30 #include "classfile/javaClasses.inline.hpp"
31 #include "classfile/stringTable.hpp"
32 #include "classfile/vmClasses.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "code/aotCodeCache.hpp"
35 #include "code/codeCache.hpp"
36 #include "code/compiledIC.hpp"
37 #include "code/nmethod.inline.hpp"
38 #include "code/scopeDesc.hpp"
39 #include "code/vtableStubs.hpp"
40 #include "compiler/abstractCompiler.hpp"
41 #include "compiler/compileBroker.hpp"
42 #include "compiler/disassembler.hpp"
43 #include "gc/shared/barrierSet.hpp"
44 #include "gc/shared/collectedHeap.hpp"
45 #include "interpreter/interpreter.hpp"
46 #include "interpreter/interpreterRuntime.hpp"
47 #include "jfr/jfrEvents.hpp"
48 #include "jvm.h"
49 #include "logging/log.hpp"
50 #include "memory/resourceArea.hpp"
51 #include "memory/universe.hpp"
52 #include "metaprogramming/primitiveConversions.hpp"
53 #include "oops/klass.hpp"
54 #include "oops/method.inline.hpp"
55 #include "oops/objArrayKlass.hpp"
56 #include "oops/oop.inline.hpp"
57 #include "prims/forte.hpp"
58 #include "prims/jvmtiExport.hpp"
59 #include "prims/jvmtiThreadState.hpp"
60 #include "prims/methodHandles.hpp"
61 #include "prims/nativeLookup.hpp"
62 #include "runtime/arguments.hpp"
63 #include "runtime/atomicAccess.hpp"
64 #include "runtime/basicLock.inline.hpp"
65 #include "runtime/frame.inline.hpp"
66 #include "runtime/handles.inline.hpp"
67 #include "runtime/init.hpp"
68 #include "runtime/interfaceSupport.inline.hpp"
69 #include "runtime/java.hpp"
70 #include "runtime/javaCalls.hpp"
71 #include "runtime/jniHandles.inline.hpp"
72 #include "runtime/osThread.hpp"
73 #include "runtime/perfData.hpp"
74 #include "runtime/sharedRuntime.hpp"
75 #include "runtime/stackWatermarkSet.hpp"
76 #include "runtime/stubRoutines.hpp"
77 #include "runtime/synchronizer.hpp"
78 #include "runtime/timerTrace.hpp"
79 #include "runtime/vframe.inline.hpp"
80 #include "runtime/vframeArray.hpp"
81 #include "runtime/vm_version.hpp"
82 #include "utilities/copy.hpp"
83 #include "utilities/dtrace.hpp"
84 #include "utilities/events.hpp"
85 #include "utilities/globalDefinitions.hpp"
86 #include "utilities/hashTable.hpp"
87 #include "utilities/macros.hpp"
88 #include "utilities/xmlstream.hpp"
89 #ifdef COMPILER1
90 #include "c1/c1_Runtime1.hpp"
91 #endif
92 #ifdef COMPILER2
93 #include "opto/runtime.hpp"
94 #endif
1212 // for a call current in progress, i.e., arguments has been pushed on stack
1213 // but callee has not been invoked yet. Caller frame must be compiled.
1214 Handle SharedRuntime::find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc,
1215 CallInfo& callinfo, TRAPS) {
1216 Handle receiver;
1217 Handle nullHandle; // create a handy null handle for exception returns
1218 JavaThread* current = THREAD;
1219
1220 assert(!vfst.at_end(), "Java frame must exist");
1221
1222 // Find caller and bci from vframe
1223 methodHandle caller(current, vfst.method());
1224 int bci = vfst.bci();
1225
1226 if (caller->is_continuation_enter_intrinsic()) {
1227 bc = Bytecodes::_invokestatic;
1228 LinkResolver::resolve_continuation_enter(callinfo, CHECK_NH);
1229 return receiver;
1230 }
1231
1232 Bytecode_invoke bytecode(caller, bci);
1233 int bytecode_index = bytecode.index();
1234 bc = bytecode.invoke_code();
1235
1236 methodHandle attached_method(current, extract_attached_method(vfst));
1237 if (attached_method.not_null()) {
1238 Method* callee = bytecode.static_target(CHECK_NH);
1239 vmIntrinsics::ID id = callee->intrinsic_id();
1240 // When VM replaces MH.invokeBasic/linkTo* call with a direct/virtual call,
1241 // it attaches statically resolved method to the call site.
1242 if (MethodHandles::is_signature_polymorphic(id) &&
1243 MethodHandles::is_signature_polymorphic_intrinsic(id)) {
1244 bc = MethodHandles::signature_polymorphic_intrinsic_bytecode(id);
1245
1246 // Adjust invocation mode according to the attached method.
1247 switch (bc) {
1248 case Bytecodes::_invokevirtual:
1249 if (attached_method->method_holder()->is_interface()) {
1250 bc = Bytecodes::_invokeinterface;
1251 }
1252 break;
1253 case Bytecodes::_invokeinterface:
1254 if (!attached_method->method_holder()->is_interface()) {
1255 bc = Bytecodes::_invokevirtual;
1256 }
1257 break;
1258 case Bytecodes::_invokehandle:
1259 if (!MethodHandles::is_signature_polymorphic_method(attached_method())) {
1260 bc = attached_method->is_static() ? Bytecodes::_invokestatic
1261 : Bytecodes::_invokevirtual;
1262 }
1263 break;
1264 default:
1265 break;
1266 }
1267 }
1268 }
1269
1270 assert(bc != Bytecodes::_illegal, "not initialized");
1271
1272 bool has_receiver = bc != Bytecodes::_invokestatic &&
1273 bc != Bytecodes::_invokedynamic &&
1274 bc != Bytecodes::_invokehandle;
1275
1276 // Find receiver for non-static call
1277 if (has_receiver) {
1278 // This register map must be update since we need to find the receiver for
1279 // compiled frames. The receiver might be in a register.
1280 RegisterMap reg_map2(current,
1281 RegisterMap::UpdateMap::include,
1282 RegisterMap::ProcessFrames::include,
1283 RegisterMap::WalkContinuation::skip);
1284 frame stubFrame = current->last_frame();
1285 // Caller-frame is a compiled frame
1286 frame callerFrame = stubFrame.sender(®_map2);
1287
1288 if (attached_method.is_null()) {
1289 Method* callee = bytecode.static_target(CHECK_NH);
1290 if (callee == nullptr) {
1291 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle);
1292 }
1293 }
1294
1295 // Retrieve from a compiled argument list
1296 receiver = Handle(current, callerFrame.retrieve_receiver(®_map2));
1297 assert(oopDesc::is_oop_or_null(receiver()), "");
1298
1299 if (receiver.is_null()) {
1300 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle);
1301 }
1302 }
1303
1304 // Resolve method
1305 if (attached_method.not_null()) {
1306 // Parameterized by attached method.
1307 LinkResolver::resolve_invoke(callinfo, receiver, attached_method, bc, CHECK_NH);
1308 } else {
1309 // Parameterized by bytecode.
1310 constantPoolHandle constants(current, caller->constants());
1311 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_NH);
1312 }
1313
1314 #ifdef ASSERT
1315 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls
1316 if (has_receiver) {
1317 assert(receiver.not_null(), "should have thrown exception");
1318 Klass* receiver_klass = receiver->klass();
1319 Klass* rk = nullptr;
1320 if (attached_method.not_null()) {
1321 // In case there's resolved method attached, use its holder during the check.
1322 rk = attached_method->method_holder();
1323 } else {
1324 // Klass is already loaded.
1325 constantPoolHandle constants(current, caller->constants());
1326 rk = constants->klass_ref_at(bytecode_index, bc, CHECK_NH);
1327 }
1328 Klass* static_receiver_klass = rk;
1329 assert(receiver_klass->is_subtype_of(static_receiver_klass),
1330 "actual receiver must be subclass of static receiver klass");
1331 if (receiver_klass->is_instance_klass()) {
1332 if (InstanceKlass::cast(receiver_klass)->is_not_initialized()) {
1333 tty->print_cr("ERROR: Klass not yet initialized!!");
1334 receiver_klass->print();
1335 }
1336 assert(!InstanceKlass::cast(receiver_klass)->is_not_initialized(), "receiver_klass must be initialized");
1337 }
1338 }
1339 #endif
1340
1341 return receiver;
1342 }
1343
1344 methodHandle SharedRuntime::find_callee_method(TRAPS) {
1345 JavaThread* current = THREAD;
1346 ResourceMark rm(current);
1347 // We need first to check if any Java activations (compiled, interpreted)
1348 // exist on the stack since last JavaCall. If not, we need
1349 // to get the target method from the JavaCall wrapper.
1350 vframeStream vfst(current, true); // Do not skip any javaCalls
1351 methodHandle callee_method;
1352 if (vfst.at_end()) {
1353 // No Java frames were found on stack since we did the JavaCall.
1354 // Hence the stack can only contain an entry_frame. We need to
1355 // find the target method from the stub frame.
1356 RegisterMap reg_map(current,
1357 RegisterMap::UpdateMap::skip,
1358 RegisterMap::ProcessFrames::include,
1359 RegisterMap::WalkContinuation::skip);
1360 frame fr = current->last_frame();
1361 assert(fr.is_runtime_frame(), "must be a runtimeStub");
1362 fr = fr.sender(®_map);
1363 assert(fr.is_entry_frame(), "must be");
1364 // fr is now pointing to the entry frame.
1365 callee_method = methodHandle(current, fr.entry_frame_call_wrapper()->callee_method());
1366 } else {
1367 Bytecodes::Code bc;
1368 CallInfo callinfo;
1369 find_callee_info_helper(vfst, bc, callinfo, CHECK_(methodHandle()));
1370 callee_method = methodHandle(current, callinfo.selected_method());
1371 }
1372 assert(callee_method()->is_method(), "must be");
1373 return callee_method;
1374 }
1375
1376 // Resolves a call.
1377 methodHandle SharedRuntime::resolve_helper(bool is_virtual, bool is_optimized, TRAPS) {
1378 JavaThread* current = THREAD;
1379 ResourceMark rm(current);
1380 RegisterMap cbl_map(current,
1381 RegisterMap::UpdateMap::skip,
1382 RegisterMap::ProcessFrames::include,
1383 RegisterMap::WalkContinuation::skip);
1384 frame caller_frame = current->last_frame().sender(&cbl_map);
1385
1386 CodeBlob* caller_cb = caller_frame.cb();
1387 guarantee(caller_cb != nullptr && caller_cb->is_nmethod(), "must be called from compiled method");
1388 nmethod* caller_nm = caller_cb->as_nmethod();
1389
1390 // determine call info & receiver
1391 // note: a) receiver is null for static calls
1392 // b) an exception is thrown if receiver is null for non-static calls
1393 CallInfo call_info;
1394 Bytecodes::Code invoke_code = Bytecodes::_illegal;
1395 Handle receiver = find_callee_info(invoke_code, call_info, CHECK_(methodHandle()));
1396
1397 NoSafepointVerifier nsv;
1398
1399 methodHandle callee_method(current, call_info.selected_method());
1400
1401 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic ) ||
1402 (!is_virtual && invoke_code == Bytecodes::_invokespecial) ||
1403 (!is_virtual && invoke_code == Bytecodes::_invokehandle ) ||
1404 (!is_virtual && invoke_code == Bytecodes::_invokedynamic) ||
1405 ( is_virtual && invoke_code != Bytecodes::_invokestatic ), "inconsistent bytecode");
1406
1407 assert(!caller_nm->is_unloading(), "It should not be unloading");
1408
1409 #ifndef PRODUCT
1410 // tracing/debugging/statistics
1411 uint *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) :
1412 (is_virtual) ? (&_resolve_virtual_ctr) :
1413 (&_resolve_static_ctr);
1414 AtomicAccess::inc(addr);
1415
1416 if (TraceCallFixup) {
1417 ResourceMark rm(current);
1418 tty->print("resolving %s%s (%s) call to",
1419 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static",
1420 Bytecodes::name(invoke_code));
1421 callee_method->print_short_name(tty);
1422 tty->print_cr(" at pc: " INTPTR_FORMAT " to code: " INTPTR_FORMAT,
1423 p2i(caller_frame.pc()), p2i(callee_method->code()));
1424 }
1425 #endif
1426
1427 if (invoke_code == Bytecodes::_invokestatic) {
1428 assert(callee_method->method_holder()->is_initialized() ||
1429 callee_method->method_holder()->is_reentrant_initialization(current),
1430 "invalid class initialization state for invoke_static");
1431 if (!VM_Version::supports_fast_class_init_checks() && callee_method->needs_clinit_barrier()) {
1432 // In order to keep class initialization check, do not patch call
1433 // site for static call when the class is not fully initialized.
1434 // Proper check is enforced by call site re-resolution on every invocation.
1435 //
1436 // When fast class initialization checks are supported (VM_Version::supports_fast_class_init_checks() == true),
1437 // explicit class initialization check is put in nmethod entry (VEP).
1438 assert(callee_method->method_holder()->is_linked(), "must be");
1439 return callee_method;
1440 }
1441 }
1442
1443
1444 // JSR 292 key invariant:
1445 // If the resolved method is a MethodHandle invoke target, the call
1446 // site must be a MethodHandle call site, because the lambda form might tail-call
1447 // leaving the stack in a state unknown to either caller or callee
1448
1449 // Compute entry points. The computation of the entry points is independent of
1450 // patching the call.
1451
1452 // Make sure the callee nmethod does not get deoptimized and removed before
1453 // we are done patching the code.
1454
1455
1456 CompiledICLocker ml(caller_nm);
1457 if (is_virtual && !is_optimized) {
1458 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1459 inline_cache->update(&call_info, receiver->klass());
1460 } else {
1461 // Callsite is a direct call - set it to the destination method
1462 CompiledDirectCall* callsite = CompiledDirectCall::before(caller_frame.pc());
1463 callsite->set(callee_method);
1464 }
1465
1466 return callee_method;
1467 }
1468
1469 // Inline caches exist only in compiled code
1470 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* current))
1471 #ifdef ASSERT
1472 RegisterMap reg_map(current,
1473 RegisterMap::UpdateMap::skip,
1474 RegisterMap::ProcessFrames::include,
1475 RegisterMap::WalkContinuation::skip);
1476 frame stub_frame = current->last_frame();
1477 assert(stub_frame.is_runtime_frame(), "sanity check");
1478 frame caller_frame = stub_frame.sender(®_map);
1479 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame() && !caller_frame.is_upcall_stub_frame(), "unexpected frame");
1480 #endif /* ASSERT */
1481
1482 methodHandle callee_method;
1483 JRT_BLOCK
1484 callee_method = SharedRuntime::handle_ic_miss_helper(CHECK_NULL);
1485 // Return Method* through TLS
1486 current->set_vm_result_metadata(callee_method());
1487 JRT_BLOCK_END
1488 // return compiled code entry point after potential safepoints
1489 return get_resolved_entry(current, callee_method);
1490 JRT_END
1491
1492
1493 // Handle call site that has been made non-entrant
1494 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* current))
1495 // 6243940 We might end up in here if the callee is deoptimized
1496 // as we race to call it. We don't want to take a safepoint if
1497 // the caller was interpreted because the caller frame will look
1498 // interpreted to the stack walkers and arguments are now
1499 // "compiled" so it is much better to make this transition
1500 // invisible to the stack walking code. The i2c path will
1501 // place the callee method in the callee_target. It is stashed
1502 // there because if we try and find the callee by normal means a
1503 // safepoint is possible and have trouble gc'ing the compiled args.
1504 RegisterMap reg_map(current,
1505 RegisterMap::UpdateMap::skip,
1506 RegisterMap::ProcessFrames::include,
1507 RegisterMap::WalkContinuation::skip);
1508 frame stub_frame = current->last_frame();
1509 assert(stub_frame.is_runtime_frame(), "sanity check");
1510 frame caller_frame = stub_frame.sender(®_map);
1511
1512 if (caller_frame.is_interpreted_frame() ||
1513 caller_frame.is_entry_frame() ||
1514 caller_frame.is_upcall_stub_frame()) {
1515 Method* callee = current->callee_target();
1516 guarantee(callee != nullptr && callee->is_method(), "bad handshake");
1517 current->set_vm_result_metadata(callee);
1518 current->set_callee_target(nullptr);
1519 if (caller_frame.is_entry_frame() && VM_Version::supports_fast_class_init_checks()) {
1520 // Bypass class initialization checks in c2i when caller is in native.
1521 // JNI calls to static methods don't have class initialization checks.
1522 // Fast class initialization checks are present in c2i adapters and call into
1523 // SharedRuntime::handle_wrong_method() on the slow path.
1524 //
1525 // JVM upcalls may land here as well, but there's a proper check present in
1526 // LinkResolver::resolve_static_call (called from JavaCalls::call_static),
1527 // so bypassing it in c2i adapter is benign.
1528 return callee->get_c2i_no_clinit_check_entry();
1529 } else {
1530 return callee->get_c2i_entry();
1531 }
1532 }
1533
1534 // Must be compiled to compiled path which is safe to stackwalk
1535 methodHandle callee_method;
1536 JRT_BLOCK
1537 // Force resolving of caller (if we called from compiled frame)
1538 callee_method = SharedRuntime::reresolve_call_site(CHECK_NULL);
1539 current->set_vm_result_metadata(callee_method());
1540 JRT_BLOCK_END
1541 // return compiled code entry point after potential safepoints
1542 return get_resolved_entry(current, callee_method);
1543 JRT_END
1544
1545 // Handle abstract method call
1546 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_abstract(JavaThread* current))
1547 // Verbose error message for AbstractMethodError.
1548 // Get the called method from the invoke bytecode.
1549 vframeStream vfst(current, true);
1550 assert(!vfst.at_end(), "Java frame must exist");
1551 methodHandle caller(current, vfst.method());
1552 Bytecode_invoke invoke(caller, vfst.bci());
1553 DEBUG_ONLY( invoke.verify(); )
1554
1555 // Find the compiled caller frame.
1556 RegisterMap reg_map(current,
1557 RegisterMap::UpdateMap::include,
1558 RegisterMap::ProcessFrames::include,
1559 RegisterMap::WalkContinuation::skip);
1560 frame stubFrame = current->last_frame();
1561 assert(stubFrame.is_runtime_frame(), "must be");
1562 frame callerFrame = stubFrame.sender(®_map);
1563 assert(callerFrame.is_compiled_frame(), "must be");
1564
1565 // Install exception and return forward entry.
1566 address res = SharedRuntime::throw_AbstractMethodError_entry();
1567 JRT_BLOCK
1568 methodHandle callee(current, invoke.static_target(current));
1569 if (!callee.is_null()) {
1570 oop recv = callerFrame.retrieve_receiver(®_map);
1571 Klass *recv_klass = (recv != nullptr) ? recv->klass() : nullptr;
1572 res = StubRoutines::forward_exception_entry();
1573 LinkResolver::throw_abstract_method_error(callee, recv_klass, CHECK_(res));
1574 }
1575 JRT_BLOCK_END
1576 return res;
1577 JRT_END
1578
1579 // return verified_code_entry if interp_only_mode is not set for the current thread;
1580 // otherwise return c2i entry.
1581 address SharedRuntime::get_resolved_entry(JavaThread* current, methodHandle callee_method) {
1582 if (current->is_interp_only_mode() && !callee_method->is_special_native_intrinsic()) {
1583 // In interp_only_mode we need to go to the interpreted entry
1584 // The c2i won't patch in this mode -- see fixup_callers_callsite
1585 return callee_method->get_c2i_entry();
1586 }
1587 assert(callee_method->verified_code_entry() != nullptr, " Jump to zero!");
1588 return callee_method->verified_code_entry();
1589 }
1590
1591 // resolve a static call and patch code
1592 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread* current ))
1593 methodHandle callee_method;
1594 bool enter_special = false;
1595 JRT_BLOCK
1596 callee_method = SharedRuntime::resolve_helper(false, false, CHECK_NULL);
1597 current->set_vm_result_metadata(callee_method());
1598 JRT_BLOCK_END
1599 // return compiled code entry point after potential safepoints
1600 return get_resolved_entry(current, callee_method);
1601 JRT_END
1602
1603 // resolve virtual call and update inline cache to monomorphic
1604 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread* current))
1605 methodHandle callee_method;
1606 JRT_BLOCK
1607 callee_method = SharedRuntime::resolve_helper(true, false, CHECK_NULL);
1608 current->set_vm_result_metadata(callee_method());
1609 JRT_BLOCK_END
1610 // return compiled code entry point after potential safepoints
1611 return get_resolved_entry(current, callee_method);
1612 JRT_END
1613
1614
1615 // Resolve a virtual call that can be statically bound (e.g., always
1616 // monomorphic, so it has no inline cache). Patch code to resolved target.
1617 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread* current))
1618 methodHandle callee_method;
1619 JRT_BLOCK
1620 callee_method = SharedRuntime::resolve_helper(true, true, CHECK_NULL);
1621 current->set_vm_result_metadata(callee_method());
1622 JRT_BLOCK_END
1623 // return compiled code entry point after potential safepoints
1624 return get_resolved_entry(current, callee_method);
1625 JRT_END
1626
1627 methodHandle SharedRuntime::handle_ic_miss_helper(TRAPS) {
1628 JavaThread* current = THREAD;
1629 ResourceMark rm(current);
1630 CallInfo call_info;
1631 Bytecodes::Code bc;
1632
1633 // receiver is null for static calls. An exception is thrown for null
1634 // receivers for non-static calls
1635 Handle receiver = find_callee_info(bc, call_info, CHECK_(methodHandle()));
1636
1637 methodHandle callee_method(current, call_info.selected_method());
1638
1639 #ifndef PRODUCT
1640 AtomicAccess::inc(&_ic_miss_ctr);
1641
1642 // Statistics & Tracing
1643 if (TraceCallFixup) {
1644 ResourceMark rm(current);
1645 tty->print("IC miss (%s) call to", Bytecodes::name(bc));
1646 callee_method->print_short_name(tty);
1647 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1648 }
1649
1650 if (ICMissHistogram) {
1651 MutexLocker m(VMStatistic_lock);
1652 RegisterMap reg_map(current,
1653 RegisterMap::UpdateMap::skip,
1654 RegisterMap::ProcessFrames::include,
1655 RegisterMap::WalkContinuation::skip);
1656 frame f = current->last_frame().real_sender(®_map);// skip runtime stub
1657 // produce statistics under the lock
1658 trace_ic_miss(f.pc());
1659 }
1660 #endif
1661
1662 // install an event collector so that when a vtable stub is created the
1663 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The
1664 // event can't be posted when the stub is created as locks are held
1665 // - instead the event will be deferred until the event collector goes
1666 // out of scope.
