System.java (setProperties): Only call init_properties() if properties is null.

2000-11-24  Bryce McKinlay  <bryce@albatross.co.nz>

	* java/lang/System.java (setProperties): Only call init_properties()
	if properties is null.
	(getProperties): Ditto.
	(getProperty): Ditto.
	(setProperty): Call init_properties if properties are null.
	(prop_init): Remove field.
	* java/lang/natSystem.cc (init_properties): Synchronize the entire
	method. Check for null properties after synchronizing instead of
	prop_init flag. Set the properties field last for thread safety.

	* java/io/ObjectInputStream.java (ObjectInputStream): If DEBUG is set,
	test for gcj.dumpobjects property and enable object stream dumping
	if it is set.
	(dumpElement): No longer native.
	(dumpElementln): Ditto.
	(setDump): Do not define.
	* java/io/natObjectInputStream.cc (dumpElement): Removed.
	(dumpElementln): Removed.
	(setDump): Removed.

2000-11-24  Bryce McKinlay  <bryce@albatross.co.nz>

	* configure: Rebuilt.
	* Makefile.in: Rebuilt.
	* Makefile.am (built_java_source_files): Add Configuration.java.
	* configure.in: Add Configuration.java to CONFIG_FILES. Set
	LIBGCJDEBUG substitution if --enable-libgcj-debug is specified.
	Create `gnu' directory in the build tree.
	* gnu/classpath/Configuration.java.in: New file.

From-SVN: r37749

libjava/Makefile.am

@@ -758,7 +758,8 @@ java/beans/Visibility.java
 
 ## Java files which are created by configure and thus are in the build
 ## directory.
-built_java_source_files = java/lang/ConcreteProcess.java
+built_java_source_files = java/lang/ConcreteProcess.java \
+                          gnu/classpath/Configuration.java
 
 ## Java files in the core packages java.lang, java.io, and java.util.
 ## These are built before the other source files, in order to reduce 

libjava/Makefile.in

@@ -87,6 +87,7 @@ GCTESTSPEC = @GCTESTSPEC@
 INCLTDL = @INCLTDL@
 JC1GCSPEC = @JC1GCSPEC@
 LIBDATASTARTSPEC = @LIBDATASTARTSPEC@
+LIBGCJDEBUG = @LIBGCJDEBUG@
 LIBGCJTESTSPEC = @LIBGCJTESTSPEC@
 LIBGCJ_CFLAGS = @LIBGCJ_CFLAGS@
 LIBGCJ_CXXFLAGS = @LIBGCJ_CXXFLAGS@
@@ -510,7 +511,9 @@ java/beans/VetoableChangeSupport.java \
 java/beans/Visibility.java
 
 
-built_java_source_files = java/lang/ConcreteProcess.java
+built_java_source_files = java/lang/ConcreteProcess.java \
+                          gnu/classpath/Configuration.java
+
 
 core_java_source_files = \
 java/lang/AbstractMethodError.java \
@@ -1181,8 +1184,9 @@ DEP_FILES =  .deps/$(srcdir)/$(CONVERT_DIR)/gen-from-JIS.P \
 .deps/gnu/awt/xlib/XGraphics.P \
 .deps/gnu/awt/xlib/XGraphicsConfiguration.P \
 .deps/gnu/awt/xlib/XPanelPeer.P .deps/gnu/awt/xlib/XToolkit.P \
-.deps/gnu/gcj/RawData.P .deps/gnu/gcj/awt/BitMaskExtent.P \
-.deps/gnu/gcj/awt/Buffers.P .deps/gnu/gcj/awt/ComponentDataBlitOp.P \
+.deps/gnu/classpath/Configuration.P .deps/gnu/gcj/RawData.P \
+.deps/gnu/gcj/awt/BitMaskExtent.P .deps/gnu/gcj/awt/Buffers.P \
+.deps/gnu/gcj/awt/ComponentDataBlitOp.P \
 .deps/gnu/gcj/awt/GLightweightPeer.P \
 .deps/gnu/gcj/convert/BytesToUnicode.P .deps/gnu/gcj/convert/Convert.P \
 .deps/gnu/gcj/convert/IOConverter.P \

libjava/configure.in

@@ -65,10 +65,13 @@ if test "$enable_getenv_properties" = no; then
 fi
 
 dnl See if the user has requested runtime debugging.
+LIBGCJDEBUG="false"
+AC_SUBST(LIBGCJDEBUG)
 AC_ARG_ENABLE(libgcj-debug,
 [  --enable-libgcj-debug   enable runtime debugging code],
   if test "$enable_libgcj_debug" = yes; then
-     AC_DEFINE(DEBUG)
+    AC_DEFINE(DEBUG)
+    LIBGCJDEBUG="true"
   fi)
 
