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annotate src/lwasm.h @ 109:f21a5593a661

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Updated docs
author lost
date Wed, 28 Jan 2009 05:38:21 +0000
parents f59c0916753d
children 0ee5f65bccf9
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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 */
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24 #ifndef __lwasm_h_seen__
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25 #define __lwasm_h_seen__
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26
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27 #include <stdio.h>
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28 #include "expr.h"
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29
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30 #define OUTPUT_DECB 0 // DECB multirecord format
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31 #define OUTPUT_RAW 1 // raw sequence of bytes
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32 #define OUTPUT_OBJ 2 // proprietary object file format
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33 #define OUTPUT_RAWREL 3 // raw bytes where ORG causes a SEEK in the file
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34
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35 // structure for tracking sections
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36 typedef struct section_reloc_list_s section_reloc_list_t;
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37 struct section_reloc_list_s
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38 {
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39 int offset; // offset into section
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40 lwasm_expr_stack_t *expr; // value definition
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41 int context; // symbol context (for local syms)
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42 section_reloc_list_t *next; // next relocation
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43 };
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44
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45 typedef struct export_list_s export_list_t;
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46 struct export_list_s
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47 {
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48 int offset; // offset of symbol
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49 char *sym; // name of symbol
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50 export_list_t *next; // next export
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51 };
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52
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53 #define SECTION_BSS 1 // the section contains no actual code - just uninit vars
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54 typedef struct sectiontab_s sectiontab_t;
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55 struct sectiontab_s
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56 {
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57 char *name; // name of the section
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58 int offset; // current offset in the section
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59 int flags; // section flags
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60 sectiontab_t *next; // next section
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61 // the following are used during code output
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62 unsigned char *obytes; // output bytes
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63 int oblen; // how many bytes output so far?
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64 int obsize; // how big is output buffer so far?
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65 section_reloc_list_t *rl; // relocation list
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66 export_list_t *exports; // export list for the section
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67 };
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68
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69 // structure for tracking macros
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70 typedef struct macrotab_s macrotab_t;
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71 struct macrotab_s
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72 {
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73 char *name;
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74 char **lines;
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75 int numlines;
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76 macrotab_t *next;
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77 };
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78
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79 // structure for tracking errors
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80 typedef struct lwasm_error_s lwasm_error_t;
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81 struct lwasm_error_s
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82 {
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83 char *mess; // the actual error message
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84 lwasm_error_t *next; // ptr to next error
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85 };
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86
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87 // structure for keeping track of lines
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88 // it also as space for 4 expressions which is enough for all known
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89 // instructions and addressing modes
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90 // on pass 1, the expressions are parsed, on pass 2 they are re-evaluated
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91 // to determine constancy
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92 typedef struct lwasm_line_s lwasm_line_t;
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93 struct lwasm_line_s {
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94 char *text; // the actual text of the line
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95 int lineno; // line number within the file
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96 char *filename; // file name reference
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97 lwasm_line_t *next; // next line
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98 lwasm_line_t *prev; // previous line
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99 lwasm_error_t *err; // error messages
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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
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102 unsigned char *bytes; // actual bytes emitted
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103 int codelen; // number of bytes emitted
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104 int codesize; // the size of the code buffer
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105 int codeaddr; // address the code goes at
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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
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109 int badop; // bad operation - ignore it
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110 int context; // the symbol context for this line
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111
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112 // the following are used for obj format - for external references, inter-section
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113 // references, and intrasection relocations
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114 int relocoff; // offset into insn where relocation value goes
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115 lwasm_expr_stack_t *exprs[4]; // non-constant expression values
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116 int exprvals[4]; // constant expression values
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117 char *exprends[4]; // pointer to character after end of expression
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118
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119 sectiontab_t *sect; // which section is the line in?
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120 };
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121
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122 // for keeping track of symbols
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123 #define SYMBOL_SET 1 // the symbol was used for "SET"
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124 #define SYMBOL_COMPLEX 2 // register symbol as a complex symbol (from l -> expr)
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125 #define SYMBOL_FORCE 4 // force resetting the symbol value if it already exists on pass 2
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126 #define SYMBOL_NORM 0 // no flags
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127 #define SYMBOL_EXTERN 8 // the symbol is an external reference
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128 typedef struct lwasm_symbol_ent_s lwasm_symbol_ent_t;
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129 struct lwasm_symbol_ent_s
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130 {
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131 char *sym; // the symbol
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132 int context; // the context number of the symbol (-1 for global)
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133 int value; // the value of the symbol
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134 int flags; // flags for the symbol
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135 char *externalname; // for external references that are aliased locally
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136 sectiontab_t *sect; // the section the symbol exists in; NULL for none
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137 lwasm_expr_stack_t *expr; // expression for a symbol that is not constant NULL for const
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138 lwasm_symbol_ent_t *next; // next symbol in the table
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139 lwasm_symbol_ent_t *prev; // previous symbol in the table
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140 };
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141
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142 // keep track of current assembler state
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143 typedef struct {
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144 int dpval; // current dp value (setdp)
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145 int addr; // current address
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146 int context; // context counter (for local symbols)
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147 int errorcount; // error count
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148 int passnum; // which pass are we on?
