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annotate src/parse.c @ 64:aaddd47219b4
Added the 'set' directive
| author | lost |
|---|---|
| date | Mon, 05 Jan 2009 01:27:08 +0000 |
| parents | d85ba47b1e8f |
| children | aa9d9fedfdf4 |
| 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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538e15927776
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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
Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
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64 sym[p2 - p] = '\0'; |
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538e15927776
Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
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65 memcpy(sym, p, p2 - p); |
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Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
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66 |
| 44 | 67 p = p2; |
| 68 | |
|
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69 } |
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70 else |
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71 { |
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72 while (*p && isspace(*p)) |
| 38 | 73 p++; |
|
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74 if (!*p) |
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538e15927776
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75 { |
| 57 | 76 if (as -> inmacro == 0) |
| 77 as -> context = lwasm_next_context(as); | |
|
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78 return 0; |
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79 } |
| 36 | 80 } |
| 81 | |
| 82 // skip white space | |
| 83 while (*p && isspace(*p)) | |
| 84 p++; | |
| 85 | |
| 86 // if comment or end of line, return | |
| 87 if (!*p || *p == '*' || *p == ';') | |
|
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Added symbol handling to expression subsystem; adpated instruction handlers to the new scheme; misc fixes
lost
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88 { |
| 44 | 89 if (sym) |
| 90 lwasm_free(l -> sym); | |
| 36 | 91 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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92 } |
| 36 | 93 |
| 94 // parse the opcode | |
| 95 for (p2 = p; *p2 && !isspace(*p2); p2++) | |
| 96 /* do nothing */ ; | |
| 97 | |
| 98 opc = lwasm_alloc((p2 - p) + 1); | |
| 99 memcpy(opc, p, p2 - p); | |
| 100 opc[p2 - p] = '\0'; | |
| 101 | |
| 38 | 102 debug_message(2, "Found operation code: '%s'", opc); |
| 103 | |
| 36 | 104 // skip intervening whitespace if present |
| 105 while (*p2 && isspace(*p2)) | |
| 106 p2++; | |
| 107 | |
| 108 // look up instruction in insn table | |
| 109 for (opnum = 0; instab[opnum].opcode; opnum++) | |
| 110 { | |
| 111 if (!strcasecmp(instab[opnum].opcode, opc)) | |
| 112 break; | |
| 113 } | |
| 114 | |
| 57 | 115 if (as -> inmacro && instab[opnum].endm == 0) |
| 116 { | |
| 117 add_macro_line(as, l -> text); | |
| 118 } | |
| 119 | |
| 120 if (as -> inmacro == 0 && as -> skipcond == 0) | |
| 121 { | |
| 122 if (expand_macro(as, l, &p2, opc) == 0) | |
| 123 goto done_line; | |
| 124 } | |
| 125 | |
|
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d85ba47b1e8f
Moved symbol registration so symbols that are in skipped code do not get registered and so EQU/SET can do their own registration
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126 // register symbol if needed |
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d85ba47b1e8f
Moved symbol registration so symbols that are in skipped code do not get registered and so EQU/SET can do their own registration
lost
parents:
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127 if (as -> skipcond == 0 && as -> inmacro == 0 && sym) |
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d85ba47b1e8f
Moved symbol registration so symbols that are in skipped code do not get registered and so EQU/SET can do their own registration
lost
parents:
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128 { |
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d85ba47b1e8f
Moved symbol registration so symbols that are in skipped code do not get registered and so EQU/SET can do their own registration
lost
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129 l -> sym = sym; |
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d85ba47b1e8f
Moved symbol registration so symbols that are in skipped code do not get registered and so EQU/SET can do their own registration
lost
parents:
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130 if (as -> passnum == 1 && !(instab[opnum].opcode && instab[opnum].setsym)) |
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d85ba47b1e8f
Moved symbol registration so symbols that are in skipped code do not get registered and so EQU/SET can do their own registration
lost
parents:
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diff
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131 { |
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d85ba47b1e8f
Moved symbol registration so symbols that are in skipped code do not get registered and so EQU/SET can do their own registration
lost
parents:
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132 // have a symbol; now determine if it is valid and register it |
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d85ba47b1e8f
Moved symbol registration so symbols that are in skipped code do not get registered and so EQU/SET can do their own registration
lost
parents:
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diff
changeset
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133 // at the current address of the line |
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d85ba47b1e8f
Moved symbol registration so symbols that are in skipped code do not get registered and so EQU/SET can do their own registration
lost
parents:
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diff
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134 debug_message(1, "Registering symbol '%s' at %04X", sym, as -> addr); |
| 64 | 135 if (lwasm_register_symbol(as, l, sym, as -> addr, SYMBOL_NORM) < 0) |
|
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d85ba47b1e8f
Moved symbol registration so symbols that are in skipped code do not get registered and so EQU/SET can do their own registration
lost
parents:
57
diff
changeset
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136 l -> sym = NULL; |
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d85ba47b1e8f
Moved symbol registration so symbols that are in skipped code do not get registered and so EQU/SET can do their own registration
lost
parents:
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diff
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137 } |
|
d85ba47b1e8f
Moved symbol registration so symbols that are in skipped code do not get registered and so EQU/SET can do their own registration
lost
parents:
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138 } |
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d85ba47b1e8f
Moved symbol registration so symbols that are in skipped code do not get registered and so EQU/SET can do their own registration
lost
parents:
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139 |
| 57 | 140 if (!(instab[opnum].opcode) || !(instab[opnum].fn) && !(as -> skipcond || as -> inmacro)) |
| 36 | 141 { |
| 142 // invalid operation code, throw error | |
| 143 register_error(as, l, 1, "Invalid operation code '%s'", opc); | |
| 44 | 144 if (sym) |
| 145 lwasm_free(l -> sym); | |
| 36 | 146 lwasm_free(opc); |
| 147 return -1; | |
| 148 } | |
| 149 | |
| 57 | 150 // dispatch handler if we're not ignoring items |
| 151 if (as -> skipcond == 0 && as -> inmacro == 0 && !(instab[opnum].iscond)) | |
| 152 (instab[opnum].fn)(as, l, &p2, opnum); | |
| 153 | |
| 154 done_line: | |
| 36 | 155 lwasm_free(opc); |
| 44 | 156 if (sym) |
| 157 lwasm_free(sym); | |
| 36 | 158 } |