Mercurial
annotate third_party/luajit/dynasm/dasm_x86.h @ 197:0106cb67d958
env var ignore.
| author | MrJuneJune <me@mrjunejune.com> |
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| date | Sat, 14 Feb 2026 16:08:47 -0800 |
| parents | 94705b5986b3 |
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| rev | line source |
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1 /* |
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2 ** DynASM x86 encoding engine. |
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3 ** Copyright (C) 2005-2023 Mike Pall. All rights reserved. |
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4 ** Released under the MIT license. See dynasm.lua for full copyright notice. |
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5 */ |
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6 |
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7 #include <stddef.h> |
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8 #include <stdarg.h> |
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9 #include <string.h> |
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10 #include <stdlib.h> |
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11 |
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12 #define DASM_ARCH "x86" |
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13 |
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14 #ifndef DASM_EXTERN |
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15 #define DASM_EXTERN(a,b,c,d) 0 |
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16 #endif |
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17 |
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18 /* Action definitions. DASM_STOP must be 255. */ |
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19 enum { |
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20 DASM_DISP = 233, |
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21 DASM_IMM_S, DASM_IMM_B, DASM_IMM_W, DASM_IMM_D, DASM_IMM_WB, DASM_IMM_DB, |
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22 DASM_VREG, DASM_SPACE, DASM_SETLABEL, DASM_REL_A, DASM_REL_LG, DASM_REL_PC, |
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23 DASM_IMM_LG, DASM_IMM_PC, DASM_LABEL_LG, DASM_LABEL_PC, DASM_ALIGN, |
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24 DASM_EXTERN, DASM_ESC, DASM_MARK, DASM_SECTION, DASM_STOP |
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25 }; |
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26 |
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27 /* Maximum number of section buffer positions for a single dasm_put() call. */ |
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28 #define DASM_MAXSECPOS 25 |
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29 |
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30 /* DynASM encoder status codes. Action list offset or number are or'ed in. */ |
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31 #define DASM_S_OK 0x00000000 |
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32 #define DASM_S_NOMEM 0x01000000 |
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33 #define DASM_S_PHASE 0x02000000 |
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34 #define DASM_S_MATCH_SEC 0x03000000 |
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35 #define DASM_S_RANGE_I 0x11000000 |
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36 #define DASM_S_RANGE_SEC 0x12000000 |
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37 #define DASM_S_RANGE_LG 0x13000000 |
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38 #define DASM_S_RANGE_PC 0x14000000 |
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39 #define DASM_S_RANGE_VREG 0x15000000 |
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40 #define DASM_S_UNDEF_L 0x21000000 |
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41 #define DASM_S_UNDEF_PC 0x22000000 |
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42 |
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43 /* Macros to convert positions (8 bit section + 24 bit index). */ |
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44 #define DASM_POS2IDX(pos) ((pos)&0x00ffffff) |
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45 #define DASM_POS2BIAS(pos) ((pos)&0xff000000) |
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46 #define DASM_SEC2POS(sec) ((sec)<<24) |
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47 #define DASM_POS2SEC(pos) ((pos)>>24) |
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48 #define DASM_POS2PTR(D, pos) (D->sections[DASM_POS2SEC(pos)].rbuf + (pos)) |
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49 |
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50 /* Action list type. */ |
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51 typedef const unsigned char *dasm_ActList; |
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52 |
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53 /* Per-section structure. */ |
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54 typedef struct dasm_Section { |
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55 int *rbuf; /* Biased buffer pointer (negative section bias). */ |
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56 int *buf; /* True buffer pointer. */ |
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57 size_t bsize; /* Buffer size in bytes. */ |
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58 int pos; /* Biased buffer position. */ |
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59 int epos; /* End of biased buffer position - max single put. */ |
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60 int ofs; /* Byte offset into section. */ |
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61 } dasm_Section; |
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62 |
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63 /* Core structure holding the DynASM encoding state. */ |
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64 struct dasm_State { |
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65 size_t psize; /* Allocated size of this structure. */ |
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66 dasm_ActList actionlist; /* Current actionlist pointer. */ |
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67 int *lglabels; /* Local/global chain/pos ptrs. */ |
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68 size_t lgsize; |
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69 int *pclabels; /* PC label chains/pos ptrs. */ |
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70 size_t pcsize; |
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71 void **globals; /* Array of globals. */ |
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72 dasm_Section *section; /* Pointer to active section. */ |
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73 size_t codesize; /* Total size of all code sections. */ |
