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annotate src/lwasm.c @ 116:817ab0e124fa

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reading files implemented
author lost
date Wed, 21 Jan 2009 03:15:49 +0000
parents f59c0916753d
children 0ee5f65bccf9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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57495da01900 Initial checking of LWASM
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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;
101
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176 int flags;
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177 };
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178
76
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179 lwasm_expr_stack_t *lwasm_expr_lookup_symbol(char *sym, void *state)
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180 {
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181 lwasm_symbol_ent_t *se;
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182 struct symstateinfo *st;
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183 lwasm_expr_stack_t *rs;
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184 lwasm_expr_term_t *t;
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185 lwasm_expr_stack_node_t *n;
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186
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187 int val;
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188
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189 st = state;
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190 debug_message(3, "lwasm_expr_lookup_symbol(): find '%s' (context=%d)", sym, st -> as -> context);
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191
60
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192 // check for special symbols first...
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193 if (sym[1] == '\0')
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194 {
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195 switch (sym[0])
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196 {
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197 // current line address
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198 case '*':
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199 case '.':
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200 val = st -> l -> codeaddr;
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201 goto retconst;
60
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diff changeset
202
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
203 case '<':
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
204 // previous branch point
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
205 // not implemented
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
206 break;
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
207 case '>':
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
208 // next branch point
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
209 // not implemented
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
210 break;
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
211 }
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
212 }
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
213
37
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
214 // look for local symbol first then global symbol
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
215 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
216 if (!se)
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
217 se = lwasm_find_symbol(st -> as, sym, -1);
52
b9856da2674a Added file inclusion
lost
parents: 42
diff changeset
218 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
219 if (!se)
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
220 {
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
221 register_error(st -> as, st -> l, 2, "Undefined symbol '%s'", sym);
76
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
222 return NULL;
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
223 }
92
ea2cfebef5d0 Make external symbols remain unresolved in expressions and also flag them in the symbol list
lost
parents: 84
diff changeset
224 // external reference - can not resolve it
ea2cfebef5d0 Make external symbols remain unresolved in expressions and also flag them in the symbol list
lost
parents: 84
diff changeset
225 if (se -> flags & SYMBOL_EXTERN)
ea2cfebef5d0 Make external symbols remain unresolved in expressions and also flag them in the symbol list
lost
parents: 84
diff changeset
226 {
ea2cfebef5d0 Make external symbols remain unresolved in expressions and also flag them in the symbol list
lost
parents: 84
diff changeset
227 return NULL;
ea2cfebef5d0 Make external symbols remain unresolved in expressions and also flag them in the symbol list
lost
parents: 84
diff changeset
228 }
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
229 if (st -> flags & EXPR_SECTCONST)
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
230 {
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
231 if (se -> sect == st -> l -> sect)
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
232 {
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
233 if (se -> expr)
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
234 goto retsym;
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
235 val = se -> value;
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
236 goto retconst;
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
237 }
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
238 }
93
34ca1c6e9550 Fixed symbol resolution to not resolve intra-section references to constants by default
lost
parents: 92
diff changeset
239 if (st -> as -> outformat == OUTPUT_OBJ && se -> sect != NULL)
34ca1c6e9550 Fixed symbol resolution to not resolve intra-section references to constants by default
lost
parents: 92
diff changeset
240 {
34ca1c6e9550 Fixed symbol resolution to not resolve intra-section references to constants by default
lost
parents: 92
diff changeset
241 return NULL;
34ca1c6e9550 Fixed symbol resolution to not resolve intra-section references to constants by default
lost
parents: 92
diff changeset
242 }
34ca1c6e9550 Fixed symbol resolution to not resolve intra-section references to constants by default
lost
parents: 92
diff changeset
243 if (st -> as -> outformat != OUTPUT_OBJ || se -> sect == NULL)
76
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
244 {
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
245 // global symbol, intrasegment reference, or not an object target
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
246 val = se -> value;
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
247 goto retconst;
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
248 }
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
249
76
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
250 // an intersegment reference will return as NULL (to be resolved at output/link time)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
