JDK14/Java14源码在线阅读
/*
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* 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
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*
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* 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.
*
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#ifndef SHARE_MEMORY_FILEMAP_HPP
#define SHARE_MEMORY_FILEMAP_HPP
#include "classfile/classLoader.hpp"
#include "include/cds.h"
#include "memory/metaspaceShared.hpp"
#include "memory/metaspace.hpp"
#include "oops/compressedOops.hpp"
#include "utilities/align.hpp"
// Layout of the file:
// header: dump of archive instance plus versioning info, datestamp, etc.
// [magic # = 0xF00BABA2]
// ... padding to align on page-boundary
// read-write space
// read-only space
// misc data (block offset table, string table, symbols, dictionary, etc.)
// tag(666)
static const int JVM_IDENT_MAX = 256;
class CHeapBitMap;
class SharedClassPathEntry {
enum {
modules_image_entry,
jar_entry,
signed_jar_entry,
dir_entry,
non_existent_entry,
unknown_entry
};
void set_name(const char* name, TRAPS);
u1 _type;
bool _from_class_path_attr;
time_t _timestamp; // jar timestamp, 0 if is directory, modules image or other
long _filesize; // jar/jimage file size, -1 if is directory, -2 if other
Array<char>* _name;
Array<u1>* _manifest;
public:
void init(bool is_modules_image, ClassPathEntry* cpe, TRAPS);
void init_as_non_existent(const char* path, TRAPS);
void metaspace_pointers_do(MetaspaceClosure* it);
bool validate(bool is_class_path = true) const;
// The _timestamp only gets set for jar files.
bool has_timestamp() const {
return _timestamp != 0;
}
bool is_dir() const { return _type == dir_entry; }
bool is_modules_image() const { return _type == modules_image_entry; }
bool is_jar() const { return _type == jar_entry; }
bool is_signed() const { return _type == signed_jar_entry; }
void set_is_signed() {
_type = signed_jar_entry;
}
bool from_class_path_attr() { return _from_class_path_attr; }
time_t timestamp() const { return _timestamp; }
long filesize() const { return _filesize; }
const char* name() const;
const char* manifest() const {
return (_manifest == NULL) ? NULL : (const char*)_manifest->data();
}
int manifest_size() const {
return (_manifest == NULL) ? 0 : _manifest->length();
}
void set_manifest(Array<u1>* manifest) {
_manifest = manifest;
}
bool check_non_existent() const;
};
struct ArchiveHeapOopmapInfo {
address _oopmap; // bitmap for relocating embedded oops
size_t _oopmap_size_in_bits;
};
class SharedPathTable {
Array<u8>* _table;
int _size;
public:
SharedPathTable() : _table(NULL), _size(0) {}
SharedPathTable(Array<u8>* table, int size) : _table(table), _size(size) {}
void dumptime_init(ClassLoaderData* loader_data, Thread* THREAD);
void metaspace_pointers_do(MetaspaceClosure* it);
int size() {
return _size;
}
SharedClassPathEntry* path_at(int index) {
if (index < 0) {
return NULL;
}
assert(index < _size, "sanity");
char* p = (char*)_table->data();
p += sizeof(SharedClassPathEntry) * index;
return (SharedClassPathEntry*)p;
}
Array<u8>* table() {return _table;}
void set_table(Array<u8>* table) {_table = table;}
};
class FileMapRegion: private CDSFileMapRegion {
void assert_is_heap_region() const {
assert(_is_heap_region, "must be heap region");
}
void assert_is_not_heap_region() const {
assert(!_is_heap_region, "must not be heap region");
}
public:
static FileMapRegion* cast(CDSFileMapRegion* p) {
return (FileMapRegion*)p;
}
// Accessors
int crc() const { return _crc; }
size_t file_offset() const { return _file_offset; }