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74 int maxsection; /* 0 <= sectionidx < maxsection. */ |
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75 int status; /* Status code. */ |
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76 dasm_Section sections[1]; /* All sections. Alloc-extended. */ |
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77 }; |
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78 |
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79 /* The size of the core structure depends on the max. number of sections. */ |
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80 #define DASM_PSZ(ms) (sizeof(dasm_State)+(ms-1)*sizeof(dasm_Section)) |
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81 |
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82 |
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83 /* Initialize DynASM state. */ |
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84 void dasm_init(Dst_DECL, int maxsection) |
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85 { |
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86 dasm_State *D; |
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87 size_t psz = 0; |
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88 Dst_REF = NULL; |
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89 DASM_M_GROW(Dst, struct dasm_State, Dst_REF, psz, DASM_PSZ(maxsection)); |
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90 D = Dst_REF; |
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91 D->psize = psz; |
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92 D->lglabels = NULL; |
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93 D->lgsize = 0; |
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94 D->pclabels = NULL; |
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95 D->pcsize = 0; |
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96 D->globals = NULL; |
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97 D->maxsection = maxsection; |
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98 memset((void *)D->sections, 0, maxsection * sizeof(dasm_Section)); |
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99 } |
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100 |
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101 /* Free DynASM state. */ |
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102 void dasm_free(Dst_DECL) |
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103 { |
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104 dasm_State *D = Dst_REF; |
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105 int i; |
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106 for (i = 0; i < D->maxsection; i++) |
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107 if (D->sections[i].buf) |
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108 DASM_M_FREE(Dst, D->sections[i].buf, D->sections[i].bsize); |
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109 if (D->pclabels) DASM_M_FREE(Dst, D->pclabels, D->pcsize); |
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110 if (D->lglabels) DASM_M_FREE(Dst, D->lglabels, D->lgsize); |
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111 DASM_M_FREE(Dst, D, D->psize); |
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112 } |
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113 |
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114 /* Setup global label array. Must be called before dasm_setup(). */ |
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115 void dasm_setupglobal(Dst_DECL, void **gl, unsigned int maxgl) |
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116 { |
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117 dasm_State *D = Dst_REF; |
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118 D->globals = gl; |
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119 DASM_M_GROW(Dst, int, D->lglabels, D->lgsize, (10+maxgl)*sizeof(int)); |
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120 } |
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121 |
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122 /* Grow PC label array. Can be called after dasm_setup(), too. */ |
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123 void dasm_growpc(Dst_DECL, unsigned int maxpc) |
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124 { |
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125 dasm_State *D = Dst_REF; |
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126 size_t osz = D->pcsize; |
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127 DASM_M_GROW(Dst, int, D->pclabels, D->pcsize, maxpc*sizeof(int)); |
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128 memset((void *)(((unsigned char *)D->pclabels)+osz), 0, D->pcsize-osz); |
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129 } |
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130 |
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131 /* Setup encoder. */ |
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132 void dasm_setup(Dst_DECL, const void *actionlist) |
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133 { |
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134 dasm_State *D = Dst_REF; |
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135 int i; |
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136 D->actionlist = (dasm_ActList)actionlist; |
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137 D->status = DASM_S_OK; |
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138 D->section = &D->sections[0]; |
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139 memset((void *)D->lglabels, 0, D->lgsize); |
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140 if (D->pclabels) memset((void *)D->pclabels, 0, D->pcsize); |
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141 for (i = 0; i < D->maxsection; i++) { |
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142 D->sections[i].pos = DASM_SEC2POS(i); |
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143 D->sections[i].rbuf = D->sections[i].buf - D->sections[i].pos; |
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144 D->sections[i].ofs = 0; |
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145 } |
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146 } |
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147 |
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148 |
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149 #ifdef DASM_CHECKS |
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150 #define CK(x, st) \ |
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151 do { if (!(x)) { \ |
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152 D->status = DASM_S_##st|(int)(p-D->actionlist-1); return; } } while (0) |
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153 #define CKPL(kind, st) \ |
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154 do { if ((size_t)((char *)pl-(char *)D->kind##labels) >= D->kind##size) { \ |
