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annotate third_party/luajit/src/lj_str.c @ 201:6cdee35a7ba9

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[MrJuneJune] notes
author MrJuneJune <me@mrjunejune.com>
date Sun, 15 Feb 2026 07:07:50 -0800
parents 94705b5986b3
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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178
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1 /*
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2 ** String handling.
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3 ** Copyright (C) 2005-2023 Mike Pall. See Copyright Notice in luajit.h
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4 */
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5
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6 #define lj_str_c
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7 #define LUA_CORE
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8
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9 #include "lj_obj.h"
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10 #include "lj_gc.h"
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11 #include "lj_err.h"
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12 #include "lj_str.h"
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13 #include "lj_char.h"
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14 #include "lj_prng.h"
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15
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16 /* -- String helpers ------------------------------------------------------ */
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17
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18 /* Ordered compare of strings. Assumes string data is 4-byte aligned. */
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19 int32_t LJ_FASTCALL lj_str_cmp(GCstr *a, GCstr *b)
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20 {
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21 MSize i, n = a->len > b->len ? b->len : a->len;
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22 for (i = 0; i < n; i += 4) {
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23 /* Note: innocuous access up to end of string + 3. */
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24 uint32_t va = *(const uint32_t *)(strdata(a)+i);
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25 uint32_t vb = *(const uint32_t *)(strdata(b)+i);
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26 if (va != vb) {
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27 #if LJ_LE
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28 va = lj_bswap(va); vb = lj_bswap(vb);
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29 #endif
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30 i -= n;
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31 if ((int32_t)i >= -3) {
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32 va >>= 32+(i<<3); vb >>= 32+(i<<3);
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33 if (va == vb) break;
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34 }
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35 return va < vb ? -1 : 1;
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36 }
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37 }
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38 return (int32_t)(a->len - b->len);
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39 }
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40
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41 /* Find fixed string p inside string s. */
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42 const char *lj_str_find(const char *s, const char *p, MSize slen, MSize plen)
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43 {
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44 if (plen <= slen) {
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45 if (plen == 0) {
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46 return s;
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47 } else {
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48 int c = *(const uint8_t *)p++;
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49 plen--; slen -= plen;
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50 while (slen) {
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51 const char *q = (const char *)memchr(s, c, slen);
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52 if (!q) break;
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53 if (memcmp(q+1, p, plen) == 0) return q;
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54 q++; slen -= (MSize)(q-s); s = q;
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55 }
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56 }
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57 }
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58 return NULL;
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59 }
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60
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61 /* Check whether a string has a pattern matching character. */
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62 int lj_str_haspattern(GCstr *s)
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63 {
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64 const char *p = strdata(s), *q = p + s->len;
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65 while (p < q) {
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66 int c = *(const uint8_t *)p++;
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67 if (lj_char_ispunct(c) && strchr("^$*+?.([%-", c))
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68 return 1; /* Found a pattern matching char. */
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69 }
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70 return 0; /* No pattern matching chars found. */
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71 }
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72
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73 /* -- String hashing ------------------------------------------------------ */
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74
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75 /* Keyed sparse ARX string hash. Constant time. */
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76 static StrHash hash_sparse(uint64_t seed, const char *str, MSize len)
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77 {
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78 /* Constants taken from lookup3 hash by Bob Jenkins. */
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79 StrHash a, b, h = len ^ (StrHash)seed;
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80 if (len >= 4) { /* Caveat: unaligned access! */
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81 a = lj_getu32(str);
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82 h ^= lj_getu32(str+len-4);
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83 b = lj_getu32(str+(len>>1)-2);
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84 h ^= b; h -= lj_rol(b, 14);
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85 b += lj_getu32(str+(len>>2)-1);
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86 } else {
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87 a = *(const uint8_t *)str;
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88 h ^= *(const uint8_t *)(str+len-1);
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89 b = *(const uint8_t *)(str+(len>>1));
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90 h ^= b; h -= lj_rol(b, 14);
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91 }
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92 a ^= h; a -= lj_rol(h, 11);
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93 b ^= a; b -= lj_rol(a, 25);
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94 h ^= b; h -= lj_rol(b, 16);
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95 return h;
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96 }
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97
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98 #if LUAJIT_SECURITY_STRHASH
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99 /* Keyed dense ARX string hash. Linear time. */
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100 static LJ_NOINLINE StrHash hash_dense(uint64_t seed, StrHash h,
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101 const char *str, MSize len)
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102 {
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103 StrHash b = lj_bswap(lj_rol(h ^ (StrHash)(seed >> 32), 4));
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104 if (len > 12) {
