27 #include "jvm.h"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/vmClasses.hpp"
30 #include "classfile/vmSymbols.hpp"
31 #include "code/codeCache.hpp"
32 #include "code/compiledIC.hpp"
33 #include "code/icBuffer.hpp"
34 #include "code/compiledMethod.inline.hpp"
35 #include "code/scopeDesc.hpp"
36 #include "code/vtableStubs.hpp"
37 #include "compiler/abstractCompiler.hpp"
38 #include "compiler/compileBroker.hpp"
39 #include "compiler/disassembler.hpp"
40 #include "gc/shared/barrierSet.hpp"
41 #include "gc/shared/collectedHeap.hpp"
42 #include "gc/shared/gcLocker.inline.hpp"
43 #include "interpreter/interpreter.hpp"
44 #include "interpreter/interpreterRuntime.hpp"
45 #include "jfr/jfrEvents.hpp"
46 #include "logging/log.hpp"
47 #include "memory/resourceArea.hpp"
48 #include "memory/universe.hpp"
49 #include "oops/compiledICHolder.inline.hpp"
50 #include "oops/klass.hpp"
51 #include "oops/method.inline.hpp"
52 #include "oops/objArrayKlass.hpp"
53 #include "oops/oop.inline.hpp"
54 #include "prims/forte.hpp"
55 #include "prims/jvmtiExport.hpp"
56 #include "prims/methodHandles.hpp"
57 #include "prims/nativeLookup.hpp"
58 #include "runtime/atomic.hpp"
59 #include "runtime/frame.inline.hpp"
60 #include "runtime/handles.inline.hpp"
61 #include "runtime/init.hpp"
62 #include "runtime/interfaceSupport.inline.hpp"
63 #include "runtime/java.hpp"
64 #include "runtime/javaCalls.hpp"
65 #include "runtime/sharedRuntime.hpp"
66 #include "runtime/stackWatermarkSet.hpp"
67 #include "runtime/stubRoutines.hpp"
68 #include "runtime/synchronizer.hpp"
69 #include "runtime/vframe.inline.hpp"
70 #include "runtime/vframeArray.hpp"
71 #include "runtime/vm_version.hpp"
72 #include "utilities/copy.hpp"
73 #include "utilities/dtrace.hpp"
74 #include "utilities/events.hpp"
75 #include "utilities/hashtable.inline.hpp"
76 #include "utilities/macros.hpp"
77 #include "utilities/xmlstream.hpp"
78 #ifdef COMPILER1
79 #include "c1/c1_Runtime1.hpp"
80 #endif
81
82 // Shared stub locations
83 RuntimeStub* SharedRuntime::_wrong_method_blob;
84 RuntimeStub* SharedRuntime::_wrong_method_abstract_blob;
85 RuntimeStub* SharedRuntime::_ic_miss_blob;
86 RuntimeStub* SharedRuntime::_resolve_opt_virtual_call_blob;
87 RuntimeStub* SharedRuntime::_resolve_virtual_call_blob;
88 RuntimeStub* SharedRuntime::_resolve_static_call_blob;
89 address SharedRuntime::_resolve_static_call_entry;
90
91 DeoptimizationBlob* SharedRuntime::_deopt_blob;
92 SafepointBlob* SharedRuntime::_polling_page_vectors_safepoint_handler_blob;
93 SafepointBlob* SharedRuntime::_polling_page_safepoint_handler_blob;
94 SafepointBlob* SharedRuntime::_polling_page_return_handler_blob;
95
96 #ifdef COMPILER2
97 UncommonTrapBlob* SharedRuntime::_uncommon_trap_blob;
98 #endif // COMPILER2
99
100
101 //----------------------------generate_stubs-----------------------------------
102 void SharedRuntime::generate_stubs() {
103 _wrong_method_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method), "wrong_method_stub");
104 _wrong_method_abstract_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_abstract), "wrong_method_abstract_stub");
105 _ic_miss_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_ic_miss), "ic_miss_stub");
106 _resolve_opt_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_opt_virtual_call_C), "resolve_opt_virtual_call");
107 _resolve_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_virtual_call_C), "resolve_virtual_call");
108 _resolve_static_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_static_call_C), "resolve_static_call");
109 _resolve_static_call_entry = _resolve_static_call_blob->entry_point();
110
111 AdapterHandlerLibrary::initialize();
112
113 #if COMPILER2_OR_JVMCI
114 // Vectors are generated only by C2 and JVMCI.
115 bool support_wide = is_wide_vector(MaxVectorSize);
116 if (support_wide) {
117 _polling_page_vectors_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_VECTOR_LOOP);
118 }
119 #endif // COMPILER2_OR_JVMCI
120 _polling_page_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_LOOP);
121 _polling_page_return_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_RETURN);
122
123 generate_deopt_blob();
124
125 #ifdef COMPILER2
126 generate_uncommon_trap_blob();
127 #endif // COMPILER2
128 }
129
969 // forwarded before we look at the return value.
970 THROW_(vmSymbols::java_lang_UnsatisfiedLinkError(), (void*)badAddress);
971 }
972 JNI_END
973
974 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() {
975 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error);
976 }
977
978 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* current, oopDesc* obj))
979 #if INCLUDE_JVMCI
980 if (!obj->klass()->has_finalizer()) {
981 return;
982 }
983 #endif // INCLUDE_JVMCI
984 assert(oopDesc::is_oop(obj), "must be a valid oop");
985 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
986 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
987 JRT_END
988
989 jlong SharedRuntime::get_java_tid(Thread* thread) {
990 if (thread != NULL) {
991 if (thread->is_Java_thread()) {
992 oop obj = JavaThread::cast(thread)->threadObj();
993 return (obj == NULL) ? 0 : java_lang_Thread::thread_id(obj);
994 }
995 }
996 return 0;
997 }
998
999 /**
1000 * This function ought to be a void function, but cannot be because
1001 * it gets turned into a tail-call on sparc, which runs into dtrace bug
1002 * 6254741. Once that is fixed we can remove the dummy return value.
1003 */
1004 int SharedRuntime::dtrace_object_alloc(oopDesc* o) {
1005 return dtrace_object_alloc(Thread::current(), o, o->size());
1006 }
1007
1008 int SharedRuntime::dtrace_object_alloc(Thread* thread, oopDesc* o) {
1073 return caller->attached_method_before_pc(pc);
1074 }
1075 return NULL;
1076 }
1077
1078 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode
1079 // for a call current in progress, i.e., arguments has been pushed on stack
1080 // but callee has not been invoked yet. Caller frame must be compiled.
1081 Handle SharedRuntime::find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc,
1082 CallInfo& callinfo, TRAPS) {
1083 Handle receiver;
1084 Handle nullHandle; // create a handy null handle for exception returns
1085 JavaThread* current = THREAD;
1086
1087 assert(!vfst.at_end(), "Java frame must exist");
1088
1089 // Find caller and bci from vframe
1090 methodHandle caller(current, vfst.method());
1091 int bci = vfst.bci();
1092
1093 Bytecode_invoke bytecode(caller, bci);
1094 int bytecode_index = bytecode.index();
1095 bc = bytecode.invoke_code();
1096
1097 methodHandle attached_method(current, extract_attached_method(vfst));
1098 if (attached_method.not_null()) {
1099 Method* callee = bytecode.static_target(CHECK_NH);
1100 vmIntrinsics::ID id = callee->intrinsic_id();
1101 // When VM replaces MH.invokeBasic/linkTo* call with a direct/virtual call,
1102 // it attaches statically resolved method to the call site.
1103 if (MethodHandles::is_signature_polymorphic(id) &&
1104 MethodHandles::is_signature_polymorphic_intrinsic(id)) {
1105 bc = MethodHandles::signature_polymorphic_intrinsic_bytecode(id);
1106
1107 // Adjust invocation mode according to the attached method.
1108 switch (bc) {
1109 case Bytecodes::_invokevirtual:
1110 if (attached_method->method_holder()->is_interface()) {
1111 bc = Bytecodes::_invokeinterface;
1112 }
1113 break;
1114 case Bytecodes::_invokeinterface:
1115 if (!attached_method->method_holder()->is_interface()) {
1116 bc = Bytecodes::_invokevirtual;
1117 }
1118 break;
1119 case Bytecodes::_invokehandle:
1120 if (!MethodHandles::is_signature_polymorphic_method(attached_method())) {
1121 bc = attached_method->is_static() ? Bytecodes::_invokestatic
1122 : Bytecodes::_invokevirtual;
1123 }
1124 break;
1125 default:
1126 break;
1127 }
1128 }
1129 }
1130
1131 assert(bc != Bytecodes::_illegal, "not initialized");
1132
1133 bool has_receiver = bc != Bytecodes::_invokestatic &&
1134 bc != Bytecodes::_invokedynamic &&
1135 bc != Bytecodes::_invokehandle;
1136
1137 // Find receiver for non-static call
1138 if (has_receiver) {
1139 // This register map must be update since we need to find the receiver for
1140 // compiled frames. The receiver might be in a register.
1141 RegisterMap reg_map2(current);
1142 frame stubFrame = current->last_frame();
1143 // Caller-frame is a compiled frame
1144 frame callerFrame = stubFrame.sender(®_map2);
1145
1146 if (attached_method.is_null()) {
1147 Method* callee = bytecode.static_target(CHECK_NH);
1148 if (callee == NULL) {
1149 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle);
1150 }
1151 }
1152
1153 // Retrieve from a compiled argument list
1154 receiver = Handle(current, callerFrame.retrieve_receiver(®_map2));
1155
1156 if (receiver.is_null()) {
1157 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle);
1158 }
1159 }
1160
1161 // Resolve method
1162 if (attached_method.not_null()) {
1163 // Parameterized by attached method.
1164 LinkResolver::resolve_invoke(callinfo, receiver, attached_method, bc, CHECK_NH);
1165 } else {
1166 // Parameterized by bytecode.
1167 constantPoolHandle constants(current, caller->constants());
1168 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_NH);
1169 }
1170
1171 #ifdef ASSERT
1172 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls
1173 if (has_receiver) {
1174 assert(receiver.not_null(), "should have thrown exception");
1175 Klass* receiver_klass = receiver->klass();
1176 Klass* rk = NULL;
1177 if (attached_method.not_null()) {
1178 // In case there's resolved method attached, use its holder during the check.
1179 rk = attached_method->method_holder();
1180 } else {
1181 // Klass is already loaded.
1182 constantPoolHandle constants(current, caller->constants());
1183 rk = constants->klass_ref_at(bytecode_index, CHECK_NH);
1184 }
1185 Klass* static_receiver_klass = rk;
1186 assert(receiver_klass->is_subtype_of(static_receiver_klass),
1187 "actual receiver must be subclass of static receiver klass");
1188 if (receiver_klass->is_instance_klass()) {
1189 if (InstanceKlass::cast(receiver_klass)->is_not_initialized()) {
1190 tty->print_cr("ERROR: Klass not yet initialized!!");
1191 receiver_klass->print();
1192 }
1193 assert(!InstanceKlass::cast(receiver_klass)->is_not_initialized(), "receiver_klass must be initialized");
1211 // Hence the stack can only contain an entry_frame. We need to
1212 // find the target method from the stub frame.
1213 RegisterMap reg_map(current, false);
1214 frame fr = current->last_frame();
1215 assert(fr.is_runtime_frame(), "must be a runtimeStub");
1216 fr = fr.sender(®_map);
1217 assert(fr.is_entry_frame(), "must be");
1218 // fr is now pointing to the entry frame.
1219 callee_method = methodHandle(current, fr.entry_frame_call_wrapper()->callee_method());
1220 } else {
1221 Bytecodes::Code bc;
1222 CallInfo callinfo;
1223 find_callee_info_helper(vfst, bc, callinfo, CHECK_(methodHandle()));
1224 callee_method = methodHandle(current, callinfo.selected_method());
1225 }
1226 assert(callee_method()->is_method(), "must be");
1227 return callee_method;
1228 }
1229
1230 // Resolves a call.
1231 methodHandle SharedRuntime::resolve_helper(bool is_virtual, bool is_optimized, TRAPS) {
1232 methodHandle callee_method;
1233 callee_method = resolve_sub_helper(is_virtual, is_optimized, THREAD);
1234 if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
1235 int retry_count = 0;
1236 while (!HAS_PENDING_EXCEPTION && callee_method->is_old() &&
1237 callee_method->method_holder() != vmClasses::Object_klass()) {
1238 // If has a pending exception then there is no need to re-try to
1239 // resolve this method.
1240 // If the method has been redefined, we need to try again.
1241 // Hack: we have no way to update the vtables of arrays, so don't
1242 // require that java.lang.Object has been updated.
1243
1244 // It is very unlikely that method is redefined more than 100 times
1245 // in the middle of resolve. If it is looping here more than 100 times
1246 // means then there could be a bug here.
1247 guarantee((retry_count++ < 100),
1248 "Could not resolve to latest version of redefined method");
1249 // method is redefined in the middle of resolve so re-try.
1250 callee_method = resolve_sub_helper(is_virtual, is_optimized, THREAD);
1251 }
1252 }
1253 return callee_method;
1254 }
1255
1256 // This fails if resolution required refilling of IC stubs
1257 bool SharedRuntime::resolve_sub_helper_internal(methodHandle callee_method, const frame& caller_frame,
1258 CompiledMethod* caller_nm, bool is_virtual, bool is_optimized,
1259 Handle receiver, CallInfo& call_info, Bytecodes::Code invoke_code, TRAPS) {
1260 StaticCallInfo static_call_info;
1261 CompiledICInfo virtual_call_info;
1262
1263 // Make sure the callee nmethod does not get deoptimized and removed before
1264 // we are done patching the code.
1265 CompiledMethod* callee = callee_method->code();
1266
1267 if (callee != NULL) {
1268 assert(callee->is_compiled(), "must be nmethod for patching");
1269 }
1270
1271 if (callee != NULL && !callee->is_in_use()) {
1272 // Patch call site to C2I adapter if callee nmethod is deoptimized or unloaded.
1273 callee = NULL;
1274 }
1275 nmethodLocker nl_callee(callee);
1276 #ifdef ASSERT
1277 address dest_entry_point = callee == NULL ? 0 : callee->entry_point(); // used below
1278 #endif
1279
1280 bool is_nmethod = caller_nm->is_nmethod();
1281
1282 if (is_virtual) {
1283 assert(receiver.not_null() || invoke_code == Bytecodes::_invokehandle, "sanity check");
1284 bool static_bound = call_info.resolved_method()->can_be_statically_bound();
1285 Klass* klass = invoke_code == Bytecodes::_invokehandle ? NULL : receiver->klass();
1286 CompiledIC::compute_monomorphic_entry(callee_method, klass,
1287 is_optimized, static_bound, is_nmethod, virtual_call_info,
1288 CHECK_false);
1289 } else {
1290 // static call
1291 CompiledStaticCall::compute_entry(callee_method, is_nmethod, static_call_info);
1292 }
1293
1294 // grab lock, check for deoptimization and potentially patch caller
1295 {
1296 CompiledICLocker ml(caller_nm);
1297
1298 // Lock blocks for safepoint during which both nmethods can change state.
1299
1300 // Now that we are ready to patch if the Method* was redefined then
1301 // don't update call site and let the caller retry.
1302 // Don't update call site if callee nmethod was unloaded or deoptimized.
1303 // Don't update call site if callee nmethod was replaced by an other nmethod
1304 // which may happen when multiply alive nmethod (tiered compilation)
1305 // will be supported.
1306 if (!callee_method->is_old() &&
1307 (callee == NULL || (callee->is_in_use() && callee_method->code() == callee))) {
1308 NoSafepointVerifier nsv;
1309 #ifdef ASSERT
1310 // We must not try to patch to jump to an already unloaded method.
1311 if (dest_entry_point != 0) {
1321 return false;
1322 }
1323 }
1324 } else {
1325 if (VM_Version::supports_fast_class_init_checks() &&
1326 invoke_code == Bytecodes::_invokestatic &&
1327 callee_method->needs_clinit_barrier() &&
1328 callee != NULL && callee->is_compiled_by_jvmci()) {
1329 return true; // skip patching for JVMCI
1330 }
1331 CompiledStaticCall* ssc = caller_nm->compiledStaticCall_before(caller_frame.pc());
1332 if (ssc->is_clean()) ssc->set(static_call_info);
1333 }
1334 }
1335 } // unlock CompiledICLocker
1336 return true;
1337 }
1338
1339 // Resolves a call. The compilers generate code for calls that go here
1340 // and are patched with the real destination of the call.
1341 methodHandle SharedRuntime::resolve_sub_helper(bool is_virtual, bool is_optimized, TRAPS) {
1342 JavaThread* current = THREAD;
1343 ResourceMark rm(current);
1344 RegisterMap cbl_map(current, false);
1345 frame caller_frame = current->last_frame().sender(&cbl_map);
1346
1347 CodeBlob* caller_cb = caller_frame.cb();
1348 guarantee(caller_cb != NULL && caller_cb->is_compiled(), "must be called from compiled method");
1349 CompiledMethod* caller_nm = caller_cb->as_compiled_method_or_null();
1350
1351 // make sure caller is not getting deoptimized
1352 // and removed before we are done with it.
1353 // CLEANUP - with lazy deopt shouldn't need this lock
1354 nmethodLocker caller_lock(caller_nm);
1355
1356 // determine call info & receiver
1357 // note: a) receiver is NULL for static calls
1358 // b) an exception is thrown if receiver is NULL for non-static calls
1359 CallInfo call_info;
1360 Bytecodes::Code invoke_code = Bytecodes::_illegal;
1361 Handle receiver = find_callee_info(invoke_code, call_info, CHECK_(methodHandle()));
1362 methodHandle callee_method(current, call_info.selected_method());
1363
1364 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic ) ||
1365 (!is_virtual && invoke_code == Bytecodes::_invokespecial) ||
1366 (!is_virtual && invoke_code == Bytecodes::_invokehandle ) ||
1367 (!is_virtual && invoke_code == Bytecodes::_invokedynamic) ||
1368 ( is_virtual && invoke_code != Bytecodes::_invokestatic ), "inconsistent bytecode");
1369
1426 bool successful = resolve_sub_helper_internal(callee_method, caller_frame, caller_nm,
1427 is_virtual, is_optimized, receiver,
1428 call_info, invoke_code, CHECK_(methodHandle()));
1429 if (successful) {
1430 return callee_method;
1431 } else {
1432 InlineCacheBuffer::refill_ic_stubs();
1433 }
1434 }
1435
1436 }
1437
1438
1439 // Inline caches exist only in compiled code
1440 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* current))
1441 #ifdef ASSERT
1442 RegisterMap reg_map(current, false);
1443 frame stub_frame = current->last_frame();
1444 assert(stub_frame.is_runtime_frame(), "sanity check");
1445 frame caller_frame = stub_frame.sender(®_map);
1446 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame() && !caller_frame.is_optimized_entry_frame(), "unexpected frame");
1447 #endif /* ASSERT */
1448
1449 methodHandle callee_method;
1450 JRT_BLOCK
1451 callee_method = SharedRuntime::handle_ic_miss_helper(CHECK_NULL);
1452 // Return Method* through TLS
1453 current->set_vm_result_2(callee_method());
1454 JRT_BLOCK_END
1455 // return compiled code entry point after potential safepoints
1456 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1457 return callee_method->verified_code_entry();
1458 JRT_END
1459
1460
1461 // Handle call site that has been made non-entrant
1462 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* current))
1463 // 6243940 We might end up in here if the callee is deoptimized
1464 // as we race to call it. We don't want to take a safepoint if
1465 // the caller was interpreted because the caller frame will look
1466 // interpreted to the stack walkers and arguments are now
1467 // "compiled" so it is much better to make this transition
1468 // invisible to the stack walking code. The i2c path will
1469 // place the callee method in the callee_target. It is stashed
1470 // there because if we try and find the callee by normal means a
1471 // safepoint is possible and have trouble gc'ing the compiled args.