1667 JvmtiDynamicCodeEventCollector event_collector;
1668
1669 // Update inline cache to megamorphic. Skip update if we are called from interpreted.
1670 RegisterMap reg_map(current,
1671 RegisterMap::UpdateMap::skip,
1672 RegisterMap::ProcessFrames::include,
1673 RegisterMap::WalkContinuation::skip);
1674 frame caller_frame = current->last_frame().sender(®_map);
1675 CodeBlob* cb = caller_frame.cb();
1676 nmethod* caller_nm = cb->as_nmethod();
1677
1678 CompiledICLocker ml(caller_nm);
1679 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1680 inline_cache->update(&call_info, receiver()->klass());
1681
1682 return callee_method;
1683 }
1684
1685 //
1686 // Resets a call-site in compiled code so it will get resolved again.
1687 // This routines handles both virtual call sites, optimized virtual call
1688 // sites, and static call sites. Typically used to change a call sites
1689 // destination from compiled to interpreted.
1690 //
1691 methodHandle SharedRuntime::reresolve_call_site(TRAPS) {
1692 JavaThread* current = THREAD;
1693 ResourceMark rm(current);
1694 RegisterMap reg_map(current,
1695 RegisterMap::UpdateMap::skip,
1696 RegisterMap::ProcessFrames::include,
1697 RegisterMap::WalkContinuation::skip);
1698 frame stub_frame = current->last_frame();
1699 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub");
1700 frame caller = stub_frame.sender(®_map);
1701
1702 // Do nothing if the frame isn't a live compiled frame.
1703 // nmethod could be deoptimized by the time we get here
1704 // so no update to the caller is needed.
1705
1706 if ((caller.is_compiled_frame() && !caller.is_deoptimized_frame()) ||
1707 (caller.is_native_frame() && caller.cb()->as_nmethod()->method()->is_continuation_enter_intrinsic())) {
1708
1709 address pc = caller.pc();
1710
1711 nmethod* caller_nm = CodeCache::find_nmethod(pc);
1712 assert(caller_nm != nullptr, "did not find caller nmethod");
1713
1714 // Default call_addr is the location of the "basic" call.
1715 // Determine the address of the call we a reresolving. With
1716 // Inline Caches we will always find a recognizable call.
1717 // With Inline Caches disabled we may or may not find a
1718 // recognizable call. We will always find a call for static
1719 // calls and for optimized virtual calls. For vanilla virtual
1720 // calls it depends on the state of the UseInlineCaches switch.
1721 //
1722 // With Inline Caches disabled we can get here for a virtual call
1723 // for two reasons:
1724 // 1 - calling an abstract method. The vtable for abstract methods
1725 // will run us thru handle_wrong_method and we will eventually
1726 // end up in the interpreter to throw the ame.
1727 // 2 - a racing deoptimization. We could be doing a vanilla vtable
1728 // call and between the time we fetch the entry address and
1729 // we jump to it the target gets deoptimized. Similar to 1
1730 // we will wind up in the interprter (thru a c2i with c2).
1731 //
1732 CompiledICLocker ml(caller_nm);
1733 address call_addr = caller_nm->call_instruction_address(pc);
1734
1735 if (call_addr != nullptr) {
1736 // On x86 the logic for finding a call instruction is blindly checking for a call opcode 5
1737 // bytes back in the instruction stream so we must also check for reloc info.
1738 RelocIterator iter(caller_nm, call_addr, call_addr+1);
1739 bool ret = iter.next(); // Get item
1740 if (ret) {
1741 switch (iter.type()) {
1742 case relocInfo::static_call_type:
1743 case relocInfo::opt_virtual_call_type: {
1744 CompiledDirectCall* cdc = CompiledDirectCall::at(call_addr);
1745 cdc->set_to_clean();
1746 break;
1747 }
1748
1749 case relocInfo::virtual_call_type: {
1750 // compiled, dispatched call (which used to call an interpreted method)
1751 CompiledIC* inline_cache = CompiledIC_at(caller_nm, call_addr);
1752 inline_cache->set_to_clean();
1753 break;
1754 }
1755 default:
1756 break;
1757 }
1758 }
1759 }
1760 }
1761
1762 methodHandle callee_method = find_callee_method(CHECK_(methodHandle()));
1763
1764
1765 #ifndef PRODUCT
1766 AtomicAccess::inc(&_wrong_method_ctr);
1767
1768 if (TraceCallFixup) {
1769 ResourceMark rm(current);
1770 tty->print("handle_wrong_method reresolving call to");
1771 callee_method->print_short_name(tty);
1772 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1773 }
1774 #endif
1775
1776 return callee_method;
1777 }
1778
1779 address SharedRuntime::handle_unsafe_access(JavaThread* thread, address next_pc) {
1780 // The faulting unsafe accesses should be changed to throw the error
1781 // synchronously instead. Meanwhile the faulting instruction will be
1782 // skipped over (effectively turning it into a no-op) and an
1783 // asynchronous exception will be raised which the thread will
1784 // handle at a later point. If the instruction is a load it will
1785 // return garbage.
1786
1787 // Request an async exception.
1788 thread->set_pending_unsafe_access_error();
1789
1790 // Return address of next instruction to execute.
1956 msglen += strlen(caster_klass_description) + strlen(target_klass_description) + strlen(klass_separator) + 3;
1957
1958 char* message = NEW_RESOURCE_ARRAY_RETURN_NULL(char, msglen);
1959 if (message == nullptr) {
1960 // Shouldn't happen, but don't cause even more problems if it does
1961 message = const_cast<char*>(caster_klass->external_name());
1962 } else {
1963 jio_snprintf(message,
1964 msglen,
1965 "class %s cannot be cast to class %s (%s%s%s)",
1966 caster_name,
1967 target_name,
1968 caster_klass_description,
1969 klass_separator,
1970 target_klass_description
1971 );
1972 }
1973 return message;
1974 }
1975
1976 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages())
1977 (void) JavaThread::current()->stack_overflow_state()->reguard_stack();
1978 JRT_END
1979
1980 void SharedRuntime::monitor_enter_helper(oopDesc* obj, BasicLock* lock, JavaThread* current) {
1981 if (!SafepointSynchronize::is_synchronizing()) {
1982 // Only try quick_enter() if we're not trying to reach a safepoint
1983 // so that the calling thread reaches the safepoint more quickly.
1984 if (ObjectSynchronizer::quick_enter(obj, lock, current)) {
1985 return;
1986 }
1987 }
1988 // NO_ASYNC required because an async exception on the state transition destructor
1989 // would leave you with the lock held and it would never be released.
1990 // The normal monitorenter NullPointerException is thrown without acquiring a lock
1991 // and the model is that an exception implies the method failed.
1992 JRT_BLOCK_NO_ASYNC
1993 Handle h_obj(THREAD, obj);
1994 ObjectSynchronizer::enter(h_obj, lock, current);
1995 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here");
2189 tty->print_cr("Note 1: counter updates are not MT-safe.");
2190 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;");
2191 tty->print_cr(" %% in nested categories are relative to their category");
2192 tty->print_cr(" (and thus add up to more than 100%% with inlining)");
2193 tty->cr();
2194
2195 MethodArityHistogram h;
2196 }
2197 #endif
2198
2199 #ifndef PRODUCT
2200 static int _lookups; // number of calls to lookup
2201 static int _equals; // number of buckets checked with matching hash
2202 static int _archived_hits; // number of successful lookups in archived table
2203 static int _runtime_hits; // number of successful lookups in runtime table
2204 #endif
2205
2206 // A simple wrapper class around the calling convention information
2207 // that allows sharing of adapters for the same calling convention.
2208 class AdapterFingerPrint : public MetaspaceObj {
2209 private:
2210 enum {
2211 _basic_type_bits = 4,
2212 _basic_type_mask = right_n_bits(_basic_type_bits),
2213 _basic_types_per_int = BitsPerInt / _basic_type_bits,
2214 };
2215 // TO DO: Consider integrating this with a more global scheme for compressing signatures.
2216 // For now, 4 bits per components (plus T_VOID gaps after double/long) is not excessive.
2217
2218 int _length;
2219
2220 static int data_offset() { return sizeof(AdapterFingerPrint); }
2221 int* data_pointer() {
2222 return (int*)((address)this + data_offset());
2223 }
2224
2225 // Private construtor. Use allocate() to get an instance.
2226 AdapterFingerPrint(int total_args_passed, BasicType* sig_bt, int len) {
2227 int* data = data_pointer();
2228 // Pack the BasicTypes with 8 per int
2229 assert(len == length(total_args_passed), "sanity");
2230 _length = len;
2231 int sig_index = 0;
2232 for (int index = 0; index < _length; index++) {
2233 int value = 0;
2234 for (int byte = 0; sig_index < total_args_passed && byte < _basic_types_per_int; byte++) {
2235 int bt = adapter_encoding(sig_bt[sig_index++]);
2236 assert((bt & _basic_type_mask) == bt, "must fit in 4 bits");
2237 value = (value << _basic_type_bits) | bt;
2238 }
2239 data[index] = value;
2240 }
2241 }
2242
2243 // Call deallocate instead
2244 ~AdapterFingerPrint() {
2245 ShouldNotCallThis();
2246 }
2247
2248 static int length(int total_args) {
2249 return (total_args + (_basic_types_per_int-1)) / _basic_types_per_int;
2250 }
2251
2252 static int compute_size_in_words(int len) {
2253 return (int)heap_word_size(sizeof(AdapterFingerPrint) + (len * sizeof(int)));
2254 }
2255
2256 // Remap BasicTypes that are handled equivalently by the adapters.
2257 // These are correct for the current system but someday it might be
2258 // necessary to make this mapping platform dependent.
2259 static int adapter_encoding(BasicType in) {
2260 switch (in) {
2261 case T_BOOLEAN:
2262 case T_BYTE:
2263 case T_SHORT:
2264 case T_CHAR:
2265 // There are all promoted to T_INT in the calling convention
2266 return T_INT;
2267
2268 case T_OBJECT:
2269 case T_ARRAY:
2270 // In other words, we assume that any register good enough for
2271 // an int or long is good enough for a managed pointer.
2272 #ifdef _LP64
2273 return T_LONG;
2274 #else
2275 return T_INT;
2276 #endif
2277
2278 case T_INT:
2279 case T_LONG:
2280 case T_FLOAT:
2281 case T_DOUBLE:
2282 case T_VOID:
2283 return in;
2284
2285 default:
2286 ShouldNotReachHere();
2287 return T_CONFLICT;
2288 }
2289 }
2290
2291 void* operator new(size_t size, size_t fp_size) throw() {
2292 assert(fp_size >= size, "sanity check");
2293 void* p = AllocateHeap(fp_size, mtCode);
2294 memset(p, 0, fp_size);
2295 return p;
2296 }
2297
2298 template<typename Function>
2299 void iterate_args(Function function) {
2300 for (int i = 0; i < length(); i++) {
2301 unsigned val = (unsigned)value(i);
2302 // args are packed so that first/lower arguments are in the highest
2303 // bits of each int value, so iterate from highest to the lowest
2304 for (int j = 32 - _basic_type_bits; j >= 0; j -= _basic_type_bits) {
2305 unsigned v = (val >> j) & _basic_type_mask;
2306 if (v == 0) {
2307 continue;
2308 }
2309 function(v);
2310 }
2311 }
2312 }
2313
2314 public:
2315 static AdapterFingerPrint* allocate(int total_args_passed, BasicType* sig_bt) {
2316 int len = length(total_args_passed);
2317 int size_in_bytes = BytesPerWord * compute_size_in_words(len);
2318 AdapterFingerPrint* afp = new (size_in_bytes) AdapterFingerPrint(total_args_passed, sig_bt, len);
2319 assert((afp->size() * BytesPerWord) == size_in_bytes, "should match");
2320 return afp;
2321 }
2322
2323 static void deallocate(AdapterFingerPrint* fp) {
2324 FreeHeap(fp);
2325 }
2326
2327 int value(int index) {
2328 int* data = data_pointer();
2329 return data[index];
2330 }
2331
2332 int length() {
2333 return _length;
2334 }
2335
2336 unsigned int compute_hash() {
2337 int hash = 0;
2338 for (int i = 0; i < length(); i++) {
2339 int v = value(i);
2340 //Add arithmetic operation to the hash, like +3 to improve hashing
2341 hash = ((hash << 8) ^ v ^ (hash >> 5)) + 3;
2342 }
2343 return (unsigned int)hash;
2344 }
2345
2346 const char* as_string() {
2347 stringStream st;
2348 st.print("0x");
2349 for (int i = 0; i < length(); i++) {
2350 st.print("%x", value(i));
2351 }
2352 return st.as_string();
2353 }
2354
2355 const char* as_basic_args_string() {
2356 stringStream st;
2357 bool long_prev = false;
2358 iterate_args([&] (int arg) {
2359 if (long_prev) {
2360 long_prev = false;
2361 if (arg == T_VOID) {
2362 st.print("J");
2363 } else {
2364 st.print("L");
2365 }
2366 }
2367 switch (arg) {
2368 case T_INT: st.print("I"); break;
2369 case T_LONG: long_prev = true; break;
2370 case T_FLOAT: st.print("F"); break;
2371 case T_DOUBLE: st.print("D"); break;
2372 case T_VOID: break;
2373 default: ShouldNotReachHere();
2374 }
2375 });
2376 if (long_prev) {
2377 st.print("L");
2378 }
2379 return st.as_string();
2380 }
2381
2382 BasicType* as_basic_type(int& nargs) {
2383 nargs = 0;
2384 GrowableArray<BasicType> btarray;
2385 bool long_prev = false;
2386
2387 iterate_args([&] (int arg) {
2388 if (long_prev) {
2389 long_prev = false;
2390 if (arg == T_VOID) {
2391 btarray.append(T_LONG);
2392 } else {
2393 btarray.append(T_OBJECT); // it could be T_ARRAY; it shouldn't matter
2394 }
2395 }
2396 switch (arg) {
2397 case T_INT: // fallthrough
2398 case T_FLOAT: // fallthrough
2399 case T_DOUBLE:
2400 case T_VOID:
2401 btarray.append((BasicType)arg);
2402 break;
2403 case T_LONG:
2404 long_prev = true;
2405 break;
2406 default: ShouldNotReachHere();
2407 }
2408 });
2409
2410 if (long_prev) {
2411 btarray.append(T_OBJECT);
2412 }
2413
2414 nargs = btarray.length();
2415 BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, nargs);
2416 int index = 0;
2417 GrowableArrayIterator<BasicType> iter = btarray.begin();
2418 while (iter != btarray.end()) {
2419 sig_bt[index++] = *iter;
2420 ++iter;
2421 }
2422 assert(index == btarray.length(), "sanity check");
2423 #ifdef ASSERT
2424 {
2425 AdapterFingerPrint* compare_fp = AdapterFingerPrint::allocate(nargs, sig_bt);
2426 assert(this->equals(compare_fp), "sanity check");
2427 AdapterFingerPrint::deallocate(compare_fp);
2428 }
2429 #endif
2430 return sig_bt;
2431 }
2432
2433 bool equals(AdapterFingerPrint* other) {
2434 if (other->_length != _length) {
2435 return false;
2436 } else {
2437 for (int i = 0; i < _length; i++) {
2438 if (value(i) != other->value(i)) {
2439 return false;
2440 }
2441 }
2442 }
2443 return true;
2444 }
2445
2446 // methods required by virtue of being a MetaspaceObj
2447 void metaspace_pointers_do(MetaspaceClosure* it) { return; /* nothing to do here */ }
2448 int size() const { return compute_size_in_words(_length); }
2449 MetaspaceObj::Type type() const { return AdapterFingerPrintType; }
2450
2451 static bool equals(AdapterFingerPrint* const& fp1, AdapterFingerPrint* const& fp2) {
2452 NOT_PRODUCT(_equals++);
2453 return fp1->equals(fp2);
2454 }
2455
2456 static unsigned int compute_hash(AdapterFingerPrint* const& fp) {
2457 return fp->compute_hash();
2458 }
2461 #if INCLUDE_CDS
2462 static inline bool adapter_fp_equals_compact_hashtable_entry(AdapterHandlerEntry* entry, AdapterFingerPrint* fp, int len_unused) {
2463 return AdapterFingerPrint::equals(entry->fingerprint(), fp);
2464 }
2465
2466 class ArchivedAdapterTable : public OffsetCompactHashtable<
2467 AdapterFingerPrint*,
2468 AdapterHandlerEntry*,
2469 adapter_fp_equals_compact_hashtable_entry> {};
2470 #endif // INCLUDE_CDS
2471
2472 // A hashtable mapping from AdapterFingerPrints to AdapterHandlerEntries
2473 using AdapterHandlerTable = HashTable<AdapterFingerPrint*, AdapterHandlerEntry*, 293,
2474 AnyObj::C_HEAP, mtCode,
2475 AdapterFingerPrint::compute_hash,
2476 AdapterFingerPrint::equals>;
2477 static AdapterHandlerTable* _adapter_handler_table;
2478 static GrowableArray<AdapterHandlerEntry*>* _adapter_handler_list = nullptr;
2479
2480 // Find a entry with the same fingerprint if it exists
2481 AdapterHandlerEntry* AdapterHandlerLibrary::lookup(int total_args_passed, BasicType* sig_bt) {
2482 NOT_PRODUCT(_lookups++);
2483 assert_lock_strong(AdapterHandlerLibrary_lock);
2484 AdapterFingerPrint* fp = AdapterFingerPrint::allocate(total_args_passed, sig_bt);
2485 AdapterHandlerEntry* entry = nullptr;
2486 #if INCLUDE_CDS
2487 // if we are building the archive then the archived adapter table is
2488 // not valid and we need to use the ones added to the runtime table
2489 if (AOTCodeCache::is_using_adapter()) {
2490 // Search archived table first. It is read-only table so can be searched without lock
2491 entry = _aot_adapter_handler_table.lookup(fp, fp->compute_hash(), 0 /* unused */);
2492 #ifndef PRODUCT
2493 if (entry != nullptr) {
2494 _archived_hits++;
2495 }
2496 #endif
2497 }
2498 #endif // INCLUDE_CDS
2499 if (entry == nullptr) {
2500 assert_lock_strong(AdapterHandlerLibrary_lock);
2501 AdapterHandlerEntry** entry_p = _adapter_handler_table->get(fp);
2502 if (entry_p != nullptr) {
2503 entry = *entry_p;
2504 assert(entry->fingerprint()->equals(fp), "fingerprint mismatch key fp %s %s (hash=%d) != found fp %s %s (hash=%d)",
2521 TableStatistics ts = _adapter_handler_table->statistics_calculate(size);
2522 ts.print(tty, "AdapterHandlerTable");
2523 tty->print_cr("AdapterHandlerTable (table_size=%d, entries=%d)",
2524 _adapter_handler_table->table_size(), _adapter_handler_table->number_of_entries());
2525 int total_hits = _archived_hits + _runtime_hits;
2526 tty->print_cr("AdapterHandlerTable: lookups %d equals %d hits %d (archived=%d+runtime=%d)",
2527 _lookups, _equals, total_hits, _archived_hits, _runtime_hits);
2528 }
2529 #endif
2530
2531 // ---------------------------------------------------------------------------
2532 // Implementation of AdapterHandlerLibrary
2533 AdapterHandlerEntry* AdapterHandlerLibrary::_no_arg_handler = nullptr;
2534 AdapterHandlerEntry* AdapterHandlerLibrary::_int_arg_handler = nullptr;
2535 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_arg_handler = nullptr;
2536 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_int_arg_handler = nullptr;
2537 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_obj_arg_handler = nullptr;
2538 #if INCLUDE_CDS
2539 ArchivedAdapterTable AdapterHandlerLibrary::_aot_adapter_handler_table;
2540 #endif // INCLUDE_CDS
2541 static const int AdapterHandlerLibrary_size = 16*K;
2542 BufferBlob* AdapterHandlerLibrary::_buffer = nullptr;
2543 volatile uint AdapterHandlerLibrary::_id_counter = 0;
2544
2545 BufferBlob* AdapterHandlerLibrary::buffer_blob() {
2546 assert(_buffer != nullptr, "should be initialized");
2547 return _buffer;
2548 }
2549
2550 static void post_adapter_creation(const AdapterHandlerEntry* entry) {
2551 if (Forte::is_enabled() || JvmtiExport::should_post_dynamic_code_generated()) {
2552 AdapterBlob* adapter_blob = entry->adapter_blob();
2553 char blob_id[256];
2554 jio_snprintf(blob_id,
2555 sizeof(blob_id),
2556 "%s(%s)",
2557 adapter_blob->name(),
2558 entry->fingerprint()->as_string());
2559 if (Forte::is_enabled()) {
2560 Forte::register_stub(blob_id, adapter_blob->content_begin(), adapter_blob->content_end());
2561 }
2569 void AdapterHandlerLibrary::initialize() {
2570 {
2571 ResourceMark rm;
2572 _adapter_handler_table = new (mtCode) AdapterHandlerTable();
2573 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size);
2574 }
2575
2576 #if INCLUDE_CDS
2577 // Link adapters in AOT Cache to their code in AOT Code Cache
2578 if (AOTCodeCache::is_using_adapter() && !_aot_adapter_handler_table.empty()) {
2579 link_aot_adapters();
2580 lookup_simple_adapters();
2581 return;
2582 }
2583 #endif // INCLUDE_CDS
2584
2585 ResourceMark rm;
2586 {
2587 MutexLocker mu(AdapterHandlerLibrary_lock);
2588
2589 _no_arg_handler = create_adapter(0, nullptr);
2590
2591 BasicType obj_args[] = { T_OBJECT };
2592 _obj_arg_handler = create_adapter(1, obj_args);
2593
2594 BasicType int_args[] = { T_INT };
2595 _int_arg_handler = create_adapter(1, int_args);
2596
2597 BasicType obj_int_args[] = { T_OBJECT, T_INT };
2598 _obj_int_arg_handler = create_adapter(2, obj_int_args);
2599
2600 BasicType obj_obj_args[] = { T_OBJECT, T_OBJECT };
2601 _obj_obj_arg_handler = create_adapter(2, obj_obj_args);
2602
2603 // we should always get an entry back but we don't have any
2604 // associated blob on Zero
2605 assert(_no_arg_handler != nullptr &&
2606 _obj_arg_handler != nullptr &&
2607 _int_arg_handler != nullptr &&
2608 _obj_int_arg_handler != nullptr &&
2609 _obj_obj_arg_handler != nullptr, "Initial adapter handlers must be properly created");
2610 }
2611
2612 // Outside of the lock
2613 #ifndef ZERO
2614 // no blobs to register when we are on Zero
2615 post_adapter_creation(_no_arg_handler);
2616 post_adapter_creation(_obj_arg_handler);
2617 post_adapter_creation(_int_arg_handler);
2618 post_adapter_creation(_obj_int_arg_handler);
2619 post_adapter_creation(_obj_obj_arg_handler);
2620 #endif // ZERO
2621 }
2622
2623 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint) {
2624 uint id = (uint)AtomicAccess::add((int*)&_id_counter, 1);
2625 assert(id > 0, "we can never overflow because AOT cache cannot contain more than 2^32 methods");
2626 return AdapterHandlerEntry::allocate(id, fingerprint);
2627 }
2628
2629 AdapterHandlerEntry* AdapterHandlerLibrary::get_simple_adapter(const methodHandle& method) {
2630 int total_args_passed = method->size_of_parameters(); // All args on stack
2631 if (total_args_passed == 0) {
2632 return _no_arg_handler;
2633 } else if (total_args_passed == 1) {
2634 if (!method->is_static()) {
2635 return _obj_arg_handler;
2636 }
2637 switch (method->signature()->char_at(1)) {
2638 case JVM_SIGNATURE_CLASS:
2639 case JVM_SIGNATURE_ARRAY:
2640 return _obj_arg_handler;
2641 case JVM_SIGNATURE_INT:
2642 case JVM_SIGNATURE_BOOLEAN:
2643 case JVM_SIGNATURE_CHAR:
2644 case JVM_SIGNATURE_BYTE:
2645 case JVM_SIGNATURE_SHORT:
2646 return _int_arg_handler;
2647 }
2648 } else if (total_args_passed == 2 &&
2649 !method->is_static()) {
2650 switch (method->signature()->char_at(1)) {
2651 case JVM_SIGNATURE_CLASS:
2652 case JVM_SIGNATURE_ARRAY:
2653 return _obj_obj_arg_handler;
2654 case JVM_SIGNATURE_INT:
2655 case JVM_SIGNATURE_BOOLEAN:
2656 case JVM_SIGNATURE_CHAR:
2657 case JVM_SIGNATURE_BYTE:
2658 case JVM_SIGNATURE_SHORT:
2659 return _obj_int_arg_handler;
2660 }
2661 }
2662 return nullptr;
2663 }
2664
2665 class AdapterSignatureIterator : public SignatureIterator {
2666 private:
2667 BasicType stack_sig_bt[16];
2668 BasicType* sig_bt;
2669 int index;
2670
2671 public:
2672 AdapterSignatureIterator(Symbol* signature,
2673 fingerprint_t fingerprint,
2674 bool is_static,
2675 int total_args_passed) :
2676 SignatureIterator(signature, fingerprint),
2677 index(0)
2678 {
2679 sig_bt = (total_args_passed <= 16) ? stack_sig_bt : NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2680 if (!is_static) { // Pass in receiver first
2681 sig_bt[index++] = T_OBJECT;
2682 }
2683 do_parameters_on(this);
2684 }
2685
2686 BasicType* basic_types() {
2687 return sig_bt;
2688 }
2689
2690 #ifdef ASSERT
2691 int slots() {
2692 return index;
2693 }
2694 #endif
2695
2696 private:
2697
2698 friend class SignatureIterator; // so do_parameters_on can call do_type
2699 void do_type(BasicType type) {
2700 sig_bt[index++] = type;
2701 if (type == T_LONG || type == T_DOUBLE) {
2702 sig_bt[index++] = T_VOID; // Longs & doubles take 2 Java slots
2703 }
2704 }
2705 };
2706
2707
2708 const char* AdapterHandlerEntry::_entry_names[] = {
2709 "i2c", "c2i", "c2i_unverified", "c2i_no_clinit_check"
2710 };
2711
2712 #ifdef ASSERT
2713 void AdapterHandlerLibrary::verify_adapter_sharing(int total_args_passed, BasicType* sig_bt, AdapterHandlerEntry* cached_entry) {
2714 // we can only check for the same code if there is any
2715 #ifndef ZERO
2716 AdapterHandlerEntry* comparison_entry = create_adapter(total_args_passed, sig_bt, true);
2717 assert(comparison_entry->adapter_blob() == nullptr, "no blob should be created when creating an adapter for comparison");
2718 assert(comparison_entry->compare_code(cached_entry), "code must match");
2719 // Release the one just created
2720 AdapterHandlerEntry::deallocate(comparison_entry);
2721 # endif // ZERO
2722 }
2723 #endif /* ASSERT*/
2724
2725 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(const methodHandle& method) {
2726 assert(!method->is_abstract(), "abstract methods do not have adapters");
2727 // Use customized signature handler. Need to lock around updates to
2728 // the _adapter_handler_table (it is not safe for concurrent readers
2729 // and a single writer: this could be fixed if it becomes a
2730 // problem).
