annotate src/lwasm.c @ 84:e12edcfbebd5

Fixed problem with expression evaluation infrastructure not advancing input pointer on pass 2
author lost
date Wed, 14 Jan 2009 07:04:45 +0000
parents d0ce3f5f6797
children ea2cfebef5d0
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1 /*
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2 lwasm.c
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3 Copyright © 2009 William Astle
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4
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5 This file is part of LWASM.
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6
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7 LWASM is free software: you can redistribute it and/or modify it under the
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8 terms of the GNU General Public License as published by the Free Software
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9 Foundation, either version 3 of the License, or (at your option) any later
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10 version.
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11
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12 This program is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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15 more details.
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16
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17 You should have received a copy of the GNU General Public License along with
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18 this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20
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21 Contains random functions used by the assembler
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22 */
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23
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24 #define __lwasm_c_seen__
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25
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26 #include <stdarg.h>
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27 #include <stdlib.h>
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28 #include <stdio.h>
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29
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30 #include "lwasm.h"
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31 #include "util.h"
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32 #include "expr.h"
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33
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34 int debug_level = 0;
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35
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36 int register_error(asmstate_t *as, lwasm_line_t *l, int pass, const char *fmt, ...)
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37 {
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38 lwasm_error_t *e;
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39 va_list args;
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40 char errbuff[1024];
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41 int r;
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42
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43 if (as -> passnum != pass)
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44 return;
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45
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46 va_start(args, fmt);
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47
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48 e = lwasm_alloc(sizeof(lwasm_error_t));
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49
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50 e -> next = l -> err;
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51 l -> err = e;
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52
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53 as -> errorcount++;
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54
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55 r = vsnprintf(errbuff, 1024, fmt, args);
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56 e -> mess = lwasm_strdup(errbuff);
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57
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58 va_end(args);
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59
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60 return r;
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61 }
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62
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63 void lwasm_emit(asmstate_t *as, lwasm_line_t *l, int b)
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64 {
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65 as -> addr += 1;
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66 as -> addr &= 0xffff;
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67
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68 if (as -> outformat == OUTPUT_OBJ && !(as -> csect))
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69 {
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70 register_error(as, l, 1, "Output not allowed outside sections with obj target");
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71 return;
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72 }
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73 if (as -> outformat == OUTPUT_OBJ && as -> csect -> flags & SECTION_BSS)
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74 {
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75 register_error(as, l, 1, "Output not allowed inside BSS sections");
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76 return;
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77 }
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78 if (as -> passnum == 1)
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79 return;
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80
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81
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82 if (l -> codelen >= l -> codesize)
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83 {
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84 l -> bytes = realloc(l -> bytes, l -> codesize + 16);
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85 l -> codesize += 16;
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86 }
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87 l -> bytes[l -> codelen] = b & 0xff;
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88 l -> codelen += 1;
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89 }
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90
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91 void lwasm_emitop(asmstate_t *as, lwasm_line_t *l, int o)
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92 {
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93 if (o >= 0x100)
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94 lwasm_emit(as, l, o >> 8);
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95 lwasm_emit(as, l, o & 0xff);
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96 }
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97
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98 int lwasm_lookupreg2(const char *reglist, char **str)
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99 {
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100 int rval = 0;
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101
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102 while (*reglist)
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103 {
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104 if (toupper(**str) == *reglist)
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105 {
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106 // first char matches
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107 if (reglist[1] == ' ' && !isalpha(*(*str + 1)))
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108 break;
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109 if (toupper(*(*str + 1)) == reglist[1])
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110 break;
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111 }
