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8000740: remove LinkWellKnownClasses

Browse source 
Reviewed-by: kvn, jrose
This commit is contained in:
Christian Thalinger 2012-10-11 14:46:20 -07:00
parent 74ea92ce42
commit 222b2457ed
6 changed files with 57 additions and 155 deletions
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7
hotspot/src/share/vm/classfile/classFileParser.cpp
View file

@ -816,9 +816,6 @@ Array<Klass*>* ClassFileParser::parse_interfaces(constantPoolHandle cp,
unresolved_klass, class_loader, protection_domain, unresolved_klass, class_loader, protection_domain,
false, CHECK_NULL); false, CHECK_NULL);
interf = KlassHandle(THREAD, k); interf = KlassHandle(THREAD, k);
if (LinkWellKnownClasses) // my super type is well known to me
cp->klass_at_put(interface_index, interf()); // eagerly resolve
} }
if (!Klass::cast(interf())->is_interface()) { if (!Klass::cast(interf())->is_interface()) {
@ -3197,8 +3194,6 @@ instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
KlassHandle kh (THREAD, k); KlassHandle kh (THREAD, k);
super_klass = instanceKlassHandle(THREAD, kh()); super_klass = instanceKlassHandle(THREAD, kh());
if (LinkWellKnownClasses) // my super class is well known to me
cp->klass_at_put(super_class_index, super_klass()); // eagerly resolve
} }
if (super_klass.not_null()) { if (super_klass.not_null()) {
if (super_klass->is_interface()) { if (super_klass->is_interface()) {
@ -3644,7 +3639,7 @@ instanceKlassHandle ClassFileParser::parseClassFile(Symbol* name,
// has to be changed accordingly. // has to be changed accordingly.
this_klass->set_initial_method_idnum(methods->length()); this_klass->set_initial_method_idnum(methods->length());
this_klass->set_name(cp->klass_name_at(this_class_index)); this_klass->set_name(cp->klass_name_at(this_class_index));
if (LinkWellKnownClasses || is_anonymous()) // I am well known to myself if (is_anonymous()) // I am well known to myself
cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve cp->klass_at_put(this_class_index, this_klass()); // eagerly resolve
if (fields_annotations != NULL || if (fields_annotations != NULL ||

2
hotspot/src/share/vm/classfile/classFileParser.hpp
View file

@ -344,7 +344,7 @@ class ClassFileParser VALUE_OBJ_CLASS_SPEC {
// constant pool construction, but in later versions they can. // constant pool construction, but in later versions they can.
// %%% Let's phase out the old is_klass_reference. // %%% Let's phase out the old is_klass_reference.
bool is_klass_reference(constantPoolHandle cp, int index) { bool is_klass_reference(constantPoolHandle cp, int index) {
return ((LinkWellKnownClasses || EnableInvokeDynamic) return (EnableInvokeDynamic
? cp->tag_at(index).is_klass_or_reference() ? cp->tag_at(index).is_klass_or_reference()
: cp->tag_at(index).is_klass_reference()); : cp->tag_at(index).is_klass_reference());
} }

