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6653858: dynamic languages need to be able to load anonymous classes

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Low-level privileged sun.misc.Unsafe.defineAnonymousClass

Reviewed-by: kvn
This commit is contained in:
John R Rose 2008-11-12 22:33:26 -08:00
parent 015a08b3e8
commit 849e0ffb04
19 changed files with 607 additions and 37 deletions
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22
hotspot/src/share/vm/runtime/reflection.cpp
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@ -456,10 +456,32 @@ bool Reflection::verify_class_access(klassOop current_class, klassOop new_class,
return can_relax_access_check_for(current_class, new_class, classloader_only);
}
static bool under_host_klass(instanceKlass* ik, klassOop host_klass) {
DEBUG_ONLY(int inf_loop_check = 1000 * 1000 * 1000);
for (;;) {
klassOop hc = (klassOop) ik->host_klass();
if (hc == NULL) return false;
if (hc == host_klass) return true;
ik = instanceKlass::cast(hc);
// There's no way to make a host class loop short of patching memory.
// Therefore there cannot be a loop here unles there's another bug.
// Still, let's check for it.
assert(--inf_loop_check > 0, "no host_klass loop");
}
}
bool Reflection::can_relax_access_check_for(
klassOop accessor, klassOop accessee, bool classloader_only) {
instanceKlass* accessor_ik = instanceKlass::cast(accessor);
instanceKlass* accessee_ik = instanceKlass::cast(accessee);
// If either is on the other's host_klass chain, access is OK,
// because one is inside the other.
if (under_host_klass(accessor_ik, accessee) ||
under_host_klass(accessee_ik, accessor))
return true;
if (RelaxAccessControlCheck ||
(accessor_ik->major_version() < JAVA_1_5_VERSION &&
accessee_ik->major_version() < JAVA_1_5_VERSION)) {