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jdk-24/hotspot/src/share/vm/classfile/classLoader.cpp

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2007-12-01 00:00:00 +00:00
/*
* Copyright 1997-2007 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*
*/
#include "incls/_precompiled.incl"
#include "incls/_classLoader.cpp.incl"
// Entry points in zip.dll for loading zip/jar file entries
typedef void * * (JNICALL *ZipOpen_t)(const char *name, char **pmsg);
typedef void (JNICALL *ZipClose_t)(jzfile *zip);
typedef jzentry* (JNICALL *FindEntry_t)(jzfile *zip, const char *name, jint *sizeP, jint *nameLen);
typedef jboolean (JNICALL *ReadEntry_t)(jzfile *zip, jzentry *entry, unsigned char *buf, char *namebuf);
typedef jboolean (JNICALL *ReadMappedEntry_t)(jzfile *zip, jzentry *entry, unsigned char **buf, char *namebuf);
typedef jzentry* (JNICALL *GetNextEntry_t)(jzfile *zip, jint n);
static ZipOpen_t ZipOpen = NULL;
static ZipClose_t ZipClose = NULL;
static FindEntry_t FindEntry = NULL;
static ReadEntry_t ReadEntry = NULL;
static ReadMappedEntry_t ReadMappedEntry = NULL;
static GetNextEntry_t GetNextEntry = NULL;
static canonicalize_fn_t CanonicalizeEntry = NULL;
// Globals
PerfCounter* ClassLoader::_perf_accumulated_time = NULL;
PerfCounter* ClassLoader::_perf_classes_inited = NULL;
PerfCounter* ClassLoader::_perf_class_init_time = NULL;
PerfCounter* ClassLoader::_perf_class_verify_time = NULL;
PerfCounter* ClassLoader::_perf_classes_linked = NULL;
PerfCounter* ClassLoader::_perf_class_link_time = NULL;
PerfCounter* ClassLoader::_sync_systemLoaderLockContentionRate = NULL;
PerfCounter* ClassLoader::_sync_nonSystemLoaderLockContentionRate = NULL;
PerfCounter* ClassLoader::_sync_JVMFindLoadedClassLockFreeCounter = NULL;
PerfCounter* ClassLoader::_sync_JVMDefineClassLockFreeCounter = NULL;
PerfCounter* ClassLoader::_sync_JNIDefineClassLockFreeCounter = NULL;
PerfCounter* ClassLoader::_unsafe_defineClassCallCounter = NULL;
PerfCounter* ClassLoader::_isUnsyncloadClass = NULL;
PerfCounter* ClassLoader::_load_instance_class_failCounter = NULL;
ClassPathEntry* ClassLoader::_first_entry = NULL;
ClassPathEntry* ClassLoader::_last_entry = NULL;
PackageHashtable* ClassLoader::_package_hash_table = NULL;
// helper routines
bool string_starts_with(const char* str, const char* str_to_find) {
size_t str_len = strlen(str);
size_t str_to_find_len = strlen(str_to_find);
if (str_to_find_len > str_len) {
return false;
}
return (strncmp(str, str_to_find, str_to_find_len) == 0);
}
bool string_ends_with(const char* str, const char* str_to_find) {
size_t str_len = strlen(str);
size_t str_to_find_len = strlen(str_to_find);
if (str_to_find_len > str_len) {
return false;
}
return (strncmp(str + (str_len - str_to_find_len), str_to_find, str_to_find_len) == 0);
}
MetaIndex::MetaIndex(char** meta_package_names, int num_meta_package_names) {
if (num_meta_package_names == 0) {
_meta_package_names = NULL;
_num_meta_package_names = 0;
} else {
_meta_package_names = NEW_C_HEAP_ARRAY(char*, num_meta_package_names);
_num_meta_package_names = num_meta_package_names;
memcpy(_meta_package_names, meta_package_names, num_meta_package_names * sizeof(char*));
}
}
MetaIndex::~MetaIndex() {
FREE_C_HEAP_ARRAY(char*, _meta_package_names);
}
bool MetaIndex::may_contain(const char* class_name) {
if ( _num_meta_package_names == 0) {
return false;
}
size_t class_name_len = strlen(class_name);
for (int i = 0; i < _num_meta_package_names; i++) {
char* pkg = _meta_package_names[i];
size_t pkg_len = strlen(pkg);
size_t min_len = MIN2(class_name_len, pkg_len);
if (!strncmp(class_name, pkg, min_len)) {
return true;
}
}
return false;
}
ClassPathEntry::ClassPathEntry() {
set_next(NULL);
}
bool ClassPathEntry::is_lazy() {
return false;
}
ClassPathDirEntry::ClassPathDirEntry(char* dir) : ClassPathEntry() {
_dir = NEW_C_HEAP_ARRAY(char, strlen(dir)+1);
strcpy(_dir, dir);
}
ClassFileStream* ClassPathDirEntry::open_stream(const char* name) {
// construct full path name
char path[JVM_MAXPATHLEN];
if (jio_snprintf(path, sizeof(path), "%s%s%s", _dir, os::file_separator(), name) == -1) {
return NULL;
}
// check if file exists
struct stat st;
if (os::stat(path, &st) == 0) {
// found file, open it
int file_handle = hpi::open(path, 0, 0);
if (file_handle != -1) {
// read contents into resource array
u1* buffer = NEW_RESOURCE_ARRAY(u1, st.st_size);
size_t num_read = os::read(file_handle, (char*) buffer, st.st_size);
// close file
hpi::close(file_handle);
// construct ClassFileStream
if (num_read == (size_t)st.st_size) {
return new ClassFileStream(buffer, st.st_size, _dir); // Resource allocated
}
}
}
return NULL;
}
ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name) : ClassPathEntry() {
_zip = zip;
_zip_name = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1);
strcpy(_zip_name, zip_name);
}
ClassPathZipEntry::~ClassPathZipEntry() {
if (ZipClose != NULL) {
(*ZipClose)(_zip);
}
FREE_C_HEAP_ARRAY(char, _zip_name);
}
ClassFileStream* ClassPathZipEntry::open_stream(const char* name) {
// enable call to C land
JavaThread* thread = JavaThread::current();
ThreadToNativeFromVM ttn(thread);
// check whether zip archive contains name
jint filesize, name_len;
jzentry* entry = (*FindEntry)(_zip, name, &filesize, &name_len);
if (entry == NULL) return NULL;
u1* buffer;
char name_buf[128];
char* filename;
if (name_len < 128) {
filename = name_buf;
} else {
filename = NEW_RESOURCE_ARRAY(char, name_len + 1);
}
// file found, get pointer to class in mmaped jar file.
