author | sjohanss |
Fri, 23 Nov 2018 10:57:07 +0100 | |
changeset 52674 | c9325aa887da |
parent 52596 | dfa02b3f728c |
child 53244 | 9807daeb47c4 |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 2003, 2018, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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||
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#ifndef SHARE_VM_MEMORY_FILEMAP_HPP |
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#define SHARE_VM_MEMORY_FILEMAP_HPP |
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#include "classfile/classLoader.hpp" |
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#include "include/cds.h" |
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#include "memory/metaspaceShared.hpp" |
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#include "memory/metaspace.hpp" |
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#include "memory/universe.hpp" |
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#include "utilities/align.hpp" |
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// Layout of the file: |
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// header: dump of archive instance plus versioning info, datestamp, etc. |
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// [magic # = 0xF00BABA2] |
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// ... padding to align on page-boundary |
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// read-write space |
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// read-only space |
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// misc data (block offset table, string table, symbols, dictionary, etc.) |
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// tag(666) |
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static const int JVM_IDENT_MAX = 256; |
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class SharedClassPathEntry { |
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enum { |
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modules_image_entry, |
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jar_entry, |
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signed_jar_entry, |
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dir_entry, |
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unknown_entry |
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}; |
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protected: |
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u1 _type; |
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time_t _timestamp; // jar timestamp, 0 if is directory, modules image or other |
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long _filesize; // jar/jimage file size, -1 if is directory, -2 if other |
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Array<char>* _name; |
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Array<u1>* _manifest; |
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public: |
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void init(const char* name, bool is_modules_image, TRAPS); |
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void metaspace_pointers_do(MetaspaceClosure* it); |
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bool validate(bool is_class_path = true); |
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// The _timestamp only gets set for jar files. |
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bool has_timestamp() { |
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return _timestamp != 0; |
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} |
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bool is_dir() { return _type == dir_entry; } |
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bool is_modules_image() { return _type == modules_image_entry; } |
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bool is_jar() { return _type == jar_entry; } |
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bool is_signed() { return _type == signed_jar_entry; } |
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void set_is_signed() { |
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_type = signed_jar_entry; |
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} |
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time_t timestamp() const { return _timestamp; } |
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long filesize() const { return _filesize; } |
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const char* name() const { return _name->data(); } |
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const char* manifest() const { |
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return (_manifest == NULL) ? NULL : (const char*)_manifest->data(); |
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} |
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int manifest_size() const { |
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return (_manifest == NULL) ? 0 : _manifest->length(); |
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} |
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void set_manifest(Array<u1>* manifest) { |
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_manifest = manifest; |
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} |
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}; |
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struct ArchiveHeapOopmapInfo { |
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address _oopmap; // bitmap for relocating embedded oops |
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size_t _oopmap_size_in_bits; |
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}; |
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struct FileMapHeader : public CDSFileMapHeaderBase { |
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size_t _alignment; // how shared archive should be aligned |
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int _obj_alignment; // value of ObjectAlignmentInBytes |
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address _narrow_oop_base; // compressed oop encoding base |
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int _narrow_oop_shift; // compressed oop encoding shift |
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bool _compact_strings; // value of CompactStrings |
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uintx _max_heap_size; // java max heap size during dumping |
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Universe::NARROW_OOP_MODE _narrow_oop_mode; // compressed oop encoding mode |
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int _narrow_klass_shift; // save narrow klass base and shift |
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address _narrow_klass_base; |
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char* _misc_data_patching_start; |
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char* _read_only_tables_start; |
