9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "c1/c1_Canonicalizer.hpp"
26 #include "c1/c1_CFGPrinter.hpp"
27 #include "c1/c1_Compilation.hpp"
28 #include "c1/c1_GraphBuilder.hpp"
29 #include "c1/c1_InstructionPrinter.hpp"
30 #include "ci/ciCallSite.hpp"
31 #include "ci/ciField.hpp"
32 #include "ci/ciKlass.hpp"
33 #include "ci/ciMemberName.hpp"
34 #include "ci/ciSymbols.hpp"
35 #include "ci/ciUtilities.inline.hpp"
36 #include "classfile/javaClasses.hpp"
37 #include "compiler/compilationPolicy.hpp"
38 #include "compiler/compileBroker.hpp"
39 #include "compiler/compilerEvent.hpp"
40 #include "interpreter/bytecode.hpp"
41 #include "jfr/jfrEvents.hpp"
42 #include "memory/resourceArea.hpp"
43 #include "runtime/sharedRuntime.hpp"
44 #include "utilities/checkedCast.hpp"
45 #include "utilities/macros.hpp"
46 #if INCLUDE_JFR
47 #include "jfr/jfr.hpp"
48 #endif
49
50 class BlockListBuilder {
51 private:
52 Compilation* _compilation;
53 IRScope* _scope;
54
55 BlockList _blocks; // internal list of all blocks
56 BlockList* _bci2block; // mapping from bci to blocks for GraphBuilder
57 GrowableArray<BlockList> _bci2block_successors; // Mapping bcis to their blocks successors while we dont have a blockend
58
59 // fields used by mark_loops
60 ResourceBitMap _active; // for iteration of control flow graph
61 ResourceBitMap _visited; // for iteration of control flow graph
62 GrowableArray<ResourceBitMap> _loop_map; // caches the information if a block is contained in a loop
1028
1029 // Also check parent jsrs (if any) at this time to see whether
1030 // they are using this local. We don't handle skipping over a
1031 // ret.
1032 for (ScopeData* cur_scope_data = scope_data()->parent();
1033 cur_scope_data != nullptr && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope();
1034 cur_scope_data = cur_scope_data->parent()) {
1035 if (cur_scope_data->jsr_return_address_local() == index) {
1036 BAILOUT("subroutine overwrites return address from previous subroutine");
1037 }
1038 }
1039 } else if (index == scope_data()->jsr_return_address_local()) {
1040 scope_data()->set_jsr_return_address_local(-1);
1041 }
1042 }
1043
1044 state->store_local(index, x);
1045 }
1046
1047
1048 void GraphBuilder::load_indexed(BasicType type) {
1049 // In case of in block code motion in range check elimination
1050 ValueStack* state_before = copy_state_indexed_access();
1051 compilation()->set_has_access_indexed(true);
1052 Value index = ipop();
1053 Value array = apop();
1054 Value length = nullptr;
1055 if (CSEArrayLength ||
1056 (array->as_Constant() != nullptr) ||
1057 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) ||
1058 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant()) ||
1059 (array->as_NewMultiArray() && array->as_NewMultiArray()->dims()->at(0)->type()->is_constant())) {
1060 length = append(new ArrayLength(array, state_before));
1061 }
1062 push(as_ValueType(type), append(new LoadIndexed(array, index, length, type, state_before)));
1063 }
1064
1065
1066 void GraphBuilder::store_indexed(BasicType type) {
1067 // In case of in block code motion in range check elimination
1068 ValueStack* state_before = copy_state_indexed_access();
1069 compilation()->set_has_access_indexed(true);
1070 Value value = pop(as_ValueType(type));
1071 Value index = ipop();
1072 Value array = apop();
1073 Value length = nullptr;
1074 if (CSEArrayLength ||
1075 (array->as_Constant() != nullptr) ||
1076 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) ||
1077 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant()) ||
1078 (array->as_NewMultiArray() && array->as_NewMultiArray()->dims()->at(0)->type()->is_constant())) {
1079 length = append(new ArrayLength(array, state_before));
1080 }
1081 ciType* array_type = array->declared_type();
1082 bool check_boolean = false;
1083 if (array_type != nullptr) {
1084 if (array_type->is_loaded() &&
1085 array_type->as_array_klass()->element_type()->basic_type() == T_BOOLEAN) {
1086 assert(type == T_BYTE, "boolean store uses bastore");
1087 Value mask = append(new Constant(new IntConstant(1)));
1088 value = append(new LogicOp(Bytecodes::_iand, value, mask));
1089 }
1090 } else if (type == T_BYTE) {
1091 check_boolean = true;
1092 }
1093 StoreIndexed* result = new StoreIndexed(array, index, length, type, value, state_before, check_boolean);
1094 append(result);
1095 _memory->store_value(value);
1096
1097 if (type == T_OBJECT && is_profiling()) {
1098 // Note that we'd collect profile data in this method if we wanted it.
1099 compilation()->set_would_profile(true);
1100
1101 if (profile_checkcasts()) {
1102 result->set_profiled_method(method());
1103 result->set_profiled_bci(bci());
1104 result->set_should_profile(true);
1105 }
1106 }
1107 }
1108
1109
1110 void GraphBuilder::stack_op(Bytecodes::Code code) {
1111 switch (code) {
1112 case Bytecodes::_pop:
1113 { state()->raw_pop();
1114 }
1115 break;
1116 case Bytecodes::_pop2:
1117 { state()->raw_pop();
1118 state()->raw_pop();
1119 }
1120 break;
1121 case Bytecodes::_dup:
1122 { Value w = state()->raw_pop();
1123 state()->raw_push(w);
1124 state()->raw_push(w);
1125 }
1126 break;
1127 case Bytecodes::_dup_x1:
1128 { Value w1 = state()->raw_pop();
1129 Value w2 = state()->raw_pop();
1274
1275
1276 void GraphBuilder::_goto(int from_bci, int to_bci) {
1277 Goto *x = new Goto(block_at(to_bci), to_bci <= from_bci);
1278 if (is_profiling()) {
1279 compilation()->set_would_profile(true);
1280 x->set_profiled_bci(bci());
1281 if (profile_branches()) {
1282 x->set_profiled_method(method());
1283 x->set_should_profile(true);
1284 }
1285 }
1286 append(x);
1287 }
1288
1289
1290 void GraphBuilder::if_node(Value x, If::Condition cond, Value y, ValueStack* state_before) {
1291 BlockBegin* tsux = block_at(stream()->get_dest());
1292 BlockBegin* fsux = block_at(stream()->next_bci());
1293 bool is_bb = tsux->bci() < stream()->cur_bci() || fsux->bci() < stream()->cur_bci();
1294 // In case of loop invariant code motion or predicate insertion
1295 // before the body of a loop the state is needed
1296 Instruction *i = append(new If(x, cond, false, y, tsux, fsux, (is_bb || compilation()->is_optimistic()) ? state_before : nullptr, is_bb));
1297
1298 assert(i->as_Goto() == nullptr ||
1299 (i->as_Goto()->sux_at(0) == tsux && i->as_Goto()->is_safepoint() == (tsux->bci() < stream()->cur_bci())) ||
1300 (i->as_Goto()->sux_at(0) == fsux && i->as_Goto()->is_safepoint() == (fsux->bci() < stream()->cur_bci())),
1301 "safepoint state of Goto returned by canonicalizer incorrect");
1302
1303 if (is_profiling()) {
1304 If* if_node = i->as_If();
1305 if (if_node != nullptr) {
1306 // Note that we'd collect profile data in this method if we wanted it.
1307 compilation()->set_would_profile(true);
1308 // At level 2 we need the proper bci to count backedges
1309 if_node->set_profiled_bci(bci());
1310 if (profile_branches()) {
1311 // Successors can be rotated by the canonicalizer, check for this case.
1312 if_node->set_profiled_method(method());
1313 if_node->set_should_profile(true);
1314 if (if_node->tsux() == fsux) {
1315 if_node->set_swapped(true);
1316 }
1531 }
1532
1533 if (needs_check) {
1534 // Perform the registration of finalizable objects.
1535 ValueStack* state_before = copy_state_for_exception();
1536 load_local(objectType, 0);
1537 append_split(new Intrinsic(voidType, vmIntrinsics::_Object_init,
1538 state()->pop_arguments(1),
1539 true, state_before, true));
1540 }
1541 }
1542
1543
1544 void GraphBuilder::method_return(Value x, bool ignore_return) {
1545 if (method()->intrinsic_id() == vmIntrinsics::_Object_init) {
1546 call_register_finalizer();
1547 }
1548
1549 // The conditions for a memory barrier are described in Parse::do_exits().
1550 bool need_mem_bar = false;
1551 if (method()->name() == ciSymbols::object_initializer_name() &&
1552 (scope()->wrote_final() || scope()->wrote_stable() ||
1553 (AlwaysSafeConstructors && scope()->wrote_fields()) ||
1554 (support_IRIW_for_not_multiple_copy_atomic_cpu && scope()->wrote_volatile()))) {
1555 need_mem_bar = true;
1556 }
1557
1558 BasicType bt = method()->return_type()->basic_type();
1559 switch (bt) {
1560 case T_BYTE:
1561 {
1562 Value shift = append(new Constant(new IntConstant(24)));
1563 x = append(new ShiftOp(Bytecodes::_ishl, x, shift));
1564 x = append(new ShiftOp(Bytecodes::_ishr, x, shift));
1565 break;
1566 }
1567 case T_SHORT:
1568 {
1569 Value shift = append(new Constant(new IntConstant(16)));
1570 x = append(new ShiftOp(Bytecodes::_ishl, x, shift));
1571 x = append(new ShiftOp(Bytecodes::_ishr, x, shift));
1572 break;
1682 // Attach dimension info to stable arrays.
1683 if (FoldStableValues &&
1684 field->is_stable() && field_type == T_ARRAY && !field_value.is_null_or_zero()) {
1685 ciArray* array = field_value.as_object()->as_array();
1686 jint dimension = field->type()->as_array_klass()->dimension();
1687 value = new StableArrayConstant(array, dimension);
1688 }
1689
1690 switch (field_type) {
1691 case T_ARRAY:
1692 case T_OBJECT:
1693 if (field_value.as_object()->should_be_constant()) {
1694 return new Constant(value);
1695 }
1696 return nullptr; // Not a constant.
