[GR-47479] [GR-47477] Add GraphUtil.unproxifyExceptLoopProxies helper

PullRequest: graal/15099
oracle · Jul 27, 2023 · 1ee928c · 1ee928c
2 parents 8e6177a + 757d122
commit 1ee928c
Showing 1 changed file with 16 additions and 0 deletions.
diff --git a/compiler/src/jdk.internal.vm.compiler/src/org/graalvm/compiler/nodes/util/GraphUtil.java b/compiler/src/jdk.internal.vm.compiler/src/org/graalvm/compiler/nodes/util/GraphUtil.java
@@ -688,6 +688,22 @@ public static ValueNode unproxify(ValueProxy value) {
         }
     }
 
+    /**
+     * Gets the original value by iterating through all {@link ValueProxy value proxies}, except
+     * {@link ProxyNode ProxyNodes}. That is, this method looks through pi nodes, value anchors,
+     * etc., but it does not enter loops.
+     *
+     * @param original the start value
+     * @return the first non-proxy or loop proxy value encountered
+     */
+    public static ValueNode unproxifyExceptLoopProxies(ValueNode original) {
+        ValueNode node = original;
+        while (node instanceof ValueProxy proxy && !(node instanceof ProxyNode)) {
+            node = proxy.getOriginalNode();
+        }
+        return node;
+    }
+
     public static ValueNode skipPi(ValueNode node) {
         ValueNode n = node;
         while (n instanceof PiNode) {