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address _cds_i2i_entry_code_buffers; |
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size_t _cds_i2i_entry_code_buffers_size; |
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size_t _core_spaces_size; // number of bytes allocated by the core spaces |
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// (mc, md, ro, rw and od). |
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MemRegion _heap_reserved; // reserved region for the entire heap at dump time. |
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// The following fields are all sanity checks for whether this archive |
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// will function correctly with this JVM and the bootclasspath it's |
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// invoked with. |
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char _jvm_ident[JVM_IDENT_MAX]; // identifier for jvm |
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// The _paths_misc_info is a variable-size structure that records "miscellaneous" |
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// information during dumping. It is generated and validated by the |
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// SharedPathsMiscInfo class. See SharedPathsMiscInfo.hpp for |
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// detailed description. |
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// |
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// The _paths_misc_info data is stored as a byte array in the archive file header, |
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// immediately after the _header field. This information is used only when |
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// checking the validity of the archive and is deallocated after the archive is loaded. |
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// |
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// Note that the _paths_misc_info does NOT include information for JAR files |
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// that existed during dump time. Their information is stored in _shared_path_table. |
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int _paths_misc_info_size; |
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// The following is a table of all the class path entries that were used |
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// during dumping. At run time, we require these files to exist and have the same |
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// size/modification time, or else the archive will refuse to load. |
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// |
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// All of these entries must be JAR files. The dumping process would fail if a non-empty |
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// directory was specified in the classpaths. If an empty directory was specified |
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// it is checked by the _paths_misc_info as described above. |
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// |
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// FIXME -- if JAR files in the tail of the list were specified but not used during dumping, |
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// they should be removed from this table, to save space and to avoid spurious |
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// loading failures during runtime. |
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int _shared_path_table_size; |
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size_t _shared_path_entry_size; |
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Array<u8>* _shared_path_table; |
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jshort _app_class_paths_start_index; // Index of first app classpath entry |
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jshort _app_module_paths_start_index; // Index of first module path entry |
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jshort _max_used_path_index; // max path index referenced during CDS dump |
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bool _verify_local; // BytecodeVerificationLocal setting |
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bool _verify_remote; // BytecodeVerificationRemote setting |
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bool _has_platform_or_app_classes; // Archive contains app classes |
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size_t _shared_base_address; // SharedBaseAddress used at dump time |
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bool _allow_archiving_with_java_agent; // setting of the AllowArchivingWithJavaAgent option |
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155 |
|
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void set_has_platform_or_app_classes(bool v) { |
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_has_platform_or_app_classes = v; |
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} |
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bool has_platform_or_app_classes() { return _has_platform_or_app_classes; } |
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jshort max_used_path_index() { return _max_used_path_index; } |
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jshort app_module_paths_start_index() { return _app_module_paths_start_index; } |
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162 |
|
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bool validate(); |
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void populate(FileMapInfo* info, size_t alignment); |
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int compute_crc(); |
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166 |
|
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CDSFileMapRegion* space_at(int i) { |
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assert(i >= 0 && i < NUM_CDS_REGIONS, "invalid region"); |
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return &_space[i]; |
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} |
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}; |
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172 |
|
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class FileMapInfo : public CHeapObj<mtInternal> { |
1 | 174 |
private: |
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friend class ManifestStream; |
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friend class VMStructs; |
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friend struct FileMapHeader; |
1 | 178 |
|
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bool _file_open; |
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int _fd; |
27025 | 181 |
size_t _file_offset; |
1 | 182 |
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private: |
