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8199852: Print more information about class loaders in LinkageErrors

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Reviewed-by: dholmes, lfoltan, gtriantafill
This commit is contained in:
Goetz Lindenmaier 2018-05-07 11:38:21 +02:00
parent 5f40eda733
commit 72a2ac8b8b
28 changed files with 660 additions and 97 deletions
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42
src/hotspot/share/classfile/javaClasses.cpp
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@ -4134,6 +4134,48 @@ oop java_lang_ClassLoader::unnamedModule(oop loader) {
return loader->obj_field(unnamedModule_offset);
}
// Caller needs ResourceMark.
const char* java_lang_ClassLoader::describe_external(const oop loader) {
if (loader == NULL) {
return "<bootstrap>";
}
bool well_known_loader = SystemDictionary::is_system_class_loader(loader) ||
SystemDictionary::is_platform_class_loader(loader);
const char* name = NULL;
oop nameOop = java_lang_ClassLoader::name(loader);
if (nameOop != NULL) {
name = java_lang_String::as_utf8_string(nameOop);
}
if (name == NULL) {
// Use placeholder for missing name to have fixed message format.
name = "<unnamed>";
}
stringStream ss;
ss.print("\"%s\" (instance of %s", name, loader->klass()->external_name());
if (!well_known_loader) {
const char* parentName = NULL;
oop pl = java_lang_ClassLoader::parent(loader);
if (pl != NULL) {
oop parentNameOop = java_lang_ClassLoader::name(pl);
if (parentNameOop != NULL) {
parentName = java_lang_String::as_utf8_string(parentNameOop);
if (parentName == NULL) {
parentName = "<unnamed>";
}
}
ss.print(", child of \"%s\" %s", parentName, pl->klass()->external_name());
} else {
ss.print(", child of <bootstrap>");
}
}
ss.print(")");
return ss.as_string();
}
// Support for java_lang_System
//
#define SYSTEM_FIELDS_DO(macro) \