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1 /*
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2 * lwasm.c
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3 *
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4 * main code for lwasm
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5 */
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6
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7 #include <ctype.h>
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8 #include <errno.h>
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9 #include <stdio.h>
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10 #include <stdlib.h>
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11 #include <string.h>
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12 #define __lwasm_c_seen__
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13 #include "instab.h"
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14 #include "lwasm.h"
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15
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16 void lwasm_read_file(asmstate_t *as, char *fname);
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17 extern int add_macro_line(asmstate_t *as, sourceline_t *cl, char *optr);
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18 extern void expand_macro(asmstate_t *as, sourceline_t *cl, char **optr);
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19
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20 #define debug(mess, ...) do { if (as->debug) { fprintf(stderr, "DEBUG: "); fprintf(stderr, (mess), ## __VA_ARGS__); } } while (0)
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21
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22 void register_error(asmstate_t *as, sourceline_t *cl, int errcode)
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23 {
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24 errortab_t *e;
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25
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26 e = malloc(sizeof(errortab_t));
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27
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28 e -> errnum = errcode;
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29 e -> line = cl;
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30 e -> next = cl -> errors;
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31 cl -> errors = e;
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32
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33 as -> errorcount++;
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34 }
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35
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36 int eval_expr(asmstate_t *as, sourceline_t *cl, char **optr, int *val);
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37
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38 int eval_min(int v1, int v2, int v3, int v4)
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39 {
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40 if (v2 < v1)
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41 v1 = v2;
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42 if (v3 < v1)
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43 v1 = v3;
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44 if (v4 < v1)
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45 v1 = v4;
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46 return v1;
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47 }
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48
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49 int eval_max(int v1, int v2, int v3, int v4)
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50 {
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51 if (v2 > v1)
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52 v1 = v2;
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53 if (v3 > v1)
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54 v1 = v3;
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55 if (v4 > v1)
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56 v1 = v4;
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57 return v1;
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58 }
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59
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60 int lookupreg3(const char *rlist, char **str)
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61 {
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62 int rval = 0;
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63 int f = 0;
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64 const char *reglist = rlist;
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65
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66 while (*reglist)
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67 {
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68 if (toupper(**str) == *reglist)
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69 {
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70 // first char matches
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71 if (reglist[1] == ' ')
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72 {
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73 f = 1;
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74 break;
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75 }
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76 if (toupper(*(*str + 1)) == reglist[1])
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77 {
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78 // second char matches
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79 if (reglist[2] == ' ')
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80 {
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81 f = 1;
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82 break;
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83 }
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84 if (toupper(*(*str + 2)) == reglist[2])
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85 {
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86 f = 1;
