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8187443: Forest Consolidation: Move files to unified layout

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Reviewed-by: darcy, ihse
This commit is contained in:
Erik Joelsson 2017-09-12 19:03:39 +02:00
parent 270fe13182
commit 3789983e89
56923 changed files with 3 additions and 15727 deletions
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src/hotspot/share/classfile/classLoader.hpp Normal file
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/*
* Copyright (c) 1997, 2017, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#ifndef SHARE_VM_CLASSFILE_CLASSLOADER_HPP
#define SHARE_VM_CLASSFILE_CLASSLOADER_HPP
#include "classfile/jimage.hpp"
#include "runtime/orderAccess.hpp"
#include "runtime/perfData.hpp"
#include "utilities/exceptions.hpp"
#include "utilities/macros.hpp"
// The VM class loader.
#include <sys/stat.h>
// Name of boot "modules" image
#define MODULES_IMAGE_NAME "modules"
// Name of the resource containing mapping from module names to defining class loader type
#define MODULE_LOADER_MAP "jdk/internal/vm/cds/resources/ModuleLoaderMap.dat"
// Initial sizes of the following arrays are based on the generated ModuleLoaderMap.dat
#define INITIAL_BOOT_MODULES_ARRAY_SIZE 30
#define INITIAL_PLATFORM_MODULES_ARRAY_SIZE 15
// Class path entry (directory or zip file)
class JImageFile;
class ClassFileStream;
class PackageEntry;
class ClassPathEntry : public CHeapObj<mtClass> {
private:
ClassPathEntry* volatile _next;
public:
// Next entry in class path
ClassPathEntry* next() const {
return (ClassPathEntry*) OrderAccess::load_ptr_acquire(&_next);
}
virtual ~ClassPathEntry() {}
void set_next(ClassPathEntry* next) {
// may have unlocked readers, so ensure visibility.
OrderAccess::release_store_ptr(&_next, next);
}
virtual bool is_jrt() = 0;
virtual bool is_jar_file() const = 0;
virtual const char* name() const = 0;
virtual JImageFile* jimage() const = 0;
// Constructor
ClassPathEntry() : _next(NULL) {}
// Attempt to locate file_name through this class path entry.
// Returns a class file parsing stream if successfull.
virtual ClassFileStream* open_stream(const char* name, TRAPS) = 0;
// Debugging
NOT_PRODUCT(virtual void compile_the_world(Handle loader, TRAPS) = 0;)
};
class ClassPathDirEntry: public ClassPathEntry {
private:
const char* _dir; // Name of directory
public:
bool is_jrt() { return false; }
bool is_jar_file() const { return false; }
const char* name() const { return _dir; }
JImageFile* jimage() const { return NULL; }
ClassPathDirEntry(const char* dir);
virtual ~ClassPathDirEntry() {}
ClassFileStream* open_stream(const char* name, TRAPS);
// Debugging
NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
};
// Type definitions for zip file and zip file entry
typedef void* jzfile;
typedef struct {
char *name; /* entry name */
jlong time; /* modification time */
jlong size; /* size of uncompressed data */
jlong 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 */
jlong pos; /* position of LOC header (if negative) or data */
} jzentry;
class ClassPathZipEntry: public ClassPathEntry {
enum {
_unknown = 0,
_yes = 1,
_no = 2
};
private:
jzfile* _zip; // The zip archive
const char* _zip_name; // Name of zip archive
bool _is_boot_append; // entry coming from -Xbootclasspath/a
u1 _multi_versioned; // indicates if the jar file has multi-versioned entries.
