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
