Mercurial > hg-old > index.cgi
annotate lwasm/pass1.c @ 344:0215a0fbf61b
Added assembly error system and additional checks for symbol syntax
| author | lost@starbug |
|---|---|
| date | Thu, 25 Mar 2010 22:06:50 -0600 |
| parents | 7b4123dce741 |
| children | 7416c3f9c321 |
| rev | line source |
|---|---|
| 332 | 1 /* |
| 2 pass1.c | |
| 3 | |
| 4 Copyright © 2010 William Astle | |
| 5 | |
| 6 This file is part of LWTOOLS. | |
| 7 | |
| 8 LWTOOLS is free software: you can redistribute it and/or modify it under the | |
| 9 terms of the GNU General Public License as published by the Free Software | |
| 10 Foundation, either version 3 of the License, or (at your option) any later | |
| 11 version. | |
| 12 | |
| 13 This program is distributed in the hope that it will be useful, but WITHOUT | |
| 14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
| 16 more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License along with | |
| 19 this program. If not, see <http://www.gnu.org/licenses/>. | |
| 20 */ | |
| 21 | |
| 22 #include <config.h> | |
| 23 | |
| 24 #include <stdio.h> | |
| 25 | |
| 26 #include <lw_alloc.h> | |
| 342 | 27 #include <lw_string.h> |
| 332 | 28 |
| 29 #include "lwasm.h" | |
| 342 | 30 #include "instab.h" |
| 332 | 31 #include "input.h" |
| 32 | |
| 337 | 33 /* |
| 34 pass 1: parse the lines | |
| 340 | 35 |
| 36 line format: | |
| 37 | |
| 38 [<symbol>] <opcode> <operand>[ <comment>] | |
| 39 | |
| 40 If <symbol> is followed by a :, whitespace may precede the symbol | |
| 41 | |
| 42 A line may optionally start with a number which must not be preceded by | |
| 43 white space and must be followed by a single whitespace character. After | |
| 44 that whitespace character, the line is parsed as if it had no line number. | |
| 45 | |
| 337 | 46 */ |
| 332 | 47 void do_pass1(asmstate_t *as) |
| 48 { | |
| 49 char *line; | |
| 337 | 50 line_t *cl; |
| 340 | 51 char *p1; |
| 342 | 52 int stspace; |
| 340 | 53 char *tok, *sym; |
| 54 int opnum; | |
| 55 | |
| 332 | 56 for (;;) |
| 57 { | |
| 340 | 58 sym = NULL; |
| 332 | 59 line = input_readline(as); |
| 60 if (!line) | |
| 61 break; | |
| 62 printf("%s\n", line); | |
| 337 | 63 |
| 64 cl = lw_alloc(sizeof(line_t)); | |
| 65 cl -> next = NULL; | |
| 66 cl -> prev = as -> line_tail; | |
| 67 cl -> len = -1; | |
| 68 cl -> insn = -1; | |
|
344
0215a0fbf61b
Added assembly error system and additional checks for symbol syntax
lost@starbug
parents:
342
diff
changeset
|
69 cl -> err = NULL; |
| 337 | 70 if (!as -> line_tail) |
| 71 { | |
| 72 as -> line_head = cl; | |
| 73 cl -> addr = lw_expr_build(lw_expr_type_int, 0); | |
| 74 } | |
| 75 else | |
| 76 { | |
| 77 lw_expr_t te; | |
| 78 as -> line_tail -> next = cl; | |
| 79 te = lw_expr_build(lw_expr_type_special, lwasm_expr_linelen, cl -> prev); | |
| 80 cl -> addr = lw_expr_build(lw_expr_type_oper, lw_expr_oper_plus, cl -> prev -> addr, te); | |
| 81 lw_expr_destroy(te); | |
| 82 lw_expr_simplify(cl -> addr); | |
| 83 } | |
| 84 as -> line_tail = cl; | |
| 85 | |
| 340 | 86 // blank lines don't count for anything |
| 87 if (!*line) | |
| 88 { | |
| 89 goto nextline; | |
| 90 } | |
| 91 | |
| 92 // skip comments | |
| 93 if (*line == '*' || *line == ';' || *line == '#') | |
| 94 goto nextline; | |
| 95 | |
| 96 p1 = line; | |
| 97 if (isdigit(*p1)) | |
| 98 { | |
| 99 // skip line number | |
| 100 while (*p1 && isdigit(*p1)) | |
