/* * 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 #include "UniquePtr.h" #include "class_linker.h" #include "dex_file-inl.h" #include "gc_map.h" #include "mirror/abstract_method.h" #include "mirror/abstract_method-inl.h" #include "mirror/class-inl.h" #include "mirror/object_array-inl.h" #include "object_utils.h" #include "scoped_thread_state_change.h" #include "thread.h" #include "jni.h" #include "verifier/method_verifier.h" namespace art { #define IS_IN_REF_BITMAP(mh, ref_bitmap, reg) \ ( ((reg) < mh.GetCodeItem()->registers_size_) && \ (( *((ref_bitmap) + (reg)/8) >> ((reg) % 8) ) & 0x01) ) #define CHECK_REGS_CONTAIN_REFS(...) \ do { \ int t[] = {__VA_ARGS__}; \ int t_size = sizeof(t) / sizeof(*t); \ for (int i = 0; i < t_size; ++i) \ CHECK(IS_IN_REF_BITMAP(mh, ref_bitmap, t[i])) \ << "Error: Reg @ " << i << "-th argument is not in GC map"; \ } while (false) struct ReferenceMap2Visitor : public StackVisitor { explicit ReferenceMap2Visitor(Thread* thread) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) : StackVisitor(thread, NULL) { } bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) { mirror::AbstractMethod* m = GetMethod(); if (!m || m->IsNative() || m->IsRuntimeMethod() || IsShadowFrame()) { return true; } LOG(INFO) << "At " << PrettyMethod(m, false); NativePcOffsetToReferenceMap map(m->GetNativeGcMap()); if (m->IsCalleeSaveMethod()) { LOG(WARNING) << "no PC for " << PrettyMethod(m); return true; } const uint8_t* ref_bitmap = NULL; MethodHelper mh(m); std::string m_name(mh.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) { ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToFirstNativeSafepointPc(0x03U))); CHECK(ref_bitmap); CHECK_REGS_CONTAIN_REFS(8); // v8: this ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToFirstNativeSafepointPc(0x06U))); CHECK(ref_bitmap); CHECK_REGS_CONTAIN_REFS(8, 1); // v8: this, v1: x ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToFirstNativeSafepointPc(0x08U))); CHECK(ref_bitmap); CHECK_REGS_CONTAIN_REFS(8, 3, 1); // v8: this, v3: y, v1: x ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToFirstNativeSafepointPc(0x0cU))); CHECK(ref_bitmap); CHECK_REGS_CONTAIN_REFS(8, 3, 1); // v8: this, v3: y, v1: x ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToFirstNativeSafepointPc(0x0eU))); CHECK(ref_bitmap); CHECK_REGS_CONTAIN_REFS(8, 3, 1); // v8: this, v3: y, v1: x ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToFirstNativeSafepointPc(0x10U))); CHECK(ref_bitmap); CHECK_REGS_CONTAIN_REFS(8, 3, 1); // v8: this, v3: y, v1: x ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToFirstNativeSafepointPc(0x13U))); CHECK(ref_bitmap); // 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 // Detaled 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 ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToFirstNativeSafepointPc(0x18U))); CHECK(ref_bitmap); CHECK_REGS_CONTAIN_REFS(8, 2, 1, 0); // v8: this, v2: y, v1: x, v0: ex ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToFirstNativeSafepointPc(0x1aU))); CHECK(ref_bitmap); CHECK_REGS_CONTAIN_REFS(8, 5, 2, 1, 0); // v8: this, v5: x[1], v2: y, v1: x, v0: ex ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToFirstNativeSafepointPc(0x1dU))); CHECK(ref_bitmap); CHECK_REGS_CONTAIN_REFS(8, 5, 2, 1, 0); // v8: this, v5: x[1], v2: y, v1: x, v0: ex ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToFirstNativeSafepointPc(0x1fU))); CHECK(ref_bitmap); // v5 is removed from the root set because there is a "merge" operation. // See 0015: if-nez v2, 001f. CHECK_REGS_CONTAIN_REFS(8, 2, 1, 0); // v8: this, v2: y, v1: x, v0: ex ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToFirstNativeSafepointPc(0x21U))); CHECK(ref_bitmap); CHECK_REGS_CONTAIN_REFS(8, 2, 1, 0); // v8: this, v2: y, v1: x, v0: ex ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToFirstNativeSafepointPc(0x27U))); CHECK(ref_bitmap); CHECK_REGS_CONTAIN_REFS(8, 4, 2, 1); // v8: this, v4: ex, v2: y, v1: x ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToFirstNativeSafepointPc(0x29U))); CHECK(ref_bitmap); CHECK_REGS_CONTAIN_REFS(8, 4, 2, 1); // v8: this, v4: ex, v2: y, v1: x ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToFirstNativeSafepointPc(0x2cU))); CHECK(ref_bitmap); CHECK_REGS_CONTAIN_REFS(8, 4, 2, 1); // v8: this, v4: ex, v2: y, v1: x ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToFirstNativeSafepointPc(0x2fU))); CHECK(ref_bitmap); CHECK_REGS_CONTAIN_REFS(8, 4, 3, 2, 1); // v8: this, v4: ex, v3: y, v2: y, v1: x ref_bitmap = map.FindBitMap(m->NativePcOffset(m->ToFirstNativeSafepointPc(0x32U))); CHECK(ref_bitmap); CHECK_REGS_CONTAIN_REFS(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:[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], // |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_ReferenceMap_refmap(JNIEnv*, jobject, jint count) { // Visitor ScopedObjectAccess soa(Thread::Current()); ReferenceMap2Visitor mapper(soa.Self()); mapper.WalkStack(); return count + 1; } }