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105 StrHash a = (StrHash)seed;
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106 const char *pe = str+len-12, *p = pe, *q = str;
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107 do {
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108 a += lj_getu32(p);
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109 b += lj_getu32(p+4);
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110 h += lj_getu32(p+8);
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111 p = q; q += 12;
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112 h ^= b; h -= lj_rol(b, 14);
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113 a ^= h; a -= lj_rol(h, 11);
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114 b ^= a; b -= lj_rol(a, 25);
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115 } while (p < pe);
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116 h ^= b; h -= lj_rol(b, 16);
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117 a ^= h; a -= lj_rol(h, 4);
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118 b ^= a; b -= lj_rol(a, 14);
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119 }
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120 return b;
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121 }
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122 #endif
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123
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124 /* -- String interning ---------------------------------------------------- */
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125
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126 #define LJ_STR_MAXCOLL 32
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127
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128 /* Resize the string interning hash table (grow and shrink). */
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parents:
diff changeset
129 void lj_str_resize(lua_State *L, MSize newmask)
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parents:
diff changeset
130 {
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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parents:
diff changeset
131 global_State *g = G(L);
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diff changeset
132 GCRef *newtab, *oldtab = g->str.tab;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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parents:
diff changeset
133 MSize i;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
134
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
135 /* No resizing during GC traversal or if already too big. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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parents:
diff changeset
136 if (g->gc.state == GCSsweepstring || newmask >= LJ_MAX_STRTAB-1)
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
137 return;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
138
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
139 newtab = lj_mem_newvec(L, newmask+1, GCRef);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
140 memset(newtab, 0, (newmask+1)*sizeof(GCRef));
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diff changeset
141
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
142 #if LUAJIT_SECURITY_STRHASH
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parents:
diff changeset
143 /* Check which chains need secondary hashes. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
144 if (g->str.second) {
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
145 int newsecond = 0;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
146 /* Compute primary chain lengths. */
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
147 for (i = g->str.mask; i != ~(MSize)0; i--) {
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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diff changeset
148 GCobj *o = (GCobj *)(gcrefu(oldtab[i]) & ~(uintptr_t)1);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
149 while (o) {
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MrJuneJune <me@mrjunejune.com>
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diff changeset
150 GCstr *s = gco2str(o);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
151 MSize hash = s->hashalg ? hash_sparse(g->str.seed, strdata(s), s->len) :
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MrJuneJune <me@mrjunejune.com>
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diff changeset
152 s->hash;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
153 hash &= newmask;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
154 setgcrefp(newtab[hash], gcrefu(newtab[hash]) + 1);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
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diff changeset
155 o = gcnext(o);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
156 }
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
157 }
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
158 /* Mark secondary chains. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
159 for (i = newmask; i != ~(MSize)0; i--) {
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
160 int secondary = gcrefu(newtab[i]) > LJ_STR_MAXCOLL;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
161 newsecond |= secondary;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
162 setgcrefp(newtab[i], secondary);
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MrJuneJune <me@mrjunejune.com>
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163 }
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MrJuneJune <me@mrjunejune.com>
parents:
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164 g->str.second = newsecond;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
165 }
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
166 #endif
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MrJuneJune <me@mrjunejune.com>
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167
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
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168 /* Reinsert all strings from the old table into the new table. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
169 for (i = g->str.mask; i != ~(MSize)0; i--) {
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
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170 GCobj *o = (GCobj *)(gcrefu(oldtab[i]) & ~(uintptr_t)1);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
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diff changeset
171 while (o) {
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MrJuneJune <me@mrjunejune.com>
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diff changeset
172 GCobj *next = gcnext(o);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
173 GCstr *s = gco2str(o);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
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174 MSize hash = s->hash;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
175 #if LUAJIT_SECURITY_STRHASH
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
176 uintptr_t u;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
177 if (LJ_LIKELY(!s->hashalg)) { /* String hashed with primary hash. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
178 hash &= newmask;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
179 u = gcrefu(newtab[hash]);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
180 if (LJ_UNLIKELY(u & 1)) { /* Switch string to secondary hash. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
181 s->hash = hash = hash_dense(g->str.seed, s->hash, strdata(s), s->len);
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MrJuneJune <me@mrjunejune.com>
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diff changeset
182 s->hashalg = 1;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
183 hash &= newmask;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
184 u = gcrefu(newtab[hash]);
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parents:
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185 }
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
186 } else { /* String hashed with secondary hash. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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parents:
diff changeset
187 MSize shash = hash_sparse(g->str.seed, strdata(s), s->len);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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parents:
diff changeset
188 u = gcrefu(newtab[shash & newmask]);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
189 if (u & 1) {
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