1472 RegisterMap reg_map(current, false);
1473 frame stub_frame = current->last_frame();
1474 assert(stub_frame.is_runtime_frame(), "sanity check");
1475 frame caller_frame = stub_frame.sender(®_map);
1476
1477 if (caller_frame.is_interpreted_frame() ||
1481 guarantee(callee != NULL && callee->is_method(), "bad handshake");
1482 current->set_vm_result_2(callee);
1483 current->set_callee_target(NULL);
1484 if (caller_frame.is_entry_frame() && VM_Version::supports_fast_class_init_checks()) {
1485 // Bypass class initialization checks in c2i when caller is in native.
1486 // JNI calls to static methods don't have class initialization checks.
1487 // Fast class initialization checks are present in c2i adapters and call into
1488 // SharedRuntime::handle_wrong_method() on the slow path.
1489 //
1490 // JVM upcalls may land here as well, but there's a proper check present in
1491 // LinkResolver::resolve_static_call (called from JavaCalls::call_static),
1492 // so bypassing it in c2i adapter is benign.
1493 return callee->get_c2i_no_clinit_check_entry();
1494 } else {
1495 return callee->get_c2i_entry();
1496 }
1497 }
1498
1499 // Must be compiled to compiled path which is safe to stackwalk
1500 methodHandle callee_method;
1501 JRT_BLOCK
1502 // Force resolving of caller (if we called from compiled frame)
1503 callee_method = SharedRuntime::reresolve_call_site(CHECK_NULL);
1504 current->set_vm_result_2(callee_method());
1505 JRT_BLOCK_END
1506 // return compiled code entry point after potential safepoints
1507 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1508 return callee_method->verified_code_entry();
1509 JRT_END
1510
1511 // Handle abstract method call
1512 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_abstract(JavaThread* current))
1513 // Verbose error message for AbstractMethodError.
1514 // Get the called method from the invoke bytecode.
1515 vframeStream vfst(current, true);
1516 assert(!vfst.at_end(), "Java frame must exist");
1517 methodHandle caller(current, vfst.method());
1518 Bytecode_invoke invoke(caller, vfst.bci());
1519 DEBUG_ONLY( invoke.verify(); )
1520
1521 // Find the compiled caller frame.
1522 RegisterMap reg_map(current);
1523 frame stubFrame = current->last_frame();
1524 assert(stubFrame.is_runtime_frame(), "must be");
1525 frame callerFrame = stubFrame.sender(®_map);
1526 assert(callerFrame.is_compiled_frame(), "must be");
1527
1528 // Install exception and return forward entry.
1529 address res = StubRoutines::throw_AbstractMethodError_entry();
1530 JRT_BLOCK
1531 methodHandle callee(current, invoke.static_target(current));
1532 if (!callee.is_null()) {
1533 oop recv = callerFrame.retrieve_receiver(®_map);
1534 Klass *recv_klass = (recv != NULL) ? recv->klass() : NULL;
1535 res = StubRoutines::forward_exception_entry();
1536 LinkResolver::throw_abstract_method_error(callee, recv_klass, CHECK_(res));
1537 }
1538 JRT_BLOCK_END
1539 return res;
1540 JRT_END
1541
1542
1543 // resolve a static call and patch code
1544 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread* current ))
1545 methodHandle callee_method;
1546 JRT_BLOCK
1547 callee_method = SharedRuntime::resolve_helper(false, false, CHECK_NULL);
1548 current->set_vm_result_2(callee_method());
1549 JRT_BLOCK_END
1550 // return compiled code entry point after potential safepoints
1551 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1552 return callee_method->verified_code_entry();
1553 JRT_END
1554
1555
1556 // resolve virtual call and update inline cache to monomorphic
1557 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread* current))
1558 methodHandle callee_method;
1559 JRT_BLOCK
1560 callee_method = SharedRuntime::resolve_helper(true, false, CHECK_NULL);
1561 current->set_vm_result_2(callee_method());
1562 JRT_BLOCK_END
1563 // return compiled code entry point after potential safepoints
1564 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1565 return callee_method->verified_code_entry();
1566 JRT_END
1567
1568
1569 // Resolve a virtual call that can be statically bound (e.g., always
1570 // monomorphic, so it has no inline cache). Patch code to resolved target.
1571 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread* current))
1572 methodHandle callee_method;
1573 JRT_BLOCK
1574 callee_method = SharedRuntime::resolve_helper(true, true, CHECK_NULL);
1575 current->set_vm_result_2(callee_method());
1576 JRT_BLOCK_END
1577 // return compiled code entry point after potential safepoints
1578 assert(callee_method->verified_code_entry() != NULL, " Jump to zero!");
1579 return callee_method->verified_code_entry();
1580 JRT_END
1581
1582 // The handle_ic_miss_helper_internal function returns false if it failed due
1583 // to either running out of vtable stubs or ic stubs due to IC transitions
1584 // to transitional states. The needs_ic_stub_refill value will be set if
1585 // the failure was due to running out of IC stubs, in which case handle_ic_miss_helper
1586 // refills the IC stubs and tries again.
1587 bool SharedRuntime::handle_ic_miss_helper_internal(Handle receiver, CompiledMethod* caller_nm,
1588 const frame& caller_frame, methodHandle callee_method,
1589 Bytecodes::Code bc, CallInfo& call_info,
1590 bool& needs_ic_stub_refill, TRAPS) {
1591 CompiledICLocker ml(caller_nm);
1592 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1593 bool should_be_mono = false;
1594 if (inline_cache->is_optimized()) {
1595 if (TraceCallFixup) {
1596 ResourceMark rm(THREAD);
1597 tty->print("OPTIMIZED IC miss (%s) call to", Bytecodes::name(bc));
1598 callee_method->print_short_name(tty);
1599 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1600 }
1601 should_be_mono = true;
1602 } else if (inline_cache->is_icholder_call()) {
1603 CompiledICHolder* ic_oop = inline_cache->cached_icholder();
1604 if (ic_oop != NULL) {
1605 if (!ic_oop->is_loader_alive()) {
1606 // Deferred IC cleaning due to concurrent class unloading
1607 if (!inline_cache->set_to_clean()) {
1608 needs_ic_stub_refill = true;
1609 return false;
1610 }
1611 } else if (receiver()->klass() == ic_oop->holder_klass()) {
1612 // This isn't a real miss. We must have seen that compiled code
1613 // is now available and we want the call site converted to a
1614 // monomorphic compiled call site.
1615 // We can't assert for callee_method->code() != NULL because it
1616 // could have been deoptimized in the meantime
1617 if (TraceCallFixup) {
1618 ResourceMark rm(THREAD);
1619 tty->print("FALSE IC miss (%s) converting to compiled call to", Bytecodes::name(bc));
1620 callee_method->print_short_name(tty);
1621 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1622 }
1623 should_be_mono = true;
1624 }
1625 }
1626 }
1627
1628 if (should_be_mono) {
1629 // We have a path that was monomorphic but was going interpreted
1630 // and now we have (or had) a compiled entry. We correct the IC
1631 // by using a new icBuffer.
1632 CompiledICInfo info;
1633 Klass* receiver_klass = receiver()->klass();
1634 inline_cache->compute_monomorphic_entry(callee_method,
1635 receiver_klass,
1636 inline_cache->is_optimized(),
1637 false, caller_nm->is_nmethod(),
1638 info, CHECK_false);
1639 if (!inline_cache->set_to_monomorphic(info)) {
1640 needs_ic_stub_refill = true;
1641 return false;
1642 }
1643 } else if (!inline_cache->is_megamorphic() && !inline_cache->is_clean()) {
1644 // Potential change to megamorphic
1645
1646 bool successful = inline_cache->set_to_megamorphic(&call_info, bc, needs_ic_stub_refill, CHECK_false);
1647 if (needs_ic_stub_refill) {
1648 return false;
1649 }
1650 if (!successful) {
1651 if (!inline_cache->set_to_clean()) {
1652 needs_ic_stub_refill = true;
1653 return false;
1654 }
1655 }
1656 } else {
1657 // Either clean or megamorphic
1658 }
1659 return true;
1660 }
1661
1662 methodHandle SharedRuntime::handle_ic_miss_helper(TRAPS) {
1663 JavaThread* current = THREAD;
1664 ResourceMark rm(current);
1665 CallInfo call_info;
1666 Bytecodes::Code bc;
1667
1668 // receiver is NULL for static calls. An exception is thrown for NULL
1669 // receivers for non-static calls
1670 Handle receiver = find_callee_info(bc, call_info, CHECK_(methodHandle()));
1671 // Compiler1 can produce virtual call sites that can actually be statically bound
1672 // If we fell thru to below we would think that the site was going megamorphic
1673 // when in fact the site can never miss. Worse because we'd think it was megamorphic
1674 // we'd try and do a vtable dispatch however methods that can be statically bound
1675 // don't have vtable entries (vtable_index < 0) and we'd blow up. So we force a
1676 // reresolution of the call site (as if we did a handle_wrong_method and not an
1677 // plain ic_miss) and the site will be converted to an optimized virtual call site
1678 // never to miss again. I don't believe C2 will produce code like this but if it
1679 // did this would still be the correct thing to do for it too, hence no ifdef.
1680 //
1681 if (call_info.resolved_method()->can_be_statically_bound()) {
1682 methodHandle callee_method = SharedRuntime::reresolve_call_site(CHECK_(methodHandle()));
1683 if (TraceCallFixup) {
1684 RegisterMap reg_map(current, false);
1685 frame caller_frame = current->last_frame().sender(®_map);
1686 ResourceMark rm(current);
1687 tty->print("converting IC miss to reresolve (%s) call to", Bytecodes::name(bc));
1688 callee_method->print_short_name(tty);
1689 tty->print_cr(" from pc: " INTPTR_FORMAT, p2i(caller_frame.pc()));
1690 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1691 }
1692 return callee_method;
1693 }
1694
1695 methodHandle callee_method(current, call_info.selected_method());
1696
1697 #ifndef PRODUCT
1698 Atomic::inc(&_ic_miss_ctr);
1699
1700 // Statistics & Tracing
1701 if (TraceCallFixup) {
1702 ResourceMark rm(current);
1712 // produce statistics under the lock
1713 trace_ic_miss(f.pc());
1714 }
1715 #endif
1716
1717 // install an event collector so that when a vtable stub is created the
1718 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The
1719 // event can't be posted when the stub is created as locks are held
1720 // - instead the event will be deferred until the event collector goes
1721 // out of scope.
1722 JvmtiDynamicCodeEventCollector event_collector;
1723
1724 // Update inline cache to megamorphic. Skip update if we are called from interpreted.
1725 // Transitioning IC caches may require transition stubs. If we run out
1726 // of transition stubs, we have to drop locks and perform a safepoint
1727 // that refills them.
1728 RegisterMap reg_map(current, false);
1729 frame caller_frame = current->last_frame().sender(®_map);
1730 CodeBlob* cb = caller_frame.cb();
1731 CompiledMethod* caller_nm = cb->as_compiled_method();
1732
1733 for (;;) {
1734 ICRefillVerifier ic_refill_verifier;
1735 bool needs_ic_stub_refill = false;
1736 bool successful = handle_ic_miss_helper_internal(receiver, caller_nm, caller_frame, callee_method,
1737 bc, call_info, needs_ic_stub_refill, CHECK_(methodHandle()));
1738 if (successful || !needs_ic_stub_refill) {
1739 return callee_method;
1740 } else {
1741 InlineCacheBuffer::refill_ic_stubs();
1742 }
1743 }
1744 }
1745
1746 static bool clear_ic_at_addr(CompiledMethod* caller_nm, address call_addr, bool is_static_call) {
1747 CompiledICLocker ml(caller_nm);
1748 if (is_static_call) {
1749 CompiledStaticCall* ssc = caller_nm->compiledStaticCall_at(call_addr);
1750 if (!ssc->is_clean()) {
1751 return ssc->set_to_clean();
1752 }
1753 } else {
1754 // compiled, dispatched call (which used to call an interpreted method)
1755 CompiledIC* inline_cache = CompiledIC_at(caller_nm, call_addr);
1756 if (!inline_cache->is_clean()) {
1757 return inline_cache->set_to_clean();
1758 }
1759 }
1760 return true;
1761 }
1762
1763 //
1764 // Resets a call-site in compiled code so it will get resolved again.
1765 // This routines handles both virtual call sites, optimized virtual call
1766 // sites, and static call sites. Typically used to change a call sites
1767 // destination from compiled to interpreted.
1768 //
1769 methodHandle SharedRuntime::reresolve_call_site(TRAPS) {
1770 JavaThread* current = THREAD;
1771 ResourceMark rm(current);
1772 RegisterMap reg_map(current, false);
1773 frame stub_frame = current->last_frame();
1774 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub");
1775 frame caller = stub_frame.sender(®_map);
1776
1777 // Do nothing if the frame isn't a live compiled frame.
1778 // nmethod could be deoptimized by the time we get here
1779 // so no update to the caller is needed.
1780
1781 if (caller.is_compiled_frame() && !caller.is_deoptimized_frame()) {
1782
1783 address pc = caller.pc();
1784
1785 // Check for static or virtual call
1786 bool is_static_call = false;
1787 CompiledMethod* caller_nm = CodeCache::find_compiled(pc);
1788
1789 // Default call_addr is the location of the "basic" call.
1790 // Determine the address of the call we a reresolving. With
1791 // Inline Caches we will always find a recognizable call.
1792 // With Inline Caches disabled we may or may not find a
1793 // recognizable call. We will always find a call for static
1794 // calls and for optimized virtual calls. For vanilla virtual
1795 // calls it depends on the state of the UseInlineCaches switch.
1796 //
1797 // With Inline Caches disabled we can get here for a virtual call
1798 // for two reasons:
1799 // 1 - calling an abstract method. The vtable for abstract methods
1800 // will run us thru handle_wrong_method and we will eventually
1801 // end up in the interpreter to throw the ame.
1802 // 2 - a racing deoptimization. We could be doing a vanilla vtable
1803 // call and between the time we fetch the entry address and
1804 // we jump to it the target gets deoptimized. Similar to 1
1805 // we will wind up in the interprter (thru a c2i with c2).
1806 //
1807 address call_addr = NULL;
1811 CompiledICLocker ml(caller_nm);
1812 // Location of call instruction
1813 call_addr = caller_nm->call_instruction_address(pc);
1814 }
1815 // Make sure nmethod doesn't get deoptimized and removed until
1816 // this is done with it.
1817 // CLEANUP - with lazy deopt shouldn't need this lock
1818 nmethodLocker nmlock(caller_nm);
1819
1820 if (call_addr != NULL) {
1821 RelocIterator iter(caller_nm, call_addr, call_addr+1);
1822 int ret = iter.next(); // Get item
1823 if (ret) {
1824 assert(iter.addr() == call_addr, "must find call");
1825 if (iter.type() == relocInfo::static_call_type) {
1826 is_static_call = true;
1827 } else {
1828 assert(iter.type() == relocInfo::virtual_call_type ||
1829 iter.type() == relocInfo::opt_virtual_call_type
1830 , "unexpected relocInfo. type");
1831 }
1832 } else {
1833 assert(!UseInlineCaches, "relocation info. must exist for this address");
1834 }
1835
1836 // Cleaning the inline cache will force a new resolve. This is more robust
1837 // than directly setting it to the new destination, since resolving of calls
1838 // is always done through the same code path. (experience shows that it
1839 // leads to very hard to track down bugs, if an inline cache gets updated
1840 // to a wrong method). It should not be performance critical, since the
1841 // resolve is only done once.
1842
1843 for (;;) {
1844 ICRefillVerifier ic_refill_verifier;
1845 if (!clear_ic_at_addr(caller_nm, call_addr, is_static_call)) {
1846 InlineCacheBuffer::refill_ic_stubs();
1847 } else {
1848 break;
1849 }
1850 }
1851 }
1852 }
1853
1854 methodHandle callee_method = find_callee_method(CHECK_(methodHandle()));
1855
1856
1857 #ifndef PRODUCT
1858 Atomic::inc(&_wrong_method_ctr);
1859
1860 if (TraceCallFixup) {
1861 ResourceMark rm(current);
1862 tty->print("handle_wrong_method reresolving call to");
1863 callee_method->print_short_name(tty);
1864 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1865 }
1866 #endif
1867
1868 return callee_method;
1869 }
1870
1871 address SharedRuntime::handle_unsafe_access(JavaThread* thread, address next_pc) {
1872 // The faulting unsafe accesses should be changed to throw the error
1873 // synchronously instead. Meanwhile the faulting instruction will be
1874 // skipped over (effectively turning it into a no-op) and an
1875 // asynchronous exception will be raised which the thread will
1876 // handle at a later point. If the instruction is a load it will
1932 if (TraceCallFixup) {
1933 tty->print("already patched callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc));
1934 moop->print_short_name(tty);
1935 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point));
1936 }
1937 }
1938 return false;
1939 }
1940
1941 // ---------------------------------------------------------------------------
1942 // We are calling the interpreter via a c2i. Normally this would mean that
1943 // we were called by a compiled method. However we could have lost a race
1944 // where we went int -> i2c -> c2i and so the caller could in fact be
1945 // interpreted. If the caller is compiled we attempt to patch the caller
1946 // so he no longer calls into the interpreter.
1947 JRT_LEAF(void, SharedRuntime::fixup_callers_callsite(Method* method, address caller_pc))
1948 Method* moop(method);
1949
1950 AARCH64_PORT_ONLY(assert(pauth_ptr_is_raw(caller_pc), "should be raw"));
1951
1952 address entry_point = moop->from_compiled_entry_no_trampoline();
1953
1954 // It's possible that deoptimization can occur at a call site which hasn't
1955 // been resolved yet, in which case this function will be called from
1956 // an nmethod that has been patched for deopt and we can ignore the
1957 // request for a fixup.
1958 // Also it is possible that we lost a race in that from_compiled_entry
1959 // is now back to the i2c in that case we don't need to patch and if
1960 // we did we'd leap into space because the callsite needs to use
1961 // "to interpreter" stub in order to load up the Method*. Don't
1962 // ask me how I know this...
1963
1964 CodeBlob* cb = CodeCache::find_blob(caller_pc);
1965 if (cb == NULL || !cb->is_compiled() || entry_point == moop->get_c2i_entry()) {
1966 return;
1967 }
1968
1969 // The check above makes sure this is a nmethod.
1970 CompiledMethod* nm = cb->as_compiled_method_or_null();
1971 assert(nm, "must be");
1972
1973 // Get the return PC for the passed caller PC.
1974 address return_pc = caller_pc + frame::pc_return_offset;
1975
1976 // There is a benign race here. We could be attempting to patch to a compiled
1977 // entry point at the same time the callee is being deoptimized. If that is
1978 // the case then entry_point may in fact point to a c2i and we'd patch the
1979 // call site with the same old data. clear_code will set code() to NULL
1980 // at the end of it. If we happen to see that NULL then we can skip trying
1981 // to patch. If we hit the window where the callee has a c2i in the
1982 // from_compiled_entry and the NULL isn't present yet then we lose the race
1983 // and patch the code with the same old data. Asi es la vida.
1984
1985 if (moop->code() == NULL) return;
2320 private:
2321 enum {
2322 _basic_type_bits = 4,
2323 _basic_type_mask = right_n_bits(_basic_type_bits),
2324 _basic_types_per_int = BitsPerInt / _basic_type_bits,
2325 _compact_int_count = 3
2326 };
2327 // TO DO: Consider integrating this with a more global scheme for compressing signatures.
2328 // For now, 4 bits per components (plus T_VOID gaps after double/long) is not excessive.
2329
2330 union {
2331 int _compact[_compact_int_count];
2332 int* _fingerprint;
2333 } _value;
2334 int _length; // A negative length indicates the fingerprint is in the compact form,
2335 // Otherwise _value._fingerprint is the array.
2336
2337 // Remap BasicTypes that are handled equivalently by the adapters.
2338 // These are correct for the current system but someday it might be
2339 // necessary to make this mapping platform dependent.
