annotate lwasm/parse.c @ 232:1009f302ac11

Documented the "Flags" term for object files
author lost
date Fri, 12 Jun 2009 04:17:22 +0000
parents 0df2a39a268c
children a58f49a77441
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1 /*
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2 parse.c
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3 Copyright © 2008 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 /*
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22 Contains the general parser
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23 */
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24
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25 #define __parse_c_seen__
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26 #include <config.h>
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27
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28 #include <ctype.h>
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29 #include <string.h>
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30
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31 #include "lwasm.h"
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32 #include "instab.h"
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33 #include "util.h"
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34
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35 // parse a line and despatch to the appropriate handlers for opcodes
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36 int lwasm_parse_line(asmstate_t *as, lwasm_line_t *l)
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37 {
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38 char *p, *p2;
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39 char *opc;
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40 int opnum;
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41 char *sym = NULL;
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42
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43 // if this was a bad op first pass (or otherwise a no-process line)
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44 // ignore it
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45 if (l -> badop)
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46 return;
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47
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48 p = l -> text;
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49 l -> sect = as -> csect;
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50
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51 // blank lines are a no brainer
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52 if (!*p)
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53 {
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54 as -> context = lwasm_next_context(as);
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55 return 0;
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56 }
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57
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58 // for output generation later but only on pass 1
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59 // also used by some pseudo ops on pass 2
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60 if (as -> passnum == 1)
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61 l -> codeaddr = as -> addr;
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62
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63 // if it's a comment, return (this doesn't cause a context change)
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64 if (*p == '*' || *p == ';')
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65 return;
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66
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67 // if we have C pre-processor directives/output, ignore it
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68 if (*p == '#')
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69 return;
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70
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71 // if we start with a non-space character, it's a symbol
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72 if (!isspace(*p))
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73 {
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74 // we have a symbol specified here
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75 // parse it out and record it for later use
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76 for (p2 = p; *p2 && !isspace(*p2) && *p2 != ':'; p2++)
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77 /* do nothing */ ;
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78
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79 sym = lwasm_alloc((p2 - p) + 1);
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80 sym[p2 - p] = '\0';
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81 memcpy(sym, p, p2 - p);
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82
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83 p = p2;
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84 if (!*sym)
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85 {
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86 register_error(as, l, 1, "Invalid symbol");
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87 lwasm_free(sym);
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88 sym = NULL;
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89 }
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90 if (*p == ':')
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91 p++;
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92 }
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93 l -> sym = sym;
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94
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95 // now skip any whitespace to find the opcode
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96 while (*p && isspace(*p))
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97 p++;
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98
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99 // is the line blank?
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100 if (!*p && !sym)
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101 {
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102 // nothing but white space *is* a context break
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103 as -> context = lwasm_next_context(as);
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104 return;
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105 }
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106
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107 // parse the opcode
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108 for (p2 = p; *p2 && !isspace(*p2); p2++)
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109 /* do nothing */ ;
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110
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111 opc = lwasm_alloc((p2 - p) + 1);
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112 memcpy(opc, p, p2 - p);
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113 opc[p2 - p] = '\0';
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114
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115 l -> forceglobal = 0;
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116 // if the opcode contains an =, treat it as "symbol = expr"
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117 if (!sym && strchr(opc, '='))
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118 {
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119 for (p2 = opc; *p2 && *p2 != '='; p2++)
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120 /* do nothing */ ;
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121 sym = lwasm_alloc((p2 - opc) + 1);
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122 memcpy(sym, opc, p2 - opc);
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123 sym[p2 - opc] = '\0';
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124 l -> sym = sym;
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125
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126 p2 = p + (p2 - opc) + 1;
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127 // p2++;
