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      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_variable_refcount.h
     26  *
     27  * Provides a visitor which produces a list of variables referenced,
     28  * how many times they were referenced and assigned, and whether they
     29  * were defined in the scope.
     30  */
     31 
     32 #include "ir.h"
     33 #include "ir_visitor.h"
     34 #include "glsl_types.h"
     35 
     36 class variable_entry : public exec_node
     37 {
     38 public:
     39    variable_entry(ir_variable *var);
     40 
     41    ir_variable *var; /* The key: the variable's pointer. */
     42    ir_assignment *assign; /* An assignment to the variable, if any */
     43 
     44    /** Number of times the variable is referenced, including assignments. */
     45    unsigned referenced_count;
     46 
     47    /** Number of times the variable is assigned. */
     48    unsigned assigned_count;
     49 
     50    bool declaration; /* If the variable had a decl in the instruction stream */
     51 };
     52 
     53 class ir_variable_refcount_visitor : public ir_hierarchical_visitor {
     54 public:
     55    ir_variable_refcount_visitor(void)
     56    {
     57       this->mem_ctx = hieralloc_new(NULL);
     58       this->variable_list.make_empty();
     59    }
     60 
     61    ~ir_variable_refcount_visitor(void)
     62    {
     63       hieralloc_free(this->mem_ctx);
     64    }
     65 
     66    virtual ir_visitor_status visit(ir_variable *);
     67    virtual ir_visitor_status visit(ir_dereference_variable *);
     68 
     69    virtual ir_visitor_status visit_enter(ir_function_signature *);
     70    virtual ir_visitor_status visit_leave(ir_assignment *);
     71 
     72    variable_entry *get_variable_entry(ir_variable *var);
     73 
     74    /* List of variable_entry */
     75    exec_list variable_list;
     76 
     77    void *mem_ctx;
     78 };
     79