1 /*
2 * Copyright (c) 1999, 2025, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
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
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 }
|
1 /*
2 * Copyright (c) 1999, 2026, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
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
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 void GraphBuilder::load_indexed(BasicType type) {
1054 // In case of in block code motion in range check elimination
1055 ValueStack* state_before = nullptr;
1056 int array_idx = state()->stack_size() - 2;
1057 if (type == T_OBJECT && state()->stack_at(array_idx)->maybe_flat_array()) {
1058 // Save the entire state and re-execute on deopt when accessing flat arrays
1059 state_before = copy_state_before();
1060 state_before->set_should_reexecute(true);
1061 } else {
1062 state_before = copy_state_indexed_access();
1063 }
1064 compilation()->set_has_access_indexed(true);
1065 Value index = ipop();
1066 Value array = apop();
1067 Value length = nullptr;
1068 if (CSEArrayLength ||
1069 (array->as_Constant() != nullptr) ||
1070 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) ||
1071 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant()) ||
1072 (array->as_NewMultiArray() && array->as_NewMultiArray()->dims()->at(0)->type()->is_constant())) {
1073 length = append(new ArrayLength(array, state_before));
1074 }
1075
1076 bool need_membar = false;
1077 LoadIndexed* load_indexed = nullptr;
1078 Instruction* result = nullptr;
1079 if (array->is_loaded_flat_array()) {
1080 ciType* array_type = array->declared_type();
1081 ciFlatArrayKlass* array_klass = array_type->as_flat_array_klass();
1082 ciInlineKlass* elem_klass = array_klass->element_klass()->as_inline_klass();
1083
1084 bool can_delay_access = false;
1085 ciBytecodeStream s(method());
1086 s.force_bci(bci());
1087 s.next();
1088 if (s.cur_bc() == Bytecodes::_getfield) {
1089 bool is_null_free = array_klass->is_elem_null_free();
1090 bool will_link;
1091 ciField* next_field = s.get_field(will_link);
1092 bool next_needs_patching = !next_field->holder()->is_initialized() ||
1093 !next_field->will_link(method(), Bytecodes::_getfield) ||
1094 PatchALot;
1095 bool needs_atomic_access = array_klass->is_elem_atomic();
1096 can_delay_access = is_null_free && C1UseDelayedFlattenedFieldReads &&
1097 !next_needs_patching && !needs_atomic_access;
1098 }
1099 if (can_delay_access) {
1100 // potentially optimizable array access, storing information for delayed decision
1101 LoadIndexed* li = new LoadIndexed(array, index, length, type, state_before);
1102 DelayedLoadIndexed* dli = new DelayedLoadIndexed(li, state_before);
1103 li->set_delayed(dli);
1104 set_pending_load_indexed(dli);
1105 return; // Nothing else to do for now
1106 } else {
1107 NewInstance* buffer = new NewInstance(elem_klass, state_before, false, true);
1108 buffer->set_null_free(true);
1109 _memory->new_instance(buffer);
1110 result = append_split(buffer);
1111 load_indexed = new LoadIndexed(array, index, length, type, state_before);
1112 load_indexed->set_buffer(buffer);
1113 // The LoadIndexed node will initialize this instance by copying from
1114 // the flat field. Ensure these stores are visible before any
1115 // subsequent store that publishes this reference.
1116 need_membar = true;
1117 }
1118 } else {
1119 load_indexed = new LoadIndexed(array, index, length, type, state_before);
1120 if (profile_array_accesses() && is_reference_type(type)) {
1121 compilation()->set_would_profile(true);
1122 load_indexed->set_should_profile(true);
1123 load_indexed->set_profiled_method(method());
1124 load_indexed->set_profiled_bci(bci());
1125 }
1126 }
1127 result = append(load_indexed);
1128 if (need_membar) {
1129 append(new MemBar(lir_membar_storestore));
1130 }
1131 assert(!load_indexed->should_profile() || load_indexed == result, "should not be optimized out");
1132 push(as_ValueType(type), result);
1133 }
1134
1135
1136 void GraphBuilder::store_indexed(BasicType type) {
1137 // In case of in block code motion in range check elimination
1138 ValueStack* state_before = nullptr;
1139 int array_idx = state()->stack_size() - 3;
1140 if (type == T_OBJECT && state()->stack_at(array_idx)->maybe_flat_array()) {
1141 // Save the entire state and re-execute on deopt when accessing flat arrays
1142 state_before = copy_state_before();
1143 state_before->set_should_reexecute(true);
1144 } else {
1145 state_before = copy_state_indexed_access();
1146 }
1147 compilation()->set_has_access_indexed(true);
1148 Value value = pop(as_ValueType(type));
1149 Value index = ipop();
1150 Value array = apop();
1151 Value length = nullptr;
1152 if (CSEArrayLength ||
1153 (array->as_Constant() != nullptr) ||
1154 (array->as_AccessField() && array->as_AccessField()->field()->is_constant()) ||
1155 (array->as_NewArray() && array->as_NewArray()->length() && array->as_NewArray()->length()->type()->is_constant()) ||
1156 (array->as_NewMultiArray() && array->as_NewMultiArray()->dims()->at(0)->type()->is_constant())) {
1157 length = append(new ArrayLength(array, state_before));
1158 }
1159 ciType* array_type = array->declared_type();
1160 bool check_boolean = false;
1161 if (array_type != nullptr) {
1162 if (array_type->is_loaded() &&
1163 array_type->as_array_klass()->element_type()->basic_type() == T_BOOLEAN) {
1164 assert(type == T_BYTE, "boolean store uses bastore");
1165 Value mask = append(new Constant(new IntConstant(1)));
1166 value = append(new LogicOp(Bytecodes::_iand, value, mask));
1167 }
1168 } else if (type == T_BYTE) {
