/* * Copyright (C) 2011 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "art_method-inl.h" #include "check_reference_map_visitor.h" #include "jni.h" namespace art { #define CHECK_REGS_CONTAIN_REFS(dex_pc, abort_if_not_found, ...) do { \ int t[] = {__VA_ARGS__}; \ int t_size = sizeof(t) / sizeof(*t); \ const OatQuickMethodHeader* method_header = GetCurrentOatQuickMethodHeader(); \ uintptr_t native_quick_pc = method_header->ToNativeQuickPc(GetMethod(), \ dex_pc, \ /* is_catch_handler */ false, \ abort_if_not_found); \ if (native_quick_pc != UINTPTR_MAX) { \ CheckReferences(t, \ t_size, \ dex_pc, \ method_header->NativeQuickPcOffset(native_quick_pc), \ /* search_for_valid_stack_map= */ true); \ } \ } while (false); struct ReferenceMap2Visitor : public CheckReferenceMapVisitor { explicit ReferenceMap2Visitor(Thread* thread) REQUIRES_SHARED(Locks::mutator_lock_) : CheckReferenceMapVisitor(thread) {} bool VisitFrame() override REQUIRES_SHARED(Locks::mutator_lock_) { if (CheckReferenceMapVisitor::VisitFrame()) { return true; } ArtMethod* m = GetMethod(); std::string m_name(m->GetName()); // Given the method name and the number of times the method has been called, // we know the Dex registers with live reference values. Assert that what we // find is what is expected. if (m_name.compare("f") == 0) { CHECK_REGS_CONTAIN_REFS(0x03U, true, 8); // v8: this CHECK_REGS_CONTAIN_REFS(0x06U, true, 8, 1); // v8: this, v1: x CHECK_REGS_CONTAIN_REFS(0x0cU, true, 8, 3, 1); // v8: this, v3: y, v1: x CHECK_REGS_CONTAIN_REFS(0x10U, true, 8, 3, 1); // v8: this, v3: y, v1: x // v2 is added because of the instruction at DexPC 0024. Object merges with 0 is Object. See: // 0024: move-object v3, v2 // 0025: goto 0013 // Detailed dex instructions for ReferenceMap.java are at the end of this function. // CHECK_REGS_CONTAIN_REFS(8, 3, 2, 1); // v8: this, v3: y, v2: y, v1: x // We eliminate the non-live registers at a return, so only v3 is live. // Note that it is OK for a compiler to not have a dex map at this dex PC because // a return is not necessarily a safepoint. CHECK_REGS_CONTAIN_REFS(0x13U, false, 3); // v3: y // Note that v0: ex can be eliminated because it's a dead merge of two different exceptions. CHECK_REGS_CONTAIN_REFS(0x18U, true, 8, 2, 1); // v8: this, v2: y, v1: x (dead v0: ex) CHECK_REGS_CONTAIN_REFS(0x21U, true, 8, 2, 1); // v8: this, v2: y, v1: x (dead v0: ex) if (!GetCurrentOatQuickMethodHeader()->IsOptimized()) { CHECK_REGS_CONTAIN_REFS(0x27U, true, 8, 4, 2, 1); // v8: this, v4: ex, v2: y, v1: x } CHECK_REGS_CONTAIN_REFS(0x29U, true, 8, 4, 2, 1); // v8: this, v4: ex, v2: y, v1: x CHECK_REGS_CONTAIN_REFS(0x2cU, true, 8, 4, 2, 1); // v8: this, v4: ex, v2: y, v1: x // Note that it is OK for a compiler to not have a dex map at these two dex PCs because // a goto is not necessarily a safepoint. CHECK_REGS_CONTAIN_REFS(0x2fU, false, 8, 4, 3, 2, 1); // v8: this, v4: ex, v3: y, v2: y, v1: x CHECK_REGS_CONTAIN_REFS(0x32U, false, 8, 3, 2, 1, 0); // v8: this, v3: y, v2: y, v1: x, v0: ex } return true; } }; // Dex instructions for the function 'f' in ReferenceMap.java // Virtual methods - // #0 : (in LReferenceMap;) // name : 'f' // type : '()Ljava/lang/Object;' // access : 0x0000 () // code - // registers : 9 // ins : 1 // outs : 2 // insns size : 51 16-bit code units // |[0001e8] ReferenceMap.f:()Ljava/lang/Object; // |0000: const/4 v4, #int 2 // #2 // |0001: const/4 v7, #int 0 // #0 // |0002: const/4 v6, #int 1 // #1 // // 