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7117052: instanceKlass::_init_state can be u1 type

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Change instanceKlass::_init_state field to u1 type.

Reviewed-by: bdelsart, coleenp, dholmes, phh, never
This commit is contained in:
Jiangli Zhou 2011-12-06 18:28:51 -05:00 • committed by Coleen Phillimore
parent 8e81e037e7
commit f9f4ba0203
14 changed files with 27 additions and 19 deletions
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10
hotspot/src/share/vm/oops/instanceKlass.hpp
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@ -233,7 +233,6 @@ class instanceKlass: public Klass {
u2 _minor_version; // minor version number of class file
u2 _major_version; // major version number of class file
ClassState _init_state; // state of class
Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
int _vtable_len; // length of Java vtable (in words)
int _itable_len; // length of Java itable (in words)
@ -257,6 +256,11 @@ class instanceKlass: public Klass {
JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
// Class states are defined as ClassState (see above).
// Place the _init_state here to utilize the unused 2-byte after
// _idnum_allocated_count.
u1 _init_state; // state of class
// Compact the following four boolean flags into 1-bit each. These four flags
// were defined as separate boolean fields and each was 1-byte before. Since
// there are 2 bytes unused after the _idnum_allocated_count field, place the
@ -393,7 +397,7 @@ class instanceKlass: public Klass {
bool is_being_initialized() const { return _init_state == being_initialized; }
bool is_in_error_state() const { return _init_state == initialization_error; }
bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
int get_init_state() { return _init_state; } // Useful for debugging
ClassState init_state() { return (ClassState)_init_state; }
bool is_rewritten() const { return (_misc_flags & REWRITTEN) != 0; }
// defineClass specified verification
@ -778,7 +782,7 @@ private:
#ifdef ASSERT
void set_init_state(ClassState state);
#else
void set_init_state(ClassState state) { _init_state = state; }
void set_init_state(ClassState state) { _init_state = (u1)state; }
#endif
void set_rewritten() { _misc_flags |= REWRITTEN; }
void set_init_thread(Thread *thread) { _init_thread = thread; }