8204965: Fix '--disable-cds' and disable CDS on AIX by default
Reviewed-by: erikj, jiangli, stuefe, dholmes
/*
* Copyright (c) 2014, 2018, 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.
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*/
#include "precompiled.hpp"
#include "classfile/classLoader.hpp"
#include "classfile/sharedPathsMiscInfo.hpp"
#include "logging/log.hpp"
#include "logging/logStream.hpp"
#include "memory/allocation.inline.hpp"
#include "memory/filemap.hpp"
#include "memory/metaspaceShared.hpp"
#include "memory/resourceArea.hpp"
#include "runtime/arguments.hpp"
#include "runtime/os.inline.hpp"
#include "utilities/ostream.hpp"
SharedPathsMiscInfo::SharedPathsMiscInfo() {
_app_offset = 0;
_buf_size = INITIAL_BUF_SIZE;
_cur_ptr = _buf_start = NEW_C_HEAP_ARRAY(char, _buf_size, mtClass);
_allocated = true;
}
SharedPathsMiscInfo::~SharedPathsMiscInfo() {
if (_allocated) {
FREE_C_HEAP_ARRAY(char, _buf_start);
}
}
void SharedPathsMiscInfo::add_path(const char* path, int type) {
log_info(class, path)("type=%s ", type_name(type));
ClassLoader::trace_class_path("add misc shared path ", path);
write(path, strlen(path) + 1);
write_jint(jint(type));
}
void SharedPathsMiscInfo::ensure_size(size_t needed_bytes) {
assert(_allocated, "cannot modify buffer during validation.");
int used = get_used_bytes();
int target = used + int(needed_bytes);
if (target > _buf_size) {
_buf_size = _buf_size * 2 + (int)needed_bytes;
_buf_start = REALLOC_C_HEAP_ARRAY(char, _buf_start, _buf_size, mtClass);
_cur_ptr = _buf_start + used;
_end_ptr = _buf_start + _buf_size;
}
}
void SharedPathsMiscInfo::write(const void* ptr, size_t size) {
ensure_size(size);
memcpy(_cur_ptr, ptr, size);
_cur_ptr += size;
}
bool SharedPathsMiscInfo::read(void* ptr, size_t size) {
if (_cur_ptr + size <= _end_ptr) {
memcpy(ptr, _cur_ptr, size);
_cur_ptr += size;
return true;
}
return false;
}
bool SharedPathsMiscInfo::fail(const char* msg, const char* name) {
ClassLoader::trace_class_path(msg, name);
MetaspaceShared::set_archive_loading_failed();
return false;
}
void SharedPathsMiscInfo::print_path(outputStream* out, int type, const char* path) {
switch (type) {
case BOOT_PATH:
out->print("Expecting BOOT path=%s", path);
break;
case NON_EXIST:
out->print("Expecting that %s does not exist", path);
break;
case APP_PATH:
ClassLoader::trace_class_path("Expecting -Djava.class.path=", path);
break;
default:
ShouldNotReachHere();
}
}
bool SharedPathsMiscInfo::check() {
// The whole buffer must be 0 terminated so that we can use strlen and strcmp
// without fear.
_end_ptr -= sizeof(jint);
if (_cur_ptr >= _end_ptr) {
return fail("Truncated archive file header");
}
if (*_end_ptr != 0) {
return fail("Corrupted archive file header");
}
while (_cur_ptr < _end_ptr) {
jint type;
const char* path = _cur_ptr;
_cur_ptr += strlen(path) + 1;
if (!read_jint(&type)) {
return fail("Corrupted archive file header");
}
LogTarget(Info, class, path) lt;
if (lt.is_enabled()) {
lt.print("type=%s ", type_name(type));
LogStream ls(lt);
print_path(&ls, type, path);
ls.cr();
}
if (!check(type, path)) {
if (!PrintSharedArchiveAndExit) {
return false;
}
} else {
ClassLoader::trace_class_path("ok");
}
}
return true;
}
char* skip_first_path_entry(const char* path) {
size_t path_sep_len = strlen(os::path_separator());
char* p = strstr((char*)path, os::path_separator());
if (p != NULL) {
debug_only( {
size_t image_name_len = strlen(MODULES_IMAGE_NAME);
assert(strncmp(p - image_name_len, MODULES_IMAGE_NAME, image_name_len) == 0,
"first entry must be the modules image");
} );
p += path_sep_len;
} else {
debug_only( {
assert(ClassLoader::string_ends_with(path, MODULES_IMAGE_NAME),
"first entry must be the modules image");
} );
}
return p;
}
bool SharedPathsMiscInfo::check(jint type, const char* path) {
assert(UseSharedSpaces, "runtime only");
switch (type) {
case BOOT_PATH:
{
//
// - Archive contains boot classes only - relaxed boot path check:
// Extra path elements appended to the boot path at runtime are allowed.
//
// - Archive contains application or platform classes - strict boot path check:
// Validate the entire runtime boot path, which must be compactible
// with the dump time boot path. Appending boot path at runtime is not
// allowed.
//
// The first entry in boot path is the modules_image (guaranteed by
// ClassLoader::setup_boot_search_path()). Skip the first entry. The
// path of the runtime modules_image may be different from the dump
// time path (e.g. the JDK image is copied to a different location
// after generating the shared archive), which is acceptable. For most
// common cases, the dump time boot path might contain modules_image only.
char* runtime_boot_path = Arguments::get_sysclasspath();
char* rp = skip_first_path_entry(runtime_boot_path);
char* dp = skip_first_path_entry(path);
bool relaxed_check = !FileMapInfo::current_info()->header()->has_platform_or_app_classes();
if (dp == NULL && rp == NULL) {
break; // ok, both runtime and dump time boot paths have modules_images only
} else if (dp == NULL && rp != NULL && relaxed_check) {
break; // ok, relaxed check, runtime has extra boot append path entries
} else if (dp != NULL && rp != NULL) {
size_t num;
size_t dp_len = strlen(dp);
size_t rp_len = strlen(rp);
if (rp_len >= dp_len) {
if (relaxed_check) {
// only check the leading entries in the runtime boot path, up to
// the length of the dump time boot path
num = dp_len;
} else {
// check the full runtime boot path, must match with dump time
num = rp_len;
}
if (os::file_name_strncmp(dp, rp, num) == 0) {
// make sure it is the end of an entry in the runtime boot path
if (rp[dp_len] == '\0' || rp[dp_len] == os::path_separator()[0]) {
break; // ok, runtime and dump time paths match
}
}
}
}
// The paths are different
return fail("[BOOT classpath mismatch, actual =", runtime_boot_path);
}
break;
case NON_EXIST:
{
struct stat st;
if (os::stat(path, &st) == 0) {
// The file actually exists
// But we want it to not exist -> fail
return fail("File must not exist");
}
}
break;
case APP_PATH:
{
size_t len = strlen(path);
const char *appcp = Arguments::get_appclasspath();
assert(appcp != NULL, "NULL app classpath");
size_t appcp_len = strlen(appcp);
if (appcp_len < len) {
return fail("Run time APP classpath is shorter than the one at dump time: ", appcp);
}
// Prefix is OK: E.g., dump with -cp foo.jar, but run with -cp foo.jar:bar.jar.
if (os::file_name_strncmp(path, appcp, len) != 0) {
return fail("[APP classpath mismatch, actual: -Djava.class.path=", appcp);
}
if (appcp[len] != '\0' && appcp[len] != os::path_separator()[0]) {
return fail("Dump time APP classpath is not a proper prefix of run time APP classpath: ", appcp);
}
}
break;
default:
return fail("Corrupted archive file header");
}
return true;
}