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
  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->callback = ir_validate::validate_ir;
  50       this->data = ht;
  51    }
  52
  53    ~ir_validate()
  54    {
  55       hash_table_dtor(this->ht);
  56    }
  57
  58    virtual ir_visitor_status visit(ir_variable *v);
  59
  60    static void validate_ir(ir_instruction *ir, void *data);
  61
  62    struct hash_table *ht;
  63 };
  64
  65 ir_visitor_status
  66 ir_validate::visit(ir_variable *ir)
  67 {
  68    /* An ir_variable is the one thing that can (and will) appear multiple times
  69     * in an IR tree.
  70     */
  71    (void) ir;
  72    return visit_continue;
  73 }
  74
  75 void
  76 ir_validate::validate_ir(ir_instruction *ir, void *data)
  77 {
  78    struct hash_table *ht = (struct hash_table *) data;
  79
  80    if (hash_table_find(ht, ir)) {
  81       printf("Instruction node present twice in ir tree:\n");
  82       ir->print();
  83       printf("\n");
  84       abort();
  85    }
  86    hash_table_insert(ht, ir, ir);
  87 }
  88
  89 void
  90 validate_ir_tree(exec_list *instructions)
  91 {
  92    ir_validate v;
  93
  94    v.run(instructions);
  95 }