From 7d079fd7802763efd8c2d8856117b5df0b3a14e4 Mon Sep 17 00:00:00 2001
From: Michal Krol <mjkrol@gmail.org>
Date: Mon, 17 Jan 2005 16:01:49 +0000
Subject: 2005-oct-19 3dlabs slang compiler, tweaked a little bit

---
 .../slang/MachineIndependent/QualifierAlive.cpp    | 91 ++++++++++++++++++++++
 1 file changed, 91 insertions(+)
 create mode 100755 src/mesa/shader/slang/MachineIndependent/QualifierAlive.cpp

(limited to 'src/mesa/shader/slang/MachineIndependent/QualifierAlive.cpp')

diff --git a/src/mesa/shader/slang/MachineIndependent/QualifierAlive.cpp b/src/mesa/shader/slang/MachineIndependent/QualifierAlive.cpp
new file mode 100755
index 0000000000..d7846e0ddb
--- /dev/null
+++ b/src/mesa/shader/slang/MachineIndependent/QualifierAlive.cpp
@@ -0,0 +1,91 @@
+//
+//Copyright (C) 2002-2004  3Dlabs Inc. Ltd.
+//All rights reserved.
+//
+//Redistribution and use in source and binary forms, with or without
+//modification, are permitted provided that the following conditions
+//are met:
+//
+//    Redistributions of source code must retain the above copyright
+//    notice, this list of conditions and the following disclaimer.
+//
+//    Redistributions in binary form must reproduce the above
+//    copyright notice, this list of conditions and the following
+//    disclaimer in the documentation and/or other materials provided
+//    with the distribution.
+//
+//    Neither the name of 3Dlabs Inc. Ltd. nor the names of its
+//    contributors may be used to endorse or promote products derived
+//    from this software without specific prior written permission.
+//
+//THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+//"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+//LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+//FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+//COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+//INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+//BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+//LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+//CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+//LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+//ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+//POSSIBILITY OF SUCH DAMAGE.
+//
+
+#include "../Include/intermediate.h"
+
+class TAliveTraverser : public TIntermTraverser {
+public:
+    TAliveTraverser(TQualifier q) : TIntermTraverser(), found(false), qualifier(q)
+    {
+        visitSymbol    = AliveSymbol;
+        visitSelection = AliveSelection;
+        rightToLeft    = true;
+    }
+    bool wasFound() { return found; }
+protected:
+    bool found;
+    TQualifier qualifier;
+
+    friend void AliveSymbol(TIntermSymbol*, TIntermTraverser*);
+    friend bool AliveSelection(bool, TIntermSelection*, TIntermTraverser*);
+};
+
+//
+// Report whether or not a variable of the given qualifier type
+// is guaranteed written.  Not always possible to determine if
+// it is written conditionally.
+//
+// ?? It does not do this well yet, this is just a place holder
+// that simply determines if it was reference at all, anywhere.
+//
+bool QualifierWritten(TIntermNode* node, TQualifier qualifier)
+{
+    TAliveTraverser it(qualifier);
+
+    if (node)
+        node->traverse(&it);
+
+    return it.wasFound();
+}
+
+void AliveSymbol(TIntermSymbol* node, TIntermTraverser* it)
+{
+    TAliveTraverser* lit = static_cast<TAliveTraverser*>(it);
+
+    //
+    // If it's what we're looking for, record it.
+    //
+    if (node->getQualifier() == lit->qualifier)
+        lit->found = true;
+}
+
+bool AliveSelection(bool preVisit, TIntermSelection* node, TIntermTraverser* it)
+{
+    TAliveTraverser* lit = static_cast<TAliveTraverser*>(it);
+
+    if (lit->wasFound())
+        return false;
+
+    return true;
+}
-- 
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