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