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87 break;
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88 }
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89 }
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90 }
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91 reglist += 3;
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92 rval++;
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93 }
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94 if (f == 0)
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95 return -1;
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96
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97
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98 reglist = rval * 3 + rlist;
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99 if (reglist[1] == ' ')
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100 (*str) += 1;
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101 else if (reglist[2] == ' ')
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102 (*str) += 2;
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103 else
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104 (*str)+=3;
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105 return rval;
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106 }
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107
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108
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109 int lookupreg(const char *reglist, char **str)
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110 {
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111 int rval = 0;
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112 while (*reglist)
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113 {
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114 if (toupper(**str) == *reglist)
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115 {
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116 // first char matches
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117 if (reglist[1] == ' ' && !isalpha(*(*str + 1)))
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118 break;
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119 if (toupper(*(*str + 1)) == reglist[1])
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120 break;
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121 }
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122 reglist += 2;
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123 rval++;
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124 }
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125 if (!*reglist)
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126 return -1;
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127 if (reglist[1] == ' ')
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128 (*str)++;
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129 else
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130 (*str)+=2;
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131 return rval;
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132 }
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133
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134 void addcodebyte(asmstate_t *as, sourceline_t *cl, int cb)
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135 {
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136 cl -> len += 1;
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137 if (as -> passnum != 2)
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138 return;
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139
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140 if (cl -> numcodebytes >= cl -> codesize)
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141 {
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142 cl -> codebytes = realloc(cl -> codebytes, cl -> codesize + 32);
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143 cl -> codesize += 32;
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144 }
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145 debug("EMIT: %02x\n", cb & 0xff);
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146 cl -> codebytes[cl -> numcodebytes++] = cb & 0xFF;
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147 }
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148
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149 // parse a symble out of the line and return a pointer
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150 // to a static pointer
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151 // return NULL if not a symbol or a bad symbol
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152 char *parse_symbol(asmstate_t *as, char **ptr)
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153 {
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154 static char *symptr = NULL;
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155 char *tptr = *ptr;
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156 int sl = 0;
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157
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158 // symbol can start with _,a-z,A-Z
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159
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160 if (!strchr(SYMCHAR_START, **ptr))
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161 return NULL;
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162
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163 while (*tptr && !isspace(*tptr) && strchr(SYMCHAR, *tptr))
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164 {
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165 tptr++;
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166 sl++;
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167 }
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168
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169 symptr = realloc(symptr, sl + 1);
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170 tptr = symptr;
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171 while (sl)
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172 {
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173 *tptr++ = *(*ptr)++;