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128 opc[0] = '=';
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129 opc[1] = '\0';
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130 debug_message(2, "Found opcode = with symbol %s and operand %s", sym, p2);
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131 l -> forceglobal = 1;
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132 }
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133
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134 debug_message(2, "Found operation code: '%s'", opc);
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135
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136 // skip intervening whitespace if present
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137 while (*p2 && isspace(*p2))
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138 p2++;
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139
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140 // look up instruction in insn table
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141 for (opnum = 0; instab[opnum].opcode; opnum++)
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142 {
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143 if (!strcasecmp(instab[opnum].opcode, opc))
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144 break;
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145 }
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146
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147 // if we found no operation, check if we had a comment
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148 // the reason this check is here is to allow for "private"
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149 // operation codes like "*pragma" which will be ignored by
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150 // other assemblers
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151 // also skip empty ops
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152 if (!(instab[opnum].opcode))
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153 {
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154 if (*opc == '*' || *opc == ';' || !*opc)
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155 goto done_line;
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156 }
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157
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158 // now we have the opcode and the symbol, we can decide if we're
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159 // actually going to do anything with this line
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160
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161 // we will NOT call the function if any of the following are true:
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162
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163 // - we are skipping a condition and the operation code is not a conditional
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164 // - we are defining a macro and the operation code is not ENDM
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165
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166 // we will call the function in any other circumstance
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167
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168 // first condition above
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169 if (as -> inmacro && instab[opnum].endm == 0)
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170 {
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171 add_macro_line(as, l -> text);
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172 goto done_line;
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173 }
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174
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175 // second condition above
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176 if (as -> skipcond && instab[opnum].iscond == 0)
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177 goto done_line;
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178
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179 // we've registered the symbol as needed
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180 // now we need to check for a macro call IFF we don't collide with
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181 // an operation code; otherwise, call the operation function
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182 if (instab[opnum].opcode)
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183 {
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184 if (instab[opnum].fn && !(as -> no6309 && instab[opnum].is6309))
66
aa9d9fedfdf4 Redid lwasm_parse_line() to correct overly complex logic flaws
lost
parents: 64
diff changeset
185 {
aa9d9fedfdf4 Redid lwasm_parse_line() to correct overly complex logic flaws
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parents: 64
diff changeset
186 (instab[opnum].fn)(as, l, &p2, opnum);
223
436b36214e35 Fixed lack of error when there are extraneous characters at the end of the operand.
lost
parents: 212
diff changeset
187
436b36214e35 Fixed lack of error when there are extraneous characters at the end of the operand.
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parents: 212
diff changeset
188 // if we didn't end on a "space" character or EOL, throw error
230
0df2a39a268c Added --6809/--6309 switches and some cleanups in error reporting
lost
parents: 223
diff changeset
189 if (*p2 && !isspace(*p2) && !(l -> err))
223
436b36214e35 Fixed lack of error when there are extraneous characters at the end of the operand.
lost
parents: 212
diff changeset
190 register_error(as, l, 1, "Bad operand");
66
aa9d9fedfdf4 Redid lwasm_parse_line() to correct overly complex logic flaws
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parents: 64
diff changeset
191 }
aa9d9fedfdf4 Redid lwasm_parse_line() to correct overly complex logic flaws
lost
parents: 64
diff changeset
192 else
aa9d9fedfdf4 Redid lwasm_parse_line() to correct overly complex logic flaws
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parents: 64
diff changeset
193 {
aa9d9fedfdf4 Redid lwasm_parse_line() to correct overly complex logic flaws
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parents: 64
diff changeset
194 // carp about unimplemented operation
230
0df2a39a268c Added --6809/--6309 switches and some cleanups in error reporting
lost
parents: 223
diff changeset
195 if (instab[opnum].is6309)
0df2a39a268c Added --6809/--6309 switches and some cleanups in error reporting
lost
parents: 223
diff changeset
196 register_error(as, l, 1, "Use of 6309 operation code: %s", opc);
0df2a39a268c Added --6809/--6309 switches and some cleanups in error reporting
lost
parents: 223
diff changeset
197 else
0df2a39a268c Added --6809/--6309 switches and some cleanups in error reporting
lost
parents: 223
diff changeset
198 register_error(as, l, 1, "Unimplemented operation code: %s", opc);
66
aa9d9fedfdf4 Redid lwasm_parse_line() to correct overly complex logic flaws
lost
parents: 64
diff changeset
199 }
36
99e3b3310bac Added missing parse.c file to repository
lost
parents:
diff changeset
200 }
66
aa9d9fedfdf4 Redid lwasm_parse_line() to correct overly complex logic flaws
lost
parents: 64
diff changeset
201 else
aa9d9fedfdf4 Redid lwasm_parse_line() to correct overly complex logic flaws
lost
parents: 64
diff changeset
202 {
aa9d9fedfdf4 Redid lwasm_parse_line() to correct overly complex logic flaws
lost
parents: 64
diff changeset
203 if (expand_macro(as, l, &p2, opc) == 0)
aa9d9fedfdf4 Redid lwasm_parse_line() to correct overly complex logic flaws
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parents: 64
diff changeset
204 goto done_line;
36
99e3b3310bac Added missing parse.c file to repository
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parents:
diff changeset
205
66
aa9d9fedfdf4 Redid lwasm_parse_line() to correct overly complex logic flaws
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parents: 64
diff changeset
206 // carp about an unknown operation code and note that fact for
aa9d9fedfdf4 Redid lwasm_parse_line() to correct overly complex logic flaws
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parents: 64
diff changeset
207 // pass 2 in case a macro appears later with the same name!