// It can have value of "_unknown", "_yes", or "_no"
public:
bool is_jrt() { return false; }
bool is_jar_file() const { return true; }
const char* name() const { return _zip_name; }
JImageFile* jimage() const { return NULL; }
ClassPathZipEntry(jzfile* zip, const char* zip_name, bool is_boot_append);
virtual ~ClassPathZipEntry();
u1* open_entry(const char* name, jint* filesize, bool nul_terminate, TRAPS);
u1* open_versioned_entry(const char* name, jint* filesize, TRAPS) NOT_CDS_RETURN_(NULL);
ClassFileStream* open_stream(const char* name, TRAPS);
void contents_do(void f(const char* name, void* context), void* context);
bool is_multiple_versioned(TRAPS) NOT_CDS_RETURN_(false);
// Debugging
NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
};
// For java image files
class ClassPathImageEntry: public ClassPathEntry {
private:
JImageFile* _jimage;
const char* _name;
public:
bool is_jrt();
bool is_jar_file() const { return false; }
bool is_open() const { return _jimage != NULL; }
const char* name() const { return _name == NULL ? "" : _name; }
JImageFile* jimage() const { return _jimage; }
ClassPathImageEntry(JImageFile* jimage, const char* name);
virtual ~ClassPathImageEntry();
ClassFileStream* open_stream(const char* name, TRAPS);
// Debugging
NOT_PRODUCT(void compile_the_world(Handle loader, TRAPS);)
};
// ModuleClassPathList contains a linked list of ClassPathEntry's
// that have been specified for a specific module. Currently,
// the only way to specify a module/path pair is via the --patch-module
// command line option.
class ModuleClassPathList : public CHeapObj<mtClass> {
private:
Symbol* _module_name;
// First and last entries of class path entries for a specific module
ClassPathEntry* _module_first_entry;
ClassPathEntry* _module_last_entry;
public:
Symbol* module_name() const { return _module_name; }
ClassPathEntry* module_first_entry() const { return _module_first_entry; }
ModuleClassPathList(Symbol* module_name);
~ModuleClassPathList();
void add_to_list(ClassPathEntry* new_entry);
};
class SharedPathsMiscInfo;
class ClassLoader: AllStatic {
public:
enum ClassLoaderType {
BOOT_LOADER = 1, /* boot loader */
PLATFORM_LOADER = 2, /* PlatformClassLoader */
APP_LOADER = 3 /* AppClassLoader */
};
protected:
// Performance counters
static PerfCounter* _perf_accumulated_time;
static PerfCounter* _perf_classes_inited;
static PerfCounter* _perf_class_init_time;
static PerfCounter* _perf_class_init_selftime;
static PerfCounter* _perf_classes_verified;
static PerfCounter* _perf_class_verify_time;
static PerfCounter* _perf_class_verify_selftime;
static PerfCounter* _perf_classes_linked;
static PerfCounter* _perf_class_link_time;
static PerfCounter* _perf_class_link_selftime;
static PerfCounter* _perf_class_parse_time;
static PerfCounter* _perf_class_parse_selftime;
static PerfCounter* _perf_sys_class_lookup_time;
static PerfCounter* _perf_shared_classload_time;
static PerfCounter* _perf_sys_classload_time;
static PerfCounter* _perf_app_classload_time;
static PerfCounter* _perf_app_classload_selftime;
static PerfCounter* _perf_app_classload_count;
static PerfCounter* _perf_define_appclasses;
static PerfCounter* _perf_define_appclass_time;
static PerfCounter* _perf_define_appclass_selftime;
static PerfCounter* _perf_app_classfile_bytes_read;
static PerfCounter* _perf_sys_classfile_bytes_read;
static PerfCounter* _sync_systemLoaderLockContentionRate;
static PerfCounter* _sync_nonSystemLoaderLockContentionRate;
static PerfCounter* _sync_JVMFindLoadedClassLockFreeCounter;
static PerfCounter* _sync_JVMDefineClassLockFreeCounter;
static PerfCounter* _sync_JNIDefineClassLockFreeCounter;
static PerfCounter* _unsafe_defineClassCallCounter;
static PerfCounter* _isUnsyncloadClass;
static PerfCounter* _load_instance_class_failCounter;
// The boot class path consists of 3 ordered pieces:
// 1. the module/path pairs specified to --patch-module
// --patch-module=<module>=<file>(<pathsep><file>)*
// 2. the base piece
// [jimage | build with exploded modules]
// 3. boot loader append path
// [-Xbootclasspath/a]; [jvmti appended entries]
//
// The boot loader must obey this order when attempting
// to load a class.
// 1. Contains the module/path pairs specified to --patch-module
static GrowableArray<ModuleClassPathList*>* _patch_mod_entries;
// 2. the base piece
// Contains the ClassPathEntry of the modular java runtime image.