2340 static int adapter_encoding(BasicType in) {
2341 switch (in) {
2342 case T_BOOLEAN:
2343 case T_BYTE:
2344 case T_SHORT:
2345 case T_CHAR:
2346 // There are all promoted to T_INT in the calling convention
2347 return T_INT;
2348
2349 case T_OBJECT:
2350 case T_ARRAY:
2351 // In other words, we assume that any register good enough for
2352 // an int or long is good enough for a managed pointer.
2353 #ifdef _LP64
2354 return T_LONG;
2355 #else
2356 return T_INT;
2357 #endif
2358
2359 case T_INT:
2360 case T_LONG:
2361 case T_FLOAT:
2362 case T_DOUBLE:
2363 case T_VOID:
2364 return in;
2365
2366 default:
2367 ShouldNotReachHere();
2368 return T_CONFLICT;
2369 }
2370 }
2371
2372 public:
2373 AdapterFingerPrint(int total_args_passed, BasicType* sig_bt) {
2374 // The fingerprint is based on the BasicType signature encoded
2375 // into an array of ints with eight entries per int.
2376 int* ptr;
2377 int len = (total_args_passed + (_basic_types_per_int-1)) / _basic_types_per_int;
2378 if (len <= _compact_int_count) {
2379 assert(_compact_int_count == 3, "else change next line");
2380 _value._compact[0] = _value._compact[1] = _value._compact[2] = 0;
2381 // Storing the signature encoded as signed chars hits about 98%
2382 // of the time.
2383 _length = -len;
2384 ptr = _value._compact;
2385 } else {
2386 _length = len;
2387 _value._fingerprint = NEW_C_HEAP_ARRAY(int, _length, mtCode);
2388 ptr = _value._fingerprint;
2389 }
2390
2391 // Now pack the BasicTypes with 8 per int
2392 int sig_index = 0;
2393 for (int index = 0; index < len; index++) {
2394 int value = 0;
2395 for (int byte = 0; sig_index < total_args_passed && byte < _basic_types_per_int; byte++) {
2396 int bt = adapter_encoding(sig_bt[sig_index++]);
2397 assert((bt & _basic_type_mask) == bt, "must fit in 4 bits");
2398 value = (value << _basic_type_bits) | bt;
2399 }
2400 ptr[index] = value;
2401 }
2402 }
2403
2404 ~AdapterFingerPrint() {
2405 if (_length > 0) {
2406 FREE_C_HEAP_ARRAY(int, _value._fingerprint);
2407 }
2408 }
2409
2410 int value(int index) {
2411 if (_length < 0) {
2412 return _value._compact[index];
2413 }
2414 return _value._fingerprint[index];
2415 }
2416 int length() {
2417 if (_length < 0) return -_length;
2418 return _length;
2419 }
2420
2421 bool is_compact() {
2446 const char* as_basic_args_string() {
2447 stringStream st;
2448 bool long_prev = false;
2449 for (int i = 0; i < length(); i++) {
2450 unsigned val = (unsigned)value(i);
2451 // args are packed so that first/lower arguments are in the highest
2452 // bits of each int value, so iterate from highest to the lowest
2453 for (int j = 32 - _basic_type_bits; j >= 0; j -= _basic_type_bits) {
2454 unsigned v = (val >> j) & _basic_type_mask;
2455 if (v == 0) {
2456 assert(i == length() - 1, "Only expect zeroes in the last word");
2457 continue;
2458 }
2459 if (long_prev) {
2460 long_prev = false;
2461 if (v == T_VOID) {
2462 st.print("J");
2463 } else {
2464 st.print("L");
2465 }
2466 }
2467 switch (v) {
2468 case T_INT: st.print("I"); break;
2469 case T_LONG: long_prev = true; break;
2470 case T_FLOAT: st.print("F"); break;
2471 case T_DOUBLE: st.print("D"); break;
2472 case T_VOID: break;
2473 default: ShouldNotReachHere();
2474 }
2475 }
2476 }
2477 if (long_prev) {
2478 st.print("L");
2479 }
2480 return st.as_string();
2481 }
2482 #endif // !product
2483
2484 bool equals(AdapterFingerPrint* other) {
2485 if (other->_length != _length) {
2486 return false;
2487 }
2488 if (_length < 0) {
2489 assert(_compact_int_count == 3, "else change next line");
2490 return _value._compact[0] == other->_value._compact[0] &&
2491 _value._compact[1] == other->_value._compact[1] &&
2492 _value._compact[2] == other->_value._compact[2];
2493 } else {
2508
2509 private:
2510
2511 #ifndef PRODUCT
2512 static int _lookups; // number of calls to lookup
2513 static int _buckets; // number of buckets checked
2514 static int _equals; // number of buckets checked with matching hash
2515 static int _hits; // number of successful lookups
2516 static int _compact; // number of equals calls with compact signature
2517 #endif
2518
2519 AdapterHandlerEntry* bucket(int i) {
2520 return (AdapterHandlerEntry*)BasicHashtable<mtCode>::bucket(i);
2521 }
2522
2523 public:
2524 AdapterHandlerTable()
2525 : BasicHashtable<mtCode>(293, (sizeof(AdapterHandlerEntry))) { }
2526
2527 // Create a new entry suitable for insertion in the table
2528 AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry, address c2i_unverified_entry, address c2i_no_clinit_check_entry) {
2529 AdapterHandlerEntry* entry = (AdapterHandlerEntry*)BasicHashtable<mtCode>::new_entry(fingerprint->compute_hash());
2530 entry->init(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry, c2i_no_clinit_check_entry);
2531 return entry;
2532 }
2533
2534 // Insert an entry into the table
2535 void add(AdapterHandlerEntry* entry) {
2536 int index = hash_to_index(entry->hash());
2537 add_entry(index, entry);
2538 }
2539
2540 void free_entry(AdapterHandlerEntry* entry) {
2541 entry->deallocate();
2542 BasicHashtable<mtCode>::free_entry(entry);
2543 }
2544
2545 // Find a entry with the same fingerprint if it exists
2546 AdapterHandlerEntry* lookup(int total_args_passed, BasicType* sig_bt) {
2547 NOT_PRODUCT(_lookups++);
2548 AdapterFingerPrint fp(total_args_passed, sig_bt);
2549 unsigned int hash = fp.compute_hash();
2550 int index = hash_to_index(hash);
2551 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) {
2552 NOT_PRODUCT(_buckets++);
2553 if (e->hash() == hash) {
2554 NOT_PRODUCT(_equals++);
2555 if (fp.equals(e->fingerprint())) {
2556 #ifndef PRODUCT
2557 if (fp.is_compact()) _compact++;
2558 _hits++;
2559 #endif
2560 return e;
2561 }
2562 }
2563 }
2564 return NULL;
2565 }
2566
2567 #ifndef PRODUCT
2568 void print_statistics() {
2629 AdapterHandlerEntry* result = _current;
2630 _current = _current->next();
2631 if (_current == NULL) scan();
2632 return result;
2633 } else {
2634 return NULL;
2635 }
2636 }
2637 };
2638
2639
2640 // ---------------------------------------------------------------------------
2641 // Implementation of AdapterHandlerLibrary
2642 AdapterHandlerTable* AdapterHandlerLibrary::_adapters = NULL;
2643 AdapterHandlerEntry* AdapterHandlerLibrary::_abstract_method_handler = NULL;
2644 AdapterHandlerEntry* AdapterHandlerLibrary::_no_arg_handler = NULL;
2645 AdapterHandlerEntry* AdapterHandlerLibrary::_int_arg_handler = NULL;
2646 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_arg_handler = NULL;
2647 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_int_arg_handler = NULL;
2648 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_obj_arg_handler = NULL;
2649 const int AdapterHandlerLibrary_size = 16*K;
2650 BufferBlob* AdapterHandlerLibrary::_buffer = NULL;
2651
2652 BufferBlob* AdapterHandlerLibrary::buffer_blob() {
2653 return _buffer;
2654 }
2655
2656 extern "C" void unexpected_adapter_call() {
2657 ShouldNotCallThis();
2658 }
2659
2660 static void post_adapter_creation(const AdapterBlob* new_adapter, const AdapterHandlerEntry* entry) {
2661 char blob_id[256];
2662 jio_snprintf(blob_id,
2663 sizeof(blob_id),
2664 "%s(%s)",
2665 new_adapter->name(),
2666 entry->fingerprint()->as_string());
2667 Forte::register_stub(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2668
2669 if (JvmtiExport::should_post_dynamic_code_generated()) {
2673
2674 void AdapterHandlerLibrary::initialize() {
2675 ResourceMark rm;
2676 AdapterBlob* no_arg_blob = NULL;
2677 AdapterBlob* int_arg_blob = NULL;
2678 AdapterBlob* obj_arg_blob = NULL;
2679 AdapterBlob* obj_int_arg_blob = NULL;
2680 AdapterBlob* obj_obj_arg_blob = NULL;
2681 {
2682 MutexLocker mu(AdapterHandlerLibrary_lock);
2683 assert(_adapters == NULL, "Initializing more than once");
2684
2685 _adapters = new AdapterHandlerTable();
2686
2687 // Create a special handler for abstract methods. Abstract methods
2688 // are never compiled so an i2c entry is somewhat meaningless, but
2689 // throw AbstractMethodError just in case.
2690 // Pass wrong_method_abstract for the c2i transitions to return
2691 // AbstractMethodError for invalid invocations.
2692 address wrong_method_abstract = SharedRuntime::get_handle_wrong_method_abstract_stub();
2693 _abstract_method_handler = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(0, NULL),
2694 StubRoutines::throw_AbstractMethodError_entry(),
2695 wrong_method_abstract, wrong_method_abstract);
2696
2697 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size);
2698
2699 _no_arg_handler = create_adapter(no_arg_blob, 0, NULL, true);
2700
2701 BasicType obj_args[] = { T_OBJECT };
2702 _obj_arg_handler = create_adapter(obj_arg_blob, 1, obj_args, true);
2703
2704 BasicType int_args[] = { T_INT };
2705 _int_arg_handler = create_adapter(int_arg_blob, 1, int_args, true);
2706
2707 BasicType obj_int_args[] = { T_OBJECT, T_INT };
2708 _obj_int_arg_handler = create_adapter(obj_int_arg_blob, 2, obj_int_args, true);
2709
2710 BasicType obj_obj_args[] = { T_OBJECT, T_OBJECT };
2711 _obj_obj_arg_handler = create_adapter(obj_obj_arg_blob, 2, obj_obj_args, true);
2712
2713 assert(no_arg_blob != NULL &&
2714 obj_arg_blob != NULL &&
2715 int_arg_blob != NULL &&
2716 obj_int_arg_blob != NULL &&
2717 obj_obj_arg_blob != NULL, "Initial adapters must be properly created");
2718 }
2719
2720 // Outside of the lock
2721 post_adapter_creation(no_arg_blob, _no_arg_handler);
2722 post_adapter_creation(obj_arg_blob, _obj_arg_handler);
2723 post_adapter_creation(int_arg_blob, _int_arg_handler);
2724 post_adapter_creation(obj_int_arg_blob, _obj_int_arg_handler);
2725 post_adapter_creation(obj_obj_arg_blob, _obj_obj_arg_handler);
2726 }
2727
2728 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint,
2729 address i2c_entry,
2730 address c2i_entry,
2731 address c2i_unverified_entry,
2732 address c2i_no_clinit_check_entry) {
2733 return _adapters->new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry, c2i_no_clinit_check_entry);
2734 }
2735
2736 AdapterHandlerEntry* AdapterHandlerLibrary::get_simple_adapter(const methodHandle& method) {
2737 if (method->is_abstract()) {
2738 return _abstract_method_handler;
2739 }
2740 int total_args_passed = method->size_of_parameters(); // All args on stack
2741 if (total_args_passed == 0) {
2742 return _no_arg_handler;
2743 } else if (total_args_passed == 1) {
2744 if (!method->is_static()) {
2745 return _obj_arg_handler;
2746 }
2747 switch (method->signature()->char_at(1)) {
2748 case JVM_SIGNATURE_CLASS:
2749 case JVM_SIGNATURE_ARRAY:
2750 return _obj_arg_handler;
2751 case JVM_SIGNATURE_INT:
2752 case JVM_SIGNATURE_BOOLEAN:
2753 case JVM_SIGNATURE_CHAR:
2754 case JVM_SIGNATURE_BYTE:
2755 case JVM_SIGNATURE_SHORT:
2756 return _int_arg_handler;
2757 }
2758 } else if (total_args_passed == 2 &&
2759 !method->is_static()) {
2760 switch (method->signature()->char_at(1)) {
2761 case JVM_SIGNATURE_CLASS:
2762 case JVM_SIGNATURE_ARRAY:
2763 return _obj_obj_arg_handler;
2764 case JVM_SIGNATURE_INT:
2765 case JVM_SIGNATURE_BOOLEAN:
2766 case JVM_SIGNATURE_CHAR:
2767 case JVM_SIGNATURE_BYTE:
2768 case JVM_SIGNATURE_SHORT:
2769 return _obj_int_arg_handler;
2770 }
2771 }
2772 return NULL;
2773 }
2774
2775 class AdapterSignatureIterator : public SignatureIterator {
2776 private:
2777 BasicType stack_sig_bt[16];
2778 BasicType* sig_bt;
2779 int index;
2780
2781 public:
2782 AdapterSignatureIterator(Symbol* signature,
2783 fingerprint_t fingerprint,
2784 bool is_static,
2785 int total_args_passed) :
2786 SignatureIterator(signature, fingerprint),
2787 index(0)
2788 {
2789 sig_bt = (total_args_passed <= 16) ? stack_sig_bt : NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
2790 if (!is_static) { // Pass in receiver first
2791 sig_bt[index++] = T_OBJECT;
2792 }
2793 do_parameters_on(this);
2794 }
2795
2796 BasicType* basic_types() {
2797 return sig_bt;
2798 }
2799
2800 #ifdef ASSERT
2801 int slots() {
2802 return index;
2803 }
2804 #endif
2805
2806 private:
2807
2808 friend class SignatureIterator; // so do_parameters_on can call do_type
2809 void do_type(BasicType type) {
2810 sig_bt[index++] = type;
2811 if (type == T_LONG || type == T_DOUBLE) {
2812 sig_bt[index++] = T_VOID; // Longs & doubles take 2 Java slots
2813 }
2814 }
2815 };
2816
2817 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(const methodHandle& method) {
2818 // Use customized signature handler. Need to lock around updates to
2819 // the AdapterHandlerTable (it is not safe for concurrent readers
2820 // and a single writer: this could be fixed if it becomes a
2821 // problem).
2822 assert(_adapters != NULL, "Uninitialized");
2823
2824 // Fast-path for trivial adapters
2825 AdapterHandlerEntry* entry = get_simple_adapter(method);
2826 if (entry != NULL) {
2827 return entry;
2828 }
2829
2830 ResourceMark rm;
2831 AdapterBlob* new_adapter = NULL;
2832
2833 // Fill in the signature array, for the calling-convention call.
2834 int total_args_passed = method->size_of_parameters(); // All args on stack
2835
2836 AdapterSignatureIterator si(method->signature(), method->constMethod()->fingerprint(),
2837 method->is_static(), total_args_passed);
2838 assert(si.slots() == total_args_passed, "");
2839 BasicType* sig_bt = si.basic_types();
2840 {
2841 MutexLocker mu(AdapterHandlerLibrary_lock);
2842
2843 // Lookup method signature's fingerprint
2844 entry = _adapters->lookup(total_args_passed, sig_bt);
2845
2846 if (entry != NULL) {
2847 #ifdef ASSERT
2848 if (VerifyAdapterSharing) {
2849 AdapterBlob* comparison_blob = NULL;
2850 AdapterHandlerEntry* comparison_entry = create_adapter(comparison_blob, total_args_passed, sig_bt, false);
2851 assert(comparison_blob == NULL, "no blob should be created when creating an adapter for comparison");
2852 assert(comparison_entry->compare_code(entry), "code must match");
2853 // Release the one just created and return the original
2854 _adapters->free_entry(comparison_entry);
2855 }
2856 #endif
2857 return entry;
2858 }
2859
2860 entry = create_adapter(new_adapter, total_args_passed, sig_bt, /* allocate_code_blob */ true);
2861 }
2862
2863 // Outside of the lock
2864 if (new_adapter != NULL) {
2865 post_adapter_creation(new_adapter, entry);
2866 }
2867 return entry;
2868 }
2869
2870 AdapterHandlerEntry* AdapterHandlerLibrary::create_adapter(AdapterBlob*& new_adapter,
2871 int total_args_passed,
2872 BasicType* sig_bt,
2873 bool allocate_code_blob) {
2874
2875 // StubRoutines::code2() is initialized after this function can be called. As a result,
2876 // VerifyAdapterCalls and VerifyAdapterSharing can fail if we re-use code that generated
2877 // prior to StubRoutines::code2() being set. Checks refer to checks generated in an I2C
2878 // stub that ensure that an I2C stub is called from an interpreter frame.
2879 bool contains_all_checks = StubRoutines::code2() != NULL;
2880
2881 VMRegPair stack_regs[16];
2882 VMRegPair* regs = (total_args_passed <= 16) ? stack_regs : NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
2883
2884 // Get a description of the compiled java calling convention and the largest used (VMReg) stack slot usage
2885 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed);
2886 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
2887 CodeBuffer buffer(buf);
2888 short buffer_locs[20];
2889 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs,
2890 sizeof(buffer_locs)/sizeof(relocInfo));
2891
2892 // Make a C heap allocated version of the fingerprint to store in the adapter
2893 AdapterFingerPrint* fingerprint = new AdapterFingerPrint(total_args_passed, sig_bt);
2894 MacroAssembler _masm(&buffer);
2895 AdapterHandlerEntry* entry = SharedRuntime::generate_i2c2i_adapters(&_masm,
2896 total_args_passed,
2897 comp_args_on_stack,
2898 sig_bt,
2899 regs,
2900 fingerprint);
2901
2902 #ifdef ASSERT
2903 if (VerifyAdapterSharing) {
2904 entry->save_code(buf->code_begin(), buffer.insts_size());
2905 if (!allocate_code_blob) {
2906 return entry;
2907 }
2908 }
2909 #endif
2910
2911 new_adapter = AdapterBlob::create(&buffer);
2912 NOT_PRODUCT(int insts_size = buffer.insts_size());
2913 if (new_adapter == NULL) {
2914 // CodeCache is full, disable compilation
2915 // Ought to log this but compile log is only per compile thread
2916 // and we're some non descript Java thread.
2917 return NULL;
2918 }
2919 entry->relocate(new_adapter->content_begin());
2920 #ifndef PRODUCT
2921 // debugging suppport
2922 if (PrintAdapterHandlers || PrintStubCode) {
2923 ttyLocker ttyl;
2924 entry->print_adapter_on(tty);
2925 tty->print_cr("i2c argument handler #%d for: %s %s (%d bytes generated)",
2926 _adapters->number_of_entries(), fingerprint->as_basic_args_string(),
2927 fingerprint->as_string(), insts_size);
2928 tty->print_cr("c2i argument handler starts at %p", entry->get_c2i_entry());
2929 if (Verbose || PrintStubCode) {
2930 address first_pc = entry->base_address();
2931 if (first_pc != NULL) {
2932 Disassembler::decode(first_pc, first_pc + insts_size, tty
2933 NOT_PRODUCT(COMMA &new_adapter->asm_remarks()));
2934 tty->cr();
2935 }
2936 }
2937 }
2938 #endif
2939
2940 // Add the entry only if the entry contains all required checks (see sharedRuntime_xxx.cpp)
2941 // The checks are inserted only if -XX:+VerifyAdapterCalls is specified.