1697 default:
1698 return new Constant(value);
1699 }
1700 }
1701
1702 void GraphBuilder::access_field(Bytecodes::Code code) {
1703 bool will_link;
1704 ciField* field = stream()->get_field(will_link);
1705 ciInstanceKlass* holder = field->holder();
1706 BasicType field_type = field->type()->basic_type();
1707 ValueType* type = as_ValueType(field_type);
1708 // call will_link again to determine if the field is valid.
1709 const bool needs_patching = !holder->is_loaded() ||
1710 !field->will_link(method(), code) ||
1711 PatchALot;
1712
1713 ValueStack* state_before = nullptr;
1714 if (!holder->is_initialized() || needs_patching) {
1715 // save state before instruction for debug info when
1716 // deoptimization happens during patching
1717 state_before = copy_state_before();
1718 }
1719
1720 Value obj = nullptr;
1721 if (code == Bytecodes::_getstatic || code == Bytecodes::_putstatic) {
1722 if (state_before != nullptr) {
1723 // build a patching constant
1724 obj = new Constant(new InstanceConstant(holder->java_mirror()), state_before);
1725 } else {
1726 obj = new Constant(new InstanceConstant(holder->java_mirror()));
1727 }
1728 }
1729
1730 if (code == Bytecodes::_putfield) {
1731 scope()->set_wrote_fields();
1732 if (field->is_volatile()) {
1733 scope()->set_wrote_volatile();
1734 }
1735 if (field->is_final()) {
1736 scope()->set_wrote_final();
1737 }
1738 if (field->is_stable()) {
1739 scope()->set_wrote_stable();
1740 }
1741 }
1742
1743 const int offset = !needs_patching ? field->offset_in_bytes() : -1;
1744 switch (code) {
1745 case Bytecodes::_getstatic: {
1746 // check for compile-time constants, i.e., initialized static final fields
1747 Value constant = nullptr;
1748 if (field->is_static_constant() && !PatchALot) {
1749 ciConstant field_value = field->constant_value();
1750 assert(!field->is_stable() || !field_value.is_null_or_zero(),
1751 "stable static w/ default value shouldn't be a constant");
1752 constant = make_constant(field_value, field);
1753 }
1754 if (constant != nullptr) {
1755 push(type, append(constant));
1756 } else {
1757 if (state_before == nullptr) {
1758 state_before = copy_state_for_exception();
1759 }
1760 push(type, append(new LoadField(append(obj), offset, field, true,
1761 state_before, needs_patching)));
1762 }
1763 break;
1764 }
1765 case Bytecodes::_putstatic: {
1766 Value val = pop(type);
1767 if (state_before == nullptr) {
1768 state_before = copy_state_for_exception();
1769 }
1770 if (field->type()->basic_type() == T_BOOLEAN) {
1771 Value mask = append(new Constant(new IntConstant(1)));
1772 val = append(new LogicOp(Bytecodes::_iand, val, mask));
1773 }
1774 append(new StoreField(append(obj), offset, field, val, true, state_before, needs_patching));
1775 break;
1776 }
1777 case Bytecodes::_getfield: {
1778 // Check for compile-time constants, i.e., trusted final non-static fields.
1779 Value constant = nullptr;
1780 obj = apop();
1781 ObjectType* obj_type = obj->type()->as_ObjectType();
1782 if (field->is_constant() && obj_type->is_constant() && !PatchALot) {
1783 ciObject* const_oop = obj_type->constant_value();
1784 if (!const_oop->is_null_object() && const_oop->is_loaded()) {
1785 ciConstant field_value = field->constant_value_of(const_oop);
1786 if (field_value.is_valid()) {
1787 constant = make_constant(field_value, field);
1788 // For CallSite objects add a dependency for invalidation of the optimization.
1789 if (field->is_call_site_target()) {
1790 ciCallSite* call_site = const_oop->as_call_site();
1791 if (!call_site->is_fully_initialized_constant_call_site()) {
1792 ciMethodHandle* target = field_value.as_object()->as_method_handle();
1793 dependency_recorder()->assert_call_site_target_value(call_site, target);
1794 }
1795 }
1796 }
1797 }
1798 }
1799 if (constant != nullptr) {
1800 push(type, append(constant));
1801 } else {
1802 if (state_before == nullptr) {
1803 state_before = copy_state_for_exception();
1804 }
1805 LoadField* load = new LoadField(obj, offset, field, false, state_before, needs_patching);
1806 Value replacement = !needs_patching ? _memory->load(load) : load;
1807 if (replacement != load) {
1808 assert(replacement->is_linked() || !replacement->can_be_linked(), "should already by linked");
1809 // Writing an (integer) value to a boolean, byte, char or short field includes an implicit narrowing
1810 // conversion. Emit an explicit conversion here to get the correct field value after the write.
1811 BasicType bt = field->type()->basic_type();
1812 switch (bt) {
1813 case T_BOOLEAN:
1814 case T_BYTE:
1815 replacement = append(new Convert(Bytecodes::_i2b, replacement, as_ValueType(bt)));
1816 break;
1817 case T_CHAR:
1818 replacement = append(new Convert(Bytecodes::_i2c, replacement, as_ValueType(bt)));
1819 break;
1820 case T_SHORT:
1821 replacement = append(new Convert(Bytecodes::_i2s, replacement, as_ValueType(bt)));
1822 break;
1823 default:
1824 break;
1825 }
1826 push(type, replacement);
1827 } else {
1828 push(type, append(load));
1829 }
1830 }
1831 break;
1832 }
1833 case Bytecodes::_putfield: {
1834 Value val = pop(type);
1835 obj = apop();
1836 if (state_before == nullptr) {
1837 state_before = copy_state_for_exception();
1838 }
1839 if (field->type()->basic_type() == T_BOOLEAN) {
1840 Value mask = append(new Constant(new IntConstant(1)));
1841 val = append(new LogicOp(Bytecodes::_iand, val, mask));
1842 }
1843 StoreField* store = new StoreField(obj, offset, field, val, false, state_before, needs_patching);
1844 if (!needs_patching) store = _memory->store(store);
1845 if (store != nullptr) {
1846 append(store);
1847 }
1848 break;
1849 }
1850 default:
1851 ShouldNotReachHere();
1852 break;
1853 }
1854 }
1855
1856
1857 Dependencies* GraphBuilder::dependency_recorder() const {
1858 return compilation()->dependency_recorder();
1859 }
1860
1861 // How many arguments do we want to profile?
1862 Values* GraphBuilder::args_list_for_profiling(ciMethod* target, int& start, bool may_have_receiver) {
1863 int n = 0;
1864 bool has_receiver = may_have_receiver && Bytecodes::has_receiver(method()->java_code_at_bci(bci()));
1865 start = has_receiver ? 1 : 0;
1866 if (profile_arguments()) {
1867 ciProfileData* data = method()->method_data()->bci_to_data(bci());
1868 if (data != nullptr && (data->is_CallTypeData() || data->is_VirtualCallTypeData())) {
1869 n = data->is_CallTypeData() ? data->as_CallTypeData()->number_of_arguments() : data->as_VirtualCallTypeData()->number_of_arguments();
1870 }
1871 }
1872 // If we are inlining then we need to collect arguments to profile parameters for the target
1873 if (profile_parameters() && target != nullptr) {
1874 if (target->method_data() != nullptr && target->method_data()->parameters_type_data() != nullptr) {
1875 // The receiver is profiled on method entry so it's included in
1876 // the number of parameters but here we're only interested in
1952 break;
1953 case Bytecodes::_invokehandle:
1954 code = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokespecial;
1955 break;
1956 default:
1957 break;
1958 }
1959 } else {
1960 if (bc_raw == Bytecodes::_invokehandle) {
1961 assert(!will_link, "should come here only for unlinked call");
1962 code = Bytecodes::_invokespecial;
1963 }
1964 }
1965
1966 if (code == Bytecodes::_invokespecial) {
1967 // Additional receiver subtype checks for interface calls via invokespecial or invokeinterface.
1968 ciKlass* receiver_constraint = nullptr;
1969
1970 if (bc_raw == Bytecodes::_invokeinterface) {
1971 receiver_constraint = holder;
1972 } else if (bc_raw == Bytecodes::_invokespecial && !target->is_object_initializer() && calling_klass->is_interface()) {
1973 receiver_constraint = calling_klass;
1974 }
1975
1976 if (receiver_constraint != nullptr) {
1977 int index = state()->stack_size() - (target->arg_size_no_receiver() + 1);
1978 Value receiver = state()->stack_at(index);
1979 CheckCast* c = new CheckCast(receiver_constraint, receiver, copy_state_before());
1980 // go to uncommon_trap when checkcast fails
1981 c->set_invokespecial_receiver_check();
1982 state()->stack_at_put(index, append_split(c));
1983 }
1984 }
1985
1986 // Push appendix argument (MethodType, CallSite, etc.), if one.
1987 bool patch_for_appendix = false;
1988 int patching_appendix_arg = 0;
1989 if (Bytecodes::has_optional_appendix(bc_raw) && (!will_link || PatchALot)) {
1990 Value arg = append(new Constant(new ObjectConstant(compilation()->env()->unloaded_ciinstance()), copy_state_before()));
1991 apush(arg);
1992 patch_for_appendix = true;
2142 }
2143 } else {
2144 print_inlining(target, "no static binding", /*success*/ false);
2145 }
2146 } else {
2147 print_inlining(target, "not inlineable", /*success*/ false);
2148 }
2149
2150 // If we attempted an inline which did not succeed because of a
2151 // bailout during construction of the callee graph, the entire
2152 // compilation has to be aborted. This is fairly rare and currently
2153 // seems to only occur for jasm-generated classes which contain
2154 // jsr/ret pairs which are not associated with finally clauses and
2155 // do not have exception handlers in the containing method, and are
2156 // therefore not caught early enough to abort the inlining without
2157 // corrupting the graph. (We currently bail out with a non-empty
2158 // stack at a ret in these situations.)
