Mercurial > hg > graal-compiler
view src/share/vm/memory/filemap.cpp @ 1630:7cc68a696c62
6966252: Bump the HS19 build number to 04
Summary: Update the HS19 build number to 04
Reviewed-by: jcoomes
author | trims |
---|---|
date | Fri, 02 Jul 2010 01:37:36 -0700 |
parents | c18cbe5936b8 |
children | f95d63e2154a |
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/* * Copyright (c) 2003, 2006, 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. * */ # include "incls/_precompiled.incl" # include "incls/_filemap.cpp.incl" # include <sys/stat.h> # include <errno.h> #ifndef O_BINARY // if defined (Win32) use binary files. #define O_BINARY 0 // otherwise do nothing. #endif extern address JVM_FunctionAtStart(); extern address JVM_FunctionAtEnd(); // Complain and stop. All error conditions occurring during the writing of // an archive file should stop the process. Unrecoverable errors during // the reading of the archive file should stop the process. static void fail(const char *msg, va_list ap) { // This occurs very early during initialization: tty is not initialized. jio_fprintf(defaultStream::error_stream(), "An error has occurred while processing the" " shared archive file.\n"); jio_vfprintf(defaultStream::error_stream(), msg, ap); jio_fprintf(defaultStream::error_stream(), "\n"); vm_exit_during_initialization("Unable to use shared archive.", NULL); } void FileMapInfo::fail_stop(const char *msg, ...) { va_list ap; va_start(ap, msg); fail(msg, ap); // Never returns. va_end(ap); // for completeness. } // Complain and continue. Recoverable errors during the reading of the // archive file may continue (with sharing disabled). // // If we continue, then disable shared spaces and close the file. void FileMapInfo::fail_continue(const char *msg, ...) { va_list ap; va_start(ap, msg); if (RequireSharedSpaces) { fail(msg, ap); } va_end(ap); UseSharedSpaces = false; close(); } // Fill in the fileMapInfo structure with data about this VM instance. void FileMapInfo::populate_header(size_t alignment) { _header._magic = 0xf00baba2; _header._version = _current_version; _header._alignment = alignment; // The following fields are for sanity checks for whether this archive // will function correctly with this JVM and the bootclasspath it's // invoked with. // JVM version string ... changes on each build. const char *vm_version = VM_Version::internal_vm_info_string(); if (strlen(vm_version) < (JVM_IDENT_MAX-1)) { strcpy(_header._jvm_ident, vm_version); } else { fail_stop("JVM Ident field for shared archive is too long" " - truncated to <%s>", _header._jvm_ident); } // Build checks on classpath and jar files _header._num_jars = 0; ClassPathEntry *cpe = ClassLoader::classpath_entry(0); for ( ; cpe != NULL; cpe = cpe->next()) { if (cpe->is_jar_file()) { if (_header._num_jars >= JVM_SHARED_JARS_MAX) { fail_stop("Too many jar files to share.", NULL); } // Jar file - record timestamp and file size. struct stat st; const char *path = cpe->name(); if (os::stat(path, &st) != 0) { // If we can't access a jar file in the boot path, then we can't // make assumptions about where classes get loaded from. fail_stop("Unable to open jar file %s.", path); } _header._jar[_header._num_jars]._timestamp = st.st_mtime; _header._jar[_header._num_jars]._filesize = st.st_size; _header._num_jars++; } else { // If directories appear in boot classpath, they must be empty to // avoid having to verify each individual class file. const char* name = ((ClassPathDirEntry*)cpe)->name(); if (!os::dir_is_empty(name)) { fail_stop("Boot classpath directory %s is not empty.", name); } } } } // Read the FileMapInfo information from the file. bool FileMapInfo::init_from_file(int fd) { size_t n = read(fd, &_header, sizeof(struct FileMapHeader)); if (n != sizeof(struct FileMapHeader)) { fail_continue("Unable to read the file header."); return false; } if (_header._version != current_version()) { fail_continue("The shared archive file has the wrong version."); return false; } _file_offset = (long)n; return true; } // Read the FileMapInfo information from the file. bool FileMapInfo::open_for_read() { _full_path = Arguments::GetSharedArchivePath(); int fd = open(_full_path, O_RDONLY | O_BINARY, 0); if (fd < 0) { if (errno == ENOENT) { // Not locating the shared archive is ok. fail_continue("Specified shared archive not found."); } else { fail_continue("Failed to open shared archive file (%s).", strerror(errno)); } return false; } _fd = fd; _file_open = true; return true; } // Write the FileMapInfo information to the file. void