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annotate lwasm/lwasm.h @ 198:6ddc861a07d4
Allow export to import undefined symbols
| author | lost |
|---|---|
| date | Sun, 22 Mar 2009 18:26:59 +0000 |
| parents | 563adfccb645 |
| children | 048ebb85f6ef |
| rev | line source |
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| 0 | 1 /* |
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2 lwasm.h |
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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 Contains the main defs used by the assembler |
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21 */ |
| 0 | 22 |
| 23 | |
| 24 #ifndef __lwasm_h_seen__ | |
| 25 #define __lwasm_h_seen__ | |
| 26 | |
| 58 | 27 #include <stdio.h> |
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28 #include "expr.h" |
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29 |
| 0 | 30 #define OUTPUT_DECB 0 // DECB multirecord format |
| 31 #define OUTPUT_RAW 1 // raw sequence of bytes | |
| 21 | 32 #define OUTPUT_OBJ 2 // proprietary object file format |
| 46 | 33 #define OUTPUT_RAWREL 3 // raw bytes where ORG causes a SEEK in the file |
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34 |
| 74 | 35 // structure for tracking sections |
| 86 | 36 typedef struct section_reloc_list_s section_reloc_list_t; |
| 37 struct section_reloc_list_s | |
| 38 { | |
| 39 int offset; // offset into section | |
| 40 lwasm_expr_stack_t *expr; // value definition | |
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41 int context; // symbol context (for local syms) |
| 86 | 42 section_reloc_list_t *next; // next relocation |
| 43 }; | |
| 44 | |
| 90 | 45 typedef struct export_list_s export_list_t; |
| 46 struct export_list_s | |
| 47 { | |
| 48 int offset; // offset of symbol | |
| 49 char *sym; // name of symbol | |
| 50 export_list_t *next; // next export | |
| 51 }; | |
| 52 | |
| 74 | 53 #define SECTION_BSS 1 // the section contains no actual code - just uninit vars |
| 54 typedef struct sectiontab_s sectiontab_t; | |
| 55 struct sectiontab_s | |
| 56 { | |
| 57 char *name; // name of the section | |
| 58 int offset; // current offset in the section | |
| 59 int flags; // section flags | |
| 60 sectiontab_t *next; // next section | |
| 86 | 61 // the following are used during code output |
| 85 | 62 unsigned char *obytes; // output bytes |
| 63 int oblen; // how many bytes output so far? | |
| 64 int obsize; // how big is output buffer so far? | |
| 86 | 65 section_reloc_list_t *rl; // relocation list |
| 90 | 66 export_list_t *exports; // export list for the section |
| 74 | 67 }; |
| 68 | |
| 57 | 69 // structure for tracking macros |
| 70 typedef struct macrotab_s macrotab_t; | |
| 71 struct macrotab_s | |
| 72 { | |
| 73 char *name; | |
| 74 char **lines; | |
| 75 int numlines; | |
| 76 macrotab_t *next; | |
| 77 }; | |
| 78 | |
| 26 | 79 // structure for tracking errors |
| 80 typedef struct lwasm_error_s lwasm_error_t; | |
| 81 struct lwasm_error_s | |
| 82 { | |
| 83 char *mess; // the actual error message | |
| 84 lwasm_error_t *next; // ptr to next error | |
| 85 }; | |
| 86 | |
| 21 | 87 // structure for keeping track of lines |
| 77 | 88 // it also as space for 4 expressions which is enough for all known |
| 89 // instructions and addressing modes | |
| 90 // on pass 1, the expressions are parsed, on pass 2 they are re-evaluated | |
| 91 // to determine constancy | |
| 21 | 92 typedef struct lwasm_line_s lwasm_line_t; |
| 93 struct lwasm_line_s { | |
| 94 char *text; // the actual text of the line | |
| 95 int lineno; // line number within the file | |
| 96 char *filename; // file name reference | |
| 97 lwasm_line_t *next; // next line | |
| 98 lwasm_line_t *prev; // previous line | |
| 26 | 99 lwasm_error_t *err; // error messages |
| 28 | 100 int fsize; // forced size (0 = no forced size) |
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101 char *sym; // scratch area to record the presence of a symbol |
| 42 | 102 unsigned char *bytes; // actual bytes emitted |
| 103 int codelen; // number of bytes emitted | |
| 104 int codesize; // the size of the code buffer | |
| 44 | 105 int codeaddr; // address the code goes at |
| 46 | 106 int nocodelen; // for "RMB" type instructions |
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107 int addrset; // set if this instruction sets the assembly address |
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108 int symaddr; // set if this instruction sets a symbol addr with EQU or the like |
| 67 | 109 int badop; // bad operation - ignore it |