2159 CHECK_BAILOUT();
2160
2161 // inlining not successful => standard invoke
2162 ValueType* result_type = as_ValueType(declared_signature->return_type());
2163 ValueStack* state_before = copy_state_exhandling();
2164
2165 // The bytecode (code) might change in this method so we are checking this very late.
2166 const bool has_receiver =
2167 code == Bytecodes::_invokespecial ||
2168 code == Bytecodes::_invokevirtual ||
2169 code == Bytecodes::_invokeinterface;
2170 Values* args = state()->pop_arguments(target->arg_size_no_receiver() + patching_appendix_arg);
2171 Value recv = has_receiver ? apop() : nullptr;
2172
2173 // A null check is required here (when there is a receiver) for any of the following cases
2174 // - invokespecial, always need a null check.
2175 // - invokevirtual, when the target is final and loaded. Calls to final targets will become optimized
2176 // and require null checking. If the target is loaded a null check is emitted here.
2177 // If the target isn't loaded the null check must happen after the call resolution. We achieve that
2178 // by using the target methods unverified entry point (see CompiledIC::compute_monomorphic_entry).
2179 // (The JVM specification requires that LinkageError must be thrown before a NPE. An unloaded target may
2180 // potentially fail, and can't have the null check before the resolution.)
2181 // - A call that will be profiled. (But we can't add a null check when the target is unloaded, by the same
2182 // reason as above, so calls with a receiver to unloaded targets can't be profiled.)
2191 null_check(recv);
2192 }
2193
2194 if (is_profiling()) {
2195 // Note that we'd collect profile data in this method if we wanted it.
2196 compilation()->set_would_profile(true);
2197
2198 if (profile_calls()) {
2199 assert(cha_monomorphic_target == nullptr || exact_target == nullptr, "both can not be set");
2200 ciKlass* target_klass = nullptr;
2201 if (cha_monomorphic_target != nullptr) {
2202 target_klass = cha_monomorphic_target->holder();
2203 } else if (exact_target != nullptr) {
2204 target_klass = exact_target->holder();
2205 }
2206 profile_call(target, recv, target_klass, collect_args_for_profiling(args, nullptr, false), false);
2207 }
2208 }
2209 }
2210
2211 Invoke* result = new Invoke(code, result_type, recv, args, target, state_before);
2212 // push result
2213 append_split(result);
2214
2215 if (result_type != voidType) {
2216 push(result_type, result);
2217 }
2218 if (profile_return() && result_type->is_object_kind()) {
2219 profile_return_type(result, target);
2220 }
2221 }
2222
2223
2224 void GraphBuilder::new_instance(int klass_index) {
2225 ValueStack* state_before = copy_state_exhandling();
2226 ciKlass* klass = stream()->get_klass();
2227 assert(klass->is_instance_klass(), "must be an instance klass");
2228 NewInstance* new_instance = new NewInstance(klass->as_instance_klass(), state_before, stream()->is_unresolved_klass());
2229 _memory->new_instance(new_instance);
2230 apush(append_split(new_instance));
2231 }
2232
2233
2234 void GraphBuilder::new_type_array() {
2235 ValueStack* state_before = copy_state_exhandling();
2236 apush(append_split(new NewTypeArray(ipop(), (BasicType)stream()->get_index(), state_before, true)));
2237 }
2238
2239
2240 void GraphBuilder::new_object_array() {
2241 ciKlass* klass = stream()->get_klass();
2242 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
2243 NewArray* n = new NewObjectArray(klass, ipop(), state_before);
2244 apush(append_split(n));
2245 }
2246
2247
2248 bool GraphBuilder::direct_compare(ciKlass* k) {
2249 if (k->is_loaded() && k->is_instance_klass() && !UseSlowPath) {
2250 ciInstanceKlass* ik = k->as_instance_klass();
2251 if (ik->is_final()) {
2252 return true;
2253 } else {
2286 ciKlass* klass = stream()->get_klass();
2287 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
2288 InstanceOf* i = new InstanceOf(klass, apop(), state_before);
2289 ipush(append_split(i));
2290 i->set_direct_compare(direct_compare(klass));
2291
2292 if (is_profiling()) {
2293 // Note that we'd collect profile data in this method if we wanted it.
2294 compilation()->set_would_profile(true);
2295
2296 if (profile_checkcasts()) {
2297 i->set_profiled_method(method());
2298 i->set_profiled_bci(bci());
2299 i->set_should_profile(true);
2300 }
2301 }
2302 }
2303
2304
2305 void GraphBuilder::monitorenter(Value x, int bci) {
2306 // save state before locking in case of deoptimization after a NullPointerException
2307 ValueStack* state_before = copy_state_for_exception_with_bci(bci);
2308 append_with_bci(new MonitorEnter(x, state()->lock(x), state_before), bci);
2309 kill_all();
2310 }
2311
2312
2313 void GraphBuilder::monitorexit(Value x, int bci) {
2314 append_with_bci(new MonitorExit(x, state()->unlock()), bci);
2315 kill_all();
2316 }
2317
2318
2319 void GraphBuilder::new_multi_array(int dimensions) {
2320 ciKlass* klass = stream()->get_klass();
2321 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
2322
2323 Values* dims = new Values(dimensions, dimensions, nullptr);
2324 // fill in all dimensions
2325 int i = dimensions;
2326 while (i-- > 0) dims->at_put(i, ipop());
2327 // create array
2328 NewArray* n = new NewMultiArray(klass, dims, state_before);
2413
2414 Instruction* GraphBuilder::append_split(StateSplit* instr) {
2415 return append_with_bci(instr, bci());
2416 }
2417
2418
2419 void GraphBuilder::null_check(Value value) {
2420 if (value->as_NewArray() != nullptr || value->as_NewInstance() != nullptr) {
2421 return;
2422 } else {
2423 Constant* con = value->as_Constant();
2424 if (con) {
2425 ObjectType* c = con->type()->as_ObjectType();
2426 if (c && c->is_loaded()) {
2427 ObjectConstant* oc = c->as_ObjectConstant();
2428 if (!oc || !oc->value()->is_null_object()) {
2429 return;
2430 }
2431 }
2432 }
2433 }
2434 append(new NullCheck(value, copy_state_for_exception()));
2435 }
2436
2437
2438
2439 XHandlers* GraphBuilder::handle_exception(Instruction* instruction) {
2440 if (!has_handler() && (!instruction->needs_exception_state() || instruction->exception_state() != nullptr)) {
2441 assert(instruction->exception_state() == nullptr
2442 || instruction->exception_state()->kind() == ValueStack::EmptyExceptionState
2443 || (instruction->exception_state()->kind() == ValueStack::ExceptionState && _compilation->env()->should_retain_local_variables()),
2444 "exception_state should be of exception kind");
2445 return new XHandlers();
2446 }
2447
2448 XHandlers* exception_handlers = new XHandlers();
2449 ScopeData* cur_scope_data = scope_data();
2450 ValueStack* cur_state = instruction->state_before();
2451 ValueStack* prev_state = nullptr;
2452 int scope_count = 0;
2453
2454 assert(cur_state != nullptr, "state_before must be set");
2455 do {
2456 int cur_bci = cur_state->bci();
2457 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match");
2458 assert(cur_bci == SynchronizationEntryBCI || cur_bci == cur_scope_data->stream()->cur_bci(), "invalid bci");
2459
2460 // join with all potential exception handlers
2461 XHandlers* list = cur_scope_data->xhandlers();
2462 const int n = list->length();
2463 for (int i = 0; i < n; i++) {
2464 XHandler* h = list->handler_at(i);
2465 if (h->covers(cur_bci)) {
2466 // h is a potential exception handler => join it
2467 compilation()->set_has_exception_handlers(true);
2468
2469 BlockBegin* entry = h->entry_block();
2470 if (entry == block()) {
2471 // It's acceptable for an exception handler to cover itself
2472 // but we don't handle that in the parser currently. It's
2473 // very rare so we bailout instead of trying to handle it.
2474 BAILOUT_("exception handler covers itself", exception_handlers);
2475 }
2476 assert(entry->bci() == h->handler_bci(), "must match");
2477 assert(entry->bci() == -1 || entry == cur_scope_data->block_at(entry->bci()), "blocks must correspond");
2478
3252 state->store_local(idx, new Local(type, vt, idx, false));
3253 idx += type->size();
3254 }
3255
3256 // lock synchronized method
3257 if (method()->is_synchronized()) {
3258 state->lock(nullptr);
3259 }
3260
3261 return state;
3262 }
3263
3264
3265 GraphBuilder::GraphBuilder(Compilation* compilation, IRScope* scope)
3266 : _scope_data(nullptr)
3267 , _compilation(compilation)
3268 , _memory(new MemoryBuffer())
3269 , _inline_bailout_msg(nullptr)
3270 , _instruction_count(0)
3271 , _osr_entry(nullptr)
3272 {
3273 int osr_bci = compilation->osr_bci();
3274
3275 // determine entry points and bci2block mapping
3276 BlockListBuilder blm(compilation, scope, osr_bci);
3277 CHECK_BAILOUT();
3278
3279 BlockList* bci2block = blm.bci2block();
3280 BlockBegin* start_block = bci2block->at(0);
3281
3282 push_root_scope(scope, bci2block, start_block);
3283
3284 // setup state for std entry
3285 _initial_state = state_at_entry();
3286 start_block->merge(_initial_state, compilation->has_irreducible_loops());
3287
3288 // End nulls still exist here
3289
3290 // complete graph
3291 _vmap = new ValueMap();
4004 // Temporarily set up bytecode stream so we can append instructions
4005 // (only using the bci of this stream)
4006 scope_data()->set_stream(scope_data()->parent()->stream());
4007
4008 // Pass parameters into callee state: add assignments
4009 // note: this will also ensure that all arguments are computed before being passed
4010 ValueStack* callee_state = state();
4011 ValueStack* caller_state = state()->caller_state();
4012 for (int i = args_base; i < caller_state->stack_size(); ) {
4013 const int arg_no = i - args_base;
4014 Value arg = caller_state->stack_at_inc(i);
4015 store_local(callee_state, arg, arg_no);
4016 }
4017
4018 // Remove args from stack.