2731
2732 // Fast-path for trivial adapters
2733 AdapterHandlerEntry* entry = get_simple_adapter(method);
2734 if (entry != nullptr) {
2735 return entry;
2736 }
2737
2738 ResourceMark rm;
2739 bool new_entry = false;
2740
2741 // Fill in the signature array, for the calling-convention call.
2742 int total_args_passed = method->size_of_parameters(); // All args on stack
2743
2744 AdapterSignatureIterator si(method->signature(), method->constMethod()->fingerprint(),
2745 method->is_static(), total_args_passed);
2746 assert(si.slots() == total_args_passed, "");
2747 BasicType* sig_bt = si.basic_types();
2748 {
2749 MutexLocker mu(AdapterHandlerLibrary_lock);
2750
2751 // Lookup method signature's fingerprint
2752 entry = lookup(total_args_passed, sig_bt);
2753
2754 if (entry != nullptr) {
2755 #ifndef ZERO
2756 assert(entry->is_linked(), "AdapterHandlerEntry must have been linked");
2757 #endif
2758 #ifdef ASSERT
2759 if (!entry->in_aot_cache() && VerifyAdapterSharing) {
2760 verify_adapter_sharing(total_args_passed, sig_bt, entry);
2761 }
2762 #endif
2763 } else {
2764 entry = create_adapter(total_args_passed, sig_bt);
2765 if (entry != nullptr) {
2766 new_entry = true;
2767 }
2768 }
2769 }
2770
2771 // Outside of the lock
2772 if (new_entry) {
2773 post_adapter_creation(entry);
2774 }
2775 return entry;
2776 }
2777
2778 void AdapterHandlerLibrary::lookup_aot_cache(AdapterHandlerEntry* handler) {
2779 ResourceMark rm;
2780 const char* name = AdapterHandlerLibrary::name(handler);
2781 const uint32_t id = AdapterHandlerLibrary::id(handler);
2782
2783 CodeBlob* blob = AOTCodeCache::load_code_blob(AOTCodeEntry::Adapter, id, name);
2784 if (blob != nullptr) {
2799 }
2800 insts_size = adapter_blob->code_size();
2801 st->print_cr("i2c argument handler for: %s %s (%d bytes generated)",
2802 handler->fingerprint()->as_basic_args_string(),
2803 handler->fingerprint()->as_string(), insts_size);
2804 st->print_cr("c2i argument handler starts at " INTPTR_FORMAT, p2i(handler->get_c2i_entry()));
2805 if (Verbose || PrintStubCode) {
2806 address first_pc = adapter_blob->content_begin();
2807 if (first_pc != nullptr) {
2808 Disassembler::decode(first_pc, first_pc + insts_size, st, &adapter_blob->asm_remarks());
2809 st->cr();
2810 }
2811 }
2812 }
2813 #endif // PRODUCT
2814
2815 void AdapterHandlerLibrary::address_to_offset(address entry_address[AdapterBlob::ENTRY_COUNT],
2816 int entry_offset[AdapterBlob::ENTRY_COUNT]) {
2817 entry_offset[AdapterBlob::I2C] = 0;
2818 entry_offset[AdapterBlob::C2I] = entry_address[AdapterBlob::C2I] - entry_address[AdapterBlob::I2C];
2819 entry_offset[AdapterBlob::C2I_Unverified] = entry_address[AdapterBlob::C2I_Unverified] - entry_address[AdapterBlob::I2C];
2820 if (entry_address[AdapterBlob::C2I_No_Clinit_Check] == nullptr) {
2821 entry_offset[AdapterBlob::C2I_No_Clinit_Check] = -1;
2822 } else {
2823 entry_offset[AdapterBlob::C2I_No_Clinit_Check] = entry_address[AdapterBlob::C2I_No_Clinit_Check] - entry_address[AdapterBlob::I2C];
2824 }
2825 }
2826
2827 bool AdapterHandlerLibrary::generate_adapter_code(AdapterHandlerEntry* handler,
2828 int total_args_passed,
2829 BasicType* sig_bt,
2830 bool is_transient) {
2831 if (log_is_enabled(Info, perf, class, link)) {
2832 ClassLoader::perf_method_adapters_count()->inc();
2833 }
2834
2835 #ifndef ZERO
2836 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2837 CodeBuffer buffer(buf);
2838 short buffer_locs[20];
2839 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs,
2840 sizeof(buffer_locs)/sizeof(relocInfo));
2841 MacroAssembler masm(&buffer);
2842 VMRegPair stack_regs[16];
2843 VMRegPair* regs = (total_args_passed <= 16) ? stack_regs : NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2844
2845 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage
2846 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed);
2847 address entry_address[AdapterBlob::ENTRY_COUNT];
2848 SharedRuntime::generate_i2c2i_adapters(&masm,
2849 total_args_passed,
2850 comp_args_on_stack,
2851 sig_bt,
2852 regs,
2853 entry_address);
2854 // On zero there is no code to save and no need to create a blob and
2855 // or relocate the handler.
2856 int entry_offset[AdapterBlob::ENTRY_COUNT];
2857 address_to_offset(entry_address, entry_offset);
2858 #ifdef ASSERT
2859 if (VerifyAdapterSharing) {
2860 handler->save_code(buf->code_begin(), buffer.insts_size());
2861 if (is_transient) {
2862 return true;
2863 }
2864 }
2865 #endif
2866 AdapterBlob* adapter_blob = AdapterBlob::create(&buffer, entry_offset);
2867 if (adapter_blob == nullptr) {
2868 // CodeCache is full, disable compilation
2869 // Ought to log this but compile log is only per compile thread
2870 // and we're some non descript Java thread.
2871 return false;
2872 }
2873 handler->set_adapter_blob(adapter_blob);
2874 if (!is_transient && AOTCodeCache::is_dumping_adapter()) {
2875 // try to save generated code
2876 const char* name = AdapterHandlerLibrary::name(handler);
2877 const uint32_t id = AdapterHandlerLibrary::id(handler);
2878 bool success = AOTCodeCache::store_code_blob(*adapter_blob, AOTCodeEntry::Adapter, id, name);
2879 assert(success || !AOTCodeCache::is_dumping_adapter(), "caching of adapter must be disabled");
2880 }
2881 #endif // ZERO
2882
2883 #ifndef PRODUCT
2884 // debugging support
2885 if (PrintAdapterHandlers || PrintStubCode) {
2886 print_adapter_handler_info(tty, handler);
2887 }
2888 #endif
2889
2890 return true;
2891 }
2892
2893 AdapterHandlerEntry* AdapterHandlerLibrary::create_adapter(int total_args_passed,
2894 BasicType* sig_bt,
2895 bool is_transient) {
2896 AdapterFingerPrint* fp = AdapterFingerPrint::allocate(total_args_passed, sig_bt);
2897 AdapterHandlerEntry* handler = AdapterHandlerLibrary::new_entry(fp);
2898 if (!generate_adapter_code(handler, total_args_passed, sig_bt, is_transient)) {
2899 AdapterHandlerEntry::deallocate(handler);
2900 return nullptr;
2901 }
2902 if (!is_transient) {
2903 assert_lock_strong(AdapterHandlerLibrary_lock);
2904 _adapter_handler_table->put(fp, handler);
2905 }
2906 return handler;
2907 }
2908
2909 #if INCLUDE_CDS
2910 void AdapterHandlerEntry::remove_unshareable_info() {
2911 #ifdef ASSERT
2912 _saved_code = nullptr;
2913 _saved_code_length = 0;
2914 #endif // ASSERT
2915 _adapter_blob = nullptr;
2916 _linked = false;
2917 }
2918
2919 class CopyAdapterTableToArchive : StackObj {
2920 private:
2921 CompactHashtableWriter* _writer;
2922 ArchiveBuilder* _builder;
2923 public:
2924 CopyAdapterTableToArchive(CompactHashtableWriter* writer) : _writer(writer),
2925 _builder(ArchiveBuilder::current())
2926 {}
2927
2928 bool do_entry(AdapterFingerPrint* fp, AdapterHandlerEntry* entry) {
2929 LogStreamHandle(Trace, aot) lsh;
2930 if (ArchiveBuilder::current()->has_been_archived((address)entry)) {
2931 assert(ArchiveBuilder::current()->has_been_archived((address)fp), "must be");
2932 AdapterFingerPrint* buffered_fp = ArchiveBuilder::current()->get_buffered_addr(fp);
2933 assert(buffered_fp != nullptr,"sanity check");
2934 AdapterHandlerEntry* buffered_entry = ArchiveBuilder::current()->get_buffered_addr(entry);
2935 assert(buffered_entry != nullptr,"sanity check");
2936
2976 }
2977 #endif
2978 }
2979
2980 // This method is used during production run to link archived adapters (stored in AOT Cache)
2981 // to their code in AOT Code Cache
2982 void AdapterHandlerEntry::link() {
2983 ResourceMark rm;
2984 assert(_fingerprint != nullptr, "_fingerprint must not be null");
2985 bool generate_code = false;
2986 // Generate code only if AOTCodeCache is not available, or
2987 // caching adapters is disabled, or we fail to link
2988 // the AdapterHandlerEntry to its code in the AOTCodeCache
2989 if (AOTCodeCache::is_using_adapter()) {
2990 AdapterHandlerLibrary::link_aot_adapter_handler(this);
2991 // If link_aot_adapter_handler() succeeds, _adapter_blob will be non-null
2992 if (_adapter_blob == nullptr) {
2993 log_warning(aot)("Failed to link AdapterHandlerEntry (fp=%s) to its code in the AOT code cache", _fingerprint->as_basic_args_string());
2994 generate_code = true;
2995 }
2996 } else {
2997 generate_code = true;
2998 }
2999 if (generate_code) {
3000 int nargs;
3001 BasicType* bt = _fingerprint->as_basic_type(nargs);
3002 if (!AdapterHandlerLibrary::generate_adapter_code(this, nargs, bt, /* is_transient */ false)) {
3003 // Don't throw exceptions during VM initialization because java.lang.* classes
3004 // might not have been initialized, causing problems when constructing the
3005 // Java exception object.
3006 vm_exit_during_initialization("Out of space in CodeCache for adapters");
3007 }
3008 }
3009 if (_adapter_blob != nullptr) {
3010 post_adapter_creation(this);
3011 }
3012 assert(_linked, "AdapterHandlerEntry must now be linked");
3013 }
3014
3015 void AdapterHandlerLibrary::link_aot_adapters() {
3016 uint max_id = 0;
3017 assert(AOTCodeCache::is_using_adapter(), "AOT adapters code should be available");
3018 /* It is possible that some adapters generated in assembly phase are not stored in the cache.
3019 * That implies adapter ids of the adapters in the cache may not be contiguous.
3020 * If the size of the _aot_adapter_handler_table is used to initialize _id_counter, then it may
3021 * result in collision of adapter ids between AOT stored handlers and runtime generated handlers.
3022 * To avoid such situation, initialize the _id_counter with the largest adapter id among the AOT stored handlers.
3023 */
3024 _aot_adapter_handler_table.iterate_all([&](AdapterHandlerEntry* entry) {
3025 assert(!entry->is_linked(), "AdapterHandlerEntry is already linked!");
3026 entry->link();
3027 max_id = MAX2(max_id, entry->id());
3028 });
3029 // Set adapter id to the maximum id found in the AOTCache
3030 assert(_id_counter == 0, "Did not expect new AdapterHandlerEntry to be created at this stage");
3031 _id_counter = max_id;
3032 }
3033
3034 // This method is called during production run to lookup simple adapters
3035 // in the archived adapter handler table
3036 void AdapterHandlerLibrary::lookup_simple_adapters() {
3037 assert(!_aot_adapter_handler_table.empty(), "archived adapter handler table is empty");
3038
3039 MutexLocker mu(AdapterHandlerLibrary_lock);
3040 _no_arg_handler = lookup(0, nullptr);
3041
3042 BasicType obj_args[] = { T_OBJECT };
3043 _obj_arg_handler = lookup(1, obj_args);
3044
3045 BasicType int_args[] = { T_INT };
3046 _int_arg_handler = lookup(1, int_args);
3047
3048 BasicType obj_int_args[] = { T_OBJECT, T_INT };
3049 _obj_int_arg_handler = lookup(2, obj_int_args);
3050
3051 BasicType obj_obj_args[] = { T_OBJECT, T_OBJECT };
3052 _obj_obj_arg_handler = lookup(2, obj_obj_args);
3053
3054 assert(_no_arg_handler != nullptr &&
3055 _obj_arg_handler != nullptr &&
3056 _int_arg_handler != nullptr &&
3057 _obj_int_arg_handler != nullptr &&
3058 _obj_obj_arg_handler != nullptr, "Initial adapters not found in archived adapter handler table");
3059 assert(_no_arg_handler->is_linked() &&
3060 _obj_arg_handler->is_linked() &&
3061 _int_arg_handler->is_linked() &&
3062 _obj_int_arg_handler->is_linked() &&
3063 _obj_obj_arg_handler->is_linked(), "Initial adapters not in linked state");
3064 }
3065 #endif // INCLUDE_CDS
3066
3067 void AdapterHandlerEntry::metaspace_pointers_do(MetaspaceClosure* it) {
3068 LogStreamHandle(Trace, aot) lsh;
3069 if (lsh.is_enabled()) {
3070 lsh.print("Iter(AdapterHandlerEntry): %p(%s)", this, _fingerprint->as_basic_args_string());
3071 lsh.cr();
3072 }
3073 it->push(&_fingerprint);
3074 }
3075
3076 AdapterHandlerEntry::~AdapterHandlerEntry() {
3077 if (_fingerprint != nullptr) {
3078 AdapterFingerPrint::deallocate(_fingerprint);
3079 _fingerprint = nullptr;
3080 }
3081 #ifdef ASSERT
3082 FREE_C_HEAP_ARRAY(unsigned char, _saved_code);
3083 #endif
3084 FreeHeap(this);
3085 }
3086
3087
3088 #ifdef ASSERT
3089 // Capture the code before relocation so that it can be compared
3090 // against other versions. If the code is captured after relocation
3091 // then relative instructions won't be equivalent.
3092 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length) {
3093 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length, mtCode);
3094 _saved_code_length = length;
3095 memcpy(_saved_code, buffer, length);
3096 }
3097
3098
3099 bool AdapterHandlerEntry::compare_code(AdapterHandlerEntry* other) {
3100 assert(_saved_code != nullptr && other->_saved_code != nullptr, "code not saved");
3148
3149 struct { double data[20]; } locs_buf;
3150 struct { double data[20]; } stubs_locs_buf;
3151 buffer.insts()->initialize_shared_locs((relocInfo*)&locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
3152 #if defined(AARCH64) || defined(PPC64)
3153 // On AArch64 with ZGC and nmethod entry barriers, we need all oops to be
3154 // in the constant pool to ensure ordering between the barrier and oops
3155 // accesses. For native_wrappers we need a constant.
3156 // On PPC64 the continuation enter intrinsic needs the constant pool for the compiled
3157 // static java call that is resolved in the runtime.
3158 if (PPC64_ONLY(method->is_continuation_enter_intrinsic() &&) true) {
3159 buffer.initialize_consts_size(8 PPC64_ONLY(+ 24));
3160 }
3161 #endif
3162 buffer.stubs()->initialize_shared_locs((relocInfo*)&stubs_locs_buf, sizeof(stubs_locs_buf) / sizeof(relocInfo));
3163 MacroAssembler _masm(&buffer);
3164
3165 // Fill in the signature array, for the calling-convention call.
3166 const int total_args_passed = method->size_of_parameters();
3167
3168 VMRegPair stack_regs[16];
3169 VMRegPair* regs = (total_args_passed <= 16) ? stack_regs : NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
3170
3171 AdapterSignatureIterator si(method->signature(), method->constMethod()->fingerprint(),
3172 method->is_static(), total_args_passed);
3173 BasicType* sig_bt = si.basic_types();
3174 assert(si.slots() == total_args_passed, "");
3175 BasicType ret_type = si.return_type();
3176
3177 // Now get the compiled-Java arguments layout.