1169 check_boolean = true;
1170 }
1171
1172 StoreIndexed* store_indexed = new StoreIndexed(array, index, length, type, value, state_before, check_boolean);
1173 if (profile_array_accesses() && is_reference_type(type) && !array->is_loaded_flat_array()) {
1174 compilation()->set_would_profile(true);
1175 store_indexed->set_should_profile(true);
1176 store_indexed->set_profiled_method(method());
1177 store_indexed->set_profiled_bci(bci());
1178 }
1179 Instruction* result = append(store_indexed);
1180 assert(!store_indexed->should_profile() || store_indexed == result, "should not be optimized out");
1181 _memory->store_value(value);
1182 }
1183
1184 void GraphBuilder::stack_op(Bytecodes::Code code) {
1185 switch (code) {
1186 case Bytecodes::_pop:
1187 { state()->raw_pop();
1188 }
1189 break;
1190 case Bytecodes::_pop2:
1191 { state()->raw_pop();
1192 state()->raw_pop();
1193 }
1194 break;
1195 case Bytecodes::_dup:
1196 { Value w = state()->raw_pop();
1197 state()->raw_push(w);
1198 state()->raw_push(w);
1199 }
1200 break;
1201 case Bytecodes::_dup_x1:
1202 { Value w1 = state()->raw_pop();
1203 Value w2 = state()->raw_pop();
1348
1349
1350 void GraphBuilder::_goto(int from_bci, int to_bci) {
1351 Goto *x = new Goto(block_at(to_bci), to_bci <= from_bci);
1352 if (is_profiling()) {
1353 compilation()->set_would_profile(true);
1354 x->set_profiled_bci(bci());
1355 if (profile_branches()) {
1356 x->set_profiled_method(method());
1357 x->set_should_profile(true);
1358 }
1359 }
1360 append(x);
1361 }
1362
1363
1364 void GraphBuilder::if_node(Value x, If::Condition cond, Value y, ValueStack* state_before) {
1365 BlockBegin* tsux = block_at(stream()->get_dest());
1366 BlockBegin* fsux = block_at(stream()->next_bci());
1367 bool is_bb = tsux->bci() < stream()->cur_bci() || fsux->bci() < stream()->cur_bci();
1368
1369 bool subst_check = false;
1370 if (Arguments::is_valhalla_enabled() && (stream()->cur_bc() == Bytecodes::_if_acmpeq || stream()->cur_bc() == Bytecodes::_if_acmpne)) {
1371 ValueType* left_vt = x->type();
1372 ValueType* right_vt = y->type();
1373 if (left_vt->is_object()) {
1374 assert(right_vt->is_object(), "must be");
1375 ciKlass* left_klass = x->as_loaded_klass_or_null();
1376 ciKlass* right_klass = y->as_loaded_klass_or_null();
1377
1378 if (left_klass == nullptr || right_klass == nullptr) {
1379 // The klass is still unloaded, or came from a Phi node. Go slow case;
1380 subst_check = true;
1381 } else if (left_klass->can_be_inline_klass() || right_klass->can_be_inline_klass()) {
1382 // Either operand may be a value object, but we're not sure. Go slow case;
1383 subst_check = true;
1384 } else {
1385 // No need to do substitutability check
1386 }
1387 }
1388 }
1389 if ((stream()->cur_bc() == Bytecodes::_if_acmpeq || stream()->cur_bc() == Bytecodes::_if_acmpne) &&
1390 is_profiling() && profile_branches()) {
1391 compilation()->set_would_profile(true);
1392 append(new ProfileACmpTypes(method(), bci(), x, y));
1393 }
1394
1395 // In case of loop invariant code motion or predicate insertion
1396 // before the body of a loop the state is needed
1397 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));
1398
1399 assert(i->as_Goto() == nullptr ||
1400 (i->as_Goto()->sux_at(0) == tsux && i->as_Goto()->is_safepoint() == (tsux->bci() < stream()->cur_bci())) ||
1401 (i->as_Goto()->sux_at(0) == fsux && i->as_Goto()->is_safepoint() == (fsux->bci() < stream()->cur_bci())),
1402 "safepoint state of Goto returned by canonicalizer incorrect");
1403
1404 if (is_profiling()) {
1405 If* if_node = i->as_If();
1406 if (if_node != nullptr) {
1407 // Note that we'd collect profile data in this method if we wanted it.
1408 compilation()->set_would_profile(true);
1409 // At level 2 we need the proper bci to count backedges
1410 if_node->set_profiled_bci(bci());
1411 if (profile_branches()) {
1412 // Successors can be rotated by the canonicalizer, check for this case.
1413 if_node->set_profiled_method(method());
1414 if_node->set_should_profile(true);
1415 if (if_node->tsux() == fsux) {
1416 if_node->set_swapped(true);
1417 }
1632 }
1633
1634 if (needs_check) {
1635 // Perform the registration of finalizable objects.
1636 ValueStack* state_before = copy_state_for_exception();
1637 load_local(objectType, 0);
1638 append_split(new Intrinsic(voidType, vmIntrinsics::_Object_init,
1639 state()->pop_arguments(1),
1640 true, state_before, true));
1641 }
1642 }
1643
1644
1645 void GraphBuilder::method_return(Value x, bool ignore_return) {
1646 if (method()->intrinsic_id() == vmIntrinsics::_Object_init) {
1647 call_register_finalizer();
1648 }
1649
1650 // The conditions for a memory barrier are described in Parse::do_exits().
1651 bool need_mem_bar = false;
1652 if (method()->is_object_constructor() &&
1653 (scope()->wrote_non_strict_final() || scope()->wrote_stable() ||
1654 (AlwaysSafeConstructors && scope()->wrote_fields()) ||
1655 (support_IRIW_for_not_multiple_copy_atomic_cpu && scope()->wrote_volatile()))) {
1656 need_mem_bar = true;
1657 }
1658
1659 BasicType bt = method()->return_type()->basic_type();
1660 switch (bt) {
1661 case T_BYTE:
1662 {
1663 Value shift = append(new Constant(new IntConstant(24)));
1664 x = append(new ShiftOp(Bytecodes::_ishl, x, shift));
1665 x = append(new ShiftOp(Bytecodes::_ishr, x, shift));
1666 break;
1667 }
1668 case T_SHORT:
1669 {
1670 Value shift = append(new Constant(new IntConstant(16)));
1671 x = append(new ShiftOp(Bytecodes::_ishl, x, shift));
1672 x = append(new ShiftOp(Bytecodes::_ishr, x, shift));
1673 break;
1783 // Attach dimension info to stable arrays.