size_t mapping_offset() const { return _mapping_offset; }
size_t mapping_end_offset() const { return _mapping_offset + used_aligned(); }
size_t used() const { return _used; }
size_t used_aligned() const; // aligned up to os::vm_allocation_granularity()
char* mapped_base() const { assert_is_not_heap_region(); return _mapped_base; }
char* mapped_end() const { return mapped_base() + used_aligned(); }
bool read_only() const { return _read_only != 0; }
bool allow_exec() const { return _allow_exec != 0; }
bool mapped_from_file() const { return _mapped_from_file != 0; }
size_t oopmap_offset() const { assert_is_heap_region(); return _oopmap_offset; }
size_t oopmap_size_in_bits() const { assert_is_heap_region(); return _oopmap_size_in_bits; }
void set_file_offset(size_t s) { _file_offset = s; }
void set_read_only(bool v) { _read_only = v; }
void set_mapped_base(char* p) { _mapped_base = p; }
void set_mapped_from_file(bool v) { _mapped_from_file = v; }
void init(int region_index, char* base, size_t size, bool read_only,
bool allow_exec, int crc);
void init_oopmap(size_t oopmap_offset, size_t size_in_bits) {
_oopmap_offset = oopmap_offset;
_oopmap_size_in_bits = size_in_bits;
}
};
class FileMapHeader: private CDSFileMapHeaderBase {
friend class CDSOffsets;
friend class VMStructs;
size_t _header_size;
// The following fields record the states of the VM during dump time.
// They are compared with the runtime states to see if the archive
// can be used.
size_t _alignment; // how shared archive should be aligned
int _obj_alignment; // value of ObjectAlignmentInBytes
address _narrow_oop_base; // compressed oop encoding base
int _narrow_oop_shift; // compressed oop encoding shift
bool _compact_strings; // value of CompactStrings
uintx _max_heap_size; // java max heap size during dumping
CompressedOops::Mode _narrow_oop_mode; // compressed oop encoding mode
int _narrow_klass_shift; // save narrow klass base and shift
size_t _misc_data_patching_offset;
size_t _serialized_data_offset; // Data accessed using {ReadClosure,WriteClosure}::serialize()
size_t _i2i_entry_code_buffers_offset;
size_t _i2i_entry_code_buffers_size;
address _heap_end; // heap end at dump time.
bool _base_archive_is_default; // indicates if the base archive is the system default one
// The following fields are all sanity checks for whether this archive
// will function correctly with this JVM and the bootclasspath it's
// invoked with.
char _jvm_ident[JVM_IDENT_MAX]; // identifier string of the jvm that created this dump
// size of the base archive name including NULL terminator
size_t _base_archive_name_size;
// The following is a table of all the boot/app/module path entries that were used
// during dumping. At run time, we validate these entries according to their
// SharedClassPathEntry::_type. See:
// check_nonempty_dir_in_shared_path_table()
// validate_shared_path_table()
// validate_non_existent_class_paths()
size_t _shared_path_table_offset;
int _shared_path_table_size;
jshort _app_class_paths_start_index; // Index of first app classpath entry
jshort _app_module_paths_start_index; // Index of first module path entry
jshort _num_module_paths; // number of module path entries
jshort _max_used_path_index; // max path index referenced during CDS dump
bool _verify_local; // BytecodeVerificationLocal setting
bool _verify_remote; // BytecodeVerificationRemote setting
bool _has_platform_or_app_classes; // Archive contains app classes
char* _requested_base_address; // Archive relocation is not necessary if we map with this base address.
char* _mapped_base_address; // Actual base address where archive is mapped.
