https://bugs.openjdk.java.net/browse/JDK-8214329 http://cr.openjdk.java.net/~dlong/8214329/webrev/
In "8212605: Pure-Java implementation of AccessController.doPrivileged", the stackwalk in JVM_GetStackAccessControlContext was changed from using a vframeStream to using a javaVFrame, so that it could access locals. However this caused a regression because javaVFrame has more overhead. JDK-8215205 fixes the problem by allowing the use of javaVFrame only when needed.
This change reverts JVM_GetStackAccessControlContext back to using vframeStream, and uses the new API in JDK-8215205 to get a javaVFrame lazily. It also removes two unnecessary calls to java_sender().
dl
