.src;
d.base[1] = d.arena.data();
detail::view::build_object_indexes(d);
std::vector<std::uint32_t>().swap(d.large_objects); // (only needed while parsing)
d.discarded = false;
return;
}
std::vector<std::uint32_t>().swap(d.large_objects);
if (allow_exceptions)
{
detail::view::throw_parse_failure<BasicJsonType>(failure, src, size, comments, trailing_commas);
@@ -4912,6 +5522,13 @@ class tuple_element<N, ::nlohmann::detail::view::view_item<View>> // NOLINT(cert
#undef NLOHMANN_VIEW_THROW
#undef NLOHMANN_VIEW_LITTLE_ENDIAN
#undef NLOHMANN_VIEW_REPEAT16
#undef NLOHMANN_VIEW_NEON
#undef NLOHMANN_VIEW_SSE2
#undef NLOHMANN_VIEW_SSSE3
#undef NLOHMANN_VIEW_SSSE3_DISPATCH
#undef NLOHMANN_VIEW_SSSE3_TARGET
#undef NLOHMANN_VIEW_VECTOR
#undef NLOHMANN_VIEW_VECTOR_UTF8
// IWYU pragma: keep
#endif // INCLUDE_NLOHMANN_JSON_VIEW_HPP_