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8178543: Optimize Klass::is_shared()

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Reviewed-by: coleenp, jiangli
This commit is contained in:
Ioi Lam 2017-04-14 08:33:57 -07:00
parent e4f0dea860
commit 3e3183a5a1
4 changed files with 11 additions and 2 deletions
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2
hotspot/src/share/vm/oops/klass.cpp
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@ -497,10 +497,12 @@ void Klass::remove_unshareable_info() {
// Null out class_loader_data because we don't share that yet.
set_class_loader_data(NULL);
set_is_shared();
}
void Klass::restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS) {
assert(is_klass(), "ensure C++ vtable is restored");
assert(is_shared(), "must be set");
TRACE_RESTORE_ID(this);
// If an exception happened during CDS restore, some of these fields may already be

2
hotspot/src/share/vm/oops/klass.hpp
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@ -563,6 +563,8 @@ protected:
void set_has_vanilla_constructor() { _access_flags.set_has_vanilla_constructor(); }
bool has_miranda_methods () const { return access_flags().has_miranda_methods(); }
void set_has_miranda_methods() { _access_flags.set_has_miranda_methods(); }
bool is_shared() const { return access_flags().is_shared_class(); } // shadows MetaspaceObj::is_shared)()
void set_is_shared() { _access_flags.set_is_shared_class(); }
bool is_cloneable() const;
void set_is_cloneable();

5
hotspot/src/share/vm/oops/klassVtable.cpp
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@ -1014,15 +1014,16 @@ bool klassVtable::is_initialized() {
void itableMethodEntry::initialize(Method* m) {
if (m == NULL) return;
#ifdef ASSERT
if (MetaspaceShared::is_in_shared_space((void*)&_method) &&
!MetaspaceShared::remapped_readwrite()) {
// At runtime initialize_itable is rerun as part of link_class_impl()
// for a shared class loaded by the non-boot loader.
// The dumptime itable method entry should be the same as the runtime entry.
assert(_method == m, "sanity");
} else {
_method = m;
}
#endif
_method = m;
}
klassItable::klassItable(InstanceKlass* klass) {

4
hotspot/src/share/vm/utilities/accessFlags.hpp
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@ -64,6 +64,7 @@ enum {
JVM_ACC_HAS_FINALIZER = 0x40000000, // True if klass has a non-empty finalize() method
JVM_ACC_IS_CLONEABLE_FAST = (int)0x80000000,// True if klass implements the Cloneable interface and can be optimized in generated code
JVM_ACC_HAS_FINAL_METHOD = 0x01000000, // True if klass has final method
JVM_ACC_IS_SHARED_CLASS = 0x02000000, // True if klass is shared
// Klass* and Method* flags
JVM_ACC_HAS_LOCAL_VARIABLE_TABLE= 0x00200000,
@ -146,6 +147,8 @@ class AccessFlags VALUE_OBJ_CLASS_SPEC {
bool has_finalizer () const { return (_flags & JVM_ACC_HAS_FINALIZER ) != 0; }
bool has_final_method () const { return (_flags & JVM_ACC_HAS_FINAL_METHOD ) != 0; }
bool is_cloneable_fast () const { return (_flags & JVM_ACC_IS_CLONEABLE_FAST ) != 0; }
bool is_shared_class () const { return (_flags & JVM_ACC_IS_SHARED_CLASS ) != 0; }
// Klass* and Method* flags
bool has_localvariable_table () const { return (_flags & JVM_ACC_HAS_LOCAL_VARIABLE_TABLE) != 0; }
void set_has_localvariable_table() { atomic_set_bits(JVM_ACC_HAS_LOCAL_VARIABLE_TABLE); }
@ -216,6 +219,7 @@ class AccessFlags VALUE_OBJ_CLASS_SPEC {
void set_has_final_method() { atomic_set_bits(JVM_ACC_HAS_FINAL_METHOD); }
void set_is_cloneable_fast() { atomic_set_bits(JVM_ACC_IS_CLONEABLE_FAST); }
void set_has_miranda_methods() { atomic_set_bits(JVM_ACC_HAS_MIRANDA_METHODS); }
void set_is_shared_class() { atomic_set_bits(JVM_ACC_IS_SHARED_CLASS); }
public:
// field flags