2942 if (contains_all_checks || !VerifyAdapterCalls) {
2943 _adapters->add(entry);
2944 }
2945 return entry;
2946 }
2947
2948 address AdapterHandlerEntry::base_address() {
2949 address base = _i2c_entry;
2950 if (base == NULL) base = _c2i_entry;
2951 assert(base <= _c2i_entry || _c2i_entry == NULL, "");
2952 assert(base <= _c2i_unverified_entry || _c2i_unverified_entry == NULL, "");
2953 assert(base <= _c2i_no_clinit_check_entry || _c2i_no_clinit_check_entry == NULL, "");
2954 return base;
2955 }
2956
2957 void AdapterHandlerEntry::relocate(address new_base) {
2958 address old_base = base_address();
2959 assert(old_base != NULL, "");
2960 ptrdiff_t delta = new_base - old_base;
2961 if (_i2c_entry != NULL)
2962 _i2c_entry += delta;
2963 if (_c2i_entry != NULL)
2964 _c2i_entry += delta;
2965 if (_c2i_unverified_entry != NULL)
2966 _c2i_unverified_entry += delta;
2967 if (_c2i_no_clinit_check_entry != NULL)
2968 _c2i_no_clinit_check_entry += delta;
2969 assert(base_address() == new_base, "");
2970 }
2971
2972
2973 void AdapterHandlerEntry::deallocate() {
2974 delete _fingerprint;
2975 #ifdef ASSERT
2976 FREE_C_HEAP_ARRAY(unsigned char, _saved_code);
2977 #endif
2978 }
2979
2980
2981 #ifdef ASSERT
2982 // Capture the code before relocation so that it can be compared
2983 // against other versions. If the code is captured after relocation
2984 // then relative instructions won't be equivalent.
2985 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length) {
2986 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length, mtCode);
2987 _saved_code_length = length;
2988 memcpy(_saved_code, buffer, length);
2989 }
2990
2991
2992 bool AdapterHandlerEntry::compare_code(AdapterHandlerEntry* other) {
2993 assert(_saved_code != NULL && other->_saved_code != NULL, "code not saved");
2994
3027 assert(compile_id > 0, "Must generate native wrapper");
3028
3029
3030 ResourceMark rm;
3031 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
3032 if (buf != NULL) {
3033 CodeBuffer buffer(buf);
3034 struct { double data[20]; } locs_buf;
3035 buffer.insts()->initialize_shared_locs((relocInfo*)&locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
3036 #if defined(AARCH64)
3037 // On AArch64 with ZGC and nmethod entry barriers, we need all oops to be
3038 // in the constant pool to ensure ordering between the barrier and oops
3039 // accesses. For native_wrappers we need a constant.
3040 buffer.initialize_consts_size(8);
3041 #endif
3042 MacroAssembler _masm(&buffer);
3043
3044 // Fill in the signature array, for the calling-convention call.
3045 const int total_args_passed = method->size_of_parameters();
3046
3047 VMRegPair stack_regs[16];
3048 VMRegPair* regs = (total_args_passed <= 16) ? stack_regs : NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
3049
3050 AdapterSignatureIterator si(method->signature(), method->constMethod()->fingerprint(),
3051 method->is_static(), total_args_passed);
3052 BasicType* sig_bt = si.basic_types();
3053 assert(si.slots() == total_args_passed, "");
3054 BasicType ret_type = si.return_type();
3055
3056 // Now get the compiled-Java arguments layout.
3057 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed);
3058
3059 // Generate the compiled-to-native wrapper code
3060 nm = SharedRuntime::generate_native_wrapper(&_masm, method, compile_id, sig_bt, regs, ret_type);
3061
3062 if (nm != NULL) {
3063 {
3064 MutexLocker pl(CompiledMethod_lock, Mutex::_no_safepoint_check_flag);
3065 if (nm->make_in_use()) {
3066 method->set_code(method, nm);
3067 }
3068 }
3069
3070 DirectiveSet* directive = DirectivesStack::getDefaultDirective(CompileBroker::compiler(CompLevel_simple));
3071 if (directive->PrintAssemblyOption) {
3072 nm->print_code();
3073 }
3074 DirectivesStack::release(directive);
3255 AdapterHandlerTableIterator iter(_adapters);
3256 while (iter.has_next()) {
3257 AdapterHandlerEntry* a = iter.next();
3258 if (b == CodeCache::find_blob(a->get_i2c_entry())) {
3259 st->print("Adapter for signature: ");
3260 a->print_adapter_on(tty);
3261 return;
3262 }
3263 }
3264 assert(false, "Should have found handler");
3265 }
3266
3267 void AdapterHandlerEntry::print_adapter_on(outputStream* st) const {
3268 st->print("AHE@" INTPTR_FORMAT ": %s", p2i(this), fingerprint()->as_string());
3269 if (get_i2c_entry() != NULL) {
3270 st->print(" i2c: " INTPTR_FORMAT, p2i(get_i2c_entry()));
3271 }
3272 if (get_c2i_entry() != NULL) {
3273 st->print(" c2i: " INTPTR_FORMAT, p2i(get_c2i_entry()));
3274 }
3275 if (get_c2i_unverified_entry() != NULL) {
3276 st->print(" c2iUV: " INTPTR_FORMAT, p2i(get_c2i_unverified_entry()));
3277 }
3278 if (get_c2i_no_clinit_check_entry() != NULL) {
3279 st->print(" c2iNCI: " INTPTR_FORMAT, p2i(get_c2i_no_clinit_check_entry()));
3280 }
3281 st->cr();
3282 }
3283
3284 #ifndef PRODUCT
3285
3286 void AdapterHandlerLibrary::print_statistics() {
3287 _adapters->print_statistics();
3288 }
3289
3290 #endif /* PRODUCT */
3291
3292 JRT_LEAF(void, SharedRuntime::enable_stack_reserved_zone(JavaThread* current))
3293 StackOverflow* overflow_state = current->stack_overflow_state();
3294 overflow_state->enable_stack_reserved_zone(/*check_if_disabled*/true);
3295 overflow_state->set_reserved_stack_activation(current->stack_base());
3296 JRT_END
3341 break;
3342 } else {
3343 fr = fr.java_sender();
3344 }
3345 }
3346 return activation;
3347 }
3348
3349 void SharedRuntime::on_slowpath_allocation_exit(JavaThread* current) {
3350 // After any safepoint, just before going back to compiled code,
3351 // we inform the GC that we will be doing initializing writes to
3352 // this object in the future without emitting card-marks, so
3353 // GC may take any compensating steps.
3354
3355 oop new_obj = current->vm_result();
3356 if (new_obj == NULL) return;
3357
3358 BarrierSet *bs = BarrierSet::barrier_set();
3359 bs->on_slowpath_allocation_exit(current, new_obj);
3360 }
|
27 #include "jvm.h"
28 #include "classfile/stringTable.hpp"
29 #include "classfile/vmClasses.hpp"
30 #include "classfile/vmSymbols.hpp"
31 #include "code/codeCache.hpp"
32 #include "code/compiledIC.hpp"
33 #include "code/icBuffer.hpp"
34 #include "code/compiledMethod.inline.hpp"
35 #include "code/scopeDesc.hpp"
36 #include "code/vtableStubs.hpp"
37 #include "compiler/abstractCompiler.hpp"
38 #include "compiler/compileBroker.hpp"
39 #include "compiler/disassembler.hpp"
40 #include "gc/shared/barrierSet.hpp"
41 #include "gc/shared/collectedHeap.hpp"
42 #include "gc/shared/gcLocker.inline.hpp"
43 #include "interpreter/interpreter.hpp"
44 #include "interpreter/interpreterRuntime.hpp"
45 #include "jfr/jfrEvents.hpp"
46 #include "logging/log.hpp"
47 #include "memory/oopFactory.hpp"
48 #include "memory/resourceArea.hpp"
49 #include "memory/universe.hpp"
50 #include "oops/access.hpp"
51 #include "oops/fieldStreams.inline.hpp"
52 #include "oops/compiledICHolder.inline.hpp"
53 #include "oops/klass.hpp"
54 #include "oops/method.inline.hpp"
55 #include "oops/objArrayKlass.hpp"
56 #include "oops/objArrayOop.inline.hpp"
57 #include "oops/oop.inline.hpp"
58 #include "oops/inlineKlass.inline.hpp"
59 #include "prims/forte.hpp"
60 #include "prims/jvmtiExport.hpp"
61 #include "prims/methodHandles.hpp"
62 #include "prims/nativeLookup.hpp"
63 #include "runtime/atomic.hpp"
64 #include "runtime/frame.inline.hpp"
65 #include "runtime/handles.inline.hpp"
66 #include "runtime/init.hpp"
67 #include "runtime/interfaceSupport.inline.hpp"
68 #include "runtime/java.hpp"
69 #include "runtime/javaCalls.hpp"
70 #include "runtime/sharedRuntime.hpp"
71 #include "runtime/stackWatermarkSet.hpp"
72 #include "runtime/stubRoutines.hpp"
73 #include "runtime/synchronizer.hpp"
74 #include "runtime/vframe.inline.hpp"
75 #include "runtime/vframeArray.hpp"
76 #include "runtime/vm_version.hpp"
77 #include "utilities/copy.hpp"
78 #include "utilities/dtrace.hpp"
79 #include "utilities/events.hpp"
80 #include "utilities/hashtable.inline.hpp"
81 #include "utilities/macros.hpp"
82 #include "utilities/xmlstream.hpp"
83 #ifdef COMPILER1
84 #include "c1/c1_Runtime1.hpp"
85 #endif
86
87 // Shared stub locations
88 RuntimeStub* SharedRuntime::_wrong_method_blob;
89 RuntimeStub* SharedRuntime::_wrong_method_abstract_blob;
90 RuntimeStub* SharedRuntime::_ic_miss_blob;
91 RuntimeStub* SharedRuntime::_resolve_opt_virtual_call_blob;
92 RuntimeStub* SharedRuntime::_resolve_virtual_call_blob;
93 RuntimeStub* SharedRuntime::_resolve_static_call_blob;
94
95 DeoptimizationBlob* SharedRuntime::_deopt_blob;
96 SafepointBlob* SharedRuntime::_polling_page_vectors_safepoint_handler_blob;
97 SafepointBlob* SharedRuntime::_polling_page_safepoint_handler_blob;
98 SafepointBlob* SharedRuntime::_polling_page_return_handler_blob;
99
100 #ifdef COMPILER2
101 UncommonTrapBlob* SharedRuntime::_uncommon_trap_blob;
102 #endif // COMPILER2
103
104
105 //----------------------------generate_stubs-----------------------------------
106 void SharedRuntime::generate_stubs() {
107 _wrong_method_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method), "wrong_method_stub");
108 _wrong_method_abstract_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_abstract), "wrong_method_abstract_stub");
109 _ic_miss_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::handle_wrong_method_ic_miss), "ic_miss_stub");
110 _resolve_opt_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_opt_virtual_call_C), "resolve_opt_virtual_call");
111 _resolve_virtual_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_virtual_call_C), "resolve_virtual_call");
112 _resolve_static_call_blob = generate_resolve_blob(CAST_FROM_FN_PTR(address, SharedRuntime::resolve_static_call_C), "resolve_static_call");
113
114 AdapterHandlerLibrary::initialize();
115
116 #if COMPILER2_OR_JVMCI
117 // Vectors are generated only by C2 and JVMCI.
118 bool support_wide = is_wide_vector(MaxVectorSize);
119 if (support_wide) {
120 _polling_page_vectors_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_VECTOR_LOOP);
121 }
122 #endif // COMPILER2_OR_JVMCI
123 _polling_page_safepoint_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_LOOP);
124 _polling_page_return_handler_blob = generate_handler_blob(CAST_FROM_FN_PTR(address, SafepointSynchronize::handle_polling_page_exception), POLL_AT_RETURN);
125
126 generate_deopt_blob();
127
128 #ifdef COMPILER2
129 generate_uncommon_trap_blob();
130 #endif // COMPILER2
131 }
132
972 // forwarded before we look at the return value.
973 THROW_(vmSymbols::java_lang_UnsatisfiedLinkError(), (void*)badAddress);
974 }
975 JNI_END
976
977 address SharedRuntime::native_method_throw_unsatisfied_link_error_entry() {
978 return CAST_FROM_FN_PTR(address, &throw_unsatisfied_link_error);
979 }
980
981 JRT_ENTRY_NO_ASYNC(void, SharedRuntime::register_finalizer(JavaThread* current, oopDesc* obj))
982 #if INCLUDE_JVMCI
983 if (!obj->klass()->has_finalizer()) {
984 return;
985 }
986 #endif // INCLUDE_JVMCI
987 assert(oopDesc::is_oop(obj), "must be a valid oop");
988 assert(obj->klass()->has_finalizer(), "shouldn't be here otherwise");
989 InstanceKlass::register_finalizer(instanceOop(obj), CHECK);
990 JRT_END
991
992
993 jlong SharedRuntime::get_java_tid(Thread* thread) {
994 if (thread != NULL) {
995 if (thread->is_Java_thread()) {
996 oop obj = JavaThread::cast(thread)->threadObj();
997 return (obj == NULL) ? 0 : java_lang_Thread::thread_id(obj);
998 }
999 }
1000 return 0;
1001 }
1002
1003 /**
1004 * This function ought to be a void function, but cannot be because
1005 * it gets turned into a tail-call on sparc, which runs into dtrace bug
1006 * 6254741. Once that is fixed we can remove the dummy return value.
1007 */
1008 int SharedRuntime::dtrace_object_alloc(oopDesc* o) {
1009 return dtrace_object_alloc(Thread::current(), o, o->size());
1010 }
1011
1012 int SharedRuntime::dtrace_object_alloc(Thread* thread, oopDesc* o) {
1077 return caller->attached_method_before_pc(pc);
1078 }
1079 return NULL;
1080 }
1081
1082 // Finds receiver, CallInfo (i.e. receiver method), and calling bytecode
1083 // for a call current in progress, i.e., arguments has been pushed on stack
1084 // but callee has not been invoked yet. Caller frame must be compiled.
1085 Handle SharedRuntime::find_callee_info_helper(vframeStream& vfst, Bytecodes::Code& bc,
1086 CallInfo& callinfo, TRAPS) {
1087 Handle receiver;
1088 Handle nullHandle; // create a handy null handle for exception returns
1089 JavaThread* current = THREAD;
1090
1091 assert(!vfst.at_end(), "Java frame must exist");
1092
1093 // Find caller and bci from vframe
1094 methodHandle caller(current, vfst.method());
1095 int bci = vfst.bci();
1096
1097 // Substitutability test implementation piggy backs on static call resolution
1098 Bytecodes::Code code = caller->java_code_at(bci);
1099 if (code == Bytecodes::_if_acmpeq || code == Bytecodes::_if_acmpne) {
1100 bc = Bytecodes::_invokestatic;
1101 methodHandle attached_method(THREAD, extract_attached_method(vfst));
1102 assert(attached_method.not_null(), "must have attached method");
1103 vmClasses::PrimitiveObjectMethods_klass()->initialize(CHECK_NH);
1104 LinkResolver::resolve_invoke(callinfo, receiver, attached_method, bc, false, CHECK_NH);
1105 #ifdef ASSERT
1106 Method* is_subst = vmClasses::PrimitiveObjectMethods_klass()->find_method(vmSymbols::isSubstitutable_name(), vmSymbols::object_object_boolean_signature());
1107 assert(callinfo.selected_method() == is_subst, "must be isSubstitutable method");
1108 #endif
1109 return receiver;
1110 }
1111
1112 Bytecode_invoke bytecode(caller, bci);
1113 int bytecode_index = bytecode.index();
1114 bc = bytecode.invoke_code();
1115
1116 methodHandle attached_method(current, extract_attached_method(vfst));
1117 if (attached_method.not_null()) {
1118 Method* callee = bytecode.static_target(CHECK_NH);
1119 vmIntrinsics::ID id = callee->intrinsic_id();
1120 // When VM replaces MH.invokeBasic/linkTo* call with a direct/virtual call,
1121 // it attaches statically resolved method to the call site.
1122 if (MethodHandles::is_signature_polymorphic(id) &&
1123 MethodHandles::is_signature_polymorphic_intrinsic(id)) {
1124 bc = MethodHandles::signature_polymorphic_intrinsic_bytecode(id);
1125
1126 // Adjust invocation mode according to the attached method.
1127 switch (bc) {
1128 case Bytecodes::_invokevirtual:
1129 if (attached_method->method_holder()->is_interface()) {
1130 bc = Bytecodes::_invokeinterface;
1131 }
1132 break;
1133 case Bytecodes::_invokeinterface:
1134 if (!attached_method->method_holder()->is_interface()) {
1135 bc = Bytecodes::_invokevirtual;
1136 }
1137 break;
1138 case Bytecodes::_invokehandle:
1139 if (!MethodHandles::is_signature_polymorphic_method(attached_method())) {
1140 bc = attached_method->is_static() ? Bytecodes::_invokestatic
1141 : Bytecodes::_invokevirtual;
1142 }
1143 break;
1144 default:
1145 break;
1146 }
1147 } else {
1148 assert(attached_method->has_scalarized_args(), "invalid use of attached method");
1149 if (!attached_method->method_holder()->is_inline_klass()) {
1150 // Ignore the attached method in this case to not confuse below code
1151 attached_method = methodHandle(current, NULL);
1152 }
1153 }
1154 }
1155
1156 assert(bc != Bytecodes::_illegal, "not initialized");
1157
1158 bool has_receiver = bc != Bytecodes::_invokestatic &&
1159 bc != Bytecodes::_invokedynamic &&
1160 bc != Bytecodes::_invokehandle;
1161 bool check_null_and_abstract = true;
1162
1163 // Find receiver for non-static call
1164 if (has_receiver) {
1165 // This register map must be update since we need to find the receiver for
1166 // compiled frames. The receiver might be in a register.
1167 RegisterMap reg_map2(current);
1168 frame stubFrame = current->last_frame();
1169 // Caller-frame is a compiled frame
1170 frame callerFrame = stubFrame.sender(®_map2);
1171 bool caller_is_c1 = false;
1172
1173 if (callerFrame.is_compiled_frame() && !callerFrame.is_deoptimized_frame()) {
1174 caller_is_c1 = callerFrame.cb()->is_compiled_by_c1();
1175 }
1176
1177 Method* callee = attached_method();
1178 if (callee == NULL) {
1179 callee = bytecode.static_target(CHECK_NH);
1180 if (callee == NULL) {
1181 THROW_(vmSymbols::java_lang_NoSuchMethodException(), nullHandle);
1182 }
1183 }
1184 if (!caller_is_c1 && callee->is_scalarized_arg(0)) {
1185 // If the receiver is an inline type that is passed as fields, no oop is available
1186 // Resolve the call without receiver null checking.
1187 assert(attached_method.not_null() && !attached_method->is_abstract(), "must have non-abstract attached method");
1188 if (bc == Bytecodes::_invokeinterface) {
1189 bc = Bytecodes::_invokevirtual; // C2 optimistically replaces interface calls by virtual calls
1190 }
1191 check_null_and_abstract = false;
1192 } else {
1193 // Retrieve from a compiled argument list
1194 receiver = Handle(current, callerFrame.retrieve_receiver(®_map2));
1195 if (receiver.is_null()) {
1196 THROW_(vmSymbols::java_lang_NullPointerException(), nullHandle);
1197 }
1198 }
1199 }
1200
1201 // Resolve method
1202 if (attached_method.not_null()) {
1203 // Parameterized by attached method.
1204 LinkResolver::resolve_invoke(callinfo, receiver, attached_method, bc, check_null_and_abstract, CHECK_NH);
1205 } else {
1206 // Parameterized by bytecode.
1207 constantPoolHandle constants(current, caller->constants());
1208 LinkResolver::resolve_invoke(callinfo, receiver, constants, bytecode_index, bc, CHECK_NH);
1209 }
1210
1211 #ifdef ASSERT
1212 // Check that the receiver klass is of the right subtype and that it is initialized for virtual calls
1213 if (has_receiver && check_null_and_abstract) {
1214 assert(receiver.not_null(), "should have thrown exception");
1215 Klass* receiver_klass = receiver->klass();
1216 Klass* rk = NULL;
1217 if (attached_method.not_null()) {
1218 // In case there's resolved method attached, use its holder during the check.
1219 rk = attached_method->method_holder();
1220 } else {
1221 // Klass is already loaded.
