assembler.c

   1 /*
   2  * Copyright (C) 2012
   3  *      Dale Weiler
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a copy of
   6  * this software and associated documentation files (the "Software"), to deal in
   7  * the Software without restriction, including without limitation the rights to
   8  * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
   9  * of the Software, and to permit persons to whom the Software is furnished to do
  10  * so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be included in all
  13  * copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  18  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  21  * SOFTWARE.
  22  */
  23 #include "gmqcc.h"
  24 /*
  25  * This is the assembler, gmqas, this is being implemented because I'm
  26  * not exactly sure how codegen would work for the C compiler as of yet
  27  * and also I plan to allow inline assembly for the compiler.
  28  */
  29 static const struct {
  30         const char  *m; /* menomic     */
  31         const size_t o; /* operands    */
  32         const size_t l; /* menomic len */
  33 } const asm_instr[] = {
  34         [INSTR_DONE]       = { "DONE"      , 0, 4 },
  35         [INSTR_MUL_F]      = { "MUL_F"     , 0, 5 },
  36         [INSTR_MUL_V]      = { "MUL_V"     , 0, 5 },
  37         [INSTR_MUL_FV]     = { "MUL_FV"    , 0, 6 },
  38         [INSTR_MUL_VF]     = { "MUL_VF"    , 0, 6 },
  39         [INSTR_DIV_F]      = { "DIV"       , 0, 3 },
  40         [INSTR_ADD_F]      = { "ADD_F"     , 0, 5 },
  41         [INSTR_ADD_V]      = { "ADD_V"     , 0, 5 },
  42         [INSTR_SUB_F]      = { "SUB_F"     , 0, 5 },
  43         [INSTR_SUB_V]      = { "DUB_V"     , 0, 5 },
  44         [INSTR_EQ_F]       = { "EQ_F"      , 0, 4 },
  45         [INSTR_EQ_V]       = { "EQ_V"      , 0, 4 },
  46         [INSTR_EQ_S]       = { "EQ_S"      , 0, 4 },
  47         [INSTR_EQ_E]       = { "EQ_E"      , 0, 4 },
  48         [INSTR_EQ_FNC]     = { "ES_FNC"    , 0, 6 },
  49         [INSTR_NE_F]       = { "NE_F"      , 0, 4 },
  50         [INSTR_NE_V]       = { "NE_V"      , 0, 4 },
  51         [INSTR_NE_S]       = { "NE_S"      , 0, 4 },
  52         [INSTR_NE_E]       = { "NE_E"      , 0, 4 },
  53         [INSTR_NE_FNC]     = { "NE_FNC"    , 0, 6 },
  54         [INSTR_LE]         = { "LE"        , 0, 2 },
  55         [INSTR_GE]         = { "GE"        , 0, 2 },
  56         [INSTR_LT]         = { "LT"        , 0, 2 },
  57         [INSTR_GT]         = { "GT"        , 0, 2 },
  58         [INSTR_LOAD_F]     = { "FIELD_F"   , 0, 7 },
  59         [INSTR_LOAD_V]     = { "FIELD_V"   , 0, 7 },
  60         [INSTR_LOAD_S]     = { "FIELD_S"   , 0, 7 },
  61         [INSTR_LOAD_ENT]   = { "FIELD_ENT" , 0, 9 },
  62         [INSTR_LOAD_FLD]   = { "FIELD_FLD" , 0, 9 },
  63         [INSTR_LOAD_FNC]   = { "FIELD_FNC" , 0, 9 },
  64         [INSTR_ADDRESS]    = { "ADDRESS"   , 0, 7 },
  65         [INSTR_STORE_F]    = { "STORE_F"   , 0, 7 },
  66         [INSTR_STORE_V]    = { "STORE_V"   , 0, 7 },
  67         [INSTR_STORE_S]    = { "STORE_S"   , 0, 7 },
  68         [INSTR_STORE_ENT]  = { "STORE_ENT" , 0, 9 },
  69         [INSTR_STORE_FLD]  = { "STORE_FLD" , 0, 9 },
  70         [INSTR_STORE_FNC]  = { "STORE_FNC" , 0, 9 },
  71         [INSTR_STOREP_F]   = { "STOREP_F"  , 0, 8 },
  72         [INSTR_STOREP_V]   = { "STOREP_V"  , 0, 8 },
  73         [INSTR_STOREP_S]   = { "STOREP_S"  , 0, 8 },
  74         [INSTR_STOREP_ENT] = { "STOREP_ENT", 0, 10},
  75         [INSTR_STOREP_FLD] = { "STOREP_FLD", 0, 10},
  76         [INSTR_STOREP_FNC] = { "STOREP_FNC", 0, 10},
  77         [INSTR_RETURN]     = { "RETURN"    , 0, 6 },
  78         [INSTR_NOT_F]      = { "NOT_F"     , 0, 5 },
  79         [INSTR_NOT_V]      = { "NOT_V"     , 0, 5 },
  80         [INSTR_NOT_S]      = { "NOT_S"     , 0, 5 },
  81         [INSTR_NOT_ENT]    = { "NOT_ENT"   , 0, 7 },
  82         [INSTR_NOT_FNC]    = { "NOT_FNC"   , 0, 7 },
  83         [INSTR_IF]         = { "IF"        , 0, 2 },
  84         [INSTR_IFNOT]      = { "IFNOT"     , 0, 5 },
  85         [INSTR_CALL0]      = { "CALL0"     , 0, 5 },
  86         [INSTR_CALL1]      = { "CALL1"     , 0, 5 },
