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annotate lwasm/lwasm.c @ 227:4c60c3a09597

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Various updates to the manual
author lost
date Fri, 12 Jun 2009 00:06:24 +0000
parents bae1e3ecdce1
children a58f49a77441
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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 #include <config.h>
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26
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27 #include <stdarg.h>
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28 #include <stdlib.h>
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29 #include <stdio.h>
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30
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31 #include "lwasm.h"
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32 #include "util.h"
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33 #include "expr.h"
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34
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35 int debug_level = 0;
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36
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37 int register_error(asmstate_t *as, lwasm_line_t *l, int pass, const char *fmt, ...)
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38 {
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39 lwasm_error_t *e;
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40 va_list args;
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41 char errbuff[1024];
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42 int r;
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43
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44 if (!l)
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45 return;
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46
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47 if (as -> passnum != pass)
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48 return;
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49
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50 va_start(args, fmt);
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51
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52 e = lwasm_alloc(sizeof(lwasm_error_t));
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53
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54 e -> next = l -> err;
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55 l -> err = e;
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56
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57 as -> errorcount++;
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58
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59 r = vsnprintf(errbuff, 1024, fmt, args);
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60 e -> mess = lwasm_strdup(errbuff);
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61
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62 va_end(args);
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63
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64 return r;
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65 }
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66
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67 void lwasm_emit(asmstate_t *as, lwasm_line_t *l, int b)
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68 {
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69 as -> addr += 1;
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70 as -> addr &= 0xffff;
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71
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72 if (as -> outformat == OUTPUT_OBJ && !(as -> csect))
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73 {
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74 register_error(as, l, 1, "Output not allowed outside sections with obj target");
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75 return;
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76 }
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77 if (as -> outformat == OUTPUT_OBJ && as -> csect -> flags & SECTION_BSS)
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78 {
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79 register_error(as, l, 1, "Output not allowed inside BSS sections");
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80 return;
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81 }
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82 if (as -> passnum == 1)
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83 return;
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84
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85
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86 if (l -> codelen >= l -> codesize)
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87 {
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88 l -> bytes = realloc(l -> bytes, l -> codesize + 16);
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89 l -> codesize += 16;
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90 }
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91 l -> bytes[l -> codelen] = b & 0xff;
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92 l -> codelen += 1;
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93 }
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94
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95 void lwasm_emitop(asmstate_t *as, lwasm_line_t *l, int o)
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96 {
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97 if (o >= 0x100)
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98 lwasm_emit(as, l, o >> 8);
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99 lwasm_emit(as, l, o & 0xff);
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100 }
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101
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102 int lwasm_lookupreg2(const char *reglist, char **str)
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103 {
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104 int rval = 0;
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105
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106 while (*reglist)
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107 {
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108 if (toupper(**str) == *reglist)
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109 {
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110 // first char matches
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111 if (reglist[1] == ' ' && !isalpha(*(*str + 1)))
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112 break;
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113 if (toupper(*(*str + 1)) == reglist[1])
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114 break;
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115 }
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116 reglist += 2;
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117 rval++;
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118 }
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119 if (!*reglist)
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120 return -1;
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121 if (reglist[1] == ' ')
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122 (*str)++;
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123 else
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124 (*str) += 2;
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125 return rval;
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126 }
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127
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128 int lwasm_lookupreg3(const char *rlist, const char **str)
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129 {
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130 int rval = 0;
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131 int f = 0;
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132 const char *reglist = rlist;
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133
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134 while (*reglist)
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135 {
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136 if (toupper(**str) == *reglist)
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137 {
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138 // first char matches
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139 if (reglist[1] == ' ')
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140 {
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141 f = 1;
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142 break;
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143 }
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144 if (toupper(*(*str + 1)) == reglist[1])
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145 {
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146 // second char matches
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147 if (reglist[2] == ' ')
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148 {
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149 f = 1;
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150 break;
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151 }
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152 if (toupper(*(*str + 2)) == reglist[2])
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153 {
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154 f = 1;
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155 break;
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156 }
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157 }
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158 }
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159 reglist += 3;
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160 rval++;
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161 }
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162 if (f == 0)
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163 return -1;
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164
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165
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166 reglist = rval * 3 + rlist;
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167 if (reglist[1] == ' ')
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168 (*str) += 1;
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169 else if (reglist[2] == ' ')
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170 (*str) += 2;
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171 else
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172 (*str)+=3;
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173 return rval;
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174 }
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175
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176 struct symstateinfo
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177 {
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178 asmstate_t *as;
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179 lwasm_line_t *l;
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180 int flags;
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181 };
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182
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183 lwasm_expr_stack_t *lwasm_expr_lookup_symbol(char *sym, void *state)
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184 {
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185 lwasm_symbol_ent_t *se;
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186 struct symstateinfo *st;
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187 lwasm_expr_stack_t *rs;
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188 lwasm_expr_term_t *t;
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189 lwasm_expr_stack_node_t *n;
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190
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191 int val;
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192
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193 st = state;
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194 debug_message(3, "lwasm_expr_lookup_symbol(): find '%s' (context=%d)", sym, st -> as -> context);
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195
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196 // check for special symbols first...
