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8075253: Multiversion JAR feature: CDS does not support MV-JARs

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Handle "Multi-Release" jar during CDS dump time

Reviewed-by: jiangli, iklam, minqi, redestad
This commit is contained in:
Calvin Cheung 2016-03-31 10:42:57 -07:00
parent b1e438f157
commit c3fd09e417
3 changed files with 92 additions and 16 deletions
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93
hotspot/src/share/vm/classfile/classLoader.cpp
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@ -226,11 +226,12 @@ ClassFileStream* ClassPathDirEntry::open_stream(const char* name, TRAPS) {
return NULL;
}
ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name) : ClassPathEntry() {
ClassPathZipEntry::ClassPathZipEntry(jzfile* zip, const char* zip_name, bool is_boot_append) : ClassPathEntry() {
_zip = zip;
char *copy = NEW_C_HEAP_ARRAY(char, strlen(zip_name)+1, mtClass);
strcpy(copy, zip_name);
_zip_name = copy;
_is_boot_append = is_boot_append;
}
ClassPathZipEntry::~ClassPathZipEntry() {
@ -274,11 +275,79 @@ u1* ClassPathZipEntry::open_entry(const char* name, jint* filesize, bool nul_ter
return buffer;
}
#if INCLUDE_CDS
u1* ClassPathZipEntry::open_versioned_entry(const char* name, jint* filesize, TRAPS) {
u1* buffer = NULL;
if (!_is_boot_append) {
assert(DumpSharedSpaces, "Should be called only for non-boot entries during dump time");
// We presume default is multi-release enabled
const char* multi_ver = Arguments::get_property("jdk.util.jar.enableMultiRelease");
const char* verstr = Arguments::get_property("jdk.util.jar.version");
bool is_multi_ver = (multi_ver == NULL ||
strcmp(multi_ver, "true") == 0 ||
strcmp(multi_ver, "force") == 0) &&
is_multiple_versioned(THREAD);
// command line version setting
int version = 0;
const int base_version = 8; // JDK8
int cur_ver = JDK_Version::current().major_version();
if (verstr != NULL) {
version = atoi(verstr);
if (version < base_version || version > cur_ver) {
is_multi_ver = false;
// print out warning, do not use assertion here since it will continue to look
// for proper version.
warning("JDK%d is not supported in multiple version jars", version);
}
}
if (is_multi_ver) {
int n;
char entry_name[JVM_MAXPATHLEN];
if (version > 0) {
n = jio_snprintf(entry_name, sizeof(entry_name), "META-INF/versions/%d/%s", version, name);
entry_name[n] = '\0';
buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
if (buffer == NULL) {
warning("Could not find %s in %s, try to find highest version instead", entry_name, _zip_name);
}
}
if (buffer == NULL) {
for (int i = cur_ver; i >= base_version; i--) {
n = jio_snprintf(entry_name, sizeof(entry_name), "META-INF/versions/%d/%s", i, name);
entry_name[n] = '\0';
buffer = open_entry((const char*)entry_name, filesize, false, CHECK_NULL);
if (buffer != NULL) {
break;
}
}
}
}
}
return buffer;
}
bool ClassPathZipEntry::is_multiple_versioned(TRAPS) {
assert(DumpSharedSpaces, "called only at dump time");
jint size;
char* buffer = (char*)open_entry("META-INF/MANIFEST.MF", &size, false, CHECK_false);
if (buffer != NULL) {
if (strstr(buffer, "Multi-Release: true") != NULL) {
return true;
}
}
return false;
}
#endif // INCLUDE_CDS
ClassFileStream* ClassPathZipEntry::open_stream(const char* name, TRAPS) {
jint filesize;
const u1* buffer = open_entry(name, &filesize, false, CHECK_NULL);
u1* buffer = open_versioned_entry(name, &filesize, CHECK_NULL);
if (buffer == NULL) {
return NULL;
buffer = open_entry(name, &filesize, false, CHECK_NULL);
if (buffer == NULL) {
return NULL;
}
}
if (UsePerfData) {
ClassLoader::perf_sys_classfile_bytes_read()->inc(filesize);
@ -558,7 +627,7 @@ void ClassLoader::setup_search_path(const char *class_path, bool bootstrap_searc
char* path = NEW_RESOURCE_ARRAY(char, end - start + 1);
strncpy(path, &class_path[start], end - start);
path[end - start] = '\0';
update_class_path_entry_list(path, false, mark_append_entry, false);
update_class_path_entry_list(path, false, mark_append_entry, false, bootstrap_search);
// Check on the state of the boot loader's append path
if (mark_append_entry && (_first_append_entry == NULL)) {
@ -582,7 +651,8 @@ void ClassLoader::setup_search_path(const char *class_path, bool bootstrap_searc
}
ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const struct stat* st,
bool throw_exception, TRAPS) {
bool throw_exception,
bool is_boot_append, TRAPS) {
JavaThread* thread = JavaThread::current();
ClassPathEntry* new_entry = NULL;
if ((st->st_mode & S_IFREG) == S_IFREG) {
@ -611,7 +681,7 @@ ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const str
zip = (*ZipOpen)(canonical_path, &error_msg);
}
if (zip != NULL && error_msg == NULL) {
new_entry = new ClassPathZipEntry(zip, path);
new_entry = new ClassPathZipEntry(zip, path, is_boot_append);
} else {
ResourceMark rm(thread);
char *msg;
@ -644,7 +714,7 @@ ClassPathEntry* ClassLoader::create_class_path_entry(const char *path, const str
// Create a class path zip entry for a given path (return NULL if not found
// or zip/JAR file cannot be opened)
ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path) {
ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path, bool is_boot_append) {
// check for a regular file
struct stat st;
if (os::stat(path, &st) == 0) {
@ -662,7 +732,7 @@ ClassPathZipEntry* ClassLoader::create_class_path_zip_entry(const char *path) {
}
if (zip != NULL && error_msg == NULL) {
// create using canonical path
return new ClassPathZipEntry(zip, canonical_path);
return new ClassPathZipEntry(zip, canonical_path, is_boot_append);
}
}
}
@ -720,11 +790,11 @@ void ClassLoader::prepend_to_list(ClassPathEntry *new_entry) {
}
void ClassLoader::add_to_list(const char *apath) {
update_class_path_entry_list((char*)apath, false, false, false);
update_class_path_entry_list((char*)apath, false, false, false, false);
}
void ClassLoader::prepend_to_list(const char *apath) {
update_class_path_entry_list((char*)apath, false, false, true);
update_class_path_entry_list((char*)apath, false, false, true, false);
}
// Returns true IFF the file/dir exists and the entry was successfully created.
@ -732,13 +802,14 @@ bool ClassLoader::update_class_path_entry_list(const char *path,
bool check_for_duplicates,
bool mark_append_entry,
bool prepend_entry,
bool is_boot_append,
bool throw_exception) {
struct stat st;
if (os::stat(path, &st) == 0) {
// File or directory found
ClassPathEntry* new_entry = NULL;
Thread* THREAD = Thread::current();
new_entry = create_class_path_entry(path, &st, throw_exception, CHECK_(false));
new_entry = create_class_path_entry(path, &st, throw_exception, is_boot_append, CHECK_(false));
if (new_entry == NULL) {
return false;
}