190 hash &= newmask;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
191 u = gcrefu(newtab[hash]);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
192 } else { /* Revert string back to primary hash. */
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
193 s->hash = shash;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
194 s->hashalg = 0;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
195 hash = (shash & newmask);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
196 }
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
197 }
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parents:
diff changeset
198 /* NOBARRIER: The string table is a GC root. */
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parents:
diff changeset
199 setgcrefp(o->gch.nextgc, (u & ~(uintptr_t)1));
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parents:
diff changeset
200 setgcrefp(newtab[hash], ((uintptr_t)o | (u & 1)));
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
201 #else
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
202 hash &= newmask;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
203 /* NOBARRIER: The string table is a GC root. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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parents:
diff changeset
204 setgcrefr(o->gch.nextgc, newtab[hash]);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
205 setgcref(newtab[hash], o);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
206 #endif
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
207 o = next;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
208 }
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
209 }
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
210
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
211 /* Free old table and replace with new table. */
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
212 lj_str_freetab(g);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
213 g->str.tab = newtab;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
214 g->str.mask = newmask;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
215 }
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
216
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
217 #if LUAJIT_SECURITY_STRHASH
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parents:
diff changeset
218 /* Rehash and rechain all strings in a chain. */
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parents:
diff changeset
219 static LJ_NOINLINE GCstr *lj_str_rehash_chain(lua_State *L, StrHash hashc,
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
220 const char *str, MSize len)
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
221 {
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
222 global_State *g = G(L);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
223 int ow = g->gc.state == GCSsweepstring ? otherwhite(g) : 0; /* Sweeping? */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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parents:
diff changeset
224 GCRef *strtab = g->str.tab;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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parents:
diff changeset
225 MSize strmask = g->str.mask;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
226 GCobj *o = gcref(strtab[hashc & strmask]);
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parents:
diff changeset
227 setgcrefp(strtab[hashc & strmask], (void *)((uintptr_t)1));
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
228 g->str.second = 1;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
229 while (o) {
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
230 uintptr_t u;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
231 GCobj *next = gcnext(o);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
232 GCstr *s = gco2str(o);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
233 StrHash hash;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
234 if (ow) { /* Must sweep while rechaining. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
235 if (((o->gch.marked ^ LJ_GC_WHITES) & ow)) { /* String alive? */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
236 lj_assertG(!isdead(g, o) || (o->gch.marked & LJ_GC_FIXED),
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
237 "sweep of undead string");
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
238 makewhite(g, o);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
239 } else { /* Free dead string. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
240 lj_assertG(isdead(g, o) || ow == LJ_GC_SFIXED,
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
241 "sweep of unlive string");
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
242 lj_str_free(g, s);
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
243 o = next;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
244 continue;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
245 }
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
246 }
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
247 hash = s->hash;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
248 if (!s->hashalg) { /* Rehash with secondary hash. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
249 hash = hash_dense(g->str.seed, hash, strdata(s), s->len);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
250 s->hash = hash;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
251 s->hashalg = 1;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
252 }
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
253 /* Rechain. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
254 hash &= strmask;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
255 u = gcrefu(strtab[hash]);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
256 setgcrefp(o->gch.nextgc, (u & ~(uintptr_t)1));
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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diff changeset
257 setgcrefp(strtab[hash], ((uintptr_t)o | (u & 1)));
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
258 o = next;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
259 }
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
260 /* Try to insert the pending string again. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
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diff changeset
261 return lj_str_new(L, str, len);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
262 }
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
263 #endif
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
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diff changeset
264
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
265 /* Reseed String ID from PRNG after random interval < 2^bits. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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266 #if LUAJIT_SECURITY_STRID == 1
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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267 #define STRID_RESEED_INTERVAL 8
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
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268 #elif LUAJIT_SECURITY_STRID == 2
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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269 #define STRID_RESEED_INTERVAL 4
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
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270 #elif LUAJIT_SECURITY_STRID >= 3
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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271 #define STRID_RESEED_INTERVAL 0
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272 #endif
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273
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MrJuneJune <me@mrjunejune.com>
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274 /* Allocate a new string and add to string interning table. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
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275 static GCstr *lj_str_alloc(lua_State *L, const char *str, MSize len,
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MrJuneJune <me@mrjunejune.com>
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276 StrHash hash, int hashalg)
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MrJuneJune <me@mrjunejune.com>
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diff changeset
277 {
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MrJuneJune <me@mrjunejune.com>
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diff changeset
278 GCstr *s = lj_mem_newt(L, lj_str_size(len), GCstr);
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MrJuneJune <me@mrjunejune.com>