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112 reglist += 2;
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113 rval++;
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114 }
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115 if (!*reglist)
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116 return -1;
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117 if (reglist[1] == ' ')
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118 (*str)++;
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119 else
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120 (*str) += 2;
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121 return rval;
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122 }
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123
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124 int lwasm_lookupreg3(const char *rlist, const char **str)
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125 {
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126 int rval = 0;
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127 int f = 0;
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128 const char *reglist = rlist;
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129
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130 while (*reglist)
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131 {
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132 if (toupper(**str) == *reglist)
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133 {
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134 // first char matches
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135 if (reglist[1] == ' ')
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136 {
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137 f = 1;
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138 break;
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139 }
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140 if (toupper(*(*str + 1)) == reglist[1])
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141 {
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142 // second char matches
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143 if (reglist[2] == ' ')
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144 {
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145 f = 1;
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146 break;
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147 }
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148 if (toupper(*(*str + 2)) == reglist[2])
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149 {
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150 f = 1;
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151 break;
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152 }
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153 }
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154 }
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155 reglist += 3;
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156 rval++;
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157 }
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158 if (f == 0)
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159 return -1;
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160
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161
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162 reglist = rval * 3 + rlist;
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163 if (reglist[1] == ' ')
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164 (*str) += 1;
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165 else if (reglist[2] == ' ')
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166 (*str) += 2;
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167 else
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168 (*str)+=3;
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169 return rval;
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170 }
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171
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172 struct symstateinfo
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173 {
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174 asmstate_t *as;
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175 lwasm_line_t *l;
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176 };
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177
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178 lwasm_expr_stack_t *lwasm_expr_lookup_symbol(char *sym, void *state)
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179 {
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180 lwasm_symbol_ent_t *se;
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181 struct symstateinfo *st;
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182 lwasm_expr_stack_t *rs;
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183 lwasm_expr_term_t *t;
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184 lwasm_expr_stack_node_t *n;
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185
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186 int val;
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187
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188 st = state;
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189 debug_message(3, "lwasm_expr_lookup_symbol(): find '%s' (context=%d)", sym, st -> as -> context);
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190
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191 // check for special symbols first...
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192 if (sym[1] == '\0')
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193 {
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194 switch (sym[0])
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195 {
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196 // current line address
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197 case '*':
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198 case '.':
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199 val = st -> l -> codeaddr;
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200 goto retconst;
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201
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202 case '<':
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203 // previous branch point
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parents: 58
diff changeset
204 // not implemented
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
205 break;
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
206 case '>':
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
207 // next branch point
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
208 // not implemented
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
209 break;
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
210 }
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
211 }
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
212
37
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
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parents: 32
diff changeset
213 // look for local symbol first then global symbol
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
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parents: 32
diff changeset
214 se = lwasm_find_symbol(st -> as, sym, st -> as -> context);
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
215 if (!se)
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
216 se = lwasm_find_symbol(st -> as, sym, -1);
52
b9856da2674a Added file inclusion
lost
parents: 42
diff changeset
217 debug_message(3, "lwasm_expr_lookup_symbol(): got '%p'", se);
37
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
218 if (!se)
77
a338d496350e Checkpointing conversion to allow object target
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parents: 76
diff changeset
219 {
a338d496350e Checkpointing conversion to allow object target
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parents: 76
diff changeset
220 register_error(st -> as, st -> l, 2, "Undefined symbol '%s'", sym);
76