if (ReadMappedEntry == NULL ||
!(*ReadMappedEntry)(_zip, entry, &buffer, filename)) {
// mmaped access not available, perhaps due to compression,
// read contents into resource array
buffer = NEW_RESOURCE_ARRAY(u1, filesize);
if (!(*ReadEntry)(_zip, entry, buffer, filename)) return NULL;
}
// return result
return new ClassFileStream(buffer, filesize, _zip_name); // Resource allocated
}
// invoke function for each entry in the zip file
void ClassPathZipEntry::contents_do(void f(const char* name, void* context), void* context) {
JavaThread* thread = JavaThread::current();
HandleMark handle_mark(thread);
ThreadToNativeFromVM ttn(thread);
for (int n = 0; ; n++) {
jzentry * ze = ((*GetNextEntry)(_zip, n));
if (ze == NULL) break;
(*f)(ze->name, context);
}
}
LazyClassPathEntry::LazyClassPathEntry(char* path, struct stat st) : ClassPathEntry() {
_path = strdup(path);
_st = st;
_meta_index = NULL;
_resolved_entry = NULL;
}
bool LazyClassPathEntry::is_jar_file() {
return ((_st.st_mode & S_IFREG) == S_IFREG);
}
ClassPathEntry* LazyClassPathEntry::resolve_entry() {
if (_resolved_entry != NULL) {
return (ClassPathEntry*) _resolved_entry;
}
ClassPathEntry* new_entry = NULL;
ClassLoader::create_class_path_entry(_path, _st, &new_entry, false);
assert(new_entry != NULL, "earlier code should have caught this");
{
ThreadCritical tc;
if (_resolved_entry == NULL) {
_resolved_entry = new_entry;
return new_entry;
}
}
assert(_resolved_entry != NULL, "bug in MT-safe resolution logic");
delete new_entry;
return (ClassPathEntry*) _resolved_entry;
}
ClassFileStream* LazyClassPathEntry::open_stream(const char* name) {
if (_meta_index != NULL &&
!_meta_index->may_contain(name)) {
return NULL;
}
return resolve_entry()->open_stream(name);
}
bool LazyClassPathEntry::is_lazy() {
return true;
}
static void print_meta_index(LazyClassPathEntry* entry,
GrowableArray<char*>& meta_packages) {
tty->print("[Meta index for %s=", entry->name());
for (int i = 0; i < meta_packages.length(); i++) {
if (i > 0) tty->print(" ");
tty->print(meta_packages.at(i));
}
tty->print_cr("]");
}
void ClassLoader::setup_meta_index() {
// Set up meta index which allows us to open boot jars lazily if
// class data sharing is enabled
const char* known_version = "% VERSION 2";
char* meta_index_path = Arguments::get_meta_index_path();
char* meta_index_dir = Arguments::get_meta_index_dir();
FILE* file = fopen(meta_index_path, "r");
int line_no = 0;
if (file != NULL) {
ResourceMark rm;
LazyClassPathEntry* cur_entry = NULL;
GrowableArray<char*> boot_class_path_packages(10);
char package_name[256];
bool skipCurrentJar = false;
while (fgets(package_name, sizeof(package_name), file) != NULL) {
++line_no;
// Remove trailing newline
package_name[strlen(package_name) - 1] = '\0';
switch(package_name[0]) {
case '%':
{
if ((line_no == 1) && (strcmp(package_name, known_version) != 0)) {
if (TraceClassLoading && Verbose) {
tty->print("[Unsupported meta index version]");
}
fclose(file);
return;
}
}
// These directives indicate jar files which contain only
// classes, only non-classfile resources, or a combination of
// the two. See src/share/classes/sun/misc/MetaIndex.java and
// make/tools/MetaIndex/BuildMetaIndex.java in the J2SE
// workspace.
case '#':
case '!':
case '@':
{
// Hand off current packages to current lazy entry (if any)
if ((cur_entry != NULL) &&
(boot_class_path_packages.length() > 0)) {
if (TraceClassLoading && Verbose) {
print_meta_index(cur_entry, boot_class_path_packages);
}
MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0),
boot_class_path_packages.length());
cur_entry->set_meta_index(index);
}
cur_entry = NULL;
boot_class_path_packages.clear();
// Find lazy entry corresponding to this jar file
for (ClassPathEntry* entry = _first_entry; entry != NULL; entry = entry->next()) {
if (entry->is_lazy() &&
string_starts_with(entry->name(), meta_index_dir) &&
string_ends_with(entry->name(), &package_name[2])) {
cur_entry = (LazyClassPathEntry*) entry;
break;
}
}
// If the first character is '@', it indicates the following jar
// file is a resource only jar file in which case, we should skip
// reading the subsequent entries since the resource loading is
// totally handled by J2SE side.
