ast.c

   1 /*
   2  * Copyright (C) 2012
   3  *     Wolfgang Bumiller
   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 <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26
  27 #include "gmqcc.h"
  28 #include "ast.h"
  29
  30 #define ast_instantiate(T, ctx, destroyfn)                          \
  31     T* self = (T*)mem_a(sizeof(T));                                 \
  32     if (!self) {                                                    \
  33         return NULL;                                                \
  34     }                                                               \
  35     ast_node_init((ast_node*)self, ctx);                            \
  36     ( (ast_node*)self )->node.destroy = (ast_node_delete*)destroyfn
  37
  38 /* It must not be possible to get here. */
  39 static void _ast_node_destroy(ast_node *self)
  40 {
  41     fprintf(stderr, "ast node missing destroy()\n");
  42     abort();
  43 }
  44
  45 /* Initialize main ast node aprts */
  46 static void ast_node_init(ast_node *self, lex_ctx ctx)
  47 {
  48     self->node.context = ctx;
  49     self->node.destroy = &_ast_node_destroy;
  50     self->node.keep    = false;
  51 }
  52
  53 /* General expression initialization */
  54 static void ast_expression_init(ast_expression *self,
  55                                 ast_expression_codegen *codegen)
  56 {
  57     self->expression.codegen = codegen;
  58 }
  59
  60 ast_value* ast_value_new(lex_ctx ctx, const char *name, int t)
  61 {
  62     ast_instantiate(ast_value, ctx, ast_value_delete);
  63     ast_expression_init((ast_expression*)self,
  64                         (ast_expression_codegen*)&ast_value_codegen);
  65     self->expression.node.keep = true; /* keep */
  66
  67     self->name = name ? util_strdup(name) : NULL;
  68     self->vtype = t;
  69     self->next = NULL;
  70     MEM_VECTOR_INIT(self, params);
  71     self->isconst = false;
  72     memset(&self->constval, 0, sizeof(self->constval));
  73
  74     self->ir_v    = NULL;
  75
  76     return self;
  77 }
  78 MEM_VEC_FUNCTIONS(ast_value, ast_value*, params)
  79
  80 void ast_value_delete(ast_value* self)
  81 {
  82     size_t i;
  83     if (self->name)
  84         mem_d((void*)self->name);
  85     for (i = 0; i < self->params_count; ++i)
  86         ast_value_delete(self->params[i]); /* delete, the ast_function is expected to die first */
  87     MEM_VECTOR_CLEAR(self, params);
  88     if (self->next) /* delete, not unref, types are always copied */
  89         ast_delete(self->next);
  90     if (self->isconst) {
  91         switch (self->vtype)
  92         {
  93         case TYPE_STRING:
  94             mem_d((void*)self->constval.vstring);
  95             break;
  96         case TYPE_FUNCTION:
  97             /* unlink us from the function node */
  98             self->constval.vfunc->vtype = NULL;
  99             break;
 100         /* NOTE: delete function? currently collected in
 101          * the parser structure
 102          */
 103         default:
 104             break;
 105         }
 106     }
 107     mem_d(self);
 108 }
 109
 110 bool ast_value_set_name(ast_value *self, const char *name)
 111 {
 112     if (self->name)
 113         mem_d((void*)self->name);
 114     self->name = util_strdup(name);
 115     return !!self->name;
 116 }
 117
 118 ast_binary* ast_binary_new(lex_ctx ctx, int op,
 119                            ast_expression* left, ast_expression* right)
 120 {
 121     ast_instantiate(ast_binary, ctx, ast_binary_delete);
 122     ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_binary_codegen);
 123
 124     self->op = op;
 125     self->left = left;
 126     self->right = right;
 127
 128     return self;
 129 }
 130
 131 void ast_binary_delete(ast_binary *self)
 132 {
 133     ast_unref(self->left);
 134     ast_unref(self->right);
 135     mem_d(self);
 136 }
 137
 138 ast_entfield* ast_entfield_new(lex_ctx ctx, ast_expression *entity, ast_expression *field)
 139 {
 140     ast_instantiate(ast_entfield, ctx, ast_entfield_delete);
 141     ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_entfield_codegen);
 142
 143     self->entity = entity;
 144     self->field  = field;
 145
 146     return self;
 147 }
 148
 149 void ast_entfield_delete(ast_entfield *self)
 150 {
 151     ast_unref(self->entity);
 152     ast_unref(self->field);
 153     mem_d(self);
 154 }
 155
 156 ast_store* ast_store_new(lex_ctx ctx, int op,
 157                          ast_value *dest, ast_expression *source)
 158 {
 159     ast_instantiate(ast_store, ctx, ast_store_delete);
 160     ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_store_codegen);
 161
 162     self->op = op;
 163     self->dest = dest;
 164     self->source = source;
 165
 166     return self;
 167 }
 168
 169 void ast_store_delete(ast_store *self)
 170 {
 171     ast_unref(self->dest);
 172     ast_unref(self->source);
 173     mem_d(self);
 174 }
 175
 176 ast_block* ast_block_new(lex_ctx ctx)
 177 {
 178     ast_instantiate(ast_block, ctx, ast_block_delete);
 179     ast_expression_init((ast_expression*)self,
 180                         (ast_expression_codegen*)&ast_block_codegen);