4019 // Note that we preserve locals state in case we can use it later
4020 // (see use of pop_scope() below)
4021 caller_state->truncate_stack(args_base);
4022 assert(callee_state->stack_size() == 0, "callee stack must be empty");
4023
4024 Value lock = nullptr;
4025 BlockBegin* sync_handler = nullptr;
4026
4027 // Inline the locking of the receiver if the callee is synchronized
4028 if (callee->is_synchronized()) {
4029 lock = callee->is_static() ? append(new Constant(new InstanceConstant(callee->holder()->java_mirror())))
4030 : state()->local_at(0);
4031 sync_handler = new BlockBegin(SynchronizationEntryBCI);
4032 inline_sync_entry(lock, sync_handler);
4033 }
4034
4035 if (compilation()->env()->dtrace_method_probes()) {
4036 Values* args = new Values(1);
4037 args->push(append(new Constant(new MethodConstant(method()))));
4038 append(new RuntimeCall(voidType, "dtrace_method_entry", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), args));
4039 }
4040
4041 if (profile_inlined_calls()) {
4042 profile_invocation(callee, copy_state_before_with_bci(SynchronizationEntryBCI));
4043 }
|
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "c1/c1_Canonicalizer.hpp"
26 #include "c1/c1_CFGPrinter.hpp"
27 #include "c1/c1_Compilation.hpp"
28 #include "c1/c1_GraphBuilder.hpp"
29 #include "c1/c1_Instruction.hpp"
30 #include "c1/c1_InstructionPrinter.hpp"
31 #include "c1/c1_ValueType.hpp"
32 #include "ci/ciCallSite.hpp"
33 #include "ci/ciField.hpp"
34 #include "ci/ciFlatArrayKlass.hpp"
35 #include "ci/ciInlineKlass.hpp"
36 #include "ci/ciKlass.hpp"
37 #include "ci/ciMemberName.hpp"
38 #include "ci/ciSymbols.hpp"
39 #include "ci/ciUtilities.inline.hpp"
40 #include "classfile/javaClasses.hpp"
41 #include "compiler/compilationPolicy.hpp"
42 #include "compiler/compileBroker.hpp"
43 #include "compiler/compilerEvent.hpp"
44 #include "interpreter/bytecode.hpp"
45 #include "jfr/jfrEvents.hpp"
46 #include "memory/resourceArea.hpp"
47 #include "runtime/arguments.hpp"
48 #include "runtime/sharedRuntime.hpp"
49 #include "utilities/checkedCast.hpp"
50 #include "utilities/macros.hpp"
51 #if INCLUDE_JFR
52 #include "jfr/jfr.hpp"
53 #endif
54
55 class BlockListBuilder {
56 private:
57 Compilation* _compilation;
58 IRScope* _scope;
59
60 BlockList _blocks; // internal list of all blocks
61 BlockList* _bci2block; // mapping from bci to blocks for GraphBuilder
62 GrowableArray<BlockList> _bci2block_successors; // Mapping bcis to their blocks successors while we dont have a blockend
63
64 // fields used by mark_loops
65 ResourceBitMap _active; // for iteration of control flow graph
66 ResourceBitMap _visited; // for iteration of control flow graph
67 GrowableArray<ResourceBitMap> _loop_map; // caches the information if a block is contained in a loop
1033
1034 // Also check parent jsrs (if any) at this time to see whether
1035 // they are using this local. We don't handle skipping over a
1036 // ret.
1037 for (ScopeData* cur_scope_data = scope_data()->parent();
1038 cur_scope_data != nullptr && cur_scope_data->parsing_jsr() && cur_scope_data->scope() == scope();
1039 cur_scope_data = cur_scope_data->parent()) {
1040 if (cur_scope_data->jsr_return_address_local() == index) {
1041 BAILOUT("subroutine overwrites return address from previous subroutine");
1042 }
1043 }
1044 } else if (index == scope_data()->jsr_return_address_local()) {
1045 scope_data()->set_jsr_return_address_local(-1);
1046 }
1047 }
1048
1049 state->store_local(index, x);
1050 }
1051
1052
1053 ValueStack* GraphBuilder::state_before_for_indexed_access(BasicType type, int array_idx) {
1054 if (type == T_OBJECT && state()->stack_at(array_idx)->maybe_flat_array()) {
1055 // Save the entire state and re-execute on deopt when accessing flat arrays
1056 ValueStack* state_before = copy_state_before();
1057 state_before->set_should_reexecute(true);
1058 return state_before;
1059 }
1060 return copy_state_indexed_access();
1061 }
1062
1063 void GraphBuilder::load_indexed(BasicType type) {
1064 // In case of in block code motion in range check elimination
1065 int array_idx = state()->stack_size() - 2;
1066 ValueStack* state_before = state_before_for_indexed_access(type, array_idx);
1067 compilation()->set_has_access_indexed(true);
1068 Value index = ipop();
1069 Value array = apop();
1070 Value length = nullptr;
1071 if (CSEArrayLength ||
1072 (array->as_Constant() != nullptr) ||
1073 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) ||
1074 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant()) ||
1075 (array->as_NewMultiArray() && array->as_NewMultiArray()->dims()->at(0)->type()->is_constant())) {
1076 length = append(new ArrayLength(array, state_before));
1077 }
1078
1079 bool need_membar = false;
1080 LoadIndexed* load_indexed = nullptr;
1081 Instruction* result = nullptr;
1082 if (array->is_loaded_flat_array()) {
1083 ciType* array_type = array->declared_type();
1084 ciFlatArrayKlass* array_klass = array_type->as_flat_array_klass();
1085 ciInlineKlass* elem_klass = array_klass->element_klass()->as_inline_klass();
1086
1087 bool can_delay_access = false;
1088 ciBytecodeStream s(method());
1089 s.force_bci(bci());
1090 s.next();
1091 if (s.cur_bc() == Bytecodes::_getfield) {
1092 bool is_null_free = array_klass->is_elem_null_free();
1093 bool will_link;
1094 ciField* next_field = s.get_field(will_link);
1095 bool next_needs_patching = !next_field->holder()->is_initialized() ||
1096 !next_field->will_link(method(), Bytecodes::_getfield) ||
1097 PatchALot;
1098 bool needs_atomic_access = array_klass->is_elem_atomic();
1099 can_delay_access = is_null_free && C1UseDelayedFlattenedFieldReads &&
1100 !next_needs_patching && !needs_atomic_access;
1101 }
1102 if (can_delay_access) {
1103 // potentially optimizable array access, storing information for delayed decision
1104 LoadIndexed* li = new LoadIndexed(array, index, length, type, state_before);
1105 DelayedLoadIndexed* dli = new DelayedLoadIndexed(li, state_before);
1106 li->set_delayed(dli);
1107 set_pending_load_indexed(dli);
1108 return; // Nothing else to do for now
1109 } else {
1110 NewInstance* buffer = new NewInstance(elem_klass, state_before, false, true);
1111 buffer->set_null_free(true);
1112 _memory->new_instance(buffer);
1113 result = append_split(buffer);
1114 load_indexed = new LoadIndexed(array, index, length, type, state_before);
1115 load_indexed->set_buffer(buffer);
1116 // The LoadIndexed node will initialize this instance by copying from
1117 // the flat field. Ensure these stores are visible before any
1118 // subsequent store that publishes this reference.