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110 int context; // the symbol context for this line |
| 190 | 111 int forceglobal; // force a "global" symbol definition if constant |
| 74 | 112 |
| 113 // the following are used for obj format - for external references, inter-section | |
| 114 // references, and intrasection relocations | |
| 115 int relocoff; // offset into insn where relocation value goes | |
| 77 | 116 lwasm_expr_stack_t *exprs[4]; // non-constant expression values |
| 117 int exprvals[4]; // constant expression values | |
| 118 char *exprends[4]; // pointer to character after end of expression | |
| 85 | 119 |
| 120 sectiontab_t *sect; // which section is the line in? | |
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121 }; |
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122 |
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123 // for keeping track of symbols |
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124 #define SYMBOL_SET 1 // the symbol was used for "SET" |
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125 #define SYMBOL_COMPLEX 2 // register symbol as a complex symbol (from l -> expr) |
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126 #define SYMBOL_FORCE 4 // force resetting the symbol value if it already exists on pass 2 |
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127 #define SYMBOL_NORM 0 // no flags |
| 82 | 128 #define SYMBOL_EXTERN 8 // the symbol is an external reference |
| 190 | 129 #define SYMBOL_GLOBAL 16 // force global if non-complex symbol |
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130 typedef struct lwasm_symbol_ent_s lwasm_symbol_ent_t; |
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131 struct lwasm_symbol_ent_s |
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132 { |
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133 char *sym; // the symbol |
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134 int context; // the context number of the symbol (-1 for global) |
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135 int value; // the value of the symbol |
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136 int flags; // flags for the symbol |
| 82 | 137 char *externalname; // for external references that are aliased locally |
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138 sectiontab_t *sect; // the section the symbol exists in; NULL for none |
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139 lwasm_expr_stack_t *expr; // expression for a symbol that is not constant NULL for const |
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140 lwasm_symbol_ent_t *next; // next symbol in the table |
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141 lwasm_symbol_ent_t *prev; // previous symbol in the table |
| 21 | 142 }; |
| 0 | 143 |
| 144 // keep track of current assembler state | |
| 145 typedef struct { | |
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146 int dpval; // current dp value (setdp) |
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147 int addr; // current address |
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148 int context; // context counter (for local symbols) |
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149 int errorcount; // error count |
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150 int passnum; // which pass are we on? |
| 21 | 151 int execaddr; // execution address for the program (END ....) |
| 152 int pragmas; // what pragmas are in effect? | |
| 153 | |
| 154 lwasm_line_t *lineshead; // first line of source code | |
| 155 lwasm_line_t *linestail; // last line of source code | |
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156 |
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157 lwasm_symbol_ent_t *symhead; // first entry in symbol table |
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158 lwasm_symbol_ent_t *symtail; // last entry in symbol table |
| 57 | 159 |
| 160 macrotab_t *macros; // macro table | |
| 21 | 161 |
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162 const char *infile; // input file |
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163 const char *outfile; // output file |
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164 const char *listfile; // output listing file |
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165 int outformat; // output format type |
| 21 | 166 char **filelist; // files that have been read |
| 167 int filelistlen; // number of files in the list | |
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168 |