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static Array<u8>* _shared_path_table; |
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static int _shared_path_table_size; |
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static size_t _shared_path_entry_size; |
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static bool _validating_shared_path_table; |
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|
1 | 189 |
// FileMapHeader describes the shared space data in the file to be |
190 |
// mapped. This structure gets written to a file. It is not a class, so |
|
191 |
// that the compilers don't add any compiler-private data to it. |
|
192 |
||
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public: |
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struct FileMapHeaderBase : public CHeapObj<mtClass> { |
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// Need to put something here. Otherwise, in product build, because CHeapObj has no virtual |
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// methods, we would get sizeof(FileMapHeaderBase) == 1 with gcc. |
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intx _dummy; |
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}; |
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199 |
|
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200 |
|
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FileMapHeader * _header; |
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202 |
|
1 | 203 |
const char* _full_path; |
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char* _paths_misc_info; |
1 | 205 |
|
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static FileMapInfo* _current_info; |
|
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static bool _heap_pointers_need_patching; |
1 | 208 |
|
209 |
bool init_from_file(int fd); |
|
210 |
void align_file_position(); |
|
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bool validate_header_impl(); |
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static void metaspace_pointers_do(MetaspaceClosure* it); |
1 | 213 |
|
214 |
public: |
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FileMapInfo(); |
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~FileMapInfo(); |
1 | 217 |
|
27025 | 218 |
int compute_header_crc() { return _header->compute_crc(); } |
219 |
void set_header_crc(int crc) { _header->_crc = crc; } |
|
1 | 220 |
void populate_header(size_t alignment); |
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bool validate_header(); |
1 | 222 |
void invalidate(); |
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int version() { return _header->_version; } |
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size_t alignment() { return _header->_alignment; } |
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Universe::NARROW_OOP_MODE narrow_oop_mode() { return _header->_narrow_oop_mode; } |
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address narrow_oop_base() const { return _header->_narrow_oop_base; } |
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int narrow_oop_shift() const { return _header->_narrow_oop_shift; } |
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uintx max_heap_size() const { return _header->_max_heap_size; } |
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address narrow_klass_base() const { return _header->_narrow_klass_base; } |
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int narrow_klass_shift() const { return _header->_narrow_klass_shift; } |
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struct FileMapHeader* header() { return _header; } |
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char* misc_data_patching_start() { return _header->_misc_data_patching_start; } |
35231 | 233 |
void set_misc_data_patching_start(char* p) { _header->_misc_data_patching_start = p; } |
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char* read_only_tables_start() { return _header->_read_only_tables_start; } |
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void set_read_only_tables_start(char* p) { _header->_read_only_tables_start = p; } |
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236 |
|
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address cds_i2i_entry_code_buffers() { |
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return _header->_cds_i2i_entry_code_buffers; |
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239 |
} |
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void set_cds_i2i_entry_code_buffers(address addr) { |
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_header->_cds_i2i_entry_code_buffers = addr; |
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242 |
} |
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size_t cds_i2i_entry_code_buffers_size() { |
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return _header->_cds_i2i_entry_code_buffers_size; |
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} |
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void set_cds_i2i_entry_code_buffers_size(size_t s) { |
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_header->_cds_i2i_entry_code_buffers_size = s; |
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248 |
} |
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249 |
void set_core_spaces_size(size_t s) { _header->_core_spaces_size = s; } |
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250 |
size_t core_spaces_size() { return _header->_core_spaces_size; } |
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251 |
|
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252 |
static FileMapInfo* current_info() { |
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253 |
CDS_ONLY(return _current_info;) |
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254 |
NOT_CDS(return NULL;) |
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|
255 |
} |
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256 |
|
1 | 257 |
static void assert_mark(bool check); |
258 |
||
259 |
// File manipulation. |
|
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260 |
bool initialize() NOT_CDS_RETURN_(false); |
1 | 261 |
bool open_for_read(); |
262 |
void open_for_write(); |
|
263 |
void write_header(); |
|
264 |
void write_region(int region, char* base, size_t size, |
|
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bool read_only, bool allow_exec); |
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266 |
size_t write_archive_heap_regions(GrowableArray<MemRegion> *heap_mem, |
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267 |
GrowableArray<ArchiveHeapOopmapInfo> *oopmaps, |
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268 |
int first_region_id, int max_num_regions, |
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269 |
bool print_log); |
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270 |
void write_bytes(const void* buffer, size_t count); |
