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comparison graal/com.oracle.truffle.api/src/com/oracle/truffle/api/nodes/Node.java @ 19141:67d9e635102f

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Truffle/Instrumentation: refine checks for safe node replacement
author Michael Van De Vanter <michael.van.de.vanter@oracle.com>
date Tue, 03 Feb 2015 11:48:25 -0800
parents c7e57dffc5ad
children 128586040207
comparison
equal deleted inserted replaced
19103:ccabd82be35c 19141:67d9e635102f
288 reportReplace(this, newNode, reason); 288 reportReplace(this, newNode, reason);
289 onReplace(newNode, reason); 289 onReplace(newNode, reason);
290 } 290 }
291 291
292 /** 292 /**
293 * Checks if this node is properly adopted by its parent. 293 * Checks if this node can be replaced by another node: tree structure & type.
294 *
295 * @return {@code true} if it is structurally safe to replace this node.
296 */
297 public final boolean isReplaceable() {
298 if (getParent() != null) {
299 for (Node sibling : getParent().getChildren()) {
300 if (sibling == this) {
301 return true;
302 }
303 }
304 }
305 return false;
306 }
307
308 /**
309 * Checks if this node can be replaced by another node, both structurally and with type safety.
310 */ 294 */
311 public final boolean isSafelyReplaceableBy(Node newNode) { 295 public final boolean isSafelyReplaceableBy(Node newNode) {
312 return isReplaceable() && NodeUtil.isReplacementSafe(getParent(), this, newNode); 296 return NodeUtil.isReplacementSafe(getParent(), this, newNode);
313 } 297 }
314 298
315 private void reportReplace(Node oldNode, Node newNode, CharSequence reason) { 299 private void reportReplace(Node oldNode, Node newNode, CharSequence reason) {
316 Node node = this; 300 Node node = this;
317 while (node != null) { 301 while (node != null) {