76
hotspot/src/share/vm/classfile/systemDictionary.cpp
View file

@ -291,16 +291,6 @@ Klass* SystemDictionary::resolve_super_or_fail(Symbol* child_name,
Handle protection_domain, Handle protection_domain,
bool is_superclass, bool is_superclass,
TRAPS) { TRAPS) {
// Try to get one of the well-known klasses.
// They are trusted, and do not participate in circularities.
if (LinkWellKnownClasses) {
Klass* k = find_well_known_klass(class_name);
if (k != NULL) {
return k;
}
}
// Double-check, if child class is already loaded, just return super-class,interface // Double-check, if child class is already loaded, just return super-class,interface
// Don't add a placedholder if already loaded, i.e. already in system dictionary // Don't add a placedholder if already loaded, i.e. already in system dictionary
// Make sure there's a placeholder for the *child* before resolving. // Make sure there's a placeholder for the *child* before resolving.
@ -926,14 +916,6 @@ Klass* SystemDictionary::find_instance_or_array_klass(Symbol* class_name,
Klass* k = NULL; Klass* k = NULL;
assert(class_name != NULL, "class name must be non NULL"); assert(class_name != NULL, "class name must be non NULL");
// Try to get one of the well-known klasses.
if (LinkWellKnownClasses) {
k = find_well_known_klass(class_name);
if (k != NULL) {
return k;
}
}
if (FieldType::is_array(class_name)) { if (FieldType::is_array(class_name)) {
// The name refers to an array. Parse the name. // The name refers to an array. Parse the name.
// dimension and object_key in FieldArrayInfo are assigned as a // dimension and object_key in FieldArrayInfo are assigned as a
@ -954,41 +936,6 @@ Klass* SystemDictionary::find_instance_or_array_klass(Symbol* class_name,
return k; return k;
} }
// Quick range check for names of well-known classes:
static Symbol* wk_klass_name_limits[2] = {NULL, NULL};
#ifndef PRODUCT
static int find_wkk_calls, find_wkk_probes, find_wkk_wins;
// counts for "hello world": 3983, 1616, 1075
// => 60% hit after limit guard, 25% total win rate
#endif
Klass* SystemDictionary::find_well_known_klass(Symbol* class_name) {
// A bounds-check on class_name will quickly get a negative result.
NOT_PRODUCT(find_wkk_calls++);
if (class_name >= wk_klass_name_limits[0] &&
class_name <= wk_klass_name_limits[1]) {
NOT_PRODUCT(find_wkk_probes++);
vmSymbols::SID sid = vmSymbols::find_sid(class_name);
if (sid != vmSymbols::NO_SID) {
Klass* k = NULL;
switch (sid) {
#define WK_KLASS_CASE(name, symbol, option) \
case vmSymbols::VM_SYMBOL_ENUM_NAME(symbol): \
if (option == Pre_Link) { \
k = WK_KLASS(name); \
} \
break;
WK_KLASSES_DO(WK_KLASS_CASE)
#undef WK_KLASS_CASE
}
NOT_PRODUCT(if (k != NULL) find_wkk_wins++);
return k;
}
}
return NULL;
}
// Note: this method is much like resolve_from_stream, but // Note: this method is much like resolve_from_stream, but
// updates no supplemental data structures. // updates no supplemental data structures.
// TODO consolidate the two methods with a helper routine? // TODO consolidate the two methods with a helper routine?
@ -1942,33 +1889,12 @@ void SystemDictionary::initialize_wk_klasses_until(WKID limit_id, WKID &start_id
int opt = (info & right_n_bits(CEIL_LG_OPTION_LIMIT)); int opt = (info & right_n_bits(CEIL_LG_OPTION_LIMIT));
initialize_wk_klass((WKID)id, opt, CHECK); initialize_wk_klass((WKID)id, opt, CHECK);
// Update limits, so find_well_known_klass can be very fast:
Symbol* s = vmSymbols::symbol_at((vmSymbols::SID)sid);
if (wk_klass_name_limits[1] == NULL) {
wk_klass_name_limits[0] = wk_klass_name_limits[1] = s;
} else if (wk_klass_name_limits[1] < s) {
wk_klass_name_limits[1] = s;
} else if (wk_klass_name_limits[0] > s) {
wk_klass_name_limits[0] = s;
}
} }
// move the starting value forward to the limit: // move the starting value forward to the limit:
start_id = limit_id; start_id = limit_id;
} }
#ifdef ASSERT
void SystemDictionary::check_wk_pre_link_klasses() {
#define WK_KLASS_CHECK(name, symbol, option) \
if (option == Pre_Link) { \
assert(name()->is_public(), ""); \
}
WK_KLASSES_DO(WK_KLASS_CHECK);
#undef WK_KLASS_CHECK
}
#endif
void SystemDictionary::initialize_preloaded_classes(TRAPS) { void SystemDictionary::initialize_preloaded_classes(TRAPS) {
assert(WK_KLASS(Object_klass) == NULL, "preloaded classes should only be initialized once"); assert(WK_KLASS(Object_klass) == NULL, "preloaded classes should only be initialized once");
// Preload commonly used klasses // Preload commonly used klasses
@ -2023,8 +1949,6 @@ void SystemDictionary::initialize_preloaded_classes(TRAPS) {
initialize_wk_klasses_until(WKID_LIMIT, scan, CHECK); initialize_wk_klasses_until(WKID_LIMIT, scan, CHECK);
check_wk_pre_link_klasses();
_box_klasses[T_BOOLEAN] = WK_KLASS(Boolean_klass); _box_klasses[T_BOOLEAN] = WK_KLASS(Boolean_klass);
_box_klasses[T_CHAR] = WK_KLASS(Character_klass); _box_klasses[T_CHAR] = WK_KLASS(Character_klass);
_box_klasses[T_FLOAT] = WK_KLASS(Float_klass); _box_klasses[T_FLOAT] = WK_KLASS(Float_klass);