1784 if (FoldStableValues &&
1785 field->is_stable() && field_type == T_ARRAY && !field_value.is_null_or_zero()) {
1786 ciArray* array = field_value.as_object()->as_array();
1787 jint dimension = field->type()->as_array_klass()->dimension();
1788 value = new StableArrayConstant(array, dimension);
1789 }
1790
1791 switch (field_type) {
1792 case T_ARRAY:
1793 case T_OBJECT:
1794 if (field_value.as_object()->should_be_constant()) {
1795 return new Constant(value);
1796 }
1797 return nullptr; // Not a constant.
1798 default:
1799 return new Constant(value);
1800 }
1801 }
1802
1803 void GraphBuilder::copy_inline_content(ciInlineKlass* vk, Value src, int src_off, Value dest, int dest_off, ValueStack* state_before, ciField* enclosing_field) {
1804 for (int i = 0; i < vk->nof_declared_nonstatic_fields(); i++) {
1805 ciField* field = vk->declared_nonstatic_field_at(i);
1806 int offset = field->offset_in_bytes() - vk->payload_offset();
1807 if (field->is_flat()) {
1808 copy_inline_content(field->type()->as_inline_klass(), src, src_off + offset, dest, dest_off + offset, state_before, enclosing_field);
1809 if (!field->is_null_free()) {
1810 // Nullable, copy the null marker using Unsafe because null markers are no real fields
1811 int null_marker_offset = field->null_marker_offset() - vk->payload_offset();
1812 Value offset = append(new Constant(new LongConstant(src_off + null_marker_offset)));
1813 Value nm = append(new UnsafeGet(T_BOOLEAN, src, offset, false));
1814 offset = append(new Constant(new LongConstant(dest_off + null_marker_offset)));
1815 append(new UnsafePut(T_BOOLEAN, dest, offset, nm, false));
1816 }
1817 } else {
1818 Value value = append(new LoadField(src, src_off + offset, field, false, state_before, false));
1819 StoreField* store = new StoreField(dest, dest_off + offset, field, value, false, state_before, false);
1820 store->set_enclosing_field(enclosing_field);
1821 append(store);
1822 }
1823 }
1824 }
1825
1826 void GraphBuilder::access_field(Bytecodes::Code code) {
1827 bool will_link;
1828 ciField* field = stream()->get_field(will_link);
1829 ciInstanceKlass* holder = field->holder();
1830 BasicType field_basic_type = field->type()->basic_type();
1831 ValueType* type = as_ValueType(field_basic_type);
1832
1833 // call will_link again to determine if the field is valid.
1834 const bool needs_patching = !holder->is_loaded() ||
1835 !field->will_link(method(), code) ||
1836 (!field->is_flat() && PatchALot);
1837
1838 ValueStack* state_before = nullptr;
1839 if (!holder->is_initialized() || needs_patching) {
1840 // save state before instruction for debug info when
1841 // deoptimization happens during patching
1842 state_before = copy_state_before();
1843 }
1844
1845 Value obj = nullptr;
1846 if (code == Bytecodes::_getstatic || code == Bytecodes::_putstatic) {
1847 if (state_before != nullptr) {
1848 // build a patching constant
1849 obj = new Constant(new InstanceConstant(holder->java_mirror()), state_before);
1850 } else {
1851 obj = new Constant(new InstanceConstant(holder->java_mirror()));
1852 }
1853 }
1854
1855 if (code == Bytecodes::_putfield) {
1856 scope()->set_wrote_fields();
1857 if (field->is_volatile()) {
1858 scope()->set_wrote_volatile();
1859 }
1860 if (field->is_final() && !field->is_strict()) {
1861 scope()->set_wrote_non_strict_final();
1862 }
1863 if (field->is_stable()) {
1864 scope()->set_wrote_stable();
1865 }
1866 }
1867
1868 int offset = !needs_patching ? field->offset_in_bytes() : -1;
1869 switch (code) {
1870 case Bytecodes::_getstatic: {
1871 // check for compile-time constants, i.e., initialized static final fields
1872 Value constant = nullptr;
1873 if (field->is_static_constant() && !PatchALot) {
1874 ciConstant field_value = field->constant_value();
1875 assert(!field->is_stable() || !field_value.is_null_or_zero(),
1876 "stable static w/ default value shouldn't be a constant");
1877 constant = make_constant(field_value, field);
1878 }
1879 if (constant != nullptr) {
1880 push(type, append(constant));
1881 } else {
1882 if (state_before == nullptr) {
1883 state_before = copy_state_for_exception();
1884 }
1885 LoadField* load_field = new LoadField(append(obj), offset, field, true,
1886 state_before, needs_patching);
1887 push(type, append(load_field));
1888 }
1889 break;
1890 }
1891 case Bytecodes::_putstatic: {
1892 Value val = pop(type);
1893 if (state_before == nullptr) {
1894 state_before = copy_state_for_exception();
1895 }
1896 if (field_basic_type == T_BOOLEAN) {
1897 Value mask = append(new Constant(new IntConstant(1)));
1898 val = append(new LogicOp(Bytecodes::_iand, val, mask));
1899 }
1900 if (field->is_null_free()) {
1901 null_check(val);
1902
1903 ciType* field_type = field->type();
1904 if (field_type->is_loaded() && field_type->is_inlinetype() && field_type->as_inline_klass()->is_empty() &&
1905 (!method()->is_class_initializer() || field->is_flat())) {
1906 // Storing to a field of an empty, null-free inline type that is already initialized. Ignore.
