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annotate src/lwasm.h @ 86:033a328a10ae
Checkpoint: object target output
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date | Fri, 16 Jan 2009 05:33:40 +0000 |
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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 | |
41 section_reloc_list_t *next; // next relocation | |
42 }; | |
43 | |
74 | 44 #define SECTION_BSS 1 // the section contains no actual code - just uninit vars |
45 typedef struct sectiontab_s sectiontab_t; | |
46 struct sectiontab_s | |
47 { | |
48 char *name; // name of the section | |
49 int offset; // current offset in the section | |
50 int flags; // section flags | |
51 sectiontab_t *next; // next section | |
86 | 52 // the following are used during code output |
85 | 53 unsigned char *obytes; // output bytes |
54 int oblen; // how many bytes output so far? | |
55 int obsize; // how big is output buffer so far? | |
86 | 56 section_reloc_list_t *rl; // relocation list |
74 | 57 }; |
58 | |
57 | 59 // structure for tracking macros |
60 typedef struct macrotab_s macrotab_t; | |
61 struct macrotab_s | |
62 { | |
63 char *name; | |
64 char **lines; | |
65 int numlines; | |
66 macrotab_t *next; | |
67 }; | |
68 | |
26 | 69 // structure for tracking errors |
70 typedef struct lwasm_error_s lwasm_error_t; | |
71 struct lwasm_error_s | |
72 { | |
73 char *mess; // the actual error message | |
74 lwasm_error_t *next; // ptr to next error | |
75 }; | |
76 | |
21 | 77 // structure for keeping track of lines |
77 | 78 // it also as space for 4 expressions which is enough for all known |
79 // instructions and addressing modes | |
80 // on pass 1, the expressions are parsed, on pass 2 they are re-evaluated | |
81 // to determine constancy | |
21 | 82 typedef struct lwasm_line_s lwasm_line_t; |
83 struct lwasm_line_s { | |
84 char *text; // the actual text of the line | |
85 int lineno; // line number within the file | |
86 char *filename; // file name reference | |
87 lwasm_line_t *next; // next line | |
88 lwasm_line_t *prev; // previous line | |
26 | 89 lwasm_error_t *err; // error messages |
28 | 90 int fsize; // forced size (0 = no forced size) |
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91 char *sym; // scratch area to record the presence of a symbol |
42 | 92 unsigned char *bytes; // actual bytes emitted |
93 int codelen; // number of bytes emitted | |
94 int codesize; // the size of the code buffer | |
44 | 95 int codeaddr; // address the code goes at |
46 | 96 int nocodelen; // for "RMB" type instructions |
49
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97 int addrset; // set if this instruction sets the assembly address |
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98 int symaddr; // set if this instruction sets a symbol addr with EQU or the like |
67 | 99 int badop; // bad operation - ignore it |
74 | 100 |
101 // the following are used for obj format - for external references, inter-section | |
102 // references, and intrasection relocations | |
103 int relocoff; // offset into insn where relocation value goes | |
77 | 104 lwasm_expr_stack_t *exprs[4]; // non-constant expression values |
105 int exprvals[4]; // constant expression values | |
106 char *exprends[4]; // pointer to character after end of expression | |
85 | 107 |
108 sectiontab_t *sect; // which section is the line in? | |
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109 }; |
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110 |
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111 // for keeping track of symbols |
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112 #define SYMBOL_SET 1 // the symbol was used for "SET" |
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113 #define SYMBOL_COMPLEX 2 // register symbol as a complex symbol (from l -> expr) |
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114 #define SYMBOL_FORCE 4 // force resetting the symbol value if it already exists on pass 2 |
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115 #define SYMBOL_NORM 0 // no flags |
82 | 116 #define SYMBOL_EXTERN 8 // the symbol is an external reference |
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117 typedef struct lwasm_symbol_ent_s lwasm_symbol_ent_t; |
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118 struct lwasm_symbol_ent_s |
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119 { |
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120 char *sym; // the symbol |
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121 int context; // the context number of the symbol (-1 for global) |
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122 int value; // the value of the symbol |
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123 int flags; // flags for the symbol |
82 | 124 char *externalname; // for external references that are aliased locally |
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125 sectiontab_t *sect; // the section the symbol exists in; NULL for none |
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126 lwasm_expr_stack_t *expr; // expression for a symbol that is not constant NULL for const |
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127 lwasm_symbol_ent_t *next; // next symbol in the table |
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128 lwasm_symbol_ent_t *prev; // previous symbol in the table |
21 | 129 }; |
0 | 130 |
131 // keep track of current assembler state | |
132 typedef struct { | |