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155 D->status=DASM_S_RANGE_##st|(int)(p-D->actionlist-1); return; } } while (0) |
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156 #else |
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157 #define CK(x, st) ((void)0) |
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158 #define CKPL(kind, st) ((void)0) |
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159 #endif |
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160 |
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161 /* Pass 1: Store actions and args, link branches/labels, estimate offsets. */ |
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162 void dasm_put(Dst_DECL, int start, ...) |
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163 { |
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164 va_list ap; |
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165 dasm_State *D = Dst_REF; |
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166 dasm_ActList p = D->actionlist + start; |
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167 dasm_Section *sec = D->section; |
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168 int pos = sec->pos, ofs = sec->ofs, mrm = -1; |
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169 int *b; |
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170 |
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171 if (pos >= sec->epos) { |
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172 DASM_M_GROW(Dst, int, sec->buf, sec->bsize, |
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173 sec->bsize + 2*DASM_MAXSECPOS*sizeof(int)); |
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174 sec->rbuf = sec->buf - DASM_POS2BIAS(pos); |
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175 sec->epos = (int)sec->bsize/sizeof(int) - DASM_MAXSECPOS+DASM_POS2BIAS(pos); |
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176 } |
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177 |
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178 b = sec->rbuf; |
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179 b[pos++] = start; |
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180 |
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181 va_start(ap, start); |
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182 while (1) { |
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183 int action = *p++; |
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184 if (action < DASM_DISP) { |
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185 ofs++; |
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186 } else if (action <= DASM_REL_A) { |
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187 int n = va_arg(ap, int); |
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188 b[pos++] = n; |
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189 switch (action) { |
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190 case DASM_DISP: |
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191 if (n == 0) { if (mrm < 0) mrm = p[-2]; if ((mrm&7) != 5) break; } |
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192 /* fallthrough */ |
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193 case DASM_IMM_DB: if (((n+128)&-256) == 0) goto ob; /* fallthrough */ |
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parents:
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194 case DASM_REL_A: /* Assumes ptrdiff_t is int. !x64 */ |
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195 case DASM_IMM_D: ofs += 4; break; |
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196 case DASM_IMM_S: CK(((n+128)&-256) == 0, RANGE_I); goto ob; |
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197 case DASM_IMM_B: CK((n&-256) == 0, RANGE_I); ob: ofs++; break; |
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198 case DASM_IMM_WB: if (((n+128)&-256) == 0) goto ob; /* fallthrough */ |
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199 case DASM_IMM_W: CK((n&-65536) == 0, RANGE_I); ofs += 2; break; |
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200 case DASM_SPACE: p++; ofs += n; break; |
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parents:
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201 case DASM_SETLABEL: b[pos-2] = -0x40000000; break; /* Neg. label ofs. */ |
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202 case DASM_VREG: CK((n&-16) == 0 && (n != 4 || (*p>>5) != 2), RANGE_VREG); |
|
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parents:
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203 if (*p < 0x40 && p[1] == DASM_DISP) mrm = n; |
|
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parents:
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204 if (*p < 0x20 && (n&7) == 4) ofs++; |
|
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parents:
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205 switch ((*p++ >> 3) & 3) { |
|
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parents:
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206 case 3: n |= b[pos-3]; /* fallthrough */ |
|
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parents:
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207 case 2: n |= b[pos-2]; /* fallthrough */ |
|
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parents:
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208 case 1: if (n <= 7) { b[pos-1] |= 0x10; ofs--; } |
|
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parents:
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209 } |
|
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parents:
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210 continue; |
|
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parents:
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211 } |
|
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parents:
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212 mrm = -1; |
|
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parents:
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213 } else { |
|
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parents:
diff
changeset
|
214 int *pl, n; |
|
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parents:
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|
215 switch (action) { |
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parents:
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|
216 case DASM_REL_LG: |
|
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parents:
diff
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|
217 case DASM_IMM_LG: |
|
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parents:
diff
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|
218 n = *p++; pl = D->lglabels + n; |
|
94705b5986b3
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parents:
diff
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|
