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_setfunc(me, fn, what) ( *(void**)&((me)->fn) = what )
  31
  32 #define ast_instantiate(T, ctx, destroyfn)                    \
  33     T *self = (T*)mem_a(sizeof(T));                           \
  34     ast_node_init((ast_node*)self, ctx);                      \
  35     ast_setfunc(&((ast_node*)self)->node, destroy, destroyfn)
  36
  37 /* It must not be possible to get here. */
  38 static void _ast_node_destroy(ast_node *self)
  39 {
  40     fprintf(stderr, "ast node missing destroy()\n");
  41     abort();
  42 }
  43
  44 /* Initialize main ast node aprts */
  45 static void ast_node_init(ast_node *self, lex_ctx_t ctx)
  46 {
  47     self->node.context = ctx;
  48     self->node.destroy = &_ast_node_destroy;
  49     self->node.keep    = false;
  50 }
  51
  52 /* General expression initialization */
  53 static void ast_expression_init(ast_expression *self,
  54                                 ast_expression_codegen *codegen)
  55 {
  56     ast_setfunc(&self->expression, codegen, codegen);
  57 }
  58
  59 ast_value* ast_value_new(lex_ctx_t ctx, const char *name, int t, bool keep)
  60 {
  61     ast_instantiate(ast_value, ctx, ast_value_delete);
  62     ast_expression_init((ast_expression*)self,
  63                         (ast_expression_codegen*)&ast_value_codegen);
  64     self->expression.node.keep = keep;
  65
  66     self->name = name ? util_strdup(name) : NULL;
  67     self->vtype = t;
  68     self->next = NULL;
  69     MEM_VECTOR_INIT(self, params);
  70     self->isconst = false;
  71     memset(&self->constval, 0, sizeof(self->constval));
  72
  73     self->ir_v = NULL;
  74
  75     return self;
  76 }
  77 MEM_VEC_FUNCTIONS(ast_value, ast_value*, params)
  78
  79 void ast_value_delete(ast_value* self)
  80 {
  81     size_t i;
  82     if (self->name)
  83         mem_d((void*)self->name);
  84     for (i = 0; i < self->params_count; ++i)
  85         ast_unref(self->params[i]);
  86     MEM_VECTOR_CLEAR(self, params);
  87     if (self->next) /* delete, not unref, types are always copied */
  88         ast_delete(self->next);
  89     if (self->isconst) {
  90         switch (self->vtype)
  91         {
  92         case qc_string:
  93             mem_d((void*)self->constval.vstring);
  94             break;
  95         /* NOTE: delete function? currently collected in
  96          * the parser structure
  97          */
  98         default:
  99             break;
 100         }
 101     }
 102     mem_d(self);
 103 }
 104
 105 void ast_value_set_name(ast_value *self, const char *name)
 106 {
 107     if (self->name)
 108         mem_d((void*)self->name);
 109     self->name = util_strdup(name);
 110 }
 111
 112 ast_binary* ast_binary_new(lex_ctx_t ctx, int op,
 113                            ast_value* left, ast_value* right)
 114 {
 115     ast_instantiate(ast_binary, ctx, ast_binary_delete);
 116     ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_binary_codegen);
 117
 118     self->op = op;
 119     self->left = left;
 120     self->right = right;
 121
 122     return self;
 123 }
 124
 125 void ast_binary_delete(ast_binary *self)
 126 {
 127     ast_unref(self->left);
 128     ast_unref(self->right);
 129     mem_d(self);
 130 }
 131
 132 ast_store* ast_store_new(lex_ctx_t ctx, int op,
 133                          ast_value *dest, ast_value *source)
 134 {
 135     ast_instantiate(ast_store, ctx, ast_store_delete);
 136     ast_expression_init((ast_expression*)self, (ast_expression_codegen*)&ast_store_codegen);
 137
 138     self->op = op;
 139     self->dest = dest;
 140     self->source = source;
 141
 142     return self;
 143 }
 144
 145 void ast_store_delete(ast_store *self)
 146 {
 147     ast_unref(self->dest);
 148     ast_unref(self->source);
 149     mem_d(self);
 150 }
 151
 152 ast_block* ast_block_new(lex_ctx_t ctx)
 153 {
 154     ast_instantiate(ast_block, ctx, ast_block_delete);
 155     ast_expression_init((ast_expression*)self,
 156                         (ast_expression_codegen*)&ast_block_codegen);
 157
 158     MEM_VECTOR_INIT(self, locals);
 159     MEM_VECTOR_INIT(self, exprs);
 160
 161     return self;
 162 }
 163 MEM_VEC_FUNCTIONS(ast_block, ast_value*, locals)
 164 MEM_VEC_FUNCTIONS(ast_block, ast_expression*, exprs)
 165
 166 void ast_block_delete(ast_block *self)
 167 {
 168     size_t i;
 169     for (i = 0; i < self->locals_count; ++i)
 170         ast_delete(self->locals[i]);
 171     MEM_VECTOR_CLEAR(self, locals);
 172     for (i = 0; i < self->exprs_count; ++i)
 173         ast_unref(self->exprs[i]);
 174     MEM_VECTOR_CLEAR(self, exprs);
 175     mem_d(self);
 176 }
 177
 178 ast_function* ast_function_new(lex_ctx_t ctx, const char *name, ast_value *vtype)
 179 {
 180     ast_instantiate(ast_function, ctx, ast_function_delete);
 181
 182     self->vtype = vtype;
 183     self->name = name ? util_strdup(name) : NULL;
 184     MEM_VECTOR_INIT(self, blocks);
 185
 186     return self;
 187 }
 188
 189 MEM_VEC_FUNCTIONS(ast_function, ast_block*, blocks)
 190
 191 void ast_function_delete(ast_function *self)
 192 {
 193     size_t i;
 194     if (self->name)
 195         mem_d((void*)self->name);
 196     if (self->vtype)
 197         ast_value_delete(self->vtype);
 198     for (i = 0; i < self->blocks_count; ++i)
 199         ast_delete(self->blocks[i]);
 200     MEM_VECTOR_CLEAR(self, blocks);
 201     mem_d(self);
 202 }
 203
 204 /*********************************************************************/
 205 /* AST codegen aprt
 206  */
 207
 208 /* Some dummies so it compiles... */
 209 bool ast_value_codegen(ast_value *self, ast_function *func, ir_value **out)
 210 {
 211     return false;
 212 }
 213
 214 bool ast_block_codegen(ast_block *self, ast_function *func, ir_value **out)
 215 {
 216     return false;
 217 }
 218
 219 bool ast_store_codegen(ast_store *self, ast_function *func, ir_value **out)
 220 {
 221     return false;
 222 }
 223
 224 bool ast_binary_codegen(ast_binary *self, ast_function *func, ir_value **out)
 225 {
 226     return false;
 227 }