if (package_name[0] == '@') {
if (cur_entry != NULL) {
cur_entry->set_meta_index(new MetaIndex(NULL, 0));
}
cur_entry = NULL;
skipCurrentJar = true;
} else {
skipCurrentJar = false;
}
break;
}
default:
{
if (!skipCurrentJar && cur_entry != NULL) {
char* new_name = strdup(package_name);
boot_class_path_packages.append(new_name);
}
}
}
}
// Hand off current packages to current lazy entry (if any)
if ((cur_entry != NULL) &&
(boot_class_path_packages.length() > 0)) {
if (TraceClassLoading && Verbose) {
print_meta_index(cur_entry, boot_class_path_packages);
}
MetaIndex* index = new MetaIndex(boot_class_path_packages.adr_at(0),
boot_class_path_packages.length());
cur_entry->set_meta_index(index);
}
fclose(file);
}
}
void ClassLoader::setup_bootstrap_search_path() {
assert(_first_entry == NULL, "should not setup bootstrap class search path twice");
char* sys_class_path = os::strdup(Arguments::get_sysclasspath());
if (TraceClassLoading && Verbose) {
tty->print_cr("[Bootstrap loader class path=%s]", sys_class_path);
}
int len = (int)strlen(sys_class_path);
int end = 0;
// Iterate over class path entries
for (int start = 0; start < len; start = end) {
while (sys_class_path[end] && sys_class_path[end] != os::path_separator()[0]) {
end++;
}
char* path = NEW_C_HEAP_ARRAY(char, end-start+1);
strncpy(path, &sys_class_path[start], end-start);
path[end-start] = '\0';
update_class_path_entry_list(path, false);
FREE_C_HEAP_ARRAY(char, path);
while (sys_class_path[end] == os::path_separator()[0]) {
end++;
}
}
}
void ClassLoader::create_class_path_entry(char *path, struct stat st, ClassPathEntry **new_entry, bool lazy) {
JavaThread* thread = JavaThread::current();
if (lazy) {
*new_entry = new LazyClassPathEntry(path, st);
return;
}
if ((st.st_mode & S_IFREG) == S_IFREG) {
// Regular file, should be a zip file
// Canonicalized filename
char canonical_path[JVM_MAXPATHLEN];
if (!get_canonical_path(path, canonical_path, JVM_MAXPATHLEN)) {
// This matches the classic VM
EXCEPTION_MARK;
THROW_MSG(vmSymbols::java_io_IOException(), "Bad pathname");
}
char* error_msg = NULL;
jzfile* zip;
{
// enable call to C land
ThreadToNativeFromVM ttn(thread);
HandleMark hm(thread);
zip = (*ZipOpen)(canonical_path, &error_msg);
}
if (zip != NULL && error_msg == NULL) {
*new_entry = new ClassPathZipEntry(zip, path);
if (TraceClassLoading) {
tty->print_cr("[Opened %s]", path);
}
} else {
ResourceMark rm(thread);
char *msg;
if (error_msg == NULL) {
msg = NEW_RESOURCE_ARRAY(char, strlen(path) + 128); ;
jio_snprintf(msg, strlen(path) + 127, "error in opening JAR file %s", path);
} else {
int len = (int)(strlen(path) + strlen(error_msg) + 128);
msg = NEW_RESOURCE_ARRAY(char, len); ;
jio_snprintf(msg, len - 1, "error in opening JAR file <%s> %s", error_msg, path);
}
EXCEPTION_MARK;
THROW_MSG(vmSymbols::java_lang_ClassNotFoundException(), msg);
}
} else {
// Directory
*new_entry = new ClassPathDirEntry(path);
if (TraceClassLoading) {
tty->print_cr("[Path %s]", path);
}
}
}
// Create a class path zip entry for a given path (return NULL if not found
// or zip/JAR file cannot be opened)
ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path) {
// check for a regular file
struct stat st;
if (os::stat(path, &st) == 0) {
if ((st.st_mode & S_IFREG) == S_IFREG) {
char orig_path[JVM_MAXPATHLEN];
char canonical_path[JVM_MAXPATHLEN];
strcpy(orig_path, path);
if (get_canonical_path(orig_path, canonical_path, JVM_MAXPATHLEN)) {
char* error_msg = NULL;
jzfile* zip;
{
// enable call to C land
JavaThread* thread = JavaThread::current();
ThreadToNativeFromVM ttn(thread);
HandleMark hm(thread);
zip = (*ZipOpen)(canonical_path, &error_msg);
}
if (zip != NULL && error_msg == NULL) {
// create using canonical path
return new ClassPathZipEntry(zip, canonical_path);
}
}
}
}
return NULL;
}
// returns true if entry already on class path
bool ClassLoader::contains_entry(ClassPathEntry *entry) {
ClassPathEntry* e = _first_entry;
while (e != NULL) {
// assume zip entries have been canonicalized
if (strcmp(entry->name(), e->name()) == 0) {
return true;
}
e = e->next();
}
return false;
}
void ClassLoader::add_to_list(ClassPathEntry *new_entry) {
if (new_entry != NULL) {
if (_last_entry == NULL) {
_first_entry = _last_entry = new_entry;
} else {
_last_entry->set_next(new_entry);
_last_entry = new_entry;
}
}
}
void ClassLoader::update_class_path_entry_list(const char *path,
bool check_for_duplicates) {
struct stat st;
if (os::stat((char *)path, &st) == 0) {
// File or directory found
ClassPathEntry* new_entry = NULL;
create_class_path_entry((char *)path, st, &new_entry, LazyBootClassLoader);
// The kernel VM adds dynamically to the end of the classloader path and
// doesn't reorder the bootclasspath which would break java.lang.Package
// (see PackageInfo).