219 /* Bkwd rel or global. */ |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
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|
220 if (n <= 246) { CK(n>=10||*pl<0, RANGE_LG); CKPL(lg, LG); goto putrel; } |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
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|
221 pl -= 246; n = *pl; |
|
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[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
changeset
|
222 if (n < 0) n = 0; /* Start new chain for fwd rel if label exists. */ |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
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|
223 goto linkrel; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
changeset
|
224 case DASM_REL_PC: |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
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|
225 case DASM_IMM_PC: pl = D->pclabels + va_arg(ap, int); CKPL(pc, PC); |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
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|
226 putrel: |
|
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parents:
diff
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|
227 n = *pl; |
|
94705b5986b3
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parents:
diff
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|
228 if (n < 0) { /* Label exists. Get label pos and store it. */ |
|
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parents:
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|
229 b[pos] = -n; |
|
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parents:
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|
230 } else { |
|
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[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
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|
231 linkrel: |
|
94705b5986b3
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parents:
diff
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|
232 b[pos] = n; /* Else link to rel chain, anchored at label. */ |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
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parents:
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|
233 *pl = pos; |
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parents:
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234 } |
|
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[ThirdParty] Added WRK and luajit for load testing.
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parents:
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|
235 pos++; |
|
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[ThirdParty] Added WRK and luajit for load testing.
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parents:
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|
236 ofs += 4; /* Maximum offset needed. */ |
|
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parents:
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|
237 if (action == DASM_REL_LG || action == DASM_REL_PC) { |
|
94705b5986b3
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parents:
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|
238 b[pos++] = ofs; /* Store pass1 offset estimate. */ |
|
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[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
239 } else if (sizeof(ptrdiff_t) == 8) { |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
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parents:
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|
240 ofs += 4; |
|
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parents:
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241 } |
|
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parents:
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|
242 break; |
|
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[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
243 case DASM_LABEL_LG: pl = D->lglabels + *p++; CKPL(lg, LG); goto putlabel; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
244 case DASM_LABEL_PC: pl = D->pclabels + va_arg(ap, int); CKPL(pc, PC); |
|
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[ThirdParty] Added WRK and luajit for load testing.
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parents:
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|
245 putlabel: |
|
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parents:
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|
246 n = *pl; /* n > 0: Collapse rel chain and replace with label pos. */ |
|
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[ThirdParty] Added WRK and luajit for load testing.
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parents:
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|
247 while (n > 0) { int *pb = DASM_POS2PTR(D, n); n = *pb; *pb = pos; } |
|
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parents:
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|
248 *pl = -pos; /* Label exists now. */ |
|
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[ThirdParty] Added WRK and luajit for load testing.
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parents:
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|
249 b[pos++] = ofs; /* Store pass1 offset estimate. */ |
|
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parents:
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250 break; |
|
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[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
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|
251 case DASM_ALIGN: |
|
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parents:
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252 ofs += *p++; /* Maximum alignment needed (arg is 2**n-1). */ |
|
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parents:
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253 b[pos++] = ofs; /* Store pass1 offset estimate. */ |
|
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parents:
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254 break; |
|
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parents:
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|
255 case DASM_EXTERN: p += 2; ofs += 4; break; |
|
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parents:
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|
256 case DASM_ESC: p++; ofs++; break; |
|
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parents:
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|
257 case DASM_MARK: mrm = p[-2]; break; |
|
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parents:
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|
258 case DASM_SECTION: |
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parents:
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259 n = *p; CK(n < D->maxsection, RANGE_SEC); D->section = &D->sections[n]; |
|
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[ThirdParty] Added WRK and luajit for load testing.
