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annotate src/symtab.c @ 6:e91b8529b920 1.0
Created branch for 1.0 series releases
| author | lost |
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| date | Sat, 04 Oct 2008 03:24:01 +0000 |
| parents | 34568fab6058 |
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| rev | line source |
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| 0 | 1 /* |
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2 symtab.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 Implements code for handling the symbol table. |
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21 */ |
| 0 | 22 |
| 23 #include <ctype.h> | |
| 24 #include <errno.h> | |
| 25 #include <stdio.h> | |
| 26 #include <stdlib.h> | |
| 27 #include <string.h> | |
| 28 #define __symtab_c_seen__ | |
| 29 #include "lwasm.h" | |
| 30 | |
| 31 void register_symbol(asmstate_t *as, sourceline_t *cl, char *symstr, int val, int flags) | |
| 32 { | |
| 33 symtab_t *st; | |
| 34 symtab_t *prev; | |
| 35 int cv = -2; | |
| 36 | |
| 37 for (prev = NULL, st = as -> symbol_table; st; st = st -> next) | |
| 38 { | |
| 39 cv = strcasecmp(st -> symbol, symstr); | |
| 40 if (cv == 0) | |
| 41 { | |
| 42 cv = strcmp(st -> symbol, symstr); | |
| 43 } | |
| 44 if (cv >= 0) | |
| 45 break; | |
| 46 prev = st; | |
| 47 } | |
| 48 // cv is 0 if we found the symbol, > 0 if we didn't and found one | |
| 49 // later in order, or -2 if we never did a comparison | |
| 50 // if st is NULL, the value of cv is irrelevant as it means | |
| 51 // we fell off the end of the list | |
| 52 // if st is NULL and prev is not, then prev is the tail of the list | |
| 53 // if both are NULL, the list is empty | |
| 54 | |
| 55 // handle adding the symbol if needed | |
| 56 if (!st || cv != 0) | |
| 57 { | |
| 58 symtab_t *st2; | |
| 59 // register the symbol | |
| 60 st2 = malloc(sizeof(symtab_t)); | |
| 61 st2 -> symbol = strdup(symstr); | |
| 62 st2 -> addr = val; | |
| 63 st2 -> flags = 0; | |
| 64 if (flags & SYMFLAG_SET) | |
| 65 st2 -> flags |= SYMFLAG_SET; | |
| 66 | |
| 67 if (prev) | |
| 68 prev -> next = st2; | |
| 69 else | |
| 70 as -> symbol_table = st2; | |
| 71 | |
| 72 st2 -> next = st; | |
| 73 return; | |
| 74 } | |
| 75 | |
| 76 // st is NOT NULL here and cv IS 0 | |
| 77 if ((flags & SYMFLAG_SET) && ((st -> flags) & SYMFLAG_SET)) | |
| 78 { | |
| 79 // symbol already exists but it is a "SET" symbol so reset the value | |
| 80 st -> addr = val; | |
| 81 return; | |
| 82 } | |
| 83 if (st && as -> passnum == 1) | |
| 84 { | |
| 85 // duplicate symbol, flag error | |
| 86 errorp1(ERR_DUPSYM); | |
| 87 } | |
| 88 if (st -> addr != val) | |
| 89 errorp2(ERR_PHASE); | |
| 90 } | |
| 91 | |
| 92 int lookup_symbol(asmstate_t *as, char *symstr) | |
| 93 { | |
| 94 symtab_t *st; | |
| 95 | |
| 96 for (st = as -> symbol_table; st; st = st -> next) | |
| 97 { | |
| 98 if (!strcmp(symstr, st -> symbol)) | |
| 99 break; | |
| 100 } | |
| 101 if (st) | |
| 102 return st -> addr; | |
| 103 return -1; | |
| 104 } | |
| 105 | |
| 106 void list_symbols(asmstate_t *as, FILE *f) | |
| 107 { | |
| 108 symtab_t *st; | |
| 109 for (st = as -> symbol_table; st; st = st -> next) | |
| 110 { | |
| 111 fprintf(f, "%04X %s%s\n", st -> addr, st -> symbol, (st -> flags & SYMFLAG_SET) ? "(S)" : ""); | |
| 112 } | |
| 113 } |