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annotate third_party/luajit/src/host/buildvm_fold.c @ 279:b3b547563ec7
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Co-authored-by: Copilot <[email protected]>
Copilot-Session: 84c338fd-0939-4bb3-b7f3-1062eb213e5d
| author | MrJuneJune <me@mrjunejune.com> |
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| date | Mon, 17 Aug 2026 22:22:36 -0700 |
| parents | 94705b5986b3 |
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| rev | line source |
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1 /* |
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2 ** LuaJIT VM builder: IR folding hash table generator. |
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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 #include "buildvm.h" |
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7 #include "lj_obj.h" |
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8 #if LJ_HASJIT |
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9 #include "lj_ir.h" |
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10 |
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11 /* Context for the folding hash table generator. */ |
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12 static int lineno; |
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13 static uint32_t funcidx; |
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14 static uint32_t foldkeys[BUILD_MAX_FOLD]; |
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15 static uint32_t nkeys; |
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16 |
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17 /* Try to fill the hash table with keys using the hash parameters. */ |
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18 static int tryhash(uint32_t *htab, uint32_t sz, uint32_t r, int dorol) |
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19 { |
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20 uint32_t i; |
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21 if (dorol && ((r & 31) == 0 || (r>>5) == 0)) |
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22 return 0; /* Avoid zero rotates. */ |
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23 memset(htab, 0xff, (sz+1)*sizeof(uint32_t)); |
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24 for (i = 0; i < nkeys; i++) { |
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25 uint32_t key = foldkeys[i]; |
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26 uint32_t k = key & 0xffffff; |
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27 uint32_t h = (dorol ? lj_rol(lj_rol(k, r>>5) - k, r&31) : |
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28 (((k << (r>>5)) - k) << (r&31))) % sz; |
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29 if (htab[h] != 0xffffffff) { /* Collision on primary slot. */ |
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30 if (htab[h+1] != 0xffffffff) { /* Collision on secondary slot. */ |
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31 /* Try to move the colliding key, if possible. */ |
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32 if (h < sz-1 && htab[h+2] == 0xffffffff) { |
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33 uint32_t k2 = htab[h+1] & 0xffffff; |
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34 uint32_t h2 = (dorol ? lj_rol(lj_rol(k2, r>>5) - k2, r&31) : |
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35 (((k2 << (r>>5)) - k2) << (r&31))) % sz; |
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36 if (h2 != h+1) return 0; /* Cannot resolve collision. */ |
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37 htab[h+2] = htab[h+1]; /* Move colliding key to secondary slot. */ |
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38 } else { |
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39 return 0; /* Collision. */ |
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40 } |
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41 } |
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42 htab[h+1] = key; |
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43 } else { |
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44 htab[h] = key; |
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45 } |
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46 } |
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47 return 1; /* Success, all keys could be stored. */ |
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48 } |
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49 |
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50 /* Print the generated hash table. */ |
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51 static void printhash(BuildCtx *ctx, uint32_t *htab, uint32_t sz) |
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52 { |
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53 uint32_t i; |
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54 fprintf(ctx->fp, "static const uint32_t fold_hash[%d] = {\n0x%08x", |
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55 sz+1, htab[0]); |
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56 for (i = 1; i < sz+1; i++) |
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57 fprintf(ctx->fp, ",\n0x%08x", htab[i]); |
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58 fprintf(ctx->fp, "\n};\n\n"); |
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59 } |
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60 |
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61 /* Exhaustive search for the shortest semi-perfect hash table. */ |
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62 static void makehash(BuildCtx *ctx) |
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63 { |
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64 uint32_t htab[BUILD_MAX_FOLD*2+1]; |
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65 uint32_t sz, r; |
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66 /* Search for the smallest hash table with an odd size. */ |
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67 for (sz = (nkeys|1); sz < BUILD_MAX_FOLD*2; sz += 2) { |
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68 /* First try all shift hash combinations. */ |
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69 for (r = 0; r < 32*32; r++) { |
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70 if (tryhash(htab, sz, r, 0)) { |
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71 printhash(ctx, htab, sz); |
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72 fprintf(ctx->fp, |
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73 "#define fold_hashkey(k)\t(((((k)<<%u)-(k))<<%u)%%%u)\n\n", |
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74 r>>5, r&31, sz); |
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75 return; |
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76 } |