| 101 p1++; | |
| 102 if (!*p1 && !isspace(*p1)) | |
| 103 p1 = line; | |
| 104 else if (*p1 && isspace(*p1)) | |
| 105 p1++; | |
| 106 } | |
| 107 | |
| 108 if (!*p1) | |
| 109 goto nextline; | |
| 110 | |
| 111 if (*p1 == '*' || *p1 == ';' || *p1 == '#') | |
| 112 goto nextline; | |
| 113 | |
| 114 if (isspace(*p1)) | |
| 115 { | |
| 116 for (; *p1 && isspace(*p1); p1++) | |
| 117 /* do nothing */ ; | |
| 118 stspace = 1; | |
| 119 } | |
| 120 else | |
| 121 stspace = 0; | |
| 122 | |
| 123 if (*p1 == '*' || *p1 == ';' || *p1 == '#' || !*p1) | |
| 124 goto nextline; | |
| 125 | |
| 342 | 126 // find the end of the first token |
| 340 | 127 for (tok = p1; *p1 && !isspace(*p1) && *p1 != ':'; p1++) |
| 128 /* do nothing */ ; | |
| 129 | |
| 130 if (*p1 == ':' || stspace == 0) | |
| 131 { | |
| 132 // have a symbol here | |
| 133 sym = lw_strndup(tok, p1 - tok); | |
| 134 if (*p1 == ':') | |
| 135 p1++; | |
| 136 for (; *p1 && isspace(*p1); p1++) | |
| 137 /* do nothing */ ; | |
| 138 | |
| 139 for (tok = p1; *p1 && !isspace(*p1); p1++) | |
| 140 /* do nothing */ ; | |
| 141 } | |
| 142 | |
| 143 cl -> sym = sym; | |
| 144 cl -> symset = 0; | |
| 145 | |
| 146 // tok points to the opcode for the line or NUL if none | |
| 147 if (*tok) | |
| 148 { | |
| 149 // look up operation code | |
| 150 sym = lw_strndup(tok, p1 - tok); | |
| 151 for (; *p1 && isspace(p1); p1++) | |
| 152 /* do nothing */ ; | |
| 153 | |
| 154 for (opnum = 0; instab[opnum].opcode; opnum++) | |
| 155 { | |
| 156 if (!strcasecmp(instab[opnum].opcode, sym)) | |
| 157 break; | |
| 158 } | |
| 159 lw_free(sym); | |
| 160 | |
| 161 // p1 points to the start of the operand | |
| 162 | |
| 163 if (instab[opnum].opcode == NULL) | |
| 164 { | |
| 165 cl -> insn = -1; | |
| 166 if (*tok != ';' && *tok != '*') | |
| 167 { | |
| 168 // bad opcode; check for macro here | |
|
344
0215a0fbf61b
Added assembly error system and additional checks for symbol syntax
lost@starbug
parents:
342
diff
changeset
|
169 lwasm_register_error(as, cl, "Bad opcode"); |
| 340 | 170 } |
| 171 } | |
| 172 else | |
| 173 { | |
| 174 cl -> insn = opnum; | |
| 175 // call parse function | |
| 176 | |
| 177 if (*p1 && !isspace(*p1)) | |
| 178 { | |
| 179 // flag bad operand error | |
|
344
0215a0fbf61b
Added assembly error system and additional checks for symbol syntax
lost@starbug
parents:
342
diff
changeset
|
180 lwasm_register_error(as, cl, "Bad operand (%s)", p1); |
| 340 | 181 } |
| 182 } | |
| 183 } | |
| 184 | |
| 185 if (cl -> sym && cl -> symset == 0) | |
| 186 { | |
| 342 | 187 printf("Register symbol %s:", sym); |
| 188 lw_expr_print(cl -> addr); | |
| 189 printf("\n"); | |
| 190 | |
| 340 | 191 // register symbol at line address |
|
344
0215a0fbf61b
Added assembly error system and additional checks for symbol syntax
lost@starbug
parents:
342
diff
changeset
|
192 if (!register_symbol(as, cl, cl -> sym, cl -> addr, symbol_flag_none)) |
| 342 | 193 { |
| 194 // symbol error | |
|
344
0215a0fbf61b
Added assembly error system and additional checks for symbol syntax
lost@starbug
parents:
342
diff
changeset
|
195 lwasm_register_error(as, cl, "Bad symbol '%s'", cl -> sym); |
| 342 | 196 } |
| 340 | 197 } |
| 198 | |
| 337 | 199 lw_expr_print(cl -> addr); |
| 200 printf("\n"); | |
| 201 // now parse the line | |
| 202 | |
| 340 | 203 nextline: |
| 332 | 204 lw_free(line); |
| 205 } | |
| 206 } |