1907 break;
1908 }
1909 }
1910 append(new StoreField(append(obj), offset, field, val, true, state_before, needs_patching));
1911 break;
1912 }
1913 case Bytecodes::_getfield: {
1914 // Check for compile-time constants, i.e., trusted final non-static fields.
1915 Value constant = nullptr;
1916 if (state_before == nullptr && field->is_flat()) {
1917 // Save the entire state and re-execute on deopt when accessing flat fields
1918 assert(Interpreter::bytecode_should_reexecute(code), "should reexecute");
1919 state_before = copy_state_before();
1920 }
1921 if (!has_pending_field_access() && !has_pending_load_indexed()) {
1922 obj = apop();
1923 ObjectType* obj_type = obj->type()->as_ObjectType();
1924 if (field->is_constant() && !field->is_flat() && obj_type->is_constant() && !PatchALot) {
1925 ciObject* const_oop = obj_type->constant_value();
1926 if (!const_oop->is_null_object() && const_oop->is_loaded()) {
1927 ciConstant field_value = field->constant_value_of(const_oop);
1928 if (field_value.is_valid()) {
1929 constant = make_constant(field_value, field);
1930 // For CallSite objects add a dependency for invalidation of the optimization.
1931 if (field->is_call_site_target()) {
1932 ciCallSite* call_site = const_oop->as_call_site();
1933 if (!call_site->is_fully_initialized_constant_call_site()) {
1934 ciMethodHandle* target = field_value.as_object()->as_method_handle();
1935 dependency_recorder()->assert_call_site_target_value(call_site, target);
1936 }
1937 }
1938 }
1939 }
1940 }
1941 }
1942 if (constant != nullptr) {
1943 push(type, append(constant));
1944 } else {
1945 if (state_before == nullptr) {
1946 state_before = copy_state_for_exception();
1947 }
1948 if (!field->is_flat()) {
1949 if (has_pending_field_access()) {
1950 assert(!needs_patching, "Can't patch delayed field access");
1951 obj = pending_field_access()->obj();
1952 offset += pending_field_access()->offset() - field->holder()->as_inline_klass()->payload_offset();
1953 field = pending_field_access()->holder()->get_field_by_offset(offset, false);
1954 assert(field != nullptr, "field not found");
1955 set_pending_field_access(nullptr);
1956 } else if (has_pending_load_indexed()) {
1957 assert(!needs_patching, "Can't patch delayed field access");
1958 pending_load_indexed()->update(field, offset - field->holder()->as_inline_klass()->payload_offset());
1959 LoadIndexed* li = pending_load_indexed()->load_instr();
1960 li->set_type(type);
1961 push(type, append(li));
1962 set_pending_load_indexed(nullptr);
1963 break;
1964 }
1965 LoadField* load = new LoadField(obj, offset, field, false, state_before, needs_patching);
1966 Value replacement = !needs_patching ? _memory->load(load) : load;
1967 if (replacement != load) {
1968 assert(replacement->is_linked() || !replacement->can_be_linked(), "should already by linked");
1969 // Writing an (integer) value to a boolean, byte, char or short field includes an implicit narrowing
1970 // conversion. Emit an explicit conversion here to get the correct field value after the write.
1971 switch (field_basic_type) {
1972 case T_BOOLEAN:
1973 case T_BYTE:
1974 replacement = append(new Convert(Bytecodes::_i2b, replacement, type));
1975 break;
1976 case T_CHAR:
1977 replacement = append(new Convert(Bytecodes::_i2c, replacement, type));
1978 break;
1979 case T_SHORT:
1980 replacement = append(new Convert(Bytecodes::_i2s, replacement, type));
1981 break;
1982 default:
1983 break;
1984 }
1985 push(type, replacement);
1986 } else {
1987 push(type, append(load));
1988 }
1989 } else {
1990 // Flat field
1991 assert(!needs_patching, "Can't patch flat inline type field access");
1992 ciInlineKlass* inline_klass = field->type()->as_inline_klass();
1993 if (field->is_atomic()) {
1994 assert(!has_pending_field_access(), "Pending field accesses are not supported");
1995 LoadField* load = new LoadField(obj, offset, field, false, state_before, needs_patching);
1996 push(type, append(load));
1997 } else {
1998 // Look at the next bytecode to check if we can delay the field access
1999 bool can_delay_access = false;
2000 if (field->is_null_free()) {
2001 ciBytecodeStream s(method());
2002 s.force_bci(bci());
2003 s.next();
2004 if (s.cur_bc() == Bytecodes::_getfield && !needs_patching) {
2005 ciField* next_field = s.get_field(will_link);
2006 bool next_needs_patching = !next_field->holder()->is_loaded() ||
2007 !next_field->will_link(method(), Bytecodes::_getfield) ||
2008 PatchALot;
2009 // We can't update the offset for atomic accesses
2010 bool next_needs_atomic_access = next_field->is_flat() && next_field->is_atomic();
2011 can_delay_access = C1UseDelayedFlattenedFieldReads && !next_needs_patching && !next_needs_atomic_access && next_field->is_null_free();
2012 }
2013 }
2014
2015 if (can_delay_access) {
2016 if (has_pending_load_indexed()) {
2017 pending_load_indexed()->update(field, offset - field->holder()->as_inline_klass()->payload_offset());
2018 } else if (has_pending_field_access()) {
2019 pending_field_access()->inc_offset(offset - field->holder()->as_inline_klass()->payload_offset());
2020 } else {
2021 null_check(obj);
2022 DelayedFieldAccess* dfa = new DelayedFieldAccess(obj, field->holder(), field->offset_in_bytes(), state_before);
2023 set_pending_field_access(dfa);
2024 }
2025 } else {
2026 if (!field->is_strict()) {
2027 scope()->set_wrote_non_strict_final();
2028 }
2029 scope()->set_wrote_fields();
2030 if (has_pending_load_indexed()) {
2031 assert(field->is_null_free(), "nullable fields do not support delayed accesses yet");
2032 assert(!needs_patching, "Can't patch delayed field access");
2033 pending_load_indexed()->update(field, offset - field->holder()->as_inline_klass()->payload_offset());