// If no java runtime image is present, this indicates a
// build with exploded modules is being used instead.
static ClassPathEntry* _jrt_entry;
static GrowableArray<ModuleClassPathList*>* _exploded_entries;
enum { EXPLODED_ENTRY_SIZE = 80 }; // Initial number of exploded modules
// 3. the boot loader's append path
// [-Xbootclasspath/a]; [jvmti appended entries]
// Note: boot loader append path does not support named modules.
static ClassPathEntry* _first_append_entry;
// Last entry in linked list of appended ClassPathEntry instances
static ClassPathEntry* _last_append_entry;
// Note: _num_entries includes the java runtime image and all
// the entries on the _first_append_entry linked list.
static int _num_entries;
// number of entries in the boot class path including the
// java runtime image
static int _num_boot_entries;
// Array of module names associated with the boot class loader
CDS_ONLY(static GrowableArray<char*>* _boot_modules_array;)
// Array of module names associated with the platform class loader
CDS_ONLY(static GrowableArray<char*>* _platform_modules_array;)
// Info used by CDS
CDS_ONLY(static SharedPathsMiscInfo * _shared_paths_misc_info;)
// Initialization:
// - setup the boot loader's system class path
// - setup the boot loader's patch mod entries, if present
// - create the ModuleEntry for java.base
static void setup_bootstrap_search_path();
static void setup_search_path(const char *class_path, bool setting_bootstrap);
static void setup_patch_mod_entries();
static void create_javabase();
static void load_zip_library();
static void load_jimage_library();
static ClassPathEntry* create_class_path_entry(const char *path, const struct stat* st,
bool throw_exception,
bool is_boot_append, TRAPS);
public:
// If the package for the fully qualified class name is in the boot
// loader's package entry table then add_package() sets the classpath_index
// field so that get_system_package() will know to return a non-null value
// for the package's location. And, so that the package will be added to
// the list of packages returned by get_system_packages().
// For packages whose classes are loaded from the boot loader class path, the
// classpath_index indicates which entry on the boot loader class path.
static bool add_package(const char *fullq_class_name, s2 classpath_index, TRAPS);
// Canonicalizes path names, so strcmp will work properly. This is mainly
// to avoid confusing the zip library
static bool get_canonical_path(const char* orig, char* out, int len);
static const char* file_name_for_class_name(const char* class_name,
int class_name_len);
static PackageEntry* get_package_entry(const char* class_name, ClassLoaderData* loader_data, TRAPS);
public:
static jboolean decompress(void *in, u8 inSize, void *out, u8 outSize, char **pmsg);
static int crc32(int crc, const char* buf, int len);
static bool update_class_path_entry_list(const char *path,
bool check_for_duplicates,
bool is_boot_append,
bool throw_exception=true);
static void print_bootclasspath();
// Timing
static PerfCounter* perf_accumulated_time() { return _perf_accumulated_time; }
static PerfCounter* perf_classes_inited() { return _perf_classes_inited; }
static PerfCounter* perf_class_init_time() { return _perf_class_init_time; }
static PerfCounter* perf_class_init_selftime() { return _perf_class_init_selftime; }
static PerfCounter* perf_classes_verified() { return _perf_classes_verified; }
static PerfCounter* perf_class_verify_time() { return _perf_class_verify_time; }
static PerfCounter* perf_class_verify_selftime() { return _perf_class_verify_selftime; }
static PerfCounter* perf_classes_linked() { return _perf_classes_linked; }
static PerfCounter* perf_class_link_time() { return _perf_class_link_time; }
static PerfCounter* perf_class_link_selftime() { return _perf_class_link_selftime; }
static PerfCounter* perf_class_parse_time() { return _perf_class_parse_time; }
static PerfCounter* perf_class_parse_selftime() { return _perf_class_parse_selftime; }
static PerfCounter* perf_sys_class_lookup_time() { return _perf_sys_class_lookup_time; }
static PerfCounter* perf_shared_classload_time() { return _perf_shared_classload_time; }