// Add new entry to linked list
if (!check_for_duplicates || !contains_entry(new_entry)) {
add_to_list(new_entry);
}
}
}
void ClassLoader::print_bootclasspath() {
ClassPathEntry* e = _first_entry;
tty->print("[bootclasspath= ");
while (e != NULL) {
tty->print("%s ;", e->name());
e = e->next();
}
tty->print_cr("]");
}
void ClassLoader::load_zip_library() {
assert(ZipOpen == NULL, "should not load zip library twice");
// First make sure native library is loaded
os::native_java_library();
// Load zip library
char path[JVM_MAXPATHLEN];
char ebuf[1024];
hpi::dll_build_name(path, sizeof(path), Arguments::get_dll_dir(), "zip");
void* handle = hpi::dll_load(path, ebuf, sizeof ebuf);
if (handle == NULL) {
vm_exit_during_initialization("Unable to load ZIP library", path);
}
// Lookup zip entry points
ZipOpen = CAST_TO_FN_PTR(ZipOpen_t, hpi::dll_lookup(handle, "ZIP_Open"));
ZipClose = CAST_TO_FN_PTR(ZipClose_t, hpi::dll_lookup(handle, "ZIP_Close"));
FindEntry = CAST_TO_FN_PTR(FindEntry_t, hpi::dll_lookup(handle, "ZIP_FindEntry"));
ReadEntry = CAST_TO_FN_PTR(ReadEntry_t, hpi::dll_lookup(handle, "ZIP_ReadEntry"));
ReadMappedEntry = CAST_TO_FN_PTR(ReadMappedEntry_t, hpi::dll_lookup(handle, "ZIP_ReadMappedEntry"));
GetNextEntry = CAST_TO_FN_PTR(GetNextEntry_t, hpi::dll_lookup(handle, "ZIP_GetNextEntry"));
// ZIP_Close is not exported on Windows in JDK5.0 so don't abort if ZIP_Close is NULL
if (ZipOpen == NULL || FindEntry == NULL || ReadEntry == NULL || GetNextEntry == NULL) {
vm_exit_during_initialization("Corrupted ZIP library", path);
}
// Lookup canonicalize entry in libjava.dll
void *javalib_handle = os::native_java_library();
CanonicalizeEntry = CAST_TO_FN_PTR(canonicalize_fn_t, hpi::dll_lookup(javalib_handle, "Canonicalize"));
// This lookup only works on 1.3. Do not check for non-null here
}
// PackageInfo data exists in order to support the java.lang.Package
// class. A Package object provides information about a java package
// (version, vendor, etc.) which originates in the manifest of the jar
// file supplying the package. For application classes, the ClassLoader
// object takes care of this.
// For system (boot) classes, the Java code in the Package class needs
// to be able to identify which source jar file contained the boot
// class, so that it can extract the manifest from it. This table
// identifies java packages with jar files in the boot classpath.
// Because the boot classpath cannot change, the classpath index is
// sufficient to identify the source jar file or directory. (Since
// directories have no manifests, the directory name is not required,
// but is available.)
// When using sharing -- the pathnames of entries in the boot classpath
// may not be the same at runtime as they were when the archive was
// created (NFS, Samba, etc.). The actual files and directories named
// in the classpath must be the same files, in the same order, even
// though the exact name is not the same.
class PackageInfo: public BasicHashtableEntry {
public:
const char* _pkgname; // Package name
int _classpath_index; // Index of directory or JAR file loaded from
PackageInfo* next() {
return (PackageInfo*)BasicHashtableEntry::next();
}
const char* pkgname() { return _pkgname; }
void set_pkgname(char* pkgname) { _pkgname = pkgname; }
const char* filename() {
return ClassLoader::classpath_entry(_classpath_index)->name();
}
void set_index(int index) {
_classpath_index = index;
}
};
class PackageHashtable : public BasicHashtable {
private:
inline unsigned int compute_hash(const char *s, int n) {
unsigned int val = 0;
while (--n >= 0) {
val = *s++ + 31 * val;
}
return val;
}
PackageInfo* bucket(int index) {
return (PackageInfo*)BasicHashtable::bucket(index);
}
PackageInfo* get_entry(int index, unsigned int hash,
const char* pkgname, size_t n) {
for (PackageInfo* pp = bucket(index); pp != NULL; pp = pp->next()) {
if (pp->hash() == hash &&
strncmp(pkgname, pp->pkgname(), n) == 0 &&
pp->pkgname()[n] == '\0') {
return pp;
}
}
return NULL;
}
public:
PackageHashtable(int table_size)
: BasicHashtable(table_size, sizeof(PackageInfo)) {}
PackageHashtable(int table_size, HashtableBucket* t, int number_of_entries)
: BasicHashtable(table_size, sizeof(PackageInfo), t, number_of_entries) {}
PackageInfo* get_entry(const char* pkgname, int n) {
unsigned int hash = compute_hash(pkgname, n);
return get_entry(hash_to_index(hash), hash, pkgname, n);
}
PackageInfo* new_entry(char* pkgname, int n) {
unsigned int hash = compute_hash(pkgname, n);
PackageInfo* pp;
pp = (PackageInfo*)BasicHashtable::new_entry(hash);
pp->set_pkgname(pkgname);
return pp;
}
void add_entry(PackageInfo* pp) {
int index = hash_to_index(pp->hash());
BasicHashtable::add_entry(index, pp);
}
void copy_pkgnames(const char** packages) {
int n = 0;
for (int i = 0; i < table_size(); ++i) {
for (PackageInfo* pp = bucket(i); pp != NULL; pp = pp->next()) {
packages[n++] = pp->pkgname();
}
}
assert(n == number_of_entries(), "just checking");
}
void copy_table(char** top, char* end, PackageHashtable* table);
};
void PackageHashtable::copy_table(char** top, char* end,
PackageHashtable* table) {
// Copy (relocate) the table to the shared space.
