diff options
Diffstat (limited to 'src/compiler/glsl/ir_array_refcount.cpp')
-rw-r--r-- | src/compiler/glsl/ir_array_refcount.cpp | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/src/compiler/glsl/ir_array_refcount.cpp b/src/compiler/glsl/ir_array_refcount.cpp new file mode 100644 index 00000000000..b997d415d1d --- /dev/null +++ b/src/compiler/glsl/ir_array_refcount.cpp @@ -0,0 +1,99 @@ +/* + * Copyright © 2016 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + */ + +/** + * \file ir_array_refcount.cpp + * + * Provides a visitor which produces a list of variables referenced. + */ + +#include "ir.h" +#include "ir_visitor.h" +#include "ir_array_refcount.h" +#include "compiler/glsl_types.h" +#include "util/hash_table.h" + +ir_array_refcount_visitor::ir_array_refcount_visitor() +{ + this->mem_ctx = ralloc_context(NULL); + this->ht = _mesa_hash_table_create(NULL, _mesa_hash_pointer, + _mesa_key_pointer_equal); +} + +static void +free_entry(struct hash_entry *entry) +{ + ir_array_refcount_entry *ivre = (ir_array_refcount_entry *) entry->data; + delete ivre; +} + +ir_array_refcount_visitor::~ir_array_refcount_visitor() +{ + ralloc_free(this->mem_ctx); + _mesa_hash_table_destroy(this->ht, free_entry); +} + +ir_array_refcount_entry::ir_array_refcount_entry(ir_variable *var) + : var(var), is_referenced(false) +{ + /* empty */ +} + + +ir_array_refcount_entry * +ir_array_refcount_visitor::get_variable_entry(ir_variable *var) +{ + assert(var); + + struct hash_entry *e = _mesa_hash_table_search(this->ht, var); + if (e) + return (ir_array_refcount_entry *)e->data; + + ir_array_refcount_entry *entry = new ir_array_refcount_entry(var); + _mesa_hash_table_insert(this->ht, var, entry); + + return entry; +} + + +ir_visitor_status +ir_array_refcount_visitor::visit(ir_dereference_variable *ir) +{ + ir_variable *const var = ir->variable_referenced(); + ir_array_refcount_entry *entry = this->get_variable_entry(var); + + entry->is_referenced = true; + + return visit_continue; +} + + +ir_visitor_status +ir_array_refcount_visitor::visit_enter(ir_function_signature *ir) +{ + /* We don't want to descend into the function parameters and + * dead-code eliminate them, so just accept the body here. + */ + visit_list_elements(this, &ir->body); + return visit_continue_with_parent; +} |