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], // |0003: new-array v1, v4, [Ljava/lang/Object; // type@0007 // |0005: const/4 v2, #int 0 // #0 // 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], // |0006: new-instance v3, Ljava/lang/Object; // type@0003 // [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], // |0008: +invoke-object-init/range {}, Ljava/lang/Object;.:()V // method@0005 // |000b: const/4 v4, #int 2 // #2 // 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], // |000c: aput-object v3, v1, v4 // 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], // |000e: aput-object v3, v1, v6 // 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], // |0010: +invoke-virtual-quick {v8, v7}, [000c] // vtable #000c // 0:[Conflict],1:[Conflict],2:[Conflict],3:[Reference: java.lang.Object],4:[Conflict],5:[Conflict],6:[Conflict],7:[Conflict],8:[Conflict], // |0013: return-object v3 // |0014: move-exception v0 // 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], // |0015: if-nez v2, 001f // +000a // |0017: const/4 v4, #int 1 // #1 // 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], // |0018: new-instance v5, Ljava/lang/Object; // type@0003 // 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], // |001a: +invoke-object-init/range {}, Ljava/lang/Object;.:()V // method@0005 // 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], // |001d: aput-object v5, v1, v4 // 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], // |001f: aput-object v2, v1, v6 // 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], // |0021: +invoke-virtual-quick {v8, v7}, [000c] // vtable #000c // |0024: move-object v3, v2 // 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], // |0025: goto 0013 // -0012 // |0026: move-exception v4 // 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], // |0027: aput-object v2, v1, v6 // 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], // |0029: +invoke-virtual-quick {v8, v7}, [000c] // vtable #000c // 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], // |002c: throw v4 // |002d: move-exception v4 // |002e: move-object v2, v3 // 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], // |002f: goto 0027 // -0008 // |0030: move-exception v0 // |0031: move-object v2, v3 // 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], // |0032: goto 0015 // -001d // catches : 3 // 0x0006 - 0x000b // Ljava/lang/Exception; -> 0x0014 // -> 0x0026 // 0x000c - 0x000e // Ljava/lang/Exception; -> 0x0030 // -> 0x002d // 0x0018 - 0x001f // -> 0x0026 // positions : // 0x0003 line=8 // 0x0005 line=9 // 0x0006 line=11 // 0x000b line=12 // 0x000e line=18 // 0x0010 line=19 // 0x0013 line=21 // 0x0014 line=13 // 0x0015 line=14 // 0x0017 line=15 // 0x001f line=18 // 0x0021 line=19 // 0x0025 line=20 // 0x0026 line=18 // 0x0029 line=19 // 0x002d line=18 // 0x0030 line=13 // locals : // 0x0006 - 0x000b reg=2 y Ljava/lang/Object; // 0x000b - 0x0013 reg=3 y Ljava/lang/Object; // 0x0014 - 0x0015 reg=2 y Ljava/lang/Object; // 0x0015 - 0x0026 reg=0 ex Ljava/lang/Exception; // 0x002d - 0x0032 reg=3 y Ljava/lang/Object; // 0x0005 - 0x0033 reg=1 x [Ljava/lang/Object; // 0x0032 - 0x0033 reg=2 y Ljava/lang/Object; // 0x0000 - 0x0033 reg=8 this LReferenceMap; extern "C" JNIEXPORT jint JNICALL Java_Main_refmap(JNIEnv*, jobject, jint count) { // Visitor ScopedObjectAccess soa(Thread::Current()); ReferenceMap2Visitor mapper(soa.Self()); mapper.WalkStack(); return count + 1; } } // namespace art