static PerfCounter* perf_sys_classload_time() { return _perf_sys_classload_time; }
static PerfCounter* perf_app_classload_time() { return _perf_app_classload_time; }
static PerfCounter* perf_app_classload_selftime() { return _perf_app_classload_selftime; }
static PerfCounter* perf_app_classload_count() { return _perf_app_classload_count; }
static PerfCounter* perf_define_appclasses() { return _perf_define_appclasses; }
static PerfCounter* perf_define_appclass_time() { return _perf_define_appclass_time; }
static PerfCounter* perf_define_appclass_selftime() { return _perf_define_appclass_selftime; }
static PerfCounter* perf_app_classfile_bytes_read() { return _perf_app_classfile_bytes_read; }
static PerfCounter* perf_sys_classfile_bytes_read() { return _perf_sys_classfile_bytes_read; }
// Record how often system loader lock object is contended
static PerfCounter* sync_systemLoaderLockContentionRate() {
return _sync_systemLoaderLockContentionRate;
}
// Record how often non system loader lock object is contended
static PerfCounter* sync_nonSystemLoaderLockContentionRate() {
return _sync_nonSystemLoaderLockContentionRate;
}
// Record how many calls to JVM_FindLoadedClass w/o holding a lock
static PerfCounter* sync_JVMFindLoadedClassLockFreeCounter() {
return _sync_JVMFindLoadedClassLockFreeCounter;
}
// Record how many calls to JVM_DefineClass w/o holding a lock
static PerfCounter* sync_JVMDefineClassLockFreeCounter() {
return _sync_JVMDefineClassLockFreeCounter;
}
// Record how many calls to jni_DefineClass w/o holding a lock
static PerfCounter* sync_JNIDefineClassLockFreeCounter() {
return _sync_JNIDefineClassLockFreeCounter;
}
// Record how many calls to Unsafe_DefineClass
static PerfCounter* unsafe_defineClassCallCounter() {
return _unsafe_defineClassCallCounter;
}
// Record how many times SystemDictionary::load_instance_class call
// fails with linkageError when Unsyncloadclass flag is set.
static PerfCounter* load_instance_class_failCounter() {
return _load_instance_class_failCounter;
}
// Modular java runtime image is present vs. a build with exploded modules
static bool has_jrt_entry() { return (_jrt_entry != NULL); }
static ClassPathEntry* get_jrt_entry() { return _jrt_entry; }
// Add a module's exploded directory to the boot loader's exploded module build list
static void add_to_exploded_build_list(Symbol* module_name, TRAPS);
// Attempt load of individual class from either the patched or exploded modules build lists
static ClassFileStream* search_module_entries(const GrowableArray<ModuleClassPathList*>* const module_list,
const char* const class_name,
const char* const file_name, TRAPS);
// Load individual .class file
static InstanceKlass* load_class(Symbol* class_name, bool search_append_only, TRAPS);
// If the specified package has been loaded by the system, then returns
// the name of the directory or ZIP file that the package was loaded from.
// Returns null if the package was not loaded.
// Note: The specified name can either be the name of a class or package.
// If a package name is specified, then it must be "/"-separator and also
// end with a trailing "/".
static oop get_system_package(const char* name, TRAPS);
// Returns an array of Java strings representing all of the currently
// loaded system packages.
// Note: The package names returned are "/"-separated and end with a
// trailing "/".
static objArrayOop get_system_packages(TRAPS);
// Initialization
static void initialize();
static void classLoader_init2(TRAPS);
CDS_ONLY(static void initialize_shared_path();)
static int compute_Object_vtable();
static ClassPathEntry* classpath_entry(int n) {
assert(n >= 0 && n < _num_entries, "sanity");
if (n == 0) {
assert(has_jrt_entry(), "No class path entry at 0 for exploded module builds");
return ClassLoader::_jrt_entry;
} else {
// The java runtime image is always the first entry
// in the FileMapInfo::_classpath_entry_table. Even though
// the _jrt_entry is not included in the _first_append_entry
// linked list, it must be accounted for when comparing the
// class path vs. the shared archive class path.