BasicHashtable::copy_table(top, end);
// Calculate the space needed for the package name strings.
int i;
int n = 0;
for (i = 0; i < table_size(); ++i) {
for (PackageInfo* pp = table->bucket(i);
pp != NULL;
pp = pp->next()) {
n += (int)(strlen(pp->pkgname()) + 1);
}
}
if (*top + n + sizeof(intptr_t) >= end) {
warning("\nThe shared miscellaneous data space is not large "
"enough to \npreload requested classes. Use "
"-XX:SharedMiscDataSize= to increase \nthe initial "
"size of the miscellaneous data space.\n");
exit(2);
}
// Copy the table data (the strings) to the shared space.
n = align_size_up(n, sizeof(HeapWord));
*(intptr_t*)(*top) = n;
*top += sizeof(intptr_t);
for (i = 0; i < table_size(); ++i) {
for (PackageInfo* pp = table->bucket(i);
pp != NULL;
pp = pp->next()) {
int n1 = (int)(strlen(pp->pkgname()) + 1);
pp->set_pkgname((char*)memcpy(*top, pp->pkgname(), n1));
*top += n1;
}
}
*top = (char*)align_size_up((intptr_t)*top, sizeof(HeapWord));
}
void ClassLoader::copy_package_info_buckets(char** top, char* end) {
_package_hash_table->copy_buckets(top, end);
}
void ClassLoader::copy_package_info_table(char** top, char* end) {
_package_hash_table->copy_table(top, end, _package_hash_table);
}
PackageInfo* ClassLoader::lookup_package(const char *pkgname) {
const char *cp = strrchr(pkgname, '/');
if (cp != NULL) {
// Package prefix found
int n = cp - pkgname + 1;
return _package_hash_table->get_entry(pkgname, n);
}
return NULL;
}
bool ClassLoader::add_package(const char *pkgname, int classpath_index, TRAPS) {
assert(pkgname != NULL, "just checking");
// Bootstrap loader no longer holds system loader lock obj serializing
// load_instance_class and thereby add_package
{
MutexLocker ml(PackageTable_lock, THREAD);
// First check for previously loaded entry
PackageInfo* pp = lookup_package(pkgname);
if (pp != NULL) {
// Existing entry found, check source of package
pp->set_index(classpath_index);
return true;
}
const char *cp = strrchr(pkgname, '/');
if (cp != NULL) {
// Package prefix found
int n = cp - pkgname + 1;
char* new_pkgname = NEW_C_HEAP_ARRAY(char, n + 1);
if (new_pkgname == NULL) {
return false;
}
memcpy(new_pkgname, pkgname, n);
new_pkgname[n] = '\0';
pp = _package_hash_table->new_entry(new_pkgname, n);
pp->set_index(classpath_index);
// Insert into hash table
_package_hash_table->add_entry(pp);
}
return true;
}
}
oop ClassLoader::get_system_package(const char* name, TRAPS) {
PackageInfo* pp;
{
MutexLocker ml(PackageTable_lock, THREAD);
pp = lookup_package(name);
}
if (pp == NULL) {
return NULL;
} else {
Handle p = java_lang_String::create_from_str(pp->filename(), THREAD);
return p();
}
}
objArrayOop ClassLoader::get_system_packages(TRAPS) {
ResourceMark rm(THREAD);
int nof_entries;
const char** packages;
{
MutexLocker ml(PackageTable_lock, THREAD);
// Allocate resource char* array containing package names
nof_entries = _package_hash_table->number_of_entries();
if ((packages = NEW_RESOURCE_ARRAY(const char*, nof_entries)) == NULL) {
return NULL;
}
_package_hash_table->copy_pkgnames(packages);
}
// Allocate objArray and fill with java.lang.String
objArrayOop r = oopFactory::new_objArray(SystemDictionary::string_klass(),
nof_entries, CHECK_0);
objArrayHandle result(THREAD, r);
for (int i = 0; i < nof_entries; i++) {
Handle str = java_lang_String::create_from_str(packages[i], CHECK_0);
result->obj_at_put(i, str());
}
return result();
}
instanceKlassHandle ClassLoader::load_classfile(symbolHandle h_name, TRAPS) {
VTuneClassLoadMarker clm;
ResourceMark rm(THREAD);
EventMark m("loading class " INTPTR_FORMAT, (address)h_name());
ThreadProfilerMark tpm(ThreadProfilerMark::classLoaderRegion);
stringStream st;
// st.print() uses too much stack space while handling a StackOverflowError
// st.print("%s.class", h_name->as_utf8());
st.print_raw(h_name->as_utf8());
st.print_raw(".class");
char* name = st.as_string();
// Lookup stream for parsing .class file
ClassFileStream* stream = NULL;
int classpath_index = 0;
{
PerfTraceTime vmtimer(perf_accumulated_time());
ClassPathEntry* e = _first_entry;
while (e != NULL) {
stream = e->open_stream(name);
if (stream != NULL) {
break;
}
e = e->next();
++classpath_index;
}
}
instanceKlassHandle h(THREAD, klassOop(NULL));
if (stream != NULL) {
// class file found, parse it
ClassFileParser parser(stream);
Handle class_loader;
Handle protection_domain;
symbolHandle parsed_name;
instanceKlassHandle result = parser.parseClassFile(h_name,
class_loader,
protection_domain,
parsed_name,
CHECK_(h));
// add to package table
if (add_package(name, classpath_index, THREAD)) {
h = result;
}
}
return h;
}
void ClassLoader::create_package_info_table(HashtableBucket *t, int length,
int number_of_entries) {
assert(_package_hash_table == NULL, "One package info table allowed.");
assert(length == package_hash_table_size * sizeof(HashtableBucket),
"bad shared package info size.");
_package_hash_table = new PackageHashtable(package_hash_table_size, t,
number_of_entries);
}
void ClassLoader::create_package_info_table() {
assert(_package_hash_table == NULL, "shouldn't have one yet");
_package_hash_table = new PackageHashtable(package_hash_table_size);
}
// Initialize the class loader's access to methods in libzip. Parse and
// process the boot classpath into a list ClassPathEntry objects. Once
// this list has been created, it must not change order (see class PackageInfo)
// it can be appended to and is by jvmti and the kernel vm.