 181
 182     MEM_VECTOR_INIT(self, locals);
 183     MEM_VECTOR_INIT(self, exprs);
 184
 185     return self;
 186 }
 187 MEM_VEC_FUNCTIONS(ast_block, ast_value*, locals)
 188 MEM_VEC_FUNCTIONS(ast_block, ast_expression*, exprs)
 189
 190 void ast_block_delete(ast_block *self)
 191 {
 192     size_t i;
 193     for (i = 0; i < self->exprs_count; ++i)
 194         ast_unref(self->exprs[i]);
 195     MEM_VECTOR_CLEAR(self, exprs);
 196     for (i = 0; i < self->locals_count; ++i)
 197         ast_delete(self->locals[i]);
 198     MEM_VECTOR_CLEAR(self, locals);
 199     mem_d(self);
 200 }
 201
 202 ast_function* ast_function_new(lex_ctx ctx, const char *name, ast_value *vtype)
 203 {
 204     ast_instantiate(ast_function, ctx, ast_function_delete);
 205
 206     if (!vtype ||
 207         vtype->isconst ||
 208         vtype->vtype != TYPE_FUNCTION)
 209     {
 210         mem_d(self);
 211         return NULL;
 212     }
 213
 214     self->vtype = vtype;
 215     self->name = name ? util_strdup(name) : NULL;
 216     MEM_VECTOR_INIT(self, blocks);
 217
 218     self->ir_func = NULL;
 219
 220     vtype->isconst = true;
 221     vtype->constval.vfunc = self;
 222
 223     return self;
 224 }
 225
 226 MEM_VEC_FUNCTIONS(ast_function, ast_block*, blocks)
 227
 228 void ast_function_delete(ast_function *self)
 229 {
 230     size_t i;
 231     if (self->name)
 232         mem_d((void*)self->name);
 233     if (self->vtype) {
 234         /* ast_value_delete(self->vtype); */
 235         self->vtype->isconst = false;
 236         self->vtype->constval.vfunc = NULL;
 237         /* We use unref - if it was stored in a global table it is supposed
 238          * to be deleted from *there*
 239          */
 240         ast_unref(self->vtype);
 241     }
 242     for (i = 0; i < self->blocks_count; ++i)
 243         ast_delete(self->blocks[i]);
 244     MEM_VECTOR_CLEAR(self, blocks);
 245     mem_d(self);
 246 }
 247
 248 /*********************************************************************/
 249 /* AST codegen aprt
 250  */
 251
 252 bool ast_value_codegen(ast_value *self, ast_function *func, bool lvalue, ir_value **out)
 253 {
 254     /* NOTE: This is the codegen for a variable used in an expression.
 255      * It is not the codegen to generate the value. For this purpose,
 256      * ast_local_codegen and ast_global_codegen are to be used before this
 257      * is executed. ast_function_codegen should take care of its locals,
 258      * and the ast-user should take care of ast_global_codegen to be used
 259      * on all the globals.
 260      */
 261     return false;
 262 }
 263
 264 bool ast_global_codegen(ast_value *self, ir_builder *ir)
 265 {
 266     ir_value *v = NULL;
 267     if (self->isconst && self->vtype == TYPE_FUNCTION)
 268     {
 269         ir_function *func = ir_builder_create_function(ir, self->name);
 270         if (!func)
 271             return false;
 272
 273         self->constval.vfunc->ir_func = func;
 274         /* The function is filled later on ast_function_codegen... */
 275         return true;
 276     }
 277
 278     v = ir_builder_create_global(ir, self->name, self->vtype);
 279     if (!v)
 280         return false;
 281
 282     if (self->isconst) {
 283         switch (self->vtype)
 284         {
 285             case TYPE_FLOAT:
 286                 if (!ir_value_set_float(v, self->constval.vfloat))
 287                     goto error;
 288                 break;
 289             case TYPE_VECTOR:
 290                 if (!ir_value_set_vector(v, self->constval.vvec))
 291                     goto error;
 292                 break;
 293             case TYPE_STRING:
 294                 if (!ir_value_set_string(v, self->constval.vstring))
 295                     goto error;
 296                 break;
 297             case TYPE_FUNCTION:
 298                 /* Cannot generate an IR value for a function,
 299                  * need a pointer pointing to a function rather.
 300                  */
 301                 goto error;
 302             default:
 303                 printf("TODO: global constant type %i\n", self->vtype);
 304                 break;
 305         }
 306     }
 307
 308     /* link us to the ir_value */
 309     self->ir_v = v;
 310     return true;
 311
 312 error: /* clean up */
 313     ir_value_delete(v);
 314     return false;
 315 }
 316
 317 bool ast_function_codegen(ast_function *self, ir_builder *ir)
 318 {
 319     if (!self->ir_func) {
 320         printf("ast_function's related ast_value was not generated yet\n");
 321         return false;
 322     }
 323     return false;
 324 }
 325
 326 bool ast_block_codegen(ast_block *self, ast_function *func, bool lvalue, ir_value **out)
 327 {
 328     return false;
 329 }
 330
 331 bool ast_store_codegen(ast_store *self, ast_function *func, bool lvalue, ir_value **out)
 332 {
 333     return false;
 334 }
 335
 336 bool ast_binary_codegen(ast_binary *self, ast_function *func, bool lvalue, ir_value **out)
 337 {
 338     return false;
 339 }
 340
 341 bool ast_entfield_codegen(ast_entfield *self, ast_function *func, bool lvalue, ir_value **out)
 342 {
 343     return false;
 344 }