1222 constantPoolHandle constants(current, caller->constants());
1223 rk = constants->klass_ref_at(bytecode_index, CHECK_NH);
1224 }
1225 Klass* static_receiver_klass = rk;
1226 assert(receiver_klass->is_subtype_of(static_receiver_klass),
1227 "actual receiver must be subclass of static receiver klass");
1228 if (receiver_klass->is_instance_klass()) {
1229 if (InstanceKlass::cast(receiver_klass)->is_not_initialized()) {
1230 tty->print_cr("ERROR: Klass not yet initialized!!");
1231 receiver_klass->print();
1232 }
1233 assert(!InstanceKlass::cast(receiver_klass)->is_not_initialized(), "receiver_klass must be initialized");
1251 // Hence the stack can only contain an entry_frame. We need to
1252 // find the target method from the stub frame.
1253 RegisterMap reg_map(current, false);
1254 frame fr = current->last_frame();
1255 assert(fr.is_runtime_frame(), "must be a runtimeStub");
1256 fr = fr.sender(®_map);
1257 assert(fr.is_entry_frame(), "must be");
1258 // fr is now pointing to the entry frame.
1259 callee_method = methodHandle(current, fr.entry_frame_call_wrapper()->callee_method());
1260 } else {
1261 Bytecodes::Code bc;
1262 CallInfo callinfo;
1263 find_callee_info_helper(vfst, bc, callinfo, CHECK_(methodHandle()));
1264 callee_method = methodHandle(current, callinfo.selected_method());
1265 }
1266 assert(callee_method()->is_method(), "must be");
1267 return callee_method;
1268 }
1269
1270 // Resolves a call.
1271 methodHandle SharedRuntime::resolve_helper(bool is_virtual, bool is_optimized, bool* caller_is_c1, TRAPS) {
1272 methodHandle callee_method;
1273 callee_method = resolve_sub_helper(is_virtual, is_optimized, caller_is_c1, THREAD);
1274 if (JvmtiExport::can_hotswap_or_post_breakpoint()) {
1275 int retry_count = 0;
1276 while (!HAS_PENDING_EXCEPTION && callee_method->is_old() &&
1277 callee_method->method_holder() != vmClasses::Object_klass()) {
1278 // If has a pending exception then there is no need to re-try to
1279 // resolve this method.
1280 // If the method has been redefined, we need to try again.
1281 // Hack: we have no way to update the vtables of arrays, so don't
1282 // require that java.lang.Object has been updated.
1283
1284 // It is very unlikely that method is redefined more than 100 times
1285 // in the middle of resolve. If it is looping here more than 100 times
1286 // means then there could be a bug here.
1287 guarantee((retry_count++ < 100),
1288 "Could not resolve to latest version of redefined method");
1289 // method is redefined in the middle of resolve so re-try.
1290 callee_method = resolve_sub_helper(is_virtual, is_optimized, caller_is_c1, THREAD);
1291 }
1292 }
1293 return callee_method;
1294 }
1295
1296 // This fails if resolution required refilling of IC stubs
1297 bool SharedRuntime::resolve_sub_helper_internal(methodHandle callee_method, const frame& caller_frame,
1298 CompiledMethod* caller_nm, bool is_virtual, bool is_optimized,
1299 Handle receiver, CallInfo& call_info, Bytecodes::Code invoke_code, TRAPS) {
1300 StaticCallInfo static_call_info;
1301 CompiledICInfo virtual_call_info;
1302
1303 // Make sure the callee nmethod does not get deoptimized and removed before
1304 // we are done patching the code.
1305 CompiledMethod* callee = callee_method->code();
1306
1307 if (callee != NULL) {
1308 assert(callee->is_compiled(), "must be nmethod for patching");
1309 }
1310
1311 if (callee != NULL && !callee->is_in_use()) {
1312 // Patch call site to C2I adapter if callee nmethod is deoptimized or unloaded.
1313 callee = NULL;
1314 }
1315 nmethodLocker nl_callee(callee);
1316 #ifdef ASSERT
1317 address dest_entry_point = callee == NULL ? 0 : callee->entry_point(); // used below
1318 #endif
1319
1320 bool is_nmethod = caller_nm->is_nmethod();
1321 bool caller_is_c1 = caller_nm->is_compiled_by_c1();
1322
1323 if (is_virtual) {
1324 Klass* receiver_klass = NULL;
1325 if (!caller_is_c1 && callee_method->is_scalarized_arg(0)) {
1326 // If the receiver is an inline type that is passed as fields, no oop is available
1327 receiver_klass = callee_method->method_holder();
1328 } else {
1329 assert(receiver.not_null() || invoke_code == Bytecodes::_invokehandle, "sanity check");
1330 receiver_klass = invoke_code == Bytecodes::_invokehandle ? NULL : receiver->klass();
1331 }
1332 bool static_bound = call_info.resolved_method()->can_be_statically_bound();
1333 CompiledIC::compute_monomorphic_entry(callee_method, receiver_klass,
1334 is_optimized, static_bound, is_nmethod, caller_is_c1, virtual_call_info,
1335 CHECK_false);
1336 } else {
1337 // static call
1338 CompiledStaticCall::compute_entry(callee_method, caller_nm, static_call_info);
1339 }
1340
1341 // grab lock, check for deoptimization and potentially patch caller
1342 {
1343 CompiledICLocker ml(caller_nm);
1344
1345 // Lock blocks for safepoint during which both nmethods can change state.
1346
1347 // Now that we are ready to patch if the Method* was redefined then
1348 // don't update call site and let the caller retry.
1349 // Don't update call site if callee nmethod was unloaded or deoptimized.
1350 // Don't update call site if callee nmethod was replaced by an other nmethod
1351 // which may happen when multiply alive nmethod (tiered compilation)
1352 // will be supported.
1353 if (!callee_method->is_old() &&
1354 (callee == NULL || (callee->is_in_use() && callee_method->code() == callee))) {
1355 NoSafepointVerifier nsv;
1356 #ifdef ASSERT
1357 // We must not try to patch to jump to an already unloaded method.
1358 if (dest_entry_point != 0) {
1368 return false;
1369 }
1370 }
1371 } else {
1372 if (VM_Version::supports_fast_class_init_checks() &&
1373 invoke_code == Bytecodes::_invokestatic &&
1374 callee_method->needs_clinit_barrier() &&
1375 callee != NULL && callee->is_compiled_by_jvmci()) {
1376 return true; // skip patching for JVMCI
1377 }
1378 CompiledStaticCall* ssc = caller_nm->compiledStaticCall_before(caller_frame.pc());
1379 if (ssc->is_clean()) ssc->set(static_call_info);
1380 }
1381 }
1382 } // unlock CompiledICLocker
1383 return true;
1384 }
1385
1386 // Resolves a call. The compilers generate code for calls that go here
1387 // and are patched with the real destination of the call.
1388 methodHandle SharedRuntime::resolve_sub_helper(bool is_virtual, bool is_optimized, bool* caller_is_c1, TRAPS) {
1389 JavaThread* current = THREAD;
1390 ResourceMark rm(current);
1391 RegisterMap cbl_map(current, false);
1392 frame caller_frame = current->last_frame().sender(&cbl_map);
1393
1394 CodeBlob* caller_cb = caller_frame.cb();
1395 guarantee(caller_cb != NULL && caller_cb->is_compiled(), "must be called from compiled method");
1396 CompiledMethod* caller_nm = caller_cb->as_compiled_method_or_null();
1397 *caller_is_c1 = caller_nm->is_compiled_by_c1();
1398
1399 // make sure caller is not getting deoptimized
1400 // and removed before we are done with it.
1401 // CLEANUP - with lazy deopt shouldn't need this lock
1402 nmethodLocker caller_lock(caller_nm);
1403
1404 // determine call info & receiver
1405 // note: a) receiver is NULL for static calls
1406 // b) an exception is thrown if receiver is NULL for non-static calls
1407 CallInfo call_info;
1408 Bytecodes::Code invoke_code = Bytecodes::_illegal;
1409 Handle receiver = find_callee_info(invoke_code, call_info, CHECK_(methodHandle()));
1410 methodHandle callee_method(current, call_info.selected_method());
1411
1412 assert((!is_virtual && invoke_code == Bytecodes::_invokestatic ) ||
1413 (!is_virtual && invoke_code == Bytecodes::_invokespecial) ||
1414 (!is_virtual && invoke_code == Bytecodes::_invokehandle ) ||
1415 (!is_virtual && invoke_code == Bytecodes::_invokedynamic) ||
1416 ( is_virtual && invoke_code != Bytecodes::_invokestatic ), "inconsistent bytecode");
1417
1474 bool successful = resolve_sub_helper_internal(callee_method, caller_frame, caller_nm,
1475 is_virtual, is_optimized, receiver,
1476 call_info, invoke_code, CHECK_(methodHandle()));
1477 if (successful) {
1478 return callee_method;
1479 } else {
1480 InlineCacheBuffer::refill_ic_stubs();
1481 }
1482 }
1483
1484 }
1485
1486
1487 // Inline caches exist only in compiled code
1488 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_ic_miss(JavaThread* current))
1489 #ifdef ASSERT
1490 RegisterMap reg_map(current, false);
1491 frame stub_frame = current->last_frame();
1492 assert(stub_frame.is_runtime_frame(), "sanity check");
1493 frame caller_frame = stub_frame.sender(®_map);
1494 assert(!caller_frame.is_interpreted_frame() && !caller_frame.is_entry_frame() && !caller_frame.is_optimized_entry_frame(), "unexpected frame");
1495 #endif /* ASSERT */
1496
1497 methodHandle callee_method;
1498 bool is_optimized = false;
1499 bool caller_is_c1 = false;
1500 JRT_BLOCK
1501 callee_method = SharedRuntime::handle_ic_miss_helper(is_optimized, caller_is_c1, CHECK_NULL);
1502 // Return Method* through TLS
1503 current->set_vm_result_2(callee_method());
1504 JRT_BLOCK_END
1505 // return compiled code entry point after potential safepoints
1506 return entry_for_handle_wrong_method(callee_method, false, is_optimized, caller_is_c1);
1507 JRT_END
1508
1509
1510 // Handle call site that has been made non-entrant
1511 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method(JavaThread* current))
1512 // 6243940 We might end up in here if the callee is deoptimized
1513 // as we race to call it. We don't want to take a safepoint if
1514 // the caller was interpreted because the caller frame will look
1515 // interpreted to the stack walkers and arguments are now
1516 // "compiled" so it is much better to make this transition
1517 // invisible to the stack walking code. The i2c path will
1518 // place the callee method in the callee_target. It is stashed
1519 // there because if we try and find the callee by normal means a
1520 // safepoint is possible and have trouble gc'ing the compiled args.
1521 RegisterMap reg_map(current, false);
1522 frame stub_frame = current->last_frame();
1523 assert(stub_frame.is_runtime_frame(), "sanity check");
1524 frame caller_frame = stub_frame.sender(®_map);
1525
1526 if (caller_frame.is_interpreted_frame() ||
1530 guarantee(callee != NULL && callee->is_method(), "bad handshake");
1531 current->set_vm_result_2(callee);
1532 current->set_callee_target(NULL);
1533 if (caller_frame.is_entry_frame() && VM_Version::supports_fast_class_init_checks()) {
1534 // Bypass class initialization checks in c2i when caller is in native.
1535 // JNI calls to static methods don't have class initialization checks.
1536 // Fast class initialization checks are present in c2i adapters and call into
1537 // SharedRuntime::handle_wrong_method() on the slow path.
1538 //
1539 // JVM upcalls may land here as well, but there's a proper check present in
1540 // LinkResolver::resolve_static_call (called from JavaCalls::call_static),
1541 // so bypassing it in c2i adapter is benign.
1542 return callee->get_c2i_no_clinit_check_entry();
1543 } else {
1544 return callee->get_c2i_entry();
1545 }
1546 }
1547
1548 // Must be compiled to compiled path which is safe to stackwalk
1549 methodHandle callee_method;
1550 bool is_static_call = false;
1551 bool is_optimized = false;
1552 bool caller_is_c1 = false;
1553 JRT_BLOCK
1554 // Force resolving of caller (if we called from compiled frame)
1555 callee_method = SharedRuntime::reresolve_call_site(is_static_call, is_optimized, caller_is_c1, CHECK_NULL);
1556 current->set_vm_result_2(callee_method());
1557 JRT_BLOCK_END
1558 // return compiled code entry point after potential safepoints
1559 return entry_for_handle_wrong_method(callee_method, is_static_call, is_optimized, caller_is_c1);
1560 JRT_END
1561
1562 // Handle abstract method call
1563 JRT_BLOCK_ENTRY(address, SharedRuntime::handle_wrong_method_abstract(JavaThread* current))
1564 // Verbose error message for AbstractMethodError.
1565 // Get the called method from the invoke bytecode.
1566 vframeStream vfst(current, true);
1567 assert(!vfst.at_end(), "Java frame must exist");
1568 methodHandle caller(current, vfst.method());
1569 Bytecode_invoke invoke(caller, vfst.bci());
1570 DEBUG_ONLY( invoke.verify(); )
1571
1572 // Find the compiled caller frame.
1573 RegisterMap reg_map(current);
1574 frame stubFrame = current->last_frame();
1575 assert(stubFrame.is_runtime_frame(), "must be");
1576 frame callerFrame = stubFrame.sender(®_map);
1577 assert(callerFrame.is_compiled_frame(), "must be");
1578
1579 // Install exception and return forward entry.
1580 address res = StubRoutines::throw_AbstractMethodError_entry();
1581 JRT_BLOCK
1582 methodHandle callee(current, invoke.static_target(current));
1583 if (!callee.is_null()) {
1584 oop recv = callerFrame.retrieve_receiver(®_map);
1585 Klass *recv_klass = (recv != NULL) ? recv->klass() : NULL;
1586 res = StubRoutines::forward_exception_entry();
1587 LinkResolver::throw_abstract_method_error(callee, recv_klass, CHECK_(res));
1588 }
1589 JRT_BLOCK_END
1590 return res;
1591 JRT_END
1592
1593
1594 // resolve a static call and patch code
1595 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_static_call_C(JavaThread* current ))
1596 methodHandle callee_method;
1597 bool caller_is_c1;
1598 JRT_BLOCK
1599 callee_method = SharedRuntime::resolve_helper(false, false, &caller_is_c1, CHECK_NULL);
1600 current->set_vm_result_2(callee_method());
1601 JRT_BLOCK_END
1602 // return compiled code entry point after potential safepoints
1603 address entry = caller_is_c1 ?
1604 callee_method->verified_inline_code_entry() : callee_method->verified_code_entry();
1605 assert(entry != NULL, "Jump to zero!");
1606 return entry;
1607 JRT_END
1608
1609
1610 // resolve virtual call and update inline cache to monomorphic
1611 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_virtual_call_C(JavaThread* current))
1612 methodHandle callee_method;
1613 bool caller_is_c1;
1614 JRT_BLOCK
1615 callee_method = SharedRuntime::resolve_helper(true, false, &caller_is_c1, CHECK_NULL);
1616 current->set_vm_result_2(callee_method());
1617 JRT_BLOCK_END
1618 // return compiled code entry point after potential safepoints
1619 address entry = caller_is_c1 ?
1620 callee_method->verified_inline_code_entry() : callee_method->verified_inline_ro_code_entry();
1621 assert(entry != NULL, "Jump to zero!");
1622 return entry;
1623 JRT_END
1624
1625
1626 // Resolve a virtual call that can be statically bound (e.g., always
1627 // monomorphic, so it has no inline cache). Patch code to resolved target.
1628 JRT_BLOCK_ENTRY(address, SharedRuntime::resolve_opt_virtual_call_C(JavaThread* current))
1629 methodHandle callee_method;
1630 bool caller_is_c1;
1631 JRT_BLOCK
1632 callee_method = SharedRuntime::resolve_helper(true, true, &caller_is_c1, CHECK_NULL);
1633 current->set_vm_result_2(callee_method());
1634 JRT_BLOCK_END
1635 // return compiled code entry point after potential safepoints
1636 address entry = caller_is_c1 ?
1637 callee_method->verified_inline_code_entry() : callee_method->verified_code_entry();
1638 assert(entry != NULL, "Jump to zero!");
1639 return entry;
1640 JRT_END
1641
1642 // The handle_ic_miss_helper_internal function returns false if it failed due
1643 // to either running out of vtable stubs or ic stubs due to IC transitions
1644 // to transitional states. The needs_ic_stub_refill value will be set if
1645 // the failure was due to running out of IC stubs, in which case handle_ic_miss_helper
1646 // refills the IC stubs and tries again.
1647 bool SharedRuntime::handle_ic_miss_helper_internal(Handle receiver, CompiledMethod* caller_nm,
1648 const frame& caller_frame, methodHandle callee_method,
1649 Bytecodes::Code bc, CallInfo& call_info,
1650 bool& needs_ic_stub_refill, bool& is_optimized, bool caller_is_c1, TRAPS) {
1651 CompiledICLocker ml(caller_nm);
1652 CompiledIC* inline_cache = CompiledIC_before(caller_nm, caller_frame.pc());
1653 bool should_be_mono = false;
1654 if (inline_cache->is_optimized()) {
1655 if (TraceCallFixup) {
1656 ResourceMark rm(THREAD);
1657 tty->print("OPTIMIZED IC miss (%s) call to", Bytecodes::name(bc));
1658 callee_method->print_short_name(tty);
1659 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1660 }
1661 is_optimized = true;
1662 should_be_mono = true;
1663 } else if (inline_cache->is_icholder_call()) {
1664 CompiledICHolder* ic_oop = inline_cache->cached_icholder();
1665 if (ic_oop != NULL) {
1666 if (!ic_oop->is_loader_alive()) {
1667 // Deferred IC cleaning due to concurrent class unloading
1668 if (!inline_cache->set_to_clean()) {
1669 needs_ic_stub_refill = true;
1670 return false;
1671 }
1672 } else if (receiver()->klass() == ic_oop->holder_klass()) {
1673 // This isn't a real miss. We must have seen that compiled code
1674 // is now available and we want the call site converted to a
1675 // monomorphic compiled call site.
1676 // We can't assert for callee_method->code() != NULL because it
1677 // could have been deoptimized in the meantime
1678 if (TraceCallFixup) {
1679 ResourceMark rm(THREAD);
1680 tty->print("FALSE IC miss (%s) converting to compiled call to", Bytecodes::name(bc));
1681 callee_method->print_short_name(tty);
1682 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1683 }
1684 should_be_mono = true;
1685 }
1686 }
1687 }
1688
1689 if (should_be_mono) {
1690 // We have a path that was monomorphic but was going interpreted
1691 // and now we have (or had) a compiled entry. We correct the IC
1692 // by using a new icBuffer.
1693 CompiledICInfo info;
1694 Klass* receiver_klass = receiver()->klass();
1695 inline_cache->compute_monomorphic_entry(callee_method,
1696 receiver_klass,
1697 inline_cache->is_optimized(),
1698 false, caller_nm->is_nmethod(),
1699 caller_nm->is_compiled_by_c1(),
1700 info, CHECK_false);
1701 if (!inline_cache->set_to_monomorphic(info)) {
1702 needs_ic_stub_refill = true;
1703 return false;
1704 }
1705 } else if (!inline_cache->is_megamorphic() && !inline_cache->is_clean()) {
1706 // Potential change to megamorphic
1707
1708 bool successful = inline_cache->set_to_megamorphic(&call_info, bc, needs_ic_stub_refill, caller_is_c1, CHECK_false);
1709 if (needs_ic_stub_refill) {
1710 return false;
1711 }
1712 if (!successful) {
1713 if (!inline_cache->set_to_clean()) {
1714 needs_ic_stub_refill = true;
1715 return false;
1716 }
1717 }
1718 } else {
1719 // Either clean or megamorphic
1720 }
1721 return true;
1722 }
1723
1724 methodHandle SharedRuntime::handle_ic_miss_helper(bool& is_optimized, bool& caller_is_c1, TRAPS) {
1725 JavaThread* current = THREAD;
1726 ResourceMark rm(current);
1727 CallInfo call_info;
1728 Bytecodes::Code bc;
1729
1730 // receiver is NULL for static calls. An exception is thrown for NULL
1731 // receivers for non-static calls
1732 Handle receiver = find_callee_info(bc, call_info, CHECK_(methodHandle()));
1733 // Compiler1 can produce virtual call sites that can actually be statically bound
1734 // If we fell thru to below we would think that the site was going megamorphic
1735 // when in fact the site can never miss. Worse because we'd think it was megamorphic
1736 // we'd try and do a vtable dispatch however methods that can be statically bound
1737 // don't have vtable entries (vtable_index < 0) and we'd blow up. So we force a
1738 // reresolution of the call site (as if we did a handle_wrong_method and not an
1739 // plain ic_miss) and the site will be converted to an optimized virtual call site
1740 // never to miss again. I don't believe C2 will produce code like this but if it
1741 // did this would still be the correct thing to do for it too, hence no ifdef.