bool _allow_archiving_with_java_agent; // setting of the AllowArchivingWithJavaAgent option
size_t _ptrmap_size_in_bits; // Size of pointer relocation bitmap
char* from_mapped_offset(size_t offset) const {
return mapped_base_address() + offset;
}
void set_mapped_offset(char* p, size_t *offset) {
assert(p >= mapped_base_address(), "sanity");
*offset = p - mapped_base_address();
}
public:
// Accessors -- fields declared in CDSFileMapHeaderBase
unsigned int magic() const {return _magic;}
int crc() const { return _crc; }
int version() const { return _version; }
void set_crc(int crc_value) { _crc = crc_value; }
void set_version(int v) { _version = v; }
// Accessors -- fields declared in FileMapHeader
size_t header_size() const { return _header_size; }
size_t alignment() const { return _alignment; }
int obj_alignment() const { return _obj_alignment; }
address narrow_oop_base() const { return _narrow_oop_base; }
int narrow_oop_shift() const { return _narrow_oop_shift; }
bool compact_strings() const { return _compact_strings; }
uintx max_heap_size() const { return _max_heap_size; }
CompressedOops::Mode narrow_oop_mode() const { return _narrow_oop_mode; }
int narrow_klass_shift() const { return _narrow_klass_shift; }
address narrow_klass_base() const { return (address)mapped_base_address(); }
char* misc_data_patching_start() const { return from_mapped_offset(_misc_data_patching_offset); }
char* serialized_data_start() const { return from_mapped_offset(_serialized_data_offset); }
address i2i_entry_code_buffers() const { return (address)from_mapped_offset(_i2i_entry_code_buffers_offset); }
size_t i2i_entry_code_buffers_size() const { return _i2i_entry_code_buffers_size; }
address heap_end() const { return _heap_end; }
bool base_archive_is_default() const { return _base_archive_is_default; }
const char* jvm_ident() const { return _jvm_ident; }
size_t base_archive_name_size() const { return _base_archive_name_size; }
char* requested_base_address() const { return _requested_base_address; }
char* mapped_base_address() const { return _mapped_base_address; }
bool has_platform_or_app_classes() const { return _has_platform_or_app_classes; }
size_t ptrmap_size_in_bits() const { return _ptrmap_size_in_bits; }
// FIXME: These should really return int
jshort max_used_path_index() const { return _max_used_path_index; }
jshort app_module_paths_start_index() const { return _app_module_paths_start_index; }
jshort app_class_paths_start_index() const { return _app_class_paths_start_index; }
jshort num_module_paths() const { return _num_module_paths; }
void set_has_platform_or_app_classes(bool v) { _has_platform_or_app_classes = v; }
void set_misc_data_patching_start(char* p) { set_mapped_offset(p, &_misc_data_patching_offset); }
void set_serialized_data_start(char* p) { set_mapped_offset(p, &_serialized_data_offset); }
void set_base_archive_name_size(size_t s) { _base_archive_name_size = s; }
void set_base_archive_is_default(bool b) { _base_archive_is_default = b; }
void set_header_size(size_t s) { _header_size = s; }
void set_ptrmap_size_in_bits(size_t s) { _ptrmap_size_in_bits = s; }
void set_mapped_base_address(char* p) { _mapped_base_address = p; }
void set_i2i_entry_code_buffers(address p, size_t s) {
set_mapped_offset((char*)p, &_i2i_entry_code_buffers_offset);
_i2i_entry_code_buffers_size = s;
}
void set_shared_path_table(SharedPathTable table) {
set_mapped_offset((char*)table.table(), &_shared_path_table_offset);
_shared_path_table_size = table.size();
}
void set_final_requested_base(char* b) {
_requested_base_address = b;
_mapped_base_address = 0;
}
SharedPathTable shared_path_table() const {
return SharedPathTable((Array<u8>*)from_mapped_offset(_shared_path_table_offset),
_shared_path_table_size);
}
bool validate();
int compute_crc();
FileMapRegion* space_at(int i) {
assert(is_valid_region(i), "invalid region");
return FileMapRegion::cast(&_space[i]);
}
void populate(FileMapInfo* info, size_t alignment);
static bool is_valid_region(int region) {
return (0 <= region && region < NUM_CDS_REGIONS);
}
};
class FileMapInfo : public CHeapObj<mtInternal> {
private:
friend class ManifestStream;
friend class VMStructs;
friend class CDSOffsets;
friend class FileMapHeader;
bool _is_static;
bool _file_open;
bool _is_mapped;
int _fd;
size_t _file_offset;
const char* _full_path;
const char* _base_archive_name;
FileMapHeader* _header;
// TODO: Probably change the following to be non-static
static SharedPathTable _shared_path_table;
static bool _validating_shared_path_table;
// FileMapHeader describes the shared space data in the file to be
// mapped. This structure gets written to a file. It is not a class, so
// that the compilers don't add any compiler-private data to it.
