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| 5564 | serge | 1 | /* |
| 2 | * Copyright © 2010 Intel Corporation |
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| 3 | * |
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| 4 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 5 | * copy of this software and associated documentation files (the "Software"), |
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| 6 | * to deal in the Software without restriction, including without limitation |
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| 7 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 8 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 9 | * Software is furnished to do so, subject to the following conditions: |
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| 10 | * |
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| 11 | * The above copyright notice and this permission notice (including the next |
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| 12 | * paragraph) shall be included in all copies or substantial portions of the |
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| 13 | * Software. |
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| 14 | * |
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| 15 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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| 16 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 17 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 18 | * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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| 19 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING |
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| 20 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
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| 21 | * DEALINGS IN THE SOFTWARE. |
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| 22 | */ |
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| 23 | |||
| 24 | /** |
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| 25 | * \file ir_variable_refcount.cpp |
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| 26 | * |
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| 27 | * Provides a visitor which produces a list of variables referenced, |
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| 28 | * how many times they were referenced and assigned, and whether they |
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| 29 | * were defined in the scope. |
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| 30 | */ |
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| 31 | |||
| 32 | #include "ir.h" |
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| 33 | #include "ir_visitor.h" |
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| 34 | #include "ir_variable_refcount.h" |
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| 35 | #include "glsl_types.h" |
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| 36 | #include "util/hash_table.h" |
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| 37 | |||
| 38 | ir_variable_refcount_visitor::ir_variable_refcount_visitor() |
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| 39 | { |
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| 40 | this->mem_ctx = ralloc_context(NULL); |
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| 41 | this->ht = _mesa_hash_table_create(NULL, _mesa_hash_pointer, |
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| 42 | _mesa_key_pointer_equal); |
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| 43 | } |
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| 44 | |||
| 45 | static void |
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| 46 | free_entry(struct hash_entry *entry) |
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| 47 | { |
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| 48 | ir_variable_refcount_entry *ivre = (ir_variable_refcount_entry *) entry->data; |
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| 49 | delete ivre; |
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| 50 | } |
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| 51 | |||
| 52 | ir_variable_refcount_visitor::~ir_variable_refcount_visitor() |
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| 53 | { |
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| 54 | ralloc_free(this->mem_ctx); |
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| 55 | _mesa_hash_table_destroy(this->ht, free_entry); |
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| 56 | } |
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| 57 | |||
| 58 | // constructor |
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| 59 | ir_variable_refcount_entry::ir_variable_refcount_entry(ir_variable *var) |
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| 60 | { |
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| 61 | this->var = var; |
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| 62 | assign = NULL; |
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| 63 | assigned_count = 0; |
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| 64 | declaration = false; |
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| 65 | referenced_count = 0; |
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| 66 | } |
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| 67 | |||
| 68 | |||
| 69 | ir_variable_refcount_entry * |
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| 70 | ir_variable_refcount_visitor::get_variable_entry(ir_variable *var) |
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| 71 | { |
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| 72 | assert(var); |
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| 73 | |||
| 74 | struct hash_entry *e = _mesa_hash_table_search(this->ht, var); |
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| 75 | if (e) |
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| 76 | return (ir_variable_refcount_entry *)e->data; |
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| 77 | |||
| 78 | ir_variable_refcount_entry *entry = new ir_variable_refcount_entry(var); |
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| 79 | assert(entry->referenced_count == 0); |
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| 80 | _mesa_hash_table_insert(this->ht, var, entry); |
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| 81 | |||
| 82 | return entry; |
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| 83 | } |
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| 84 | |||
| 85 | |||
| 86 | ir_visitor_status |
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| 87 | ir_variable_refcount_visitor::visit(ir_variable *ir) |
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| 88 | { |
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| 89 | ir_variable_refcount_entry *entry = this->get_variable_entry(ir); |
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| 90 | if (entry) |
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| 91 | entry->declaration = true; |
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| 92 | |||
| 93 | return visit_continue; |
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| 94 | } |
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| 95 | |||
| 96 | |||
| 97 | ir_visitor_status |
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| 98 | ir_variable_refcount_visitor::visit(ir_dereference_variable *ir) |
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| 99 | { |
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| 100 | ir_variable *const var = ir->variable_referenced(); |
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| 101 | ir_variable_refcount_entry *entry = this->get_variable_entry(var); |
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| 102 | |||
| 103 | if (entry) |
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| 104 | entry->referenced_count++; |
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| 105 | |||
| 106 | return visit_continue; |
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| 107 | } |
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| 108 | |||
| 109 | |||
| 110 | ir_visitor_status |
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| 111 | ir_variable_refcount_visitor::visit_enter(ir_function_signature *ir) |
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| 112 | { |
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| 113 | /* We don't want to descend into the function parameters and |
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| 114 | * dead-code eliminate them, so just accept the body here. |
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| 115 | */ |
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| 116 | visit_list_elements(this, &ir->body); |
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| 117 | return visit_continue_with_parent; |
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| 118 | } |
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| 119 | |||
| 120 | |||
| 121 | ir_visitor_status |
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| 122 | ir_variable_refcount_visitor::visit_leave(ir_assignment *ir) |
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| 123 | { |
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| 124 | ir_variable_refcount_entry *entry; |
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| 125 | entry = this->get_variable_entry(ir->lhs->variable_referenced()); |
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| 126 | if (entry) { |
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| 127 | entry->assigned_count++; |
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| 128 | if (entry->assign == NULL) |
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| 129 | entry->assign = ir; |
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| 130 | } |
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| 131 | |||
| 132 | return visit_continue; |
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| 133 | } |