1119 need_membar = true;
1120 }
1121 } else {
1122 load_indexed = new LoadIndexed(array, index, length, type, state_before);
1123 if (profile_array_accesses() && is_reference_type(type)) {
1124 compilation()->set_would_profile(true);
1125 load_indexed->set_should_profile(true);
1126 load_indexed->set_profiled_method(method());
1127 load_indexed->set_profiled_bci(bci());
1128 }
1129 }
1130 result = append(load_indexed);
1131 if (need_membar) {
1132 append(new MemBar(lir_membar_storestore));
1133 }
1134 assert(!load_indexed->should_profile() || load_indexed == result, "should not be optimized out");
1135 push(as_ValueType(type), result);
1136 }
1137
1138
1139 void GraphBuilder::store_indexed(BasicType type) {
1140 // In case of in block code motion in range check elimination
1141 int array_idx = state()->stack_size() - 3;
1142 ValueStack* state_before = state_before_for_indexed_access(type, array_idx);
1143 compilation()->set_has_access_indexed(true);
1144 Value value = pop(as_ValueType(type));
1145 Value index = ipop();
1146 Value array = apop();
1147 Value length = nullptr;
1148 if (CSEArrayLength ||
1149 (array->as_Constant() != nullptr) ||
1150 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) ||
1151 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant()) ||
1152 (array->as_NewMultiArray() && array->as_NewMultiArray()->dims()->at(0)->type()->is_constant())) {
1153 length = append(new ArrayLength(array, state_before));
1154 }
1155 ciType* array_type = array->declared_type();
1156 bool check_boolean = false;
1157 if (array_type != nullptr) {
1158 if (array_type->is_loaded() &&
1159 array_type->as_array_klass()->element_type()->basic_type() == T_BOOLEAN) {
1160 assert(type == T_BYTE, "boolean store uses bastore");
1161 Value mask = append(new Constant(new IntConstant(1)));
1162 value = append(new LogicOp(Bytecodes::_iand, value, mask));
1163 }
1164 } else if (type == T_BYTE) {
1165 check_boolean = true;
1166 }
1167
1168 StoreIndexed* store_indexed = new StoreIndexed(array, index, length, type, value, state_before, check_boolean);
1169 if (profile_array_accesses() && is_reference_type(type) && !array->is_loaded_flat_array()) {
1170 compilation()->set_would_profile(true);
1171 store_indexed->set_should_profile(true);
1172 store_indexed->set_profiled_method(method());
1173 store_indexed->set_profiled_bci(bci());
1174 }
1175 Instruction* result = append(store_indexed);
1176 assert(!store_indexed->should_profile() || store_indexed == result, "should not be optimized out");
1177 _memory->store_value(value);
1178 }
1179
1180 void GraphBuilder::stack_op(Bytecodes::Code code) {
1181 switch (code) {
1182 case Bytecodes::_pop:
1183 { state()->raw_pop();
1184 }
1185 break;
1186 case Bytecodes::_pop2:
1187 { state()->raw_pop();
1188 state()->raw_pop();
1189 }
1190 break;
1191 case Bytecodes::_dup:
1192 { Value w = state()->raw_pop();
1193 state()->raw_push(w);
1194 state()->raw_push(w);
1195 }
1196 break;
1197 case Bytecodes::_dup_x1:
1198 { Value w1 = state()->raw_pop();
1199 Value w2 = state()->raw_pop();
1344
1345
1346 void GraphBuilder::_goto(int from_bci, int to_bci) {
1347 Goto *x = new Goto(block_at(to_bci), to_bci <= from_bci);
1348 if (is_profiling()) {
1349 compilation()->set_would_profile(true);
1350 x->set_profiled_bci(bci());
1351 if (profile_branches()) {
1352 x->set_profiled_method(method());
1353 x->set_should_profile(true);
1354 }
1355 }
1356 append(x);
1357 }
1358
1359
1360 void GraphBuilder::if_node(Value x, If::Condition cond, Value y, ValueStack* state_before) {
1361 BlockBegin* tsux = block_at(stream()->get_dest());
1362 BlockBegin* fsux = block_at(stream()->next_bci());
1363 bool is_bb = tsux->bci() < stream()->cur_bci() || fsux->bci() < stream()->cur_bci();
1364
1365 bool subst_check = false;
1366 if (Arguments::is_valhalla_enabled() && (stream()->cur_bc() == Bytecodes::_if_acmpeq || stream()->cur_bc() == Bytecodes::_if_acmpne)) {
1367 ValueType* left_vt = x->type();
1368 ValueType* right_vt = y->type();
1369 if (left_vt->is_object()) {
1370 assert(right_vt->is_object(), "must be");
1371 ciKlass* left_klass = x->as_loaded_klass_or_null();
1372 ciKlass* right_klass = y->as_loaded_klass_or_null();
1373
1374 if (left_klass == nullptr || right_klass == nullptr) {
1375 // The klass is still unloaded, or came from a Phi node. Go slow case;
1376 subst_check = true;
1377 } else if (left_klass->can_be_inline_klass() || right_klass->can_be_inline_klass()) {
1378 // Either operand may be a value object, but we're not sure. Go slow case;
1379 subst_check = true;
1380 } else {
1381 // No need to do substitutability check
1382 }
1383 }
1384 }
1385 if ((stream()->cur_bc() == Bytecodes::_if_acmpeq || stream()->cur_bc() == Bytecodes::_if_acmpne) &&
1386 is_profiling() && profile_branches()) {
1387 compilation()->set_would_profile(true);
1388 append(new ProfileACmpTypes(method(), bci(), x, y));
1389 }
1390
1391 // In case of loop invariant code motion or predicate insertion
1392 // before the body of a loop the state is needed
1393 Instruction *i = append(new If(x, cond, false, y, tsux, fsux, (is_bb || compilation()->is_optimistic() || subst_check) ? state_before : nullptr, is_bb, subst_check));
1394
1395 assert(i->as_Goto() == nullptr ||
1396 (i->as_Goto()->sux_at(0) == tsux && i->as_Goto()->is_safepoint() == (tsux->bci() < stream()->cur_bci())) ||
1397 (i->as_Goto()->sux_at(0) == fsux && i->as_Goto()->is_safepoint() == (fsux->bci() < stream()->cur_bci())),
1398 "safepoint state of Goto returned by canonicalizer incorrect");
1399
1400 if (is_profiling()) {
1401 If* if_node = i->as_If();
1402 if (if_node != nullptr) {
1403 // Note that we'd collect profile data in this method if we wanted it.
1404 compilation()->set_would_profile(true);
1405 // At level 2 we need the proper bci to count backedges
1406 if_node->set_profiled_bci(bci());
1407 if (profile_branches()) {
1408 // Successors can be rotated by the canonicalizer, check for this case.
1409 if_node->set_profiled_method(method());
1410 if_node->set_should_profile(true);
1411 if (if_node->tsux() == fsux) {
1412 if_node->set_swapped(true);
1413 }
1628 }
1629
1630 if (needs_check) {
1631 // Perform the registration of finalizable objects.
1632 ValueStack* state_before = copy_state_for_exception();
1633 load_local(objectType, 0);
1634 append_split(new Intrinsic(voidType, vmIntrinsics::_Object_init,
1635 state()->pop_arguments(1),
1636 true, state_before, true));
1637 }
1638 }
1639
1640
1641 void GraphBuilder::method_return(Value x, bool ignore_return) {
1642 if (method()->intrinsic_id() == vmIntrinsics::_Object_init) {
1643 call_register_finalizer();
1644 }
1645
1646 // The conditions for a memory barrier are described in Parse::do_exits().
1647 bool need_mem_bar = false;
1648 if (method()->is_object_constructor() &&
1649 (scope()->wrote_non_strict_final() || scope()->wrote_stable() ||
1650 (AlwaysSafeConstructors && scope()->wrote_fields()) ||
1651 (support_IRIW_for_not_multiple_copy_atomic_cpu && scope()->wrote_volatile()))) {
1652 need_mem_bar = true;
1653 }
1654
1655 BasicType bt = method()->return_type()->basic_type();
1656 switch (bt) {
1657 case T_BYTE:
1658 {
1659 Value shift = append(new Constant(new IntConstant(24)));
1660 x = append(new ShiftOp(Bytecodes::_ishl, x, shift));
1661 x = append(new ShiftOp(Bytecodes::_ishr, x, shift));
1662 break;
1663 }
1664 case T_SHORT:
1665 {
1666 Value shift = append(new Constant(new IntConstant(16)));
1667 x = append(new ShiftOp(Bytecodes::_ishl, x, shift));
1668 x = append(new ShiftOp(Bytecodes::_ishr, x, shift));
1669 break;
1779 // Attach dimension info to stable arrays.
1780 if (FoldStableValues &&
1781 field->is_stable() && field_type == T_ARRAY && !field_value.is_null_or_zero()) {
1782 ciArray* array = field_value.as_object()->as_array();
1783 jint dimension = field->type()->as_array_klass()->dimension();
1784 value = new StableArrayConstant(array, dimension);
1785 }
1786
1787 switch (field_type) {
1788 case T_ARRAY:
1789 case T_OBJECT:
1790 if (field_value.as_object()->should_be_constant()) {
1791 return new Constant(value);
1792 }
1793 return nullptr; // Not a constant.
1794 default:
1795 return new Constant(value);
1796 }
1797 }
1798
1799 void GraphBuilder::copy_inline_content(ciInlineKlass* vk, Value src, int src_off, Value dest, int dest_off, ValueStack* state_before, ciField* enclosing_field) {
1800 for (int i = 0; i < vk->nof_declared_nonstatic_fields(); i++) {
1801 ciField* field = vk->declared_nonstatic_field_at(i);
1802 int offset = field->offset_in_bytes() - vk->payload_offset();
1803 if (field->is_flat()) {
1804 copy_inline_content(field->type()->as_inline_klass(), src, src_off + offset, dest, dest_off + offset, state_before, enclosing_field);
1805 if (!field->is_null_free()) {
1806 // Nullable, copy the null marker using Unsafe because null markers are not real fields
1807 int null_marker_offset = field->null_marker_offset() - vk->payload_offset();
1808 Value offset = append(new Constant(new LongConstant(src_off + null_marker_offset)));
1809 Value nm = append(new UnsafeGet(T_BOOLEAN, src, offset, false));
1810 offset = append(new Constant(new LongConstant(dest_off + null_marker_offset)));
1811 append(new UnsafePut(T_BOOLEAN, dest, offset, nm, false));
1812 }
1813 } else {
1814 Value value = append(new LoadField(src, src_off + offset, field, false, state_before, false));
1815 StoreField* store = new StoreField(dest, dest_off + offset, field, value, false, state_before, false);
1816 store->set_enclosing_field(enclosing_field);
1817 append(store);
1818 }
1819 }
1820 }
1821
1822 void GraphBuilder::access_field(Bytecodes::Code code) {
1823 bool will_link;
1824 ciField* field = stream()->get_field(will_link);
1825 ciInstanceKlass* holder = field->holder();
1826 BasicType field_basic_type = field->type()->basic_type();
1827 ValueType* type = as_ValueType(field_basic_type);
1828
1829 // call will_link again to determine if the field is valid.
1830 const bool needs_patching = !holder->is_loaded() ||
1831 !field->will_link(method(), code) ||
1832 (!field->is_flat() && PatchALot);
1833
1834 ValueStack* state_before = nullptr;
1835 if (!holder->is_initialized() || needs_patching) {
1836 // save state before instruction for debug info when
1837 // deoptimization happens during patching
1838 state_before = copy_state_before();
1839 }
1840
1841 Value obj = nullptr;
1842 if (code == Bytecodes::_getstatic || code == Bytecodes::_putstatic) {
1843 if (state_before != nullptr) {
1844 // build a patching constant
1845 obj = new Constant(new InstanceConstant(holder->java_mirror()), state_before);
1846 } else {
1847 obj = new Constant(new InstanceConstant(holder->java_mirror()));
1848 }
1849 }
1850
1851 if (code == Bytecodes::_putfield) {
1852 scope()->set_wrote_fields();
1853 if (field->is_volatile()) {
1854 scope()->set_wrote_volatile();
1855 }
1856 if (field->is_final() && !field->is_strict()) {
1857 scope()->set_wrote_non_strict_final();
1858 }
1859 if (field->is_stable()) {
1860 scope()->set_wrote_stable();
1861 }
1862 }
1863
1864 int offset = !needs_patching ? field->offset_in_bytes() : -1;
1865 switch (code) {
1866 case Bytecodes::_getstatic: {
1867 // check for compile-time constants, i.e., initialized static final fields
1868 Value constant = nullptr;
1869 if (field->is_static_constant() && !PatchALot) {
1870 ciConstant field_value = field->constant_value();
1871 assert(!field->is_stable() || !field_value.is_null_or_zero(),
1872 "stable static w/ default value shouldn't be a constant");
1873 constant = make_constant(field_value, field);
1874 }
1875 if (constant != nullptr) {
1876 push(type, append(constant));
1877 } else {
1878 if (state_before == nullptr) {
1879 state_before = copy_state_for_exception();
1880 }
1881 LoadField* load_field = new LoadField(append(obj), offset, field, true,
1882 state_before, needs_patching);
1883 push(type, append(load_field));
1884 }
1885 break;
1886 }
1887 case Bytecodes::_putstatic: {
1888 Value val = pop(type);
1889 if (state_before == nullptr) {
1890 state_before = copy_state_for_exception();
1891 }
1892 if (field_basic_type == T_BOOLEAN) {
1893 Value mask = append(new Constant(new IntConstant(1)));
1894 val = append(new LogicOp(Bytecodes::_iand, val, mask));
1895 }
1896 if (field->is_null_free()) {
1897 null_check(val);
1898
1899 ciType* field_type = field->type();
1900 if (field_type->is_loaded() && field->empty_null_free_initialized_value_field(!method()->is_class_initializer())) {
1901 // Storing to an empty, null-free inline type field that is already initialized. Ignore.