115
hotspot/src/share/vm/classfile/systemDictionary.hpp
View file

@ -94,45 +94,45 @@ class SymbolPropertyTable;
#define WK_KLASSES_DO(do_klass) \ #define WK_KLASSES_DO(do_klass) \
/* well-known classes */ \ /* well-known classes */ \
do_klass(Object_klass, java_lang_Object, Pre_Link ) \ do_klass(Object_klass, java_lang_Object, Pre ) \
do_klass(String_klass, java_lang_String, Pre_Link ) \ do_klass(String_klass, java_lang_String, Pre ) \
do_klass(Class_klass, java_lang_Class, Pre_Link ) \ do_klass(Class_klass, java_lang_Class, Pre ) \
do_klass(Cloneable_klass, java_lang_Cloneable, Pre_Link ) \ do_klass(Cloneable_klass, java_lang_Cloneable, Pre ) \
do_klass(ClassLoader_klass, java_lang_ClassLoader, Pre_Link ) \ do_klass(ClassLoader_klass, java_lang_ClassLoader, Pre ) \
do_klass(Serializable_klass, java_io_Serializable, Pre_Link ) \ do_klass(Serializable_klass, java_io_Serializable, Pre ) \
do_klass(System_klass, java_lang_System, Pre_Link ) \ do_klass(System_klass, java_lang_System, Pre ) \
do_klass(Throwable_klass, java_lang_Throwable, Pre_Link ) \ do_klass(Throwable_klass, java_lang_Throwable, Pre ) \
do_klass(Error_klass, java_lang_Error, Pre_Link ) \ do_klass(Error_klass, java_lang_Error, Pre ) \
do_klass(ThreadDeath_klass, java_lang_ThreadDeath, Pre_Link ) \ do_klass(ThreadDeath_klass, java_lang_ThreadDeath, Pre ) \
do_klass(Exception_klass, java_lang_Exception, Pre_Link ) \ do_klass(Exception_klass, java_lang_Exception, Pre ) \
do_klass(RuntimeException_klass, java_lang_RuntimeException, Pre_Link ) \ do_klass(RuntimeException_klass, java_lang_RuntimeException, Pre ) \
do_klass(ProtectionDomain_klass, java_security_ProtectionDomain, Pre_Link ) \ do_klass(ProtectionDomain_klass, java_security_ProtectionDomain, Pre ) \
do_klass(AccessControlContext_klass, java_security_AccessControlContext, Pre_Link ) \ do_klass(AccessControlContext_klass, java_security_AccessControlContext, Pre ) \
do_klass(ClassNotFoundException_klass, java_lang_ClassNotFoundException, Pre_Link ) \ do_klass(ClassNotFoundException_klass, java_lang_ClassNotFoundException, Pre ) \
do_klass(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre_Link ) \ do_klass(NoClassDefFoundError_klass, java_lang_NoClassDefFoundError, Pre ) \
do_klass(LinkageError_klass, java_lang_LinkageError, Pre_Link ) \ do_klass(LinkageError_klass, java_lang_LinkageError, Pre ) \
do_klass(ClassCastException_klass, java_lang_ClassCastException, Pre_Link ) \ do_klass(ClassCastException_klass, java_lang_ClassCastException, Pre ) \
do_klass(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre_Link ) \ do_klass(ArrayStoreException_klass, java_lang_ArrayStoreException, Pre ) \
do_klass(VirtualMachineError_klass, java_lang_VirtualMachineError, Pre_Link ) \ do_klass(VirtualMachineError_klass, java_lang_VirtualMachineError, Pre ) \
do_klass(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre_Link ) \ do_klass(OutOfMemoryError_klass, java_lang_OutOfMemoryError, Pre ) \
do_klass(StackOverflowError_klass, java_lang_StackOverflowError, Pre_Link ) \ do_klass(StackOverflowError_klass, java_lang_StackOverflowError, Pre ) \
do_klass(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre_Link ) \ do_klass(IllegalMonitorStateException_klass, java_lang_IllegalMonitorStateException, Pre ) \
do_klass(Reference_klass, java_lang_ref_Reference, Pre_Link ) \ do_klass(Reference_klass, java_lang_ref_Reference, Pre ) \
\ \
/* Preload ref klasses and set reference types */ \ /* Preload ref klasses and set reference types */ \
do_klass(SoftReference_klass, java_lang_ref_SoftReference, Pre_Link ) \ do_klass(SoftReference_klass, java_lang_ref_SoftReference, Pre ) \
do_klass(WeakReference_klass, java_lang_ref_WeakReference, Pre_Link ) \ do_klass(WeakReference_klass, java_lang_ref_WeakReference, Pre ) \