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174 sl--;
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175 }
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176 *tptr = '\0';
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177 return symptr;
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178 }
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179
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180 // resolve an instruction
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181 void resolve_insn(asmstate_t *as, sourceline_t *cl)
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182 {
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183 char *optr;
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184 char opbuf[MAX_OP_LEN + 1];
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185 char *symbol = NULL;
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186 int c;
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187
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188 cl -> code_symloc = as -> addr;
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189
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190 cl -> addrset = 0;
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191 cl -> isequ = 0;
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192 cl -> len = 0;
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193 cl -> undef = 0;
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194
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195 // only parse line on first pass
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196 if (as -> passnum == 1)
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197 {
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198 optr = cl -> line;
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199 if (!*optr || *optr == '*' || *optr == ';')
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200 {
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201 cl -> opcode = -1;
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202 cl -> remainder = cl -> line;
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203 return;
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204 }
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205
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206 if (!isspace(*optr))
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207 {
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208 symbol = parse_symbol(as, &optr);
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209 if (*optr && !isspace(*optr) && !(as -> inmacro))
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210 {
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211 errorp1(ERR_BADSYM);
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212 while (*optr && !isspace(*optr))
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213 optr++;
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214 }
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215 if (symbol)
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216 {
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217 cl -> symstr = strdup(symbol);
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218 cl -> hassym = 1;
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219 }
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220 }
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221
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222 while (isspace(*optr))
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223 optr++;
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224
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225 // parse opcode
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226 if (*optr && *optr != ';')
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227 {
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228 c = 0;
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229 while (c < MAX_OP_LEN && *optr && !isspace(*optr))
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230 {
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231 opbuf[c++] = *optr++;
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232 }
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233 opbuf[c] = '\0';
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234 if (*optr && !isspace(*optr) && !(as -> inmacro))
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235 {
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236 errorp1(ERR_BADOP);
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237 cl -> opcode = -1;
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238 }
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239 else
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240 {
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241 cl -> opcstr = strdup(opbuf);
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242 for (c = 0; instab[c].opcode; c++)
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243 {
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244 if (!strcasecmp(opbuf, instab[c].opcode))
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245 break;
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246 }
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247 if (!instab[c].opcode && opbuf[0] == '*')
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248 {
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249 cl -> opcode = -1;
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250 }
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251 else if (!instab[c].opcode && !(as -> inmacro))
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252 {
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253 cl -> opcode = -1;
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254
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255 // look up macro
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256 if (as -> macros)
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257 {
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258 macrotab_t *m;
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259
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260 for (m = as -> macros; m; m = m -> next)
