bool BaselineInspector::instanceOfData(jsbytecode* pc, Shape** shape,
uint32_t* slot,
JSObject** prototypeObject) {
MOZ_ASSERT(*pc == JSOP_INSTANCEOF);
if (!hasICScript()) {
return false;
}
const ICEntry& entry = icEntryFromPC(pc);
ICStub* firstStub = entry.firstStub();
// Ensure singleton instanceof stub
if (!firstStub->next() || !firstStub->isCacheIR_Regular() ||
!firstStub->next()->isInstanceOf_Fallback() ||
firstStub->next()->toInstanceOf_Fallback()->state().hasFailures()) {
return false;
}
ICCacheIR_Regular* stub = entry.firstStub()->toCacheIR_Regular();
CacheIRReader reader(stub->stubInfo());
ObjOperandId rhsId = ObjOperandId(1);
ObjOperandId resId = ObjOperandId(2);
if (!reader.matchOp(CacheOp::GuardIsObject, rhsId)) {
return false;
}
if (!reader.matchOp(CacheOp::GuardShape, rhsId)) {
return false;
}
*shape = stub->stubInfo()->getStubField<Shape*>(stub, reader.stubOffset());
if (!reader.matchOp(CacheOp::LoadObject, resId)) {
return false;
}
*prototypeObject = stub->stubInfo()
->getStubField<JSObject*>(stub, reader.stubOffset())
.get();
if (IsInsideNursery(*prototypeObject)) {
return false;
}
if (!reader.matchOp(CacheOp::GuardFunctionPrototype, rhsId)) {
return false;
}
reader.skip(); // Skip over the protoID;
*slot = stub->stubInfo()->getStubRawWord(stub, reader.stubOffset());
return true;
}
