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