static FileMapInfo* _current_info;
static FileMapInfo* _dynamic_archive_info;
static bool _heap_pointers_need_patching;
static bool _memory_mapping_failed;
static GrowableArray<const char*>* _non_existent_class_paths;
FileMapHeader *header() const { return _header; }
public:
static bool get_base_archive_name_from_header(const char* archive_name,
int* size, char** base_archive_name);
static bool check_archive(const char* archive_name, bool is_static);
static SharedPathTable shared_path_table() {
return _shared_path_table;
}
void restore_shared_path_table();
bool init_from_file(int fd);
static void metaspace_pointers_do(MetaspaceClosure* it);
void log_paths(const char* msg, int start_idx, int end_idx);
FileMapInfo(bool is_static);
~FileMapInfo();
// Accessors
int compute_header_crc() const { return header()->compute_crc(); }
void set_header_crc(int crc) { header()->set_crc(crc); }
int space_crc(int i) const { return space_at(i)->crc(); }
void populate_header(size_t alignment);
bool validate_header();
void invalidate();
int crc() const { return header()->crc(); }
int version() const { return header()->version(); }
size_t alignment() const { return header()->alignment(); }
address narrow_oop_base() const { return header()->narrow_oop_base(); }
int narrow_oop_shift() const { return header()->narrow_oop_shift(); }
uintx max_heap_size() const { return header()->max_heap_size(); }
address narrow_klass_base() const { return header()->narrow_klass_base(); }
int narrow_klass_shift() const { return header()->narrow_klass_shift(); }
CompressedOops::Mode narrow_oop_mode() const { return header()->narrow_oop_mode(); }
jshort app_module_paths_start_index() const { return header()->app_module_paths_start_index(); }
jshort app_class_paths_start_index() const { return header()->app_class_paths_start_index(); }
char* misc_data_patching_start() const { return header()->misc_data_patching_start(); }
void set_misc_data_patching_start(char* p) const { header()->set_misc_data_patching_start(p); }
char* serialized_data_start() const { return header()->serialized_data_start(); }
void set_serialized_data_start(char* p) const { header()->set_serialized_data_start(p); }
bool is_file_position_aligned() const;
void align_file_position();
address i2i_entry_code_buffers() const { return header()->i2i_entry_code_buffers(); }
size_t i2i_entry_code_buffers_size() const { return header()->i2i_entry_code_buffers_size(); }
void set_i2i_entry_code_buffers(address addr, size_t s) const {
header()->set_i2i_entry_code_buffers(addr, s);
}
bool is_static() const { return _is_static; }
bool is_mapped() const { return _is_mapped; }
void set_is_mapped(bool v) { _is_mapped = v; }
const char* full_path() const { return _full_path; }
void set_final_requested_base(char* b);
char* requested_base_address() const { return header()->requested_base_address(); }
class DynamicArchiveHeader* dynamic_header() const {
assert(!is_static(), "must be");
return (DynamicArchiveHeader*)header();
}
void set_has_platform_or_app_classes(bool v) {
header()->set_has_platform_or_app_classes(v);
}
bool has_platform_or_app_classes() const {
return header()->has_platform_or_app_classes();
}
static FileMapInfo* current_info() {
CDS_ONLY(return _current_info;)
NOT_CDS(return NULL;)
}
static void set_current_info(FileMapInfo* info) {
CDS_ONLY(_current_info = info;)
}
static FileMapInfo* dynamic_info() {
CDS_ONLY(return _dynamic_archive_info;)
NOT_CDS(return NULL;)
}
static void assert_mark(bool check);
// File manipulation.