void ClassLoader::initialize() {
assert(_package_hash_table == NULL, "should have been initialized by now.");
EXCEPTION_MARK;
if (UsePerfData) {
// jvmstat performance counters
NEWPERFTICKCOUNTER(_perf_accumulated_time, SUN_CLS, "time");
NEWPERFTICKCOUNTER(_perf_class_init_time, SUN_CLS, "classInitTime");
NEWPERFTICKCOUNTER(_perf_class_verify_time, SUN_CLS, "classVerifyTime");
NEWPERFTICKCOUNTER(_perf_class_link_time, SUN_CLS, "classLinkedTime");
NEWPERFEVENTCOUNTER(_perf_classes_inited, SUN_CLS, "initializedClasses");
NEWPERFEVENTCOUNTER(_perf_classes_linked, SUN_CLS, "linkedClasses");
// The following performance counters are added for measuring the impact
// of the bug fix of 6365597. They are mainly focused on finding out
// the behavior of system & user-defined classloader lock, whether
// ClassLoader.loadClass/findClass is being called synchronized or not.
// Also two additional counters are created to see whether 'UnsyncloadClass'
// flag is being set or not and how many times load_instance_class call
// fails with linkageError etc.
NEWPERFEVENTCOUNTER(_sync_systemLoaderLockContentionRate, SUN_CLS,
"systemLoaderLockContentionRate");
NEWPERFEVENTCOUNTER(_sync_nonSystemLoaderLockContentionRate, SUN_CLS,
"nonSystemLoaderLockContentionRate");
NEWPERFEVENTCOUNTER(_sync_JVMFindLoadedClassLockFreeCounter, SUN_CLS,
"jvmFindLoadedClassNoLockCalls");
NEWPERFEVENTCOUNTER(_sync_JVMDefineClassLockFreeCounter, SUN_CLS,
"jvmDefineClassNoLockCalls");
NEWPERFEVENTCOUNTER(_sync_JNIDefineClassLockFreeCounter, SUN_CLS,
"jniDefineClassNoLockCalls");
NEWPERFEVENTCOUNTER(_unsafe_defineClassCallCounter, SUN_CLS,
"unsafeDefineClassCalls");
NEWPERFEVENTCOUNTER(_isUnsyncloadClass, SUN_CLS, "isUnsyncloadClassSet");
NEWPERFEVENTCOUNTER(_load_instance_class_failCounter, SUN_CLS,
"loadInstanceClassFailRate");
// increment the isUnsyncloadClass counter if UnsyncloadClass is set.
if (UnsyncloadClass) {
_isUnsyncloadClass->inc();
}
}
// lookup zip library entry points
load_zip_library();
// initialize search path
setup_bootstrap_search_path();
if (LazyBootClassLoader) {
// set up meta index which makes boot classpath initialization lazier
setup_meta_index();
}
}
jlong ClassLoader::classloader_time_ms() {
return UsePerfData ?
Management::ticks_to_ms(_perf_accumulated_time->get_value()) : -1;
}
jlong ClassLoader::class_init_count() {
return UsePerfData ? _perf_classes_inited->get_value() : -1;
}
jlong ClassLoader::class_init_time_ms() {
return UsePerfData ?
Management::ticks_to_ms(_perf_class_init_time->get_value()) : -1;
}
jlong ClassLoader::class_verify_time_ms() {
return UsePerfData ?
Management::ticks_to_ms(_perf_class_verify_time->get_value()) : -1;
}
jlong ClassLoader::class_link_count() {
return UsePerfData ? _perf_classes_linked->get_value() : -1;
}
jlong ClassLoader::class_link_time_ms() {
return UsePerfData ?
Management::ticks_to_ms(_perf_class_link_time->get_value()) : -1;
}
int ClassLoader::compute_Object_vtable() {
// hardwired for JDK1.2 -- would need to duplicate class file parsing
// code to determine actual value from file
// Would be value '11' if finals were in vtable
int JDK_1_2_Object_vtable_size = 5;
return JDK_1_2_Object_vtable_size * vtableEntry::size();
}
void classLoader_init() {
ClassLoader::initialize();
}
bool ClassLoader::get_canonical_path(char* orig, char* out, int len) {
assert(orig != NULL && out != NULL && len > 0, "bad arguments");
if (CanonicalizeEntry != NULL) {
JNIEnv* env = JavaThread::current()->jni_environment();
if ((CanonicalizeEntry)(env, hpi::native_path(orig), out, len) < 0) {
return false;
}
} else {
// On JDK 1.2.2 the Canonicalize does not exist, so just do nothing
strncpy(out, orig, len);
out[len - 1] = '\0';
}
return true;
}
#ifndef PRODUCT
void ClassLoader::verify() {
_package_hash_table->verify();
}
// CompileTheWorld
//
// Iterates over all class path entries and forces compilation of all methods
// in all classes found. Currently, only zip/jar archives are searched.
