src/glsl/ir_validate.cpp

   1 /*
   2  * Copyright © 2010 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * 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
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * \file ir_validate.cpp
  26  *
  27  * Attempts to verify that various invariants of the IR tree are true.
  28  *
  29  * In particular, at the moment it makes sure that no single
  30  * ir_instruction node except for ir_variable appears multiple times
  31  * in the ir tree.  ir_variable does appear multiple times: Once as a
  32  * declaration in an exec_list, and multiple times as the endpoint of
  33  * a dereference chain.
  34  */
  35
  36 #include <inttypes.h>
  37 #include "ir.h"
  38 #include "ir_hierarchical_visitor.h"
  39 #include "hash_table.h"
  40 #include "glsl_types.h"
  41
  42 class ir_validate : public ir_hierarchical_visitor {
  43 public:
  44    ir_validate()
  45    {
  46       this->ht = hash_table_ctor(0, hash_table_pointer_hash,
  47                                  hash_table_pointer_compare);
  48
  49       this->current_function = NULL;
  50
  51       this->callback = ir_validate::validate_ir;
  52       this->data = ht;
  53    }
  54
  55    ~ir_validate()
  56    {
  57       hash_table_dtor(this->ht);
  58    }
  59
  60    virtual ir_visitor_status visit(ir_variable *v);
  61    virtual ir_visitor_status visit(ir_dereference_variable *ir);
  62    virtual ir_visitor_status visit(ir_if *ir);
  63
  64    virtual ir_visitor_status visit_enter(ir_function *ir);
  65    virtual ir_visitor_status visit_leave(ir_function *ir);
  66    virtual ir_visitor_status visit_enter(ir_function_signature *ir);
  67
  68    static void validate_ir(ir_instruction *ir, void *data);
  69
  70    ir_function *current_function;
  71
  72    struct hash_table *ht;
  73 };
  74
  75
  76 ir_visitor_status
  77 ir_validate::visit(ir_dereference_variable *ir)
  78 {
  79    if ((ir->var == NULL) || (ir->var->as_variable() == NULL)) {
  80       printf("ir_dereference_variable @ %p does not specify a variable %p\n",
  81              ir, ir->var);
  82       abort();
  83    }
  84
  85    if (hash_table_find(ht, ir->var) == NULL) {
  86       printf("ir_dereference_variable @ %p specifies undeclared variable "
  87              "`%s' @ %p\n",
  88              ir, ir->var->name, ir->var);
  89       abort();
  90    }
  91
  92    this->validate_ir(ir, this->data);
  93
  94    return visit_continue;
  95 }
  96
  97 ir_visitor_status
  98 ir_validate::visit(ir_if *ir)
  99 {
 100    if (ir->condition->type != glsl_type::bool_type) {
 101       printf("ir_if condition %s type instead of bool.\n",
 102              ir->condition->type->name);
 103       ir->print();
 104       printf("\n");
 105       abort();
 106    }
 107 }
 108
 109
 110 ir_visitor_status
 111 ir_validate::visit_enter(ir_function *ir)
 112 {
 113    /* Function definitions cannot be nested.
 114     */
 115    if (this->current_function != NULL) {
 116       printf("Function definition nested inside another function "
 117              "definition:\n");
 118       printf("%s %p inside %s %p\n",
 119              ir->name, ir,
 120              this->current_function->name, this->current_function);
 121       abort();
 122    }
 123
 124    /* Store the current function hierarchy being traversed.  This is used
 125     * by the function signature visitor to ensure that the signatures are
 126     * linked with the correct functions.
 127     */
 128    this->current_function = ir;
 129
 130    this->validate_ir(ir, this->data);
 131
 132    return visit_continue;
 133 }
 134
 135 ir_visitor_status
 136 ir_validate::visit_leave(ir_function *ir)
 137 {
 138    (void) ir;
 139
 140    this->current_function = NULL;
 141    return visit_continue;
 142 }
 143
 144 ir_visitor_status
 145 ir_validate::visit_enter(ir_function_signature *ir)
 146 {
 147    if (this->current_function != ir->function()) {
 148       printf("Function signature nested inside wrong function "
 149              "definition:\n");
 150       printf("%p inside %s %p instead of %s %p\n",
 151              ir,
 152              this->current_function->name, this->current_function,
 153              ir->function_name(), ir->function());
 154       abort();
 155    }
 156
 157    this->validate_ir(ir, this->data);
 158
 159    return visit_continue;
 160 }
 161
 162 ir_visitor_status
 163 ir_validate::visit(ir_variable *ir)
 164 {
 165    /* An ir_variable is the one thing that can (and will) appear multiple times
 166     * in an IR tree.  It is added to the hashtable so that it can be used
 167     * in the ir_dereference_variable handler to ensure that a variable is
 168     * declared before it is dereferenced.
 169     */
 170    hash_table_insert(ht, ir, ir);
 171    return visit_continue;
 172 }
 173
 174 void
 175 ir_validate::validate_ir(ir_instruction *ir, void *data)
 176 {
 177    struct hash_table *ht = (struct hash_table *) data;
 178
 179    if (hash_table_find(ht, ir)) {
 180       printf("Instruction node present twice in ir tree:\n");
 181       ir->print();
 182       printf("\n");
 183       abort();
 184    }
 185    hash_table_insert(ht, ir, ir);
 186 }
 187
 188 void
 189 check_node_type(ir_instruction *ir, void *data)
 190 {
 191    if (ir->ir_type <= ir_type_unset || ir->ir_type >= ir_type_max) {
 192       printf("Instruction node with unset type\n");
 193       ir->print(); printf("\n");
 194    }
 195    assert(ir->type != glsl_type::error_type);
 196 }
 197
 198 void
 199 validate_ir_tree(exec_list *instructions)
 200 {
 201    ir_validate v;
 202
 203    v.run(instructions);
 204
 205    foreach_iter(exec_list_iterator, iter, *instructions) {
 206       ir_instruction *ir = (ir_instruction *)iter.get();
 207
 208       visit_tree(ir, check_node_type, NULL);
 209    }
 210 }