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 <stdio.h> 18 #include <memory> 19 20 #include "class_linker.h" 21 #include "dex_file-inl.h" 22 #include "gc_map.h" 23 #include "mirror/art_method-inl.h" 24 #include "mirror/class-inl.h" 25 #include "mirror/object_array-inl.h" 26 #include "mirror/object-inl.h" 27 #include "scoped_thread_state_change.h" 28 #include "thread.h" 29 #include "jni.h" 30 #include "verifier/method_verifier.h" 31 32 namespace art { 33 34 #define IS_IN_REF_BITMAP(ref_bitmap, reg) \ 35 (((reg) < m->GetCodeItem()->registers_size_) && \ 36 ((*((ref_bitmap) + (reg)/8) >> ((reg) % 8) ) & 0x01)) 37 38 #define CHECK_REGS_CONTAIN_REFS(...) \ 39 do { \ 40 int t[] = {__VA_ARGS__}; \ 41 int t_size = sizeof(t) / sizeof(*t); \ 42 for (int i = 0; i < t_size; ++i) \ 43 CHECK(IS_IN_REF_BITMAP(ref_bitmap, t[i])) \ 44 << "Error: Reg @ " << i << "-th argument is not in GC map"; \ 45 } while (false) 46 47 struct ReferenceMap2Visitor : public StackVisitor { 48 explicit ReferenceMap2Visitor(Thread* thread) 49 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) 50 : StackVisitor(thread, NULL) { 51 } 52 53 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { 54 mirror::ArtMethod* m = GetMethod(); 55 if (!m || m->IsNative() || m->IsRuntimeMethod() || IsShadowFrame()) { 56 return true; 57 } 58 LOG(INFO) << "At " << PrettyMethod(m, false); 59 60 NativePcOffsetToReferenceMap map(m->GetNativeGcMap(sizeof(void*))); 61 62 if (m->IsCalleeSaveMethod()) { 63 LOG(WARNING) << "no PC for " << PrettyMethod(m); 64 return true; 65 } 66 67 const uint8_t* ref_bitmap = NULL; 68 std::string m_name(m->GetName()); 69 70 // Given the method name and the number of times the method has been called, 71 // we know the Dex registers with live reference values. Assert that what we 72 // find is what is expected. 73 if (m_name.compare("f") == 0) { 74 ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToNativePc(0x03U))); 75 CHECK(ref_bitmap); 76 CHECK_REGS_CONTAIN_REFS(8); // v8: this 77 78 ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToNativePc(0x06U))); 79 CHECK(ref_bitmap); 80 CHECK_REGS_CONTAIN_REFS(8, 1); // v8: this, v1: x 81 82 ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToNativePc(0x08U))); 83 CHECK(ref_bitmap); 84 CHECK_REGS_CONTAIN_REFS(8, 3, 1); // v8: this, v3: y, v1: x 85 86 ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToNativePc(0x0cU))); 87 CHECK(ref_bitmap); 88 CHECK_REGS_CONTAIN_REFS(8, 3, 1); // v8: this, v3: y, v1: x 89 90 ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToNativePc(0x0eU))); 91 CHECK(ref_bitmap); 92 CHECK_REGS_CONTAIN_REFS(8, 3, 1); // v8: this, v3: y, v1: x 93 94 ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToNativePc(0x10U))); 95 CHECK(ref_bitmap); 96 CHECK_REGS_CONTAIN_REFS(8, 3, 1); // v8: this, v3: y, v1: x 97 98 ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToNativePc(0x13U))); 99 CHECK(ref_bitmap); 100 // v2 is added because of the instruction at DexPC 0024. Object merges with 0 is Object. See: 101 // 0024: move-object v3, v2 102 // 0025: goto 0013 103 // Detaled dex instructions for ReferenceMap.java are at the end of this function. 104 // CHECK_REGS_CONTAIN_REFS(8, 3, 2, 1); // v8: this, v3: y, v2: y, v1: x 105 // We eliminate the non-live registers at a return, so only v3 is live: 106 CHECK_REGS_CONTAIN_REFS(3); // v3: y 107 108 ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToNativePc(0x18U))); 109 CHECK(ref_bitmap); 110 CHECK_REGS_CONTAIN_REFS(8, 2, 1, 0); // v8: this, v2: y, v1: x, v0: ex 111 112 ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToNativePc(0x1aU))); 113 CHECK(ref_bitmap); 114 CHECK_REGS_CONTAIN_REFS(8, 5, 2, 1, 0); // v8: this, v5: x[1], v2: y, v1: x, v0: ex 115 116 ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToNativePc(0x1dU))); 117 CHECK(ref_bitmap); 118 CHECK_REGS_CONTAIN_REFS(8, 5, 2, 1, 0); // v8: this, v5: x[1], v2: y, v1: x, v0: ex 119 120 ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToNativePc(0x1fU))); 121 CHECK(ref_bitmap); 122 // v5 is removed from the root set because there is a "merge" operation. 123 // See 0015: if-nez v2, 001f. 124 CHECK_REGS_CONTAIN_REFS(8, 2, 1, 0); // v8: this, v2: y, v1: x, v0: ex 125 126 ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToNativePc(0x21U))); 127 CHECK(ref_bitmap); 128 CHECK_REGS_CONTAIN_REFS(8, 2, 1, 0); // v8: this, v2: y, v1: x, v0: ex 129 130 ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToNativePc(0x27U))); 131 CHECK(ref_bitmap); 132 CHECK_REGS_CONTAIN_REFS(8, 4, 2, 1); // v8: this, v4: ex, v2: y, v1: x 133 134 ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToNativePc(0x29U))); 135 CHECK(ref_bitmap); 136 CHECK_REGS_CONTAIN_REFS(8, 4, 2, 1); // v8: this, v4: ex, v2: y, v1: x 137 138 ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToNativePc(0x2cU))); 139 CHECK(ref_bitmap); 140 CHECK_REGS_CONTAIN_REFS(8, 4, 2, 1); // v8: this, v4: ex, v2: y, v1: x 141 142 ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToNativePc(0x2fU))); 143 CHECK(ref_bitmap); 144 CHECK_REGS_CONTAIN_REFS(8, 4, 3, 2, 1); // v8: this, v4: ex, v3: y, v2: y, v1: x 145 146 ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToNativePc(0x32U))); 147 CHECK(ref_bitmap); 148 CHECK_REGS_CONTAIN_REFS(8, 3, 2, 1, 0); // v8: this, v3: y, v2: y, v1: x, v0: ex 149 } 150 151 return true; 152 } 153 }; 154 155 // Dex instructions for the function 'f' in ReferenceMap.java 156 // Virtual methods - 157 // #0 : (in LReferenceMap;) 158 // name : 'f' 159 // type : '()Ljava/lang/Object;' 160 // access : 0x0000 () 161 // code - 162 // registers : 9 163 // ins : 1 164 // outs : 2 165 // insns size : 51 16-bit code units 166 // |[0001e8] ReferenceMap.f:()Ljava/lang/Object; 167 // |0000: const/4 v4, #int 2 // #2 168 // |0001: const/4 v7, #int 0 // #0 169 // |0002: const/4 v6, #int 1 // #1 170 // 171 // 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], 172 // |0003: new-array v1, v4, [Ljava/lang/Object; // type@0007 173 // |0005: const/4 v2, #int 0 // #0 174 175 // 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], 176 // |0006: new-instance v3, Ljava/lang/Object; // type@0003 177 178 // [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], 179 // |0008: +invoke-object-init/range {}, Ljava/lang/Object;.<init>:()V // method@0005 180 // |000b: const/4 v4, #int 2 // #2 181 182 // 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], 183 // |000c: aput-object v3, v1, v4 184 185 // 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], 186 // |000e: aput-object v3, v1, v6 187 188 // 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], 189 // |0010: +invoke-virtual-quick {v8, v7}, [000c] // vtable #000c 190 191 // 0:[Conflict],1:[Conflict],2:[Conflict],3:[Reference: java.lang.Object],4:[Conflict],5:[Conflict],6:[Conflict],7:[Conflict],8:[Conflict], 192 // |0013: return-object v3 193 // |0014: move-exception v0 194 195 // 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], 196 // |0015: if-nez v2, 001f // +000a 197 // |0017: const/4 v4, #int 1 // #1 198 199 // 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], 200 // |0018: new-instance v5, Ljava/lang/Object; // type@0003 201 202 // 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], 203 // |001a: +invoke-object-init/range {}, Ljava/lang/Object;.<init>:()V // method@0005 204 205 // 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], 206 // |001d: aput-object v5, v1, v4 207 208 // 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], 209 // |001f: aput-object v2, v1, v6 210 211 // 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], 212 // |0021: +invoke-virtual-quick {v8, v7}, [000c] // vtable #000c 213 // |0024: move-object v3, v2 214 215 // 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], 216 // |0025: goto 0013 // -0012 217 // |0026: move-exception v4 218 219 // 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], 220 // |0027: aput-object v2, v1, v6 221 222 // 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], 223 // |0029: +invoke-virtual-quick {v8, v7}, [000c] // vtable #000c 224 225 // 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], 226 // |002c: throw v4 227 // |002d: move-exception v4 228 // |002e: move-object v2, v3 229 230 // 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], 231 // |002f: goto 0027 // -0008 232 // |0030: move-exception v0 233 // |0031: move-object v2, v3 234 235 // 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], 236 // |0032: goto 0015 // -001d 237 // catches : 3 238 // 0x0006 - 0x000b 239 // Ljava/lang/Exception; -> 0x0014 240 // <any> -> 0x0026 241 // 0x000c - 0x000e 242 // Ljava/lang/Exception; -> 0x0030 243 // <any> -> 0x002d 244 // 0x0018 - 0x001f 245 // <any> -> 0x0026 246 // positions : 247 // 0x0003 line=8 248 // 0x0005 line=9 249 // 0x0006 line=11 250 // 0x000b line=12 251 // 0x000e line=18 252 // 0x0010 line=19 253 // 0x0013 line=21 254 // 0x0014 line=13 255 // 0x0015 line=14 256 // 0x0017 line=15 257 // 0x001f line=18 258 // 0x0021 line=19 259 // 0x0025 line=20 260 // 0x0026 line=18 261 // 0x0029 line=19 262 // 0x002d line=18 263 // 0x0030 line=13 264 // locals : 265 // 0x0006 - 0x000b reg=2 y Ljava/lang/Object; 266 // 0x000b - 0x0013 reg=3 y Ljava/lang/Object; 267 // 0x0014 - 0x0015 reg=2 y Ljava/lang/Object; 268 // 0x0015 - 0x0026 reg=0 ex Ljava/lang/Exception; 269 // 0x002d - 0x0032 reg=3 y Ljava/lang/Object; 270 // 0x0005 - 0x0033 reg=1 x [Ljava/lang/Object; 271 // 0x0032 - 0x0033 reg=2 y Ljava/lang/Object; 272 // 0x0000 - 0x0033 reg=8 this LReferenceMap; 273 274 extern "C" JNIEXPORT jint JNICALL Java_Main_refmap(JNIEnv*, jobject, jint count) { 275 // Visitor 276 ScopedObjectAccess soa(Thread::Current()); 277 ReferenceMap2Visitor mapper(soa.Self()); 278 mapper.WalkStack(); 279 280 return count + 1; 281 } 282 283 } // namespace art 284
