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 #ifndef GLSL_IR_VARIABLE_REFCOUNT_H 33 #define GLSL_IR_VARIABLE_REFCOUNT_H 34 35 #include "ir.h" 36 #include "ir_visitor.h" 37 #include "compiler/glsl_types.h" 38 39 struct assignment_entry { 40 exec_node link; 41 ir_assignment *assign; 42 }; 43 44 class ir_variable_refcount_entry 45 { 46 public: 47 ir_variable_refcount_entry(ir_variable *var); 48 49 ir_variable *var; /* The key: the variable's pointer. */ 50 51 /** 52 * List of assignments to the variable, if any. 53 * This is intended to be used for dead code optimisation and may 54 * not be a complete list. 55 */ 56 exec_list assign_list; 57 58 /** Number of times the variable is referenced, including assignments. */ 59 unsigned referenced_count; 60 61 /** Number of times the variable is assigned. */ 62 unsigned assigned_count; 63 64 bool declaration; /* If the variable had a decl in the instruction stream */ 65 }; 66 67 class ir_variable_refcount_visitor : public ir_hierarchical_visitor { 68 public: 69 ir_variable_refcount_visitor(void); 70 ~ir_variable_refcount_visitor(void); 71 72 virtual ir_visitor_status visit(ir_variable *); 73 virtual ir_visitor_status visit(ir_dereference_variable *); 74 75 virtual ir_visitor_status visit_enter(ir_function_signature *); 76 virtual ir_visitor_status visit_leave(ir_assignment *); 77 78 /** 79 * Find variable in the hash table, and insert it if not present 80 */ 81 ir_variable_refcount_entry *get_variable_entry(ir_variable *var); 82 83 /** 84 * Hash table mapping ir_variable to ir_variable_refcount_entry. 85 */ 86 struct hash_table *ht; 87 88 void *mem_ctx; 89 }; 90 91 #endif /* GLSL_IR_VARIABLE_REFCOUNT_H */ 92