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77 } |
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78 /* Then try all rotate hash combinations. */ |
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79 for (r = 0; r < 32*32; r++) { |
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80 if (tryhash(htab, sz, r, 1)) { |
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81 printhash(ctx, htab, sz); |
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82 fprintf(ctx->fp, |
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83 "#define fold_hashkey(k)\t(lj_rol(lj_rol((k),%u)-(k),%u)%%%u)\n\n", |
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84 r>>5, r&31, sz); |
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85 return; |
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86 } |
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87 } |
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88 } |
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89 fprintf(stderr, "Error: search for perfect hash failed\n"); |
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90 exit(1); |
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91 } |
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92 |
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93 /* Parse one token of a fold rule. */ |
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94 static uint32_t nexttoken(char **pp, int allowlit, int allowany) |
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95 { |
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96 char *p = *pp; |
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97 if (p) { |
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98 uint32_t i; |
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99 char *q = strchr(p, ' '); |
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100 if (q) *q++ = '\0'; |
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101 *pp = q; |
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102 if (allowlit && !strncmp(p, "IRFPM_", 6)) { |
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103 for (i = 0; irfpm_names[i]; i++) |
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104 if (!strcmp(irfpm_names[i], p+6)) |
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105 return i; |
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106 } else if (allowlit && !strncmp(p, "IRFL_", 5)) { |
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107 for (i = 0; irfield_names[i]; i++) |
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108 if (!strcmp(irfield_names[i], p+5)) |
|
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109 return i; |
|
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110 } else if (allowlit && !strncmp(p, "IRCALL_", 7)) { |
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111 for (i = 0; ircall_names[i]; i++) |
|
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|
112 if (!strcmp(ircall_names[i], p+7)) |
|
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113 return i; |
|
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|
114 } else if (allowlit && !strncmp(p, "IRCONV_", 7)) { |
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115 for (i = 0; irt_names[i]; i++) { |
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116 const char *r = strchr(p+7, '_'); |
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117 if (r && !strncmp(irt_names[i], p+7, r-(p+7))) { |
|
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118 uint32_t j; |
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119 for (j = 0; irt_names[j]; j++) |
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120 if (!strcmp(irt_names[j], r+1)) |
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121 return (i << 5) + j; |
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122 } |
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123 } |
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124 } else if (allowlit && *p >= '0' && *p <= '9') { |
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125 for (i = 0; *p >= '0' && *p <= '9'; p++) |
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126 i = i*10 + (*p - '0'); |
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127 if (*p == '\0') |
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128 return i; |
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129 } else if (allowany && !strcmp("any", p)) { |
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130 return allowany; |
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131 } else { |
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132 for (i = 0; ir_names[i]; i++) |
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133 if (!strcmp(ir_names[i], p)) |
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134 return i; |
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135 } |
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136 fprintf(stderr, "Error: bad fold definition token \"%s\" at line %d\n", p, lineno); |
|
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137 exit(1); |
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138 } |
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139 return 0; |
|
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140 } |
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141 |
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|
142 /* Parse a fold rule. */ |
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143 static void foldrule(char *p) |
|
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144 { |
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145 uint32_t op = nexttoken(&p, 0, 0); |
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146 uint32_t left = nexttoken(&p, 0, 0x7f); |
|
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147 uint32_t right = nexttoken(&p, 1, 0x3ff); |
|
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148 uint32_t key = (funcidx << 24) | (op << 17) | (left << 10) | right; |
|
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149 uint32_t i; |
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150 if (nkeys >= BUILD_MAX_FOLD) { |
|
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151 fprintf(stderr, "Error: too many fold rules, increase BUILD_MAX_FOLD.\n"); |
|
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152 exit(1); |
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153 } |
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154 /* Simple insertion sort to detect duplicates. */ |
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155 for (i = nkeys; i > 0; i--) { |
|
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156 if ((foldkeys[i-1]&0xffffff) < (key & 0xffffff)) |
|
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157 break; |
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158 if ((foldkeys[i-1]&0xffffff) == (key & 0xffffff)) { |
|