do_klass(FinalReference_klass, java_lang_ref_FinalReference, Pre ) \ do_klass(FinalReference_klass, java_lang_ref_FinalReference, Pre ) \
do_klass(PhantomReference_klass, java_lang_ref_PhantomReference, Pre_Link ) \ do_klass(PhantomReference_klass, java_lang_ref_PhantomReference, Pre ) \
do_klass(Finalizer_klass, java_lang_ref_Finalizer, Pre ) \ do_klass(Finalizer_klass, java_lang_ref_Finalizer, Pre ) \
\ \
do_klass(Thread_klass, java_lang_Thread, Pre_Link ) \ do_klass(Thread_klass, java_lang_Thread, Pre ) \
do_klass(ThreadGroup_klass, java_lang_ThreadGroup, Pre_Link ) \ do_klass(ThreadGroup_klass, java_lang_ThreadGroup, Pre ) \
do_klass(Properties_klass, java_util_Properties, Pre_Link ) \ do_klass(Properties_klass, java_util_Properties, Pre ) \
do_klass(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject, Pre_Link ) \ do_klass(reflect_AccessibleObject_klass, java_lang_reflect_AccessibleObject, Pre ) \
do_klass(reflect_Field_klass, java_lang_reflect_Field, Pre_Link ) \ do_klass(reflect_Field_klass, java_lang_reflect_Field, Pre ) \
do_klass(reflect_Method_klass, java_lang_reflect_Method, Pre_Link ) \ do_klass(reflect_Method_klass, java_lang_reflect_Method, Pre ) \
do_klass(reflect_Constructor_klass, java_lang_reflect_Constructor, Pre_Link ) \ do_klass(reflect_Constructor_klass, java_lang_reflect_Constructor, Pre ) \
\ \
/* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \ /* NOTE: needed too early in bootstrapping process to have checks based on JDK version */ \
/* Universe::is_gte_jdk14x_version() is not set up by this point. */ \ /* Universe::is_gte_jdk14x_version() is not set up by this point. */ \
@ -145,20 +145,20 @@ class SymbolPropertyTable;
do_klass(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15 ) \ do_klass(reflect_UnsafeStaticFieldAccessorImpl_klass, sun_reflect_UnsafeStaticFieldAccessorImpl, Opt_Only_JDK15 ) \
\ \
/* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \ /* support for dynamic typing; it's OK if these are NULL in earlier JDKs */ \
do_klass(MethodHandle_klass, java_lang_invoke_MethodHandle, Pre_Link ) \ do_klass(MethodHandle_klass, java_lang_invoke_MethodHandle, Pre_JSR292 ) \
do_klass(MemberName_klass, java_lang_invoke_MemberName, Pre ) \ do_klass(MemberName_klass, java_lang_invoke_MemberName, Pre_JSR292 ) \
do_klass(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives, Pre ) \ do_klass(MethodHandleNatives_klass, java_lang_invoke_MethodHandleNatives, Pre_JSR292 ) \
do_klass(LambdaForm_klass, java_lang_invoke_LambdaForm, Opt ) \ do_klass(LambdaForm_klass, java_lang_invoke_LambdaForm, Opt ) \
do_klass(MethodType_klass, java_lang_invoke_MethodType, Pre_Link ) \ do_klass(MethodType_klass, java_lang_invoke_MethodType, Pre_JSR292 ) \
do_klass(BootstrapMethodError_klass, java_lang_BootstrapMethodError, Pre_Link ) \ do_klass(BootstrapMethodError_klass, java_lang_BootstrapMethodError, Pre_JSR292 ) \
do_klass(CallSite_klass, java_lang_invoke_CallSite, Pre_Link ) \ do_klass(CallSite_klass, java_lang_invoke_CallSite, Pre_JSR292 ) \
do_klass(ConstantCallSite_klass, java_lang_invoke_ConstantCallSite, Pre_Link ) \ do_klass(ConstantCallSite_klass, java_lang_invoke_ConstantCallSite, Pre_JSR292 ) \
do_klass(MutableCallSite_klass, java_lang_invoke_MutableCallSite, Pre_Link ) \ do_klass(MutableCallSite_klass, java_lang_invoke_MutableCallSite, Pre_JSR292 ) \
do_klass(VolatileCallSite_klass, java_lang_invoke_VolatileCallSite, Pre_Link ) \ do_klass(VolatileCallSite_klass, java_lang_invoke_VolatileCallSite, Pre_JSR292 ) \
/* Note: MethodHandle must be first, and VolatileCallSite last in group */ \ /* Note: MethodHandle must be first, and VolatileCallSite last in group */ \
\ \
do_klass(StringBuffer_klass, java_lang_StringBuffer, Pre_Link ) \ do_klass(StringBuffer_klass, java_lang_StringBuffer, Pre ) \
