--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/hotspot/src/share/vm/memory/filemap.hpp Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,139 @@
+/*
+ * Copyright 2003-2006 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.
+ *
+ */
+
+// 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 from CompactingPermGenGen
+// read-only space from CompactingPermGenGen
+// misc data (block offset table, string table, symbols, dictionary, etc.)
+// tag(666)
+
+static const int JVM_SHARED_JARS_MAX = 128;
+static const int JVM_SPACENAME_MAX = 128;
+static const int JVM_IDENT_MAX = 256;
+static const int JVM_ARCH_MAX = 12;
+
+
+
+class FileMapInfo : public CHeapObj {
+private:
+ enum {
+ _invalid_version = -1,
+ _current_version = 1
+ };
+
+ bool _file_open;
+ int _fd;
+ long _file_offset;
+
+ // 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.
+
+ struct FileMapHeader {
+ int _magic; // identify file type.
+ int _version; // (from enum, above.)
+ size_t _alignment; // how shared archive should be aligned
+
+ struct space_info {
+ int _file_offset; // sizeof(this) rounded to vm page size
+ char* _base; // copy-on-write base address
+ size_t _capacity; // for validity checking
+ size_t _used; // for setting space top on read
+ bool _read_only; // read only space?
+ bool _allow_exec; // executable code in space?
+ } _space[CompactingPermGenGen::n_regions];
+
+ // 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 _arch[JVM_ARCH_MAX]; // architecture
+ char _jvm_ident[JVM_IDENT_MAX]; // identifier for jvm
+ int _num_jars; // Number of jars in bootclasspath
+
+ // Per jar file data: timestamp, size.
+
+ struct {
+ time_t _timestamp; // jar timestamp.
+ long _filesize; // jar file size.
+ } _jar[JVM_SHARED_JARS_MAX];
+ } _header;
+ const char* _full_path;
+
+ static FileMapInfo* _current_info;
+
+ bool init_from_file(int fd);
+ void align_file_position();
+
+public:
+ FileMapInfo() {
+ _file_offset = 0;
+ _file_open = false;
+ _header._version = _invalid_version;
+ }
+
+ static int current_version() { return _current_version; }
+ void populate_header(size_t alignment);
+ bool validate();
+ void invalidate();
+ int version() { return _header._version; }
+ size_t alignment() { return _header._alignment; }
+ size_t space_capacity(int i) { return _header._space[i]._capacity; }
+ char* region_base(int i) { return _header._space[i]._base; }
+ struct FileMapHeader* header() { return &_header; }
+
+ static void set_current_info(FileMapInfo* info) { _current_info = info; }
+ static FileMapInfo* current_info() { return _current_info; }
+ static void assert_mark(bool check);
+
+ // File manipulation.
+ bool initialize();
+ bool open_for_read();
+ void open_for_write();
+ void write_header();
+ void write_space(int i, CompactibleSpace* space, bool read_only);
+ void write_region(int region, char* base, size_t size,
+ size_t capacity, bool read_only, bool allow_exec);
+ void write_bytes(const void* buffer, int count);
+ void write_bytes_aligned(const void* buffer, int count);
+ bool map_space(int i, ReservedSpace rs, ContiguousSpace *space);
+ char* map_region(int i, ReservedSpace rs);
+ char* map_region(int i, bool address_must_match);
+ void unmap_region(int i);
+ void close();
+ bool is_open() { return _file_open; }
+
+ // 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, ...);
+ void fail_continue(const char *msg, ...);
+
+ // Return true if given address is in the mapped shared space.
+ bool is_in_shared_space(const void* p);
+};