[Fb-contrib-commit] SF.net SVN: fb-contrib: [413] trunk/fb-contrib/src/com/mebigfatguy/fbcontrib/detect/BloatedSynchronizedBlock.java

[<dbr...@us...>]

Revision: 413
Author:   dbrosius
Date:     2006-04-08 07:10:32 -0700 (Sat, 08 Apr 2006)
ViewCVS:  http://svn.sourceforge.net/fb-contrib/?rev=413&view=rev

Log Message:
-----------
prescreen for MONITORENTER opcodes

Modified Paths:
--------------
    trunk/fb-contrib/src/com/mebigfatguy/fbcontrib/detect/BloatedSynchronizedBlock.java
Modified: trunk/fb-contrib/src/com/mebigfatguy/fbcontrib/detect/BloatedSynchronizedBlock.java
===================================================================
--- trunk/fb-contrib/src/com/mebigfatguy/fbcontrib/detect/BloatedSynchronizedBlock.java	2006-04-08 14:10:00 UTC (rev 412)
+++ trunk/fb-contrib/src/com/mebigfatguy/fbcontrib/detect/BloatedSynchronizedBlock.java	2006-04-08 14:10:32 UTC (rev 413)
@@ -18,15 +18,19 @@
  */
 package com.mebigfatguy.fbcontrib.detect;
 
+import java.util.BitSet;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
 
+import org.apache.bcel.Constants;
+import org.apache.bcel.classfile.Code;
 import org.apache.bcel.classfile.Method;
 import org.apache.bcel.generic.Type;
 
 import com.mebigfatguy.fbcontrib.utils.RegisterUtils;
+import com.mebigfatguy.fbcontrib.utils.VersionTransition;
 
 import edu.umd.cs.findbugs.BugInstance;
 import edu.umd.cs.findbugs.BugReporter;
@@ -73,22 +77,36 @@
 	}
 	
 	/**
+	 * looks for methods that contain a MONITORENTER opcodes
+	 * 
+	 * @param method the context object of the current method
+	 * @return if the class uses synchronization
+	 */
+	public boolean prescreen(Method method) {
+		BitSet bytecodeSet = VersionTransition.getBytecodeSet(getClassContext(), method);
+		return (bytecodeSet != null) && (bytecodeSet.get(Constants.MONITORENTER));
+	}
+
+	/**
 	 * implement the visitor to reset the sync count, the stack, and gather some information
 	 * 
 	 * @param obj the context object for the currently parsed method
 	 */
 	@Override
-	public void visitMethod(Method obj) {
-		if (obj.isSynchronized())
-			syncPC = 0;
-		else
-			syncPC = -1;
-		isStatic = obj.isStatic();
-		unsafeAliases.clear();
-		unsafeAliases.add(new Integer(0));
-		branchInfo.clear();
-		unsafeCallOccurred = false;
-		stack.resetForMethodEntry(this);
+	public void visitCode(Code obj) {
+		Method m = getMethod();
+		if (prescreen(m)) {
+			if (m.isSynchronized())
+				syncPC = 0;
+			else
+				syncPC = -1;
+			isStatic = m.isStatic();
+			unsafeAliases.clear();
+			unsafeAliases.add(new Integer(0));
+			branchInfo.clear();
+			unsafeCallOccurred = false;
+			stack.resetForMethodEntry(this);
+		}
 	}
 	
 	/** 


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