FileMapInfo::open_for_write() { _full_path = Arguments::GetSharedArchivePath(); if (PrintSharedSpaces) { tty->print_cr("Dumping shared data to file: "); tty->print_cr(" %s", _full_path); } // Remove the existing file in case another process has it open. remove(_full_path); int fd = open(_full_path, O_RDWR | O_CREAT | O_TRUNC | O_BINARY, 0444); if (fd < 0) { fail_stop("Unable to create shared archive file %s.", _full_path); } _fd = fd; _file_offset = 0; _file_open = true; } // Write the header to the file, seek to the next allocation boundary. void FileMapInfo::write_header() { write_bytes_aligned(&_header, sizeof(FileMapHeader)); } // Dump shared spaces to file. void FileMapInfo::write_space(int i, CompactibleSpace* space, bool read_only) { align_file_position(); struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; write_region(i, (char*)space->bottom(), space->used(), space->capacity(), read_only, false); } // Dump region to file. void FileMapInfo::write_region(int region, char* base, size_t size, size_t capacity, bool read_only, bool allow_exec) { struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[region]; if (_file_open) { guarantee(si->_file_offset == _file_offset, "file offset mismatch."); if (PrintSharedSpaces) { tty->print_cr("Shared file region %d: 0x%x bytes, addr 0x%x," " file offset 0x%x", region, size, base, _file_offset); } } else { si->_file_offset = _file_offset; } si->_base = base; si->_used = size; si->_capacity = capacity; si->_read_only = read_only; si->_allow_exec = allow_exec; write_bytes_aligned(base, (int)size); } // Dump bytes to file -- at the current file position. void FileMapInfo::write_bytes(const void* buffer, int nbytes) { if (_file_open) { int n = ::write(_fd, buffer, nbytes); if (n != nbytes) { // It is dangerous to leave the corrupted shared archive file around, // close and remove the file. See bug 6372906. close(); remove(_full_path); fail_stop("Unable to write to shared archive file.", NULL); } } _file_offset += nbytes; } // Align file position to an allocation unit boundary. void FileMapInfo::align_file_position() { long new_file_offset = align_size_up(_file_offset, os::vm_allocation_granularity()); if (new_file_offset != _file_offset) { _file_offset = new_file_offset; if (_file_open) { // Seek one byte back from the target and write a byte to insure // that the written file is the correct length. _file_offset -= 1; if (lseek(_fd, _file_offset, SEEK_SET) < 0) { fail_stop("Unable to seek.", NULL); } char zero = 0; write_bytes(&zero, 1); } } } // Dump bytes to file -- at the current file position. void FileMapInfo::write_bytes_aligned(const void* buffer, int nbytes) { align_file_position(); write_bytes(buffer, nbytes); align_file_position(); } // Close the shared archive file. This does NOT unmap mapped regions. void FileMapInfo::close() { if (_file_open) { if (::close(_fd) < 0) { fail_stop("Unable to close the shared archive file."); } _file_open = false; _fd = -1; } } // Memory map a shared space from the archive file. bool FileMapInfo::map_space(int i, ReservedSpace rs, ContiguousSpace* space) { struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; if (space != NULL) { if (si->_base != (char*)space->bottom() || si->_capacity != space->capacity()) { fail_continue("Shared space base address does not match."); return false; } } bool result = (map_region(i, rs) != NULL); if (space != NULL && result) { space->set_top((HeapWord*)(si->_base + si->_used)); space->set_saved_mark(); } return result; } // JVM/TI RedefineClasses() support: // Remap the shared readonly space to shared readwrite, private. bool FileMapInfo::remap_shared_readonly_as_readwrite() { struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[0]; if (!si->_read_only) { // the space is already readwrite so we are done return true; } size_t used = si->_used; size_t size = align_size_up(used, os::vm_allocation_granularity()); if (!open_for_read()) { return false; } char *base = os::remap_memory(_fd, _full_path, si->_file_offset, si->_base, size, false /* !read_only */, si->_allow_exec); close(); if (base == NULL) { fail_continue("Unable to remap shared readonly space (errno=%d).", errno); return false; } if (base != si->_base) { fail_continue("Unable to remap shared readonly space at required address."); return false; } si->_read_only = false; return true; } // Memory map a region in the address space. char* FileMapInfo::map_region(int i, ReservedSpace rs) { struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; size_t used = si->_used; size_t size = align_size_up(used, os::vm_allocation_granularity()); ReservedSpace mapped_rs = rs.first_part(size, true, true); ReservedSpace unmapped_rs = rs.last_part(size); mapped_rs.release(); return map_region(i, true); } // Memory map a region in the address space. char* FileMapInfo::map_region(int i, bool address_must_match) { struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; size_t used = si->_used; size_t size = align_size_up(used, os::vm_allocation_granularity()); char *requested_addr = 0; if (address_must_match) { requested_addr = si->_base; } char *base = os::map_memory(_fd, _full_path, si->_file_offset, requested_addr, size, si->_read_only, si->_allow_exec); if (base == NULL) { fail_continue("Unable to map shared space."); return NULL; } if (address_must_match) { if (base != si->_base) { fail_continue("Unable to map shared space at required address."); return NULL; } } else { si->_base = base; // save mapped address for unmapping. } return base; } // Unmap a memory region in the address space. void FileMapInfo::unmap_region(int i) { struct FileMapInfo::FileMapHeader::space_info* si = &_header._space[i]; size_t used = si->_used; size_t size = align_size_up(used, os::vm_allocation_granularity()); if (!os::unmap_memory(si->_base, size)) { fail_stop("Unable to unmap shared space."); } } void FileMapInfo::assert_mark(bool check) { if (!check) { fail_stop("Mark mismatch while restoring from shared file.", NULL); } } FileMapInfo* FileMapInfo::_current_info = NULL; // Open the shared archive file, read and validate the header // information (version, boot classpath, etc.). If initialization // fails, shared spaces are disabled and the file is closed. [See // fail_continue.] bool FileMapInfo::initialize() { assert(UseSharedSpaces, "UseSharedSpaces expected."); if (JvmtiExport::can_modify_any_class() || JvmtiExport::can_walk_any_space()) { fail_continue("Tool agent requires sharing to be disabled."); return false; } if (!open_for_read()) { return false; } init_from_file(_fd); if (!validate()) { return false; } SharedReadOnlySize = _header._space[0]._capacity; SharedReadWriteSize = _header._space[1]._capacity; SharedMiscDataSize = _header._space[2]._capacity; SharedMiscCodeSize = _header._space[3]._capacity; return true; } bool FileMapInfo::validate() { if (_header._version != current_version()) { fail_continue("The shared archive file is the wrong version."); return false; } if (_header._magic != (int)0xf00baba2) { fail_continue("The shared archive file has a bad magic number."); return false; } if (strncmp(_header._jvm_ident, VM_Version::internal_vm_info_string(), JVM_IDENT_MAX-1) != 0) { fail_continue("The shared archive file was created by a different" " version or build of HotSpot."); return false; } // Cannot verify interpreter yet, as it can only be created after the GC // heap has been initialized. if (_header._num_jars >= JVM_SHARED_JARS_MAX) { fail_continue("Too many jar files to share."); return false; } // Build checks on classpath and jar files int num_jars_now = 0; ClassPathEntry *cpe = ClassLoader::classpath_entry(0); for ( ; cpe != NULL; cpe = cpe->next()) { if (cpe->is_jar_file()) { if (num_jars_now < _header._num_jars) { // Jar file - verify timestamp and file size. struct stat st; const char *path = cpe->name(); if (os::stat(path, &st) != 0) { fail_continue("Unable to open jar file %s.", path); return false; } if (_header._jar[num_jars_now]._timestamp != st.st_mtime || _header._jar[num_jars_now]._filesize != st.st_size) { fail_continue("A jar file is not the one used while building" " the shared archive file."); return false; } } ++num_jars_now; } else { // If directories appear in boot classpath, they must be empty to // avoid having to verify each individual class file. const char* name = ((ClassPathDirEntry*)cpe)->name(); if (!os::dir_is_empty(name)) { fail_continue("Boot classpath directory %s is not empty.", name); return false; } } } if (num_jars_now < _header._num_jars) { fail_continue("The number of jar files in the boot classpath is" " less than the number the shared archive was created with."); return false; } return true; } // The following method is provided to see whether a given pointer // falls in the mapped shared space. // Param: // p, The given pointer // Return: // True if the p is within the mapped shared space, otherwise, false. bool FileMapInfo::is_in_shared_space(const void* p) { for (int i = 0; i < CompactingPermGenGen::n_regions; i++) { if (p >= _header._space[i]._base && p < _header._space[i]._base + _header._space[i]._used) { return true; } } return false; }