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annotate src/parse.c @ 52:b9856da2674a
Added file inclusion
| author | lost |
|---|---|
| date | Sun, 04 Jan 2009 20:16:38 +0000 |
| parents | 2330b88f9600 |
| children | 035b95a3690f |
| rev | line source |
|---|---|
| 36 | 1 /* |
| 2 parse.c | |
| 3 Copyright © 2008 William Astle | |
| 4 | |
| 5 This file is part of LWASM. | |
| 6 | |
| 7 LWASM is free software: you can redistribute it and/or modify it under the | |
| 8 terms of the GNU General Public License as published by the Free Software | |
| 9 Foundation, either version 3 of the License, or (at your option) any later | |
| 10 version. | |
| 11 | |
| 12 This program is distributed in the hope that it will be useful, but WITHOUT | |
| 13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
| 15 more details. | |
| 16 | |
| 17 You should have received a copy of the GNU General Public License along with | |
| 18 this program. If not, see <http://www.gnu.org/licenses/>. | |
| 19 */ | |
| 20 | |
| 21 /* | |
| 22 Contains the general parser | |
| 23 */ | |
| 24 | |
| 25 #define __parse_c_seen__ | |
| 26 | |
| 27 #include <ctype.h> | |
| 28 #include <string.h> | |
| 29 | |
| 30 #include "lwasm.h" | |
| 31 #include "instab.h" | |
| 32 #include "util.h" | |
| 33 | |
| 34 // parse a line and despatch to the appropriate handlers for opcodes | |
| 35 int lwasm_parse_line(asmstate_t *as, lwasm_line_t *l) | |
| 36 { | |
| 37 char *p, *p2; | |
| 38 char *opc; | |
| 39 int opnum; | |
| 44 | 40 char *sym = NULL; |
| 36 | 41 |
| 42 p = l -> text; | |
| 43 | |
| 44 if (!*p) | |
|
37
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45 { |
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46 as -> context += 1; |
| 36 | 47 return 0; |
|
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48 } |
| 36 | 49 |
| 52 | 50 // for output generation later but only on pass 1 |
| 51 if (as -> passnum == 1) | |
| 52 l -> codeaddr = as -> addr; | |
| 44 | 53 |
| 36 | 54 if (!isspace(*p) && *p != '*' && *p != ';') |
| 55 { | |
| 56 // we have a symbol specified here | |
| 57 // parse it and define | |
| 58 // need to handle local symbols here... | |
|
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59 for (p2 = p; *p2 && !isspace(*p2); p2++) |
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60 /* do nothing */ ; |
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61 |
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62 sym = lwasm_alloc((p2 - p) + 1); |
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63 sym[p2 - p] = '\0'; |
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64 memcpy(sym, p, p2 - p); |
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65 |
| 44 | 66 p = p2; |
| 67 | |
| 68 if (as -> passnum == 1) | |
| 69 { | |
| 70 l -> sym = sym; | |
| 71 // have a symbol; now determine if it is valid and register it | |
| 72 // at the current address of the line | |
| 73 debug_message(1, "Registering symbol '%s' at %04X", sym, as -> addr); | |
| 74 if (lwasm_register_symbol(as, l, sym, as -> addr) < 0) | |
| 75 l -> sym = NULL; | |
| 76 } | |
|
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77 } |
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78 else |
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79 { |
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80 while (*p && isspace(*p)) |
| 38 | 81 p++; |
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82 if (!*p) |
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83 { |
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84 as -> context += 1; |
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85 return 0; |
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86 } |
| 36 | 87 } |
| 88 | |
| 89 // skip white space | |
| 90 while (*p && isspace(*p)) | |
| 91 p++; | |
| 92 | |
| 93 // if comment or end of line, return | |
| 94 if (!*p || *p == '*' || *p == ';') | |
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95 { |
| 44 | 96 if (sym) |
| 97 lwasm_free(l -> sym); | |
| 36 | 98 return 0; |
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99 } |
| 36 | 100 |
| 101 // parse the opcode | |
| 102 for (p2 = p; *p2 && !isspace(*p2); p2++) | |
| 103 /* do nothing */ ; | |
| 104 | |
| 105 opc = lwasm_alloc((p2 - p) + 1); | |
| 106 memcpy(opc, p, p2 - p); | |
| 107 opc[p2 - p] = '\0'; | |
| 108 | |
| 38 | 109 debug_message(2, "Found operation code: '%s'", opc); |
| 110 | |
| 36 | 111 // skip intervening whitespace if present |
| 112 while (*p2 && isspace(*p2)) | |
| 113 p2++; | |
| 114 | |
| 115 // check for macro (pass 1) | |
| 116 | |
| 117 // look up instruction in insn table | |
| 118 for (opnum = 0; instab[opnum].opcode; opnum++) | |
| 119 { | |
| 120 if (!strcasecmp(instab[opnum].opcode, opc)) | |
| 121 break; | |
| 122 } | |
| 123 | |
| 124 if (!(instab[opnum].opcode) || !(instab[opnum].fn)) | |
| 125 { | |
| 126 // invalid operation code, throw error | |
| 127 register_error(as, l, 1, "Invalid operation code '%s'", opc); | |
| 44 | 128 if (sym) |
| 129 lwasm_free(l -> sym); | |
| 36 | 130 lwasm_free(opc); |
| 131 return -1; | |
| 132 } | |
| 133 | |
| 134 // dispatch handler | |
| 135 (instab[opnum].fn)(as, l, &p2, opnum); | |
| 136 | |
| 137 lwasm_free(opc); | |
| 44 | 138 if (sym) |
| 139 lwasm_free(sym); | |
| 36 | 140 } |