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159 fprintf(stderr, "Error: duplicate fold definition at line %d\n", lineno); |
|
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160 exit(1); |
|
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161 } |
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162 foldkeys[i] = foldkeys[i-1]; |
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163 } |
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164 foldkeys[i] = key; |
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165 nkeys++; |
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166 } |
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167 |
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|
168 /* Emit C source code for IR folding hash table. */ |
|
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169 void emit_fold(BuildCtx *ctx) |
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170 { |
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171 char buf[256]; /* We don't care about analyzing lines longer than that. */ |
|
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172 const char *fname = ctx->args[0]; |
|
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|
173 FILE *fp; |
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174 |
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|
175 if (fname == NULL) { |
|
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176 fprintf(stderr, "Error: missing input filename\n"); |
|
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|
177 exit(1); |
|
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178 } |
|
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179 |
|
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parents:
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|
180 if (fname[0] == '-' && fname[1] == '\0') { |
|
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181 fp = stdin; |
|
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182 } else { |
|
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183 fp = fopen(fname, "r"); |
|
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|
184 if (!fp) { |
|
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185 fprintf(stderr, "Error: cannot open input file '%s': %s\n", |
|
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186 fname, strerror(errno)); |
|
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187 exit(1); |
|
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188 } |
|
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189 } |
|
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190 |
|
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parents:
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|
191 fprintf(ctx->fp, "/* This is a generated file. DO NOT EDIT! */\n\n"); |
|
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192 fprintf(ctx->fp, "static const FoldFunc fold_func[] = {\n"); |
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193 |
|
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194 lineno = 0; |
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195 funcidx = 0; |
|
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196 nkeys = 0; |
|
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197 while (fgets(buf, sizeof(buf), fp) != NULL) { |
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198 lineno++; |
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199 /* The prefix must be at the start of a line, otherwise it's ignored. */ |
|
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200 if (!strncmp(buf, FOLDDEF_PREFIX, sizeof(FOLDDEF_PREFIX)-1)) { |
|
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201 char *p = buf+sizeof(FOLDDEF_PREFIX)-1; |
|
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202 char *q = strchr(p, ')'); |
|
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parents:
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|
203 if (p[0] == '(' && q) { |
|
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204 p++; |
|
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205 *q = '\0'; |
|
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parents:
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|
206 foldrule(p); |
|
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parents:
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|
207 } else if ((p[0] == 'F' || p[0] == 'X') && p[1] == '(' && q) { |
|
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208 p += 2; |
|
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|
209 *q = '\0'; |
|
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210 if (funcidx) |
|
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parents:
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|
211 fprintf(ctx->fp, ",\n"); |
|
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parents:
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|
212 if (p[-2] == 'X') |
|
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parents:
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|
213 fprintf(ctx->fp, " %s", p); |
|
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parents:
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|
214 else |
|
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parents:
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|
215 fprintf(ctx->fp, " fold_%s", p); |
|
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parents:
diff
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|
216 funcidx++; |
|
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217 } else { |
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218 buf[strlen(buf)-1] = '\0'; |
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219 fprintf(stderr, "Error: unknown fold definition tag %s%s at line %d\n", |
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220 FOLDDEF_PREFIX, p, lineno); |
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221 exit(1); |
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222 } |
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223 } |
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224 } |
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225 fclose(fp); |
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226 fprintf(ctx->fp, "\n};\n\n"); |
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227 |
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228 makehash(ctx); |
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229 } |
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230 #else |
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231 void emit_fold(BuildCtx *ctx) |
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232 { |
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233 UNUSED(ctx); |
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234 } |
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235 #endif |
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236 |