3178 SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed);
3179
3180 // Generate the compiled-to-native wrapper code
3181 nm = SharedRuntime::generate_native_wrapper(&_masm, method, compile_id, sig_bt, regs, ret_type);
3182
3183 if (nm != nullptr) {
3184 {
3185 MutexLocker pl(NMethodState_lock, Mutex::_no_safepoint_check_flag);
3186 if (nm->make_in_use()) {
3187 method->set_code(method, nm);
3188 }
3189 }
3190
3191 DirectiveSet* directive = DirectivesStack::getMatchingDirective(method, CompileBroker::compiler(CompLevel_simple));
3192 if (directive->PrintAssemblyOption) {
3193 nm->print_code();
3194 }
3195 DirectivesStack::release(directive);
3403 if (b == handler->adapter_blob()) {
3404 found = true;
3405 st->print("Adapter for signature: ");
3406 handler->print_adapter_on(st);
3407 return false; // abort iteration
3408 } else {
3409 return true; // keep looking
3410 }
3411 };
3412 assert_locked_or_safepoint(AdapterHandlerLibrary_lock);
3413 _adapter_handler_table->iterate(findblob_runtime_table);
3414 }
3415 assert(found, "Should have found handler");
3416 }
3417
3418 void AdapterHandlerEntry::print_adapter_on(outputStream* st) const {
3419 st->print("AHE@" INTPTR_FORMAT ": %s", p2i(this), fingerprint()->as_string());
3420 if (adapter_blob() != nullptr) {
3421 st->print(" i2c: " INTPTR_FORMAT, p2i(get_i2c_entry()));
3422 st->print(" c2i: " INTPTR_FORMAT, p2i(get_c2i_entry()));
3423 st->print(" c2iUV: " INTPTR_FORMAT, p2i(get_c2i_unverified_entry()));
3424 if (get_c2i_no_clinit_check_entry() != nullptr) {
3425 st->print(" c2iNCI: " INTPTR_FORMAT, p2i(get_c2i_no_clinit_check_entry()));
3426 }
3427 }
3428 st->cr();
3429 }
3430
3431 #ifndef PRODUCT
3432
3433 void AdapterHandlerLibrary::print_statistics() {
3434 print_table_statistics();
3435 }
3436
3437 #endif /* PRODUCT */
3438
3439 JRT_LEAF(void, SharedRuntime::enable_stack_reserved_zone(JavaThread* current))
3440 assert(current == JavaThread::current(), "pre-condition");
3441 StackOverflow* overflow_state = current->stack_overflow_state();
3442 overflow_state->enable_stack_reserved_zone(/*check_if_disabled*/true);
3443 overflow_state->set_reserved_stack_activation(current->stack_base());
3490 event.set_method(method);
3491 event.commit();
3492 }
3493 }
3494 }
3495 return activation;
3496 }
3497
3498 void SharedRuntime::on_slowpath_allocation_exit(JavaThread* current) {
3499 // After any safepoint, just before going back to compiled code,
3500 // we inform the GC that we will be doing initializing writes to
3501 // this object in the future without emitting card-marks, so
3502 // GC may take any compensating steps.
3503
3504 oop new_obj = current->vm_result_oop();
3505 if (new_obj == nullptr) return;
3506
3507 BarrierSet *bs = BarrierSet::barrier_set();
3508 bs->on_slowpath_allocation_exit(current, new_obj);
3509 }
|
30 #include "classfile/javaClasses.inline.hpp"
31 #include "classfile/stringTable.hpp"
32 #include "classfile/vmClasses.hpp"
33 #include "classfile/vmSymbols.hpp"
34 #include "code/aotCodeCache.hpp"
35 #include "code/codeCache.hpp"
36 #include "code/compiledIC.hpp"
37 #include "code/nmethod.inline.hpp"
38 #include "code/scopeDesc.hpp"
39 #include "code/vtableStubs.hpp"
40 #include "compiler/abstractCompiler.hpp"
41 #include "compiler/compileBroker.hpp"
42 #include "compiler/disassembler.hpp"
43 #include "gc/shared/barrierSet.hpp"
44 #include "gc/shared/collectedHeap.hpp"
45 #include "interpreter/interpreter.hpp"
46 #include "interpreter/interpreterRuntime.hpp"
47 #include "jfr/jfrEvents.hpp"
48 #include "jvm.h"
49 #include "logging/log.hpp"
50 #include "memory/oopFactory.hpp"
51 #include "memory/resourceArea.hpp"
52 #include "memory/universe.hpp"
53 #include "metaprogramming/primitiveConversions.hpp"
54 #include "oops/access.hpp"
55 #include "oops/fieldStreams.inline.hpp"
56 #include "oops/inlineKlass.inline.hpp"
57 #include "oops/klass.hpp"
58 #include "oops/method.inline.hpp"
59 #include "oops/objArrayKlass.hpp"
60 #include "oops/objArrayOop.inline.hpp"
61 #include "oops/oop.inline.hpp"
62 #include "prims/forte.hpp"
63 #include "prims/jvmtiExport.hpp"
64 #include "prims/jvmtiThreadState.hpp"
65 #include "prims/methodHandles.hpp"
66 #include "prims/nativeLookup.hpp"
67 #include "runtime/arguments.hpp"
68 #include "runtime/atomicAccess.hpp"
69 #include "runtime/basicLock.inline.hpp"
70 #include "runtime/frame.inline.hpp"
71 #include "runtime/handles.inline.hpp"
72 #include "runtime/init.hpp"
73 #include "runtime/interfaceSupport.inline.hpp"
74 #include "runtime/java.hpp"
75 #include "runtime/javaCalls.hpp"
76 #include "runtime/jniHandles.inline.hpp"
77 #include "runtime/osThread.hpp"
78 #include "runtime/perfData.hpp"
79 #include "runtime/sharedRuntime.hpp"
80 #include "runtime/signature.hpp"
81 #include "runtime/stackWatermarkSet.hpp"
82 #include "runtime/stubRoutines.hpp"
83 #include "runtime/synchronizer.hpp"
84 #include "runtime/timerTrace.hpp"
85 #include "runtime/vframe.inline.hpp"
86 #include "runtime/vframeArray.hpp"
87 #include "runtime/vm_version.hpp"
88 #include "utilities/copy.hpp"
89 #include "utilities/dtrace.hpp"
90 #include "utilities/events.hpp"
91 #include "utilities/globalDefinitions.hpp"
92 #include "utilities/hashTable.hpp"
93 #include "utilities/macros.hpp"
94 #include "utilities/xmlstream.hpp"
95 #ifdef COMPILER1
96 #include "c1/c1_Runtime1.hpp"
97 #endif
98 #ifdef COMPILER2
99 #include "opto/runtime.hpp"
100 #endif
1218 // for a call current in progress, i.e., arguments has been pushed on stack
1219 // but callee has not been invoked yet. Caller frame must be compiled.
1220 Handle SharedRuntime::find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc,
1221 CallInfo& callinfo, TRAPS) {
1222 Handle receiver;
1223 Handle nullHandle; // create a handy null handle for exception returns
1224 JavaThread* current = THREAD;
1225
1226 assert(!vfst.at_end(), "Java frame must exist");
1227
1228 // Find caller and bci from vframe
1229 methodHandle caller(current, vfst.method());
1230 int bci = vfst.bci();
1231
1232 if (caller->is_continuation_enter_intrinsic()) {
1233 bc = Bytecodes::_invokestatic;
1234 LinkResolver::resolve_continuation_enter(callinfo, CHECK_NH);
1235 return receiver;
1236 }
1237
1238 // Substitutability test implementation piggy backs on static call resolution
1239 Bytecodes::Code code = caller->java_code_at(bci);
1240 if (code == Bytecodes::_if_acmpeq || code == Bytecodes::_if_acmpne) {
1241 bc = Bytecodes::_invokestatic;
1242 methodHandle attached_method(THREAD, extract_attached_method(vfst));
1243 assert(attached_method.not_null(), "must have attached method");
1244 vmClasses::ValueObjectMethods_klass()->initialize(CHECK_NH);
1245 LinkResolver::resolve_invoke(callinfo, receiver, attached_method, bc, false, CHECK_NH);
1246 #ifdef ASSERT
1247 Symbol* subst_method_name = vmSymbols::isSubstitutable_name();
1248 Method* is_subst = vmClasses::ValueObjectMethods_klass()->find_method(subst_method_name, vmSymbols::object_object_boolean_signature());
1249 assert(callinfo.selected_method() == is_subst, "must be isSubstitutable method");
1250 #endif
1251 return receiver;
1252 }
1253
1254 Bytecode_invoke bytecode(caller, bci);
1255 int bytecode_index = bytecode.index();
1256 bc = bytecode.invoke_code();
1257
1258 methodHandle attached_method(current, extract_attached_method(vfst));
1259 if (attached_method.not_null()) {
1260 Method* callee = bytecode.static_target(CHECK_NH);
1261 vmIntrinsics::ID id = callee->intrinsic_id();
1262 // When VM replaces MH.invokeBasic/linkTo* call with a direct/virtual call,
1263 // it attaches statically resolved method to the call site.
1264 if (MethodHandles::is_signature_polymorphic(id) &&
1265 MethodHandles::is_signature_polymorphic_intrinsic(id)) {
1266 bc = MethodHandles::signature_polymorphic_intrinsic_bytecode(id);
1267
1268 // Adjust invocation mode according to the attached method.
1269 switch (bc) {
1270 case Bytecodes::_invokevirtual:
1271 if (attached_method->method_holder()->is_interface()) {
1272 bc = Bytecodes::_invokeinterface;
1273 }
1274 break;
1275 case Bytecodes::_invokeinterface:
1276 if (!attached_method->method_holder()->is_interface()) {
1277 bc = Bytecodes::_invokevirtual;
1278 }
1279 break;
1280 case Bytecodes::_invokehandle:
1281 if (!MethodHandles::is_signature_polymorphic_method(attached_method())) {
1282 bc = attached_method->is_static() ? Bytecodes::_invokestatic
1283 : Bytecodes::_invokevirtual;
1284 }
1285 break;
1286 default:
1287 break;
1288 }
1289 } else {
1290 assert(attached_method->has_scalarized_args(), "invalid use of attached method");
1291 if (!attached_method->method_holder()->is_inline_klass()) {
1292 // Ignore the attached method in this case to not confuse below code
1293 attached_method = methodHandle(current, nullptr);
1294 }
1295 }
1296 }
1297
1298 assert(bc != Bytecodes::_illegal, "not initialized");
1299
1300 bool has_receiver = bc != Bytecodes::_invokestatic &&
1301 bc != Bytecodes::_invokedynamic &&
1302 bc != Bytecodes::_invokehandle;
1303 bool check_null_and_abstract = true;
1304
1305 // Find receiver for non-static call
1306 if (has_receiver) {
1307 // This register map must be update since we need to find the receiver for
1308 // compiled frames. The receiver might be in a register.
1309 RegisterMap reg_map2(current,
1310 RegisterMap::UpdateMap::include,
1311 RegisterMap::ProcessFrames::include,
1312 RegisterMap::WalkContinuation::skip);
1313 frame stubFrame = current->last_frame();
1314 // Caller-frame is a compiled frame
1315 frame callerFrame = stubFrame.sender(®_map2);
1316
1317 Method* callee = attached_method();
1318 if (callee == nullptr) {
1319 callee = bytecode.static_target(CHECK_NH);
1320 if (callee == nullptr) {
1321 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle);
1322 }
1323 }
1324 bool caller_is_c1 = callerFrame.is_compiled_frame() && callerFrame.cb()->as_nmethod()->is_compiled_by_c1();
1325 if (!caller_is_c1 && callee->is_scalarized_arg(0)) {
1326 // If the receiver is an inline type that is passed as fields, no oop is available
1327 // Resolve the call without receiver null checking.
1328 assert(!callee->mismatch(), "calls with inline type receivers should never mismatch");
1329 assert(attached_method.not_null() && !attached_method->is_abstract(), "must have non-abstract attached method");
1330 if (bc == Bytecodes::_invokeinterface) {
1331 bc = Bytecodes::_invokevirtual; // C2 optimistically replaces interface calls by virtual calls
1332 }
1333 check_null_and_abstract = false;
1334 } else {
1335 // Retrieve from a compiled argument list
1336 receiver = Handle(current, callerFrame.retrieve_receiver(®_map2));
1337 assert(oopDesc::is_oop_or_null(receiver()), "");
1338 if (receiver.is_null()) {
1339 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle);
1340 }
1341 }
1342 }
1343
1344 // Resolve method
1345 if (attached_method.not_null()) {
1346 // Parameterized by attached method.
1347 LinkResolver::resolve_invoke(callinfo, receiver, attached_method, bc, check_null_and_abstract, CHECK_NH);
1348 } else {
1349 // Parameterized by bytecode.
1350 constantPoolHandle constants(current, caller->constants());
1351 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_NH);
1352 }
1353
1354 #ifdef ASSERT
1355 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls
1356 if (has_receiver && check_null_and_abstract) {
1357 assert(receiver.not_null(), "should have thrown exception");
1358 Klass* receiver_klass = receiver->klass();
1359 Klass* rk = nullptr;
1360 if (attached_method.not_null()) {
1361 // In case there's resolved method attached, use its holder during the check.
1362 rk = attached_method->method_holder();
1363 } else {
1364 // Klass is already loaded.
1365 constantPoolHandle constants(current, caller->constants());
1366 rk = constants->klass_ref_at(bytecode_index, bc, CHECK_NH);
1367 }
1368 Klass* static_receiver_klass = rk;
1369 assert(receiver_klass->is_subtype_of(static_receiver_klass),
1370 "actual receiver must be subclass of static receiver klass");
1371 if (receiver_klass->is_instance_klass()) {
1372 if (InstanceKlass::cast(receiver_klass)->is_not_initialized()) {
1373 tty->print_cr("ERROR: Klass not yet initialized!!");
1374 receiver_klass->print();
1375 }
1376 assert(!InstanceKlass::cast(receiver_klass)->is_not_initialized(), "receiver_klass must be initialized");
1377 }
1378 }
1379 #endif
1380
1381 return receiver;
1382 }
1383
1384 methodHandle SharedRuntime::find_callee_method(bool& caller_does_not_scalarize, TRAPS) {
1385 JavaThread* current = THREAD;
1386 ResourceMark rm(current);
1387 // We need first to check if any Java activations (compiled, interpreted)
1388 // exist on the stack since last JavaCall. If not, we need
1389 // to get the target method from the JavaCall wrapper.
1390 vframeStream vfst(current, true); // Do not skip any javaCalls
1391 methodHandle callee_method;
1392 if (vfst.at_end()) {
1393 // No Java frames were found on stack since we did the JavaCall.
1394 // Hence the stack can only contain an entry_frame. We need to
1395 // find the target method from the stub frame.
1396 RegisterMap reg_map(current,
1397 RegisterMap::UpdateMap::skip,
1398 RegisterMap::ProcessFrames::include,
1399 RegisterMap::WalkContinuation::skip);
1400 frame fr = current->last_frame();
1401 assert(fr.is_runtime_frame(), "must be a runtimeStub");
1402 fr = fr.sender(®_map);
1403 assert(fr.is_entry_frame(), "must be");
1404 // fr is now pointing to the entry frame.
1405 callee_method = methodHandle(current, fr.entry_frame_call_wrapper()->callee_method());
1406 } else {
1407 Bytecodes::Code bc;
1408 CallInfo callinfo;
1409 find_callee_info_helper(vfst, bc, callinfo, CHECK_(methodHandle()));
1410 // Calls via mismatching methods are always non-scalarized
1411 if (callinfo.resolved_method()->mismatch()) {
1412 caller_does_not_scalarize = true;
1413 }
1414 callee_method = methodHandle(current, callinfo.selected_method());
1415 }
1416 assert(callee_method()->is_method(), "must be");
1417 return callee_method;
1418 }
1419
1420 // Resolves a call.
1421 methodHandle SharedRuntime::resolve_helper(bool is_virtual, bool is_optimized, bool& caller_does_not_scalarize, TRAPS) {
1422 JavaThread* current = THREAD;
1423 ResourceMark rm(current);
1424 RegisterMap cbl_map(current,
1425 RegisterMap::UpdateMap::skip,
1426 RegisterMap::ProcessFrames::include,
1427 RegisterMap::WalkContinuation::skip);
1428 frame caller_frame = current->last_frame().sender(&cbl_map);
1429
1430 CodeBlob* caller_cb = caller_frame.cb();
1431 guarantee(caller_cb != nullptr && caller_cb->is_nmethod(), "must be called from compiled method");
1432 nmethod* caller_nm = caller_cb->as_nmethod();
1433
1434 // determine call info & receiver
1435 // note: a) receiver is null for static calls
1436 // b) an exception is thrown if receiver is null for non-static calls
1437 CallInfo call_info;
1438 Bytecodes::Code invoke_code = Bytecodes::_illegal;
1439 Handle receiver = find_callee_info(invoke_code, call_info, CHECK_(methodHandle()));
1440
1441 NoSafepointVerifier nsv;
1442
1443 methodHandle callee_method(current, call_info.selected_method());
1444 // Calls via mismatching methods are always non-scalarized
1445 if (caller_nm->is_compiled_by_c1() || call_info.resolved_method()->mismatch()) {
1446 caller_does_not_scalarize = true;
1447 }
1448
1449 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic ) ||
1450 (!is_virtual && invoke_code == Bytecodes::_invokespecial) ||
1451 (!is_virtual && invoke_code == Bytecodes::_invokehandle ) ||
1452 (!is_virtual && invoke_code == Bytecodes::_invokedynamic) ||
1453 ( is_virtual && invoke_code != Bytecodes::_invokestatic ), "inconsistent bytecode");
1454
1455 assert(!caller_nm->is_unloading(), "It should not be unloading");
1456
1457 #ifndef PRODUCT
1458 // tracing/debugging/statistics
1459 uint *addr = (is_optimized) ? (&_resolve_opt_virtual_ctr) :
1460 (is_virtual) ? (&_resolve_virtual_ctr) :
1461 (&_resolve_static_ctr);
1462 AtomicAccess::inc(addr);
1463
1464 if (TraceCallFixup) {
1465 ResourceMark rm(current);
1466 tty->print("resolving %s%s (%s) %s call to",
1467 (is_optimized) ? "optimized " : "", (is_virtual) ? "virtual" : "static",
1468 Bytecodes::name(invoke_code), (caller_does_not_scalarize) ? "non-scalar" : "");
1469 callee_method->print_short_name(tty);
1470 tty->print_cr(" at pc: " INTPTR_FORMAT " to code: " INTPTR_FORMAT,
1471 p2i(caller_frame.pc()), p2i(callee_method->code()));
1472 }
1473 #endif
1474
1475 if (invoke_code == Bytecodes::_invokestatic) {
1476 assert(callee_method->method_holder()->is_initialized() ||
1477 callee_method->method_holder()->is_reentrant_initialization(current),
1478 "invalid class initialization state for invoke_static");
1479 if (!VM_Version::supports_fast_class_init_checks() && callee_method->needs_clinit_barrier()) {
1480 // In order to keep class initialization check, do not patch call
1481 // site for static call when the class is not fully initialized.
1482 // Proper check is enforced by call site re-resolution on every invocation.
1483 //
1484 // When fast class initialization checks are supported (VM_Version::supports_fast_class_init_checks() == true),
1485 // explicit class initialization check is put in nmethod entry (VEP).
1486 assert(callee_method->method_holder()->is_linked(), "must be");
1487 return callee_method;
1488 }
1489 }
1490
1491
1492 // JSR 292 key invariant:
1493 // If the resolved method is a MethodHandle invoke target, the call
1494 // site must be a MethodHandle call site, because the lambda form might tail-call
1495 // leaving the stack in a state unknown to either caller or callee
1496
1497 // Compute entry points. The computation of the entry points is independent of
1498 // patching the call.
1499
1500 // Make sure the callee nmethod does not get deoptimized and removed before
1501 // we are done patching the code.
1502
1503
1504 CompiledICLocker ml(caller_nm);
1505 if (is_virtual && !is_optimized) {
1506 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1507 inline_cache->update(&call_info, receiver->klass(), caller_does_not_scalarize);
1508 } else {
1509 // Callsite is a direct call - set it to the destination method
1510 CompiledDirectCall* callsite = CompiledDirectCall::before(caller_frame.pc());
1511 callsite->set(callee_method, caller_does_not_scalarize);
1512 }
1513
1514 return callee_method;
1515 }
1516
1517 // Inline caches exist only in compiled code
1518 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* current))
1519 #ifdef ASSERT
1520 RegisterMap reg_map(current,
1521 RegisterMap::UpdateMap::skip,
1522 RegisterMap::ProcessFrames::include,
1523 RegisterMap::WalkContinuation::skip);
1524 frame stub_frame = current->last_frame();
1525 assert(stub_frame.is_runtime_frame(), "sanity check");
1526 frame caller_frame = stub_frame.sender(®_map);
1527 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame() && !caller_frame.is_upcall_stub_frame(), "unexpected frame");
1528 #endif /* ASSERT */
1529
1530 methodHandle callee_method;
1531 bool caller_does_not_scalarize = false;
1532 JRT_BLOCK
1533 callee_method = SharedRuntime::handle_ic_miss_helper(caller_does_not_scalarize, CHECK_NULL);
1534 // Return Method* through TLS
1535 current->set_vm_result_metadata(callee_method());
1536 JRT_BLOCK_END
1537 // return compiled code entry point after potential safepoints
1538 return get_resolved_entry(current, callee_method, false, false, caller_does_not_scalarize);
1539 JRT_END
1540
1541
1542 // Handle call site that has been made non-entrant
1543 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* current))
1544 // 6243940 We might end up in here if the callee is deoptimized
1545 // as we race to call it. We don't want to take a safepoint if
1546 // the caller was interpreted because the caller frame will look
1547 // interpreted to the stack walkers and arguments are now
1548 // "compiled" so it is much better to make this transition
1549 // invisible to the stack walking code. The i2c path will
1550 // place the callee method in the callee_target. It is stashed
1551 // there because if we try and find the callee by normal means a
1552 // safepoint is possible and have trouble gc'ing the compiled args.