ClassPathEntry* e = ClassLoader::_first_append_entry;
while (--n >= 1) {
assert(e != NULL, "Not that many classpath entries.");
e = e->next();
}
return e;
}
}
static int number_of_classpath_entries() {
return _num_entries;
}
static bool is_in_patch_mod_entries(Symbol* module_name);
#if INCLUDE_CDS
// Sharing dump and restore
static void check_shared_classpath(const char *path);
static void finalize_shared_paths_misc_info();
static int get_shared_paths_misc_info_size();
static void* get_shared_paths_misc_info();
static bool check_shared_paths_misc_info(void* info, int size);
static void exit_with_path_failure(const char* error, const char* message);
static s2 module_to_classloader(const char* module_name);
static void initialize_module_loader_map(JImageFile* jimage);
static s2 classloader_type(Symbol* class_name, ClassPathEntry* e,
int classpath_index, TRAPS);
static void record_shared_class_loader_type(InstanceKlass* ik, const ClassFileStream* stream);
#endif
static JImageLocationRef jimage_find_resource(JImageFile* jf, const char* module_name,
const char* file_name, jlong &size);
static void trace_class_path(const char* msg, const char* name = NULL);
// VM monitoring and management support
static jlong classloader_time_ms();
static jlong class_method_total_size();
static jlong class_init_count();
static jlong class_init_time_ms();
static jlong class_verify_time_ms();
static jlong class_link_count();
static jlong class_link_time_ms();
static void set_first_append_entry(ClassPathEntry* entry);
// indicates if class path already contains a entry (exact match by name)
static bool contains_append_entry(const char* name);
// adds a class path list
static void add_to_list(ClassPathEntry* new_entry);
// creates a class path zip entry (returns NULL if JAR file cannot be opened)
static ClassPathZipEntry* create_class_path_zip_entry(const char *apath, bool is_boot_append);
// add a path to class path list
static void add_to_list(const char* apath);
static bool string_ends_with(const char* str, const char* str_to_find);
// obtain package name from a fully qualified class name
// *bad_class_name is set to true if there's a problem with parsing class_name, to
// distinguish from a class_name with no package name, as both cases have a NULL return value
static const char* package_from_name(const char* const class_name, bool* bad_class_name = NULL);
static bool is_jrt(const char* name) { return string_ends_with(name, MODULES_IMAGE_NAME); }
// Debugging
static void verify() PRODUCT_RETURN;
// Force compilation of all methods in all classes in bootstrap class path (stress test)
#ifndef PRODUCT
protected:
static int _compile_the_world_class_counter;
static int _compile_the_world_method_counter;
public:
static void compile_the_world();
static void compile_the_world_in(char* name, Handle loader, TRAPS);
static int compile_the_world_counter() { return _compile_the_world_class_counter; }
#endif //PRODUCT
};
// PerfClassTraceTime is used to measure time for class loading related events.
// This class tracks cumulative time and exclusive time for specific event types.
// During the execution of one event, other event types (e.g. class loading and
// resolution) as well as recursive calls of the same event type could happen.
// Only one elapsed timer (cumulative) and one thread-local self timer (exclusive)
// (i.e. only one event type) are active at a time even multiple PerfClassTraceTime
// instances have been created as multiple events are happening.
class PerfClassTraceTime {
public:
enum {
CLASS_LOAD = 0,
PARSE_CLASS = 1,
CLASS_LINK = 2,
CLASS_VERIFY = 3,
CLASS_CLINIT = 4,
DEFINE_CLASS = 5,
EVENT_TYPE_COUNT = 6
};
protected:
// _t tracks time from initialization to destruction of this timer instance
// including time for all other event types, and recursive calls of this type.
// When a timer is called recursively, the elapsedTimer _t would not be used.
elapsedTimer _t;
PerfLongCounter* _timep;
PerfLongCounter* _selftimep;
PerfLongCounter* _eventp;
// pointer to thread-local recursion counter and timer array
// The thread_local timers track cumulative time for specific event types
// exclusive of time for other event types, but including recursive calls
// of the same type.
int* _recursion_counters;
elapsedTimer* _timers;
int _event_type;
int _prev_active_event;
public:
inline PerfClassTraceTime(PerfLongCounter* timep, /* counter incremented with inclusive time */
PerfLongCounter* selftimep, /* counter incremented with exclusive time */
PerfLongCounter* eventp, /* event counter */
int* recursion_counters, /* thread-local recursion counter array */
elapsedTimer* timers, /* thread-local timer array */
int type /* event type */ ) :
_timep(timep), _selftimep(selftimep), _eventp(eventp), _recursion_counters(recursion_counters), _timers(timers), _event_type(type) {
initialize();
}
inline PerfClassTraceTime(PerfLongCounter* timep, /* counter incremented with inclusive time */
elapsedTimer* timers, /* thread-local timer array */
int type /* event type */ ) :
_timep(timep), _selftimep(NULL), _eventp(NULL), _recursion_counters(NULL), _timers(timers), _event_type(type) {
initialize();
}
inline void suspend() { _t.stop(); _timers[_event_type].stop(); }
inline void resume() { _t.start(); _timers[_event_type].start(); }
~PerfClassTraceTime();
void initialize();
};
#endif // SHARE_VM_CLASSFILE_CLASSLOADER_HPP