aa9d9fedfdf4 Redid lwasm_parse_line() to correct overly complex logic flaws
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parents: 64
diff changeset
208 register_error(as, l, 1, "Uknown operation code: %s", opc);
aa9d9fedfdf4 Redid lwasm_parse_line() to correct overly complex logic flaws
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parents: 64
diff changeset
209 l -> badop = 1;
aa9d9fedfdf4 Redid lwasm_parse_line() to correct overly complex logic flaws
lost
parents: 64
diff changeset
210 }
57
035b95a3690f Added conditional assembly and macros
lost
parents: 52
diff changeset
211
035b95a3690f Added conditional assembly and macros
lost
parents: 52
diff changeset
212 done_line:
68
cef25b0088e6 Fixed some problems detected by valgrind and testing
lost
parents: 66
diff changeset
213 if (!(as -> skipcond || as -> inmacro))
cef25b0088e6 Fixed some problems detected by valgrind and testing
lost
parents: 66
diff changeset
214 {
cef25b0088e6 Fixed some problems detected by valgrind and testing
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parents: 66
diff changeset
215 // register symbol if the operation didn't
cef25b0088e6 Fixed some problems detected by valgrind and testing
lost
parents: 66
diff changeset
216 if (sym && instab[opnum].setsym == 0)
cef25b0088e6 Fixed some problems detected by valgrind and testing
lost
parents: 66
diff changeset
217 {
cef25b0088e6 Fixed some problems detected by valgrind and testing
lost
parents: 66
diff changeset
218 if (as -> passnum == 1)
cef25b0088e6 Fixed some problems detected by valgrind and testing
lost
parents: 66
diff changeset
219 {
71
90a5657d5408 Fixed problem with symbols being registered with the address of the NEXT instruction
lost
parents: 68
diff changeset
220 debug_message(1, "Registering symbol '%s' at %04X", sym, l -> codeaddr);
90a5657d5408 Fixed problem with symbols being registered with the address of the NEXT instruction
lost
parents: 68
diff changeset
221 if (lwasm_register_symbol(as, l, sym, l -> codeaddr, SYMBOL_NORM) < 0)
68
cef25b0088e6 Fixed some problems detected by valgrind and testing
lost
parents: 66
diff changeset
222 l -> sym = NULL;
cef25b0088e6 Fixed some problems detected by valgrind and testing
lost
parents: 66
diff changeset
223 else
cef25b0088e6 Fixed some problems detected by valgrind and testing
lost
parents: 66
diff changeset
224 l -> addrset = 1;
cef25b0088e6 Fixed some problems detected by valgrind and testing
lost
parents: 66
diff changeset
225 }
cef25b0088e6 Fixed some problems detected by valgrind and testing
lost
parents: 66
diff changeset
226 }
cef25b0088e6 Fixed some problems detected by valgrind and testing
lost
parents: 66
diff changeset
227 }
99
3dcb12a6f4ff Fixed problem handling sections with options on pass 2
lost
parents: 91
diff changeset
228
85
918be0c02239 Started adding object target output
lost
parents: 71
diff changeset
229 l -> sect = as -> csect;
91
718998b673ee Added incomplete references to object output and added support for section base terms in expression handler
lost
parents: 85
diff changeset
230 l -> context = as -> context;
85
918be0c02239 Started adding object target output
lost
parents: 71
diff changeset
231
36
99e3b3310bac Added missing parse.c file to repository
lost
parents:
diff changeset
232 lwasm_free(opc);
44
2330b88f9600 Added simple output listing
lost
parents: 38
diff changeset
233 if (sym)
2330b88f9600 Added simple output listing
lost
parents: 38
diff changeset
234 lwasm_free(sym);
36
99e3b3310bac Added missing parse.c file to repository
lost
parents:
diff changeset
235 }