From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- libjava/gnu/gcj/runtime/SharedLibHelper.java | 224 +++++++++++++++++++++++++++ 1 file changed, 224 insertions(+) create mode 100644 libjava/gnu/gcj/runtime/SharedLibHelper.java (limited to 'libjava/gnu/gcj/runtime/SharedLibHelper.java') diff --git a/libjava/gnu/gcj/runtime/SharedLibHelper.java b/libjava/gnu/gcj/runtime/SharedLibHelper.java new file mode 100644 index 000000000..bdf7c0453 --- /dev/null +++ b/libjava/gnu/gcj/runtime/SharedLibHelper.java @@ -0,0 +1,224 @@ +/* Copyright (C) 2001, 2003, 2004, 2005 Free Software Foundation + + This file is part of libgcj. + +This software is copyrighted work licensed under the terms of the +Libgcj License. Please consult the file "LIBGCJ_LICENSE" for +details. */ + +package gnu.gcj.runtime; +import java.lang.ref.WeakReference; +import java.net.URL; +import java.net.MalformedURLException; +import java.util.HashMap; +import java.security.*; +import gnu.gcj.Core; +import java.util.Set; +import java.util.Iterator; +import java.util.HashSet; +import java.util.HashMap; +import java.nio.channels.FileChannel; +import java.io.*; + +public class SharedLibHelper +{ + /** Load a shared library, and associate a ClassLoader with it. + * @param libname named of shared library (passed to dlopen) + * @param parent the parent ClassLoader + * @parem flags passed to dlopen + */ + SharedLibHelper(String libname, ClassLoader parent, CodeSource source, + ProtectionDomain domain, int flags) + { + // FIXME: ask security manager first. + loader = parent; + baseName = libname; + if (domain == null) + domain = new ProtectionDomain(source, + Policy.getPolicy().getPermissions(source)); + this.domain = domain; + this.flags = flags; + } + + public static SharedLibHelper findHelper (String libname) + { + synchronized (map) + { + Set s = (Set)map.get(libname); + if (s == null) + return null; + for (Iterator i=s.iterator(); i.hasNext();) + { + WeakReference ref = (WeakReference)i.next(); + if (ref != null) + return (SharedLibHelper) ref.get(); + } + return null; + } + } + + static void copyFile (File in, File out) throws IOException + { + FileChannel source = new FileInputStream(in).getChannel(); + FileChannel destination = new FileOutputStream(out).getChannel(); + source.transferTo(0, source.size(), destination); + source.close(); + destination.close(); + } + + public static SharedLibHelper findHelper (ClassLoader loader, String libname, + CodeSource source, + boolean tryParents) + { + return findHelper (loader, libname, source, null, tryParents); + } + + public static SharedLibHelper findHelper (ClassLoader loader, String libname, + CodeSource source, + ProtectionDomain domain, + boolean tryParents) + { + synchronized (map) + { + SharedLibHelper result; + Set s = (Set)map.get(libname); + if (s == null) + { + s = new HashSet(); + map.put(libname, s); + } + else + { + for (Iterator i=s.iterator(); i.hasNext();) + { + WeakReference ref = (WeakReference)i.next(); + if (ref != null) + { + result = (SharedLibHelper) ref.get(); + if (result != null) + { + // A match succeeds if the library is already + // loaded by LOADER or any of its ancestors. + ClassLoader l = loader; + do + { + if (result.loader == l) + return result; + l = l.getParent(); + } + while (tryParents && l != null); + } + } + } + + // Oh dear. We've already mapped this shared library, but + // with a different class loader. We need to copy it. + try + { + File copy + = File.createTempFile(new File(libname).getName(), + ".so", new File ("/tmp")); + File src = new File(libname); + copyFile (src, copy); + copy.deleteOnExit(); + libname = copy.getPath(); + } + catch (IOException e) + { + return null; + } + } + result = new SharedLibHelper(libname, loader, source, domain, 0); + s.add(new WeakReference(result)); + return result; + } + } + + public native void finalize (); + + public Class findClass(String name) + { + ensureInit(); + Class result = (Class) classMap.get(name); + if (result != null) + { + // We never want to return a class without its supers linked. + // It isn't clear from the spec, but this is what other + // implementations do in practice. + ensureSupersLinked(result); + } + return result; + } + + public URL findResource (String name) + { + ensureInit(); + if (! hasResource(name)) + return null; + try + { + return new URL("gcjlib", "", -1, baseName + "!/" + name); + } + catch (MalformedURLException _) + { + } + return null; + } + + public native Core findCore (String name); + + void ensureInit() + { + synchronized (classMap) + { + if (initialized) + return; + init(); + initialized = true; + } + } + + native boolean hasResource(String name); + native void init(); + native void ensureSupersLinked(Class k); + + public String toString () + { + return "shared object " + baseName; + } + + /** Called during dlopen's processing of the init section. */ + void registerClass(String name, Class cls) + { + classMap.put(name, cls); + } + + /** The handle returned by dlopen. */ + gnu.gcj.RawData handler; + + /** Holds a _Jv_core_chain for the loader. */ + gnu.gcj.RawData core_chain; + + /** Map classnames to Classes. */ + HashMap classMap = new HashMap(20); + + /** Class loader we're helping. */ + ClassLoader loader; + + /** Name of base file. */ + String baseName; + + /** Protection domain for loaded classes. */ + ProtectionDomain domain; + + /** Flags to pass to dlopen. FIXME: platform dependent. + 0 is always "sensible" (defined by us). */ + int flags; + + /** True if we've been initialized. */ + boolean initialized = false; + + /** Map shared library names to a helper object. This uses weak + references in the values so we don't prevent collection. */ + static HashMap map = new HashMap (); +} -- cgit v1.2.3