2034 NewInstance* buffer = new NewInstance(inline_klass, pending_load_indexed()->state_before(), false, true);
2035 buffer->set_null_free(true);
2036 _memory->new_instance(buffer);
2037 pending_load_indexed()->load_instr()->set_buffer(buffer);
2038 apush(append_split(buffer));
2039 append(pending_load_indexed()->load_instr());
2040 set_pending_load_indexed(nullptr);
2041 } else if (has_pending_field_access()) {
2042 assert(field->is_null_free(), "nullable fields do not support delayed accesses yet");
2043 state_before = pending_field_access()->state_before();
2044 NewInstance* buffer = new NewInstance(inline_klass, state_before, false, true);
2045 _memory->new_instance(buffer);
2046 apush(append_split(buffer));
2047 copy_inline_content(inline_klass, pending_field_access()->obj(),
2048 pending_field_access()->offset() + field->offset_in_bytes() - field->holder()->as_inline_klass()->payload_offset(),
2049 buffer, inline_klass->payload_offset(), state_before);
2050 set_pending_field_access(nullptr);
2051 } else {
2052 if (!field->is_null_free() && !inline_klass->is_initialized()) {
2053 // Cannot allocate an instance of inline_klass because it may have not been
2054 // initialized, bailout for now
2055 bailout("load from an uninitialized nullable non-atomic flat field");
2056 return;
2057 }
2058
2059 NewInstance* buffer = new NewInstance(inline_klass, state_before, false, true);
2060 _memory->new_instance(buffer);
2061 append_split(buffer);
2062
2063 if (inline_klass->is_initialized() && inline_klass->is_empty()) {
2064 // Needs an explicit null check because below code does not perform any actual load if there are no fields
2065 null_check(obj);
2066 }
2067 copy_inline_content(inline_klass, obj, field->offset_in_bytes(), buffer, inline_klass->payload_offset(), state_before);
2068
2069 Instruction* result = buffer;
2070 if (!field->is_null_free()) {
2071 Value int_zero = append(new Constant(intZero));
2072 Value object_null = append(new Constant(objectNull));
2073 Value nm_offset = append(new Constant(new LongConstant(offset + inline_klass->null_marker_offset_in_payload())));
2074 Value nm = append(new UnsafeGet(T_BOOLEAN, obj, nm_offset, false));
2075 result = append(new IfOp(nm, Instruction::neq, int_zero, buffer, object_null, state_before, false));
2076 }
2077 apush(result);
2078 }
2079
2080 // If we allocated a new instance ensure the stores to copy the
2081 // field contents are visible before any subsequent store that
2082 // publishes this reference.
2083 append(new MemBar(lir_membar_storestore));
2084 }
2085 }
2086 }
2087 }
2088 break;
2089 }
2090 case Bytecodes::_putfield: {
2091 Value val = pop(type);
2092 obj = apop();
2093 if (state_before == nullptr) {
2094 state_before = copy_state_for_exception();
2095 }
2096 if (field_basic_type == T_BOOLEAN) {
2097 Value mask = append(new Constant(new IntConstant(1)));
2098 val = append(new LogicOp(Bytecodes::_iand, val, mask));
2099 }
2100
2101 ciType* field_type = field->type();
2102 if (field->is_null_free() && field_type->is_loaded() && field_type->is_inlinetype() &&
2103 field_type->as_inline_klass()->is_empty() && (!method()->is_object_constructor() || field->is_flat())) {
2104 // Storing to a field of an empty, null-free inline type that is already initialized. Ignore.
2105 null_check(obj);
2106 null_check(val);
2107 } else if (!field->is_flat()) {
2108 if (field->is_null_free()) {
2109 null_check(val);
2110 }
2111 StoreField* store = new StoreField(obj, offset, field, val, false, state_before, needs_patching);
2112 if (!needs_patching) store = _memory->store(store);
2113 if (store != nullptr) {
2114 append(store);
2115 }
2116 } else {
2117 // Flat field
2118 assert(!needs_patching, "Can't patch flat inline type field access");
2119 ciInlineKlass* inline_klass = field_type->as_inline_klass();
2120 if (field->is_atomic()) {
2121 if (field->is_null_free()) {
2122 null_check(val);
2123 }
2124 append(new StoreField(obj, offset, field, val, false, state_before, needs_patching));
2125 } else if (field->is_null_free()) {
2126 assert(!inline_klass->is_empty(), "should have been handled");
2127 copy_inline_content(inline_klass, val, inline_klass->payload_offset(), obj, offset, state_before, field);
2128 } else {
2129 if (!inline_klass->is_initialized()) {
2130 // null_reset_value is not available, bailout for now
2131 bailout("store to an uninitialized nullable non-atomic flat field");
2132 return;
2133 }
2134
2135 // Store the subfields when field is a nullable non-atomic field
2136 Value object_null = append(new Constant(objectNull));
2137 Value null_reset_value = append(new Constant(new ObjectConstant(inline_klass->get_null_reset_value().as_object())));
2138 Value src = append(new IfOp(val, Instruction::neq, object_null, val, null_reset_value, state_before, false));
2139 copy_inline_content(inline_klass, src, inline_klass->payload_offset(), obj, offset, state_before);
2140
2141 // Store the null marker
2142 Value int_one = append(new Constant(new IntConstant(1)));
2143 Value int_zero = append(new Constant(intZero));
2144 Value nm = append(new IfOp(val, Instruction::neq, object_null, int_one, int_zero, state_before, false));
2145 Value nm_offset = append(new Constant(new LongConstant(offset + inline_klass->null_marker_offset_in_payload())));
2146 append(new UnsafePut(T_BOOLEAN, obj, nm_offset, nm, false));
2147 }
2148 }
2149 break;
2150 }
2151 default:
2152 ShouldNotReachHere();
2153 break;
2154 }
2155 }
2156
2157 Dependencies* GraphBuilder::dependency_recorder() const {
2158 return compilation()->dependency_recorder();
2159 }
2160
2161 // How many arguments do we want to profile?
