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8259070: Add jcmd option to dump CDS

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Reviewed-by: ccheung, iklam, mli
This commit is contained in:
Yumin Qi 2021-04-15 05:21:24 +00:00
parent 593194864a
commit e7cbeba866
23 changed files with 800 additions and 75 deletions
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66
src/hotspot/share/oops/instanceKlass.cpp
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@ -3672,7 +3672,7 @@ const char* InstanceKlass::internal_name() const {
void InstanceKlass::print_class_load_logging(ClassLoaderData* loader_data,
const ModuleEntry* module_entry,
const ClassFileStream* cfs) const {
log_to_classlist(cfs);
log_to_classlist();
if (!log_is_enabled(Info, class, load)) {
return;
@ -4265,53 +4265,37 @@ unsigned char * InstanceKlass::get_cached_class_file_bytes() {
}
#endif
void InstanceKlass::log_to_classlist(const ClassFileStream* stream) const {
bool InstanceKlass::is_shareable() const {
#if INCLUDE_CDS
ClassLoaderData* loader_data = class_loader_data();
if (!SystemDictionaryShared::is_sharing_possible(loader_data)) {
return false;
}
if (is_hidden() || unsafe_anonymous_host() != NULL) {
return false;
}
if (module()->is_patched()) {
return false;
}
return true;
#else
return false;
#endif
}
void InstanceKlass::log_to_classlist() const {
#if INCLUDE_CDS
ResourceMark rm;
if (ClassListWriter::is_enabled()) {
if (!ClassLoader::has_jrt_entry()) {
warning("DumpLoadedClassList and CDS are not supported in exploded build");
DumpLoadedClassList = NULL;
return;
}
ClassLoaderData* loader_data = class_loader_data();
if (!SystemDictionaryShared::is_sharing_possible(loader_data)) {
return;
}
bool skip = false;
if (is_shared()) {
assert(stream == NULL, "shared class with stream");
if (is_hidden()) {
// Don't include archived lambda proxy class in the classlist.
assert(!is_non_strong_hidden(), "unexpected non-strong hidden class");
return;
}
} else {
assert(stream != NULL, "non-shared class without stream");
// skip hidden class and unsafe anonymous class.
if ( is_hidden() || unsafe_anonymous_host() != NULL) {
return;
}
oop class_loader = loader_data->class_loader();
if (class_loader == NULL || SystemDictionary::is_platform_class_loader(class_loader)) {
// For the boot and platform class loaders, skip classes that are not found in the
// java runtime image, such as those found in the --patch-module entries.
// These classes can't be loaded from the archive during runtime.
if (!stream->from_boot_loader_modules_image() && strncmp(stream->source(), "jrt:", 4) != 0) {
skip = true;
}
if (class_loader == NULL && ClassLoader::contains_append_entry(stream->source())) {
// .. but don't skip the boot classes that are loaded from -Xbootclasspath/a
// as they can be loaded from the archive during runtime.
skip = false;
}
}
}
ResourceMark rm;
if (skip) {
tty->print_cr("skip writing class %s from source %s to classlist file",
name()->as_C_string(), stream->source());
} else {
if (is_shareable()) {
ClassListWriter w;
w.stream()->print_cr("%s", name()->as_C_string());
w.stream()->flush();