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197 if (sym[1] == '\0')
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198 {
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199 switch (sym[0])
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200 {
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201 // current line address
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
202 case '*':
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
203 case '.':
76
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
204 val = st -> l -> codeaddr;
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
205 goto retconst;
60
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
206
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 // previous 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 case '>':
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
212 // next branch point
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
213 // not implemented
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
214 break;
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
215 }
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
216 }
309810f39ab7 Implemented the * and . special symbols
lost
parents: 58
diff changeset
217
37
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
218 // 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
219 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
220 if (!se)
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
221 se = lwasm_find_symbol(st -> as, sym, -1);
52
b9856da2674a Added file inclusion
lost
parents: 42
diff changeset
222 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
223 if (!se)
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
224 {
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
225 register_error(st -> as, st -> l, 2, "Undefined symbol '%s'", sym);
76
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
226 return NULL;
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
227 }
92
ea2cfebef5d0 Make external symbols remain unresolved in expressions and also flag them in the symbol list
lost
parents: 84
diff changeset
228 // 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
229 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
230 {
ea2cfebef5d0 Make external symbols remain unresolved in expressions and also flag them in the symbol list
lost
parents: 84
diff changeset
231 return NULL;
ea2cfebef5d0 Make external symbols remain unresolved in expressions and also flag them in the symbol list
lost
parents: 84
diff changeset
232 }
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
233 if (st -> flags & EXPR_SECTCONST)
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
234 {
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
235 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
236 {
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
237 if (se -> expr)
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
238 goto retsym;
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
239 val = se -> value;
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
240 goto retconst;
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
241 }
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
242 }
93
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)
34ca1c6e9550 Fixed symbol resolution to not resolve intra-section references to constants by default
lost
parents: 92
diff changeset
244 {
34ca1c6e9550 Fixed symbol resolution to not resolve intra-section references to constants by default
lost
parents: 92
diff changeset
245 return NULL;
34ca1c6e9550 Fixed symbol resolution to not resolve intra-section references to constants by default
lost
parents: 92
diff changeset
246 }
34ca1c6e9550 Fixed symbol resolution to not resolve intra-section references to constants by default
lost
parents: 92
diff changeset
247 if (st -> as -> outformat != OUTPUT_OBJ || se -> sect == NULL)
76
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
248 {
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
249 // global symbol, intrasegment reference, or not an object target
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
250 val = se -> value;
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
251 goto retconst;
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
252 }
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
253
76
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
254 // an intersegment reference will return as NULL (to be resolved at output/link time)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
255 // if se -> expr is NULL, it has to be an intersegment reference here
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
256 if (se -> expr == NULL)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
257 {
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
258 return NULL;
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
259 }
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
260
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
261 retsym:
76
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
262 // duplicate the expression for return
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
263 rs = lwasm_expr_stack_create();
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
264 for (n = se -> expr -> head; n; n = n -> next)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
265 {
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
266 lwasm_expr_stack_push(rs, n -> term);
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
267 }
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
268 return rs;
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
269
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
270 retconst:
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
271 rs = lwasm_expr_stack_create();
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
272 t = lwasm_expr_term_create_int(val);
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
273 lwasm_expr_stack_push(rs, t);
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
274 lwasm_expr_term_free(t);
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
275 return rs;
37
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
276 }
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
277
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
278 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
279 {
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
280 struct symstateinfo st;
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
281
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
282 st.as = as;
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
283 st.l = l;
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
284 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
285
38
9bd584bb6296 Added debugging message infrastructure
lost
parents: 37
diff changeset
286 debug_message(2, "Evaluate expression: %s", inp);
9bd584bb6296 Added debugging message infrastructure
lost
parents: 37
diff changeset
287
37
538e15927776 Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents: 32
diff changeset
288 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
289 }
38
9bd584bb6296 Added debugging message infrastructure
lost
parents: 37
diff changeset
290
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
291
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
292 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
293 {
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
294 struct symstateinfo st;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
295
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
296 st.as = as;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
297 st.l = l;
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
298 st.flags = flags;
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
299 return(lwasm_expr_reval(s, lwasm_expr_lookup_symbol, &st));
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
300 }
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
301
76
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
302 // return 1 if no undefined symbols (externals and incompletes are okay)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
303 // return 0 if there are undefined symbols
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
304 int lwasm_expr_result_ckconst(asmstate_t *as, lwasm_expr_stack_t *s)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
305 {
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
306 lwasm_expr_stack_node_t *n;
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
307 lwasm_symbol_ent_t *se;
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
308
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
309 if (as -> outformat != OUTPUT_OBJ)
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
310 {
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
311 if (lwasm_expr_is_constant(s))
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
312 return 1;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
313 else
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
314 return 0;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
315 }
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
316
76
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
317 for (n = s -> head; n; n = n -> next)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