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169 int endseen; // set to true if "end" has been seen |
| 57 | 170 int skipcond; // skipping a condition? |
| 171 int skipcount; // how many? | |
| 172 int skipmacro; // skipping a macro? | |
| 173 int inmacro; // are we currently in a macro? | |
| 174 int macroex; // current depth of macro expansion | |
| 175 int nextcontext; // next context number | |
| 176 int skiplines; // number of lines to skip | |
| 74 | 177 |
| 178 // items used only for the "object" target | |
| 179 sectiontab_t *sections; // pointer to section table | |
| 180 sectiontab_t *csect; // current section - NULL if not in one | |
| 0 | 181 } asmstate_t; |
| 182 | |
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183 // do not rewrite XXX,r to ,r if XXX evaluates to 0 |
| 0 | 184 #define PRAGMA_NOINDEX0TONONE 1 |
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185 // any undefined symbols are considered external |
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186 #define PRAGMA_UNDEFEXTERN 2 |
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187 // allow C-style escapes in fcc, fcs, and fcn directives |
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188 #define PRAGMA_CESCAPES 4 |
| 0 | 189 |
| 198 | 190 // allow "export <undefsym>" to import the symbol |
| 191 #define PRAGMA_IMPORTUNDEFEXPORT 8 | |
| 192 | |
| 26 | 193 #ifndef __lwasm_c_seen__ |
| 194 #define __lwasm_E__ extern | |
| 195 #else | |
| 196 #define __lwasm_E__ | |
| 197 #endif | |
| 198 | |
| 38 | 199 __lwasm_E__ int debug_level; |
| 200 | |
| 26 | 201 __lwasm_E__ int register_error(asmstate_t *as, lwasm_line_t *l, int pass, const char *fmt, ...); |
| 38 | 202 __lwasm_E__ void debug_message(int level, const char *fmt, ...); |
| 26 | 203 |
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204 __lwasm_E__ void lwasm_emit(asmstate_t *as, lwasm_line_t *l, int b); |
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205 __lwasm_E__ void lwasm_emitop(asmstate_t *as, lwasm_line_t *l, int o); |
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206 __lwasm_E__ int lwasm_lookupreg2(const char *reglist, char **str); |
| 32 | 207 __lwasm_E__ int lwasm_lookupreg3(const char *rlist, const char **str); |
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208 |
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209 __lwasm_E__ lwasm_expr_stack_t *lwasm_evaluate_expr(asmstate_t *as, lwasm_line_t *l, const char *inp, const char **outp, int flags); |
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210 |
| 55 | 211 |
| 57 | 212 // return next context number and update it |
| 213 __lwasm_E__ int lwasm_next_context(asmstate_t *as); | |
| 214 | |
| 55 | 215 // also throw an error on expression eval failure |
| 76 | 216 // return 0 on ok, -1 on error, 1 if a complex expression was returned |
| 55 | 217 #define EXPR_NOFLAG 0 |
| 76 | 218 #define EXPR_PASS1CONST 1 // no forward references on pass 1 |
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219 #define EXPR_SECTCONST 2 // resolve symbols local to section |
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220 #define EXPR_REEVAL 4 // re-evaluate the expression |
| 55 | 221 __lwasm_E__ int lwasm_expr_result(asmstate_t *as, lwasm_line_t *l, char **inp, int flag, int *val); |
| 77 | 222 __lwasm_E__ int lwasm_expr_result2(asmstate_t *as, lwasm_line_t *l, char **inp, int flag, int *val, int slot); |
| 55 | 223 |
| 26 | 224 #undef __lwasm_E__ |
| 225 | |
| 226 | |
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227 #ifndef __symbol_c_seen__ |
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228 #define __lwasm_E__ extern |
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229 #else |
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230 #define __lwasm_E__ |
| 0 | 231 #endif |
| 232 | |
| 64 | 233 __lwasm_E__ int lwasm_register_symbol(asmstate_t *as, lwasm_line_t *l, char *sym, int val, int flags); |
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234 __lwasm_E__ lwasm_symbol_ent_t *lwasm_find_symbol(asmstate_t *as, char *sym, int scontext); |
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235 __lwasm_E__ int lwasm_set_symbol(asmstate_t *as, char *sym, int scontext, int val); |
| 58 | 236 __lwasm_E__ void lwasm_list_symbols(asmstate_t *as, FILE *f); |
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237 #undef __lwasm_E__ |
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238 |
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239 |
| 0 | 240 |
| 241 #endif //__lwasm_h_seen__ |