  87         [INSTR_CALL2]      = { "CALL2"     , 0, 5 },
  88         [INSTR_CALL3]      = { "CALL3"     , 0, 5 },
  89         [INSTR_CALL4]      = { "CALL4"     , 0, 5 },
  90         [INSTR_CALL5]      = { "CALL5"     , 0, 5 },
  91         [INSTR_CALL6]      = { "CALL6"     , 0, 5 },
  92         [INSTR_CALL7]      = { "CALL7"     , 0, 5 },
  93         [INSTR_CALL8]      = { "CALL8"     , 0, 5 },
  94         [INSTR_STATE]      = { "STATE"     , 0, 5 },
  95         [INSTR_GOTO]       = { "GOTO"      , 0, 4 },
  96         [INSTR_AND]        = { "AND"       , 0, 3 },
  97         [INSTR_OR]         = { "OR"        , 0, 2 },
  98         [INSTR_BITAND]     = { "BITAND"    , 0, 6 },
  99         [INSTR_BITOR]      = { "BITOR"     , 0, 5 }
 100 };
 101
 102 /*
 103  * Some assembler keywords not part of the opcodes above: these are
 104  * for creating functions, or constants.
 105  */
 106 const char *const asm_keys[] = {
 107         "FLOAT"    , /* define float  */
 108         "VECTOR"   , /* define vector */
 109         "ENTITY"   , /* define ent    */
 110         "FIELD"    , /* define field  */
 111         "STRING"   , /* define string */
 112         "FUNCTION"
 113 };
 114
 115 static char *const asm_getline(size_t *byte, FILE *fp) {
 116         char   *line = NULL;
 117         ssize_t read = getline(&line, byte, fp);
 118         *byte = read;
 119         if (read == -1) {
 120                 free (line);
 121                 return NULL;
 122         }
 123         return line;
 124 }
 125
 126 #define asm_rmnewline(L,S) *((L)+*(S)-1) = '\0'
 127 #define asm_skipwhite(L)             \
 128     while((*(L)==' '||*(L)=='\t')) { \
 129         (L)++;                       \
 130     }
 131
 132 void asm_init(const char *file, FILE **fp) {
 133         *fp = fopen(file, "r");
 134         code_init();
 135 }
 136
 137 void asm_close(FILE *fp) {
 138         fclose(fp);
 139         code_write();
 140 }
 141
 142 void asm_parse(FILE *fp) {
 143         char  *data = NULL;
 144         char  *skip = NULL;
 145         long   line = 1; /* current line */
 146         size_t size = 0; /* size of line */
 147
 148         while ((data = asm_getline(&size, fp)) != NULL) {
 149                 skip = data;
 150                 asm_skipwhite(skip);
 151                 asm_rmnewline(skip, &size);
 152
 153                 #define DECLTYPE(X, CODE)                                         \
 154                     if (!strncmp(X, skip, strlen(X))) {                           \
 155                         if (skip[strlen(X)] != ':') {                             \
 156                             printf("%li: Missing `:` after decltype\n",line);     \
 157                             exit (1);                                             \
 158                         }                                                         \
 159                         skip += strlen(X)+1;                                      \
 160                         asm_skipwhite(skip);                                      \
 161                         if(!isalpha(*skip)) {                                     \
 162                             printf("%li: Invalid identififer: %s\n", line, skip); \
 163                             exit (1);                                             \
 164                         } else {                                                  \
 165                             size_t offset_code      = code_statements_elements+1; \
 166                             size_t offset_chars     = code_strings_elements   +1; \
 167                             size_t offset_globals   = code_globals_elements   +1; \
 168                             size_t offset_functions = code_functions_elements +1; \
 169                             size_t offset_fields    = code_fields_elements    +1; \
 170                             size_t offset_defs      = code_defs_elements      +1; \
 171                             CODE                                                  \
 172                             /* silent unused warnings */                          \
 173                             (void)offset_code;                                    \
 174                             (void)offset_chars;                                   \