2fe5fd7d65a3 Checkpointing object target implementation
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parents: 74
diff changeset
221 return NULL;
77
a338d496350e Checkpointing conversion to allow object target
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parents: 76
diff changeset
222 }
76
2fe5fd7d65a3 Checkpointing object target implementation
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parents: 74
diff changeset
223 if (st -> as -> outformat != OUTPUT_OBJ || se -> sect == NULL || se -> sect == st -> as -> csect)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
224 {
2fe5fd7d65a3 Checkpointing object target implementation
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parents: 74
diff changeset
225 // global symbol, intrasegment reference, or not an object target
2fe5fd7d65a3 Checkpointing object target implementation
lost
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diff changeset
226 val = se -> value;
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
227 goto retconst;
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
228 }
2fe5fd7d65a3 Checkpointing object target implementation
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diff changeset
229 // an intersegment reference will return as NULL (to be resolved at output/link time)
2fe5fd7d65a3 Checkpointing object target implementation
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diff changeset
230 // if se -> expr is NULL, it has to be an intersegment reference here
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
231 if (se -> expr == NULL)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
232 {
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
233 return NULL;
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
234 }
2fe5fd7d65a3 Checkpointing object target implementation
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parents: 74
diff changeset
235
2fe5fd7d65a3 Checkpointing object target implementation
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parents: 74
diff changeset
236 // duplicate the expression for return
2fe5fd7d65a3 Checkpointing object target implementation
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diff changeset
237 rs = lwasm_expr_stack_create();
2fe5fd7d65a3 Checkpointing object target implementation
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parents: 74
diff changeset
238 for (n = se -> expr -> head; n; n = n -> next)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
239 {
2fe5fd7d65a3 Checkpointing object target implementation
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parents: 74
diff changeset
240 lwasm_expr_stack_push(rs, n -> term);
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
241 }
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
242 return rs;
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
243
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
244 retconst:
2fe5fd7d65a3 Checkpointing object target implementation
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parents: 74
diff changeset
245 rs = lwasm_expr_stack_create();
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
246 t = lwasm_expr_term_create_int(val);
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
247 lwasm_expr_stack_push(rs, t);
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
248 lwasm_expr_term_free(t);
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
249 return rs;
37
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
250 }
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
251
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
252 lwasm_expr_stack_t *lwasm_evaluate_expr(asmstate_t *as, lwasm_line_t *l, const char *inp, const char **outp)
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
253 {
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
254 struct symstateinfo st;
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
255
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
256 st.as = as;
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
257 st.l = l;
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
258
38
9bd584bb6296 Added debugging message infrastructure
lost
parents: 37
diff changeset
259 debug_message(2, "Evaluate expression: %s", inp);
9bd584bb6296 Added debugging message infrastructure
lost
parents: 37
diff changeset
260
37
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
261 return(lwasm_expr_eval(inp, outp, lwasm_expr_lookup_symbol, &st));
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
262 }
38
9bd584bb6296 Added debugging message infrastructure
lost
parents: 37
diff changeset
263
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
264
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
265 int lwasm_reevaluate_expr(asmstate_t *as, lwasm_line_t *l, lwasm_expr_stack_t *s)
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
266 {
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
267 struct symstateinfo st;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
268
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
269 st.as = as;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
270 st.l = l;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
271
a338d496350e Checkpointing conversion to allow object target
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parents: 76
diff changeset
272 return(lwasm_expr_reval(s, lwasm_expr_lookup_symbol, &st));
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
273 }
a338d496350e Checkpointing conversion to allow object target
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parents: 76
diff changeset
274
76
2fe5fd7d65a3 Checkpointing object target implementation
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parents: 74
diff changeset
275 // return 1 if no undefined symbols (externals and incompletes are okay)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
276 // return 0 if there are undefined symbols
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
277 int lwasm_expr_result_ckconst(asmstate_t *as, lwasm_expr_stack_t *s)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
278 {
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
279 lwasm_expr_stack_node_t *n;
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
280 lwasm_symbol_ent_t *se;
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
281
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
282 if (as -> outformat != OUTPUT_OBJ)
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
283 {
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
284 if (lwasm_expr_is_constant(s))
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
285 return 1;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
286 else
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
287 return 0;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
288 }
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
289
76
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
290 for (n = s -> head; n; n = n -> next)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
291 {
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
292 if (n -> term -> term_type == LWASM_TERM_SYM)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
293 {
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
294 se = lwasm_find_symbol(as, n -> term -> symbol, as -> context);
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
295 if (!se)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
296 se = lwasm_find_symbol(as, n -> term -> symbol, -1);
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
297 if (!se)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
298 return 0;
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
299 }
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
300 }
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
301 return 1;
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
302 }
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
303
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
304 /*
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
305 Evaluate an expression according to the flag value. Return 0 if a constant result was
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
306 obtained, 1 if an incomplete result was obtained, and -1 if an error was flagged.