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149 int execaddr; // execution address for the program (END ....)
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150 int pragmas; // what pragmas are in effect?
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151
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152 lwasm_line_t *lineshead; // first line of source code
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153 lwasm_line_t *linestail; // last line of source code
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154
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155 lwasm_symbol_ent_t *symhead; // first entry in symbol table
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156 lwasm_symbol_ent_t *symtail; // last entry in symbol table
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157
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158 macrotab_t *macros; // macro table
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159
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160 const char *infile; // input file
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161 const char *outfile; // output file
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162 const char *listfile; // output listing file
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163 int outformat; // output format type
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164 char **filelist; // files that have been read
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165 int filelistlen; // number of files in the list
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166
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167 int endseen; // set to true if "end" has been seen
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168 int skipcond; // skipping a condition?
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169 int skipcount; // how many?
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170 int skipmacro; // skipping a macro?
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171 int inmacro; // are we currently in a macro?
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172 int macroex; // current depth of macro expansion
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173 int nextcontext; // next context number
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174 int skiplines; // number of lines to skip
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175
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176 // items used only for the "object" target
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177 sectiontab_t *sections; // pointer to section table
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178 sectiontab_t *csect; // current section - NULL if not in one
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179 } asmstate_t;
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180
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181 #define PRAGMA_NOINDEX0TONONE 1
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182
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183 #ifndef __lwasm_c_seen__
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184 #define __lwasm_E__ extern
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185 #else
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186 #define __lwasm_E__
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187 #endif
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188
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189 __lwasm_E__ int debug_level;
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190
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191 __lwasm_E__ int register_error(asmstate_t *as, lwasm_line_t *l, int pass, const char *fmt, ...);
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192 __lwasm_E__ void debug_message(int level, const char *fmt, ...);
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193
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194 __lwasm_E__ void lwasm_emit(asmstate_t *as, lwasm_line_t *l, int b);
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195 __lwasm_E__ void lwasm_emitop(asmstate_t *as, lwasm_line_t *l, int o);
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196 __lwasm_E__ int lwasm_lookupreg2(const char *reglist, char **str);
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197 __lwasm_E__ int lwasm_lookupreg3(const char *rlist, const char **str);
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198
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199 __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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200
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201
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202 // return next context number and update it
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203 __lwasm_E__ int lwasm_next_context(asmstate_t *as);
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204
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205 // also throw an error on expression eval failure
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206 // return 0 on ok, -1 on error, 1 if a complex expression was returned
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207 #define EXPR_NOFLAG 0
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208 #define EXPR_PASS1CONST 1 // no forward references on pass 1
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209 #define EXPR_SECTCONST 2 // resolve symbols local to section
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210 #define EXPR_REEVAL 4 // re-evaluate the expression
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211 __lwasm_E__ int lwasm_expr_result(asmstate_t *as, lwasm_line_t *l, char **inp, int flag, int *val);
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212 __lwasm_E__ int lwasm_expr_result2(asmstate_t *as, lwasm_line_t *l, char **inp, int flag, int *val, int slot);
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213
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214 #undef __lwasm_E__
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215
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216
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217 #ifndef __symbol_c_seen__
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218 #define __lwasm_E__ extern
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219 #else
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220 #define __lwasm_E__
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221 #endif
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222
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223 __lwasm_E__ int lwasm_register_symbol(asmstate_t *as, lwasm_line_t *l, char *sym, int val, int flags);
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224 __lwasm_E__ lwasm_symbol_ent_t *lwasm_find_symbol(asmstate_t *as, char *sym, int scontext);
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225 __lwasm_E__ int lwasm_set_symbol(asmstate_t *as, char *sym, int scontext, int val);
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226 __lwasm_E__ void lwasm_list_symbols(asmstate_t *as, FILE *f);
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227 #undef __lwasm_E__
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228
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229
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230
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231 #endif //__lwasm_h_seen__