 dnl See if the user has the interpreter included.
@@ -173,6 +176,7 @@ dnl Create the subdirectory for natFileDescriptor.cc, or the attempt
 dnl to create the link will fail.
 test -d java || mkdir java
 test -d java/io || mkdir java/io
+test -d gnu || mkdir gnu
 AC_LINK_FILES(java/io/$FILE_DESCRIPTOR, java/io/natFileDescriptor.cc)
 
 dnl Likewise for ConcreteProcess.java and natConcreteProcess.cc.
@@ -770,7 +774,7 @@ here=`pwd`
 AC_SUBST(here)
 
 
-AC_OUTPUT(Makefile libgcj.spec libgcj-test.spec gcj/Makefile include/Makefile testsuite/Makefile,
+AC_OUTPUT(Makefile libgcj.spec libgcj-test.spec gnu/classpath/Configuration.java gcj/Makefile include/Makefile testsuite/Makefile,
 [if test -n "$CONFIG_FILES"; then
   ac_file=Makefile . ${libgcj_basedir}/../config-ml.in
 fi

libjava/gnu/classpath/Configuration.java.in

@@ -0,0 +1,14 @@
+// This file defines compile-time constants that can be accessed by java code.
+// It is pre-processed by configure. 
+
+package gnu.classpath;
+
+public interface Configuration
+{
+  // The value of DEBUG is substituted according to whether the
+  // "--enable-libgcj-debug" argument was passed to configure. Code
+  // which is made conditional based on the value of this flag will
+  // be removed by the optimizer in a non-debug build.
+    
+  boolean DEBUG = @LIBGCJDEBUG@;
+}

libjava/java/io/ObjectInputStream.java

@@ -27,6 +27,8 @@ executable file might be covered by the GNU General Public License. */
 
 package java.io;
 
+import gnu.classpath.Configuration;
+
 import java.lang.reflect.Array;
 import java.lang.reflect.Modifier;
 import java.util.Arrays;
@@ -61,6 +63,21 @@ public class ObjectInputStream extends InputStream
   public ObjectInputStream (InputStream in)
     throws IOException, StreamCorruptedException
   {
+    if (Configuration.DEBUG)
+      {
+	String val = System.getProperty("gcj.dumpobjects");
+	if (dump == false && val != null && !val.equals(""))
+	  {
+	    dump = true;
+	    System.out.println ("Serialization debugging enabled");
+	  }
+	else if (dump == true && (val == null || val.equals("")))
+	  {
+	    dump = false;
+	    System.out.println ("Serialization debugging disabled");
+	  }
+      }
+
     this.resolveEnabled = false;
     this.isDeserializing = false;
     this.blockDataPosition = 0;
@@ -1510,24 +1527,19 @@ public class ObjectInputStream extends InputStream
   private boolean fieldsAlreadyRead;
   private Vector validators;
 
-  private static boolean dump;
-  public native static void setDump (boolean dump);
-  private native void dumpElement (String msg);
-  private native void dumpElementln (String msg);
+  private static boolean dump;  
 
-
-/* FIXME: These 2 methods cause a build error on i686-pc-linux-gnu.
-  private void DEBUG (String msg)
+  private void dumpElement (String msg)
   {
-    System.out.print (msg);
+    if (Configuration.DEBUG && dump)  
+      System.out.print(msg);
   }
-
-
-  private void DEBUGln (String msg)
+  
+  private void dumpElementln (String msg)
   {
-    System.out.println (msg);
+    if (Configuration.DEBUG && dump)
+      System.out.println(msg);
   }
-* end FIXME */
 }
 
 

libjava/java/io/natObjectInputStream.cc

@@ -78,40 +78,3 @@ java::io::ObjectInputStream::getMethod (jclass klass, jstring name,
 {
   return klass->getPrivateMethod (name, arg_types);
 }
-
-#ifdef DEBUG
-void
-java::io::ObjectInputStream::setDump (jboolean dump)
-{
-  java::io::ObjectInputStream::dump = dump;
-}
-
-void
-java::io::ObjectInputStream::dumpElement (jstring msg)
-{
-  if (dump)
-    java::lang::System::out->print (msg);
-}
-
-void
-java::io::ObjectInputStream::dumpElementln (jstring msg)
-{
-  if (dump)
-    java::lang::System::out->println (msg);
-}
-#else
-void
-java::io::ObjectInputStream::setDump (jboolean dump)
-{
-}
-
-void
-java::io::ObjectInputStream::dumpElement (jstring msg)
-{
-}
-
-void
-java::io::ObjectInputStream::dumpElementln (jstring msg)
-{
-}
-#endif

libjava/java/lang/System.java

@@ -63,7 +63,8 @@ public final class System
   {
     if (secman != null)
       secman.checkPropertiesAccess();
-    init_properties ();
+    if (properties == null)
+      init_properties ();
     return properties;
   }
 