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133 int dpval; // current dp value (setdp) |
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134 int addr; // current address |
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135 int context; // context counter (for local symbols) |
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136 int errorcount; // error count |
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137 int passnum; // which pass are we on? |
21 | 138 int execaddr; // execution address for the program (END ....) |
139 int pragmas; // what pragmas are in effect? | |
140 | |
141 lwasm_line_t *lineshead; // first line of source code | |
142 lwasm_line_t *linestail; // last line of source code | |
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143 |
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144 lwasm_symbol_ent_t *symhead; // first entry in symbol table |
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145 lwasm_symbol_ent_t *symtail; // last entry in symbol table |
57 | 146 |
147 macrotab_t *macros; // macro table | |
21 | 148 |
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149 const char *infile; // input file |
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150 const char *outfile; // output file |
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151 const char *listfile; // output listing file |
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152 int outformat; // output format type |
21 | 153 char **filelist; // files that have been read |
154 int filelistlen; // number of files in the list | |
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155 |
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156 int endseen; // set to true if "end" has been seen |
57 | 157 int skipcond; // skipping a condition? |
158 int skipcount; // how many? | |
159 int skipmacro; // skipping a macro? | |
160 int inmacro; // are we currently in a macro? | |
161 int macroex; // current depth of macro expansion | |
162 int nextcontext; // next context number | |
163 int skiplines; // number of lines to skip | |
74 | 164 |
165 // items used only for the "object" target | |
166 sectiontab_t *sections; // pointer to section table | |
167 sectiontab_t *csect; // current section - NULL if not in one | |
0 | 168 } asmstate_t; |
169 | |
170 #define PRAGMA_NOINDEX0TONONE 1 | |
171 | |
26 | 172 #ifndef __lwasm_c_seen__ |
173 #define __lwasm_E__ extern | |
174 #else | |
175 #define __lwasm_E__ | |
176 #endif | |
177 | |
38 | 178 __lwasm_E__ int debug_level; |
179 | |
26 | 180 __lwasm_E__ int register_error(asmstate_t *as, lwasm_line_t *l, int pass, const char *fmt, ...); |
38 | 181 __lwasm_E__ void debug_message(int level, const char *fmt, ...); |
26 | 182 |
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183 __lwasm_E__ void lwasm_emit(asmstate_t *as, lwasm_line_t *l, int b); |
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184 __lwasm_E__ void lwasm_emitop(asmstate_t *as, lwasm_line_t *l, int o); |
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185 __lwasm_E__ int lwasm_lookupreg2(const char *reglist, char **str); |
32 | 186 __lwasm_E__ int lwasm_lookupreg3(const char *rlist, const char **str); |
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187 |
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188 __lwasm_E__ lwasm_expr_stack_t *lwasm_evaluate_expr(asmstate_t *as, lwasm_line_t *l, const char *inp, const char **outp); |
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189 |
55 | 190 |
57 | 191 // return next context number and update it |
192 __lwasm_E__ int lwasm_next_context(asmstate_t *as); | |
193 | |
55 | 194 // also throw an error on expression eval failure |
76 | 195 // return 0 on ok, -1 on error, 1 if a complex expression was returned |
55 | 196 #define EXPR_NOFLAG 0 |
76 | 197 #define EXPR_PASS1CONST 1 // no forward references on pass 1 |
198 #define EXPR_PASS2CONST 2 // no undefined references on pass 2 | |
199 #define EXPR_BYTE 4 // the result must fit within 8 bits | |
200 #define EXPR_COMPLEX 8 // a non-constant result is permitted (stored in l -> expr) | |
77 | 201 #define EXPR_NOINTERSECT 16 // only allow intra-section values (pass 2) |
76 | 202 |
55 | 203 __lwasm_E__ int lwasm_expr_result(asmstate_t *as, lwasm_line_t *l, char **inp, int flag, int *val); |
77 | 204 __lwasm_E__ int lwasm_expr_result2(asmstate_t *as, lwasm_line_t *l, char **inp, int flag, int *val, int slot); |
55 | 205 |
26 | 206 #undef __lwasm_E__ |
207 | |
208 | |
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209 #ifndef __symbol_c_seen__ |
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210 #define __lwasm_E__ extern |
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211 #else |
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212 #define __lwasm_E__ |
0 | 213 #endif |
214 | |
64 | 215 __lwasm_E__ int lwasm_register_symbol(asmstate_t *as, lwasm_line_t *l, char *sym, int val, int flags); |
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216 __lwasm_E__ lwasm_symbol_ent_t *lwasm_find_symbol(asmstate_t *as, char *sym, int scontext); |
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217 __lwasm_E__ int lwasm_set_symbol(asmstate_t *as, char *sym, int scontext, int val); |
58 | 218 __lwasm_E__ void lwasm_list_symbols(asmstate_t *as, FILE *f); |
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219 #undef __lwasm_E__ |
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220 |
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221 |
0 | 222 |
223 #endif //__lwasm_h_seen__ |