# HG changeset patch
# User Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
# Date 1373233912 -7200
# Node ID ac8b195fd3aa449d4f94d462d9fde5d13051d93c
# Parent  8660a090c3e2535146d6fdb87e50d793e2ea126e
New unsafe cast CompilerDirectives method in Truffle API.

diff -r 8660a090c3e2 -r ac8b195fd3aa graal/com.oracle.graal.truffle/src/com/oracle/graal/truffle/nodes/UnsafeCastMacroNode.java
--- a/graal/com.oracle.graal.truffle/src/com/oracle/graal/truffle/nodes/UnsafeCastMacroNode.java	Sun Jul 07 23:32:05 2013 +0200
+++ b/graal/com.oracle.graal.truffle/src/com/oracle/graal/truffle/nodes/UnsafeCastMacroNode.java	Sun Jul 07 23:51:52 2013 +0200
@@ -41,7 +41,10 @@
             Class c = (Class) arguments.get(1).asConstant().asObject();
             ResolvedJavaType lookupJavaType = tool.runtime().lookupJavaType(c);
             Stamp s = StampFactory.declaredNonNull(lookupJavaType);
-            return graph().unique(new UnsafeCastNode(arguments.get(0), s));
+            ValueAnchorNode valueAnchorNode = graph().add(new ValueAnchorNode());
+            UnsafeCastNode unsafeCast = graph().unique(new UnsafeCastNode(arguments.get(0), s, (GuardingNode) valueAnchorNode));
+            this.replaceAtUsages(unsafeCast);
+            return valueAnchorNode;
         }
         return this;
     }
diff -r 8660a090c3e2 -r ac8b195fd3aa graal/com.oracle.graal.truffle/src/com/oracle/graal/truffle/substitutions/CompilerDirectivesSubstitutions.java
--- a/graal/com.oracle.graal.truffle/src/com/oracle/graal/truffle/substitutions/CompilerDirectivesSubstitutions.java	Sun Jul 07 23:32:05 2013 +0200
+++ b/graal/com.oracle.graal.truffle/src/com/oracle/graal/truffle/substitutions/CompilerDirectivesSubstitutions.java	Sun Jul 07 23:51:52 2013 +0200
@@ -57,4 +57,7 @@
 
     @MacroSubstitution(macro = BailoutNode.class, isStatic = true)
     public static native void bailout(String reason);
+
+    @MacroSubstitution(macro = UnsafeCastMacroNode.class, isStatic = true)
+    public static native Object unsafeCast(Object value, Class clazz);
 }
diff -r 8660a090c3e2 -r ac8b195fd3aa graal/com.oracle.truffle.api/src/com/oracle/truffle/api/CompilerDirectives.java
--- a/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/CompilerDirectives.java	Sun Jul 07 23:32:05 2013 +0200
+++ b/graal/com.oracle.truffle.api/src/com/oracle/truffle/api/CompilerDirectives.java	Sun Jul 07 23:51:52 2013 +0200
@@ -126,4 +126,16 @@
     @Target({ElementType.METHOD})
     public @interface Unsafe {
     }
+
+    /**
+     * Treats the given value as a value of the given class. The class must evaluate to a constant.
+     * 
+     * @param value the value that is known to have the specified type
+     * @param clazz the specified type of the value
+     * @return the value
+     */
+    @Unsafe
+    public static Object unsafeCast(Object value, Class clazz) {
+        return value;
+    }
 }