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
307
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
308 Symbol resolution will be modified for the object target as follows:
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
309 - a symbol which is not defined within a section will evaluate as a constant
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
310 - a symbol which is defined within the same section will evaluate as a constant
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
311 - a symbol defined in another section will remain unresolved
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
312 - external references will also remain unresolved
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
313
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
314 EXPR_PASS2PASS will cause the result from pass 1 along with the offset to
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
315 the end of the expression to be stored in the line data. There can only be
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
316 one such expression per source line. In this case, the expression is parsed
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
317 and evaluated on pass 1 but the intermediate representation is re-evaluated
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
318 on pass 2.
76
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
319 */
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
320 /*
55
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
321 int lwasm_expr_result(asmstate_t *as, lwasm_line_t *l, char **inp, int flag, int *val)
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
322 {
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
323 lwasm_expr_stack_t *s;
58
b1d81800bc91 Added symbol listing to list file; various fixes
lost
parents: 57
diff changeset
324 const char *ep;
55
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
325 int rval;
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
326
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
327 s = lwasm_evaluate_expr(as, l, *inp, &ep);
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
328 if (!s)
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
329 {
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
330 register_error(as, l, 1, "Bad expression");
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
331 *val = 0;
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
332 return -1;
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
333 }
58
b1d81800bc91 Added symbol listing to list file; various fixes
lost
parents: 57
diff changeset
334 *inp = (char *)ep;
55
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
335
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
336 if (flag & EXPR_PASS1CONST && as -> passnum == 1 && !lwasm_expr_result_ckconst(as, s))
55
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
337 {
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
338 register_error(as, l, 1, "Undefined reference (pass 1)");
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
339 *val = 0;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
340 lwasm_expr_stack_free(s);
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
341 return -1;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
342 }
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
343 if (flag & EXPR_PASS2CONST && as -> passnum == 2 && !lwasm_expr_result_ckconst(as, s))
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
344 {
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
345 register_error(as, l, 2, "Undefined reference (pass 2)");
55
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
346 *val = 0;
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
347 lwasm_expr_stack_free(s);
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
348 return -1;
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
349 }
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
350 if (flag & EXPR_NOINTERSECT && !lwasm_expr_is_constant(s))
55
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
351 {
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
352 register_error(as, l, 2, "Invalid inter-section reference");
55
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
353 }
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
354 *val = lwasm_expr_get_value(s);
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
355 if (l -> expr)
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
356 {
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
357 lwasm_expr_stack_free(l -> expr);
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
358 l -> expr = NULL;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
359 }
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
360 if (lwasm_is_constant(s))
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
361 {
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
362 // fully resolved value here
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
363 lwasm_expr_stack_free(s);
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
364 }
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
365 else
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
366 {
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
367 // incomplete reference here
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
368 l -> expr = s;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
369 }
55
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
370
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
371 if (flag & EXPR_BYTE && as -> passnum == 2 && (*val < -128 || *val > 255))
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
372 {
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
373 register_error(as, l, 2, "Byte overflow");
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
374 *val &= 0xff;
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
375 return -1;
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
376 }
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
377 if (flag & EXPR_BYTE)
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
378 {
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
379 *val &= 0xff;
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
380 }
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
381
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
382 return 0;
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
383 }