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261 {
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262 if (!strcmp(m -> name, opbuf))
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263 break;
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264 }
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265 if (m)
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266 {
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267 // we have a macro here
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268 cl -> macro = m;
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269 while (*optr && isspace(*optr))
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270 optr++;
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271 expand_macro(as, cl, &optr);
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272 return;
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273 }
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274 else
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275 {
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276 errorp1(ERR_BADOP);
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277 }
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278 }
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279 else
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280 {
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281 errorp1(ERR_BADOP);
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282 }
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283 }
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284 else
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285 cl -> opcode = c;
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286 }
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287 }
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288 else
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289 cl -> opcode = -1;
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290
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291 if (as -> inmacro && cl -> opcode >= 0 && instab[cl -> opcode].specialnum != SPECIAL_ENDM)
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292 {
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293 add_macro_line(as, cl, cl -> line);
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294 cl -> opcode = -1;
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295 cl -> remainder = cl -> line;
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296 cl -> opcstr = NULL;
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297 cl -> operstr = NULL;
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298 cl -> symstr = NULL;
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299 cl -> hassym = 0;
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300 cl -> macrodef = 1;
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301 return;
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302 }
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303 // parse operand
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304 while (*optr && isspace(*optr))
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305 optr++;
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306
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307 cl -> operstr = optr;
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308 }
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309 else
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310 optr = cl -> operstr;
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311
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312 if (as -> skipcond)
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313 {
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314 // if skipping a condition, need to skip a macro
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315 if (cl -> opcode >= 0)
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316 {
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317 if (instab[cl -> opcode].specialnum == SPECIAL_MACRO)
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318 {
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319 as -> skipmacro = 1;
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320 }
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321 else if (instab[cl -> opcode].specialnum == SPECIAL_ENDM)
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322 {
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323 as -> skipmacro = 0;
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324 }
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325 else if (instab[cl -> opcode].specialnum == SPECIAL_COND && !(as -> skipmacro))
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326 {
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327 as -> skipcount++;
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328 }
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329 else if (instab[cl -> opcode].specialnum == SPECIAL_ENDC && !(as -> skipmacro))
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330 {
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331 as -> skipcount--;
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332 if (as -> skipcount <= 0)
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333 {
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334 as -> skipcond = 0;
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335 as -> noelse = 0;
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336 }
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337 }
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338 else if (instab[cl -> opcode].specialnum == SPECIAL_ELSE && !(as -> skipmacro))
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339 {
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340 if (as -> skipcount == 1)
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341 {
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342 as -> skipcount = 0;
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343 as -> skipcond = 0;
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344 as -> noelse = 1;
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345 return;
