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 #ifndef GLSL_IR_ARRAY_REFCOUNT_H 31 #define GLSL_IR_ARRAY_REFCOUNT_H 32 33 #include "ir.h" 34 #include "ir_visitor.h" 35 #include "linker_util.h" 36 #include "compiler/glsl_types.h" 37 #include "util/bitset.h" 38 39 class ir_array_refcount_entry 40 { 41 public: 42 ir_array_refcount_entry(ir_variable *var); 43 ir_array_refcount_entry(const ir_array_refcount_entry &) = delete; 44 ~ir_array_refcount_entry(); 45 ir_array_refcount_entry & operator=(const ir_array_refcount_entry &) = delete; 46 47 ir_variable *var; /* The key: the variable's pointer. */ 48 49 /** Has the variable been referenced? */ 50 bool is_referenced; 51 52 /** Count of nested arrays in the type. */ 53 unsigned array_depth; 54 55 /** Set of bit-flags to note which array elements have been accessed. */ 56 BITSET_WORD *bits; 57 58 /** Has a linearized array index been referenced? */ is_linearized_index_referenced(unsigned linearized_index)59 bool is_linearized_index_referenced(unsigned linearized_index) const 60 { 61 assert(bits != 0); 62 assert(linearized_index <= num_bits); 63 64 return BITSET_TEST(bits, linearized_index); 65 } 66 67 private: 68 69 /** 70 * Total number of bits referenced by \c bits. 71 * 72 * Also the total number of array(s-of-arrays) elements of \c var. 73 */ 74 unsigned num_bits; 75 76 friend class array_refcount_test; 77 }; 78 79 class ir_array_refcount_visitor : public ir_hierarchical_visitor { 80 public: 81 ir_array_refcount_visitor(void); 82 ~ir_array_refcount_visitor(void); 83 84 virtual ir_visitor_status visit(ir_dereference_variable *); 85 86 virtual ir_visitor_status visit_enter(ir_function_signature *); 87 virtual ir_visitor_status visit_enter(ir_dereference_array *); 88 89 /** 90 * Find variable in the hash table, and insert it if not present 91 */ 92 ir_array_refcount_entry *get_variable_entry(ir_variable *var); 93 94 /** 95 * Hash table mapping ir_variable to ir_array_refcount_entry. 96 */ 97 struct hash_table *ht; 98 99 void *mem_ctx; 100 101 private: 102 /** Get an array_deref_range element from private tracking. */ 103 array_deref_range *get_array_deref(); 104 105 /** 106 * Last ir_dereference_array that was visited 107 * 108 * Used to prevent some redundant calculations. 109 * 110 * \sa ::visit_enter(ir_dereference_array *) 111 */ 112 ir_dereference_array *last_array_deref; 113 114 /** 115 * \name array_deref_range tracking 116 */ 117 /*@{*/ 118 /** Currently allocated block of derefs. */ 119 array_deref_range *derefs; 120 121 /** Number of derefs used in current processing. */ 122 unsigned num_derefs; 123 124 /** Size of the derefs buffer in bytes. */ 125 unsigned derefs_size; 126 /*@}*/ 127 }; 128 129 #endif /* GLSL_IR_ARRAY_REFCOUNT_H */ 130