src/compiler/glsl/ir_array_refcount.h

   1 /*
   2  * Copyright © 2016 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_array_refcount.h
  26  *
  27  * Provides a visitor which produces a list of variables referenced.
  28  */
  29
  30 #include "ir.h"
  31 #include "ir_visitor.h"
  32 #include "compiler/glsl_types.h"
  33
  34 class ir_array_refcount_entry
  35 {
  36 public:
  37    ir_array_refcount_entry(ir_variable *var);
  38
  39    ir_variable *var; /* The key: the variable's pointer. */
  40
  41    /** Has the variable been referenced? */
  42    bool is_referenced;
  43 };
  44
  45 class ir_array_refcount_visitor : public ir_hierarchical_visitor {
  46 public:
  47    ir_array_refcount_visitor(void);
  48    ~ir_array_refcount_visitor(void);
  49
  50    virtual ir_visitor_status visit(ir_dereference_variable *);
  51
  52    virtual ir_visitor_status visit_enter(ir_function_signature *);
  53
  54    /**
  55     * Find variable in the hash table, and insert it if not present
  56     */
  57    ir_array_refcount_entry *get_variable_entry(ir_variable *var);
  58
  59    /**
  60     * Hash table mapping ir_variable to ir_array_refcount_entry.
  61     */
  62    struct hash_table *ht;
  63
  64    void *mem_ctx;
  65 };