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346 }
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347 }
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348 }
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349 if (as -> skipcond)
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350 cl -> skipped = 1;
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351 return;
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352 }
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353
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354 // do the code thing
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355 // on pass 1, no code is generated
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356 // on pass 2, code is generated using the "emit()" macro
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357 if (cl -> opcode >= 0)
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358 {
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359 if (instab[cl -> opcode].opfn)
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360 {
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361 (*(instab[cl -> opcode].opfn))(as, cl, &optr);
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362 if (as -> passnum == 1)
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363 {
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364 if (*optr)
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365 {
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366 char *t = optr;
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367 char t2;
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368
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369 t2 = *optr;
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370 cl -> operstr = strdup(cl -> operstr);
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371 *optr = t2;
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372 while (*t && isspace(*t))
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373 t++;
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374 cl -> remainder = strdup(t);
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375
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376 }
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377 cl -> remainder = optr;
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378 }
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379 }
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380 else
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381 {
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382 errorp1(ERR_BADOP);
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383 cl -> opcode = -1;
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384 }
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385 }
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386 // address of the symbol may have been changed by a pseudo op
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387 // so we couldn't register it above
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388 // that means it may turn out to be a "forward ref" in pass 1
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389 if (cl -> hassym)
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390 {
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391 register_symbol(as, cl, cl -> symstr, cl -> code_symloc, cl -> isset ? SYMFLAG_SET : SYMFLAG_NONE);
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392 }
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393
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394 as -> addr += cl -> len;
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395 }
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396
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397 void generate_code(asmstate_t *as)
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398 {
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399 sourceline_t *cl;
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400
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401 as -> addr = 0;
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402 as -> dpval = 0;
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403 as -> passnum = 2;
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404 for (cl = as -> source_head; cl; cl = cl -> next)
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405 {
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406 resolve_insn(as, cl);
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407 }
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408 }
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409
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410 void lwasm_read_file(asmstate_t *as, char *fname)
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411 {
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412 FILE *f;
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413 int cline = 0;
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414 sourceline_t *cl;
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415 size_t bufflen;
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416 char *buff = NULL;
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417 int retval;
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418
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419 as -> passnum = 1;
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420
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421 f = fopen(fname, "r");
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422 if (!f)
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423 {
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424 fprintf(stderr, "Cannot open input file %s: %s\n", fname, strerror(errno));
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425 return;
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426 }
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427
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428 while (!feof(f))
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429 {
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430 retval = getline(&buff, &bufflen, f);
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431 debug(" read line (%s:%d): %s\n", fname, cline, buff);