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parents:
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|
260 case DASM_STOP: goto stop; |
|
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[ThirdParty] Added WRK and luajit for load testing.
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parents:
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|
261 } |
|
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parents:
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|
262 } |
|
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parents:
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|
263 } |
|
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parents:
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|
264 stop: |
|
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[ThirdParty] Added WRK and luajit for load testing.
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parents:
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|
265 va_end(ap); |
|
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|
266 sec->pos = pos; |
|
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parents:
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|
267 sec->ofs = ofs; |
|
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parents:
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|
268 } |
|
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parents:
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|
269 #undef CK |
|
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parents:
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changeset
|
270 |
|
94705b5986b3
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parents:
diff
changeset
|
271 /* Pass 2: Link sections, shrink branches/aligns, fix label offsets. */ |
|
94705b5986b3
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parents:
diff
changeset
|
272 int dasm_link(Dst_DECL, size_t *szp) |
|
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parents:
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|
273 { |
|
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parents:
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|
274 dasm_State *D = Dst_REF; |
|
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parents:
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|
275 int secnum; |
|
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parents:
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|
276 int ofs = 0; |
|
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[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
changeset
|
277 |
|
94705b5986b3
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parents:
diff
changeset
|
278 #ifdef DASM_CHECKS |
|
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parents:
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|
279 *szp = 0; |
|
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[ThirdParty] Added WRK and luajit for load testing.
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parents:
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changeset
|
280 if (D->status != DASM_S_OK) return D->status; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
changeset
|
281 { |
|
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parents:
diff
changeset
|
282 int pc; |
|
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parents:
diff
changeset
|
283 for (pc = 0; pc*sizeof(int) < D->pcsize; pc++) |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
changeset
|
284 if (D->pclabels[pc] > 0) return DASM_S_UNDEF_PC|pc; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
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parents:
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|
285 } |
|
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parents:
diff
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|
286 #endif |
|
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parents:
diff
changeset
|
287 |
|
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[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
changeset
|
288 { /* Handle globals not defined in this translation unit. */ |
|
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[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
changeset
|
289 int idx; |
|
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parents:
diff
changeset
|
290 for (idx = 10; idx*sizeof(int) < D->lgsize; idx++) { |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
changeset
|
291 int n = D->lglabels[idx]; |
|
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[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
changeset
|
292 /* Undefined label: Collapse rel chain and replace with marker (< 0). */ |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
changeset
|
293 while (n > 0) { int *pb = DASM_POS2PTR(D, n); n = *pb; *pb = -idx; } |
|
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[ThirdParty] Added WRK and luajit for load testing.
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parents:
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|
294 } |
|
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parents:
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|
295 } |
|
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parents:
diff
changeset
|
296 |
|
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[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
changeset
|
297 /* Combine all code sections. No support for data sections (yet). */ |
|
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parents:
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|
298 for (secnum = 0; secnum < D->maxsection; secnum++) { |
|
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parents:
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changeset
|
299 dasm_Section *sec = D->sections + secnum; |
|
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parents:
diff
changeset
|
300 int *b = sec->rbuf; |
|
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parents:
diff
changeset
|
301 int pos = DASM_SEC2POS(secnum); |
|
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parents:
diff
changeset
|
302 int lastpos = sec->pos; |
|
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[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
changeset
|
303 |
|
94705b5986b3
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parents:
diff
changeset
|
304 while (pos != lastpos) { |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
changeset
|
305 dasm_ActList p = D->actionlist + b[pos++]; |
|
94705b5986b3
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parents:
diff
changeset
|
306 int op = 0; |
|
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parents:
diff
changeset
|
307 while (1) { |
|
94705b5986b3
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parents:
diff
changeset
|
308 int action = *p++; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
changeset
|
309 switch (action) { |
|
94705b5986b3
