--- a/nashorn/src/jdk/internal/dynalink/DynamicLinker.java Mon Jul 15 16:35:38 2013 +0200
+++ b/nashorn/src/jdk/internal/dynalink/DynamicLinker.java Mon Jul 15 16:58:23 2013 +0200
@@ -144,6 +144,9 @@
private static final String CLASS_NAME = DynamicLinker.class.getName();
private static final String RELINK_METHOD_NAME = "relink";
+ private static final String INITIAL_LINK_CLASS_NAME = "java.lang.invoke.MethodHandleNatives";
+ private static final String INITIAL_LINK_METHOD_NAME = "linkCallSite";
+
private final LinkerServices linkerServices;
private final int runtimeContextArgCount;
private final boolean syncOnRelink;
@@ -262,20 +265,54 @@
}
/**
- * Returns a stack trace element describing the location of the call site currently being relinked on the current
+ * Returns a stack trace element describing the location of the call site currently being linked on the current
* thread. The operation internally creates a Throwable object and inspects its stack trace, so it's potentially
* expensive. The recommended usage for it is in writing diagnostics code.
- * @return a stack trace element describing the location of the call site currently being relinked, or null if it is
- * not invoked while a call site is being relinked.
+ * @return a stack trace element describing the location of the call site currently being linked, or null if it is
+ * not invoked while a call site is being linked.
*/
- public static StackTraceElement getRelinkedCallSiteLocation() {
+ public static StackTraceElement getLinkedCallSiteLocation() {
final StackTraceElement[] trace = new Throwable().getStackTrace();
for(int i = 0; i < trace.length - 1; ++i) {
final StackTraceElement frame = trace[i];
- if(RELINK_METHOD_NAME.equals(frame.getMethodName()) && CLASS_NAME.equals(frame.getClassName())) {
+ if(isRelinkFrame(frame) || isInitialLinkFrame(frame)) {
return trace[i + 1];
}
}
return null;
}
+
+ /**
+ * Deprecated because of not precise name.
+ * @deprecated Use {@link #getLinkedCallSiteLocation()} instead.
+ * @return see non-deprecated method
+ */
+ @Deprecated
+ public static StackTraceElement getRelinkedCallSiteLocation() {
+ return getLinkedCallSiteLocation();
+ }
+
+ /**
+ * Returns true if the frame represents {@code MethodHandleNatives.linkCallSite()}, the frame immediately on top of
+ * the call site frame when the call site is being linked for the first time.
+ * @param frame the frame
+ * @return true if this frame represents {@code MethodHandleNatives.linkCallSite()}
+ */
+ private static boolean isInitialLinkFrame(final StackTraceElement frame) {
+ return testFrame(frame, INITIAL_LINK_METHOD_NAME, INITIAL_LINK_CLASS_NAME);
+ }
+
+ /**
+ * Returns true if the frame represents {@code DynamicLinker.relink()}, the frame immediately on top of the call
+ * site frame when the call site is being relinked (linked for second and subsequent times).
+ * @param frame the frame
+ * @return true if this frame represents {@code DynamicLinker.relink()}
+ */
+ private static boolean isRelinkFrame(final StackTraceElement frame) {
+ return testFrame(frame, RELINK_METHOD_NAME, CLASS_NAME);
+ }
+
+ private static boolean testFrame(final StackTraceElement frame, final String methodName, final String className) {
+ return methodName.equals(frame.getMethodName()) && className.equals(frame.getClassName());
+ }
}