1742 //
1743 if (call_info.resolved_method()->can_be_statically_bound()) {
1744 bool is_static_call = false;
1745 methodHandle callee_method = SharedRuntime::reresolve_call_site(is_static_call, is_optimized, caller_is_c1, CHECK_(methodHandle()));
1746 assert(!is_static_call, "IC miss at static call?");
1747 if (TraceCallFixup) {
1748 RegisterMap reg_map(current, false);
1749 frame caller_frame = current->last_frame().sender(®_map);
1750 ResourceMark rm(current);
1751 tty->print("converting IC miss to reresolve (%s) call to", Bytecodes::name(bc));
1752 callee_method->print_short_name(tty);
1753 tty->print_cr(" from pc: " INTPTR_FORMAT, p2i(caller_frame.pc()));
1754 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1755 }
1756 return callee_method;
1757 }
1758
1759 methodHandle callee_method(current, call_info.selected_method());
1760
1761 #ifndef PRODUCT
1762 Atomic::inc(&_ic_miss_ctr);
1763
1764 // Statistics & Tracing
1765 if (TraceCallFixup) {
1766 ResourceMark rm(current);
1776 // produce statistics under the lock
1777 trace_ic_miss(f.pc());
1778 }
1779 #endif
1780
1781 // install an event collector so that when a vtable stub is created the
1782 // profiler can be notified via a DYNAMIC_CODE_GENERATED event. The
1783 // event can't be posted when the stub is created as locks are held
1784 // - instead the event will be deferred until the event collector goes
1785 // out of scope.
1786 JvmtiDynamicCodeEventCollector event_collector;
1787
1788 // Update inline cache to megamorphic. Skip update if we are called from interpreted.
1789 // Transitioning IC caches may require transition stubs. If we run out
1790 // of transition stubs, we have to drop locks and perform a safepoint
1791 // that refills them.
1792 RegisterMap reg_map(current, false);
1793 frame caller_frame = current->last_frame().sender(®_map);
1794 CodeBlob* cb = caller_frame.cb();
1795 CompiledMethod* caller_nm = cb->as_compiled_method();
1796 caller_is_c1 = caller_nm->is_compiled_by_c1();
1797
1798 for (;;) {
1799 ICRefillVerifier ic_refill_verifier;
1800 bool needs_ic_stub_refill = false;
1801 bool successful = handle_ic_miss_helper_internal(receiver, caller_nm, caller_frame, callee_method,
1802 bc, call_info, needs_ic_stub_refill, is_optimized, caller_is_c1, CHECK_(methodHandle()));
1803 if (successful || !needs_ic_stub_refill) {
1804 return callee_method;
1805 } else {
1806 InlineCacheBuffer::refill_ic_stubs();
1807 }
1808 }
1809 }
1810
1811 static bool clear_ic_at_addr(CompiledMethod* caller_nm, address call_addr, bool is_static_call) {
1812 CompiledICLocker ml(caller_nm);
1813 if (is_static_call) {
1814 CompiledStaticCall* ssc = caller_nm->compiledStaticCall_at(call_addr);
1815 if (!ssc->is_clean()) {
1816 return ssc->set_to_clean();
1817 }
1818 } else {
1819 // compiled, dispatched call (which used to call an interpreted method)
1820 CompiledIC* inline_cache = CompiledIC_at(caller_nm, call_addr);
1821 if (!inline_cache->is_clean()) {
1822 return inline_cache->set_to_clean();
1823 }
1824 }
1825 return true;
1826 }
1827
1828 //
1829 // Resets a call-site in compiled code so it will get resolved again.
1830 // This routines handles both virtual call sites, optimized virtual call
1831 // sites, and static call sites. Typically used to change a call sites
1832 // destination from compiled to interpreted.
1833 //
1834 methodHandle SharedRuntime::reresolve_call_site(bool& is_static_call, bool& is_optimized, bool& caller_is_c1, TRAPS) {
1835 JavaThread* current = THREAD;
1836 ResourceMark rm(current);
1837 RegisterMap reg_map(current, false);
1838 frame stub_frame = current->last_frame();
1839 assert(stub_frame.is_runtime_frame(), "must be a runtimeStub");
1840 frame caller = stub_frame.sender(®_map);
1841
1842 // Do nothing if the frame isn't a live compiled frame.
1843 // nmethod could be deoptimized by the time we get here
1844 // so no update to the caller is needed.
1845
1846 if (caller.is_compiled_frame() && !caller.is_deoptimized_frame()) {
1847
1848 address pc = caller.pc();
1849
1850 // Check for static or virtual call
1851 CompiledMethod* caller_nm = CodeCache::find_compiled(pc);
1852 caller_is_c1 = caller_nm->is_compiled_by_c1();
1853
1854 // Default call_addr is the location of the "basic" call.
1855 // Determine the address of the call we a reresolving. With
1856 // Inline Caches we will always find a recognizable call.
1857 // With Inline Caches disabled we may or may not find a
1858 // recognizable call. We will always find a call for static
1859 // calls and for optimized virtual calls. For vanilla virtual
1860 // calls it depends on the state of the UseInlineCaches switch.
1861 //
1862 // With Inline Caches disabled we can get here for a virtual call
1863 // for two reasons:
1864 // 1 - calling an abstract method. The vtable for abstract methods
1865 // will run us thru handle_wrong_method and we will eventually
1866 // end up in the interpreter to throw the ame.
1867 // 2 - a racing deoptimization. We could be doing a vanilla vtable
1868 // call and between the time we fetch the entry address and
1869 // we jump to it the target gets deoptimized. Similar to 1
1870 // we will wind up in the interprter (thru a c2i with c2).
1871 //
1872 address call_addr = NULL;
1876 CompiledICLocker ml(caller_nm);
1877 // Location of call instruction
1878 call_addr = caller_nm->call_instruction_address(pc);
1879 }
1880 // Make sure nmethod doesn't get deoptimized and removed until
1881 // this is done with it.
1882 // CLEANUP - with lazy deopt shouldn't need this lock
1883 nmethodLocker nmlock(caller_nm);
1884
1885 if (call_addr != NULL) {
1886 RelocIterator iter(caller_nm, call_addr, call_addr+1);
1887 int ret = iter.next(); // Get item
1888 if (ret) {
1889 assert(iter.addr() == call_addr, "must find call");
1890 if (iter.type() == relocInfo::static_call_type) {
1891 is_static_call = true;
1892 } else {
1893 assert(iter.type() == relocInfo::virtual_call_type ||
1894 iter.type() == relocInfo::opt_virtual_call_type
1895 , "unexpected relocInfo. type");
1896 is_optimized = (iter.type() == relocInfo::opt_virtual_call_type);
1897 }
1898 } else {
1899 assert(!UseInlineCaches, "relocation info. must exist for this address");
1900 }
1901
1902 // Cleaning the inline cache will force a new resolve. This is more robust
1903 // than directly setting it to the new destination, since resolving of calls
1904 // is always done through the same code path. (experience shows that it
1905 // leads to very hard to track down bugs, if an inline cache gets updated
1906 // to a wrong method). It should not be performance critical, since the
1907 // resolve is only done once.
1908
1909 for (;;) {
1910 ICRefillVerifier ic_refill_verifier;
1911 if (!clear_ic_at_addr(caller_nm, call_addr, is_static_call)) {
1912 InlineCacheBuffer::refill_ic_stubs();
1913 } else {
1914 break;
1915 }
1916 }
1917 }
1918 }
1919
1920 methodHandle callee_method = find_callee_method(CHECK_(methodHandle()));
1921
1922 #ifndef PRODUCT
1923 Atomic::inc(&_wrong_method_ctr);
1924
1925 if (TraceCallFixup) {
1926 ResourceMark rm(current);
1927 tty->print("handle_wrong_method reresolving call to");
1928 callee_method->print_short_name(tty);
1929 tty->print_cr(" code: " INTPTR_FORMAT, p2i(callee_method->code()));
1930 }
1931 #endif
1932
1933 return callee_method;
1934 }
1935
1936 address SharedRuntime::handle_unsafe_access(JavaThread* thread, address next_pc) {
1937 // The faulting unsafe accesses should be changed to throw the error
1938 // synchronously instead. Meanwhile the faulting instruction will be
1939 // skipped over (effectively turning it into a no-op) and an
1940 // asynchronous exception will be raised which the thread will
1941 // handle at a later point. If the instruction is a load it will
1997 if (TraceCallFixup) {
1998 tty->print("already patched callsite at " INTPTR_FORMAT " to compiled code for", p2i(caller_pc));
1999 moop->print_short_name(tty);
2000 tty->print_cr(" to " INTPTR_FORMAT, p2i(entry_point));
2001 }
2002 }
2003 return false;
2004 }
2005
2006 // ---------------------------------------------------------------------------
2007 // We are calling the interpreter via a c2i. Normally this would mean that
2008 // we were called by a compiled method. However we could have lost a race
2009 // where we went int -> i2c -> c2i and so the caller could in fact be
2010 // interpreted. If the caller is compiled we attempt to patch the caller
2011 // so he no longer calls into the interpreter.
2012 JRT_LEAF(void, SharedRuntime::fixup_callers_callsite(Method* method, address caller_pc))
2013 Method* moop(method);
2014
2015 AARCH64_PORT_ONLY(assert(pauth_ptr_is_raw(caller_pc), "should be raw"));
2016
2017 // It's possible that deoptimization can occur at a call site which hasn't
2018 // been resolved yet, in which case this function will be called from
2019 // an nmethod that has been patched for deopt and we can ignore the
2020 // request for a fixup.
2021 // Also it is possible that we lost a race in that from_compiled_entry
2022 // is now back to the i2c in that case we don't need to patch and if
2023 // we did we'd leap into space because the callsite needs to use
2024 // "to interpreter" stub in order to load up the Method*. Don't
2025 // ask me how I know this...
2026
2027 CodeBlob* cb = CodeCache::find_blob(caller_pc);
2028 if (cb == NULL || !cb->is_compiled()) {
2029 return;
2030 }
2031 address entry_point = moop->from_compiled_entry_no_trampoline(cb->is_compiled_by_c1());
2032 if (entry_point == moop->get_c2i_entry()) {
2033 return;
2034 }
2035
2036 // The check above makes sure this is a nmethod.
2037 CompiledMethod* nm = cb->as_compiled_method_or_null();
2038 assert(nm, "must be");
2039
2040 // Get the return PC for the passed caller PC.
2041 address return_pc = caller_pc + frame::pc_return_offset;
2042
2043 // There is a benign race here. We could be attempting to patch to a compiled
2044 // entry point at the same time the callee is being deoptimized. If that is
2045 // the case then entry_point may in fact point to a c2i and we'd patch the
2046 // call site with the same old data. clear_code will set code() to NULL
2047 // at the end of it. If we happen to see that NULL then we can skip trying
2048 // to patch. If we hit the window where the callee has a c2i in the
2049 // from_compiled_entry and the NULL isn't present yet then we lose the race
2050 // and patch the code with the same old data. Asi es la vida.
2051
2052 if (moop->code() == NULL) return;
2387 private:
2388 enum {
2389 _basic_type_bits = 4,
2390 _basic_type_mask = right_n_bits(_basic_type_bits),
2391 _basic_types_per_int = BitsPerInt / _basic_type_bits,
2392 _compact_int_count = 3
2393 };
2394 // TO DO: Consider integrating this with a more global scheme for compressing signatures.
2395 // For now, 4 bits per components (plus T_VOID gaps after double/long) is not excessive.
2396
2397 union {
2398 int _compact[_compact_int_count];
2399 int* _fingerprint;
2400 } _value;
2401 int _length; // A negative length indicates the fingerprint is in the compact form,
2402 // Otherwise _value._fingerprint is the array.
2403
2404 // Remap BasicTypes that are handled equivalently by the adapters.
2405 // These are correct for the current system but someday it might be
2406 // necessary to make this mapping platform dependent.
2407 static BasicType adapter_encoding(BasicType in) {
2408 switch (in) {
2409 case T_BOOLEAN:
2410 case T_BYTE:
2411 case T_SHORT:
2412 case T_CHAR:
2413 // They are all promoted to T_INT in the calling convention
2414 return T_INT;
2415
2416 case T_OBJECT:
2417 case T_ARRAY:
2418 // In other words, we assume that any register good enough for
2419 // an int or long is good enough for a managed pointer.
2420 #ifdef _LP64
2421 return T_LONG;
2422 #else
2423 return T_INT;
2424 #endif
2425
2426 case T_INT:
2427 case T_LONG:
2428 case T_FLOAT:
2429 case T_DOUBLE:
2430 case T_VOID:
2431 return in;
2432
2433 default:
2434 ShouldNotReachHere();
2435 return T_CONFLICT;
2436 }
2437 }
2438
2439 public:
2440 AdapterFingerPrint(const GrowableArray<SigEntry>* sig, bool has_ro_adapter = false) {
2441 // The fingerprint is based on the BasicType signature encoded
2442 // into an array of ints with eight entries per int.
2443 int total_args_passed = (sig != NULL) ? sig->length() : 0;
2444 int* ptr;
2445 int len = (total_args_passed + (_basic_types_per_int-1)) / _basic_types_per_int;
2446 if (len <= _compact_int_count) {
2447 assert(_compact_int_count == 3, "else change next line");
2448 _value._compact[0] = _value._compact[1] = _value._compact[2] = 0;
2449 // Storing the signature encoded as signed chars hits about 98%
2450 // of the time.
2451 _length = -len;
2452 ptr = _value._compact;
2453 } else {
2454 _length = len;
2455 _value._fingerprint = NEW_C_HEAP_ARRAY(int, _length, mtCode);
2456 ptr = _value._fingerprint;
2457 }
2458
2459 // Now pack the BasicTypes with 8 per int
2460 int sig_index = 0;
2461 BasicType prev_bt = T_ILLEGAL;
2462 int vt_count = 0;
2463 for (int index = 0; index < len; index++) {
2464 int value = 0;
2465 for (int byte = 0; byte < _basic_types_per_int; byte++) {
2466 BasicType bt = T_ILLEGAL;
2467 if (sig_index < total_args_passed) {
2468 bt = sig->at(sig_index++)._bt;
2469 if (bt == T_PRIMITIVE_OBJECT) {
2470 // Found start of inline type in signature
2471 assert(InlineTypePassFieldsAsArgs, "unexpected start of inline type");
2472 if (sig_index == 1 && has_ro_adapter) {
2473 // With a ro_adapter, replace receiver inline type delimiter by T_VOID to prevent matching
2474 // with other adapters that have the same inline type as first argument and no receiver.
2475 bt = T_VOID;
2476 }
2477 vt_count++;
2478 } else if (bt == T_VOID && prev_bt != T_LONG && prev_bt != T_DOUBLE) {
2479 // Found end of inline type in signature
2480 assert(InlineTypePassFieldsAsArgs, "unexpected end of inline type");
2481 vt_count--;
2482 assert(vt_count >= 0, "invalid vt_count");
2483 } else if (vt_count == 0) {
2484 // Widen fields that are not part of a scalarized inline type argument
2485 bt = adapter_encoding(bt);
2486 }
2487 prev_bt = bt;
2488 }
2489 int bt_val = (bt == T_ILLEGAL) ? 0 : bt;
2490 assert((bt_val & _basic_type_mask) == bt_val, "must fit in 4 bits");
2491 value = (value << _basic_type_bits) | bt_val;
2492 }
2493 ptr[index] = value;
2494 }
2495 assert(vt_count == 0, "invalid vt_count");
2496 }
2497
2498 ~AdapterFingerPrint() {
2499 if (_length > 0) {
2500 FREE_C_HEAP_ARRAY(int, _value._fingerprint);
2501 }
2502 }
2503
2504 int value(int index) {
2505 if (_length < 0) {
2506 return _value._compact[index];
2507 }
2508 return _value._fingerprint[index];
2509 }
2510 int length() {
2511 if (_length < 0) return -_length;
2512 return _length;
2513 }
2514
2515 bool is_compact() {
2540 const char* as_basic_args_string() {
2541 stringStream st;
2542 bool long_prev = false;
2543 for (int i = 0; i < length(); i++) {
2544 unsigned val = (unsigned)value(i);
2545 // args are packed so that first/lower arguments are in the highest
2546 // bits of each int value, so iterate from highest to the lowest
2547 for (int j = 32 - _basic_type_bits; j >= 0; j -= _basic_type_bits) {
2548 unsigned v = (val >> j) & _basic_type_mask;
2549 if (v == 0) {
2550 assert(i == length() - 1, "Only expect zeroes in the last word");
2551 continue;
2552 }
2553 if (long_prev) {
2554 long_prev = false;
2555 if (v == T_VOID) {
2556 st.print("J");
2557 } else {
2558 st.print("L");
2559 }
2560 } else if (v == T_LONG) {
2561 long_prev = true;
2562 } else if (v != T_VOID){
2563 st.print("%c", type2char((BasicType)v));
2564 }
2565 }
2566 }
2567 if (long_prev) {
2568 st.print("L");
2569 }
2570 return st.as_string();
2571 }
2572 #endif // !product
2573
2574 bool equals(AdapterFingerPrint* other) {
2575 if (other->_length != _length) {
2576 return false;
2577 }
2578 if (_length < 0) {
2579 assert(_compact_int_count == 3, "else change next line");
2580 return _value._compact[0] == other->_value._compact[0] &&
2581 _value._compact[1] == other->_value._compact[1] &&
2582 _value._compact[2] == other->_value._compact[2];
2583 } else {
2598
2599 private:
2600
2601 #ifndef PRODUCT
2602 static int _lookups; // number of calls to lookup
2603 static int _buckets; // number of buckets checked
2604 static int _equals; // number of buckets checked with matching hash
2605 static int _hits; // number of successful lookups
2606 static int _compact; // number of equals calls with compact signature
2607 #endif
2608
2609 AdapterHandlerEntry* bucket(int i) {
2610 return (AdapterHandlerEntry*)BasicHashtable<mtCode>::bucket(i);
2611 }
2612
2613 public:
2614 AdapterHandlerTable()
2615 : BasicHashtable<mtCode>(293, (sizeof(AdapterHandlerEntry))) { }
2616
2617 // Create a new entry suitable for insertion in the table
2618 AdapterHandlerEntry* new_entry(AdapterFingerPrint* fingerprint, address i2c_entry, address c2i_entry,
2619 address c2i_inline_entry, address c2i_inline_ro_entry,
2620 address c2i_unverified_entry, address c2i_unverified_inline_entry, address c2i_no_clinit_check_entry) {
2621 AdapterHandlerEntry* entry = (AdapterHandlerEntry*)BasicHashtable<mtCode>::new_entry(fingerprint->compute_hash());
2622 entry->init(fingerprint, i2c_entry, c2i_entry, c2i_inline_entry, c2i_inline_ro_entry,
2623 c2i_unverified_entry, c2i_unverified_inline_entry, c2i_no_clinit_check_entry);
2624 return entry;
2625 }
2626
2627 // Insert an entry into the table
2628 void add(AdapterHandlerEntry* entry) {
2629 int index = hash_to_index(entry->hash());
2630 add_entry(index, entry);
2631 }
2632
2633 void free_entry(AdapterHandlerEntry* entry) {
2634 entry->deallocate();
2635 BasicHashtable<mtCode>::free_entry(entry);
2636 }
2637
2638 // Find a entry with the same fingerprint if it exists
2639 AdapterHandlerEntry* lookup(const GrowableArray<SigEntry>* sig, bool has_ro_adapter = false) {
2640 NOT_PRODUCT(_lookups++);
2641 AdapterFingerPrint fp(sig, has_ro_adapter);
2642 unsigned int hash = fp.compute_hash();
2643 int index = hash_to_index(hash);
2644 for (AdapterHandlerEntry* e = bucket(index); e != NULL; e = e->next()) {
2645 NOT_PRODUCT(_buckets++);
2646 if (e->hash() == hash) {
2647 NOT_PRODUCT(_equals++);
2648 if (fp.equals(e->fingerprint())) {
2649 #ifndef PRODUCT
2650 if (fp.is_compact()) _compact++;
2651 _hits++;
2652 #endif
2653 return e;
2654 }
2655 }
2656 }
2657 return NULL;
2658 }
2659
2660 #ifndef PRODUCT
2661 void print_statistics() {
2722 AdapterHandlerEntry* result = _current;
2723 _current = _current->next();
2724 if (_current == NULL) scan();
2725 return result;
2726 } else {
2727 return NULL;
2728 }
2729 }
2730 };
2731
2732
2733 // ---------------------------------------------------------------------------
2734 // Implementation of AdapterHandlerLibrary
2735 AdapterHandlerTable* AdapterHandlerLibrary::_adapters = NULL;
2736 AdapterHandlerEntry* AdapterHandlerLibrary::_abstract_method_handler = NULL;
2737 AdapterHandlerEntry* AdapterHandlerLibrary::_no_arg_handler = NULL;
2738 AdapterHandlerEntry* AdapterHandlerLibrary::_int_arg_handler = NULL;
2739 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_arg_handler = NULL;
2740 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_int_arg_handler = NULL;
2741 AdapterHandlerEntry* AdapterHandlerLibrary::_obj_obj_arg_handler = NULL;
2742 const int AdapterHandlerLibrary_size = 32*K;
2743 BufferBlob* AdapterHandlerLibrary::_buffer = NULL;
2744
2745 BufferBlob* AdapterHandlerLibrary::buffer_blob() {
2746 return _buffer;
2747 }
2748
2749 extern "C" void unexpected_adapter_call() {
2750 ShouldNotCallThis();
2751 }
2752
2753 static void post_adapter_creation(const AdapterBlob* new_adapter, const AdapterHandlerEntry* entry) {
2754 char blob_id[256];
2755 jio_snprintf(blob_id,
2756 sizeof(blob_id),
2757 "%s(%s)",
2758 new_adapter->name(),
2759 entry->fingerprint()->as_string());
2760 Forte::register_stub(blob_id, new_adapter->content_begin(), new_adapter->content_end());
2761
2762 if (JvmtiExport::should_post_dynamic_code_generated()) {
2766
2767 void AdapterHandlerLibrary::initialize() {
2768 ResourceMark rm;
2769 AdapterBlob* no_arg_blob = NULL;
2770 AdapterBlob* int_arg_blob = NULL;
2771 AdapterBlob* obj_arg_blob = NULL;
2772 AdapterBlob* obj_int_arg_blob = NULL;
2773 AdapterBlob* obj_obj_arg_blob = NULL;
2774 {
2775 MutexLocker mu(AdapterHandlerLibrary_lock);
2776 assert(_adapters == NULL, "Initializing more than once");
2777
2778 _adapters = new AdapterHandlerTable();
2779
2780 // Create a special handler for abstract methods. Abstract methods
2781 // are never compiled so an i2c entry is somewhat meaningless, but
2782 // throw AbstractMethodError just in case.
