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annotate src/parse.c @ 57:035b95a3690f
Added conditional assembly and macros
| author | lost |
|---|---|
| date | Mon, 05 Jan 2009 00:01:21 +0000 |
| parents | b9856da2674a |
| children | d85ba47b1e8f |
| 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
538e15927776
Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
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45 { |
| 57 | 46 if (as -> inmacro == 0) |
| 47 as -> context = lwasm_next_context(as); | |
| 36 | 48 return 0; |
|
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49 } |
| 36 | 50 |
| 52 | 51 // for output generation later but only on pass 1 |
| 52 if (as -> passnum == 1) | |
| 53 l -> codeaddr = as -> addr; | |
| 44 | 54 |
| 36 | 55 if (!isspace(*p) && *p != '*' && *p != ';') |
| 56 { | |
| 57 // we have a symbol specified here | |
| 58 // parse it and define | |
| 59 // need to handle local symbols here... | |
|
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60 for (p2 = p; *p2 && !isspace(*p2); p2++) |
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61 /* do nothing */ ; |
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62 |
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63 sym = lwasm_alloc((p2 - p) + 1); |
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538e15927776
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64 sym[p2 - p] = '\0'; |
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538e15927776
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65 memcpy(sym, p, p2 - p); |
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538e15927776
Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents:
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diff
changeset
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66 |
| 44 | 67 p = p2; |
| 68 | |
| 69 if (as -> passnum == 1) | |
| 70 { | |
| 71 l -> sym = sym; | |
| 72 // have a symbol; now determine if it is valid and register it | |
| 73 // at the current address of the line | |
| 74 debug_message(1, "Registering symbol '%s' at %04X", sym, as -> addr); | |
| 75 if (lwasm_register_symbol(as, l, sym, as -> addr) < 0) | |
| 76 l -> sym = NULL; | |
| 77 } | |
|
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parents:
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78 } |
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538e15927776
Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
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parents:
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79 else |
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80 { |
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81 while (*p && isspace(*p)) |
| 38 | 82 p++; |
|
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538e15927776
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parents:
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83 if (!*p) |
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538e15927776
Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents:
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diff
changeset
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84 { |
| 57 | 85 if (as -> inmacro == 0) |
| 86 as -> context = lwasm_next_context(as); | |
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87 return 0; |
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538e15927776
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parents:
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88 } |
| 36 | 89 } |
| 90 | |
| 91 // skip white space | |
| 92 while (*p && isspace(*p)) | |
| 93 p++; | |
| 94 | |
| 95 // if comment or end of line, return | |
| 96 if (!*p || *p == '*' || *p == ';') | |
|
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538e15927776
Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents:
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diff
changeset
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97 { |
| 44 | 98 if (sym) |
| 99 lwasm_free(l -> sym); | |
| 36 | 100 return 0; |
|
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538e15927776
Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
parents:
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diff
changeset
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101 } |
| 36 | 102 |
| 103 // parse the opcode | |
| 104 for (p2 = p; *p2 && !isspace(*p2); p2++) | |
| 105 /* do nothing */ ; | |
| 106 | |
| 107 opc = lwasm_alloc((p2 - p) + 1); | |
| 108 memcpy(opc, p, p2 - p); | |
| 109 opc[p2 - p] = '\0'; | |
| 110 | |
| 38 | 111 debug_message(2, "Found operation code: '%s'", opc); |
| 112 | |
| 36 | 113 // skip intervening whitespace if present |
| 114 while (*p2 && isspace(*p2)) | |
| 115 p2++; | |
| 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 | |
| 57 | 124 if (as -> inmacro && instab[opnum].endm == 0) |
| 125 { | |
| 126 add_macro_line(as, l -> text); | |
| 127 } | |
| 128 | |
| 129 if (as -> inmacro == 0 && as -> skipcond == 0) | |
| 130 { | |
| 131 if (expand_macro(as, l, &p2, opc) == 0) | |
| 132 goto done_line; | |
| 133 } | |
| 134 | |
| 135 if (!(instab[opnum].opcode) || !(instab[opnum].fn) && !(as -> skipcond || as -> inmacro)) | |
| 36 | 136 { |
| 137 // invalid operation code, throw error | |
| 138 register_error(as, l, 1, "Invalid operation code '%s'", opc); | |
| 44 | 139 if (sym) |
| 140 lwasm_free(l -> sym); | |
| 36 | 141 lwasm_free(opc); |
| 142 return -1; | |
| 143 } | |
| 144 | |
| 57 | 145 // dispatch handler if we're not ignoring items |
| 146 if (as -> skipcond == 0 && as -> inmacro == 0 && !(instab[opnum].iscond)) | |
| 147 (instab[opnum].fn)(as, l, &p2, opnum); | |
| 148 | |
| 149 done_line: | |
| 36 | 150 lwasm_free(opc); |
| 44 | 151 if (sym) |
| 152 lwasm_free(sym); | |
| 36 | 153 } |