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8255578: [JVMCI] be more careful about reflective reads of Class.componentType.

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Reviewed-by: kvn, dlong
This commit is contained in:
Tom Rodriguez 2020-11-02 19:19:48 +00:00
parent 05bcd67e65
commit bc6085b06c
3 changed files with 25 additions and 0 deletions
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15
src/hotspot/share/jvmci/jvmciCompilerToVM.cpp
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@ -1995,6 +1995,14 @@ C2V_VMENTRY_NULL(jobject, readFieldValue, (JNIEnv* env, jobject, jobject object,
JVMCI_THROW_MSG_NULL(IllegalArgumentException,
err_msg("Unexpected type: %s", JVMCIENV->klass_name(base)));
}
if (displacement == java_lang_Class::component_mirror_offset() && java_lang_Class::is_instance(obj()) &&
!java_lang_Class::as_Klass(obj())->is_array_klass()) {
// Class.componentType for non-array classes can transiently contain an int[] that's
// used for locking so always return null to mimic Class.getComponentType()
return JVMCIENV->get_jobject(JVMCIENV->get_JavaConstant_NULL_POINTER());
}
jlong value = 0;
JVMCIObject kind;
switch (constant_type) {
@ -2220,6 +2228,13 @@ C2V_VMENTRY_NULL(jobject, getObject, (JNIEnv* env, jobject, jobject x, long disp
JVMCI_THROW_0(NullPointerException);
}
Handle xobj = JVMCIENV->asConstant(JVMCIENV->wrap(x), JVMCI_CHECK_0);
if (displacement == java_lang_Class::component_mirror_offset() && java_lang_Class::is_instance(xobj()) &&
!java_lang_Class::as_Klass(xobj())->is_array_klass()) {
// Class.componentType for non-array classes can transiently contain an int[] that's
// used for locking so always return null to mimic Class.getComponentType()
return JVMCIENV->get_jobject(JVMCIENV->get_JavaConstant_NULL_POINTER());
}
oop res = xobj->obj_field(displacement);
JVMCIObject result = JVMCIENV->get_object_constant(res);
return JVMCIENV->get_jobject(result);