1553 RegisterMap reg_map(current,
1554 RegisterMap::UpdateMap::skip,
1555 RegisterMap::ProcessFrames::include,
1556 RegisterMap::WalkContinuation::skip);
1557 frame stub_frame = current->last_frame();
1558 assert(stub_frame.is_runtime_frame(), "sanity check");
1559 frame caller_frame = stub_frame.sender(®_map);
1560
1561 if (caller_frame.is_interpreted_frame() ||
1562 caller_frame.is_entry_frame() ||
1563 caller_frame.is_upcall_stub_frame()) {
1564 Method* callee = current->callee_target();
1565 guarantee(callee != nullptr && callee->is_method(), "bad handshake");
1566 current->set_vm_result_metadata(callee);
1567 current->set_callee_target(nullptr);
1568 if (caller_frame.is_entry_frame() && VM_Version::supports_fast_class_init_checks()) {
1569 // Bypass class initialization checks in c2i when caller is in native.
1570 // JNI calls to static methods don't have class initialization checks.
1571 // Fast class initialization checks are present in c2i adapters and call into
1572 // SharedRuntime::handle_wrong_method() on the slow path.
1573 //
1574 // JVM upcalls may land here as well, but there's a proper check present in
1575 // LinkResolver::resolve_static_call (called from JavaCalls::call_static),
1576 // so bypassing it in c2i adapter is benign.
1577 return callee->get_c2i_no_clinit_check_entry();
1578 } else {
1579 if (caller_frame.is_interpreted_frame()) {
1580 return callee->get_c2i_inline_entry();
1581 } else {
1582 return callee->get_c2i_entry();
1583 }
1584 }
1585 }
1586
1587 // Must be compiled to compiled path which is safe to stackwalk
1588 methodHandle callee_method;
1589 bool is_static_call = false;
1590 bool is_optimized = false;
1591 bool caller_does_not_scalarize = false;
1592 JRT_BLOCK
1593 // Force resolving of caller (if we called from compiled frame)
1594 callee_method = SharedRuntime::reresolve_call_site(is_optimized, caller_does_not_scalarize, CHECK_NULL);
1595 current->set_vm_result_metadata(callee_method());
1596 JRT_BLOCK_END
1597 // return compiled code entry point after potential safepoints
1598 return get_resolved_entry(current, callee_method, callee_method->is_static(), is_optimized, caller_does_not_scalarize);
1599 JRT_END
1600
1601 // Handle abstract method call
1602 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_abstract(JavaThread* current))
1603 // Verbose error message for AbstractMethodError.
1604 // Get the called method from the invoke bytecode.
1605 vframeStream vfst(current, true);
1606 assert(!vfst.at_end(), "Java frame must exist");
1607 methodHandle caller(current, vfst.method());
1608 Bytecode_invoke invoke(caller, vfst.bci());
1609 DEBUG_ONLY( invoke.verify(); )
1610
1611 // Find the compiled caller frame.
1612 RegisterMap reg_map(current,
1613 RegisterMap::UpdateMap::include,
1614 RegisterMap::ProcessFrames::include,
1615 RegisterMap::WalkContinuation::skip);
1616 frame stubFrame = current->last_frame();
1617 assert(stubFrame.is_runtime_frame(), "must be");
1618 frame callerFrame = stubFrame.sender(®_map);
1619 assert(callerFrame.is_compiled_frame(), "must be");
1620
1621 // Install exception and return forward entry.
1622 address res = SharedRuntime::throw_AbstractMethodError_entry();
1623 JRT_BLOCK
1624 methodHandle callee(current, invoke.static_target(current));
1625 if (!callee.is_null()) {
1626 oop recv = callerFrame.retrieve_receiver(®_map);
1627 Klass *recv_klass = (recv != nullptr) ? recv->klass() : nullptr;
1628 res = StubRoutines::forward_exception_entry();
1629 LinkResolver::throw_abstract_method_error(callee, recv_klass, CHECK_(res));
1630 }
1631 JRT_BLOCK_END
1632 return res;
1633 JRT_END
1634
1635 // return verified_code_entry if interp_only_mode is not set for the current thread;
1636 // otherwise return c2i entry.
1637 address SharedRuntime::get_resolved_entry(JavaThread* current, methodHandle callee_method,
1638 bool is_static_call, bool is_optimized, bool caller_does_not_scalarize) {
1639 bool is_interp_only_mode = (StressCallingConvention && (os::random() % (1 << 10)) == 0) || current->is_interp_only_mode();
1640 // In interp_only_mode we need to go to the interpreted entry
1641 // The c2i won't patch in this mode -- see fixup_callers_callsite
1642 bool go_to_interpreter = is_interp_only_mode && !callee_method->is_special_native_intrinsic();
1643
1644 if (caller_does_not_scalarize) {
1645 if (go_to_interpreter) {
1646 return callee_method->get_c2i_inline_entry();
1647 }
1648 assert(callee_method->verified_inline_code_entry() != nullptr, "Jump to zero!");
1649 return callee_method->verified_inline_code_entry();
1650 } else if (is_static_call || is_optimized) {
1651 if (go_to_interpreter) {
1652 return callee_method->get_c2i_entry();
1653 }
1654 assert(callee_method->verified_code_entry() != nullptr, "Jump to zero!");
1655 return callee_method->verified_code_entry();
1656 } else {
1657 if (go_to_interpreter) {
1658 return callee_method->get_c2i_inline_ro_entry();
1659 }
1660 assert(callee_method->verified_inline_ro_code_entry() != nullptr, "Jump to zero!");
1661 return callee_method->verified_inline_ro_code_entry();
1662 }
1663 }
1664
1665 // resolve a static call and patch code
1666 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread* current ))
1667 methodHandle callee_method;
1668 bool caller_does_not_scalarize = false;
1669 bool enter_special = false;
1670 JRT_BLOCK
1671 callee_method = SharedRuntime::resolve_helper(false, false, caller_does_not_scalarize, CHECK_NULL);
1672 current->set_vm_result_metadata(callee_method());
1673 JRT_BLOCK_END
1674 // return compiled code entry point after potential safepoints
1675 return get_resolved_entry(current, callee_method, true, false, caller_does_not_scalarize);
1676 JRT_END
1677
1678 // resolve virtual call and update inline cache to monomorphic
1679 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread* current))
1680 methodHandle callee_method;
1681 bool caller_does_not_scalarize = false;
1682 JRT_BLOCK
1683 callee_method = SharedRuntime::resolve_helper(true, false, caller_does_not_scalarize, CHECK_NULL);
1684 current->set_vm_result_metadata(callee_method());
1685 JRT_BLOCK_END
1686 // return compiled code entry point after potential safepoints
1687 return get_resolved_entry(current, callee_method, false, false, caller_does_not_scalarize);
1688 JRT_END
1689
1690
1691 // Resolve a virtual call that can be statically bound (e.g., always
1692 // monomorphic, so it has no inline cache). Patch code to resolved target.
1693 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread* current))
1694 methodHandle callee_method;
1695 bool caller_does_not_scalarize = false;
1696 JRT_BLOCK
1697 callee_method = SharedRuntime::resolve_helper(true, true, caller_does_not_scalarize, CHECK_NULL);
1698 current->set_vm_result_metadata(callee_method());
1699 JRT_BLOCK_END
1700 // return compiled code entry point after potential safepoints
1701 return get_resolved_entry(current, callee_method, false, true, caller_does_not_scalarize);
1702 JRT_END
1703
1704
1705
1706 methodHandle SharedRuntime::handle_ic_miss_helper(bool& caller_does_not_scalarize, TRAPS) {
1707 JavaThread* current = THREAD;
1708 ResourceMark rm(current);
1709 CallInfo call_info;
1710 Bytecodes::Code bc;
1711
1712 // receiver is null for static calls. An exception is thrown for null
1713 // receivers for non-static calls
1714 Handle receiver = find_callee_info(bc, call_info, CHECK_(methodHandle()));
1715
1716 methodHandle callee_method(current, call_info.selected_method());
1717
1718 #ifndef PRODUCT
1719 AtomicAccess::inc(&_ic_miss_ctr);
1720
1721 // Statistics & Tracing
1722 if (TraceCallFixup) {
1723 ResourceMark rm(current);
1724 tty->print("IC miss (%s) %s call to", Bytecodes::name(bc), (caller_does_not_scalarize) ? "non-scalar" : "");
1725 callee_method->print_short_name(tty);
1726 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1727 }
1728
1729 if (ICMissHistogram) {
1730 MutexLocker m(VMStatistic_lock);
1731 RegisterMap reg_map(current,
1732 RegisterMap::UpdateMap::skip,
1733 RegisterMap::ProcessFrames::include,
1734 RegisterMap::WalkContinuation::skip);
1735 frame f = current->last_frame().real_sender(®_map);// skip runtime stub
1736 // produce statistics under the lock
1737 trace_ic_miss(f.pc());
1738 }
1739 #endif
1740
1741 // install an event collector so that when a vtable stub is created the
1742 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The
1743 // event can't be posted when the stub is created as locks are held
1744 // - instead the event will be deferred until the event collector goes
1745 // out of scope.
1746 JvmtiDynamicCodeEventCollector event_collector;
1747
1748 // Update inline cache to megamorphic. Skip update if we are called from interpreted.
1749 RegisterMap reg_map(current,
1750 RegisterMap::UpdateMap::skip,
1751 RegisterMap::ProcessFrames::include,
1752 RegisterMap::WalkContinuation::skip);
1753 frame caller_frame = current->last_frame().sender(®_map);
1754 CodeBlob* cb = caller_frame.cb();
1755 nmethod* caller_nm = cb->as_nmethod();
1756 // Calls via mismatching methods are always non-scalarized
1757 if (caller_nm->is_compiled_by_c1() || call_info.resolved_method()->mismatch()) {
1758 caller_does_not_scalarize = true;
1759 }
1760
1761 CompiledICLocker ml(caller_nm);
1762 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1763 inline_cache->update(&call_info, receiver()->klass(), caller_does_not_scalarize);
1764
1765 return callee_method;
1766 }
1767
1768 //
1769 // Resets a call-site in compiled code so it will get resolved again.
1770 // This routines handles both virtual call sites, optimized virtual call
1771 // sites, and static call sites. Typically used to change a call sites
1772 // destination from compiled to interpreted.
1773 //
1774 methodHandle SharedRuntime::reresolve_call_site(bool& is_optimized, bool& caller_does_not_scalarize, TRAPS) {
1775 JavaThread* current = THREAD;
1776 ResourceMark rm(current);
1777 RegisterMap reg_map(current,
1778 RegisterMap::UpdateMap::skip,
1779 RegisterMap::ProcessFrames::include,
1780 RegisterMap::WalkContinuation::skip);
1781 frame stub_frame = current->last_frame();
1782 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub");
1783 frame caller = stub_frame.sender(®_map);
1784 if (caller.is_compiled_frame()) {
1785 caller_does_not_scalarize = caller.cb()->as_nmethod()->is_compiled_by_c1();
1786 }
1787 assert(!caller.is_interpreted_frame(), "must be compiled");
1788
1789 // If the frame isn't a live compiled frame (i.e. deoptimized by the time we get here), no IC clearing must be done
1790 // for the caller. However, when the caller is C2 compiled and the callee a C1 or C2 compiled method, then we still
1791 // need to figure out whether it was an optimized virtual call with an inline type receiver. Otherwise, we end up
1792 // using the wrong method entry point and accidentally skip the buffering of the receiver.
1793 methodHandle callee_method = find_callee_method(caller_does_not_scalarize, CHECK_(methodHandle()));
1794 const bool caller_is_compiled_and_not_deoptimized = caller.is_compiled_frame() && !caller.is_deoptimized_frame();
1795 const bool caller_is_continuation_enter_intrinsic =
1796 caller.is_native_frame() && caller.cb()->as_nmethod()->method()->is_continuation_enter_intrinsic();
1797 const bool do_IC_clearing = caller_is_compiled_and_not_deoptimized || caller_is_continuation_enter_intrinsic;
1798
1799 const bool callee_compiled_with_scalarized_receiver = callee_method->has_compiled_code() &&
1800 !callee_method()->is_static() &&
1801 callee_method()->is_scalarized_arg(0);
1802 const bool compute_is_optimized = !caller_does_not_scalarize && callee_compiled_with_scalarized_receiver;
1803
1804 if (do_IC_clearing || compute_is_optimized) {
1805 address pc = caller.pc();
1806
1807 nmethod* caller_nm = CodeCache::find_nmethod(pc);
1808 assert(caller_nm != nullptr, "did not find caller nmethod");
1809
1810 // Default call_addr is the location of the "basic" call.
1811 // Determine the address of the call we a reresolving. With
1812 // Inline Caches we will always find a recognizable call.
1813 // With Inline Caches disabled we may or may not find a
1814 // recognizable call. We will always find a call for static
1815 // calls and for optimized virtual calls. For vanilla virtual
1816 // calls it depends on the state of the UseInlineCaches switch.
1817 //
1818 // With Inline Caches disabled we can get here for a virtual call
1819 // for two reasons:
1820 // 1 - calling an abstract method. The vtable for abstract methods
1821 // will run us thru handle_wrong_method and we will eventually
1822 // end up in the interpreter to throw the ame.
1823 // 2 - a racing deoptimization. We could be doing a vanilla vtable
1824 // call and between the time we fetch the entry address and
1825 // we jump to it the target gets deoptimized. Similar to 1
1826 // we will wind up in the interprter (thru a c2i with c2).
1827 //
1828 CompiledICLocker ml(caller_nm);
1829 address call_addr = caller_nm->call_instruction_address(pc);
1830
1831 if (call_addr != nullptr) {
1832 // On x86 the logic for finding a call instruction is blindly checking for a call opcode 5
1833 // bytes back in the instruction stream so we must also check for reloc info.
1834 RelocIterator iter(caller_nm, call_addr, call_addr+1);
1835 bool ret = iter.next(); // Get item
1836 if (ret) {
1837 is_optimized = false;
1838 switch (iter.type()) {
1839 case relocInfo::static_call_type:
1840 assert(callee_method->is_static(), "must be");
1841 case relocInfo::opt_virtual_call_type: {
1842 is_optimized = (iter.type() == relocInfo::opt_virtual_call_type);
1843 if (do_IC_clearing) {
1844 CompiledDirectCall* cdc = CompiledDirectCall::at(call_addr);
1845 cdc->set_to_clean();
1846 }
1847 break;
1848 }
1849 case relocInfo::virtual_call_type: {
1850 if (do_IC_clearing) {
1851 // compiled, dispatched call (which used to call an interpreted method)
1852 CompiledIC* inline_cache = CompiledIC_at(caller_nm, call_addr);
1853 inline_cache->set_to_clean();
1854 }
1855 break;
1856 }
1857 default:
1858 break;
1859 }
1860 }
1861 }
1862 }
1863
1864 #ifndef PRODUCT
1865 AtomicAccess::inc(&_wrong_method_ctr);
1866
1867 if (TraceCallFixup) {
1868 ResourceMark rm(current);
1869 tty->print("handle_wrong_method reresolving %s call to", (caller_does_not_scalarize) ? "non-scalar" : "");
1870 callee_method->print_short_name(tty);
1871 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1872 }
1873 #endif
1874
1875 return callee_method;
1876 }
1877
1878 address SharedRuntime::handle_unsafe_access(JavaThread* thread, address next_pc) {
1879 // The faulting unsafe accesses should be changed to throw the error
1880 // synchronously instead. Meanwhile the faulting instruction will be
1881 // skipped over (effectively turning it into a no-op) and an
1882 // asynchronous exception will be raised which the thread will
1883 // handle at a later point. If the instruction is a load it will
1884 // return garbage.
1885
1886 // Request an async exception.
1887 thread->set_pending_unsafe_access_error();
1888
1889 // Return address of next instruction to execute.
2055 msglen += strlen(caster_klass_description) + strlen(target_klass_description) + strlen(klass_separator) + 3;
2056
2057 char* message = NEW_RESOURCE_ARRAY_RETURN_NULL(char, msglen);
2058 if (message == nullptr) {
2059 // Shouldn't happen, but don't cause even more problems if it does
2060 message = const_cast<char*>(caster_klass->external_name());
2061 } else {
2062 jio_snprintf(message,
2063 msglen,
2064 "class %s cannot be cast to class %s (%s%s%s)",
2065 caster_name,
2066 target_name,
2067 caster_klass_description,
2068 klass_separator,
2069 target_klass_description
2070 );
2071 }
2072 return message;
2073 }
2074
2075 char* SharedRuntime::generate_identity_exception_message(JavaThread* current, Klass* klass) {
2076 assert(klass->is_inline_klass(), "Must be a concrete value class");
2077 const char* desc = "Cannot synchronize on an instance of value class ";
2078 const char* className = klass->external_name();
2079 size_t msglen = strlen(desc) + strlen(className) + 1;
2080 char* message = NEW_RESOURCE_ARRAY(char, msglen);
2081 if (nullptr == message) {
2082 // Out of memory: can't create detailed error message
2083 message = const_cast<char*>(klass->external_name());
2084 } else {
2085 jio_snprintf(message, msglen, "%s%s", desc, className);
2086 }
2087 return message;
2088 }
2089
2090 JRT_LEAF(void, SharedRuntime::reguard_yellow_pages())
2091 (void) JavaThread::current()->stack_overflow_state()->reguard_stack();
2092 JRT_END
2093
2094 void SharedRuntime::monitor_enter_helper(oopDesc* obj, BasicLock* lock, JavaThread* current) {
2095 if (!SafepointSynchronize::is_synchronizing()) {
2096 // Only try quick_enter() if we're not trying to reach a safepoint
2097 // so that the calling thread reaches the safepoint more quickly.
2098 if (ObjectSynchronizer::quick_enter(obj, lock, current)) {
2099 return;
2100 }
2101 }
2102 // NO_ASYNC required because an async exception on the state transition destructor
2103 // would leave you with the lock held and it would never be released.
2104 // The normal monitorenter NullPointerException is thrown without acquiring a lock
2105 // and the model is that an exception implies the method failed.
2106 JRT_BLOCK_NO_ASYNC
2107 Handle h_obj(THREAD, obj);
2108 ObjectSynchronizer::enter(h_obj, lock, current);
2109 assert(!HAS_PENDING_EXCEPTION, "Should have no exception here");
2303 tty->print_cr("Note 1: counter updates are not MT-safe.");
2304 tty->print_cr("Note 2: %% in major categories are relative to total non-inlined calls;");
2305 tty->print_cr(" %% in nested categories are relative to their category");
2306 tty->print_cr(" (and thus add up to more than 100%% with inlining)");
2307 tty->cr();
2308
2309 MethodArityHistogram h;
2310 }
2311 #endif
2312
2313 #ifndef PRODUCT
2314 static int _lookups; // number of calls to lookup
2315 static int _equals; // number of buckets checked with matching hash
2316 static int _archived_hits; // number of successful lookups in archived table
2317 static int _runtime_hits; // number of successful lookups in runtime table
2318 #endif
2319
2320 // A simple wrapper class around the calling convention information
2321 // that allows sharing of adapters for the same calling convention.
2322 class AdapterFingerPrint : public MetaspaceObj {
2323 public:
2324 class Element {
2325 private:
2326 // The highest byte is the type of the argument. The remaining bytes contain the offset of the
2327 // field if it is flattened in the calling convention, -1 otherwise.
2328 juint _payload;
2329
2330 static constexpr int offset_bit_width = 24;
2331 static constexpr juint offset_bit_mask = (1 << offset_bit_width) - 1;
2332 public:
2333 Element(BasicType bt, int offset) : _payload((static_cast<juint>(bt) << offset_bit_width) | (juint(offset) & offset_bit_mask)) {
2334 assert(offset >= -1 && offset < jint(offset_bit_mask), "invalid offset %d", offset);
2335 }
2336
2337 BasicType bt() const {
2338 return static_cast<BasicType>(_payload >> offset_bit_width);
2339 }
2340
2341 int offset() const {
2342 juint res = _payload & offset_bit_mask;
2343 return res == offset_bit_mask ? -1 : res;
2344 }
2345
2346 juint hash() const {
2347 return _payload;
2348 }
2349
2350 bool operator!=(const Element& other) const {
2351 return _payload != other._payload;
2352 }
2353 };
2354
2355 private:
2356 const bool _has_ro_adapter;
2357 const int _length;
2358
2359 static int data_offset() { return sizeof(AdapterFingerPrint); }
2360 Element* data_pointer() {
2361 return reinterpret_cast<Element*>(reinterpret_cast<address>(this) + data_offset());
2362 }
2363
2364 const Element& element_at(int index) {
2365 assert(index < length(), "index %d out of bounds for length %d", index, length());
2366 Element* data = data_pointer();
2367 return data[index];
2368 }
2369
2370 // Private construtor. Use allocate() to get an instance.