2783 // Pass wrong_method_abstract for the c2i transitions to return
2784 // AbstractMethodError for invalid invocations.
2785 address wrong_method_abstract = SharedRuntime::get_handle_wrong_method_abstract_stub();
2786 _abstract_method_handler = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(NULL),
2787 StubRoutines::throw_AbstractMethodError_entry(),
2788 wrong_method_abstract, wrong_method_abstract, wrong_method_abstract,
2789 wrong_method_abstract, wrong_method_abstract);
2790 _buffer = BufferBlob::create("adapters", AdapterHandlerLibrary_size);
2791
2792 CompiledEntrySignature no_args;
2793 no_args.compute_calling_conventions();
2794 _no_arg_handler = create_adapter(no_arg_blob, no_args, true);
2795
2796 CompiledEntrySignature obj_args;
2797 SigEntry::add_entry(&obj_args.sig(), T_OBJECT, NULL);
2798 obj_args.compute_calling_conventions();
2799 _obj_arg_handler = create_adapter(obj_arg_blob, obj_args, true);
2800
2801 CompiledEntrySignature int_args;
2802 SigEntry::add_entry(&int_args.sig(), T_INT, NULL);
2803 int_args.compute_calling_conventions();
2804 _int_arg_handler = create_adapter(int_arg_blob, int_args, true);
2805
2806 CompiledEntrySignature obj_int_args;
2807 SigEntry::add_entry(&obj_int_args.sig(), T_OBJECT, NULL);
2808 SigEntry::add_entry(&obj_int_args.sig(), T_INT, NULL);
2809 obj_int_args.compute_calling_conventions();
2810 _obj_int_arg_handler = create_adapter(obj_int_arg_blob, obj_int_args, true);
2811
2812 CompiledEntrySignature obj_obj_args;
2813 SigEntry::add_entry(&obj_obj_args.sig(), T_OBJECT, NULL);
2814 SigEntry::add_entry(&obj_obj_args.sig(), T_OBJECT, NULL);
2815 obj_obj_args.compute_calling_conventions();
2816 _obj_obj_arg_handler = create_adapter(obj_obj_arg_blob, obj_obj_args, true);
2817
2818 assert(no_arg_blob != NULL &&
2819 obj_arg_blob != NULL &&
2820 int_arg_blob != NULL &&
2821 obj_int_arg_blob != NULL &&
2822 obj_obj_arg_blob != NULL, "Initial adapters must be properly created");
2823 }
2824 return;
2825
2826 // Outside of the lock
2827 post_adapter_creation(no_arg_blob, _no_arg_handler);
2828 post_adapter_creation(obj_arg_blob, _obj_arg_handler);
2829 post_adapter_creation(int_arg_blob, _int_arg_handler);
2830 post_adapter_creation(obj_int_arg_blob, _obj_int_arg_handler);
2831 post_adapter_creation(obj_obj_arg_blob, _obj_obj_arg_handler);
2832 }
2833
2834 AdapterHandlerEntry* AdapterHandlerLibrary::new_entry(AdapterFingerPrint* fingerprint,
2835 address i2c_entry,
2836 address c2i_entry,
2837 address c2i_inline_entry,
2838 address c2i_inline_ro_entry,
2839 address c2i_unverified_entry,
2840 address c2i_unverified_inline_entry,
2841 address c2i_no_clinit_check_entry) {
2842 return _adapters->new_entry(fingerprint, i2c_entry, c2i_entry, c2i_inline_entry, c2i_inline_ro_entry, c2i_unverified_entry,
2843 c2i_unverified_inline_entry, c2i_no_clinit_check_entry);
2844 }
2845
2846 AdapterHandlerEntry* AdapterHandlerLibrary::get_simple_adapter(const methodHandle& method) {
2847 if (method->is_abstract()) {
2848 return NULL;
2849 }
2850 int total_args_passed = method->size_of_parameters(); // All args on stack
2851 if (total_args_passed == 0) {
2852 return _no_arg_handler;
2853 } else if (total_args_passed == 1) {
2854 if (!method->is_static() && (!InlineTypePassFieldsAsArgs || !method->method_holder()->is_inline_klass())) {
2855 return _obj_arg_handler;
2856 }
2857 switch (method->signature()->char_at(1)) {
2858 case JVM_SIGNATURE_CLASS: {
2859 if (InlineTypePassFieldsAsArgs) {
2860 SignatureStream ss(method->signature());
2861 if (method->method_holder()->is_preload_class(ss.as_symbol())) {
2862 return NULL;
2863 }
2864 }
2865 return _obj_arg_handler;
2866 }
2867 case JVM_SIGNATURE_ARRAY:
2868 return _obj_arg_handler;
2869 case JVM_SIGNATURE_INT:
2870 case JVM_SIGNATURE_BOOLEAN:
2871 case JVM_SIGNATURE_CHAR:
2872 case JVM_SIGNATURE_BYTE:
2873 case JVM_SIGNATURE_SHORT:
2874 return _int_arg_handler;
2875 }
2876 } else if (total_args_passed == 2 &&
2877 !method->is_static() && (!InlineTypePassFieldsAsArgs || !method->method_holder()->is_inline_klass())) {
2878 switch (method->signature()->char_at(1)) {
2879 case JVM_SIGNATURE_CLASS: {
2880 if (InlineTypePassFieldsAsArgs) {
2881 SignatureStream ss(method->signature());
2882 if (method->method_holder()->is_preload_class(ss.as_symbol())) {
2883 return NULL;
2884 }
2885 }
2886 return _obj_obj_arg_handler;
2887 }
2888 case JVM_SIGNATURE_ARRAY:
2889 return _obj_obj_arg_handler;
2890 case JVM_SIGNATURE_INT:
2891 case JVM_SIGNATURE_BOOLEAN:
2892 case JVM_SIGNATURE_CHAR:
2893 case JVM_SIGNATURE_BYTE:
2894 case JVM_SIGNATURE_SHORT:
2895 return _obj_int_arg_handler;
2896 }
2897 }
2898 return NULL;
2899 }
2900
2901 CompiledEntrySignature::CompiledEntrySignature(Method* method) :
2902 _method(method), _num_inline_args(0), _has_inline_recv(false),
2903 _regs(NULL), _regs_cc(NULL), _regs_cc_ro(NULL),
2904 _args_on_stack(0), _args_on_stack_cc(0), _args_on_stack_cc_ro(0),
2905 _c1_needs_stack_repair(false), _c2_needs_stack_repair(false) {
2906 _sig = new GrowableArray<SigEntry>((method != NULL) ? method->size_of_parameters() : 1);
2907 _sig_cc = new GrowableArray<SigEntry>((method != NULL) ? method->size_of_parameters() : 1);
2908 _sig_cc_ro = new GrowableArray<SigEntry>((method != NULL) ? method->size_of_parameters() : 1);
2909 }
2910
2911 // See if we can save space by sharing the same entry for VIEP and VIEP(RO),
2912 // or the same entry for VEP and VIEP(RO).
2913 CodeOffsets::Entries CompiledEntrySignature::c1_inline_ro_entry_type() const {
2914 if (!has_scalarized_args()) {
2915 // VEP/VIEP/VIEP(RO) all share the same entry. There's no packing.
2916 return CodeOffsets::Verified_Entry;
2917 }
2918 if (_method->is_static()) {
2919 // Static methods don't need VIEP(RO)
2920 return CodeOffsets::Verified_Entry;
2921 }
2922
2923 if (has_inline_recv()) {
2924 if (num_inline_args() == 1) {
2925 // Share same entry for VIEP and VIEP(RO).
2926 // This is quite common: we have an instance method in an InlineKlass that has
2927 // no inline type args other than <this>.
2928 return CodeOffsets::Verified_Inline_Entry;
2929 } else {
2930 assert(num_inline_args() > 1, "must be");
2931 // No sharing:
2932 // VIEP(RO) -- <this> is passed as object
2933 // VEP -- <this> is passed as fields
2934 return CodeOffsets::Verified_Inline_Entry_RO;
2935 }
2936 }
2937
2938 // Either a static method, or <this> is not an inline type
2939 if (args_on_stack_cc() != args_on_stack_cc_ro()) {
2940 // No sharing:
2941 // Some arguments are passed on the stack, and we have inserted reserved entries
2942 // into the VEP, but we never insert reserved entries into the VIEP(RO).
2943 return CodeOffsets::Verified_Inline_Entry_RO;
2944 } else {
2945 // Share same entry for VEP and VIEP(RO).
2946 return CodeOffsets::Verified_Entry;
2947 }
2948 }
2949
2950 void CompiledEntrySignature::compute_calling_conventions(bool init) {
2951 // Iterate over arguments and compute scalarized and non-scalarized signatures
2952 bool has_scalarized = false;
2953 if (_method != NULL) {
2954 InstanceKlass* holder = _method->method_holder();
2955 int arg_num = 0;
2956 if (!_method->is_static()) {
2957 if (holder->is_inline_klass() && InlineKlass::cast(holder)->can_be_passed_as_fields() &&
2958 (init || _method->is_scalarized_arg(arg_num))) {
2959 _sig_cc->appendAll(InlineKlass::cast(holder)->extended_sig());
2960 has_scalarized = true;
2961 _has_inline_recv = true;
2962 _num_inline_args++;
2963 } else {
2964 SigEntry::add_entry(_sig_cc, T_OBJECT, holder->name());
2965 }
2966 SigEntry::add_entry(_sig, T_OBJECT, holder->name());
2967 SigEntry::add_entry(_sig_cc_ro, T_OBJECT, holder->name());
2968 arg_num++;
2969 }
2970 for (SignatureStream ss(_method->signature()); !ss.at_return_type(); ss.next()) {
2971 BasicType bt = ss.type();
2972 if (bt == T_OBJECT || bt == T_PRIMITIVE_OBJECT) {
2973 InlineKlass* vk = ss.as_inline_klass(holder);
2974 // TODO 8284443 Mismatch handling, we need to check parent method args (look at klassVtable::needs_new_vtable_entry)
2975 if (vk != NULL && (bt == T_PRIMITIVE_OBJECT || holder->is_preload_class(vk->name())) &&
2976 vk->can_be_passed_as_fields() && (init || _method->is_scalarized_arg(arg_num))) {
2977 _num_inline_args++;
2978 has_scalarized = true;
2979 int last = _sig_cc->length();
2980 int last_ro = _sig_cc_ro->length();
2981 _sig_cc->appendAll(vk->extended_sig());
2982 _sig_cc_ro->appendAll(vk->extended_sig());
2983 if (bt == T_OBJECT) {
2984 // Nullable inline type argument, insert InlineTypeBaseNode::IsInit field right after T_PRIMITIVE_OBJECT
2985 _sig_cc->insert_before(last+1, SigEntry(T_BOOLEAN, -1, NULL));
2986 _sig_cc_ro->insert_before(last_ro+1, SigEntry(T_BOOLEAN, -1, NULL));
2987 }
2988 } else {
2989 SigEntry::add_entry(_sig_cc, T_OBJECT, ss.as_symbol());
2990 SigEntry::add_entry(_sig_cc_ro, T_OBJECT, ss.as_symbol());
2991 }
2992 bt = T_OBJECT;
2993 } else {
2994 SigEntry::add_entry(_sig_cc, ss.type(), ss.as_symbol());
2995 SigEntry::add_entry(_sig_cc_ro, ss.type(), ss.as_symbol());
2996 }
2997 SigEntry::add_entry(_sig, bt, ss.as_symbol());
2998 if (bt != T_VOID) {
2999 arg_num++;
3000 }
3001 }
3002 }
3003
3004 // Compute the non-scalarized calling convention
3005 _regs = NEW_RESOURCE_ARRAY(VMRegPair, _sig->length());
3006 _args_on_stack = SharedRuntime::java_calling_convention(_sig, _regs);
3007
3008 // Compute the scalarized calling conventions if there are scalarized inline types in the signature
3009 if (has_scalarized && !_method->is_native()) {
3010 _regs_cc = NEW_RESOURCE_ARRAY(VMRegPair, _sig_cc->length());
3011 _args_on_stack_cc = SharedRuntime::java_calling_convention(_sig_cc, _regs_cc);
3012
3013 _regs_cc_ro = NEW_RESOURCE_ARRAY(VMRegPair, _sig_cc_ro->length());
3014 _args_on_stack_cc_ro = SharedRuntime::java_calling_convention(_sig_cc_ro, _regs_cc_ro);
3015
3016 _c1_needs_stack_repair = (_args_on_stack_cc < _args_on_stack) || (_args_on_stack_cc_ro < _args_on_stack);
3017 _c2_needs_stack_repair = (_args_on_stack_cc > _args_on_stack) || (_args_on_stack_cc > _args_on_stack_cc_ro);
3018
3019 // Upper bound on stack arguments to avoid hitting the argument limit and
3020 // bailing out of compilation ("unsupported incoming calling sequence").
3021 // TODO we need a reasonable limit (flag?) here
3022 if (MAX2(_args_on_stack_cc, _args_on_stack_cc_ro) <= 60) {
3023 return; // Success
3024 }
3025 }
3026
3027 // No scalarized args
3028 _sig_cc = _sig;
3029 _regs_cc = _regs;
3030 _args_on_stack_cc = _args_on_stack;
3031
3032 _sig_cc_ro = _sig;
3033 _regs_cc_ro = _regs;
3034 _args_on_stack_cc_ro = _args_on_stack;
3035 }
3036
3037 AdapterHandlerEntry* AdapterHandlerLibrary::get_adapter(const methodHandle& method) {
3038 // Use customized signature handler. Need to lock around updates to
3039 // the AdapterHandlerTable (it is not safe for concurrent readers
3040 // and a single writer: this could be fixed if it becomes a
3041 // problem).
3042 assert(_adapters != NULL, "Uninitialized");
3043
3044 // Fast-path for trivial adapters
3045 AdapterHandlerEntry* entry = get_simple_adapter(method);
3046 if (entry != NULL) {
3047 return entry;
3048 }
3049
3050 ResourceMark rm;
3051 AdapterBlob* new_adapter = NULL;
3052
3053 CompiledEntrySignature ces(method());
3054 ces.compute_calling_conventions();
3055 if (ces.has_scalarized_args()) {
3056 method->set_has_scalarized_args(true);
3057 method->set_c1_needs_stack_repair(ces.c1_needs_stack_repair());
3058 method->set_c2_needs_stack_repair(ces.c2_needs_stack_repair());
3059 } else if (method->is_abstract()) {
3060 return _abstract_method_handler;
3061 }
3062
3063 {
3064 MutexLocker mu(AdapterHandlerLibrary_lock);
3065
3066 if (ces.has_scalarized_args() && method->is_abstract()) {
3067 // Save a C heap allocated version of the signature for abstract methods with scalarized inline type arguments
3068 address wrong_method_abstract = SharedRuntime::get_handle_wrong_method_abstract_stub();
3069 entry = AdapterHandlerLibrary::new_entry(new AdapterFingerPrint(NULL),
3070 StubRoutines::throw_AbstractMethodError_entry(),
3071 wrong_method_abstract, wrong_method_abstract, wrong_method_abstract,
3072 wrong_method_abstract, wrong_method_abstract);
3073 GrowableArray<SigEntry>* heap_sig = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<SigEntry>(ces.sig_cc_ro().length(), mtInternal);
3074 heap_sig->appendAll(&ces.sig_cc_ro());
3075 entry->set_sig_cc(heap_sig);
3076 return entry;
3077 }
3078
3079 // Lookup method signature's fingerprint
3080 entry = _adapters->lookup(&ces.sig_cc(), ces.has_inline_recv());
3081
3082 if (entry != NULL) {
3083 #ifdef ASSERT
3084 if (VerifyAdapterSharing) {
3085 AdapterBlob* comparison_blob = NULL;
3086 AdapterHandlerEntry* comparison_entry = create_adapter(comparison_blob, ces, false);
3087 assert(comparison_blob == NULL, "no blob should be created when creating an adapter for comparison");
3088 assert(comparison_entry->compare_code(entry), "code must match");
3089 // Release the one just created and return the original
3090 _adapters->free_entry(comparison_entry);
3091 }
3092 #endif
3093 return entry;
3094 }
3095
3096 entry = create_adapter(new_adapter, ces, /* allocate_code_blob */ true);
3097 }
3098
3099 // Outside of the lock
3100 if (new_adapter != NULL) {
3101 post_adapter_creation(new_adapter, entry);
3102 }
3103 return entry;
3104 }
3105
3106 AdapterHandlerEntry* AdapterHandlerLibrary::create_adapter(AdapterBlob*& new_adapter,
3107 CompiledEntrySignature& ces,
3108 bool allocate_code_blob) {
3109
3110 // StubRoutines::code2() is initialized after this function can be called. As a result,
3111 // VerifyAdapterCalls and VerifyAdapterSharing can fail if we re-use code that generated
3112 // prior to StubRoutines::code2() being set. Checks refer to checks generated in an I2C
3113 // stub that ensure that an I2C stub is called from an interpreter frame.