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
384 */
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
385 int lwasm_expr_result2(asmstate_t *as, lwasm_line_t *l, char **inp, int flag, int *val, int slot)
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
386 {
79
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
387 lwasm_expr_stack_t *s = NULL;
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
388 const char *ep;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
389 int rval;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
390
79
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
391 if (as -> passnum == 1 || slot < 0)
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
392 {
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
393 s = lwasm_evaluate_expr(as, l, *inp, &ep);
79
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
394 if (slot >= 0)
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
395 l -> exprs[slot] = s;
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
396 if (!s)
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
397 {
a338d496350e Checkpointing conversion to allow object target
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parents: 76
diff changeset
398 register_error(as, l, 1, "Bad expression");
a338d496350e Checkpointing conversion to allow object target
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parents: 76
diff changeset
399 *val = 0;
a338d496350e Checkpointing conversion to allow object target
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parents: 76
diff changeset
400 return -1;
a338d496350e Checkpointing conversion to allow object target
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parents: 76
diff changeset
401 }
a338d496350e Checkpointing conversion to allow object target
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parents: 76
diff changeset
402 *inp = (char *)ep;
79
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
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parents: 78
diff changeset
403 if (slot >= 0)
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
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parents: 78
diff changeset
404 {
84
e12edcfbebd5 Fixed problem with expression evaluation infrastructure not advancing input pointer on pass 2
lost
parents: 79
diff changeset
405 l -> exprends[slot] = ep;
79
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
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parents: 78
diff changeset
406 l -> exprvals[slot] = lwasm_expr_get_value(s);
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
407 }
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
408 }
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
409 else if (l -> exprs[slot])
a338d496350e Checkpointing conversion to allow object target
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parents: 76
diff changeset
410 {
a338d496350e Checkpointing conversion to allow object target
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parents: 76
diff changeset
411 s = l -> exprs[slot];
a338d496350e Checkpointing conversion to allow object target
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parents: 76
diff changeset
412 lwasm_reevaluate_expr(as, l, s);
a338d496350e Checkpointing conversion to allow object target
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parents: 76
diff changeset
413 l -> exprvals[slot] = lwasm_expr_get_value(s);
a338d496350e Checkpointing conversion to allow object target
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parents: 76
diff changeset
414 }
84
e12edcfbebd5 Fixed problem with expression evaluation infrastructure not advancing input pointer on pass 2
lost
parents: 79
diff changeset
415 if (as -> passnum == 2 && slot >= 0)
e12edcfbebd5 Fixed problem with expression evaluation infrastructure not advancing input pointer on pass 2
lost
parents: 79
diff changeset
416 *inp = l -> exprends[slot];
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
417
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
418 if (s && lwasm_expr_is_constant(s))
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
419 {
a338d496350e Checkpointing conversion to allow object target
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parents: 76
diff changeset
420 lwasm_expr_stack_free(s);
a338d496350e Checkpointing conversion to allow object target
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parents: 76
diff changeset
421 l -> exprs[slot] = NULL;
a338d496350e Checkpointing conversion to allow object target
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parents: 76
diff changeset
422 s = NULL;
a338d496350e Checkpointing conversion to allow object target
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parents: 76
diff changeset
423 }
a338d496350e Checkpointing conversion to allow object target
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parents: 76
diff changeset
424
79
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
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parents: 78
diff changeset
425 if (!s && slot >= 0)
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
426 {
a338d496350e Checkpointing conversion to allow object target
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parents: 76
diff changeset
427 *val = l -> exprvals[slot];
a338d496350e Checkpointing conversion to allow object target
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parents: 76
diff changeset
428 return 0;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
429 }
79
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
430 else if (!s)
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
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parents: 78
diff changeset
431 {
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
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parents: 78
diff changeset
432 *val = 0;
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
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parents: 78
diff changeset
433 return 0;
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
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parents: 78
diff changeset
434 }
78
121bf4a588ea Checkpointing deployment of non-constant expression handling
lost
parents: 77
diff changeset
435
121bf4a588ea Checkpointing deployment of non-constant expression handling
lost
parents: 77
diff changeset
436 // was a constant result on pass 1 requested?