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279 global_State *g = G(L);
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MrJuneJune <me@mrjunejune.com>
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280 uintptr_t u;
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MrJuneJune <me@mrjunejune.com>
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diff changeset
281 newwhite(g, s);
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MrJuneJune <me@mrjunejune.com>
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diff changeset
282 s->gct = ~LJ_TSTR;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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diff changeset
283 s->len = len;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
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diff changeset
284 s->hash = hash;
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MrJuneJune <me@mrjunejune.com>
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diff changeset
285 #ifndef STRID_RESEED_INTERVAL
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
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diff changeset
286 s->sid = g->str.id++;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
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diff changeset
287 #elif STRID_RESEED_INTERVAL
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
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diff changeset
288 if (!g->str.idreseed--) {
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
289 uint64_t r = lj_prng_u64(&g->prng);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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parents:
diff changeset
290 g->str.id = (StrID)r;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
291 g->str.idreseed = (uint8_t)(r >> (64 - STRID_RESEED_INTERVAL));
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
292 }
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
293 s->sid = g->str.id++;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
294 #else
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
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diff changeset
295 s->sid = (StrID)lj_prng_u64(&g->prng);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
296 #endif
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
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diff changeset
297 s->reserved = 0;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
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diff changeset
298 s->hashalg = (uint8_t)hashalg;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
299 /* Clear last 4 bytes of allocated memory. Implies zero-termination, too. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
300 *(uint32_t *)(strdatawr(s)+(len & ~(MSize)3)) = 0;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
301 memcpy(strdatawr(s), str, len);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
302 /* Add to string hash table. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
303 hash &= g->str.mask;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
304 u = gcrefu(g->str.tab[hash]);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
305 setgcrefp(s->nextgc, (u & ~(uintptr_t)1));
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
306 /* NOBARRIER: The string table is a GC root. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
307 setgcrefp(g->str.tab[hash], ((uintptr_t)s | (u & 1)));
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
308 if (g->str.num++ > g->str.mask) /* Allow a 100% load factor. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
309 lj_str_resize(L, (g->str.mask<<1)+1); /* Grow string table. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
310 return s; /* Return newly interned string. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
311 }
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
312
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
313 /* Intern a string and return string object. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
314 GCstr *lj_str_new(lua_State *L, const char *str, size_t lenx)
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
315 {
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
316 global_State *g = G(L);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
317 if (lenx-1 < LJ_MAX_STR-1) {
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
318 MSize len = (MSize)lenx;
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MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
319 StrHash hash = hash_sparse(g->str.seed, str, len);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
320 MSize coll = 0;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
321 int hashalg = 0;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
322 /* Check if the string has already been interned. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
323 GCobj *o = gcref(g->str.tab[hash & g->str.mask]);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
324 #if LUAJIT_SECURITY_STRHASH
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
325 if (LJ_UNLIKELY((uintptr_t)o & 1)) { /* Secondary hash for this chain? */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
326 hashalg = 1;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
327 hash = hash_dense(g->str.seed, hash, str, len);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
328 o = (GCobj *)(gcrefu(g->str.tab[hash & g->str.mask]) & ~(uintptr_t)1);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
329 }
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
330 #endif
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
331 while (o != NULL) {
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
332 GCstr *sx = gco2str(o);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
333 if (sx->hash == hash && sx->len == len) {
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
334 if (memcmp(str, strdata(sx), len) == 0) {
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
335 if (isdead(g, o)) flipwhite(o); /* Resurrect if dead. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
336 return sx; /* Return existing string. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
337 }
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
338 coll++;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
339 }
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
340 coll++;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
341 o = gcnext(o);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
342 }
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
343 #if LUAJIT_SECURITY_STRHASH
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
344 /* Rehash chain if there are too many collisions. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
345 if (LJ_UNLIKELY(coll > LJ_STR_MAXCOLL) && !hashalg) {
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
346 return lj_str_rehash_chain(L, hash, str, len);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
347 }
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
348 #endif
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
349 /* Otherwise allocate a new string. */
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
350 return lj_str_alloc(L, str, len, hash, hashalg);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
351 } else {
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
352 if (lenx)
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
353 lj_err_msg(L, LJ_ERR_STROV);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
354 return &g->strempty;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
355 }
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
356 }
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
357
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
358 void LJ_FASTCALL lj_str_free(global_State *g, GCstr *s)
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
359 {
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
360 g->str.num--;
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
361 lj_mem_free(g, s, lj_str_size(s->len));
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
362 }
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
363
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
364 void LJ_FASTCALL lj_str_init(lua_State *L)
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
365 {
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
366 global_State *g = G(L);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
367 g->str.seed = lj_prng_u64(&g->prng);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
368 lj_str_resize(L, LJ_MIN_STRTAB-1);
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
369 }
94705b5986b3 [ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff changeset
370