summaryrefslogtreecommitdiff
path: root/src/mesa/slang/slang_compile_function.c
blob: 4dd885176d445d920ecfd02e18a83752c02f48c3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
/*
 * Mesa 3-D graphics library
 * Version:  6.5
 *
 * Copyright (C) 2005-2006  Brian Paul   All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

/**
 * \file slang_compile_function.c
 * slang front-end compiler
 * \author Michal Krol
 */

#include "main/imports.h"
#include "slang_compile.h"
#include "slang_mem.h"


int
slang_function_construct(slang_function * func)
{
   func->kind = SLANG_FUNC_ORDINARY;
   if (!slang_variable_construct(&func->header))
      return 0;

   func->parameters = (slang_variable_scope *)
      _slang_alloc(sizeof(slang_variable_scope));
   if (func->parameters == NULL) {
      slang_variable_destruct(&func->header);
      return 0;
   }

   _slang_variable_scope_ctr(func->parameters);
   func->param_count = 0;
   func->body = NULL;
   return 1;
}

void
slang_function_destruct(slang_function * func)
{
   slang_variable_destruct(&func->header);
   slang_variable_scope_destruct(func->parameters);
   _slang_free(func->parameters);
   if (func->body != NULL) {
      slang_operation_destruct(func->body);
      _slang_free(func->body);
   }
}


slang_function *
slang_function_new(slang_function_kind kind)
{
   slang_function *fun = (slang_function *)
      _slang_alloc(sizeof(slang_function));
   if (fun) {
      slang_function_construct(fun);
      fun->kind = kind;
   }
   return fun;
}


/*
 * slang_function_scope
 */

GLvoid
_slang_function_scope_ctr(slang_function_scope * self)
{
   self->functions = NULL;
   self->num_functions = 0;
   self->outer_scope = NULL;
}

void
slang_function_scope_destruct(slang_function_scope * scope)
{
   unsigned int i;

   for (i = 0; i < scope->num_functions; i++)
      slang_function_destruct(scope->functions + i);
   _slang_free(scope->functions);
}


/**
 * Does this function have a non-void return value?
 */
GLboolean
_slang_function_has_return_value(const slang_function *fun)
{
   return fun->header.type.specifier.type != SLANG_SPEC_VOID;
}


/**
 * Search a list of functions for a particular function by name.
 * \param funcs  the list of functions to search
 * \param a_name  the name to search for
 * \param all_scopes  if non-zero, search containing scopes too.
 * \return pointer to found function, or NULL.
 */
int
slang_function_scope_find_by_name(slang_function_scope * funcs,
                                  slang_atom a_name, int all_scopes)
{
   unsigned int i;

   for (i = 0; i < funcs->num_functions; i++)
      if (a_name == funcs->functions[i].header.a_name)
         return 1;
   if (all_scopes && funcs->outer_scope != NULL)
      return slang_function_scope_find_by_name(funcs->outer_scope, a_name, 1);
   return 0;
}


/**
 * Search a list of functions for a particular function (for implementing
 * function calls.  Matching is done by first comparing the function's name,
 * then the function's parameter list.
 *
 * \param funcs  the list of functions to search
 * \param fun  the function to search for
 * \param all_scopes  if non-zero, search containing scopes too.
 * \return pointer to found function, or NULL.
 */
slang_function *
slang_function_scope_find(slang_function_scope * funcs, slang_function * fun,
                          int all_scopes)
{
   unsigned int i;

   for (i = 0; i < funcs->num_functions; i++) {
      slang_function *f = &funcs->functions[i];
      const GLuint haveRetValue = 0;
#if 0
         = (f->header.type.specifier.type != SLANG_SPEC_VOID);
#endif
      unsigned int j;

      /*
      printf("Compare name %s to %s  (ret %u, %d, %d)\n",
             (char *) fun->header.a_name, (char *) f->header.a_name,
             haveRetValue,
             fun->param_count, f->param_count);
      */

      if (fun->header.a_name != f->header.a_name)
         continue;
      if (fun->param_count != f->param_count)
         continue;
      for (j = haveRetValue; j < fun->param_count; j++) {
         if (!slang_type_specifier_equal
             (&fun->parameters->variables[j]->type.specifier,
              &f->parameters->variables[j]->type.specifier))
            break;
      }
      if (j == fun->param_count) {
         /*
         printf("Found match\n");
         */
         return f;
      }
   }
   /*
   printf("Not found\n");
   */
   if (all_scopes && funcs->outer_scope != NULL)
      return slang_function_scope_find(funcs->outer_scope, fun, 1);
   return NULL;
}


/**
 * Lookup a function according to name and parameter count/types.
 */
slang_function *
_slang_function_locate(const slang_function_scope * funcs, slang_atom a_name,
                       slang_operation * args, GLuint num_args,
                       const slang_name_space * space, slang_atom_pool * atoms,
                       slang_info_log *log, GLboolean *error)
{
   slang_typeinfo arg_ti[100];
   GLuint i;

   *error = GL_FALSE;

   /* determine type of each argument */
   assert(num_args < 100);
   for (i = 0; i < num_args; i++) {
      if (!slang_typeinfo_construct(&arg_ti[i]))
         return NULL;
      if (!_slang_typeof_operation(&args[i], space, &arg_ti[i], atoms, log)) {
         return NULL;
      }
   }

   /* loop over function scopes */
   while (funcs) {

      /* look for function with matching name and argument/param types */
      for (i = 0; i < funcs->num_functions; i++) {
         slang_function *f = &funcs->functions[i];
         const GLuint haveRetValue = _slang_function_has_return_value(f);
         GLuint j;

         if (a_name != f->header.a_name)
            continue;
         if (f->param_count - haveRetValue != num_args)
            continue;

         /* compare parameter / argument types */
         for (j = 0; j < num_args; j++) {
            if (!slang_type_specifier_compatible(&arg_ti[j].spec,
                              &f->parameters->variables[j]->type.specifier)) {
               /* param/arg types don't match */
               break;
            }

            /* "out" and "inout" formal parameter requires the actual
             * argument to be an l-value.
             */
            if (!arg_ti[j].can_be_referenced &&
                (f->parameters->variables[j]->type.qualifier == SLANG_QUAL_OUT ||
                 f->parameters->variables[j]->type.qualifier == SLANG_QUAL_INOUT)) {
               /* param is not an lvalue! */
               *error = GL_TRUE;
               return NULL;
            }
         }

         if (j == num_args) {
            /* name and args match! */
            return f;
         }
      }

      funcs = funcs->outer_scope;
   }

   return NULL;
}