1902 break;
1903 }
1904 }
1905 append(new StoreField(append(obj), offset, field, val, true, state_before, needs_patching));
1906 break;
1907 }
1908 case Bytecodes::_getfield: {
1909 // Check for compile-time constants, i.e., trusted final non-static fields.
1910 Value constant = nullptr;
1911 if (state_before == nullptr && field->is_flat()) {
1912 // Save the entire state and re-execute on deopt when accessing flat fields
1913 assert(Interpreter::bytecode_should_reexecute(code), "should reexecute");
1914 state_before = copy_state_before();
1915 }
1916 if (!has_pending_field_access() && !has_pending_load_indexed()) {
1917 obj = apop();
1918 ObjectType* obj_type = obj->type()->as_ObjectType();
1919 if (field->is_constant() && !field->is_flat() && obj_type->is_constant() && !PatchALot) {
1920 ciObject* const_oop = obj_type->constant_value();
1921 if (!const_oop->is_null_object() && const_oop->is_loaded()) {
1922 ciConstant field_value = field->constant_value_of(const_oop);
1923 if (field_value.is_valid()) {
1924 constant = make_constant(field_value, field);
1925 // For CallSite objects add a dependency for invalidation of the optimization.
1926 if (field->is_call_site_target()) {
1927 ciCallSite* call_site = const_oop->as_call_site();
1928 if (!call_site->is_fully_initialized_constant_call_site()) {
1929 ciMethodHandle* target = field_value.as_object()->as_method_handle();
1930 dependency_recorder()->assert_call_site_target_value(call_site, target);
1931 }
1932 }
1933 }
1934 }
1935 }
1936 }
1937 if (constant != nullptr) {
1938 push(type, append(constant));
1939 } else {
1940 if (state_before == nullptr) {
1941 state_before = copy_state_for_exception();
1942 }
1943 if (!field->is_flat()) {
1944 if (has_pending_field_access()) {
1945 assert(!needs_patching, "Can't patch delayed field access");
1946 obj = pending_field_access()->obj();
1947 offset += pending_field_access()->offset() - field->holder()->as_inline_klass()->payload_offset();
1948 field = pending_field_access()->holder()->get_field_by_offset(offset, false);
1949 assert(field != nullptr, "field not found");
1950 set_pending_field_access(nullptr);
1951 } else if (has_pending_load_indexed()) {
1952 assert(!needs_patching, "Can't patch delayed field access");
1953 pending_load_indexed()->update(field, offset - field->holder()->as_inline_klass()->payload_offset());
1954 LoadIndexed* li = pending_load_indexed()->load_instr();
1955 li->set_type(type);
1956 push(type, append(li));
1957 set_pending_load_indexed(nullptr);
1958 break;
1959 }
1960 LoadField* load = new LoadField(obj, offset, field, false, state_before, needs_patching);
1961 Value replacement = !needs_patching ? _memory->load(load) : load;
1962 if (replacement != load) {
1963 assert(replacement->is_linked() || !replacement->can_be_linked(), "should already be linked");
1964 // Writing an (integer) value to a boolean, byte, char or short field includes an implicit narrowing
1965 // conversion. Emit an explicit conversion here to get the correct field value after the write.
1966 switch (field_basic_type) {
1967 case T_BOOLEAN:
1968 case T_BYTE:
1969 replacement = append(new Convert(Bytecodes::_i2b, replacement, type));
1970 break;
1971 case T_CHAR:
1972 replacement = append(new Convert(Bytecodes::_i2c, replacement, type));
1973 break;
1974 case T_SHORT:
1975 replacement = append(new Convert(Bytecodes::_i2s, replacement, type));
1976 break;
1977 default:
1978 break;
1979 }
1980 push(type, replacement);
1981 } else {
1982 push(type, append(load));
1983 }
1984 } else {
1985 // Flat field
1986 assert(!needs_patching, "Can't patch flat inline type field access");
1987 ciInlineKlass* inline_klass = field->type()->as_inline_klass();
1988 if (field->is_atomic()) {
1989 assert(!has_pending_field_access(), "Pending field accesses are not supported");
1990 LoadField* load = new LoadField(obj, offset, field, false, state_before, needs_patching);
1991 push(type, append(load));
1992 } else {
1993 // Look at the next bytecode to check if we can delay the field access
1994 bool can_delay_access = false;
1995 if (field->is_null_free()) {
1996 ciBytecodeStream s(method());
1997 s.force_bci(bci());
1998 s.next();
1999 if (s.cur_bc() == Bytecodes::_getfield && !needs_patching) {
2000 ciField* next_field = s.get_field(will_link);
2001 bool next_needs_patching = !next_field->holder()->is_loaded() ||
2002 !next_field->will_link(method(), Bytecodes::_getfield) ||
2003 PatchALot;
2004 // We can't update the offset for atomic accesses
2005 bool next_needs_atomic_access = next_field->is_flat() && next_field->is_atomic();
2006 can_delay_access = C1UseDelayedFlattenedFieldReads && !next_needs_patching && !next_needs_atomic_access && next_field->is_null_free();
2007 }
2008 }
2009
2010 if (can_delay_access) {
2011 // Flat fields contain the nested value's payload but not its object header,
2012 // so accumulate the field offset relative to the holder's payload.
2013 if (has_pending_load_indexed()) {
2014 pending_load_indexed()->update(field, offset - field->holder()->as_inline_klass()->payload_offset());
2015 } else if (has_pending_field_access()) {
2016 pending_field_access()->inc_offset(offset - field->holder()->as_inline_klass()->payload_offset());
2017 } else {
2018 null_check(obj);
2019 DelayedFieldAccess* dfa = new DelayedFieldAccess(obj, field->holder(), field->offset_in_bytes(), state_before);
2020 set_pending_field_access(dfa);
2021 }
2022 } else {
2023 if (!field->is_strict()) {
2024 scope()->set_wrote_non_strict_final();
2025 }
2026 scope()->set_wrote_fields();
2027 if (has_pending_load_indexed()) {
2028 assert(field->is_null_free(), "nullable fields do not support delayed accesses yet");
2029 assert(!needs_patching, "Can't patch delayed field access");
2030 pending_load_indexed()->update(field, offset - field->holder()->as_inline_klass()->payload_offset());
2031 NewInstance* buffer = new NewInstance(inline_klass, pending_load_indexed()->state_before(), false, true);
2032 buffer->set_null_free(true);
2033 _memory->new_instance(buffer);
2034 pending_load_indexed()->load_instr()->set_buffer(buffer);
2035 apush(append_split(buffer));
2036 append(pending_load_indexed()->load_instr());
2037 set_pending_load_indexed(nullptr);
2038 } else if (has_pending_field_access()) {
2039 assert(field->is_null_free(), "nullable fields do not support delayed accesses yet");
2040 state_before = pending_field_access()->state_before();
2041 NewInstance* buffer = new NewInstance(inline_klass, state_before, false, true);
2042 _memory->new_instance(buffer);
2043 apush(append_split(buffer));
2044 copy_inline_content(inline_klass, pending_field_access()->obj(),
2045 pending_field_access()->offset() + field->offset_in_bytes() - field->holder()->as_inline_klass()->payload_offset(),
2046 buffer, inline_klass->payload_offset(), state_before);
2047 set_pending_field_access(nullptr);
2048 } else {
2049 if (!field->is_null_free() && !inline_klass->is_initialized()) {
2050 // Cannot allocate an instance of inline_klass because it may have not been
2051 // initialized, bailout for now
2052 bailout("load from an uninitialized nullable non-atomic flat field");
2053 return;
2054 }
2055
2056 NewInstance* buffer = new NewInstance(inline_klass, state_before, false, true);
2057 _memory->new_instance(buffer);
2058 append_split(buffer);
2059
2060 if (inline_klass->is_initialized() && inline_klass->is_empty()) {
2061 // Needs an explicit null check because below code does not perform any actual load if there are no fields
2062 null_check(obj);
2063 }
2064 copy_inline_content(inline_klass, obj, field->offset_in_bytes(), buffer, inline_klass->payload_offset(), state_before);
2065
2066 Instruction* result = buffer;
2067 if (!field->is_null_free()) {
2068 Value int_zero = append(new Constant(intZero));
2069 Value object_null = append(new Constant(objectNull));
2070 Value nm_offset = append(new Constant(new LongConstant(offset + inline_klass->null_marker_offset_in_payload())));
2071 Value nm = append(new UnsafeGet(T_BOOLEAN, obj, nm_offset, false));
2072 result = append(new IfOp(nm, Instruction::neq, int_zero, buffer, object_null, state_before, false));
2073 }
2074 apush(result);
2075 }
2076
2077 // If we allocated a new instance ensure the stores to copy the
2078 // field contents are visible before any subsequent store that
2079 // publishes this reference.
