1 files changed, 91 insertions, 0 deletions
diff --git a/src/proguard/optimize/info/NoSideEffectMethodMarker.java b/src/proguard/optimize/info/NoSideEffectMethodMarker.java
new file mode 100644
index 0000000..5c78408
--- /dev/null
+++ b/src/proguard/optimize/info/NoSideEffectMethodMarker.java
@@ -0,0 +1,91 @@
+/*
+ * ProGuard -- shrinking, optimization, obfuscation, and preverification
+ *             of Java bytecode.
+ *
+ * Copyright (c) 2002-2009 Eric Lafortune (eric@graphics.cornell.edu)
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+package proguard.optimize.info;
+
+import proguard.classfile.*;
+import proguard.classfile.util.*;
+import proguard.classfile.visitor.MemberVisitor;
+
+/**
+ * This MemberVisitor marks all methods that it visits as not having any side
+ * effects. It will make the SideEffectMethodMarker consider them as such
+ * without further analysis.
+ *
+ * @see SideEffectMethodMarker
+ * @author Eric Lafortune
+ */
+public class NoSideEffectMethodMarker
+extends      SimplifiedVisitor
+implements   MemberVisitor
+{
+    // A visitor info flag to indicate the visitor accepter is being kept,
+    // but that it doesn't have any side effects.
+    private static final Object KEPT_BUT_NO_SIDE_EFFECTS = new Object();
+
+
+    // Implementations for MemberVisitor.
+
+    public void visitAnyMember(Clazz Clazz, Member member)
+    {
+        // Ignore any attempts to mark fields.
+    }
+
+
+    public void visitProgramMethod(ProgramClass programClass, ProgramMethod programMethod)
+    {
+        markNoSideEffects(programMethod);
+    }
+
+
+    public void visitLibraryMethod(LibraryClass libraryClass, LibraryMethod libraryMethod)
+    {
+        markNoSideEffects(libraryMethod);
+    }
+
+
+    // Small utility methods.
+
+    private static void markNoSideEffects(Method method)
+    {
+        MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method);
+        if (info != null)
+        {
+            info.setNoSideEffects();
+        }
+        else
+        {
+            MethodLinker.lastMember(method).setVisitorInfo(KEPT_BUT_NO_SIDE_EFFECTS);
+        }
+    }
+
+
+    public static boolean hasNoSideEffects(Method method)
+    {
+        if (MethodLinker.lastVisitorAccepter(method).getVisitorInfo() == KEPT_BUT_NO_SIDE_EFFECTS)
+        {
+            return true;
+        }
+
+        MethodOptimizationInfo info = MethodOptimizationInfo.getMethodOptimizationInfo(method);
+        return info != null &&
+               info.hasNoSideEffects();
+    }
+}