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MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
310 case DASM_REL_LG: p++; |
|
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parents:
diff
changeset
|
311 /* fallthrough */ |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
changeset
|
312 case DASM_REL_PC: { |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
313 int shrink = op == 0xe9 ? 3 : ((op&0xf0) == 0x80 ? 4 : 0); |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
314 if (shrink) { /* Shrinkable branch opcode? */ |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
315 int lofs, lpos = b[pos]; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
316 if (lpos < 0) goto noshrink; /* Ext global? */ |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
317 lofs = *DASM_POS2PTR(D, lpos); |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
318 if (lpos > pos) { /* Fwd label: add cumulative section offsets. */ |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
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parents:
diff
changeset
|
319 int i; |
|
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[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
320 for (i = secnum; i < DASM_POS2SEC(lpos); i++) |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
321 lofs += D->sections[i].ofs; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
322 } else { |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
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323 lofs -= ofs; /* Bkwd label: unfix offset. */ |
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324 } |
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325 lofs -= b[pos+1]; /* Short branch ok? */ |
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326 if (lofs >= -128-shrink && lofs <= 127) ofs -= shrink; /* Yes. */ |
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327 else { noshrink: shrink = 0; } /* No, cannot shrink op. */ |
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328 } |
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329 b[pos+1] = shrink; |
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330 pos += 2; |
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331 break; |
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332 } |
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333 /* fallthrough */ |
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334 case DASM_SPACE: case DASM_IMM_LG: case DASM_VREG: p++; |
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335 /* fallthrough */ |
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336 case DASM_DISP: case DASM_IMM_S: case DASM_IMM_B: case DASM_IMM_W: |
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337 case DASM_IMM_D: case DASM_IMM_WB: case DASM_IMM_DB: |
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338 case DASM_SETLABEL: case DASM_REL_A: case DASM_IMM_PC: pos++; break; |
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339 case DASM_LABEL_LG: p++; |
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340 /* fallthrough */ |
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341 case DASM_LABEL_PC: b[pos++] += ofs; break; /* Fix label offset. */ |
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342 case DASM_ALIGN: ofs -= (b[pos++]+ofs)&*p++; break; /* Adjust ofs. */ |
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343 case DASM_EXTERN: p += 2; break; |
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344 case DASM_ESC: op = *p++; break; |
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345 case DASM_MARK: break; |
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346 case DASM_SECTION: case DASM_STOP: goto stop; |
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347 default: op = action; break; |
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348 } |
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349 } |
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350 stop: (void)0; |
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351 } |
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352 ofs += sec->ofs; /* Next section starts right after current section. */ |
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353 } |
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354 |
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355 D->codesize = ofs; /* Total size of all code sections */ |
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356 *szp = ofs; |
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357 return DASM_S_OK; |
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358 } |
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359 |
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360 #define dasmb(x) *cp++ = (unsigned char)(x) |
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361 #ifndef DASM_ALIGNED_WRITES |
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362 #define dasmw(x) \ |
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363 do { *((unsigned short *)cp) = (unsigned short)(x); cp+=2; } while (0) |
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364 #define dasmd(x) \ |
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365 do { *((unsigned int *)cp) = (unsigned int)(x); cp+=4; } while (0) |
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366 #define dasmq(x) \ |
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367 do { *((unsigned long long *)cp) = (unsigned long long)(x); cp+=8; } while (0) |
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368 #else |
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369 #define dasmw(x) do { dasmb(x); dasmb((x)>>8); } while (0) |
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370 #define dasmd(x) do { dasmw(x); dasmw((x)>>16); } while (0) |
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371 #define dasmq(x) do { dasmd(x); dasmd((x)>>32); } while (0) |
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372 #endif |
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373 static unsigned char *dasma_(unsigned char *cp, ptrdiff_t x) |
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374 { |
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375 if (sizeof(ptrdiff_t) == 8) |
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376 dasmq((unsigned long long)x); |
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377 else |
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378 dasmd((unsigned int)x); |
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379 return cp; |
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380 } |
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381 #define dasma(x) (cp = dasma_(cp, (x))) |
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382 |
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383 /* Pass 3: Encode sections. */ |
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384 int dasm_encode(Dst_DECL, void *buffer) |
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385 { |
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386 dasm_State *D = Dst_REF; |