2162 Values* GraphBuilder::args_list_for_profiling(ciMethod* target, int& start, bool may_have_receiver) {
2163 int n = 0;
2164 bool has_receiver = may_have_receiver && Bytecodes::has_receiver(method()->java_code_at_bci(bci()));
2165 start = has_receiver ? 1 : 0;
2166 if (profile_arguments()) {
2167 ciProfileData* data = method()->method_data()->bci_to_data(bci());
2168 if (data != nullptr && (data->is_CallTypeData() || data->is_VirtualCallTypeData())) {
2169 n = data->is_CallTypeData() ? data->as_CallTypeData()->number_of_arguments() : data->as_VirtualCallTypeData()->number_of_arguments();
2170 }
2171 }
2172 // If we are inlining then we need to collect arguments to profile parameters for the target
2173 if (profile_parameters() && target != nullptr) {
2174 if (target->method_data() != nullptr && target->method_data()->parameters_type_data() != nullptr) {
2175 // The receiver is profiled on method entry so it's included in
2176 // the number of parameters but here we're only interested in
2252 break;
2253 case Bytecodes::_invokehandle:
2254 code = target->is_static() ? Bytecodes::_invokestatic : Bytecodes::_invokespecial;
2255 break;
2256 default:
2257 break;
2258 }
2259 } else {
2260 if (bc_raw == Bytecodes::_invokehandle) {
2261 assert(!will_link, "should come here only for unlinked call");
2262 code = Bytecodes::_invokespecial;
2263 }
2264 }
2265
2266 if (code == Bytecodes::_invokespecial) {
2267 // Additional receiver subtype checks for interface calls via invokespecial or invokeinterface.
2268 ciKlass* receiver_constraint = nullptr;
2269
2270 if (bc_raw == Bytecodes::_invokeinterface) {
2271 receiver_constraint = holder;
2272 } else if (bc_raw == Bytecodes::_invokespecial && !target->is_object_constructor() && calling_klass->is_interface()) {
2273 receiver_constraint = calling_klass;
2274 }
2275
2276 if (receiver_constraint != nullptr) {
2277 int index = state()->stack_size() - (target->arg_size_no_receiver() + 1);
2278 Value receiver = state()->stack_at(index);
2279 CheckCast* c = new CheckCast(receiver_constraint, receiver, copy_state_before());
2280 // go to uncommon_trap when checkcast fails
2281 c->set_invokespecial_receiver_check();
2282 state()->stack_at_put(index, append_split(c));
2283 }
2284 }
2285
2286 // Push appendix argument (MethodType, CallSite, etc.), if one.
2287 bool patch_for_appendix = false;
2288 int patching_appendix_arg = 0;
2289 if (Bytecodes::has_optional_appendix(bc_raw) && (!will_link || PatchALot)) {
2290 Value arg = append(new Constant(new ObjectConstant(compilation()->env()->unloaded_ciinstance()), copy_state_before()));
2291 apush(arg);
2292 patch_for_appendix = true;
2442 }
2443 } else {
2444 print_inlining(target, "no static binding", /*success*/ false);
2445 }
2446 } else {
2447 print_inlining(target, "not inlineable", /*success*/ false);
2448 }
2449
2450 // If we attempted an inline which did not succeed because of a
2451 // bailout during construction of the callee graph, the entire
2452 // compilation has to be aborted. This is fairly rare and currently
2453 // seems to only occur for jasm-generated classes which contain
2454 // jsr/ret pairs which are not associated with finally clauses and
2455 // do not have exception handlers in the containing method, and are
2456 // therefore not caught early enough to abort the inlining without
2457 // corrupting the graph. (We currently bail out with a non-empty
2458 // stack at a ret in these situations.)
2459 CHECK_BAILOUT();
2460
2461 // inlining not successful => standard invoke
2462 ciType* return_type = declared_signature->return_type();
2463 ValueStack* state_before = copy_state_exhandling();
2464
2465 // The bytecode (code) might change in this method so we are checking this very late.
2466 const bool has_receiver =
2467 code == Bytecodes::_invokespecial ||
2468 code == Bytecodes::_invokevirtual ||
2469 code == Bytecodes::_invokeinterface;
2470 Values* args = state()->pop_arguments(target->arg_size_no_receiver() + patching_appendix_arg);
2471 Value recv = has_receiver ? apop() : nullptr;
2472
2473 // A null check is required here (when there is a receiver) for any of the following cases
2474 // - invokespecial, always need a null check.
2475 // - invokevirtual, when the target is final and loaded. Calls to final targets will become optimized
2476 // and require null checking. If the target is loaded a null check is emitted here.
2477 // If the target isn't loaded the null check must happen after the call resolution. We achieve that
2478 // by using the target methods unverified entry point (see CompiledIC::compute_monomorphic_entry).
2479 // (The JVM specification requires that LinkageError must be thrown before a NPE. An unloaded target may
2480 // potentially fail, and can't have the null check before the resolution.)
2481 // - A call that will be profiled. (But we can't add a null check when the target is unloaded, by the same
2482 // reason as above, so calls with a receiver to unloaded targets can't be profiled.)
2491 null_check(recv);
2492 }
2493
2494 if (is_profiling()) {
2495 // Note that we'd collect profile data in this method if we wanted it.