do_klass(StringBuilder_klass, java_lang_StringBuilder, Pre_Link ) \ do_klass(StringBuilder_klass, java_lang_StringBuilder, Pre ) \
\ \
/* It's NULL in non-1.4 JDKs. */ \ /* It's NULL in non-1.4 JDKs. */ \
do_klass(StackTraceElement_klass, java_lang_StackTraceElement, Opt ) \ do_klass(StackTraceElement_klass, java_lang_StackTraceElement, Opt ) \
@ -171,14 +171,14 @@ class SymbolPropertyTable;
do_klass(PostVMInitHook_klass, sun_misc_PostVMInitHook, Opt ) \ do_klass(PostVMInitHook_klass, sun_misc_PostVMInitHook, Opt ) \
\ \
/* Preload boxing klasses */ \ /* Preload boxing klasses */ \
do_klass(Boolean_klass, java_lang_Boolean, Pre_Link ) \ do_klass(Boolean_klass, java_lang_Boolean, Pre ) \
do_klass(Character_klass, java_lang_Character, Pre_Link ) \ do_klass(Character_klass, java_lang_Character, Pre ) \
do_klass(Float_klass, java_lang_Float, Pre_Link ) \ do_klass(Float_klass, java_lang_Float, Pre ) \
do_klass(Double_klass, java_lang_Double, Pre_Link ) \ do_klass(Double_klass, java_lang_Double, Pre ) \
do_klass(Byte_klass, java_lang_Byte, Pre_Link ) \ do_klass(Byte_klass, java_lang_Byte, Pre ) \
do_klass(Short_klass, java_lang_Short, Pre_Link ) \ do_klass(Short_klass, java_lang_Short, Pre ) \
do_klass(Integer_klass, java_lang_Integer, Pre_Link ) \ do_klass(Integer_klass, java_lang_Integer, Pre ) \
do_klass(Long_klass, java_lang_Long, Pre_Link ) \ do_klass(Long_klass, java_lang_Long, Pre ) \
/*end*/ /*end*/
@ -201,7 +201,7 @@ class SystemDictionary : AllStatic {
enum InitOption { enum InitOption {
Pre, // preloaded; error if not present Pre, // preloaded; error if not present
Pre_Link, // preloaded; error if not present; link as well-known Pre_JSR292, // preloaded if EnableInvokeDynamic
// Order is significant. Options before this point require resolve_or_fail. // Order is significant. Options before this point require resolve_or_fail.
// Options after this point will use resolve_or_null instead. // Options after this point will use resolve_or_null instead.
@ -280,9 +280,6 @@ public:
Handle protection_domain, Handle protection_domain,
TRAPS); TRAPS);
// If the given name is known to vmSymbols, return the well-know klass:
static Klass* find_well_known_klass(Symbol* class_name);
// Lookup an instance or array class that has already been loaded // Lookup an instance or array class that has already been loaded
// either into the given class loader, or else into another class // either into the given class loader, or else into another class
// loader that is constrained (via loader constraints) to produce // loader that is constrained (via loader constraints) to produce
@ -393,7 +390,7 @@ public:
} }
static Klass* check_klass_Pre( Klass* k) { return check_klass(k); } static Klass* check_klass_Pre( Klass* k) { return check_klass(k); }
static Klass* check_klass_Pre_Link( Klass* k) { return check_klass(k); } static Klass* check_klass_Pre_JSR292(Klass* k) { return EnableInvokeDynamic ? check_klass(k) : k; }
static Klass* check_klass_Opt( Klass* k) { return k; } static Klass* check_klass_Opt( Klass* k) { return k; }
static Klass* check_klass_Opt_Kernel(Klass* k) { return k; } //== Opt static Klass* check_klass_Opt_Kernel(Klass* k) { return k; } //== Opt
static Klass* check_klass_Opt_Only_JDK15(Klass* k) { static Klass* check_klass_Opt_Only_JDK15(Klass* k) {
@ -413,8 +410,6 @@ public:
initialize_wk_klasses_until((WKID) limit, start_id, THREAD); initialize_wk_klasses_until((WKID) limit, start_id, THREAD);
} }
static void check_wk_pre_link_klasses() NOT_DEBUG_RETURN;
public: public:
#define WK_KLASS_DECLARE(name, symbol, option) \ #define WK_KLASS_DECLARE(name, symbol, option) \
static Klass* name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } \ static Klass* name() { return check_klass_##option(_well_known_klasses[WK_KLASS_ENUM_NAME(name)]); } \