2080 append(new MemBar(lir_membar_storestore));
2081 }
2082 }
2083 }
2084 }
2085 break;
2086 }
2087 case Bytecodes::_putfield: {
2088 Value val = pop(type);
2089 obj = apop();
2090 if (state_before == nullptr) {
2091 state_before = copy_state_for_exception();
2092 }
2093 if (field_basic_type == T_BOOLEAN) {
2094 Value mask = append(new Constant(new IntConstant(1)));
2095 val = append(new LogicOp(Bytecodes::_iand, val, mask));
2096 }
2097
2098 ciType* field_type = field->type();
2099 if (field_type->is_loaded() && field->empty_null_free_initialized_value_field(!method()->is_object_constructor())) {
2100 // Storing to an empty, null-free inline type field that is already initialized. Ignore.
2101 null_check(obj);
2102 null_check(val);
2103 } else if (!field->is_flat()) {
2104 if (field->is_null_free()) {
2105 null_check(val);
2106 }
2107 StoreField* store = new StoreField(obj, offset, field, val, false, state_before, needs_patching);
2108 if (!needs_patching) store = _memory->store(store);
2109 if (store != nullptr) {
2110 append(store);
2111 }
2112 } else {
2113 // Flat field
2114 assert(!needs_patching, "Can't patch flat inline type field access");
2115 ciInlineKlass* inline_klass = field_type->as_inline_klass();
2116 if (field->is_atomic()) {
2117 if (field->is_null_free()) {
2118 null_check(val);
2119 }
2120 append(new StoreField(obj, offset, field, val, false, state_before, needs_patching));
2121 } else if (field->is_null_free()) {
2122 assert(!inline_klass->is_empty(), "should have been handled");
2123 copy_inline_content(inline_klass, val, inline_klass->payload_offset(), obj, offset, state_before, field);
2124 } else {
2125 if (!inline_klass->is_initialized()) {
2126 // null_reset_value is not available, bailout for now
2127 bailout("store to an uninitialized nullable non-atomic flat field");
2128 return;
2129 }
2130
2131 // Store the subfields when field is a nullable non-atomic field
2132 Value object_null = append(new Constant(objectNull));
2133 Value null_reset_value = append(new Constant(new ObjectConstant(inline_klass->get_null_reset_value().as_object())));
2134 Value src = append(new IfOp(val, Instruction::neq, object_null, val, null_reset_value, state_before, false));
2135 copy_inline_content(inline_klass, src, inline_klass->payload_offset(), obj, offset, state_before);
2136
2137 // Store the null marker
2138 Value int_one = append(new Constant(new IntConstant(1)));
2139 Value int_zero = append(new Constant(intZero));
2140 Value nm = append(new IfOp(val, Instruction::neq, object_null, int_one, int_zero, state_before, false));
2141 Value nm_offset = append(new Constant(new LongConstant(offset + inline_klass->null_marker_offset_in_payload())));
2142 append(new UnsafePut(T_BOOLEAN, obj, nm_offset, nm, false));
2143 }
2144 }
2145 break;
2146 }
2147 default:
2148 ShouldNotReachHere();
2149 break;
2150 }
2151 }
2152
2153 Dependencies* GraphBuilder::dependency_recorder() const {
2154 return compilation()->dependency_recorder();
2155 }
2156
2157 // How many arguments do we want to profile?
2158 Values* GraphBuilder::args_list_for_profiling(ciMethod* target, int& start, bool may_have_receiver) {
2159 int n = 0;
2160 bool has_receiver = may_have_receiver && Bytecodes::has_receiver(method()->java_code_at_bci(bci()));
2161 start = has_receiver ? 1 : 0;
2162 if (profile_arguments()) {
2163 ciProfileData* data = method()->method_data()->bci_to_data(bci());
2164 if (data != nullptr && (data->is_CallTypeData() || data->is_VirtualCallTypeData())) {
2165 n = data->is_CallTypeData() ? data->as_CallTypeData()->number_of_arguments() : data->as_VirtualCallTypeData()->number_of_arguments();
2166 }
2167 }
2168 // If we are inlining then we need to collect arguments to profile parameters for the target
2169 if (profile_parameters() && target != nullptr) {
2170 if (target->method_data() != nullptr && target->method_data()->parameters_type_data() != nullptr) {
2171 // The receiver is profiled on method entry so it's included in
2172 // the number of parameters but here we're only interested in
2248 break;
2249 case Bytecodes::_invokehandle:
2250 code = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokespecial;
2251 break;
2252 default:
2253 break;
2254 }
2255 } else {
2256 if (bc_raw == Bytecodes::_invokehandle) {
2257 assert(!will_link, "should come here only for unlinked call");
2258 code = Bytecodes::_invokespecial;
2259 }
2260 }
2261
2262 if (code == Bytecodes::_invokespecial) {
2263 // Additional receiver subtype checks for interface calls via invokespecial or invokeinterface.
2264 ciKlass* receiver_constraint = nullptr;
2265
2266 if (bc_raw == Bytecodes::_invokeinterface) {
2267 receiver_constraint = holder;
2268 } else if (bc_raw == Bytecodes::_invokespecial && !target->is_object_constructor() && calling_klass->is_interface()) {
2269 receiver_constraint = calling_klass;
2270 }
2271
2272 if (receiver_constraint != nullptr) {
2273 int index = state()->stack_size() - (target->arg_size_no_receiver() + 1);
2274 Value receiver = state()->stack_at(index);
2275 CheckCast* c = new CheckCast(receiver_constraint, receiver, copy_state_before());
2276 // go to uncommon_trap when checkcast fails
2277 c->set_invokespecial_receiver_check();
2278 state()->stack_at_put(index, append_split(c));
2279 }
2280 }
2281
2282 // Push appendix argument (MethodType, CallSite, etc.), if one.
2283 bool patch_for_appendix = false;
2284 int patching_appendix_arg = 0;
2285 if (Bytecodes::has_optional_appendix(bc_raw) && (!will_link || PatchALot)) {
2286 Value arg = append(new Constant(new ObjectConstant(compilation()->env()->unloaded_ciinstance()), copy_state_before()));
2287 apush(arg);
2288 patch_for_appendix = true;
2438 }
2439 } else {
2440 print_inlining(target, "no static binding", /*success*/ false);
2441 }
2442 } else {
2443 print_inlining(target, "not inlineable", /*success*/ false);
2444 }
2445
2446 // If we attempted an inline which did not succeed because of a
2447 // bailout during construction of the callee graph, the entire
2448 // compilation has to be aborted. This is fairly rare and currently
2449 // seems to only occur for jasm-generated classes which contain
2450 // jsr/ret pairs which are not associated with finally clauses and
2451 // do not have exception handlers in the containing method, and are
2452 // therefore not caught early enough to abort the inlining without
2453 // corrupting the graph. (We currently bail out with a non-empty
2454 // stack at a ret in these situations.)
2455 CHECK_BAILOUT();
2456
2457 // inlining not successful => standard invoke
2458 ciType* return_type = declared_signature->return_type();
2459 ValueStack* state_before = copy_state_exhandling();
2460
2461 // The bytecode (code) might change in this method so we are checking this very late.
2462 const bool has_receiver =
2463 code == Bytecodes::_invokespecial ||
2464 code == Bytecodes::_invokevirtual ||
2465 code == Bytecodes::_invokeinterface;
2466 Values* args = state()->pop_arguments(target->arg_size_no_receiver() + patching_appendix_arg);
2467 Value recv = has_receiver ? apop() : nullptr;
2468
2469 // A null check is required here (when there is a receiver) for any of the following cases
2470 // - invokespecial, always need a null check.
2471 // - invokevirtual, when the target is final and loaded. Calls to final targets will become optimized
2472 // and require null checking. If the target is loaded a null check is emitted here.
2473 // If the target isn't loaded the null check must happen after the call resolution. We achieve that
2474 // by using the target methods unverified entry point (see CompiledIC::compute_monomorphic_entry).
2475 // (The JVM specification requires that LinkageError must be thrown before a NPE. An unloaded target may
2476 // potentially fail, and can't have the null check before the resolution.)
2477 // - A call that will be profiled. (But we can't add a null check when the target is unloaded, by the same
2478 // reason as above, so calls with a receiver to unloaded targets can't be profiled.)
2487 null_check(recv);
2488 }
2489
2490 if (is_profiling()) {
2491 // Note that we'd collect profile data in this method if we wanted it.
2492 compilation()->set_would_profile(true);
2493
2494 if (profile_calls()) {
2495 assert(cha_monomorphic_target == nullptr || exact_target == nullptr, "both can not be set");
2496 ciKlass* target_klass = nullptr;
2497 if (cha_monomorphic_target != nullptr) {
2498 target_klass = cha_monomorphic_target->holder();
2499 } else if (exact_target != nullptr) {
2500 target_klass = exact_target->holder();
2501 }
2502 profile_call(target, recv, target_klass, collect_args_for_profiling(args, nullptr, false), false);
2503 }
2504 }
2505 }
2506
2507 Invoke* result = new Invoke(code, return_type, recv, args, target, state_before);
2508 // push result
2509 append_split(result);
2510
2511 if (!return_type->is_void()) {
2512 push(as_ValueType(return_type), result);
2513 }
2514
2515 if (profile_return() && return_type->is_object()) {
2516 profile_return_type(result, target);
2517 }
2518 }
2519
2520
2521 void GraphBuilder::new_instance(int klass_index) {
2522 ValueStack* state_before = copy_state_exhandling();
2523 ciKlass* klass = stream()->get_klass();
2524 assert(klass->is_instance_klass(), "must be an instance klass");
2525 NewInstance* new_instance = new NewInstance(klass->as_instance_klass(), state_before, stream()->is_unresolved_klass(), false);
2526 _memory->new_instance(new_instance);
2527 apush(append_split(new_instance));
2528 }
2529
2530 void GraphBuilder::new_type_array() {
2531 ValueStack* state_before = copy_state_exhandling();
2532 apush(append_split(new NewTypeArray(ipop(), (BasicType)stream()->get_index(), state_before, true)));
2533 }
2534
2535
2536 void GraphBuilder::new_object_array() {
2537 ciKlass* klass = stream()->get_klass();
2538 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
2539 NewArray* n = new NewObjectArray(klass, ipop(), state_before);
2540 apush(append_split(n));
2541 }
2542
2543
2544 bool GraphBuilder::direct_compare(ciKlass* k) {
2545 if (k->is_loaded() && k->is_instance_klass() && !UseSlowPath) {
2546 ciInstanceKlass* ik = k->as_instance_klass();
2547 if (ik->is_final()) {
2548 return true;
2549 } else {
2582 ciKlass* klass = stream()->get_klass();
2583 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
2584 InstanceOf* i = new InstanceOf(klass, apop(), state_before);
2585 ipush(append_split(i));
2586 i->set_direct_compare(direct_compare(klass));
2587
2588 if (is_profiling()) {
2589 // Note that we'd collect profile data in this method if we wanted it.
