aboutsummaryrefslogtreecommitdiff
path: root/mesalib/src/glsl/ir_variable_refcount.cpp
diff options
context:
space:
mode:
authormarha <marha@users.sourceforge.net>2010-11-22 19:42:40 +0000
committermarha <marha@users.sourceforge.net>2010-11-22 19:42:40 +0000
commit85ef9930f56bf15181f9a0b238f03d55303cf411 (patch)
tree63b43286956ebd1c35c96e9b3d5305aabdf71a0f /mesalib/src/glsl/ir_variable_refcount.cpp
parent94810d19989336862251dbf69c3f3acb18a9b06d (diff)
downloadvcxsrv-85ef9930f56bf15181f9a0b238f03d55303cf411.tar.gz
vcxsrv-85ef9930f56bf15181f9a0b238f03d55303cf411.tar.bz2
vcxsrv-85ef9930f56bf15181f9a0b238f03d55303cf411.zip
Updated to mesalib 7.9
Diffstat (limited to 'mesalib/src/glsl/ir_variable_refcount.cpp')
-rw-r--r--mesalib/src/glsl/ir_variable_refcount.cpp113
1 files changed, 113 insertions, 0 deletions
diff --git a/mesalib/src/glsl/ir_variable_refcount.cpp b/mesalib/src/glsl/ir_variable_refcount.cpp
new file mode 100644
index 000000000..7d39abb36
--- /dev/null
+++ b/mesalib/src/glsl/ir_variable_refcount.cpp
@@ -0,0 +1,113 @@
+/*
+ * Copyright © 2010 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_variable_refcount.cpp
+ *
+ * Provides a visitor which produces a list of variables referenced,
+ * how many times they were referenced and assigned, and whether they
+ * were defined in the scope.
+ */
+
+#include "ir.h"
+#include "ir_visitor.h"
+#include "ir_variable_refcount.h"
+#include "glsl_types.h"
+
+
+// constructor
+variable_entry::variable_entry(ir_variable *var)
+{
+ this->var = var;
+ assign = NULL;
+ assigned_count = 0;
+ declaration = false;
+ referenced_count = 0;
+}
+
+
+variable_entry *
+ir_variable_refcount_visitor::get_variable_entry(ir_variable *var)
+{
+ assert(var);
+ foreach_iter(exec_list_iterator, iter, this->variable_list) {
+ variable_entry *entry = (variable_entry *)iter.get();
+ if (entry->var == var)
+ return entry;
+ }
+
+ variable_entry *entry = new(mem_ctx) variable_entry(var);
+ assert(entry->referenced_count == 0);
+ this->variable_list.push_tail(entry);
+ return entry;
+}
+
+
+ir_visitor_status
+ir_variable_refcount_visitor::visit(ir_variable *ir)
+{
+ variable_entry *entry = this->get_variable_entry(ir);
+ if (entry)
+ entry->declaration = true;
+
+ return visit_continue;
+}
+
+
+ir_visitor_status
+ir_variable_refcount_visitor::visit(ir_dereference_variable *ir)
+{
+ ir_variable *const var = ir->variable_referenced();
+ variable_entry *entry = this->get_variable_entry(var);
+
+ if (entry)
+ entry->referenced_count++;
+
+ return visit_continue;
+}
+
+
+ir_visitor_status
+ir_variable_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;
+}
+
+
+ir_visitor_status
+ir_variable_refcount_visitor::visit_leave(ir_assignment *ir)
+{
+ variable_entry *entry;
+ entry = this->get_variable_entry(ir->lhs->variable_referenced());
+ if (entry) {
+ entry->assigned_count++;
+ if (entry->assign == NULL)
+ entry->assign = ir;
+ }
+
+ return visit_continue;
+}