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432 if (retval < 0)
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433 {
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434 if (feof(f))
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435 break;
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436 fprintf(stderr, "Error reading '%s': %s\n", fname, strerror(errno));
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437 exit(1);
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438 }
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439 if (strchr(buff, '\n'))
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440 *strchr(buff, '\n') = '\0';
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441 if (strchr(buff, '\r'))
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442 *strchr(buff, '\r') = '\0';
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443 cl = calloc(sizeof(sourceline_t), 1);
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444 if (!cl)
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445 {
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446 perror("Malloc");
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447 exit(1);
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448 }
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449
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450 cl -> lineno = cline++;
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451 cl -> sourcefile = fname;
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452 cl -> opcode = -1;
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453 cl -> addrmode = -1;
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454 cl -> addr = as -> addr;
|
|
|
455 cl -> dpval = as -> dpval;
|
|
|
456 cl -> prev = as -> source_tail;
|
|
|
457 if (as -> source_tail)
|
|
|
458 as -> source_tail -> next = cl;
|
|
|
459 as -> source_tail = cl;
|
|
|
460 if (as -> source_head == NULL)
|
|
|
461 as -> source_head = cl;
|
|
|
462 cl -> line = strdup(buff);
|
|
|
463
|
|
|
464 resolve_insn(as, cl);
|
|
|
465
|
|
|
466 if (cl -> opcode >= 0 && instab[cl -> opcode].instype == INSTYPE_PSEUDO && instab[cl -> opcode].specialnum == SPECIAL_END)
|
|
|
467 break;
|
|
|
468
|
|
|
469 *buff = '\0';
|
|
|
470
|
|
|
471 }
|
|
|
472 if (buff)
|
|
|
473 free(buff);
|
|
|
474
|
|
|
475 fclose(f);
|
|
|
476
|
|
|
477 return;
|
|
|
478 }
|
|
|
479
|
|
|
480 /*
|
|
|
481 below this point is the expression evaluation package
|
|
|
482
|
|
|
483 Supported binary operators: + - / * %
|
|
|
484 Supported unary operators: -
|
|
|
485
|
|
|
486 <infix>: + | - | * | / | %
|
|
|
487 <unary>: -
|
|
|
488 <expr>: <term> <infix> <term>
|
|
|
489 <term>: <unary> <term>
|
|
|
490 <term>: ( <expr> )
|
|
|
491 <term>: <symbol>
|
|
|
492 <term>: ' <char>
|
|
|
493 <term>: " <char> <char>
|
|
|
494 <term>: *
|
|
|
495 <term>: <number>
|
|
|
496
|
|
|
497 <number>: <dec>
|
|
|
498 <number>: & <dec>
|
|
|
499
|
|
|
500 <number>: $ <hex>
|
|
|
501 <number>: <hex> H
|
|
|
502 <number>: @ <oct>
|
|
|
503 <number>: <oct> O
|
|
|
504 <number>: <oct> Q
|
|
|
505
|
|
|
506 <number>: % <bin>
|
|
|
507 <number>: <bin> B
|
|
|
508
|
|
|
509 <bin>: 0 | 1
|
|
|
510 <oct>: <bin> | 2 | 3 | 4 | 5 | 6 | 7
|
|
|
511 <dec>: <oct> | 8 | 9
|
|
|
512 <hex>: <dec> | A | B | C | D | E | F
|
|
|
513
|
|
|
514 NOTE: hex values which start with a non-digit will need to be prefixed
|
|
|
515 by $ or have a 0 as the leading digit; hence: $CC or 0CCH otherwise the
|
|
|
516 assembler cannot tell the difference between CCH as a symbol or CCH as
|
|
|
517 the value $CC
|
|
|
518
|
|
|
519 */
|
|
|
520
|
|
|
521 // will throw an error and return 0 in tval if there's a problem
|
|
|
522 // -1 is problem; cl -> undef set is undefined symbol
|
|
|
523 int eval_term(asmstate_t *as, sourceline_t *cl, char **optr, int *tval)
|
|
|
524 {
|
|
|
525 char tc;
|
|
|
526 int rval;
|
|
|
527 int binval;
|
|
|
528 int octval;
|
|
|
529 int decval;
|
|
|
530 int hexval;
|
|
|
531 int valtype;
|
|
|
532 int digval;
|
|
|
533 int bindone = 0;
|
|
|
534
|
|
|
535 *tval = 0;
|
|
|
536
|
|
|
537 beginagain:
|
|
|
538 tc = **optr;
|
|
|
539 if (tc == '+')
|
|
|
540 {
|
|
|
541 // unary +, ignored for symetry
|
|
|
542 (*optr)++;
|
|
|
543 goto beginagain;
|
|
|
544 }
|
|
|
545
|
|
|
546 if (tc == '(')
|
|
|
547 {
|
|
|
548 (*optr)++;
|
|
|
549 rval = eval_expr(as, cl, optr, tval);
|
|
|
550 if (rval < 0)
|
|
|
551 return rval;
|
|
|
552 if (**optr != ')')
|
|
|
553 {
|
|
|
554 errorp1(ERR_BADEXPR);
|
|
|
555 return -1;
|
|
|
556 }
|
|
|
557 (*optr)++;
|
|
|
558 return 0;
|
|
|
559 }
|
|
|
560
|
|
|
561 if (tc == '-')
|
|
|
562 {
|
|
|
563 (*optr)++;
|
|
|
564 rval = eval_term(as, cl, optr, tval);
|
|
|
565 if (rval < 0)
|
|
|
566 return rval;
|
|
|
567 *tval = -*tval;
|
|
|
568 return 0;
|
|
|
569 }
|
|
|
570
|
|
|
571 // current address (of current instruction, not PC)
|
|
|
572 if (tc == '*')
|
|
|
573 {
|
|
|
574 *tval = cl -> addr;
|
|
|
575 (*optr)++;
|
|
|
576 return 0;
|
|
|
577 }
|
|
|
578
|
|
|
579 if (strchr("abcdefghijklmnopqrstuvwxyz_", tolower(tc)))
|
|
|
580 {
|
|
|
581 // evaluate a symbol
|
|
|
582 char *symbuf;
|
|
|
583
|
|
|
584 symbuf = parse_symbol(as, optr);
|
|
|
585 if (!symbuf)
|
|
|
586 {
|
|
|
587 errorp1(ERR_BADSYM);
|
|
|
588 *tval = 0;
|
|
|
589 return -1;
|
|
|
590 }
|
|
|
591
|
|
|
592 debug(" looking up symbol: %s\n", symbuf);
|
|
|
593 *tval = lookup_symbol(as, symbuf);
|
|
|
594
|
|
|
595 // if not found, flag forward ref
|
|
|
596 if (*tval == -1)
|
|
|
597 {
|
|
|
598 errorp2(ERR_UNDEF);
|
|
|
599 cl -> undef = 1;
|
|
|
600 *tval = 0;
|
|
|
601 return 0;
|
|
|
602 }
|
|
|
603 return 0;
|
|
|
604 }
|
|
|
605
|
|
|
606 if (tc == '%')
|
|
|
607 {
|
|
|
608 // binary number
|
|
|
609 int v1 = 0;
|
|
|
610 (*optr)++;
|
|
|
611 while (strchr("01", **optr))
|
|
|
612 {
|
|
|
613 v1 = v1 << 1 | ((*(*optr)++) - '0');
|
|
|
614 }
|
|
|
615 *tval = v1;
|
|
|
616 return 0;
|
|
|
617 }
|
|
|
618 if (tc == '$')
|
|
|
619 {
|
|
|
620 // hex number
|
|
|
621 int v1 = 0;
|
|
|
622 (*optr)++;
|
|
|
623 debug("HEX CONST: %s\n", *optr);
|
|
|
624 while (**optr && strchr("01234567890ABCDEF", toupper(tc = **optr)))
|
|
|
625 {
|
|
|