//
// The classes are loaded by the Java level bootstrap class loader, and the
// initializer is called. If DelayCompilationDuringStartup is true (default),
// the interpreter will run the initialization code. Note that forcing
// initialization in this way could potentially lead to initialization order
// problems, in which case we could just force the initialization bit to be set.
// We need to iterate over the contents of a zip/jar file, so we replicate the
// jzcell and jzfile definitions from zip_util.h but rename jzfile to real_jzfile,
// since jzfile already has a void* definition.
//
// Note that this is only used in debug mode.
//
// HotSpot integration note:
// Matches zip_util.h 1.14 99/06/01 from jdk1.3 beta H build
// JDK 1.3 version
typedef struct real_jzentry13 { /* Zip file entry */
char *name; /* entry name */
jint time; /* modification time */
jint size; /* size of uncompressed data */
jint csize; /* size of compressed data (zero if uncompressed) */
jint crc; /* crc of uncompressed data */
char *comment; /* optional zip file comment */
jbyte *extra; /* optional extra data */
jint pos; /* position of LOC header (if negative) or data */
} real_jzentry13;
typedef struct real_jzfile13 { /* Zip file */
char *name; /* zip file name */
jint refs; /* number of active references */
jint fd; /* open file descriptor */
void *lock; /* read lock */
char *comment; /* zip file comment */
char *msg; /* zip error message */
void *entries; /* array of hash cells */
jint total; /* total number of entries */
unsigned short *table; /* Hash chain heads: indexes into entries */
jint tablelen; /* number of hash eads */
real_jzfile13 *next; /* next zip file in search list */
jzentry *cache; /* we cache the most recently freed jzentry */
/* Information on metadata names in META-INF directory */
char **metanames; /* array of meta names (may have null names) */
jint metacount; /* number of slots in metanames array */
/* If there are any per-entry comments, they are in the comments array */
char **comments;
} real_jzfile13;
// JDK 1.2 version
typedef struct real_jzentry12 { /* Zip file entry */
char *name; /* entry name */
jint time; /* modification time */
jint size; /* size of uncompressed data */
jint csize; /* size of compressed data (zero if uncompressed) */
jint crc; /* crc of uncompressed data */
char *comment; /* optional zip file comment */
jbyte *extra; /* optional extra data */
jint pos; /* position of LOC header (if negative) or data */
struct real_jzentry12 *next; /* next entry in hash table */
} real_jzentry12;
typedef struct real_jzfile12 { /* Zip file */
char *name; /* zip file name */
jint refs; /* number of active references */
jint fd; /* open file descriptor */
void *lock; /* read lock */
char *comment; /* zip file comment */
char *msg; /* zip error message */
real_jzentry12 *entries; /* array of zip entries */
jint total; /* total number of entries */
real_jzentry12 **table; /* hash table of entries */
jint tablelen; /* number of buckets */
jzfile *next; /* next zip file in search list */
} real_jzfile12;
void ClassPathDirEntry::compile_the_world(Handle loader, TRAPS) {
// For now we only compile all methods in all classes in zip/jar files
tty->print_cr("CompileTheWorld : Skipped classes in %s", _dir);
tty->cr();
}
bool ClassPathDirEntry::is_rt_jar() {
return false;
}
void ClassPathZipEntry::compile_the_world(Handle loader, TRAPS) {
if (JDK_Version::is_jdk12x_version()) {
compile_the_world12(loader, THREAD);
} else {
compile_the_world13(loader, THREAD);
}
if (HAS_PENDING_EXCEPTION) {
if (PENDING_EXCEPTION->is_a(SystemDictionary::OutOfMemoryError_klass())) {
CLEAR_PENDING_EXCEPTION;
tty->print_cr("\nCompileTheWorld : Ran out of memory\n");
size_t used = Universe::heap()->permanent_used();
size_t capacity = Universe::heap()->permanent_capacity();
tty->print_cr("Permanent generation used %dK of %dK", used/K, capacity/K);
tty->print_cr("Increase size by setting e.g. -XX:MaxPermSize=%dK\n", capacity*2/K);
} else {
tty->print_cr("\nCompileTheWorld : Unexpected exception occurred\n");
}
}
}
// Version that works for JDK 1.3.x
void ClassPathZipEntry::compile_the_world13(Handle loader, TRAPS) {
real_jzfile13* zip = (real_jzfile13*) _zip;
tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
tty->cr();
// Iterate over all entries in zip file
for (int n = 0; ; n++) {
real_jzentry13 * ze = (real_jzentry13 *)((*GetNextEntry)(_zip, n));
if (ze == NULL) break;
ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
}
}
// Version that works for JDK 1.2.x
void ClassPathZipEntry::compile_the_world12(Handle loader, TRAPS) {
real_jzfile12* zip = (real_jzfile12*) _zip;
tty->print_cr("CompileTheWorld : Compiling all classes in %s", zip->name);
tty->cr();
// Iterate over all entries in zip file
for (int n = 0; ; n++) {
real_jzentry12 * ze = (real_jzentry12 *)((*GetNextEntry)(_zip, n));
if (ze == NULL) break;
ClassLoader::compile_the_world_in(ze->name, loader, CHECK);
}
}
bool ClassPathZipEntry::is_rt_jar() {
if (JDK_Version::is_jdk12x_version()) {
return is_rt_jar12();
} else {
return is_rt_jar13();
}
}
// JDK 1.3 version
bool ClassPathZipEntry::is_rt_jar13() {
real_jzfile13* zip = (real_jzfile13*) _zip;
int len = (int)strlen(zip->name);
// Check whether zip name ends in "rt.jar"
// This will match other archives named rt.jar as well, but this is
// only used for debugging.
