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annotate src/parse.c @ 44:2330b88f9600
Added simple output listing
| author | lost |
|---|---|
| date | Sun, 04 Jan 2009 06:52:18 +0000 |
| parents | 9bd584bb6296 |
| children | b9856da2674a |
| 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; |
|
37
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48 } |
| 36 | 49 |
| 44 | 50 // for output generation later |
| 51 l -> codeaddr = as -> addr; | |
| 52 | |
| 36 | 53 if (!isspace(*p) && *p != '*' && *p != ';') |
| 54 { | |
| 55 // we have a symbol specified here | |
| 56 // parse it and define | |
| 57 // need to handle local symbols here... | |
|
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58 for (p2 = p; *p2 && !isspace(*p2); p2++) |
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59 /* do nothing */ ; |
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60 |
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61 sym = lwasm_alloc((p2 - p) + 1); |
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62 sym[p2 - p] = '\0'; |
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63 memcpy(sym, p, p2 - p); |
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64 |
| 44 | 65 p = p2; |
| 66 | |
| 67 if (as -> passnum == 1) | |
| 68 { | |
| 69 l -> sym = sym; | |
| 70 // have a symbol; now determine if it is valid and register it | |
| 71 // at the current address of the line | |
| 72 debug_message(1, "Registering symbol '%s' at %04X", sym, as -> addr); | |
| 73 if (lwasm_register_symbol(as, l, sym, as -> addr) < 0) | |
| 74 l -> sym = NULL; | |
| 75 } | |
|
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76 } |
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77 else |
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78 { |
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79 while (*p && isspace(*p)) |
| 38 | 80 p++; |
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81 if (!*p) |
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82 { |
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83 as -> context += 1; |
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84 return 0; |
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85 } |
| 36 | 86 } |
| 87 | |
| 88 // skip white space | |
| 89 while (*p && isspace(*p)) | |
| 90 p++; | |
| 91 | |
| 92 // if comment or end of line, return | |
| 93 if (!*p || *p == '*' || *p == ';') | |
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94 { |
| 44 | 95 if (sym) |
| 96 lwasm_free(l -> sym); | |
| 36 | 97 return 0; |
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98 } |
| 36 | 99 |
| 100 // parse the opcode | |
| 101 for (p2 = p; *p2 && !isspace(*p2); p2++) | |
| 102 /* do nothing */ ; | |
| 103 | |
| 104 opc = lwasm_alloc((p2 - p) + 1); | |
| 105 memcpy(opc, p, p2 - p); | |
| 106 opc[p2 - p] = '\0'; | |
| 107 | |
| 38 | 108 debug_message(2, "Found operation code: '%s'", opc); |
| 109 | |
| 36 | 110 // skip intervening whitespace if present |
| 111 while (*p2 && isspace(*p2)) | |
| 112 p2++; | |
| 113 | |
| 114 // check for macro (pass 1) | |
| 115 | |
| 116 // look up instruction in insn table | |
| 117 for (opnum = 0; instab[opnum].opcode; opnum++) | |
| 118 { | |
| 119 if (!strcasecmp(instab[opnum].opcode, opc)) | |
| 120 break; | |
| 121 } | |
| 122 | |
| 123 if (!(instab[opnum].opcode) || !(instab[opnum].fn)) | |
| 124 { | |
| 125 // invalid operation code, throw error | |
| 126 register_error(as, l, 1, "Invalid operation code '%s'", opc); | |
| 44 | 127 if (sym) |
| 128 lwasm_free(l -> sym); | |
| 36 | 129 lwasm_free(opc); |
| 130 return -1; | |
| 131 } | |
| 132 | |
| 133 // dispatch handler | |
| 134 (instab[opnum].fn)(as, l, &p2, opnum); | |
| 135 | |
| 136 lwasm_free(opc); | |
| 44 | 137 if (sym) |
| 138 lwasm_free(sym); | |
| 36 | 139 } |