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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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4
src/hotspot/share/classfile/systemDictionary.cpp
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@ -2226,12 +2226,14 @@ bool SystemDictionary::add_loader_constraint(Symbol* class_name,
ClassLoaderData* loader_data2 = class_loader_data(class_loader2);
Symbol* constraint_name = NULL;
// Needs to be in same scope as constraint_name in case a Symbol is created and
// assigned to constraint_name.
FieldArrayInfo fd;
if (!FieldType::is_array(class_name)) {
constraint_name = class_name;
} else {
// For array classes, their Klass*s are not kept in the
// constraint table. The element classes are.
FieldArrayInfo fd;
BasicType t = FieldType::get_array_info(class_name, fd, CHECK_(false));
// primitive types always pass
if (t != T_OBJECT) {