318 {
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
319 if (n -> term -> term_type == LWASM_TERM_SYM)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
320 {
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
321 se = lwasm_find_symbol(as, n -> term -> symbol, as -> context);
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
322 if (!se)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
323 se = lwasm_find_symbol(as, n -> term -> symbol, -1);
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
324 if (!se)
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
325 return 0;
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 return 1;
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
329 }
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
330
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
331 /*
2fe5fd7d65a3 Checkpointing object target implementation
lost
parents: 74
diff changeset
332 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
333 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
334
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
335 */
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
336 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
337 {
79
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
338 lwasm_expr_stack_t *s = NULL;
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
339 const char *ep;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
340 int rval;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
341
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
342 if ((as -> passnum == 1 && !(flag & EXPR_REEVAL)) || slot < 0)
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
343 {
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
344 s = lwasm_evaluate_expr(as, l, *inp, &ep, flag);
79
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
345 if (slot >= 0)
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
346 l -> exprs[slot] = s;
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
347 if (!s)
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 register_error(as, l, 1, "Bad expression");
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
350 *val = 0;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
351 return -1;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
352 }
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
353 *inp = (char *)ep;
79
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
354 if (slot >= 0)
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
355 {
94
83ba34ed11b3 Fixed problem with constant expressions evaluating to 0 when they shouldn't
lost
parents: 93
diff changeset
356 l -> exprends[slot] = (char *)ep;
79
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
357 l -> exprvals[slot] = lwasm_expr_get_value(s);
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
358 }
77
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 else if (l -> exprs[slot])
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 s = l -> exprs[slot];
101
f59c0916753d Fixed relative branches and PCR addressing to handle constant intra-section references properly
lost
parents: 98
diff changeset
363 lwasm_reevaluate_expr(as, l, s, flag);
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
364 l -> exprvals[slot] = lwasm_expr_get_value(s);
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
365 }
84
e12edcfbebd5 Fixed problem with expression evaluation infrastructure not advancing input pointer on pass 2
lost
parents: 79
diff changeset
366 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
367 *inp = l -> exprends[slot];
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
368
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
369 if (s && lwasm_expr_is_constant(s))
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
370 {
94
83ba34ed11b3 Fixed problem with constant expressions evaluating to 0 when they shouldn't
lost
parents: 93
diff changeset
371 *val = lwasm_expr_get_value(s);
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
372 lwasm_expr_stack_free(s);
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
373 l -> exprs[slot] = NULL;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
374 s = NULL;
94
83ba34ed11b3 Fixed problem with constant expressions evaluating to 0 when they shouldn't
lost
parents: 93
diff changeset
375 return 0;
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
376 }
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
377
79
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
378 if (!s && slot >= 0)
77
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
379 {
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
380 *val = l -> exprvals[slot];
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
381 return 0;
a338d496350e Checkpointing conversion to allow object target
lost
parents: 76
diff changeset
382 }
79
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
383 else if (!s)
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
384 {
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
385 *val = 0;
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
386 return 0;
d0ce3f5f6797 Checkpointing deployment of non-constant expression handling
lost
parents: 78
diff changeset
387 }
78
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 // was a constant result on pass 1 requested?
121bf4a588ea Checkpointing deployment of non-constant expression handling
lost
parents: 77
diff changeset
390 // that means we must have a constant on either pass
121bf4a588ea Checkpointing deployment of non-constant expression handling
lost
parents: 77
diff changeset
391 if (flag & EXPR_PASS1CONST)
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392 {
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393 *val = 0;
79
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394 if (slot >= 0)
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395 l -> exprvals[slot] = 0;
78
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396 register_error(as, l, 1, "Illegal forward, external, or inter-section reference");
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397 lwasm_expr_stack_free(s);
79
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398 if (slot >= 0)
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399 l -> exprs[slot] = NULL;
78
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400 return -1;
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401 }
77
a338d496350e Checkpointing conversion to allow object target
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402
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403 return 1;
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404 }
55
8e32696380f3 added expression evaluation and checking function
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parents: 52
diff changeset
405
38
9bd584bb6296 Added debugging message infrastructure
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parents: 37
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406 void debug_message(int level, const char *fmt, ...)
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407 {
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408 va_list args;
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409
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410 va_start(args, fmt);
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411 if (debug_level >= level)
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diff changeset
412 {
39
efa19ec69df9 tweaked debugging system for expression handler
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parents: 38
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413 if (level > 0)
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414 fprintf(stderr, "DEBUG %d: ", level);
38
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415 vfprintf(stderr, fmt, args);
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416 fputc('\n', stderr);
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417 }
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418 va_end(args);
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419 }
57
035b95a3690f Added conditional assembly and macros
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parents: 55
diff changeset
420
035b95a3690f Added conditional assembly and macros
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421 int lwasm_next_context(asmstate_t *as)
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422 {
58
b1d81800bc91 Added symbol listing to list file; various fixes
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423 int r;
b1d81800bc91 Added symbol listing to list file; various fixes
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424 r = as -> nextcontext;
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425 as -> nextcontext += 1;
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426 debug_message(3, "lwasm_next_context(): %d (%d) pass %d", r, as -> nextcontext, as -> passnum);
b1d81800bc91 Added symbol listing to list file; various fixes
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427 return r;
57
035b95a3690f Added conditional assembly and macros
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parents: 55
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428 }
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parents: 55
diff changeset
429