251 // if se -> expr is NULL, it has to be an intersegment reference here
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
252 if (se -> expr == NULL)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
253 {
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
254 return NULL;
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
255 }
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
256
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
257 retsym:
76
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
258 // duplicate the expression for return
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
259 rs = lwasm_expr_stack_create();
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
260 for (n = se -> expr -> head; n; n = n -> next)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
261 {
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
262 lwasm_expr_stack_push(rs, n -> term);
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
263 }
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
264 return rs;
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
265
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
266 retconst:
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
267 rs = lwasm_expr_stack_create();
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
268 t = lwasm_expr_term_create_int(val);
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
269 lwasm_expr_stack_push(rs, t);
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
270 lwasm_expr_term_free(t);
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
271 return rs;
37
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
272 }
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
273
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
274 lwasm_expr_stack_t *lwasm_evaluate_expr(asmstate_t *as, lwasm_line_t *l, const char *inp, const char **outp, int flags)
37
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
275 {
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
276 struct symstateinfo st;
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
277
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
278 st.as = as;
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
279 st.l = l;
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
280 st.flags = flags;
37
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
281
38
9bd584bb6296 Added debugging message infrastructure
lost
parents: 37
diff changeset
282 debug_message(2, "Evaluate expression: %s", inp);
9bd584bb6296 Added debugging message infrastructure
lost
parents: 37
diff changeset
283
37
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
284 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
285 }
38
9bd584bb6296 Added debugging message infrastructure
lost
parents: 37
diff changeset
286
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
287
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
288 int lwasm_reevaluate_expr(asmstate_t *as, lwasm_line_t *l, lwasm_expr_stack_t *s, int flags)
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
289 {
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
290 struct symstateinfo st;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
291
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
292 st.as = as;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
293 st.l = l;
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
294 st.flags = flags;
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
295 return(lwasm_expr_reval(s, lwasm_expr_lookup_symbol, &st));
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
296 }
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
297
76
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
298 // return 1 if no undefined symbols (externals and incompletes are okay)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
299 // return 0 if there are undefined symbols
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
300 int lwasm_expr_result_ckconst(asmstate_t *as, lwasm_expr_stack_t *s)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
301 {
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
302 lwasm_expr_stack_node_t *n;
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
303 lwasm_symbol_ent_t *se;
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
304
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
305 if (as -> outformat != OUTPUT_OBJ)
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
306 {
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
307 if (lwasm_expr_is_constant(s))
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
308 return 1;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
309 else
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
310 return 0;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
311 }
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
312
76
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
313 for (n = s -> head; n; n = n -> next)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
314 {
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
315 if (n -> term -> term_type == LWASM_TERM_SYM)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
316 {
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
317 se = lwasm_find_symbol(as, n -> term -> symbol, as -> context);
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
318 if (!se)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
319 se = lwasm_find_symbol(as, n -> term -> symbol, -1);
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
320 if (!se)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
321 return 0;
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
322 }
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
323 }
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
324 return 1;
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
325 }
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
326
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
327 /*
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
328 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
329 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
330
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
331 */
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
332 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
333 {
79
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
334 lwasm_expr_stack_t *s = NULL;
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
335 const char *ep;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
336 int rval;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
337
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
338 if ((as -> passnum == 1 && !(flag & EXPR_REEVAL)) || slot < 0)
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
339 {
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
340 s = lwasm_evaluate_expr(as, l, *inp, &ep, flag);
79
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
341 if (slot >= 0)
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