2371 AdapterFingerPrint(const GrowableArray<SigEntry>* sig, bool has_ro_adapter)
2372 : _has_ro_adapter(has_ro_adapter), _length(total_args_passed_in_sig(sig)) {
2373 Element* data = data_pointer();
2374 BasicType prev_bt = T_ILLEGAL;
2375 int vt_count = 0;
2376 for (int index = 0; index < _length; index++) {
2377 const SigEntry& sig_entry = sig->at(index);
2378 BasicType bt = sig_entry._bt;
2379 if (bt == T_METADATA) {
2380 // Found start of inline type in signature
2381 assert(InlineTypePassFieldsAsArgs, "unexpected start of inline type");
2382 vt_count++;
2383 } else if (bt == T_VOID && prev_bt != T_LONG && prev_bt != T_DOUBLE) {
2384 // Found end of inline type in signature
2385 assert(InlineTypePassFieldsAsArgs, "unexpected end of inline type");
2386 vt_count--;
2387 assert(vt_count >= 0, "invalid vt_count");
2388 } else if (vt_count == 0) {
2389 // Widen fields that are not part of a scalarized inline type argument
2390 assert(sig_entry._offset == -1, "invalid offset for argument that is not a flattened field %d", sig_entry._offset);
2391 bt = adapter_encoding(bt);
2392 }
2393
2394 ::new(&data[index]) Element(bt, sig_entry._offset);
2395 prev_bt = bt;
2396 }
2397 assert(vt_count == 0, "invalid vt_count");
2398 }
2399
2400 // Call deallocate instead
2401 ~AdapterFingerPrint() {
2402 ShouldNotCallThis();
2403 }
2404
2405 static int total_args_passed_in_sig(const GrowableArray<SigEntry>* sig) {
2406 return (sig != nullptr) ? sig->length() : 0;
2407 }
2408
2409 static int compute_size_in_words(int len) {
2410 return (int)heap_word_size(sizeof(AdapterFingerPrint) + (len * sizeof(Element)));
2411 }
2412
2413 // Remap BasicTypes that are handled equivalently by the adapters.
2414 // These are correct for the current system but someday it might be
2415 // necessary to make this mapping platform dependent.
2416 static BasicType adapter_encoding(BasicType in) {
2417 switch (in) {
2418 case T_BOOLEAN:
2419 case T_BYTE:
2420 case T_SHORT:
2421 case T_CHAR:
2422 // They are all promoted to T_INT in the calling convention
2423 return T_INT;
2424
2425 case T_OBJECT:
2426 case T_ARRAY:
2427 // In other words, we assume that any register good enough for
2428 // an int or long is good enough for a managed pointer.
2429 #ifdef _LP64
2430 return T_LONG;
2431 #else
2432 return T_INT;
2433 #endif
2434
2435 case T_INT:
2436 case T_LONG:
2437 case T_FLOAT:
2438 case T_DOUBLE:
2439 case T_VOID:
2440 return in;
2441
2442 default:
2443 ShouldNotReachHere();
2444 return T_CONFLICT;
2445 }
2446 }
2447
2448 void* operator new(size_t size, size_t fp_size) throw() {
2449 assert(fp_size >= size, "sanity check");
2450 void* p = AllocateHeap(fp_size, mtCode);
2451 memset(p, 0, fp_size);
2452 return p;
2453 }
2454
2455 public:
2456 template<typename Function>
2457 void iterate_args(Function function) {
2458 for (int i = 0; i < length(); i++) {
2459 function(element_at(i));
2460 }
2461 }
2462
2463 static AdapterFingerPrint* allocate(const GrowableArray<SigEntry>* sig, bool has_ro_adapter = false) {
2464 int len = total_args_passed_in_sig(sig);
2465 int size_in_bytes = BytesPerWord * compute_size_in_words(len);
2466 AdapterFingerPrint* afp = new (size_in_bytes) AdapterFingerPrint(sig, has_ro_adapter);
2467 assert((afp->size() * BytesPerWord) == size_in_bytes, "should match");
2468 return afp;
2469 }
2470
2471 static void deallocate(AdapterFingerPrint* fp) {
2472 FreeHeap(fp);
2473 }
2474
2475 bool has_ro_adapter() const {
2476 return _has_ro_adapter;
2477 }
2478
2479 int length() const {
2480 return _length;
2481 }
2482
2483 unsigned int compute_hash() {
2484 int hash = 0;
2485 for (int i = 0; i < length(); i++) {
2486 const Element& v = element_at(i);
2487 //Add arithmetic operation to the hash, like +3 to improve hashing
2488 hash = ((hash << 8) ^ v.hash() ^ (hash >> 5)) + 3;
2489 }
2490 return (unsigned int)hash;
2491 }
2492
2493 const char* as_string() {
2494 stringStream st;
2495 st.print("{");
2496 if (_has_ro_adapter) {
2497 st.print("has_ro_adapter");
2498 } else {
2499 st.print("no_ro_adapter");
2500 }
2501 for (int i = 0; i < length(); i++) {
2502 st.print(", ");
2503 const Element& elem = element_at(i);
2504 st.print("{%s, %d}", type2name(elem.bt()), elem.offset());
2505 }
2506 st.print("}");
2507 return st.as_string();
2508 }
2509
2510 const char* as_basic_args_string() {
2511 stringStream st;
2512 bool long_prev = false;
2513 iterate_args([&] (const Element& arg) {
2514 if (long_prev) {
2515 long_prev = false;
2516 if (arg.bt() == T_VOID) {
2517 st.print("J");
2518 } else {
2519 st.print("L");
2520 }
2521 }
2522 if (arg.bt() == T_LONG) {
2523 long_prev = true;
2524 } else if (arg.bt() != T_VOID) {
2525 st.print("%c", type2char(arg.bt()));
2526 }
2527 });
2528 if (long_prev) {
2529 st.print("L");
2530 }
2531 return st.as_string();
2532 }
2533
2534 bool equals(AdapterFingerPrint* other) {
2535 if (other->_has_ro_adapter != _has_ro_adapter) {
2536 return false;
2537 } else if (other->_length != _length) {
2538 return false;
2539 } else {
2540 for (int i = 0; i < _length; i++) {
2541 if (element_at(i) != other->element_at(i)) {
2542 return false;
2543 }
2544 }
2545 }
2546 return true;
2547 }
2548
2549 // methods required by virtue of being a MetaspaceObj
2550 void metaspace_pointers_do(MetaspaceClosure* it) { return; /* nothing to do here */ }
2551 int size() const { return compute_size_in_words(_length); }
2552 MetaspaceObj::Type type() const { return AdapterFingerPrintType; }
2553
2554 static bool equals(AdapterFingerPrint* const& fp1, AdapterFingerPrint* const& fp2) {
2555 NOT_PRODUCT(_equals++);
2556 return fp1->equals(fp2);
2557 }
2558
2559 static unsigned int compute_hash(AdapterFingerPrint* const& fp) {
2560 return fp->compute_hash();
2561 }
2564 #if INCLUDE_CDS
2565 static inline bool adapter_fp_equals_compact_hashtable_entry(AdapterHandlerEntry* entry, AdapterFingerPrint* fp, int len_unused) {
2566 return AdapterFingerPrint::equals(entry->fingerprint(), fp);
2567 }
2568
2569 class ArchivedAdapterTable : public OffsetCompactHashtable<
2570 AdapterFingerPrint*,
2571 AdapterHandlerEntry*,
2572 adapter_fp_equals_compact_hashtable_entry> {};
2573 #endif // INCLUDE_CDS
2574
2575 // A hashtable mapping from AdapterFingerPrints to AdapterHandlerEntries
2576 using AdapterHandlerTable = HashTable<AdapterFingerPrint*, AdapterHandlerEntry*, 293,
2577 AnyObj::C_HEAP, mtCode,
2578 AdapterFingerPrint::compute_hash,
2579 AdapterFingerPrint::equals>;
2580 static AdapterHandlerTable* _adapter_handler_table;
2581 static GrowableArray<AdapterHandlerEntry*>* _adapter_handler_list = nullptr;
2582
2583 // Find a entry with the same fingerprint if it exists
2584 AdapterHandlerEntry* AdapterHandlerLibrary::lookup(const GrowableArray<SigEntry>* sig, bool has_ro_adapter) {
2585 NOT_PRODUCT(_lookups++);
2586 assert_lock_strong(AdapterHandlerLibrary_lock);
2587 AdapterFingerPrint* fp = AdapterFingerPrint::allocate(sig, has_ro_adapter);
2588 AdapterHandlerEntry* entry = nullptr;
2589 #if INCLUDE_CDS
2590 // if we are building the archive then the archived adapter table is
2591 // not valid and we need to use the ones added to the runtime table
2592 if (AOTCodeCache::is_using_adapter()) {
2593 // Search archived table first. It is read-only table so can be searched without lock
2594 entry = _aot_adapter_handler_table.lookup(fp, fp->compute_hash(), 0 /* unused */);
2595 #ifndef PRODUCT
2596 if (entry != nullptr) {
2597 _archived_hits++;
2598 }
2599 #endif
2600 }
2601 #endif // INCLUDE_CDS
2602 if (entry == nullptr) {
2603 assert_lock_strong(AdapterHandlerLibrary_lock);
2604 AdapterHandlerEntry** entry_p = _adapter_handler_table->get(fp);
2605 if (entry_p != nullptr) {
2606 entry = *entry_p;
2607 assert(entry->fingerprint()->equals(fp), "fingerprint mismatch key fp %s %s (hash=%d) != found fp %s %s (hash=%d)",
2624 TableStatistics ts = _adapter_handler_table->statistics_calculate(size);
2625 ts.print(tty, "AdapterHandlerTable");
2626 tty->print_cr("AdapterHandlerTable (table_size=%d, entries=%d)",
2627 _adapter_handler_table->table_size(), _adapter_handler_table->number_of_entries());
2628 int total_hits = _archived_hits + _runtime_hits;
2629 tty->print_cr("AdapterHandlerTable: lookups %d equals %d hits %d (archived=%d+runtime=%d)",
2630 _lookups, _equals, total_hits, _archived_hits, _runtime_hits);
2631 }
2632 #endif
2633
2634 // ---------------------------------------------------------------------------
2635 // Implementation of AdapterHandlerLibrary
2636 AdapterHandlerEntry* AdapterHandlerLibrary::_no_arg_handler = nullptr;
2637 AdapterHandlerEntry* AdapterHandlerLibrary::_int_arg_handler = nullptr;
2638 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_arg_handler = nullptr;
2639 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_int_arg_handler = nullptr;
2640 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_obj_arg_handler = nullptr;
2641 #if INCLUDE_CDS
2642 ArchivedAdapterTable AdapterHandlerLibrary::_aot_adapter_handler_table;
2643 #endif // INCLUDE_CDS
2644 static const int AdapterHandlerLibrary_size = 48*K;
2645 BufferBlob* AdapterHandlerLibrary::_buffer = nullptr;
2646 volatile uint AdapterHandlerLibrary::_id_counter = 0;
2647
2648 BufferBlob* AdapterHandlerLibrary::buffer_blob() {
2649 assert(_buffer != nullptr, "should be initialized");
2650 return _buffer;
2651 }
2652
2653 static void post_adapter_creation(const AdapterHandlerEntry* entry) {
2654 if (Forte::is_enabled() || JvmtiExport::should_post_dynamic_code_generated()) {
2655 AdapterBlob* adapter_blob = entry->adapter_blob();
2656 char blob_id[256];
2657 jio_snprintf(blob_id,
2658 sizeof(blob_id),
2659 "%s(%s)",
2660 adapter_blob->name(),
2661 entry->fingerprint()->as_string());
2662 if (Forte::is_enabled()) {
2663 Forte::register_stub(blob_id, adapter_blob->content_begin(), adapter_blob->content_end());
2664 }
2672 void AdapterHandlerLibrary::initialize() {
2673 {
2674 ResourceMark rm;
2675 _adapter_handler_table = new (mtCode) AdapterHandlerTable();
2676 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size);
2677 }
2678
2679 #if INCLUDE_CDS
2680 // Link adapters in AOT Cache to their code in AOT Code Cache
2681 if (AOTCodeCache::is_using_adapter() && !_aot_adapter_handler_table.empty()) {
2682 link_aot_adapters();
2683 lookup_simple_adapters();
2684 return;
2685 }
2686 #endif // INCLUDE_CDS
2687
2688 ResourceMark rm;
2689 {
2690 MutexLocker mu(AdapterHandlerLibrary_lock);
2691
2692 CompiledEntrySignature no_args;
2693 no_args.compute_calling_conventions();
2694 _no_arg_handler = create_adapter(no_args, true);
2695
2696 CompiledEntrySignature obj_args;
2697 SigEntry::add_entry(obj_args.sig(), T_OBJECT);
2698 obj_args.compute_calling_conventions();
2699 _obj_arg_handler = create_adapter(obj_args, true);
2700
2701 CompiledEntrySignature int_args;
2702 SigEntry::add_entry(int_args.sig(), T_INT);
2703 int_args.compute_calling_conventions();
2704 _int_arg_handler = create_adapter(int_args, true);
2705
2706 CompiledEntrySignature obj_int_args;
2707 SigEntry::add_entry(obj_int_args.sig(), T_OBJECT);
2708 SigEntry::add_entry(obj_int_args.sig(), T_INT);
2709 obj_int_args.compute_calling_conventions();
2710 _obj_int_arg_handler = create_adapter(obj_int_args, true);
2711
2712 CompiledEntrySignature obj_obj_args;
2713 SigEntry::add_entry(obj_obj_args.sig(), T_OBJECT);
2714 SigEntry::add_entry(obj_obj_args.sig(), T_OBJECT);
2715 obj_obj_args.compute_calling_conventions();
2716 _obj_obj_arg_handler = create_adapter(obj_obj_args, true);
2717
2718 // we should always get an entry back but we don't have any
2719 // associated blob on Zero
2720 assert(_no_arg_handler != nullptr &&
2721 _obj_arg_handler != nullptr &&
2722 _int_arg_handler != nullptr &&
2723 _obj_int_arg_handler != nullptr &&
2724 _obj_obj_arg_handler != nullptr, "Initial adapter handlers must be properly created");
2725 }
2726
2727 // Outside of the lock
2728 #ifndef ZERO
2729 // no blobs to register when we are on Zero
2730 post_adapter_creation(_no_arg_handler);
2731 post_adapter_creation(_obj_arg_handler);
2732 post_adapter_creation(_int_arg_handler);
2733 post_adapter_creation(_obj_int_arg_handler);
2734 post_adapter_creation(_obj_obj_arg_handler);
2735 #endif // ZERO
2736 }
2737
2738 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint) {
2739 uint id = (uint)AtomicAccess::add((int*)&_id_counter, 1);
2740 assert(id > 0, "we can never overflow because AOT cache cannot contain more than 2^32 methods");
2741 return AdapterHandlerEntry::allocate(id, fingerprint);
2742 }
2743
2744 AdapterHandlerEntry* AdapterHandlerLibrary::get_simple_adapter(const methodHandle& method) {
2745 int total_args_passed = method->size_of_parameters(); // All args on stack
2746 if (total_args_passed == 0) {
2747 return _no_arg_handler;
2748 } else if (total_args_passed == 1) {
2749 if (!method->is_static()) {
2750 if (InlineTypePassFieldsAsArgs && method->method_holder()->is_inline_klass()) {
2751 return nullptr;
2752 }
2753 return _obj_arg_handler;
2754 }
2755 switch (method->signature()->char_at(1)) {
2756 case JVM_SIGNATURE_CLASS: {
2757 if (InlineTypePassFieldsAsArgs) {
2758 SignatureStream ss(method->signature());
2759 InlineKlass* vk = ss.as_inline_klass(method->method_holder());
2760 if (vk != nullptr) {
2761 return nullptr;
2762 }
2763 }
2764 return _obj_arg_handler;
2765 }
2766 case JVM_SIGNATURE_ARRAY:
2767 return _obj_arg_handler;
2768 case JVM_SIGNATURE_INT:
2769 case JVM_SIGNATURE_BOOLEAN:
2770 case JVM_SIGNATURE_CHAR:
2771 case JVM_SIGNATURE_BYTE:
2772 case JVM_SIGNATURE_SHORT:
2773 return _int_arg_handler;
2774 }
2775 } else if (total_args_passed == 2 &&
2776 !method->is_static() && (!InlineTypePassFieldsAsArgs || !method->method_holder()->is_inline_klass())) {
2777 switch (method->signature()->char_at(1)) {
2778 case JVM_SIGNATURE_CLASS: {
2779 if (InlineTypePassFieldsAsArgs) {
2780 SignatureStream ss(method->signature());
2781 InlineKlass* vk = ss.as_inline_klass(method->method_holder());
2782 if (vk != nullptr) {
2783 return nullptr;
2784 }
2785 }
2786 return _obj_obj_arg_handler;
2787 }
2788 case JVM_SIGNATURE_ARRAY:
2789 return _obj_obj_arg_handler;
2790 case JVM_SIGNATURE_INT:
2791 case JVM_SIGNATURE_BOOLEAN:
2792 case JVM_SIGNATURE_CHAR:
2793 case JVM_SIGNATURE_BYTE:
2794 case JVM_SIGNATURE_SHORT:
2795 return _obj_int_arg_handler;
2796 }
2797 }
2798 return nullptr;
2799 }
2800
2801 CompiledEntrySignature::CompiledEntrySignature(Method* method) :
2802 _method(method), _num_inline_args(0), _has_inline_recv(false),
2803 _regs(nullptr), _regs_cc(nullptr), _regs_cc_ro(nullptr),
2804 _args_on_stack(0), _args_on_stack_cc(0), _args_on_stack_cc_ro(0),
2805 _c1_needs_stack_repair(false), _c2_needs_stack_repair(false), _supers(nullptr) {
2806 _sig = new GrowableArray<SigEntry>((method != nullptr) ? method->size_of_parameters() : 1);
2807 _sig_cc = new GrowableArray<SigEntry>((method != nullptr) ? method->size_of_parameters() : 1);
2808 _sig_cc_ro = new GrowableArray<SigEntry>((method != nullptr) ? method->size_of_parameters() : 1);
2809 }
2810
2811 // See if we can save space by sharing the same entry for VIEP and VIEP(RO),
2812 // or the same entry for VEP and VIEP(RO).
2813 CodeOffsets::Entries CompiledEntrySignature::c1_inline_ro_entry_type() const {
2814 if (!has_scalarized_args()) {
2815 // VEP/VIEP/VIEP(RO) all share the same entry. There's no packing.
2816 return CodeOffsets::Verified_Entry;
2817 }
2818 if (_method->is_static()) {
2819 // Static methods don't need VIEP(RO)
2820 return CodeOffsets::Verified_Entry;
2821 }
2822
2823 if (has_inline_recv()) {
2824 if (num_inline_args() == 1) {
2825 // Share same entry for VIEP and VIEP(RO).
2826 // This is quite common: we have an instance method in an InlineKlass that has
2827 // no inline type args other than <this>.
2828 return CodeOffsets::Verified_Inline_Entry;
2829 } else {
2830 assert(num_inline_args() > 1, "must be");
2831 // No sharing:
2832 // VIEP(RO) -- <this> is passed as object
2833 // VEP -- <this> is passed as fields
2834 return CodeOffsets::Verified_Inline_Entry_RO;
2835 }
2836 }
2837
2838 // Either a static method, or <this> is not an inline type
2839 if (args_on_stack_cc() != args_on_stack_cc_ro()) {
2840 // No sharing:
2841 // Some arguments are passed on the stack, and we have inserted reserved entries
2842 // into the VEP, but we never insert reserved entries into the VIEP(RO).
2843 return CodeOffsets::Verified_Inline_Entry_RO;
2844 } else {
2845 // Share same entry for VEP and VIEP(RO).
2846 return CodeOffsets::Verified_Entry;
2847 }
2848 }
2849
2850 // Returns all super methods (transitive) in classes and interfaces that are overridden by the current method.
2851 GrowableArray<Method*>* CompiledEntrySignature::get_supers() {
2852 if (_supers != nullptr) {
2853 return _supers;
2854 }
2855 _supers = new GrowableArray<Method*>();
2856 // Skip private, static, and <init> methods
2857 if (_method->is_private() || _method->is_static() || _method->is_object_constructor()) {
2858 return _supers;
2859 }
2860 Symbol* name = _method->name();
2861 Symbol* signature = _method->signature();
2862 const Klass* holder = _method->method_holder()->super();
2863 Symbol* holder_name = holder->name();
2864 ThreadInVMfromUnknown tiv;
2865 JavaThread* current = JavaThread::current();
2866 HandleMark hm(current);
2867 Handle loader(current, _method->method_holder()->class_loader());
2868
2869 // Walk up the class hierarchy and search for super methods
2870 while (holder != nullptr) {
2871 Method* super_method = holder->lookup_method(name, signature);
2872 if (super_method == nullptr) {
2873 break;
2874 }
2875 if (!super_method->is_static() && !super_method->is_private() &&
2876 (!super_method->is_package_private() ||
2877 super_method->method_holder()->is_same_class_package(loader(), holder_name))) {
2878 _supers->push(super_method);
2879 }
2880 holder = super_method->method_holder()->super();
2881 }
2882 // Search interfaces for super methods
2883 Array<InstanceKlass*>* interfaces = _method->method_holder()->transitive_interfaces();
2884 for (int i = 0; i < interfaces->length(); ++i) {
2885 Method* m = interfaces->at(i)->lookup_method(name, signature);
2886 if (m != nullptr && !m->is_static() && m->is_public()) {
2887 _supers->push(m);
2888 }
2889 }
2890 return _supers;
2891 }
2892
2893 // Iterate over arguments and compute scalarized and non-scalarized signatures
2894 void CompiledEntrySignature::compute_calling_conventions(bool init) {
2895 bool has_scalarized = false;
2896 if (_method != nullptr) {
2897 InstanceKlass* holder = _method->method_holder();
2898 int arg_num = 0;
2899 if (!_method->is_static()) {
2900 // We shouldn't scalarize 'this' in a value class constructor
2901 if (holder->is_inline_klass() && InlineKlass::cast(holder)->can_be_passed_as_fields() && !_method->is_object_constructor() &&
2902 (init || _method->is_scalarized_arg(arg_num))) {
2903 _sig_cc->appendAll(InlineKlass::cast(holder)->extended_sig());
2904 has_scalarized = true;
2905 _has_inline_recv = true;
2906 _num_inline_args++;
2907 } else {
2908 SigEntry::add_entry(_sig_cc, T_OBJECT, holder->name());
2909 }
2910 SigEntry::add_entry(_sig, T_OBJECT, holder->name());
2911 SigEntry::add_entry(_sig_cc_ro, T_OBJECT, holder->name());
2912 arg_num++;
2913 }
2914 for (SignatureStream ss(_method->signature()); !ss.at_return_type(); ss.next()) {
2915 BasicType bt = ss.type();
2916 if (bt == T_OBJECT) {
2917 InlineKlass* vk = ss.as_inline_klass(holder);
2918 if (vk != nullptr && vk->can_be_passed_as_fields() && (init || _method->is_scalarized_arg(arg_num))) {
2919 // Check for a calling convention mismatch with super method(s)
2920 bool scalar_super = false;
2921 bool non_scalar_super = false;
2922 GrowableArray<Method*>* supers = get_supers();
2923 for (int i = 0; i < supers->length(); ++i) {
2924 Method* super_method = supers->at(i);
2925 if (super_method->is_scalarized_arg(arg_num)) {
2926 scalar_super = true;
2927 } else {
2928 non_scalar_super = true;
2929 }
2930 }
2931 #ifdef ASSERT
2932 // Randomly enable below code paths for stress testing
2933 bool stress = init && StressCallingConvention;
2934 if (stress && (os::random() & 1) == 1) {
2935 non_scalar_super = true;
2936 if ((os::random() & 1) == 1) {
2937 scalar_super = true;
2938 }
2939 }
2940 #endif
2941 if (non_scalar_super) {
2942 // Found a super method with a non-scalarized argument. Fall back to the non-scalarized calling convention.