2496 compilation()->set_would_profile(true);
2497
2498 if (profile_calls()) {
2499 assert(cha_monomorphic_target == nullptr || exact_target == nullptr, "both can not be set");
2500 ciKlass* target_klass = nullptr;
2501 if (cha_monomorphic_target != nullptr) {
2502 target_klass = cha_monomorphic_target->holder();
2503 } else if (exact_target != nullptr) {
2504 target_klass = exact_target->holder();
2505 }
2506 profile_call(target, recv, target_klass, collect_args_for_profiling(args, nullptr, false), false);
2507 }
2508 }
2509 }
2510
2511 Invoke* result = new Invoke(code, return_type, recv, args, target, state_before);
2512 // push result
2513 append_split(result);
2514
2515 if (!return_type->is_void()) {
2516 push(as_ValueType(return_type), result);
2517 }
2518
2519 if (profile_return() && return_type->is_object()) {
2520 profile_return_type(result, target);
2521 }
2522 }
2523
2524
2525 void GraphBuilder::new_instance(int klass_index) {
2526 ValueStack* state_before = copy_state_exhandling();
2527 ciKlass* klass = stream()->get_klass();
2528 assert(klass->is_instance_klass(), "must be an instance klass");
2529 NewInstance* new_instance = new NewInstance(klass->as_instance_klass(), state_before, stream()->is_unresolved_klass(), false);
2530 _memory->new_instance(new_instance);
2531 apush(append_split(new_instance));
2532 }
2533
2534 void GraphBuilder::new_type_array() {
2535 ValueStack* state_before = copy_state_exhandling();
2536 apush(append_split(new NewTypeArray(ipop(), (BasicType)stream()->get_index(), state_before, true)));
2537 }
2538
2539
2540 void GraphBuilder::new_object_array() {
2541 ciKlass* klass = stream()->get_klass();
2542 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
2543 NewArray* n = new NewObjectArray(klass, ipop(), state_before);
2544 apush(append_split(n));
2545 }
2546
2547
2548 bool GraphBuilder::direct_compare(ciKlass* k) {
2549 if (k->is_loaded() && k->is_instance_klass() && !UseSlowPath) {
2550 ciInstanceKlass* ik = k->as_instance_klass();
2551 if (ik->is_final()) {
2552 return true;
2553 } else {
2586 ciKlass* klass = stream()->get_klass();
2587 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
2588 InstanceOf* i = new InstanceOf(klass, apop(), state_before);
2589 ipush(append_split(i));
2590 i->set_direct_compare(direct_compare(klass));
2591
2592 if (is_profiling()) {
2593 // Note that we'd collect profile data in this method if we wanted it.
2594 compilation()->set_would_profile(true);
2595
2596 if (profile_checkcasts()) {
2597 i->set_profiled_method(method());
2598 i->set_profiled_bci(bci());
2599 i->set_should_profile(true);
2600 }
2601 }
2602 }
2603
2604
2605 void GraphBuilder::monitorenter(Value x, int bci) {
2606 bool maybe_inlinetype = false;
2607 if (bci == InvocationEntryBci) {
2608 // Called by GraphBuilder::inline_sync_entry.
2609 #ifdef ASSERT
2610 ciType* obj_type = x->declared_type();
2611 assert(obj_type == nullptr || !obj_type->is_inlinetype(), "inline types cannot have synchronized methods");
2612 #endif
2613 } else {
2614 // We are compiling a monitorenter bytecode
2615 if (Arguments::is_valhalla_enabled()) {
2616 ciType* obj_type = x->declared_type();
2617 if (obj_type == nullptr || obj_type->can_be_inline_klass()) {
2618 // If we're (possibly) locking on an inline type, check for markWord::always_locked_pattern
2619 // and throw IMSE. (obj_type is null for Phi nodes, so let's just be conservative).
2620 maybe_inlinetype = true;
2621 }
2622 }
2623 }
2624
2625 // save state before locking in case of deoptimization after a NullPointerException
2626 ValueStack* state_before = copy_state_for_exception_with_bci(bci);
2627 append_with_bci(new MonitorEnter(x, state()->lock(x), state_before, maybe_inlinetype), bci);
2628 kill_all();
2629 }
2630
2631
2632 void GraphBuilder::monitorexit(Value x, int bci) {
2633 append_with_bci(new MonitorExit(x, state()->unlock()), bci);
2634 kill_all();
2635 }
2636
2637
2638 void GraphBuilder::new_multi_array(int dimensions) {
2639 ciKlass* klass = stream()->get_klass();
2640 ValueStack* state_before = !klass->is_loaded() || PatchALot ? copy_state_before() : copy_state_exhandling();
2641
2642 Values* dims = new Values(dimensions, dimensions, nullptr);
2643 // fill in all dimensions
2644 int i = dimensions;
2645 while (i-- > 0) dims->at_put(i, ipop());
2646 // create array
2647 NewArray* n = new NewMultiArray(klass, dims, state_before);
2732
2733 Instruction* GraphBuilder::append_split(StateSplit* instr) {
2734 return append_with_bci(instr, bci());
2735 }
2736
2737
2738 void GraphBuilder::null_check(Value value) {
2739 if (value->as_NewArray() != nullptr || value->as_NewInstance() != nullptr) {
2740 return;
2741 } else {
2742 Constant* con = value->as_Constant();
2743 if (con) {
2744 ObjectType* c = con->type()->as_ObjectType();
2745 if (c && c->is_loaded()) {
2746 ObjectConstant* oc = c->as_ObjectConstant();
2747 if (!oc || !oc->value()->is_null_object()) {
2748 return;
2749 }
2750 }
2751 }
2752 if (value->is_null_free()) return;
2753 }
2754 append(new NullCheck(value, copy_state_for_exception()));
2755 }
2756
2757
2758
2759 XHandlers* GraphBuilder::handle_exception(Instruction* instruction) {
2760 if (!has_handler() && (!instruction->needs_exception_state() || instruction->exception_state() != nullptr)) {
2761 assert(instruction->exception_state() == nullptr
2762 || instruction->exception_state()->kind() == ValueStack::EmptyExceptionState
2763 || (instruction->exception_state()->kind() == ValueStack::ExceptionState && _compilation->env()->should_retain_local_variables()),
2764 "exception_state should be of exception kind");
2765 return new XHandlers();
2766 }
2767
2768 XHandlers* exception_handlers = new XHandlers();
2769 ScopeData* cur_scope_data = scope_data();
2770 ValueStack* cur_state = instruction->state_before();
2771 ValueStack* prev_state = nullptr;
2772 int scope_count = 0;
2773
2774 assert(cur_state != nullptr, "state_before must be set");
2775 do {
2776 int cur_bci = cur_state->bci();
2777 assert(cur_scope_data->scope() == cur_state->scope(), "scopes do not match");
2778 assert(cur_bci == SynchronizationEntryBCI || cur_bci == cur_scope_data->stream()->cur_bci()
2779 || has_pending_field_access() || has_pending_load_indexed(), "invalid bci");
2780
2781
2782 // join with all potential exception handlers
2783 XHandlers* list = cur_scope_data->xhandlers();
2784 const int n = list->length();
2785 for (int i = 0; i < n; i++) {
2786 XHandler* h = list->handler_at(i);
2787 if (h->covers(cur_bci)) {
2788 // h is a potential exception handler => join it
2789 compilation()->set_has_exception_handlers(true);
2790
2791 BlockBegin* entry = h->entry_block();
2792 if (entry == block()) {
2793 // It's acceptable for an exception handler to cover itself
2794 // but we don't handle that in the parser currently. It's
2795 // very rare so we bailout instead of trying to handle it.