342 l -> exprs[slot] = s;
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
343 if (!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, 1, "Bad expression");
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
346 *val = 0;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
347 return -1;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
348 }
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
349 *inp = (char *)ep;
79
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
350 if (slot >= 0)
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
351 {
94
83ba34ed11b3 Fixed problem with constant expressions evaluating to 0 when they shouldn't
lost
parents: 93
diff changeset
352 l -> exprends[slot] = (char *)ep;
79
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
353 l -> exprvals[slot] = lwasm_expr_get_value(s);
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
354 }
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
355 }
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
356 else if (l -> exprs[slot])
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
357 {
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
358 s = l -> exprs[slot];
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
359 lwasm_reevaluate_expr(as, l, s, flag);
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
360 l -> exprvals[slot] = lwasm_expr_get_value(s);
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
361 }
84
e12edcfbebd5 Fixed problem with expression evaluation infrastructure not advancing input pointer on pass 2
lost
parents: 79
diff changeset
362 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
363 *inp = l -> exprends[slot];
77
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 if (s && lwasm_expr_is_constant(s))
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
366 {
94
83ba34ed11b3 Fixed problem with constant expressions evaluating to 0 when they shouldn't
lost
parents: 93
diff changeset
367 *val = lwasm_expr_get_value(s);
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
368 lwasm_expr_stack_free(s);
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
369 l -> exprs[slot] = NULL;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
370 s = NULL;
94
83ba34ed11b3 Fixed problem with constant expressions evaluating to 0 when they shouldn't
lost
parents: 93
diff changeset
371 return 0;
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
372 }
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
373
79
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
374 if (!s && slot >= 0)
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
375 {
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
376 *val = l -> exprvals[slot];
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
377 return 0;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
378 }
79
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
379 else if (!s)
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
380 {
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
381 *val = 0;
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
382 return 0;
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
383 }
78
121bf4a588ea Checkpointing deployment of non-constant expression handling
lost
parents: 77
diff changeset
384
121bf4a588ea Checkpointing deployment of non-constant expression handling
lost
parents: 77
diff changeset
385 // was a constant result on pass 1 requested?
121bf4a588ea Checkpointing deployment of non-constant expression handling
lost
parents: 77
diff changeset
386 // that means we must have a constant on either pass
121bf4a588ea Checkpointing deployment of non-constant expression handling
lost
parents: 77
diff changeset
387 if (flag & EXPR_PASS1CONST)
121bf4a588ea Checkpointing deployment of non-constant expression handling
lost
parents: 77
diff changeset
388 {
121bf4a588ea Checkpointing deployment of non-constant expression handling
lost
parents: 77
diff changeset
389 *val = 0;
79
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
390 if (slot >= 0)
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
391 l -> exprvals[slot] = 0;
78
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392 register_error(as, l, 1, "Illegal forward, external, or inter-section reference");
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393 lwasm_expr_stack_free(s);
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394 if (slot >= 0)
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395 l -> exprs[slot] = NULL;
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396 return -1;
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397 }
77
a338d496350e Checkpointing conversion to allow object target
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398
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399 return 1;
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400 }
55
8e32696380f3 added expression evaluation and checking function
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401
38
9bd584bb6296 Added debugging message infrastructure
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402 void debug_message(int level, const char *fmt, ...)
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403 {
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404 va_list args;
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405
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406 va_start(args, fmt);
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407 if (debug_level >= level)
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408 {
39
efa19ec69df9 tweaked debugging system for expression handler
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409 if (level > 0)
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410 fprintf(stderr, "DEBUG %d: ", level);
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411 vfprintf(stderr, fmt, args);
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412 fputc('\n', stderr);
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413 }
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414 va_end(args);
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415 }
57
035b95a3690f Added conditional assembly and macros
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416
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417 int lwasm_next_context(asmstate_t *as)
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418 {
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b1d81800bc91 Added symbol listing to list file; various fixes
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419 int r;
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420 r = as -> nextcontext;
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421 as -> nextcontext += 1;
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422 debug_message(3, "lwasm_next_context(): %d (%d) pass %d", r, as -> nextcontext, as -> passnum);
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423 return r;
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424 }
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425