2590 compilation()->set_would_profile(true);
2591
2592 if (profile_checkcasts()) {
2593 i->set_profiled_method(method());
2594 i->set_profiled_bci(bci());
2595 i->set_should_profile(true);
2596 }
2597 }
2598 }
2599
2600
2601 void GraphBuilder::monitorenter(Value x, int bci) {
2602 bool maybe_inlinetype = false;
2603 if (bci == InvocationEntryBci) {
2604 // Called by GraphBuilder::inline_sync_entry.
2605 #ifdef ASSERT
2606 ciType* obj_type = x->declared_type();
2607 assert(obj_type == nullptr || !obj_type->is_inlinetype(), "inline types cannot have synchronized methods");
2608 #endif
2609 } else {
2610 // We are compiling a monitorenter bytecode
2611 if (Arguments::is_valhalla_enabled()) {
2612 ciType* obj_type = x->declared_type();
2613 if (obj_type == nullptr || obj_type->can_be_inline_klass()) {
2614 // If we're (possibly) locking on an inline type, check for markWord::always_locked_pattern
2615 // and throw IMSE. (obj_type is null for Phi nodes, so let's just be conservative).
2616 maybe_inlinetype = true;
2617 }
2618 }
2619 }
2620
2621 // save state before locking in case of deoptimization after a NullPointerException
2622 ValueStack* state_before = copy_state_for_exception_with_bci(bci);
2623 append_with_bci(new MonitorEnter(x, state()->lock(x), state_before, maybe_inlinetype), bci);
2624 kill_all();
2625 }
2626
2627
2628 void GraphBuilder::monitorexit(Value x, int bci) {
2629 append_with_bci(new MonitorExit(x, state()->unlock()), bci);
2630 kill_all();
2631 }
2632
2633
2634 void GraphBuilder::new_multi_array(int dimensions) {
2635 ciKlass* klass = stream()->get_klass();
2636 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
2637
2638 Values* dims = new Values(dimensions, dimensions, nullptr);
2639 // fill in all dimensions
2640 int i = dimensions;
2641 while (i-- > 0) dims->at_put(i, ipop());
2642 // create array
2643 NewArray* n = new NewMultiArray(klass, dims, state_before);
2728
2729 Instruction* GraphBuilder::append_split(StateSplit* instr) {
2730 return append_with_bci(instr, bci());
2731 }
2732
2733
2734 void GraphBuilder::null_check(Value value) {
2735 if (value->as_NewArray() != nullptr || value->as_NewInstance() != nullptr) {
2736 return;
2737 } else {
2738 Constant* con = value->as_Constant();
2739 if (con) {
2740 ObjectType* c = con->type()->as_ObjectType();
2741 if (c && c->is_loaded()) {
2742 ObjectConstant* oc = c->as_ObjectConstant();
2743 if (!oc || !oc->value()->is_null_object()) {
2744 return;
2745 }
2746 }
2747 }
2748 if (value->is_null_free()) return;
2749 }
2750 append(new NullCheck(value, copy_state_for_exception()));
2751 }
2752
2753
2754
2755 XHandlers* GraphBuilder::handle_exception(Instruction* instruction) {
2756 if (!has_handler() && (!instruction->needs_exception_state() || instruction->exception_state() != nullptr)) {
2757 assert(instruction->exception_state() == nullptr
2758 || instruction->exception_state()->kind() == ValueStack::EmptyExceptionState
2759 || (instruction->exception_state()->kind() == ValueStack::ExceptionState && _compilation->env()->should_retain_local_variables()),
2760 "exception_state should be of exception kind");
2761 return new XHandlers();
2762 }
2763
2764 XHandlers* exception_handlers = new XHandlers();
2765 ScopeData* cur_scope_data = scope_data();
2766 ValueStack* cur_state = instruction->state_before();
2767 ValueStack* prev_state = nullptr;
2768 int scope_count = 0;
2769
2770 assert(cur_state != nullptr, "state_before must be set");
2771 do {
2772 int cur_bci = cur_state->bci();
2773 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match");
2774 assert(cur_bci == SynchronizationEntryBCI || cur_bci == cur_scope_data->stream()->cur_bci()
2775 || has_pending_field_access() || has_pending_load_indexed(), "invalid bci");
2776
2777
2778 // join with all potential exception handlers
2779 XHandlers* list = cur_scope_data->xhandlers();
2780 const int n = list->length();
2781 for (int i = 0; i < n; i++) {
2782 XHandler* h = list->handler_at(i);
2783 if (h->covers(cur_bci)) {
2784 // h is a potential exception handler => join it
2785 compilation()->set_has_exception_handlers(true);
2786
2787 BlockBegin* entry = h->entry_block();
2788 if (entry == block()) {
2789 // It's acceptable for an exception handler to cover itself
2790 // but we don't handle that in the parser currently. It's
2791 // very rare so we bailout instead of trying to handle it.
2792 BAILOUT_("exception handler covers itself", exception_handlers);
2793 }
2794 assert(entry->bci() == h->handler_bci(), "must match");
2795 assert(entry->bci() == -1 || entry == cur_scope_data->block_at(entry->bci()), "blocks must correspond");
2796
3570 state->store_local(idx, new Local(type, vt, idx, false));
3571 idx += type->size();
3572 }
3573
3574 // lock synchronized method
3575 if (method()->is_synchronized()) {
3576 state->lock(nullptr);
3577 }
3578
3579 return state;
3580 }
3581
3582
3583 GraphBuilder::GraphBuilder(Compilation* compilation, IRScope* scope)
3584 : _scope_data(nullptr)
3585 , _compilation(compilation)
3586 , _memory(new MemoryBuffer())
3587 , _inline_bailout_msg(nullptr)
3588 , _instruction_count(0)
3589 , _osr_entry(nullptr)
3590 , _pending_field_access(nullptr)
3591 , _pending_load_indexed(nullptr)
3592 {
3593 int osr_bci = compilation->osr_bci();
3594
3595 // determine entry points and bci2block mapping
3596 BlockListBuilder blm(compilation, scope, osr_bci);
3597 CHECK_BAILOUT();
3598
3599 BlockList* bci2block = blm.bci2block();
3600 BlockBegin* start_block = bci2block->at(0);
3601
3602 push_root_scope(scope, bci2block, start_block);
3603
3604 // setup state for std entry
3605 _initial_state = state_at_entry();
3606 start_block->merge(_initial_state, compilation->has_irreducible_loops());
3607
3608 // End nulls still exist here
3609
3610 // complete graph
3611 _vmap = new ValueMap();
4324 // Temporarily set up bytecode stream so we can append instructions
4325 // (only using the bci of this stream)
4326 scope_data()->set_stream(scope_data()->parent()->stream());
4327
4328 // Pass parameters into callee state: add assignments
4329 // note: this will also ensure that all arguments are computed before being passed
4330 ValueStack* callee_state = state();
4331 ValueStack* caller_state = state()->caller_state();
4332 for (int i = args_base; i < caller_state->stack_size(); ) {
4333 const int arg_no = i - args_base;
4334 Value arg = caller_state->stack_at_inc(i);
4335 store_local(callee_state, arg, arg_no);
4336 }
4337
4338 // Remove args from stack.
4339 // Note that we preserve locals state in case we can use it later
4340 // (see use of pop_scope() below)
4341 caller_state->truncate_stack(args_base);
4342 assert(callee_state->stack_size() == 0, "callee stack must be empty");
4343
4344 // Check if we need a membar at the beginning of the java.lang.Object
4345 // constructor to satisfy the memory model for strict fields.
4346 if (Arguments::is_valhalla_enabled() && method()->intrinsic_id() == vmIntrinsics::_Object_init) {
4347 Value receiver = state()->local_at(0);
4348 ciType* klass = receiver->exact_type();
4349 if (klass == nullptr) {
4350 // No exact type, check if the declared type has no implementors and add a dependency
4351 klass = receiver->declared_type();
4352 klass = compilation()->cha_exact_type(klass);
4353 }
4354 if (klass != nullptr && klass->is_instance_klass()) {
4355 // Exact receiver type, check if there is a strict field
4356 ciInstanceKlass* holder = klass->as_instance_klass();
4357 for (int i = 0; i < holder->nof_nonstatic_fields(); i++) {
4358 ciField* field = holder->nonstatic_field_at(i);
4359 if (field->is_strict()) {
4360 // Found a strict field, a membar is needed
4361 append(new MemBar(lir_membar_storestore));
4362 break;
4363 }
4364 }
4365 } else if (klass == nullptr) {
4366 // We can't statically determine the type of the receiver and therefore need
4367 // to put a membar here because it could have a strict field.
4368 append(new MemBar(lir_membar_storestore));
4369 }
4370 }
4371
4372 Value lock = nullptr;
4373 BlockBegin* sync_handler = nullptr;
4374
4375 // Inline the locking of the receiver if the callee is synchronized
4376 if (callee->is_synchronized()) {
4377 lock = callee->is_static() ? append(new Constant(new InstanceConstant(callee->holder()->java_mirror())))
4378 : state()->local_at(0);
4379 sync_handler = new BlockBegin(SynchronizationEntryBCI);
4380 inline_sync_entry(lock, sync_handler);
4381 }
4382
4383 if (compilation()->env()->dtrace_method_probes()) {
4384 Values* args = new Values(1);
4385 args->push(append(new Constant(new MethodConstant(method()))));
4386 append(new RuntimeCall(voidType, "dtrace_method_entry", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), args));
4387 }
4388
4389 if (profile_inlined_calls()) {
4390 profile_invocation(callee, copy_state_before_with_bci(SynchronizationEntryBCI));
4391 }
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