# HG changeset patch
# User Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
# Date 1370819793 -7200
# Node ID 5d91b0b67cbabb967fa928637f0ad4be1f3ec0b0
# Parent  c73690957f9b7ca6075157977b8680a027802a52
Introduce Frame.isInitialized in the Truffle API.

diff -r c73690957f9b -r 5d91b0b67cba graal/com.oracle.truffle.api/src/com/oracle/truffle/api/frame/Frame.java
--- a/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/frame/Frame.java	Mon Jun 10 01:08:23 2013 +0200
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/frame/Frame.java	Mon Jun 10 01:16:33 2013 +0200
@@ -170,4 +170,13 @@
      * @return the new materialized frame
      */
     MaterializedFrame materialize();
+
+    /**
+     * To check whether the given {@link FrameSlot} has been initialized or not. An initialized slot
+     * has previously been read or modified.
+     * 
+     * @param slot the slot
+     * @return true if the slot is uninitialized.
+     */
+    boolean isInitialized(FrameSlot slot);
 }
diff -r c73690957f9b -r 5d91b0b67cba graal/com.oracle.truffle.api/src/com/oracle/truffle/api/frame/FrameDescriptor.java
--- a/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/frame/FrameDescriptor.java	Mon Jun 10 01:08:23 2013 +0200
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/frame/FrameDescriptor.java	Mon Jun 10 01:16:33 2013 +0200
@@ -112,6 +112,13 @@
         return clonedFrameDescriptor;
     }
 
+    public FrameDescriptor shallowCopy() {
+        FrameDescriptor clonedFrameDescriptor = new FrameDescriptor(this.typeConversion);
+        clonedFrameDescriptor.slots.addAll(slots);
+        clonedFrameDescriptor.identifierToSlotMap.putAll(identifierToSlotMap);
+        return clonedFrameDescriptor;
+    }
+
     void updateVersion() {
         version.invalidate();
         version = createVersion();
diff -r c73690957f9b -r 5d91b0b67cba graal/com.oracle.truffle.api/src/com/oracle/truffle/api/frame/FrameSlotImpl.java
--- a/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/frame/FrameSlotImpl.java	Mon Jun 10 01:08:23 2013 +0200
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/frame/FrameSlotImpl.java	Mon Jun 10 01:16:33 2013 +0200
@@ -29,7 +29,7 @@
     private final int index;
     private FrameSlotKind kind;
 
-    protected FrameSlotImpl(FrameDescriptor descriptor, Object identifier, int index, FrameSlotKind kind) {
+    public FrameSlotImpl(FrameDescriptor descriptor, Object identifier, int index, FrameSlotKind kind) {
         this.descriptor = descriptor;
         this.identifier = identifier;
         this.index = index;
diff -r c73690957f9b -r 5d91b0b67cba graal/com.oracle.truffle.api/src/com/oracle/truffle/api/frame/NativeFrame.java
--- a/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/frame/NativeFrame.java	Mon Jun 10 01:08:23 2013 +0200
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/frame/NativeFrame.java	Mon Jun 10 01:16:33 2013 +0200
@@ -133,4 +133,9 @@
     public FrameDescriptor getFrameDescriptor() {
         throw new UnsupportedOperationException("native frame");
     }
+
+    @Override
+    public boolean isInitialized(FrameSlot slot) {
+        throw new UnsupportedOperationException("native frame");
+    }
 }
diff -r c73690957f9b -r 5d91b0b67cba graal/com.oracle.truffle.api/src/com/oracle/truffle/api/impl/DefaultMaterializedFrame.java
--- a/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/impl/DefaultMaterializedFrame.java	Mon Jun 10 01:08:23 2013 +0200
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/impl/DefaultMaterializedFrame.java	Mon Jun 10 01:16:33 2013 +0200
@@ -122,4 +122,9 @@
     public FrameDescriptor getFrameDescriptor() {
         return wrapped.getFrameDescriptor();
     }
+
+    @Override
+    public boolean isInitialized(FrameSlot slot) {
+        return wrapped.isInitialized(slot);
+    }
 }
diff -r c73690957f9b -r 5d91b0b67cba graal/com.oracle.truffle.api/src/com/oracle/truffle/api/impl/DefaultVirtualFrame.java
--- a/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/impl/DefaultVirtualFrame.java	Mon Jun 10 01:08:23 2013 +0200
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/impl/DefaultVirtualFrame.java	Mon Jun 10 01:16:33 2013 +0200
@@ -201,4 +201,9 @@
             tags = Arrays.copyOf(tags, newSize);
         }
     }
+
+    @Override
+    public boolean isInitialized(FrameSlot slot) {
+        return (this.tags[slot.getIndex()] != FrameSlotKind.Illegal.ordinal());
+    }
 }