2943 if (scalar_super) {
2944 // Found non-scalar *and* scalar super methods. We can't handle both.
2945 // Mark the scalar method as mismatch and re-compile call sites to use non-scalarized calling convention.
2946 for (int i = 0; i < supers->length(); ++i) {
2947 Method* super_method = supers->at(i);
2948 if (super_method->is_scalarized_arg(arg_num) DEBUG_ONLY(|| (stress && (os::random() & 1) == 1))) {
2949 JavaThread* thread = JavaThread::current();
2950 HandleMark hm(thread);
2951 methodHandle mh(thread, super_method);
2952 DeoptimizationScope deopt_scope;
2953 {
2954 // Keep the lock scope minimal. Prevent interference with other
2955 // dependency checks by setting mismatch and marking within the lock.
2956 MutexLocker ml(Compile_lock, Mutex::_safepoint_check_flag);
2957 super_method->set_mismatch();
2958 CodeCache::mark_for_deoptimization(&deopt_scope, mh());
2959 }
2960 deopt_scope.deoptimize_marked();
2961 }
2962 }
2963 }
2964 // Fall back to non-scalarized calling convention
2965 SigEntry::add_entry(_sig_cc, T_OBJECT, ss.as_symbol());
2966 SigEntry::add_entry(_sig_cc_ro, T_OBJECT, ss.as_symbol());
2967 } else {
2968 _num_inline_args++;
2969 has_scalarized = true;
2970 int last = _sig_cc->length();
2971 int last_ro = _sig_cc_ro->length();
2972 _sig_cc->appendAll(vk->extended_sig());
2973 _sig_cc_ro->appendAll(vk->extended_sig());
2974 // Insert InlineTypeNode::NullMarker field right after T_METADATA delimiter
2975 _sig_cc->insert_before(last+1, SigEntry(T_BOOLEAN, -1, nullptr, true));
2976 _sig_cc_ro->insert_before(last_ro+1, SigEntry(T_BOOLEAN, -1, nullptr, true));
2977 }
2978 } else {
2979 SigEntry::add_entry(_sig_cc, T_OBJECT, ss.as_symbol());
2980 SigEntry::add_entry(_sig_cc_ro, T_OBJECT, ss.as_symbol());
2981 }
2982 bt = T_OBJECT;
2983 } else {
2984 SigEntry::add_entry(_sig_cc, ss.type(), ss.as_symbol());
2985 SigEntry::add_entry(_sig_cc_ro, ss.type(), ss.as_symbol());
2986 }
2987 SigEntry::add_entry(_sig, bt, ss.as_symbol());
2988 if (bt != T_VOID) {
2989 arg_num++;
2990 }
2991 }
2992 }
2993
2994 // Compute the non-scalarized calling convention
2995 _regs = NEW_RESOURCE_ARRAY(VMRegPair, _sig->length());
2996 _args_on_stack = SharedRuntime::java_calling_convention(_sig, _regs);
2997
2998 // Compute the scalarized calling conventions if there are scalarized inline types in the signature
2999 if (has_scalarized && !_method->is_native()) {
3000 _regs_cc = NEW_RESOURCE_ARRAY(VMRegPair, _sig_cc->length());
3001 _args_on_stack_cc = SharedRuntime::java_calling_convention(_sig_cc, _regs_cc);
3002
3003 _regs_cc_ro = NEW_RESOURCE_ARRAY(VMRegPair, _sig_cc_ro->length());
3004 _args_on_stack_cc_ro = SharedRuntime::java_calling_convention(_sig_cc_ro, _regs_cc_ro);
3005
3006 _c1_needs_stack_repair = (_args_on_stack_cc < _args_on_stack) || (_args_on_stack_cc_ro < _args_on_stack);
3007 _c2_needs_stack_repair = (_args_on_stack_cc > _args_on_stack) || (_args_on_stack_cc > _args_on_stack_cc_ro);
3008
3009 // Upper bound on stack arguments to avoid hitting the argument limit and
3010 // bailing out of compilation ("unsupported incoming calling sequence").
3011 // TODO we need a reasonable limit (flag?) here
3012 if (MAX2(_args_on_stack_cc, _args_on_stack_cc_ro) <= 60) {
3013 return; // Success
3014 }
3015 }
3016
3017 // No scalarized args
3018 _sig_cc = _sig;
3019 _regs_cc = _regs;
3020 _args_on_stack_cc = _args_on_stack;
3021
3022 _sig_cc_ro = _sig;
3023 _regs_cc_ro = _regs;
3024 _args_on_stack_cc_ro = _args_on_stack;
3025 }
3026
3027 void CompiledEntrySignature::initialize_from_fingerprint(AdapterFingerPrint* fingerprint) {
3028 _has_inline_recv = fingerprint->has_ro_adapter();
3029
3030 int value_object_count = 0;
3031 BasicType prev_bt = T_ILLEGAL;
3032 bool has_scalarized_arguments = false;
3033 bool long_prev = false;
3034 int long_prev_offset = -1;
3035
3036 fingerprint->iterate_args([&] (const AdapterFingerPrint::Element& arg) {
3037 BasicType bt = arg.bt();
3038 int offset = arg.offset();
3039
3040 if (long_prev) {
3041 long_prev = false;
3042 BasicType bt_to_add;
3043 if (bt == T_VOID) {
3044 bt_to_add = T_LONG;
3045 } else {
3046 bt_to_add = T_OBJECT;
3047 }
3048 if (value_object_count == 0) {
3049 SigEntry::add_entry(_sig, bt_to_add);
3050 }
3051 SigEntry::add_entry(_sig_cc, bt_to_add, nullptr, long_prev_offset);
3052 SigEntry::add_entry(_sig_cc_ro, bt_to_add, nullptr, long_prev_offset);
3053 }
3054
3055 switch (bt) {
3056 case T_VOID:
3057 if (prev_bt != T_LONG && prev_bt != T_DOUBLE) {
3058 assert(InlineTypePassFieldsAsArgs, "unexpected end of inline type");
3059 value_object_count--;
3060 SigEntry::add_entry(_sig_cc, T_VOID, nullptr, offset);
3061 SigEntry::add_entry(_sig_cc_ro, T_VOID, nullptr, offset);
3062 assert(value_object_count >= 0, "invalid value object count");
3063 } else {
3064 // Nothing to add for _sig: We already added an addition T_VOID in add_entry() when adding T_LONG or T_DOUBLE.
3065 }
3066 break;
3067 case T_INT:
3068 case T_FLOAT:
3069 case T_DOUBLE:
3070 if (value_object_count == 0) {
3071 SigEntry::add_entry(_sig, bt);
3072 }
3073 SigEntry::add_entry(_sig_cc, bt, nullptr, offset);
3074 SigEntry::add_entry(_sig_cc_ro, bt, nullptr, offset);
3075 break;
3076 case T_LONG:
3077 long_prev = true;
3078 long_prev_offset = offset;
3079 break;
3080 case T_BOOLEAN:
3081 case T_CHAR:
3082 case T_BYTE:
3083 case T_SHORT:
3084 case T_OBJECT:
3085 case T_ARRAY:
3086 assert(value_object_count > 0, "must be value object field");
3087 SigEntry::add_entry(_sig_cc, bt, nullptr, offset);
3088 SigEntry::add_entry(_sig_cc_ro, bt, nullptr, offset);
3089 break;
3090 case T_METADATA:
3091 assert(InlineTypePassFieldsAsArgs, "unexpected start of inline type");
3092 if (value_object_count == 0) {
3093 SigEntry::add_entry(_sig, T_OBJECT);
3094 }
3095 SigEntry::add_entry(_sig_cc, T_METADATA, nullptr, offset);
3096 SigEntry::add_entry(_sig_cc_ro, T_METADATA, nullptr, offset);
3097 value_object_count++;
3098 has_scalarized_arguments = true;
3099 break;
3100 default: {
3101 fatal("Unexpected BasicType: %s", basictype_to_str(bt));
3102 }
3103 }
3104 prev_bt = bt;
3105 });
3106
3107 if (long_prev) {
3108 // If previous bt was T_LONG and we reached the end of the signature, we know that it must be a T_OBJECT.
3109 SigEntry::add_entry(_sig, T_OBJECT);
3110 SigEntry::add_entry(_sig_cc, T_OBJECT);
3111 SigEntry::add_entry(_sig_cc_ro, T_OBJECT);
3112 }
3113 assert(value_object_count == 0, "invalid value object count");
3114
3115 _regs = NEW_RESOURCE_ARRAY(VMRegPair, _sig->length());
3116 _args_on_stack = SharedRuntime::java_calling_convention(_sig, _regs);
3117
3118 // Compute the scalarized calling conventions if there are scalarized inline types in the signature
3119 if (has_scalarized_arguments) {
3120 _regs_cc = NEW_RESOURCE_ARRAY(VMRegPair, _sig_cc->length());
3121 _args_on_stack_cc = SharedRuntime::java_calling_convention(_sig_cc, _regs_cc);
3122
3123 _regs_cc_ro = NEW_RESOURCE_ARRAY(VMRegPair, _sig_cc_ro->length());
3124 _args_on_stack_cc_ro = SharedRuntime::java_calling_convention(_sig_cc_ro, _regs_cc_ro);
3125
3126 _c1_needs_stack_repair = (_args_on_stack_cc < _args_on_stack) || (_args_on_stack_cc_ro < _args_on_stack);
3127 _c2_needs_stack_repair = (_args_on_stack_cc > _args_on_stack) || (_args_on_stack_cc > _args_on_stack_cc_ro);
3128 } else {
3129 // No scalarized args
3130 _sig_cc = _sig;
3131 _regs_cc = _regs;
3132 _args_on_stack_cc = _args_on_stack;
3133
3134 _sig_cc_ro = _sig;
3135 _regs_cc_ro = _regs;
3136 _args_on_stack_cc_ro = _args_on_stack;
3137 }
3138
3139 #ifdef ASSERT
3140 {
3141 AdapterFingerPrint* compare_fp = AdapterFingerPrint::allocate(_sig_cc, _has_inline_recv);
3142 assert(fingerprint->equals(compare_fp), "%s - %s", fingerprint->as_string(), compare_fp->as_string());
3143 AdapterFingerPrint::deallocate(compare_fp);
3144 }
3145 #endif
3146 }
3147
3148 const char* AdapterHandlerEntry::_entry_names[] = {
3149 "i2c", "c2i", "c2i_unverified", "c2i_no_clinit_check"
3150 };
3151
3152 #ifdef ASSERT
3153 void AdapterHandlerLibrary::verify_adapter_sharing(CompiledEntrySignature& ces, AdapterHandlerEntry* cached_entry) {
3154 // we can only check for the same code if there is any
3155 #ifndef ZERO
3156 AdapterHandlerEntry* comparison_entry = create_adapter(ces, false, true);
3157 assert(comparison_entry->adapter_blob() == nullptr, "no blob should be created when creating an adapter for comparison");
3158 assert(comparison_entry->compare_code(cached_entry), "code must match");
3159 // Release the one just created
3160 AdapterHandlerEntry::deallocate(comparison_entry);
3161 # endif // ZERO
3162 }
3163 #endif /* ASSERT*/
3164
3165 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(const methodHandle& method) {
3166 assert(!method->is_abstract(), "abstract methods do not have adapters");
3167 // Use customized signature handler. Need to lock around updates to
3168 // the _adapter_handler_table (it is not safe for concurrent readers
3169 // and a single writer: this could be fixed if it becomes a
3170 // problem).
3171
3172 // Fast-path for trivial adapters
3173 AdapterHandlerEntry* entry = get_simple_adapter(method);
3174 if (entry != nullptr) {
3175 return entry;
3176 }
3177
3178 ResourceMark rm;
3179 bool new_entry = false;
3180
3181 CompiledEntrySignature ces(method());
3182 ces.compute_calling_conventions();
3183 if (ces.has_scalarized_args()) {
3184 if (!method->has_scalarized_args()) {
3185 method->set_has_scalarized_args();
3186 }
3187 if (ces.c1_needs_stack_repair()) {
3188 method->set_c1_needs_stack_repair();
3189 }
3190 if (ces.c2_needs_stack_repair() && !method->c2_needs_stack_repair()) {
3191 method->set_c2_needs_stack_repair();
3192 }
3193 }
3194
3195 {
3196 MutexLocker mu(AdapterHandlerLibrary_lock);
3197
3198 // Lookup method signature's fingerprint
3199 entry = lookup(ces.sig_cc(), ces.has_inline_recv());
3200
3201 if (entry != nullptr) {
3202 #ifndef ZERO
3203 assert(entry->is_linked(), "AdapterHandlerEntry must have been linked");
3204 #endif
3205 #ifdef ASSERT
3206 if (!entry->in_aot_cache() && VerifyAdapterSharing) {
3207 verify_adapter_sharing(ces, entry);
3208 }
3209 #endif
3210 } else {
3211 entry = create_adapter(ces, /* allocate_code_blob */ true);
3212 if (entry != nullptr) {
3213 new_entry = true;
3214 }
3215 }
3216 }
3217
3218 // Outside of the lock
3219 if (new_entry) {
3220 post_adapter_creation(entry);
3221 }
3222 return entry;
3223 }
3224
3225 void AdapterHandlerLibrary::lookup_aot_cache(AdapterHandlerEntry* handler) {
3226 ResourceMark rm;
3227 const char* name = AdapterHandlerLibrary::name(handler);
3228 const uint32_t id = AdapterHandlerLibrary::id(handler);
3229
3230 CodeBlob* blob = AOTCodeCache::load_code_blob(AOTCodeEntry::Adapter, id, name);
3231 if (blob != nullptr) {
3246 }
3247 insts_size = adapter_blob->code_size();
3248 st->print_cr("i2c argument handler for: %s %s (%d bytes generated)",
3249 handler->fingerprint()->as_basic_args_string(),
3250 handler->fingerprint()->as_string(), insts_size);
3251 st->print_cr("c2i argument handler starts at " INTPTR_FORMAT, p2i(handler->get_c2i_entry()));
3252 if (Verbose || PrintStubCode) {
3253 address first_pc = adapter_blob->content_begin();
3254 if (first_pc != nullptr) {
3255 Disassembler::decode(first_pc, first_pc + insts_size, st, &adapter_blob->asm_remarks());
3256 st->cr();
3257 }
3258 }
3259 }
3260 #endif // PRODUCT
3261
3262 void AdapterHandlerLibrary::address_to_offset(address entry_address[AdapterBlob::ENTRY_COUNT],
3263 int entry_offset[AdapterBlob::ENTRY_COUNT]) {
3264 entry_offset[AdapterBlob::I2C] = 0;
3265 entry_offset[AdapterBlob::C2I] = entry_address[AdapterBlob::C2I] - entry_address[AdapterBlob::I2C];
3266 entry_offset[AdapterBlob::C2I_Inline] = entry_address[AdapterBlob::C2I_Inline] - entry_address[AdapterBlob::I2C];
3267 entry_offset[AdapterBlob::C2I_Inline_RO] = entry_address[AdapterBlob::C2I_Inline_RO] - entry_address[AdapterBlob::I2C];
3268 entry_offset[AdapterBlob::C2I_Unverified] = entry_address[AdapterBlob::C2I_Unverified] - entry_address[AdapterBlob::I2C];
3269 entry_offset[AdapterBlob::C2I_Unverified_Inline] = entry_address[AdapterBlob::C2I_Unverified_Inline] - entry_address[AdapterBlob::I2C];
3270 if (entry_address[AdapterBlob::C2I_No_Clinit_Check] == nullptr) {
3271 entry_offset[AdapterBlob::C2I_No_Clinit_Check] = -1;
3272 } else {
3273 entry_offset[AdapterBlob::C2I_No_Clinit_Check] = entry_address[AdapterBlob::C2I_No_Clinit_Check] - entry_address[AdapterBlob::I2C];
3274 }
3275 }
3276
3277 bool AdapterHandlerLibrary::generate_adapter_code(AdapterHandlerEntry* handler,
3278 CompiledEntrySignature& ces,
3279 bool allocate_code_blob,
3280 bool is_transient) {
3281 if (log_is_enabled(Info, perf, class, link)) {
3282 ClassLoader::perf_method_adapters_count()->inc();
3283 }
3284
3285 #ifndef ZERO
3286 AdapterBlob* adapter_blob = nullptr;
3287 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
3288 CodeBuffer buffer(buf);
3289 short buffer_locs[20];
3290 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs,
3291 sizeof(buffer_locs)/sizeof(relocInfo));
3292 MacroAssembler masm(&buffer);
3293 address entry_address[AdapterBlob::ENTRY_COUNT];
3294
3295 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage
3296 SharedRuntime::generate_i2c2i_adapters(&masm,
3297 ces.args_on_stack(),
3298 ces.sig(),
3299 ces.regs(),
3300 ces.sig_cc(),
3301 ces.regs_cc(),
3302 ces.sig_cc_ro(),
3303 ces.regs_cc_ro(),
3304 entry_address,
3305 adapter_blob,
3306 allocate_code_blob);
3307
3308 if (ces.has_scalarized_args()) {
3309 // Save a C heap allocated version of the scalarized signature and store it in the adapter
3310 GrowableArray<SigEntry>* heap_sig = new (mtInternal) GrowableArray<SigEntry>(ces.sig_cc()->length(), mtInternal);
3311 heap_sig->appendAll(ces.sig_cc());
3312 handler->set_sig_cc(heap_sig);
3313 }
3314 // On zero there is no code to save and no need to create a blob and
3315 // or relocate the handler.
3316 int entry_offset[AdapterBlob::ENTRY_COUNT];
3317 address_to_offset(entry_address, entry_offset);
3318 #ifdef ASSERT
3319 if (VerifyAdapterSharing) {
3320 handler->save_code(buf->code_begin(), buffer.insts_size());
3321 if (is_transient) {
3322 return true;
3323 }
3324 }
3325 #endif
3326 if (adapter_blob == nullptr) {
3327 // CodeCache is full, disable compilation
3328 // Ought to log this but compile log is only per compile thread
3329 // and we're some non descript Java thread.
3330 return false;
3331 }
3332 handler->set_adapter_blob(adapter_blob);
3333 if (!is_transient && AOTCodeCache::is_dumping_adapter()) {
3334 // try to save generated code
3335 const char* name = AdapterHandlerLibrary::name(handler);
3336 const uint32_t id = AdapterHandlerLibrary::id(handler);
3337 bool success = AOTCodeCache::store_code_blob(*adapter_blob, AOTCodeEntry::Adapter, id, name);
3338 assert(success || !AOTCodeCache::is_dumping_adapter(), "caching of adapter must be disabled");
3339 }
3340 #endif // ZERO
3341
3342 #ifndef PRODUCT
3343 // debugging support
3344 if (PrintAdapterHandlers || PrintStubCode) {
3345 print_adapter_handler_info(tty, handler);
3346 }
3347 #endif
3348
3349 return true;
3350 }
3351
3352 AdapterHandlerEntry* AdapterHandlerLibrary::create_adapter(CompiledEntrySignature& ces,
3353 bool allocate_code_blob,
3354 bool is_transient) {
3355 AdapterFingerPrint* fp = AdapterFingerPrint::allocate(ces.sig_cc(), ces.has_inline_recv());
3356 #ifdef ASSERT
3357 // Verify that we can successfully restore the compiled entry signature object.