626 debug("HEX 2: %02x\n", tc);
|
|
|
627 if (**optr >= 'A')
|
|
|
628 {
|
|
|
629 v1 = v1 << 4 | (toupper((*(*optr)++)) - 'A' + 10);
|
|
|
630 }
|
|
|
631 else
|
|
|
632 {
|
|
|
633 v1 = v1 << 4 | ((*(*optr)++) - '0');
|
|
|
634 }
|
|
|
635 }
|
|
|
636 *tval = v1;
|
|
|
637 return 0;
|
|
|
638 }
|
|
|
639 if (tc == '@')
|
|
|
640 {
|
|
|
641 // octal number
|
|
|
642 int v1 = 0;
|
|
|
643 (*optr)++;
|
|
|
644 while (strchr("01234567", **optr))
|
|
|
645 {
|
|
|
646 v1 = v1 << 3 | ((*(*optr)++) - '0');
|
|
|
647 }
|
|
|
648 *tval = v1;
|
|
|
649 return 0;
|
|
|
650 }
|
|
|
651 if (tc == '&')
|
|
|
652 {
|
|
|
653 // decimal number
|
|
|
654 int v1 = 0;
|
|
|
655 (*optr)++;
|
|
|
656 while (strchr("0123456789", **optr))
|
|
|
657 {
|
|
|
658 v1 = v1 * 10 + ((*(*optr)++) - '0');
|
|
|
659 }
|
|
|
660 *tval = v1;
|
|
|
661 return 0;
|
|
|
662 }
|
|
|
663 if (tc == '\'')
|
|
|
664 {
|
|
|
665 (*optr)++;
|
|
|
666 if (!**optr)
|
|
|
667 {
|
|
|
668 errorp1(ERR_BADEXPR);
|
|
|
669 return -2;
|
|
|
670 }
|
|
|
671 *tval = *(*optr)++;
|
|
|
672 return 0;
|
|
|
673 }
|
|
|
674 if (tc == '"')
|
|
|
675 {
|
|
|
676 (*optr)++;
|
|
|
677 if (!**optr || !*(*optr + 1))
|
|
|
678 {
|
|
|
679 errorp1(ERR_BADEXPR);
|
|
|
680 return -2;
|
|
|
681 }
|
|
|
682 *tval = *(*optr)++ << 8 | *(*optr)++;
|
|
|
683 return 0;
|
|
|
684 }
|
|
|
685 // end of string
|
|
|
686 if (tc == '\0')
|
|
|
687 {
|
|
|
688 // error if at EOS as we are looking for a term
|
|
|
689 errorp1(ERR_BADEXPR);
|
|
|
690 return -1;
|
|
|
691 }
|
|
|
692
|
|
|
693 // we have a generic number here which may be decimal, hex, binary, or octal
|
|
|
694 // based on a suffix
|
|
|
695
|
|
|
696 // possible data types are binary (1), octal (2), decimal(4), hex (8)
|
|
|
697 valtype = 15;
|
|
|
698 hexval = octval = decval = binval = 0;
|
|
|
699 while (1)
|
|
|
700 {
|
|
|
701
|
|
|
702 // printf(" %c\n", **optr);
|
|
|
703 if (!**optr || !strchr("ABCDEFabcdefqhoQHO0123456789", **optr))
|
|
|
704 {
|
|
|
705 // end of string, must be decimal or the end of a bin
|
|
|
706 if (bindone == 1)
|
|
|
707 {
|
|
|
708 *tval = binval;
|
|
|
709 return 0;
|
|
|
710 }
|
|
|
711 if (valtype & 4)
|
|
|
712 {
|
|
|
713 *tval = decval;
|
|
|
714 return 0;
|
|
|
715 }
|
|
|
716 else
|
|
|
717 {
|
|
|
718 errorp1(ERR_BADEXPR);
|
|
|
719 return -1;
|
|
|
720 }
|
|
|
721 }
|
|
|
722 tc = toupper(*(*optr)++);
|
|
|
723
|
|
|
724 if (tc == 'H')
|
|
|
725 {
|
|
|
726 if (valtype & 8)
|
|
|
727 {
|
|
|
728 *tval = hexval;
|
|
|
729 return 0;
|
|
|
730 }
|
|
|
731 else
|
|
|
732 {
|
|
|
733 // syntax error
|
|
|
734 errorp1(ERR_BADEXPR);
|
|
|
735 return -1;
|
|
|
736 }
|
|
|
737 }
|
|
|
738
|
|
|
739 if (tc == 'Q' || tc == 'O')
|
|
|
740 {
|
|
|
741 if (valtype && 2)
|
|
|
742 {
|
|
|
743 *tval = octval;
|
|
|
744 return 0;
|
|
|
745 }
|
|
|
746 else
|
|
|
747 {
|
|
|
748 errorp1(ERR_BADEXPR);
|
|
|
749 return -1;
|
|
|
750 }
|
|
|
751 }
|
|
|
752
|
|
|
753 digval = tc - '0';
|
|
|
754 if (digval > 9)
|
|
|
755 digval -= 7;
|
|
|
756
|
|
|
757 // if it's not in the range of a hex digit, error out
|
|
|
758 if (tc < '0' || (tc > '9' && tc < 'A') || tc > 'F')
|
|
|
759 {
|
|
|
760 (*optr)--;
|
|
|
761 if (valtype & 4)
|
|
|
762 {
|
|
|
763 *tval = decval;
|
|
|
764 return 0;
|
|
|
765 }
|
|
|
766 // if we're in hex/bin mode and run to the end of the number
|
|
|
767 // we must have a binary constant or an error
|
|
|
768 // if the previous character is B, then we have binary
|
|
|
769 // else we have error since hex would require a terminating H
|
|
|
770 // which would be caught above
|
|
|
771 if (valtype == 8 && toupper(*(*optr)) == 'B')
|
|
|
772 {
|
|
|
773 *tval = binval;
|
|
|
774 return 0;
|
|
|
775 }
|
|
|
776 errorp1(ERR_BADEXPR);
|
|
|
777 return -1;
|
|
|
778 }
|
|
|
779
|
|
|
780 // if we have any characters past the end of the B, it's not binary
|
|
|
781 if (bindone == 1)
|
|
|
782 bindone = 0;
|
|
|
783 if (tc == 'B')
|
|
|
784 bindone = 1;
|
|
|
785 if (digval > 1)
|
|
|
786 valtype &= 14;
|
|
|
787 else if (digval > 7)
|
|
|
788 valtype &= 13;
|
|
|
789 else if (digval > 9)
|
|
|
790 valtype &= 11;
|
|
|
791
|
|
|
792 if (valtype & 8)
|
|
|
793 {
|
|
|
794 hexval = (hexval << 4) | digval;
|
|
|
795 }
|
|
|
796 if (valtype & 4)
|
|
|
797 {
|
|
|
798 decval = decval * 10 + digval;
|
|
|
799 }
|
|
|
800 if (valtype & 2)
|
|
|
801 {
|
|
|
802 octval = (octval << 3) | digval;
|
|
|
803 }
|
|
|
804 if (valtype & 1 && !bindone)
|
|
|
805 {
|
|
|
806 binval = (binval << 1) | digval;
|
|
|
807 }
|
|
|
808
|
|
|
809 }
|
|
|
810 // can't get here from there
|
|
|
811 }
|
|
|
812
|
|
|
813 // returns -1 if the expression cannot be parsed
|
|
|
814 // and returns -2 if there is an undefined symbol reference
|
|
|
815 // resulting value will be in *val; undefined symbols are parsed as
|
|
|
816 // value 0 but cl -> undef will be set.
|
|
|
817 int eval_expr(asmstate_t *as, sourceline_t *cl, char **optr, int *val)
|
|
|
818 {
|
|
|
819 int left;
|
|
|
820 int right;
|
|
|
821 char oper;
|
|
|
822 int rval;
|
|
|
823
|
|
|
824 // by default, return 0 in val
|
|
|
825 *val = 0;
|
|
|
826 cl -> undef = 0;
|
|
|
827
|
|
|
828 rval = eval_term(as, cl, optr, &left);
|
|
|
829 if (rval < 0)
|
|
|
830 return rval;
|
|
|
831
|
|
|
832 nextop:
|
|
|
833 oper = **optr;
|
|
|
834
|
|
|
835 // end of expr
|
|
|
836 if (isspace(oper) || oper == ',' || oper == '\0' || oper == ']' || oper == ')')
|
|
|
837 goto retleft;
|
|
|
838
|
|
|
839 // unrecognized chars
|
|
|
840 if (!strchr("+-*/%", oper))
|
|
|
841 goto retleft;
|
|
|
842
|
|
|
843 (*optr)++;
|
|
|
844
|
|
|
845 rval = eval_term(as, cl, optr, &right);
|
|
|
846 // propagate error
|
|
|
847 if (rval < 0)
|
|
|
848 return rval;
|
|
|
849
|
|
|
850 // do the operation and put it in "left"
|
|
|
851 switch (oper)
|
|
|
852 {
|
|
|
853 case '+':
|
|
|
854 left += right;
|
|
|
855 break;
|
|
|
856
|
|
|
857 case '-':
|
|
|
858 left -= right;
|
|
|
859 break;
|
|
|
860
|
|
|
861 case '*':
|
|
|
862 left *= right;
|
|
|
863 break;
|
|
|
864
|
|
|
865 case '/':
|
|
|
866 left /= right;
|
|
|
867 break;
|
|
|
868
|
|
|
869 case '%':
|
|
|
870 left %= right;
|
|
|
871 break;
|
|
|
872 }
|
|
|
873
|
|
|
874 goto nextop;
|
|
|
875
|
|
|
876 retleft:
|
|
|
877 *val = left;
|
|
|
878 return 0;
|
|
|
879 }
|