bool initialize() NOT_CDS_RETURN_(false);
bool open_for_read();
void open_for_write(const char* path = NULL);
void write_header();
void write_region(int region, char* base, size_t size,
bool read_only, bool allow_exec);
void write_bitmap_region(const CHeapBitMap* ptrmap);
size_t write_archive_heap_regions(GrowableArray<MemRegion> *heap_mem,
GrowableArray<ArchiveHeapOopmapInfo> *oopmaps,
int first_region_id, int max_num_regions);
void write_bytes(const void* buffer, size_t count);
void write_bytes_aligned(const void* buffer, size_t count);
size_t read_bytes(void* buffer, size_t count);
MapArchiveResult map_regions(int regions[], int num_regions, char* mapped_base_address, ReservedSpace rs);
void unmap_regions(int regions[], int num_regions);
void map_heap_regions() NOT_CDS_JAVA_HEAP_RETURN;
void fixup_mapped_heap_regions() NOT_CDS_JAVA_HEAP_RETURN;
void patch_archived_heap_embedded_pointers() NOT_CDS_JAVA_HEAP_RETURN;
void patch_archived_heap_embedded_pointers(MemRegion* ranges, int num_ranges,
int first_region_idx) NOT_CDS_JAVA_HEAP_RETURN;
bool has_heap_regions() NOT_CDS_JAVA_HEAP_RETURN_(false);
MemRegion get_heap_regions_range_with_current_oop_encoding_mode() NOT_CDS_JAVA_HEAP_RETURN_(MemRegion());
void unmap_region(int i);
bool verify_region_checksum(int i);
void close();
bool is_open() { return _file_open; }
ReservedSpace reserve_shared_memory();
// JVM/TI RedefineClasses() support:
// Remap the shared readonly space to shared readwrite, private.
bool remap_shared_readonly_as_readwrite();
// Errors.
static void fail_stop(const char *msg, ...) ATTRIBUTE_PRINTF(1, 2);
static void fail_continue(const char *msg, ...) ATTRIBUTE_PRINTF(1, 2);
static bool memory_mapping_failed() {
CDS_ONLY(return _memory_mapping_failed;)
NOT_CDS(return false;)
}
bool is_in_shared_region(const void* p, int idx) NOT_CDS_RETURN_(false);
// Stop CDS sharing and unmap CDS regions.
static void stop_sharing_and_unmap(const char* msg);
static void allocate_shared_path_table();
static int add_shared_classpaths(int i, const char* which, ClassPathEntry *cpe, TRAPS);
static void check_nonempty_dir_in_shared_path_table();
bool validate_shared_path_table();
void validate_non_existent_class_paths();
static void set_shared_path_table(FileMapInfo* info) {
_shared_path_table = info->header()->shared_path_table();
}
static void update_jar_manifest(ClassPathEntry *cpe, SharedClassPathEntry* ent, TRAPS);
static int num_non_existent_class_paths();
static void record_non_existent_class_path_entry(const char* path);
#if INCLUDE_JVMTI
static ClassFileStream* open_stream_for_jvmti(InstanceKlass* ik, Handle class_loader, TRAPS);
#endif
static SharedClassPathEntry* shared_path(int index) {
return _shared_path_table.path_at(index);
}
static const char* shared_path_name(int index) {
assert(index >= 0, "Sanity");
return shared_path(index)->name();
}
static int get_number_of_shared_paths() {
return _shared_path_table.size();
}
char* region_addr(int idx);
// The offset of the first core region in the archive, relative to SharedBaseAddress
size_t mapping_base_offset() const { return first_core_space()->mapping_offset(); }
// The offset of the (exclusive) end of the last core region in this archive, relative to SharedBaseAddress
size_t mapping_end_offset() const { return last_core_space()->mapping_end_offset(); }
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