/*
*breif:获取表的间接引用对象.
*param[iref]:间接引用表.
*/
Object* IndirectRefTable::get(IndirectRef iref) const {
IndirectRefKind kind = indirectRefKind(iref);
if (kind != kind_) {
if (iref == NULL) {
ALOGW("Attempt to look up NULL %s reference", indirectRefKindToString(kind_));
return kInvalidIndirectRefObject;
}
if (kind == kIndirectKindInvalid) {
ALOGE("JNI ERROR (app bug): invalid %s reference %p",
indirectRefKindToString(kind_), iref);
abortMaybe();
return kInvalidIndirectRefObject;
}
// References of the requested kind cannot appear within this table.
return kInvalidIndirectRefObject;
}
u4 topIndex = segmentState.parts.topIndex;
u4 index = extractIndex(iref);
if (index >= topIndex) {
/* bad -- stale reference? */
ALOGE("JNI ERROR (app bug): accessed stale %s reference %p (index %d in a table of size %d)",
indirectRefKindToString(kind_), iref, index, topIndex);
abortMaybe();
return kInvalidIndirectRefObject;
}
Object* obj = table_[index].obj;
if (obj == NULL) {
ALOGI("JNI ERROR (app bug): accessed deleted %s reference %p",
indirectRefKindToString(kind_), iref);
abortMaybe();
return kInvalidIndirectRefObject;
}
u4 serial = extractSerial(iref);
if (serial != table_[index].serial) {
ALOGE("JNI ERROR (app bug): attempt to use stale %s reference %p",
indirectRefKindToString(kind_), iref);
abortMaybe();
return kInvalidIndirectRefObject;
}
return obj;
}
/*
* Make sure that the entry at "idx" is correctly paired with "iref".
*/
bool IndirectRefTable::checkEntry(const char* what, IndirectRef iref, int idx) const
{
Object* obj = table_[idx];
IndirectRef checkRef = toIndirectRef(obj, idx);
if (checkRef != iref) {
LOGE("JNI ERROR (app bug): attempt to %s stale %s reference %p (should be %p)",
what, indirectRefKindToString(kind_), iref, checkRef);
abortMaybe();
return false;
}
return true;
}
/*
* Verify that the indirect table lookup is valid.
*
* Returns "false" if something looks bad.
*/
bool IndirectRefTable::getChecked(IndirectRef iref) const
{
if (iref == NULL) {
LOGW("Attempt to look up NULL %s reference", indirectRefKindToString(kind_));
return false;
}
if (indirectRefKind(iref) == kIndirectKindInvalid) {
LOGE("JNI ERROR (app bug): invalid %s reference %p",
indirectRefKindToString(kind_), iref);
abortMaybe();
return false;
}
int topIndex = segmentState.parts.topIndex;
int idx = extractIndex(iref);
if (idx >= topIndex) {
/* bad -- stale reference? */
LOGE("JNI ERROR (app bug): accessed stale %s reference %p (index %d in a table of size %d)",
indirectRefKindToString(kind_), iref, idx, topIndex);
abortMaybe();
return false;
}
if (table_[idx] == NULL) {
LOGI("JNI ERROR (app bug): accessed deleted %s reference %p",
indirectRefKindToString(kind_), iref);
abortMaybe();
return false;
}
if (!checkEntry("use", iref, idx)) {
return false;
}
return true;
}