3358 CompiledEntrySignature ces_verify;
3359 ces_verify.initialize_from_fingerprint(fp);
3360 #endif
3361 AdapterHandlerEntry* handler = AdapterHandlerLibrary::new_entry(fp);
3362 if (!generate_adapter_code(handler, ces, allocate_code_blob, is_transient)) {
3363 AdapterHandlerEntry::deallocate(handler);
3364 return nullptr;
3365 }
3366 if (!is_transient) {
3367 assert_lock_strong(AdapterHandlerLibrary_lock);
3368 _adapter_handler_table->put(fp, handler);
3369 }
3370 return handler;
3371 }
3372
3373 #if INCLUDE_CDS
3374 void AdapterHandlerEntry::remove_unshareable_info() {
3375 #ifdef ASSERT
3376 _saved_code = nullptr;
3377 _saved_code_length = 0;
3378 #endif // ASSERT
3379 _adapter_blob = nullptr;
3380 _linked = false;
3381 _sig_cc = nullptr;
3382 }
3383
3384 class CopyAdapterTableToArchive : StackObj {
3385 private:
3386 CompactHashtableWriter* _writer;
3387 ArchiveBuilder* _builder;
3388 public:
3389 CopyAdapterTableToArchive(CompactHashtableWriter* writer) : _writer(writer),
3390 _builder(ArchiveBuilder::current())
3391 {}
3392
3393 bool do_entry(AdapterFingerPrint* fp, AdapterHandlerEntry* entry) {
3394 LogStreamHandle(Trace, aot) lsh;
3395 if (ArchiveBuilder::current()->has_been_archived((address)entry)) {
3396 assert(ArchiveBuilder::current()->has_been_archived((address)fp), "must be");
3397 AdapterFingerPrint* buffered_fp = ArchiveBuilder::current()->get_buffered_addr(fp);
3398 assert(buffered_fp != nullptr,"sanity check");
3399 AdapterHandlerEntry* buffered_entry = ArchiveBuilder::current()->get_buffered_addr(entry);
3400 assert(buffered_entry != nullptr,"sanity check");
3401
3441 }
3442 #endif
3443 }
3444
3445 // This method is used during production run to link archived adapters (stored in AOT Cache)
3446 // to their code in AOT Code Cache
3447 void AdapterHandlerEntry::link() {
3448 ResourceMark rm;
3449 assert(_fingerprint != nullptr, "_fingerprint must not be null");
3450 bool generate_code = false;
3451 // Generate code only if AOTCodeCache is not available, or
3452 // caching adapters is disabled, or we fail to link
3453 // the AdapterHandlerEntry to its code in the AOTCodeCache
3454 if (AOTCodeCache::is_using_adapter()) {
3455 AdapterHandlerLibrary::link_aot_adapter_handler(this);
3456 // If link_aot_adapter_handler() succeeds, _adapter_blob will be non-null
3457 if (_adapter_blob == nullptr) {
3458 log_warning(aot)("Failed to link AdapterHandlerEntry (fp=%s) to its code in the AOT code cache", _fingerprint->as_basic_args_string());
3459 generate_code = true;
3460 }
3461
3462 if (get_sig_cc() == nullptr) {
3463 // Calling conventions have to be regenerated at runtime and are accessed through method adapters,
3464 // which are archived in the AOT code cache. If the adapters are not regenerated, the
3465 // calling conventions should be regenerated here.
3466 CompiledEntrySignature ces;
3467 ces.initialize_from_fingerprint(_fingerprint);
3468 if (ces.has_scalarized_args()) {
3469 // Save a C heap allocated version of the scalarized signature and store it in the adapter
3470 GrowableArray<SigEntry>* heap_sig = new (mtInternal) GrowableArray<SigEntry>(ces.sig_cc()->length(), mtInternal);
3471 heap_sig->appendAll(ces.sig_cc());
3472 set_sig_cc(heap_sig);
3473 }
3474 }
3475 } else {
3476 generate_code = true;
3477 }
3478
3479 if (generate_code) {
3480 CompiledEntrySignature ces;
3481 ces.initialize_from_fingerprint(_fingerprint);
3482 if (!AdapterHandlerLibrary::generate_adapter_code(this, ces, true, false)) {
3483 // Don't throw exceptions during VM initialization because java.lang.* classes
3484 // might not have been initialized, causing problems when constructing the
3485 // Java exception object.
3486 vm_exit_during_initialization("Out of space in CodeCache for adapters");
3487 }
3488 }
3489 if (_adapter_blob != nullptr) {
3490 post_adapter_creation(this);
3491 }
3492 assert(_linked, "AdapterHandlerEntry must now be linked");
3493 }
3494
3495 void AdapterHandlerLibrary::link_aot_adapters() {
3496 uint max_id = 0;
3497 assert(AOTCodeCache::is_using_adapter(), "AOT adapters code should be available");
3498 /* It is possible that some adapters generated in assembly phase are not stored in the cache.
3499 * That implies adapter ids of the adapters in the cache may not be contiguous.
3500 * If the size of the _aot_adapter_handler_table is used to initialize _id_counter, then it may
3501 * result in collision of adapter ids between AOT stored handlers and runtime generated handlers.
3502 * To avoid such situation, initialize the _id_counter with the largest adapter id among the AOT stored handlers.
3503 */
3504 _aot_adapter_handler_table.iterate_all([&](AdapterHandlerEntry* entry) {
3505 assert(!entry->is_linked(), "AdapterHandlerEntry is already linked!");
3506 entry->link();
3507 max_id = MAX2(max_id, entry->id());
3508 });
3509 // Set adapter id to the maximum id found in the AOTCache
3510 assert(_id_counter == 0, "Did not expect new AdapterHandlerEntry to be created at this stage");
3511 _id_counter = max_id;
3512 }
3513
3514 // This method is called during production run to lookup simple adapters
3515 // in the archived adapter handler table
3516 void AdapterHandlerLibrary::lookup_simple_adapters() {
3517 assert(!_aot_adapter_handler_table.empty(), "archived adapter handler table is empty");
3518
3519 MutexLocker mu(AdapterHandlerLibrary_lock);
3520 ResourceMark rm;
3521 CompiledEntrySignature no_args;
3522 no_args.compute_calling_conventions();
3523 _no_arg_handler = lookup(no_args.sig_cc(), no_args.has_inline_recv());
3524
3525 CompiledEntrySignature obj_args;
3526 SigEntry::add_entry(obj_args.sig(), T_OBJECT);
3527 obj_args.compute_calling_conventions();
3528 _obj_arg_handler = lookup(obj_args.sig_cc(), obj_args.has_inline_recv());
3529
3530 CompiledEntrySignature int_args;
3531 SigEntry::add_entry(int_args.sig(), T_INT);
3532 int_args.compute_calling_conventions();
3533 _int_arg_handler = lookup(int_args.sig_cc(), int_args.has_inline_recv());
3534
3535 CompiledEntrySignature obj_int_args;
3536 SigEntry::add_entry(obj_int_args.sig(), T_OBJECT);
3537 SigEntry::add_entry(obj_int_args.sig(), T_INT);
3538 obj_int_args.compute_calling_conventions();
3539 _obj_int_arg_handler = lookup(obj_int_args.sig_cc(), obj_int_args.has_inline_recv());
3540
3541 CompiledEntrySignature obj_obj_args;
3542 SigEntry::add_entry(obj_obj_args.sig(), T_OBJECT);
3543 SigEntry::add_entry(obj_obj_args.sig(), T_OBJECT);
3544 obj_obj_args.compute_calling_conventions();
3545 _obj_obj_arg_handler = lookup(obj_obj_args.sig_cc(), obj_obj_args.has_inline_recv());
3546
3547 assert(_no_arg_handler != nullptr &&
3548 _obj_arg_handler != nullptr &&
3549 _int_arg_handler != nullptr &&
3550 _obj_int_arg_handler != nullptr &&
3551 _obj_obj_arg_handler != nullptr, "Initial adapters not found in archived adapter handler table");
3552 assert(_no_arg_handler->is_linked() &&
3553 _obj_arg_handler->is_linked() &&
3554 _int_arg_handler->is_linked() &&
3555 _obj_int_arg_handler->is_linked() &&
3556 _obj_obj_arg_handler->is_linked(), "Initial adapters not in linked state");
3557 }
3558 #endif // INCLUDE_CDS
3559
3560 void AdapterHandlerEntry::metaspace_pointers_do(MetaspaceClosure* it) {
3561 LogStreamHandle(Trace, aot) lsh;
3562 if (lsh.is_enabled()) {
3563 lsh.print("Iter(AdapterHandlerEntry): %p(%s)", this, _fingerprint->as_basic_args_string());
3564 lsh.cr();
3565 }
3566 it->push(&_fingerprint);
3567 }
3568
3569 AdapterHandlerEntry::~AdapterHandlerEntry() {
3570 if (_fingerprint != nullptr) {
3571 AdapterFingerPrint::deallocate(_fingerprint);
3572 _fingerprint = nullptr;
3573 }
3574 if (_sig_cc != nullptr) {
3575 delete _sig_cc;
3576 }
3577 #ifdef ASSERT
3578 FREE_C_HEAP_ARRAY(unsigned char, _saved_code);
3579 #endif
3580 FreeHeap(this);
3581 }
3582
3583
3584 #ifdef ASSERT
3585 // Capture the code before relocation so that it can be compared
3586 // against other versions. If the code is captured after relocation
3587 // then relative instructions won't be equivalent.
3588 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length) {
3589 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length, mtCode);
3590 _saved_code_length = length;
3591 memcpy(_saved_code, buffer, length);
3592 }
3593
3594
3595 bool AdapterHandlerEntry::compare_code(AdapterHandlerEntry* other) {
3596 assert(_saved_code != nullptr && other->_saved_code != nullptr, "code not saved");
3644
3645 struct { double data[20]; } locs_buf;
3646 struct { double data[20]; } stubs_locs_buf;
3647 buffer.insts()->initialize_shared_locs((relocInfo*)&locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
3648 #if defined(AARCH64) || defined(PPC64)
3649 // On AArch64 with ZGC and nmethod entry barriers, we need all oops to be
3650 // in the constant pool to ensure ordering between the barrier and oops
3651 // accesses. For native_wrappers we need a constant.
3652 // On PPC64 the continuation enter intrinsic needs the constant pool for the compiled
3653 // static java call that is resolved in the runtime.
3654 if (PPC64_ONLY(method->is_continuation_enter_intrinsic() &&) true) {
3655 buffer.initialize_consts_size(8 PPC64_ONLY(+ 24));
3656 }
3657 #endif
3658 buffer.stubs()->initialize_shared_locs((relocInfo*)&stubs_locs_buf, sizeof(stubs_locs_buf) / sizeof(relocInfo));
3659 MacroAssembler _masm(&buffer);
3660
3661 // Fill in the signature array, for the calling-convention call.
3662 const int total_args_passed = method->size_of_parameters();
3663
3664 BasicType stack_sig_bt[16];
3665 VMRegPair stack_regs[16];
3666 BasicType* sig_bt = (total_args_passed <= 16) ? stack_sig_bt : NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
3667 VMRegPair* regs = (total_args_passed <= 16) ? stack_regs : NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
3668
3669 int i = 0;
3670 if (!method->is_static()) { // Pass in receiver first
3671 sig_bt[i++] = T_OBJECT;
3672 }
3673 SignatureStream ss(method->signature());
3674 for (; !ss.at_return_type(); ss.next()) {
3675 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
3676 if (ss.type() == T_LONG || ss.type() == T_DOUBLE) {
3677 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
3678 }
3679 }
3680 assert(i == total_args_passed, "");
3681 BasicType ret_type = ss.type();
3682
3683 // Now get the compiled-Java arguments layout.
3684 SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed);
3685
3686 // Generate the compiled-to-native wrapper code
3687 nm = SharedRuntime::generate_native_wrapper(&_masm, method, compile_id, sig_bt, regs, ret_type);
3688
3689 if (nm != nullptr) {
3690 {
3691 MutexLocker pl(NMethodState_lock, Mutex::_no_safepoint_check_flag);
3692 if (nm->make_in_use()) {
3693 method->set_code(method, nm);
3694 }
3695 }
3696
3697 DirectiveSet* directive = DirectivesStack::getMatchingDirective(method, CompileBroker::compiler(CompLevel_simple));
3698 if (directive->PrintAssemblyOption) {
3699 nm->print_code();
3700 }
3701 DirectivesStack::release(directive);
3909 if (b == handler->adapter_blob()) {
3910 found = true;
3911 st->print("Adapter for signature: ");
3912 handler->print_adapter_on(st);
3913 return false; // abort iteration
3914 } else {
3915 return true; // keep looking
3916 }
3917 };
3918 assert_locked_or_safepoint(AdapterHandlerLibrary_lock);
3919 _adapter_handler_table->iterate(findblob_runtime_table);
3920 }
3921 assert(found, "Should have found handler");
3922 }
3923
3924 void AdapterHandlerEntry::print_adapter_on(outputStream* st) const {
3925 st->print("AHE@" INTPTR_FORMAT ": %s", p2i(this), fingerprint()->as_string());
3926 if (adapter_blob() != nullptr) {
3927 st->print(" i2c: " INTPTR_FORMAT, p2i(get_i2c_entry()));
3928 st->print(" c2i: " INTPTR_FORMAT, p2i(get_c2i_entry()));
3929 st->print(" c2iVE: " INTPTR_FORMAT, p2i(get_c2i_inline_entry()));
3930 st->print(" c2iVROE: " INTPTR_FORMAT, p2i(get_c2i_inline_ro_entry()));
3931 st->print(" c2iUE: " INTPTR_FORMAT, p2i(get_c2i_unverified_entry()));
3932 st->print(" c2iUVE: " INTPTR_FORMAT, p2i(get_c2i_unverified_inline_entry()));
3933 if (get_c2i_no_clinit_check_entry() != nullptr) {
3934 st->print(" c2iNCI: " INTPTR_FORMAT, p2i(get_c2i_no_clinit_check_entry()));
3935 }
3936 }
3937 st->cr();
3938 }
3939
3940 #ifndef PRODUCT
3941
3942 void AdapterHandlerLibrary::print_statistics() {
3943 print_table_statistics();
3944 }
3945
3946 #endif /* PRODUCT */
3947
3948 JRT_LEAF(void, SharedRuntime::enable_stack_reserved_zone(JavaThread* current))
3949 assert(current == JavaThread::current(), "pre-condition");
3950 StackOverflow* overflow_state = current->stack_overflow_state();
3951 overflow_state->enable_stack_reserved_zone(/*check_if_disabled*/true);
3952 overflow_state->set_reserved_stack_activation(current->stack_base());
3999 event.set_method(method);
4000 event.commit();
4001 }
4002 }
4003 }
4004 return activation;
4005 }
4006
4007 void SharedRuntime::on_slowpath_allocation_exit(JavaThread* current) {
4008 // After any safepoint, just before going back to compiled code,
4009 // we inform the GC that we will be doing initializing writes to
4010 // this object in the future without emitting card-marks, so
4011 // GC may take any compensating steps.
4012
4013 oop new_obj = current->vm_result_oop();
4014 if (new_obj == nullptr) return;
4015
4016 BarrierSet *bs = BarrierSet::barrier_set();
4017 bs->on_slowpath_allocation_exit(current, new_obj);
4018 }
4019
4020 // We are at a compiled code to interpreter call. We need backing
4021 // buffers for all inline type arguments. Allocate an object array to
4022 // hold them (convenient because once we're done with it we don't have
4023 // to worry about freeing it).
4024 oop SharedRuntime::allocate_inline_types_impl(JavaThread* current, methodHandle callee, bool allocate_receiver, TRAPS) {
4025 assert(InlineTypePassFieldsAsArgs, "no reason to call this");
4026 ResourceMark rm;
4027
4028 int nb_slots = 0;
4029 InstanceKlass* holder = callee->method_holder();
4030 allocate_receiver &= !callee->is_static() && holder->is_inline_klass() && callee->is_scalarized_arg(0);
4031 if (allocate_receiver) {
4032 nb_slots++;
4033 }
4034 int arg_num = callee->is_static() ? 0 : 1;
4035 for (SignatureStream ss(callee->signature()); !ss.at_return_type(); ss.next()) {
4036 BasicType bt = ss.type();
4037 if (bt == T_OBJECT && callee->is_scalarized_arg(arg_num)) {
4038 nb_slots++;
4039 }
4040 if (bt != T_VOID) {
4041 arg_num++;
4042 }
4043 }
4044 objArrayOop array_oop = oopFactory::new_objectArray(nb_slots, CHECK_NULL);
4045 objArrayHandle array(THREAD, array_oop);
4046 arg_num = callee->is_static() ? 0 : 1;
4047 int i = 0;
4048 if (allocate_receiver) {
4049 InlineKlass* vk = InlineKlass::cast(holder);
4050 oop res = vk->allocate_instance(CHECK_NULL);
4051 array->obj_at_put(i++, res);
4052 }
4053 for (SignatureStream ss(callee->signature()); !ss.at_return_type(); ss.next()) {
4054 BasicType bt = ss.type();
4055 if (bt == T_OBJECT && callee->is_scalarized_arg(arg_num)) {
4056 InlineKlass* vk = ss.as_inline_klass(holder);
4057 assert(vk != nullptr, "Unexpected klass");
4058 oop res = vk->allocate_instance(CHECK_NULL);
4059 array->obj_at_put(i++, res);
4060 }
4061 if (bt != T_VOID) {
4062 arg_num++;
4063 }
4064 }
4065 return array();
4066 }
4067
4068 JRT_ENTRY(void, SharedRuntime::allocate_inline_types(JavaThread* current, Method* callee_method, bool allocate_receiver))
4069 methodHandle callee(current, callee_method);
4070 oop array = SharedRuntime::allocate_inline_types_impl(current, callee, allocate_receiver, CHECK);
4071 current->set_vm_result_oop(array);
4072 current->set_vm_result_metadata(callee()); // TODO: required to keep callee live?
4073 JRT_END
4074
4075 // We're returning from an interpreted method: load each field into a
4076 // register following the calling convention
4077 JRT_LEAF(void, SharedRuntime::load_inline_type_fields_in_regs(JavaThread* current, oopDesc* res))
4078 {
4079 assert(res->klass()->is_inline_klass(), "only inline types here");
4080 ResourceMark rm;
4081 RegisterMap reg_map(current,
4082 RegisterMap::UpdateMap::include,
4083 RegisterMap::ProcessFrames::include,
4084 RegisterMap::WalkContinuation::skip);
4085 frame stubFrame = current->last_frame();
4086 frame callerFrame = stubFrame.sender(®_map);
4087 assert(callerFrame.is_interpreted_frame(), "should be coming from interpreter");
4088
4089 InlineKlass* vk = InlineKlass::cast(res->klass());
4090
4091 const Array<SigEntry>* sig_vk = vk->extended_sig();
4092 const Array<VMRegPair>* regs = vk->return_regs();
4093
4094 if (regs == nullptr) {
4095 // The fields of the inline klass don't fit in registers, bail out
4096 return;
4097 }
4098
4099 int j = 1;
4100 for (int i = 0; i < sig_vk->length(); i++) {
4101 BasicType bt = sig_vk->at(i)._bt;
4102 if (bt == T_METADATA) {
4103 continue;
4104 }
4105 if (bt == T_VOID) {
4106 if (sig_vk->at(i-1)._bt == T_LONG ||
4107 sig_vk->at(i-1)._bt == T_DOUBLE) {
4108 j++;
4109 }
4110 continue;
4111 }
4112 int off = sig_vk->at(i)._offset;
4113 assert(off > 0, "offset in object should be positive");
4114 VMRegPair pair = regs->at(j);
4115 address loc = reg_map.location(pair.first(), nullptr);
4116 guarantee(loc != nullptr, "bad register save location");
4117 switch(bt) {
4118 case T_BOOLEAN:
4119 *(jboolean*)loc = res->bool_field(off);
4120 break;
4121 case T_CHAR:
4122 *(jchar*)loc = res->char_field(off);
4123 break;
4124 case T_BYTE:
4125 *(jbyte*)loc = res->byte_field(off);
4126 break;
4127 case T_SHORT:
4128 *(jshort*)loc = res->short_field(off);
4129 break;
4130 case T_INT: {
4131 *(jint*)loc = res->int_field(off);
4132 break;
4133 }
4134 case T_LONG:
4135 #ifdef _LP64
4136 *(intptr_t*)loc = res->long_field(off);
4137 #else
4138 Unimplemented();
4139 #endif
4140 break;
4141 case T_OBJECT:
4142 case T_ARRAY: {
4143 *(oop*)loc = res->obj_field(off);
4144 break;
4145 }
4146 case T_FLOAT:
4147 *(jfloat*)loc = res->float_field(off);
4148 break;
4149 case T_DOUBLE:
4150 *(jdouble*)loc = res->double_field(off);
4151 break;
4152 default:
4153 ShouldNotReachHere();
4154 }
4155 j++;
4156 }
4157 assert(j == regs->length(), "missed a field?");
4158
4159 #ifdef ASSERT
4160 VMRegPair pair = regs->at(0);
4161 address loc = reg_map.location(pair.first(), nullptr);
4162 assert(*(oopDesc**)loc == res, "overwritten object");
4163 #endif
4164
4165 current->set_vm_result_oop(res);
4166 }
4167 JRT_END
4168
4169 // We've returned to an interpreted method, the interpreter needs a
4170 // reference to an inline type instance. Allocate it and initialize it
4171 // from field's values in registers.
4172 JRT_BLOCK_ENTRY(void, SharedRuntime::store_inline_type_fields_to_buf(JavaThread* current, intptr_t res))
4173 {
4174 ResourceMark rm;
4175 RegisterMap reg_map(current,
4176 RegisterMap::UpdateMap::include,
4177 RegisterMap::ProcessFrames::include,
4178 RegisterMap::WalkContinuation::skip);
4179 frame stubFrame = current->last_frame();
4180 frame callerFrame = stubFrame.sender(®_map);
4181
4182 #ifdef ASSERT
4183 InlineKlass* verif_vk = InlineKlass::returned_inline_klass(reg_map);
4184 #endif
4185
4186 if (!is_set_nth_bit(res, 0)) {
4187 // We're not returning with inline type fields in registers (the
4188 // calling convention didn't allow it for this inline klass)
4189 assert(!Metaspace::contains((void*)res), "should be oop or pointer in buffer area");
4190 current->set_vm_result_oop((oopDesc*)res);
4191 assert(verif_vk == nullptr, "broken calling convention");
4192 return;
4193 }
4194
4195 clear_nth_bit(res, 0);
4196 InlineKlass* vk = (InlineKlass*)res;
4197 assert(verif_vk == vk, "broken calling convention");
4198 assert(Metaspace::contains((void*)res), "should be klass");
4199
4200 // Allocate handles for every oop field so they are safe in case of
4201 // a safepoint when allocating
4202 GrowableArray<Handle> handles;
4203 vk->save_oop_fields(reg_map, handles);
4204
4205 // It's unsafe to safepoint until we are here
4206 JRT_BLOCK;
4207 {
4208 JavaThread* THREAD = current;
4209 oop vt = vk->realloc_result(reg_map, handles, CHECK);
4210 current->set_vm_result_oop(vt);
4211 }
4212 JRT_BLOCK_END;
4213 }
4214 JRT_END
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