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8207359: Make SymbolTable increment_refcount disallow zero

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Use cmpxchg for non permanent symbol refcounting, and pack refcount and length into an int.

Reviewed-by: gziemski, kbarrett, iklam
This commit is contained in:
Coleen Phillimore 2018-07-20 14:52:11 -04:00
parent 6cbef1de5d
commit 39dd04b953
14 changed files with 206 additions and 64 deletions
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3
src/hotspot/share/runtime/vmStructs.cpp
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@ -330,9 +330,8 @@ typedef PaddedEnd<ObjectMonitor> PaddedObjectMonitor;
nonstatic_field(ConstMethod, _size_of_parameters, u2) \
nonstatic_field(ObjArrayKlass, _element_klass, Klass*) \
nonstatic_field(ObjArrayKlass, _bottom_klass, Klass*) \
volatile_nonstatic_field(Symbol, _refcount, short) \
volatile_nonstatic_field(Symbol, _length_and_refcount, unsigned int) \
nonstatic_field(Symbol, _identity_hash, short) \
nonstatic_field(Symbol, _length, unsigned short) \
unchecked_nonstatic_field(Symbol, _body, sizeof(jbyte)) /* NOTE: no type */ \
nonstatic_field(Symbol, _body[0], jbyte) \
nonstatic_field(TypeArrayKlass, _max_length, jint) \