gnu.classpath
Class VMStackWalker
This class provides access to the classes on the Java stack
for reflection and security purposes.
This class is only available to privileged code (i.e., code loaded
by the bootstrap loader).
clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait |
firstNonNullClassLoader
public static ClassLoader firstNonNullClassLoader()
Walk up the stack and return the first non-null class loader.
If there aren't any non-null class loaders on the stack, return null.
getCallingClass
public static Class<T> getCallingClass()
Get the class associated with the method invoking the method
invoking this method, or
null if the stack is not
that deep (e.g., invoked via JNI invocation API). This method
is an optimization for the expression
getClassContext()[1]
and should return the same result.
When compiling to native code gcj translates calls to this
method into calls to
getCallingClass(addr), with
addr being the address of the method calling this
method.
getCallingClass(addr) does not unwind the
stack, so is therefore more efficient.
getCallingClassLoader
public static ClassLoader getCallingClassLoader()
Get the class loader associated with the Class returned by
getCallingClass(), or
null if no such class
exists or it is the boot loader. This method is an optimization for the
expression
VMStackWalker.getClassLoader(getClassContext()[1])
and should return the same result.
When compiling to native code gcj translates calls to this
method into calls to
getCallingClassLoader(addr),
with
addr being the address of the method calling
this method.
getCallingClassLoader(addr) does not
unwind the stack, so is therefore more efficient.
getClassContext
public static Class<T>[] getClassContext()
Get a list of all the classes currently executing methods on the
Java stack.
getClassContext()[0] is the class associated
with the currently executing method, i.e., the method that called
VMStackWalker.getClassContext() (possibly through
reflection). So you may need to pop off these stack frames from
the top of the stack:
VMStackWalker.getClassContext()
Method.invoke()
- an array of the declaring classes of each stack frame
getClassLoader
public static ClassLoader getClassLoader(Class<T> cl)
Retrieve the class's ClassLoader, or null if loaded
by the bootstrap loader. I.e., this should return the same thing
as java.lang.VMClass.getClassLoader. This duplicate version
is here to work around access permissions.
VMStackWalker.java -- Reference implementation of VM hooks for stack access
Copyright (C) 2005, 2006 Free Software Foundation
This file is part of GNU Classpath.
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