 175                             (void)offset_globals;                                 \
 176                             (void)offset_functions;                               \
 177                             (void)offset_fields;                                  \
 178                             (void)offset_defs;                                    \
 179                         }                                                         \
 180                         goto end;                                                 \
 181                     }
 182
 183                 /* FLOAT    */
 184                 DECLTYPE(asm_keys[0], {
 185                         code_defs_add((prog_section_def){
 186                                 .type   = TYPE_FLOAT,
 187                                 .offset = offset_globals, /* global table */
 188                                 .name   = offset_chars    /* string table TODO */
 189                         });
 190                         float f = 0; /*TODO*/
 191                         code_globals_add(*(int*)&f);
 192
 193                 });
 194                 DECLTYPE(asm_keys[1], {
 195                         code_defs_add((prog_section_def){
 196                                 .type   = TYPE_FLOAT,
 197                                 .offset = offset_globals, /* global table */
 198                                 .name   = offset_chars    /* string table TODO */
 199                         });
 200                         float f1 = 0;
 201                         float f2 = 0;
 202                         float f3 = 0;
 203                         code_globals_add(*(int*)&f1);
 204                         code_globals_add(*(int*)&f2);
 205                         code_globals_add(*(int*)&f3);
 206                 });
 207                 /* ENTITY   */ DECLTYPE(asm_keys[2], {});
 208                 /* FIELD    */ DECLTYPE(asm_keys[3], {});
 209                 /* STRING   */
 210                 DECLTYPE(asm_keys[4], {
 211                         code_defs_add((prog_section_def){
 212                                 .type   = TYPE_STRING,
 213                                 .offset = offset_globals, /* offset to offset in string table (for data)*/
 214                                 .name   = offset_chars    /* location of name in string table (for name)*/
 215                         });
 216                 });
 217                 /* FUNCTION */
 218                 DECLTYPE(asm_keys[5], {
 219                         /* TODO: parse */
 220                         code_defs_add((prog_section_def){
 221                                 .type   = TYPE_VOID,
 222                                 .offset = offset_globals,
 223                                 .name   = offset_chars
 224                         });
 225                         code_globals_add(offset_functions);
 226                         code_functions_add((prog_section_function){
 227                                 .entry      =  offset_code,
 228                                 .firstlocal =  0,
 229                                 .locals     =  0,
 230                                 .profile    =  0,
 231                                 .name       =  offset_chars,
 232                                 .file       =  0,
 233                                 .nargs      =  0,
 234                                 .argsize    = {0}
 235                         });
 236                 });
 237
 238                 /* if we make it this far then we have statements */
 239                 {
 240                         size_t i = 0;
 241                         for (; i < sizeof(asm_instr)/sizeof(*asm_instr); i++) {
 242                                 if (!strncmp(skip, asm_instr[i].m, asm_instr[i].l)) {
 243                                         /* TODO */
 244                                         goto end;
 245                                 }
 246                         }
 247                 }
 248
 249                 /* if we made it this far something is wrong */
 250                 printf("ERROR");
 251
 252                 end:
 253                 free(data);
 254         }
 255 }