2796 BAILOUT_("exception handler covers itself", exception_handlers);
2797 }
2798 assert(entry->bci() == h->handler_bci(), "must match");
2799 assert(entry->bci() == -1 || entry == cur_scope_data->block_at(entry->bci()), "blocks must correspond");
2800
3574 state->store_local(idx, new Local(type, vt, idx, false));
3575 idx += type->size();
3576 }
3577
3578 // lock synchronized method
3579 if (method()->is_synchronized()) {
3580 state->lock(nullptr);
3581 }
3582
3583 return state;
3584 }
3585
3586
3587 GraphBuilder::GraphBuilder(Compilation* compilation, IRScope* scope)
3588 : _scope_data(nullptr)
3589 , _compilation(compilation)
3590 , _memory(new MemoryBuffer())
3591 , _inline_bailout_msg(nullptr)
3592 , _instruction_count(0)
3593 , _osr_entry(nullptr)
3594 , _pending_field_access(nullptr)
3595 , _pending_load_indexed(nullptr)
3596 {
3597 int osr_bci = compilation->osr_bci();
3598
3599 // determine entry points and bci2block mapping
3600 BlockListBuilder blm(compilation, scope, osr_bci);
3601 CHECK_BAILOUT();
3602
3603 BlockList* bci2block = blm.bci2block();
3604 BlockBegin* start_block = bci2block->at(0);
3605
3606 push_root_scope(scope, bci2block, start_block);
3607
3608 // setup state for std entry
3609 _initial_state = state_at_entry();
3610 start_block->merge(_initial_state, compilation->has_irreducible_loops());
3611
3612 // End nulls still exist here
3613
3614 // complete graph
3615 _vmap = new ValueMap();
4328 // Temporarily set up bytecode stream so we can append instructions
4329 // (only using the bci of this stream)
4330 scope_data()->set_stream(scope_data()->parent()->stream());
4331
4332 // Pass parameters into callee state: add assignments
4333 // note: this will also ensure that all arguments are computed before being passed
4334 ValueStack* callee_state = state();
4335 ValueStack* caller_state = state()->caller_state();
4336 for (int i = args_base; i < caller_state->stack_size(); ) {
4337 const int arg_no = i - args_base;
4338 Value arg = caller_state->stack_at_inc(i);
4339 store_local(callee_state, arg, arg_no);
4340 }
4341
4342 // Remove args from stack.
4343 // Note that we preserve locals state in case we can use it later
4344 // (see use of pop_scope() below)
4345 caller_state->truncate_stack(args_base);
4346 assert(callee_state->stack_size() == 0, "callee stack must be empty");
4347
4348 // Check if we need a membar at the beginning of the java.lang.Object
4349 // constructor to satisfy the memory model for strict fields.
4350 if (Arguments::is_valhalla_enabled() && method()->intrinsic_id() == vmIntrinsics::_Object_init) {
4351 Value receiver = state()->local_at(0);
4352 ciType* klass = receiver->exact_type();
4353 if (klass == nullptr) {
4354 // No exact type, check if the declared type has no implementors and add a dependency
4355 klass = receiver->declared_type();
4356 klass = compilation()->cha_exact_type(klass);
4357 }
4358 if (klass != nullptr && klass->is_instance_klass()) {
4359 // Exact receiver type, check if there is a strict field
4360 ciInstanceKlass* holder = klass->as_instance_klass();
4361 for (int i = 0; i < holder->nof_nonstatic_fields(); i++) {
4362 ciField* field = holder->nonstatic_field_at(i);
4363 if (field->is_strict()) {
4364 // Found a strict field, a membar is needed
4365 append(new MemBar(lir_membar_storestore));
4366 break;
4367 }
4368 }
4369 } else if (klass == nullptr) {
4370 // We can't statically determine the type of the receiver and therefore need
4371 // to put a membar here because it could have a strict field.
4372 append(new MemBar(lir_membar_storestore));
4373 }
4374 }
4375
4376 Value lock = nullptr;
4377 BlockBegin* sync_handler = nullptr;
4378
4379 // Inline the locking of the receiver if the callee is synchronized
4380 if (callee->is_synchronized()) {
4381 lock = callee->is_static() ? append(new Constant(new InstanceConstant(callee->holder()->java_mirror())))
4382 : state()->local_at(0);
4383 sync_handler = new BlockBegin(SynchronizationEntryBCI);
4384 inline_sync_entry(lock, sync_handler);
4385 }
4386
4387 if (compilation()->env()->dtrace_method_probes()) {
4388 Values* args = new Values(1);
4389 args->push(append(new Constant(new MethodConstant(method()))));
4390 append(new RuntimeCall(voidType, "dtrace_method_entry", CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry), args));
4391 }
4392
4393 if (profile_inlined_calls()) {
4394 profile_invocation(callee, copy_state_before_with_bci(SynchronizationEntryBCI));
4395 }
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