121bf4a588ea Checkpointing deployment of non-constant expression handling
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parents: 77
diff changeset
437 // that means we must have a constant on either pass
121bf4a588ea Checkpointing deployment of non-constant expression handling
lost
parents: 77
diff changeset
438 if (flag & EXPR_PASS1CONST)
121bf4a588ea Checkpointing deployment of non-constant expression handling
lost
parents: 77
diff changeset
439 {
121bf4a588ea Checkpointing deployment of non-constant expression handling
lost
parents: 77
diff changeset
440 *val = 0;
79
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
441 if (slot >= 0)
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
442 l -> exprvals[slot] = 0;
78
121bf4a588ea Checkpointing deployment of non-constant expression handling
lost
parents: 77
diff changeset
443 register_error(as, l, 1, "Illegal forward, external, or inter-section reference");
121bf4a588ea Checkpointing deployment of non-constant expression handling
lost
parents: 77
diff changeset
444 lwasm_expr_stack_free(s);
79
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
445 if (slot >= 0)
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
446 l -> exprs[slot] = NULL;
78
121bf4a588ea Checkpointing deployment of non-constant expression handling
lost
parents: 77
diff changeset
447 return -1;
121bf4a588ea Checkpointing deployment of non-constant expression handling
lost
parents: 77
diff changeset
448 }
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
449
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
450 return 1;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
451 }
55
8e32696380f3 added expression evaluation and checking function
lost
parents: 52
diff changeset
452
38
9bd584bb6296 Added debugging message infrastructure
lost
parents: 37
diff changeset
453 void debug_message(int level, const char *fmt, ...)
9bd584bb6296 Added debugging message infrastructure
lost
parents: 37
diff changeset
454 {
9bd584bb6296 Added debugging message infrastructure
lost
parents: 37
diff changeset
455 va_list args;
9bd584bb6296 Added debugging message infrastructure
lost
parents: 37
diff changeset
456
9bd584bb6296 Added debugging message infrastructure
lost
parents: 37
diff changeset
457 va_start(args, fmt);
9bd584bb6296 Added debugging message infrastructure
lost
parents: 37
diff changeset
458 if (debug_level >= level)
9bd584bb6296 Added debugging message infrastructure
lost
parents: 37
diff changeset
459 {
39
efa19ec69df9 tweaked debugging system for expression handler
lost
parents: 38
diff changeset
460 if (level > 0)
efa19ec69df9 tweaked debugging system for expression handler
lost
parents: 38
diff changeset
461 fprintf(stderr, "DEBUG %d: ", level);
38
9bd584bb6296 Added debugging message infrastructure
lost
parents: 37
diff changeset
462 vfprintf(stderr, fmt, args);
9bd584bb6296 Added debugging message infrastructure
lost
parents: 37
diff changeset
463 fputc('\n', stderr);
9bd584bb6296 Added debugging message infrastructure
lost
parents: 37
diff changeset
464 }
9bd584bb6296 Added debugging message infrastructure
lost
parents: 37
diff changeset
465 va_end(args);
9bd584bb6296 Added debugging message infrastructure
lost
parents: 37
diff changeset
466 }
57
035b95a3690f Added conditional assembly and macros
lost
parents: 55
diff changeset
467
035b95a3690f Added conditional assembly and macros
lost
parents: 55
diff changeset
468 int lwasm_next_context(asmstate_t *as)
035b95a3690f Added conditional assembly and macros
lost
parents: 55
diff changeset
469 {
58
b1d81800bc91 Added symbol listing to list file; various fixes
lost
parents: 57
diff changeset
470 int r;
b1d81800bc91 Added symbol listing to list file; various fixes
lost
parents: 57
diff changeset
471 r = as -> nextcontext;
b1d81800bc91 Added symbol listing to list file; various fixes
lost
parents: 57
diff changeset
472 as -> nextcontext += 1;
b1d81800bc91 Added symbol listing to list file; various fixes
lost
parents: 57
diff changeset
473 debug_message(3, "lwasm_next_context(): %d (%d) pass %d", r, as -> nextcontext, as -> passnum);
b1d81800bc91 Added symbol listing to list file; various fixes
lost
parents: 57
diff changeset
474 return r;
57
035b95a3690f Added conditional assembly and macros
lost
parents: 55
diff changeset
475 }
035b95a3690f Added conditional assembly and macros
lost
parents: 55
diff changeset
476