@@ -71,7 +72,8 @@ public final class System
   {
     if (secman != null)
       secman.checkPropertyAccess(property);
-    init_properties ();
+    if (properties == null)
+      init_properties ();
     return properties.getProperty(property);
   }
 
@@ -79,7 +81,8 @@ public final class System
   {
     if (secman != null)
       secman.checkPropertyAccess(property, defval);
-    init_properties ();
+    if (properties == null)
+      init_properties ();
     return properties.getProperty(property, defval);
   }
 
@@ -128,15 +131,18 @@ public final class System
   {
     if (secman != null)
       secman.checkPropertiesAccess();
-    // We might not have initialized yet.
-    prop_init = true;
-    properties = props;
+    synchronized (System.class)
+    {
+      properties = props;
+    }
   }
 
   public static String setProperty (String key, String value)
   {
     if (secman != null)
       secman.checkPermission (new PropertyPermission (key, "write"));
+    if (properties == null)
+      init_properties ();
     return (String) properties.setProperty (key, value);
   }
 
@@ -165,7 +171,4 @@ public final class System
   // Private data.
   private static SecurityManager secman = null;
   private static Properties properties = null;
-  // This boolean is only required for 1.1 and earlier.  After 1.1, a
-  // null properties should always be re-initialized.
-  private static boolean prop_init = false;
 }

libjava/java/lang/natSystem.cc

@@ -217,18 +217,16 @@ getpwuid_adaptor(T_passwd * (*getpwuid_r)(T_uid user_id, T_passwd *pwd_r,
 void
 java::lang::System::init_properties (void)
 {
-  {
-    // We only need to synchronize around this gatekeeper.
-    JvSynchronize sync (&java::lang::System::class$);
-    if (prop_init)
-      return;
-    prop_init = true;
-  }
+  JvSynchronize sync (&java::lang::System::class$);
+  
+  if (properties != NULL)
+    return;
 
-  properties = new java::util::Properties ();
+  java::util::Properties* newprops = new java::util::Properties ();
+  
   // A convenience define.
 #define SET(Prop,Val) \
-	properties->put(JvNewStringLatin1 (Prop), JvNewStringLatin1 (Val))
+	newprops->put(JvNewStringLatin1 (Prop), JvNewStringLatin1 (Val))
 
   // A mixture of the Java Product Versioning Specification
   // (introduced in 1.2), and earlier versioning properties.
@@ -351,7 +349,7 @@ java::lang::System::init_properties (void)
 	;
       jstring name = JvNewStringLatin1 (p, s - p);
       jstring val = JvNewStringLatin1 (*s == '=' ? s + 1 : s);
-      properties->put (name, val);
+      newprops->put (name, val);
     }
 
   // Set the system properties from the user's environment.
@@ -368,13 +366,13 @@ java::lang::System::init_properties (void)
     }
 
   if (_Jv_Jar_Class_Path)
-    properties->put(JvNewStringLatin1 ("java.class.path"),
-		    JvNewStringLatin1 (_Jv_Jar_Class_Path));
+    newprops->put(JvNewStringLatin1 ("java.class.path"),
+		  JvNewStringLatin1 (_Jv_Jar_Class_Path));
   else
     {
       // FIXME: find libgcj.zip and append its path?
       char *classpath = ::getenv("CLASSPATH");
-      jstring cp = properties->getProperty (JvNewStringLatin1("java.class.path"));
+      jstring cp = newprops->getProperty (JvNewStringLatin1("java.class.path"));
       java::lang::StringBuffer *sb = new java::lang::StringBuffer ();
       
       if (classpath)
@@ -391,7 +389,11 @@ java::lang::System::init_properties (void)
       else
 	sb->append ((jchar) '.');
       
-      properties->put(JvNewStringLatin1 ("java.class.path"),
+      newprops->put(JvNewStringLatin1 ("java.class.path"),
 		      sb->toString ());
     }
+  // Finally, set the field. This ensures that concurrent getProperty() 
+  // calls will return initialized values without requiring them to be 
+  // synchronized in the common case.
+  properties = newprops;
 }