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271 |
void write_bytes_aligned(const void* buffer, size_t count); |
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char* map_region(int i, char** top_ret); |
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void map_heap_regions_impl() NOT_CDS_JAVA_HEAP_RETURN; |
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void map_heap_regions() NOT_CDS_JAVA_HEAP_RETURN; |
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void fixup_mapped_heap_regions() NOT_CDS_JAVA_HEAP_RETURN; |
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void patch_archived_heap_embedded_pointers() NOT_CDS_JAVA_HEAP_RETURN; |
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void patch_archived_heap_embedded_pointers(MemRegion* ranges, int num_ranges, |
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int first_region_idx) NOT_CDS_JAVA_HEAP_RETURN; |
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279 |
bool has_heap_regions() NOT_CDS_JAVA_HEAP_RETURN_(false); |
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280 |
MemRegion get_heap_regions_range_with_current_oop_encoding_mode() NOT_CDS_JAVA_HEAP_RETURN_(MemRegion()); |
1 | 281 |
void unmap_region(int i); |
27025 | 282 |
bool verify_region_checksum(int i); |
1 | 283 |
void close(); |
284 |
bool is_open() { return _file_open; } |
|
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285 |
ReservedSpace reserve_shared_memory(); |
1 | 286 |
|
287 |
// JVM/TI RedefineClasses() support: |
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// Remap the shared readonly space to shared readwrite, private. |
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bool remap_shared_readonly_as_readwrite(); |
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// Errors. |
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static void fail_stop(const char *msg, ...) ATTRIBUTE_PRINTF(1, 2); |
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static void fail_continue(const char *msg, ...) ATTRIBUTE_PRINTF(1, 2); |
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bool is_in_shared_region(const void* p, int idx) NOT_CDS_RETURN_(false); |
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// Stop CDS sharing and unmap CDS regions. |
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static void stop_sharing_and_unmap(const char* msg); |
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static void allocate_shared_path_table(); |
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static void check_nonempty_dir_in_shared_path_table(); |
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bool validate_shared_path_table(); |
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static void update_shared_classpath(ClassPathEntry *cpe, SharedClassPathEntry* ent, TRAPS); |
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static SharedClassPathEntry* shared_path(int index) { |
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if (index < 0) { |
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return NULL; |
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} |
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assert(index < _shared_path_table_size, "sanity"); |
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char* p = (char*)_shared_path_table->data(); |
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p += _shared_path_entry_size * index; |
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return (SharedClassPathEntry*)p; |
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} |
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static const char* shared_path_name(int index) { |
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assert(index >= 0, "Sanity"); |
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return shared_path(index)->name(); |
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} |
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|
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static int get_number_of_shared_paths() { |
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return _shared_path_table_size; |
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} |
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323 |
|
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char* region_addr(int idx); |
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|
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private: |
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bool map_heap_data(MemRegion **heap_mem, int first, int max, int* num, |
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bool is_open = false) NOT_CDS_JAVA_HEAP_RETURN_(false); |
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|
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bool verify_mapped_heap_regions(int first, int num) NOT_CDS_JAVA_HEAP_RETURN_(false); |
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330 |
void dealloc_archive_heap_regions(MemRegion* regions, int num, bool is_open) NOT_CDS_JAVA_HEAP_RETURN; |
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|
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332 |
CDSFileMapRegion* space_at(int i) { |
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return _header->space_at(i); |
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|
334 |
} |
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|
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narrowOop offset_of_space(CDSFileMapRegion* spc) { |
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return (narrowOop)(spc->_addr._offset); |
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} |
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|
339 |
|
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// The starting address of spc, as calculated with CompressedOop::decode_non_null() |
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address start_address_as_decoded_with_current_oop_encoding_mode(CDSFileMapRegion* spc) { |
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return decode_start_address(spc, true); |
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|
343 |
} |
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344 |
|
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// The starting address of spc, as calculated with HeapShared::decode_from_archive() |
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|
346 |
address start_address_as_decoded_from_archive(CDSFileMapRegion* spc) { |
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|
347 |
return decode_start_address(spc, false); |
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|
348 |
} |
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|
349 |
|
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|
350 |
address decode_start_address(CDSFileMapRegion* spc, bool with_current_oop_encoding_mode); |
1 | 351 |
}; |
7397 | 352 |
|
353 |
#endif // SHARE_VM_MEMORY_FILEMAP_HPP |