1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #include "art_method-inl.h" 18 #include "check_reference_map_visitor.h" 19 #include "jni.h" 20 21 namespace art { 22 23 #define CHECK_REGS_CONTAIN_REFS(dex_pc, abort_if_not_found, ...) do { \ 24 int t[] = {__VA_ARGS__}; \ 25 int t_size = sizeof(t) / sizeof(*t); \ 26 const OatQuickMethodHeader* method_header = GetCurrentOatQuickMethodHeader(); \ 27 uintptr_t native_quick_pc = method_header->ToNativeQuickPc(GetMethod(), \ 28 dex_pc, \ 29 /* is_catch_handler */ false, \ 30 abort_if_not_found); \ 31 if (native_quick_pc != UINTPTR_MAX) { \ 32 CheckReferences(t, t_size, method_header->NativeQuickPcOffset(native_quick_pc)); \ 33 } \ 34 } while (false); 35 36 struct ReferenceMap2Visitor : public CheckReferenceMapVisitor { 37 explicit ReferenceMap2Visitor(Thread* thread) REQUIRES_SHARED(Locks::mutator_lock_) 38 : CheckReferenceMapVisitor(thread) {} 39 40 bool VisitFrame() REQUIRES_SHARED(Locks::mutator_lock_) { 41 if (CheckReferenceMapVisitor::VisitFrame()) { 42 return true; 43 } 44 ArtMethod* m = GetMethod(); 45 std::string m_name(m->GetName()); 46 47 // Given the method name and the number of times the method has been called, 48 // we know the Dex registers with live reference values. Assert that what we 49 // find is what is expected. 50 if (m_name.compare("f") == 0) { 51 CHECK_REGS_CONTAIN_REFS(0x03U, true, 8); // v8: this 52 CHECK_REGS_CONTAIN_REFS(0x06U, true, 8, 1); // v8: this, v1: x 53 CHECK_REGS_CONTAIN_REFS(0x0cU, true, 8, 3, 1); // v8: this, v3: y, v1: x 54 CHECK_REGS_CONTAIN_REFS(0x10U, true, 8, 3, 1); // v8: this, v3: y, v1: x 55 // v2 is added because of the instruction at DexPC 0024. Object merges with 0 is Object. See: 56 // 0024: move-object v3, v2 57 // 0025: goto 0013 58 // Detailed dex instructions for ReferenceMap.java are at the end of this function. 59 // CHECK_REGS_CONTAIN_REFS(8, 3, 2, 1); // v8: this, v3: y, v2: y, v1: x 60 // We eliminate the non-live registers at a return, so only v3 is live. 61 // Note that it is OK for a compiler to not have a dex map at this dex PC because 62 // a return is not necessarily a safepoint. 63 CHECK_REGS_CONTAIN_REFS(0x13U, false, 3); // v3: y 64 // Note that v0: ex can be eliminated because it's a dead merge of two different exceptions. 65 CHECK_REGS_CONTAIN_REFS(0x18U, true, 8, 2, 1); // v8: this, v2: y, v1: x (dead v0: ex) 66 CHECK_REGS_CONTAIN_REFS(0x21U, true, 8, 2, 1); // v8: this, v2: y, v1: x (dead v0: ex) 67 68 if (!GetCurrentOatQuickMethodHeader()->IsOptimized()) { 69 CHECK_REGS_CONTAIN_REFS(0x27U, true, 8, 4, 2, 1); // v8: this, v4: ex, v2: y, v1: x 70 } 71 CHECK_REGS_CONTAIN_REFS(0x29U, true, 8, 4, 2, 1); // v8: this, v4: ex, v2: y, v1: x 72 CHECK_REGS_CONTAIN_REFS(0x2cU, true, 8, 4, 2, 1); // v8: this, v4: ex, v2: y, v1: x 73 // Note that it is OK for a compiler to not have a dex map at these two dex PCs because 74 // a goto is not necessarily a safepoint. 