9
hotspot/src/share/vm/prims/methodHandles.cpp
View file

@ -563,15 +563,6 @@ static oop field_signature_type_or_null(Symbol* s) {
return Klass::cast(SystemDictionary::Class_klass())->java_mirror(); return Klass::cast(SystemDictionary::Class_klass())->java_mirror();
} else if (s == vmSymbols::string_signature()) { } else if (s == vmSymbols::string_signature()) {
return Klass::cast(SystemDictionary::String_klass())->java_mirror(); return Klass::cast(SystemDictionary::String_klass())->java_mirror();
} else {
int len = s->utf8_length();
if (s->byte_at(0) == 'L' && s->byte_at(len-1) == ';') {
TempNewSymbol cname = SymbolTable::probe((const char*)&s->bytes()[1], len-2);
if (cname == NULL) return NULL;
Klass* wkk = SystemDictionary::find_well_known_klass(cname);
if (wkk == NULL) return NULL;
return Klass::cast(wkk)->java_mirror();
}
} }
} }
return NULL; return NULL;

3
hotspot/src/share/vm/runtime/globals.hpp
View file

@ -1000,9 +1000,6 @@ class CommandLineFlags {
product(bool, ClassUnloading, true, \ product(bool, ClassUnloading, true, \
"Do unloading of classes") \ "Do unloading of classes") \
\ \
diagnostic(bool, LinkWellKnownClasses, true, \
"Resolve a well known class as soon as its name is seen") \
\
develop(bool, DisableStartThread, false, \ develop(bool, DisableStartThread, false, \
"Disable starting of additional Java threads " \ "Disable starting of additional Java threads " \
"(for debugging only)") \ "(for debugging only)") \