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8201556: Disallow reading oops in ClassLoaderData if unloading

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Move class_loader oop to an OopHandle, and assert that holder is alive when getting class_loader.

Reviewed-by: kbarrett, adinn
This commit is contained in:
Coleen Phillimore 2018-04-18 18:43:04 -04:00
parent 702ac597ad
commit ddfd4c33c6
22 changed files with 121 additions and 47 deletions
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2
src/hotspot/share/runtime/vmStructs.cpp
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@ -543,7 +543,7 @@ typedef PaddedEnd<ObjectMonitor> PaddedObjectMonitor;
/*******************/ \
/* ClassLoaderData */ \
/*******************/ \
nonstatic_field(ClassLoaderData, _class_loader, oop) \
nonstatic_field(ClassLoaderData, _class_loader, OopHandle) \
nonstatic_field(ClassLoaderData, _next, ClassLoaderData*) \
volatile_nonstatic_field(ClassLoaderData, _klasses, Klass*) \
nonstatic_field(ClassLoaderData, _is_anonymous, bool) \