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387 unsigned char *base = (unsigned char *)buffer; |
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388 unsigned char *cp = base; |
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389 int secnum; |
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390 |
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parents:
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391 /* Encode all code sections. No support for data sections (yet). */ |
|
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392 for (secnum = 0; secnum < D->maxsection; secnum++) { |
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393 dasm_Section *sec = D->sections + secnum; |
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394 int *b = sec->buf; |
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395 int *endb = sec->rbuf + sec->pos; |
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|
396 |
|
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parents:
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397 while (b != endb) { |
|
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parents:
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398 dasm_ActList p = D->actionlist + *b++; |
|
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399 unsigned char *mark = NULL; |
|
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parents:
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400 while (1) { |
|
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parents:
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401 int action = *p++; |
|
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402 int n = (action >= DASM_DISP && action <= DASM_ALIGN) ? *b++ : 0; |
|
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parents:
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403 switch (action) { |
|
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parents:
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|
404 case DASM_DISP: if (!mark) mark = cp; { |
|
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parents:
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|
405 unsigned char *mm = mark; |
|
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parents:
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|
406 if (*p != DASM_IMM_DB && *p != DASM_IMM_WB) mark = NULL; |
|
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parents:
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407 if (n == 0) { int mrm = mm[-1]&7; if (mrm == 4) mrm = mm[0]&7; |
|
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parents:
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408 if (mrm != 5) { mm[-1] -= 0x80; break; } } |
|
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parents:
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409 if (((n+128) & -256) != 0) goto wd; else mm[-1] -= 0x40; |
|
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parents:
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|
410 } |
|
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parents:
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|
411 /* fallthrough */ |
|
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parents:
diff
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|
412 case DASM_IMM_S: case DASM_IMM_B: wb: dasmb(n); break; |
|
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parents:
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|
413 case DASM_IMM_DB: if (((n+128)&-256) == 0) { |
|
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parents:
diff
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|
414 db: if (!mark) mark = cp; mark[-2] += 2; mark = NULL; goto wb; |
|
94705b5986b3
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parents:
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|
415 } else mark = NULL; |
|
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parents:
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|
416 /* fallthrough */ |
|
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parents:
diff
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|
417 case DASM_IMM_D: wd: dasmd(n); break; |
|
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parents:
diff
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|
418 case DASM_IMM_WB: if (((n+128)&-256) == 0) goto db; else mark = NULL; |
|
94705b5986b3
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parents:
diff
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|
419 /* fallthrough */ |
|
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parents:
diff
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|
420 case DASM_IMM_W: dasmw(n); break; |
|
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parents:
diff
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|
421 case DASM_VREG: { |
|
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parents:
diff
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|
422 int t = *p++; |
|
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parents:
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|
423 unsigned char *ex = cp - (t&7); |
|
94705b5986b3
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parents:
diff
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|
424 if ((n & 8) && t < 0xa0) { |
|
94705b5986b3
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parents:
diff
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|
425 if (*ex & 0x80) ex[1] ^= 0x20 << (t>>6); else *ex ^= 1 << (t>>6); |
|
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parents:
diff
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|
426 n &= 7; |
|
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parents:
diff
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|
427 } else if (n & 0x10) { |
|
94705b5986b3
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parents:
diff
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|
428 if (*ex & 0x80) { |
|
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parents:
diff
changeset
|
429 *ex = 0xc5; ex[1] = (ex[1] & 0x80) | ex[2]; ex += 2; |
|
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MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
430 } |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
431 while (++ex < cp) ex[-1] = *ex; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
432 if (mark) mark--; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
433 cp--; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
434 n &= 7; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
435 } |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
436 if (t >= 0xc0) n <<= 4; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
437 else if (t >= 0x40) n <<= 3; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
438 else if (n == 4 && t < 0x20) { cp[-1] ^= n; *cp++ = 0x20; } |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
439 cp[-1] ^= n; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