3114 bool contains_all_checks = StubRoutines::code2() != NULL;
3115
3116 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
3117 CodeBuffer buffer(buf);
3118 short buffer_locs[20];
3119 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs,
3120 sizeof(buffer_locs)/sizeof(relocInfo));
3121
3122 // Make a C heap allocated version of the fingerprint to store in the adapter
3123 AdapterFingerPrint* fingerprint = new AdapterFingerPrint(&ces.sig_cc(), ces.has_inline_recv());
3124 MacroAssembler _masm(&buffer);
3125 AdapterHandlerEntry* entry = SharedRuntime::generate_i2c2i_adapters(&_masm,
3126 ces.args_on_stack(),
3127 &ces.sig(),
3128 ces.regs(),
3129 &ces.sig_cc(),
3130 ces.regs_cc(),
3131 &ces.sig_cc_ro(),
3132 ces.regs_cc_ro(),
3133 fingerprint,
3134 new_adapter,
3135 allocate_code_blob);
3136
3137 if (ces.has_scalarized_args()) {
3138 // Save a C heap allocated version of the scalarized signature and store it in the adapter
3139 GrowableArray<SigEntry>* heap_sig = new (ResourceObj::C_HEAP, mtInternal) GrowableArray<SigEntry>(ces.sig_cc().length(), mtInternal);
3140 heap_sig->appendAll(&ces.sig_cc());
3141 entry->set_sig_cc(heap_sig);
3142 }
3143
3144 #ifdef ASSERT
3145 if (VerifyAdapterSharing) {
3146 entry->save_code(buf->code_begin(), buffer.insts_size());
3147 if (!allocate_code_blob) {
3148 return entry;
3149 }
3150 }
3151 #endif
3152
3153 NOT_PRODUCT(int insts_size = buffer.insts_size());
3154 if (new_adapter == NULL) {
3155 // CodeCache is full, disable compilation
3156 // Ought to log this but compile log is only per compile thread
3157 // and we're some non descript Java thread.
3158 return NULL;
3159 }
3160 entry->relocate(new_adapter->content_begin());
3161 #ifndef PRODUCT
3162 // debugging suppport
3163 if (PrintAdapterHandlers || PrintStubCode) {
3164 ttyLocker ttyl;
3165 entry->print_adapter_on(tty);
3166 tty->print_cr("i2c argument handler #%d for: %s %s (%d bytes generated)",
3167 _adapters->number_of_entries(), fingerprint->as_basic_args_string(),
3168 fingerprint->as_string(), insts_size);
3169 tty->print_cr("c2i argument handler starts at %p", entry->get_c2i_entry());
3170 if (Verbose || PrintStubCode) {
3171 address first_pc = entry->base_address();
3172 if (first_pc != NULL) {
3173 Disassembler::decode(first_pc, first_pc + insts_size, tty
3174 NOT_PRODUCT(COMMA &new_adapter->asm_remarks()));
3175 tty->cr();
3176 }
3177 }
3178 }
3179 #endif
3180
3181 // Add the entry only if the entry contains all required checks (see sharedRuntime_xxx.cpp)
3182 // The checks are inserted only if -XX:+VerifyAdapterCalls is specified.
3183 if (contains_all_checks || !VerifyAdapterCalls) {
3184 _adapters->add(entry);
3185 }
3186 return entry;
3187 }
3188
3189 address AdapterHandlerEntry::base_address() {
3190 address base = _i2c_entry;
3191 if (base == NULL) base = _c2i_entry;
3192 assert(base <= _c2i_entry || _c2i_entry == NULL, "");
3193 assert(base <= _c2i_inline_entry || _c2i_inline_entry == NULL, "");
3194 assert(base <= _c2i_inline_ro_entry || _c2i_inline_ro_entry == NULL, "");
3195 assert(base <= _c2i_unverified_entry || _c2i_unverified_entry == NULL, "");
3196 assert(base <= _c2i_unverified_inline_entry || _c2i_unverified_inline_entry == NULL, "");
3197 assert(base <= _c2i_no_clinit_check_entry || _c2i_no_clinit_check_entry == NULL, "");
3198 return base;
3199 }
3200
3201 void AdapterHandlerEntry::relocate(address new_base) {
3202 address old_base = base_address();
3203 assert(old_base != NULL, "");
3204 ptrdiff_t delta = new_base - old_base;
3205 if (_i2c_entry != NULL)
3206 _i2c_entry += delta;
3207 if (_c2i_entry != NULL)
3208 _c2i_entry += delta;
3209 if (_c2i_inline_entry != NULL)
3210 _c2i_inline_entry += delta;
3211 if (_c2i_inline_ro_entry != NULL)
3212 _c2i_inline_ro_entry += delta;
3213 if (_c2i_unverified_entry != NULL)
3214 _c2i_unverified_entry += delta;
3215 if (_c2i_unverified_inline_entry != NULL)
3216 _c2i_unverified_inline_entry += delta;
3217 if (_c2i_no_clinit_check_entry != NULL)
3218 _c2i_no_clinit_check_entry += delta;
3219 assert(base_address() == new_base, "");
3220 }
3221
3222
3223 void AdapterHandlerEntry::deallocate() {
3224 delete _fingerprint;
3225 if (_sig_cc != NULL) {
3226 delete _sig_cc;
3227 }
3228 #ifdef ASSERT
3229 FREE_C_HEAP_ARRAY(unsigned char, _saved_code);
3230 #endif
3231 }
3232
3233
3234 #ifdef ASSERT
3235 // Capture the code before relocation so that it can be compared
3236 // against other versions. If the code is captured after relocation
3237 // then relative instructions won't be equivalent.
3238 void AdapterHandlerEntry::save_code(unsigned char* buffer, int length) {
3239 _saved_code = NEW_C_HEAP_ARRAY(unsigned char, length, mtCode);
3240 _saved_code_length = length;
3241 memcpy(_saved_code, buffer, length);
3242 }
3243
3244
3245 bool AdapterHandlerEntry::compare_code(AdapterHandlerEntry* other) {
3246 assert(_saved_code != NULL && other->_saved_code != NULL, "code not saved");
3247
3280 assert(compile_id > 0, "Must generate native wrapper");
3281
3282
3283 ResourceMark rm;
3284 BufferBlob* buf = buffer_blob(); // the temporary code buffer in CodeCache
3285 if (buf != NULL) {
3286 CodeBuffer buffer(buf);
3287 struct { double data[20]; } locs_buf;
3288 buffer.insts()->initialize_shared_locs((relocInfo*)&locs_buf, sizeof(locs_buf) / sizeof(relocInfo));
3289 #if defined(AARCH64)
3290 // On AArch64 with ZGC and nmethod entry barriers, we need all oops to be
3291 // in the constant pool to ensure ordering between the barrier and oops
3292 // accesses. For native_wrappers we need a constant.
3293 buffer.initialize_consts_size(8);
3294 #endif
3295 MacroAssembler _masm(&buffer);
3296
3297 // Fill in the signature array, for the calling-convention call.
3298 const int total_args_passed = method->size_of_parameters();
3299
3300 BasicType stack_sig_bt[16];
3301 VMRegPair stack_regs[16];
3302 BasicType* sig_bt = (total_args_passed <= 16) ? stack_sig_bt : NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
3303 VMRegPair* regs = (total_args_passed <= 16) ? stack_regs : NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
3304
3305 int i = 0;
3306 if (!method->is_static()) { // Pass in receiver first
3307 sig_bt[i++] = T_OBJECT;
3308 }
3309 SignatureStream ss(method->signature());
3310 for (; !ss.at_return_type(); ss.next()) {
3311 sig_bt[i++] = ss.type(); // Collect remaining bits of signature
3312 if (ss.type() == T_LONG || ss.type() == T_DOUBLE) {
3313 sig_bt[i++] = T_VOID; // Longs & doubles take 2 Java slots
3314 }
3315 }
3316 assert(i == total_args_passed, "");
3317 BasicType ret_type = ss.type();
3318
3319 // Now get the compiled-Java arguments layout.
3320 int comp_args_on_stack = SharedRuntime::java_calling_convention(sig_bt, regs, total_args_passed);
3321
3322 // Generate the compiled-to-native wrapper code
3323 nm = SharedRuntime::generate_native_wrapper(&_masm, method, compile_id, sig_bt, regs, ret_type);
3324
3325 if (nm != NULL) {
3326 {
3327 MutexLocker pl(CompiledMethod_lock, Mutex::_no_safepoint_check_flag);
3328 if (nm->make_in_use()) {
3329 method->set_code(method, nm);
3330 }
3331 }
3332
3333 DirectiveSet* directive = DirectivesStack::getDefaultDirective(CompileBroker::compiler(CompLevel_simple));
3334 if (directive->PrintAssemblyOption) {
3335 nm->print_code();
3336 }
3337 DirectivesStack::release(directive);
3518 AdapterHandlerTableIterator iter(_adapters);
3519 while (iter.has_next()) {
3520 AdapterHandlerEntry* a = iter.next();
3521 if (b == CodeCache::find_blob(a->get_i2c_entry())) {
3522 st->print("Adapter for signature: ");
3523 a->print_adapter_on(tty);
3524 return;
3525 }
3526 }
3527 assert(false, "Should have found handler");
3528 }
3529
3530 void AdapterHandlerEntry::print_adapter_on(outputStream* st) const {
3531 st->print("AHE@" INTPTR_FORMAT ": %s", p2i(this), fingerprint()->as_string());
3532 if (get_i2c_entry() != NULL) {
3533 st->print(" i2c: " INTPTR_FORMAT, p2i(get_i2c_entry()));
3534 }
3535 if (get_c2i_entry() != NULL) {
3536 st->print(" c2i: " INTPTR_FORMAT, p2i(get_c2i_entry()));
3537 }
3538 if (get_c2i_entry() != NULL) {
3539 st->print(" c2iVE: " INTPTR_FORMAT, p2i(get_c2i_inline_entry()));
3540 }
3541 if (get_c2i_entry() != NULL) {
3542 st->print(" c2iVROE: " INTPTR_FORMAT, p2i(get_c2i_inline_ro_entry()));
3543 }
3544 if (get_c2i_unverified_entry() != NULL) {
3545 st->print(" c2iUE: " INTPTR_FORMAT, p2i(get_c2i_unverified_entry()));
3546 }
3547 if (get_c2i_unverified_entry() != NULL) {
3548 st->print(" c2iUVE: " INTPTR_FORMAT, p2i(get_c2i_unverified_inline_entry()));
3549 }
3550 if (get_c2i_no_clinit_check_entry() != NULL) {
3551 st->print(" c2iNCI: " INTPTR_FORMAT, p2i(get_c2i_no_clinit_check_entry()));
3552 }
3553 st->cr();
3554 }
3555
3556 #ifndef PRODUCT
3557
3558 void AdapterHandlerLibrary::print_statistics() {
3559 _adapters->print_statistics();
3560 }
3561
3562 #endif /* PRODUCT */
3563
3564 JRT_LEAF(void, SharedRuntime::enable_stack_reserved_zone(JavaThread* current))
3565 StackOverflow* overflow_state = current->stack_overflow_state();
3566 overflow_state->enable_stack_reserved_zone(/*check_if_disabled*/true);
3567 overflow_state->set_reserved_stack_activation(current->stack_base());
3568 JRT_END
3613 break;
3614 } else {
3615 fr = fr.java_sender();
3616 }
3617 }
3618 return activation;
3619 }
3620
3621 void SharedRuntime::on_slowpath_allocation_exit(JavaThread* current) {
3622 // After any safepoint, just before going back to compiled code,
3623 // we inform the GC that we will be doing initializing writes to
3624 // this object in the future without emitting card-marks, so
3625 // GC may take any compensating steps.
3626
3627 oop new_obj = current->vm_result();
3628 if (new_obj == NULL) return;
3629
3630 BarrierSet *bs = BarrierSet::barrier_set();
3631 bs->on_slowpath_allocation_exit(current, new_obj);
3632 }
3633
3634 // We are at a compiled code to interpreter call. We need backing
3635 // buffers for all inline type arguments. Allocate an object array to
3636 // hold them (convenient because once we're done with it we don't have
3637 // to worry about freeing it).
3638 oop SharedRuntime::allocate_inline_types_impl(JavaThread* current, methodHandle callee, bool allocate_receiver, TRAPS) {
3639 assert(InlineTypePassFieldsAsArgs, "no reason to call this");
3640 ResourceMark rm;
3641
3642 int nb_slots = 0;
3643 InstanceKlass* holder = callee->method_holder();
3644 allocate_receiver &= !callee->is_static() && holder->is_inline_klass() && callee->is_scalarized_arg(0);
3645 if (allocate_receiver) {
3646 nb_slots++;
3647 }
3648 int arg_num = callee->is_static() ? 0 : 1;
3649 for (SignatureStream ss(callee->signature()); !ss.at_return_type(); ss.next()) {
3650 BasicType bt = ss.type();
3651 if ((bt == T_OBJECT || bt == T_PRIMITIVE_OBJECT) && callee->is_scalarized_arg(arg_num)) {
3652 nb_slots++;
3653 }
3654 if (bt != T_VOID) {
3655 arg_num++;
3656 }
3657 }
3658 objArrayOop array_oop = oopFactory::new_objectArray(nb_slots, CHECK_NULL);
3659 objArrayHandle array(THREAD, array_oop);
3660 arg_num = callee->is_static() ? 0 : 1;
3661 int i = 0;
3662 if (allocate_receiver) {
3663 InlineKlass* vk = InlineKlass::cast(holder);
3664 oop res = vk->allocate_instance(CHECK_NULL);
3665 array->obj_at_put(i++, res);
3666 }
3667 for (SignatureStream ss(callee->signature()); !ss.at_return_type(); ss.next()) {
3668 BasicType bt = ss.type();
3669 if ((bt == T_OBJECT || bt == T_PRIMITIVE_OBJECT) && callee->is_scalarized_arg(arg_num)) {
3670 InlineKlass* vk = ss.as_inline_klass(holder);
3671 assert(vk != NULL, "Unexpected klass");
3672 oop res = vk->allocate_instance(CHECK_NULL);
3673 array->obj_at_put(i++, res);
3674 }
3675 if (bt != T_VOID) {
3676 arg_num++;
3677 }
3678 }
3679 return array();
3680 }
3681
3682 JRT_ENTRY(void, SharedRuntime::allocate_inline_types(JavaThread* current, Method* callee_method, bool allocate_receiver))
3683 methodHandle callee(current, callee_method);
3684 oop array = SharedRuntime::allocate_inline_types_impl(current, callee, allocate_receiver, CHECK);
3685 current->set_vm_result(array);
3686 current->set_vm_result_2(callee()); // TODO: required to keep callee live?
3687 JRT_END
3688
3689 // We're returning from an interpreted method: load each field into a
3690 // register following the calling convention
3691 JRT_LEAF(void, SharedRuntime::load_inline_type_fields_in_regs(JavaThread* current, oopDesc* res))
3692 {
3693 assert(res->klass()->is_inline_klass(), "only inline types here");
3694 ResourceMark rm;
3695 RegisterMap reg_map(current);
3696 frame stubFrame = current->last_frame();
3697 frame callerFrame = stubFrame.sender(®_map);
3698 assert(callerFrame.is_interpreted_frame(), "should be coming from interpreter");
3699
3700 InlineKlass* vk = InlineKlass::cast(res->klass());
3701
3702 const Array<SigEntry>* sig_vk = vk->extended_sig();
3703 const Array<VMRegPair>* regs = vk->return_regs();
3704
3705 if (regs == NULL) {
3706 // The fields of the inline klass don't fit in registers, bail out
3707 return;
3708 }
3709
3710 int j = 1;
3711 for (int i = 0; i < sig_vk->length(); i++) {
3712 BasicType bt = sig_vk->at(i)._bt;
3713 if (bt == T_PRIMITIVE_OBJECT) {
3714 continue;
3715 }
3716 if (bt == T_VOID) {
3717 if (sig_vk->at(i-1)._bt == T_LONG ||
3718 sig_vk->at(i-1)._bt == T_DOUBLE) {
3719 j++;
3720 }
3721 continue;
3722 }
3723 int off = sig_vk->at(i)._offset;
3724 assert(off > 0, "offset in object should be positive");
3725 VMRegPair pair = regs->at(j);
3726 address loc = reg_map.location(pair.first());
3727 switch(bt) {
3728 case T_BOOLEAN:
3729 *(jboolean*)loc = res->bool_field(off);
3730 break;
3731 case T_CHAR:
3732 *(jchar*)loc = res->char_field(off);
3733 break;
3734 case T_BYTE:
3735 *(jbyte*)loc = res->byte_field(off);
3736 break;
3737 case T_SHORT:
3738 *(jshort*)loc = res->short_field(off);
3739 break;
3740 case T_INT: {
3741 *(jint*)loc = res->int_field(off);
3742 break;
3743 }
3744 case T_LONG:
3745 #ifdef _LP64
3746 *(intptr_t*)loc = res->long_field(off);
3747 #else
3748 Unimplemented();
3749 #endif
3750 break;
3751 case T_OBJECT:
3752 case T_ARRAY: {
3753 *(oop*)loc = res->obj_field(off);
3754 break;
3755 }
3756 case T_FLOAT:
3757 *(jfloat*)loc = res->float_field(off);
3758 break;
3759 case T_DOUBLE:
3760 *(jdouble*)loc = res->double_field(off);
3761 break;
3762 default:
3763 ShouldNotReachHere();
3764 }
3765 j++;
3766 }
3767 assert(j == regs->length(), "missed a field?");
3768
3769 #ifdef ASSERT
3770 VMRegPair pair = regs->at(0);
3771 address loc = reg_map.location(pair.first());
3772 assert(*(oopDesc**)loc == res, "overwritten object");
3773 #endif
3774
3775 current->set_vm_result(res);
3776 }
3777 JRT_END
3778
3779 // We've returned to an interpreted method, the interpreter needs a
3780 // reference to an inline type instance. Allocate it and initialize it
3781 // from field's values in registers.
3782 JRT_BLOCK_ENTRY(void, SharedRuntime::store_inline_type_fields_to_buf(JavaThread* current, intptr_t res))
3783 {
3784 ResourceMark rm;
3785 RegisterMap reg_map(current);
3786 frame stubFrame = current->last_frame();
3787 frame callerFrame = stubFrame.sender(®_map);
3788
3789 #ifdef ASSERT
3790 InlineKlass* verif_vk = InlineKlass::returned_inline_klass(reg_map);
3791 #endif
3792
3793 if (!is_set_nth_bit(res, 0)) {
3794 // We're not returning with inline type fields in registers (the
3795 // calling convention didn't allow it for this inline klass)
3796 assert(!Metaspace::contains((void*)res), "should be oop or pointer in buffer area");
3797 current->set_vm_result((oopDesc*)res);
3798 assert(verif_vk == NULL, "broken calling convention");
3799 return;
3800 }
3801
3802 clear_nth_bit(res, 0);
3803 InlineKlass* vk = (InlineKlass*)res;
3804 assert(verif_vk == vk, "broken calling convention");
3805 assert(Metaspace::contains((void*)res), "should be klass");
3806
3807 // Allocate handles for every oop field so they are safe in case of
3808 // a safepoint when allocating
3809 GrowableArray<Handle> handles;
3810 vk->save_oop_fields(reg_map, handles);
3811
3812 // It's unsafe to safepoint until we are here
3813 JRT_BLOCK;
3814 {
3815 JavaThread* THREAD = current;
3816 oop vt = vk->realloc_result(reg_map, handles, CHECK);
3817 current->set_vm_result(vt);
3818 }
3819 JRT_BLOCK_END;
3820 }
3821 JRT_END
3822
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