75 CHECK_REGS_CONTAIN_REFS(0x2fU, false, 8, 4, 3, 2, 1); // v8: this, v4: ex, v3: y, v2: y, v1: x 76 CHECK_REGS_CONTAIN_REFS(0x32U, false, 8, 3, 2, 1, 0); // v8: this, v3: y, v2: y, v1: x, v0: ex 77 } 78 79 return true; 80 } 81 }; 82 83 // Dex instructions for the function 'f' in ReferenceMap.java 84 // Virtual methods - 85 // #0 : (in LReferenceMap;) 86 // name : 'f' 87 // type : '()Ljava/lang/Object;' 88 // access : 0x0000 () 89 // code - 90 // registers : 9 91 // ins : 1 92 // outs : 2 93 // insns size : 51 16-bit code units 94 // |[0001e8] ReferenceMap.f:()Ljava/lang/Object; 95 // |0000: const/4 v4, #int 2 // #2 96 // |0001: const/4 v7, #int 0 // #0 97 // |0002: const/4 v6, #int 1 // #1 98 // 99 // 0:[Unknown],1:[Unknown],2:[Unknown],3:[Unknown],4:[32-bit Constant: 2],5:[Unknown],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap], 100 // |0003: new-array v1, v4, [Ljava/lang/Object; // type@0007 101 // |0005: const/4 v2, #int 0 // #0 102 103 // 0:[Unknown],1:[Reference: java.lang.Object[]],2:[Zero],3:[Unknown],4:[32-bit Constant: 2],5:[Unknown],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap], 104 // |0006: new-instance v3, Ljava/lang/Object; // type@0003 105 106 // [Unknown],1:[Reference: java.lang.Object[]],2:[Zero],3:[Uninitialized Reference: java.lang.Object],4:[32-bit Constant: 2],5:[Unknown],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap], 107 // |0008: +invoke-object-init/range {}, Ljava/lang/Object;.<init>:()V // method@0005 108 // |000b: const/4 v4, #int 2 // #2 109 110 // 0:[Unknown],1:[Reference: java.lang.Object[]],2:[Zero],3:[Reference: java.lang.Object],4:[32-bit Constant: 2],5:[Unknown],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap], 111 // |000c: aput-object v3, v1, v4 112 113 // 0:[Unknown],1:[Reference: java.lang.Object[]],2:[Zero],3:[Reference: java.lang.Object],4:[32-bit Constant: 2],5:[Unknown],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap], 114 // |000e: aput-object v3, v1, v6 115 116 // 0:[Unknown],1:[Reference: java.lang.Object[]],2:[Zero],3:[Reference: java.lang.Object],4:[32-bit Constant: 2],5:[Unknown],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap], 117 // |0010: +invoke-virtual-quick {v8, v7}, [000c] // vtable #000c 118 119 // 0:[Conflict],1:[Conflict],2:[Conflict],3:[Reference: java.lang.Object],4:[Conflict],5:[Conflict],6:[Conflict],7:[Conflict],8:[Conflict], 120 // |0013: return-object v3 121 // |0014: move-exception v0 122 123 // 0:[Reference: java.lang.Exception],1:[Reference: java.lang.Object[]],2:[Reference: java.lang.Object],3:[Conflict],4:[32-bit Constant: 2],5:[Unknown],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap], 124 // |0015: if-nez v2, 001f // +000a 125 // |0017: const/4 v4, #int 1 // #1 126 127 // 0:[Reference: java.lang.Exception],1:[Reference: java.lang.Object[]],2:[Reference: java.lang.Object],3:[Conflict],4:[32-bit Constant: 1],5:[Unknown],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap], 128 // |0018: new-instance v5, Ljava/lang/Object; // type@0003 129 130 // 0:[Reference: java.lang.Exception],1:[Reference: java.lang.Object[]],2:[Reference: java.lang.Object],3:[Conflict],4:[32-bit Constant: 1],5:[Uninitialized Reference: java.lang.Object],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap], 131 // |001a: +invoke-object-init/range {}, Ljava/lang/Object;.<init>:()V // method@0005 132 133 // 0:[Reference: java.lang.Exception],1:[Reference: java.lang.Object[]],2:[Reference: java.lang.Object],3:[Conflict],4:[32-bit Constant: 1],5:[Reference: java.lang.Object],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap], 134 // |001d: aput-object v5, v1, v4 135 136 // 0:[Reference: java.lang.Exception],1:[Reference: java.lang.Object[]],2:[Reference: java.lang.Object],3:[Conflict],4:[32-bit Constant: 2],5:[Conflict],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap], 137 // |001f: aput-object v2, v1, v6 138 139 // 0:[Reference: java.lang.Exception],1:[Reference: java.lang.Object[]],2:[Reference: java.lang.Object],3:[Conflict],4:[32-bit Constant: 2],5:[Conflict],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap], 140 // |0021: +invoke-virtual-quick {v8, v7}, [000c] // vtable #000c 141 // |0024: move-object v3, v2 142 143 // 0:[Reference: java.lang.Exception],1:[Reference: java.lang.Object[]],2:[Reference: java.lang.Object],3:[Reference: java.lang.Object],4:[32-bit Constant: 2],5:[Conflict],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap], 144 // |0025: goto 0013 // -0012 145 // |0026: move-exception v4 146 147 // 0:[Conflict],1:[Reference: java.lang.Object[]],2:[Reference: java.lang.Object],3:[Conflict],4:[Reference: java.lang.Throwable],5:[Conflict],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap], 148 // |0027: aput-object v2, v1, v6 149 150 // 0:[Conflict],1:[Reference: java.lang.Object[]],2:[Reference: java.lang.Object],3:[Conflict],4:[Reference: java.lang.Throwable],5:[Conflict],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap], 151 // |0029: +invoke-virtual-quick {v8, v7}, [000c] // vtable #000c 152 153 // 0:[Conflict],1:[Reference: java.lang.Object[]],2:[Reference: java.lang.Object],3:[Conflict],4:[Reference: java.lang.Throwable],5:[Conflict],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap], 154 // |002c: throw v4 155 // |002d: move-exception v4 156 // |002e: move-object v2, v3 157 158 // 0:[Unknown],1:[Reference: java.lang.Object[]],2:[Reference: java.lang.Object],3:[Reference: java.lang.Object],4:[Reference: java.lang.Throwable],5:[Unknown],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap], 159 // |002f: goto 0027 // -0008 160 // |0030: move-exception v0 161 // |0031: move-object v2, v3 162 163 // 0:[Reference: java.lang.Exception],1:[Reference: java.lang.Object[]],2:[Reference: java.lang.Object],3:[Reference: java.lang.Object],4:[32-bit Constant: 2],5:[Unknown],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap], 164 // |0032: goto 0015 // -001d 165 // catches : 3 166 // 0x0006 - 0x000b 167 // Ljava/lang/Exception; -> 0x0014 168 // <any> -> 0x0026 169 // 0x000c - 0x000e 170 // Ljava/lang/Exception; -> 0x0030 171 // <any> -> 0x002d 172 // 0x0018 - 0x001f 173 // <any> -> 0x0026 174 // positions : 175 // 0x0003 line=8 176 // 0x0005 line=9 177 // 0x0006 line=11 178 // 0x000b line=12 179 // 0x000e line=18 180 // 0x0010 line=19 181 // 0x0013 line=21 182 // 0x0014 line=13 183 // 0x0015 line=14 184 // 0x0017 line=15 185 // 0x001f line=18 186 // 0x0021 line=19 187 // 0x0025 line=20 188 // 0x0026 line=18 189 // 0x0029 line=19 190 // 0x002d line=18 191 // 0x0030 line=13 192 // locals : 193 // 0x0006 - 0x000b reg=2 y Ljava/lang/Object; 194 // 0x000b - 0x0013 reg=3 y Ljava/lang/Object; 195 // 0x0014 - 0x0015 reg=2 y Ljava/lang/Object; 196 // 0x0015 - 0x0026 reg=0 ex Ljava/lang/Exception; 197 // 0x002d - 0x0032 reg=3 y Ljava/lang/Object; 198 // 0x0005 - 0x0033 reg=1 x [Ljava/lang/Object; 199 // 0x0032 - 0x0033 reg=2 y Ljava/lang/Object; 200 // 0x0000 - 0x0033 reg=8 this LReferenceMap; 201 202 extern "C" JNIEXPORT jint JNICALL Java_Main_refmap(JNIEnv*, jobject, jint count) { 203 // Visitor 204 ScopedObjectAccess soa(Thread::Current()); 205 ReferenceMap2Visitor mapper(soa.Self()); 206 mapper.WalkStack(); 207 208 return count + 1; 209 } 210 211 } // namespace art 212