440 break; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
441 } |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
442 case DASM_REL_LG: p++; if (n >= 0) goto rel_pc; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
443 b++; n = (int)(ptrdiff_t)D->globals[-n-10]; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
444 /* fallthrough */ |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
445 case DASM_REL_A: rel_a: |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
446 n -= (unsigned int)(ptrdiff_t)(cp+4); goto wd; /* !x64 */ |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
447 case DASM_REL_PC: rel_pc: { |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
448 int shrink = *b++; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
449 int *pb = DASM_POS2PTR(D, n); if (*pb < 0) { n = pb[1]; goto rel_a; } |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
450 n = *pb - ((int)(cp-base) + 4-shrink); |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
451 if (shrink == 0) goto wd; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
452 if (shrink == 4) { cp--; cp[-1] = *cp-0x10; } else cp[-1] = 0xeb; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
453 goto wb; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
454 } |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
455 case DASM_IMM_LG: |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
456 p++; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
457 if (n < 0) { dasma((ptrdiff_t)D->globals[-n-10]); break; } |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
458 /* fallthrough */ |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
459 case DASM_IMM_PC: { |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
460 int *pb = DASM_POS2PTR(D, n); |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
461 dasma(*pb < 0 ? (ptrdiff_t)pb[1] : (*pb + (ptrdiff_t)base)); |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
462 break; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
463 } |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
464 case DASM_LABEL_LG: { |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
465 int idx = *p++; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
466 if (idx >= 10) |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
467 D->globals[idx-10] = (void *)(base + (*p == DASM_SETLABEL ? *b : n)); |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
468 break; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
469 } |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
470 case DASM_LABEL_PC: case DASM_SETLABEL: break; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
471 case DASM_SPACE: { int fill = *p++; while (n--) *cp++ = fill; break; } |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
472 case DASM_ALIGN: |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
473 n = *p++; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
474 while (((cp-base) & n)) *cp++ = 0x90; /* nop */ |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
475 break; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
476 case DASM_EXTERN: n = DASM_EXTERN(Dst, cp, p[1], *p); p += 2; goto wd; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
477 case DASM_MARK: mark = cp; break; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
478 case DASM_ESC: action = *p++; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
479 /* fallthrough */ |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
480 default: *cp++ = action; break; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
481 case DASM_SECTION: case DASM_STOP: goto stop; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
482 } |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
483 } |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
484 stop: (void)0; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
485 } |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
486 } |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
487 |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
488 if (base + D->codesize != cp) /* Check for phase errors. */ |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
489 return DASM_S_PHASE; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
490 return DASM_S_OK; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
491 } |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
492 |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
493 /* Get PC label offset. */ |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
494 int dasm_getpclabel(Dst_DECL, unsigned int pc) |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
495 { |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
496 dasm_State *D = Dst_REF; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
497 if (pc*sizeof(int) < D->pcsize) { |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
498 int pos = D->pclabels[pc]; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
499 if (pos < 0) return *DASM_POS2PTR(D, -pos); |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
500 if (pos > 0) return -1; /* Undefined. */ |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
501 } |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
502 return -2; /* Unused or out of range. */ |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
503 } |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
504 |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
505 #ifdef DASM_CHECKS |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
506 /* Optional sanity checker to call between isolated encoding steps. */ |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
507 int dasm_checkstep(Dst_DECL, int secmatch) |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
508 { |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
509 dasm_State *D = Dst_REF; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
510 if (D->status == DASM_S_OK) { |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
511 int i; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
512 for (i = 1; i <= 9; i++) { |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
513 if (D->lglabels[i] > 0) { D->status = DASM_S_UNDEF_L|i; break; } |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
514 D->lglabels[i] = 0; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
515 } |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
516 } |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
517 if (D->status == DASM_S_OK && secmatch >= 0 && |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
518 D->section != &D->sections[secmatch]) |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
519 D->status = DASM_S_MATCH_SEC|(int)(D->section-D->sections); |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
520 return D->status; |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
521 } |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
522 #endif |
|
94705b5986b3
[ThirdParty] Added WRK and luajit for load testing.
MrJuneJune <me@mrjunejune.com>
parents:
diff
changeset
|
523 |