return (len >= 6) && (strcasecmp(zip->name + len - 6, "rt.jar") == 0);
}
// JDK 1.2 version
bool ClassPathZipEntry::is_rt_jar12() {
real_jzfile12* zip = (real_jzfile12*) _zip;
int len = (int)strlen(zip->name);
// Check whether zip name ends in "rt.jar"
// This will match other archives named rt.jar as well, but this is
// only used for debugging.
return (len >= 6) && (strcasecmp(zip->name + len - 6, "rt.jar") == 0);
}
void LazyClassPathEntry::compile_the_world(Handle loader, TRAPS) {
resolve_entry()->compile_the_world(loader, CHECK);
}
bool LazyClassPathEntry::is_rt_jar() {
return resolve_entry()->is_rt_jar();
}
void ClassLoader::compile_the_world() {
EXCEPTION_MARK;
HandleMark hm(THREAD);
ResourceMark rm(THREAD);
// Make sure we don't run with background compilation
BackgroundCompilation = false;
// Find bootstrap loader
Handle system_class_loader (THREAD, SystemDictionary::java_system_loader());
// Iterate over all bootstrap class path entries
ClassPathEntry* e = _first_entry;
while (e != NULL) {
// We stop at rt.jar, unless it is the first bootstrap path entry
if (e->is_rt_jar() && e != _first_entry) break;
e->compile_the_world(system_class_loader, CATCH);
e = e->next();
}
tty->print_cr("CompileTheWorld : Done");
{
// Print statistics as if before normal exit:
extern void print_statistics();
print_statistics();
}
vm_exit(0);
}
int ClassLoader::_compile_the_world_counter = 0;
void ClassLoader::compile_the_world_in(char* name, Handle loader, TRAPS) {
int len = (int)strlen(name);
if (len > 6 && strcmp(".class", name + len - 6) == 0) {
// We have a .class file
char buffer[2048];
strncpy(buffer, name, len - 6);
buffer[len-6] = 0;
// If the file has a period after removing .class, it's not really a
// valid class file. The class loader will check everything else.
if (strchr(buffer, '.') == NULL) {
_compile_the_world_counter++;
6741757: minor ctw improvements Reviewed-by: kvn
2009-04-16 21:25:29 -07:00
if (_compile_the_world_counter > CompileTheWorldStopAt) return;
// Construct name without extension
symbolHandle sym = oopFactory::new_symbol_handle(buffer, CHECK);
// Use loader to load and initialize class
klassOop ik = SystemDictionary::resolve_or_null(sym, loader, Handle(), THREAD);
instanceKlassHandle k (THREAD, ik);
if (k.not_null() && !HAS_PENDING_EXCEPTION) {
k->initialize(THREAD);
}
bool exception_occurred = HAS_PENDING_EXCEPTION;
CLEAR_PENDING_EXCEPTION;
if (CompileTheWorldPreloadClasses && k.not_null()) {
constantPoolKlass::preload_and_initialize_all_classes(k->constants(), THREAD);
if (HAS_PENDING_EXCEPTION) {
// If something went wrong in preloading we just ignore it
CLEAR_PENDING_EXCEPTION;
tty->print_cr("Preloading failed for (%d) %s", _compile_the_world_counter, buffer);
Initial load
2007-12-01 00:00:00 +00:00
}
6741757: minor ctw improvements Reviewed-by: kvn
2009-04-16 21:25:29 -07:00
}
if (_compile_the_world_counter >= CompileTheWorldStartAt) {
Initial load
2007-12-01 00:00:00 +00:00
if (k.is_null() || (exception_occurred && !CompileTheWorldIgnoreInitErrors)) {
// If something went wrong (e.g. ExceptionInInitializerError) we skip this class
tty->print_cr("CompileTheWorld (%d) : Skipping %s", _compile_the_world_counter, buffer);
} else {
tty->print_cr("CompileTheWorld (%d) : %s", _compile_the_world_counter, buffer);
// Preload all classes to get around uncommon traps
// Iterate over all methods in class
for (int n = 0; n < k->methods()->length(); n++) {
methodHandle m (THREAD, methodOop(k->methods()->obj_at(n)));
if (CompilationPolicy::canBeCompiled(m)) {
// Force compilation
CompileBroker::compile_method(m, InvocationEntryBci,
methodHandle(), 0, "CTW", THREAD);
if (HAS_PENDING_EXCEPTION) {
CLEAR_PENDING_EXCEPTION;
tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_counter, m->name()->as_C_string());
}
6741757: minor ctw improvements Reviewed-by: kvn
2009-04-16 21:25:29 -07:00
if (TieredCompilation) {
// Clobber the first compile and force second tier compilation
nmethod* nm = m->code();
if (nm != NULL) {
// Throw out the code so that the code cache doesn't fill up
nm->make_not_entrant();
m->clear_code();
}
CompileBroker::compile_method(m, InvocationEntryBci,
methodHandle(), 0, "CTW", THREAD);
if (HAS_PENDING_EXCEPTION) {
CLEAR_PENDING_EXCEPTION;
tty->print_cr("CompileTheWorld (%d) : Skipping method: %s", _compile_the_world_counter, m->name()->as_C_string());
}
Initial load
2007-12-01 00:00:00 +00:00
}
}
6741757: minor ctw improvements Reviewed-by: kvn
2009-04-16 21:25:29 -07:00
nmethod* nm = m->code();
if (nm != NULL) {
// Throw out the code so that the code cache doesn't fill up
nm->make_not_entrant();
m->clear_code();
Initial load
2007-12-01 00:00:00 +00:00
}
}
}
}
}
}
}
#endif //PRODUCT
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