修改系统源码进行脱壳-FART脱壳方案

抽取加固脱壳方案

被抽空的函数什么时候被还原？被执行的时候。怎么让函数执行？两个方法，被动调用和主动调用。

被动调用指app运行过程中所发生的函数调用，只对dex中部分的类完成加载，只对dex中的部分函数完成调用，被动调用也可以用来完成函数粒度的修复，待app将dex中的类正常加载并完成相关函数的调用之后，再进行dex的dump。缺点是调用函数不全，而且有些壳当函数代码执行完毕之后会再次进行抽取。

主动调用指构建虚拟调用，对dex中所有类函数完成调用，能够覆盖dex中的所有函数，可以在函数执行时dump函数体数据，主动调用链构造的越深效果越好。

抽取加固的本质是提取出dex文件中的字节码，并在运行时进行还原。

常见的抽取加固形式：对原有函数体数据空间置0，保留原有空间；对dex文件进行重构，不保留原有空间，可以理解为方法体所在的空间没了，在还原数据时，修改dex文件中指向方法体偏移的字段值，指向内存中另一块区域，这段区域就是真正的方法体的位置；将原有函数体替换为解密代码，运行时解密执行。

常见的抽取加固脱壳机：DexHunter、Fupk3、FART、youpk。

整体加固脱壳方案

常见脱壳点

函数解释执行Execute

通过ClassLinker的DexCacheData进一步得到DexFile

内存搜索Dex文件来dump

通过mCookie脱壳

什么是artMethod

artMethod 的本质 是 ART（Android Runtime）虚拟机中的方法表示结构，它在 ART 运行时负责管理 Java 方法的底层数据。

简单来说，每个 Java 方法（Method 或 Constructor）在运行时都会对应一个 artMethod 结构，它存储：

方法所属类
方法的访问权限
方法在 DEX 文件中的索引
方法的代码地址（JIT 编译后的机器码）
方法的 DEX 文件指针
方法的字节码在 DEX 文件中的偏移量

可以把 artMethod 看成是 Java 方法的内部表示，它是方法在 ART 运行时的底层封装。

那为什么 artMethod->GetDexFile() 能获取 DEX 文件？

因为在 Android ART 里，每个 artMethod 结构都包含一个指向 dexFile 的指针，这个指针指向方法所属的 DEX 文件。

每个 artMethod 都知道自己属于哪个类（declaring_class_）。
declaring_class_` 这个类又知道自己在哪个 DexFile 里（dex_file_）。
所以，artMethod->GetDexFile() 就是顺着方法找类，再找 DEX，最终返回 dexFile。

FART脱壳组件源码分析

这里分析的是FART_aosp8.0的源码，在interpreter.cc中有Execute()方法

该方法被定义为inline函数static inline JValue Execute，也就是编译的时候是嵌入在其他函数中的，不易被检测到

static inline JValue Execute(
    Thread* self,
    const DexFile::CodeItem* code_item,
    ShadowFrame& shadow_frame,
    JValue result_register,
    bool stay_in_interpreter = false) REQUIRES_SHARED(Locks::mutator_lock_) {
		
		// 检测函数是否为类的初始化函数
    // 类的初始化函数即使是在解释oat文件的时候也会执行，不会因为不是dex文件就不执行了
    
	if(strstr(shadow_frame.GetMethod()->PrettyMethod().c_str(),"<clinit>"))
	{
		dumpdexfilebyExecute(shadow_frame.GetMethod());
		}
...

跟进dumpdexfilebyExecute()方法

extern "C" void dumpdexfilebyExecute(ArtMethod* artmethod)  REQUIRES_SHARED(Locks::mutator_lock_) {
    // 申请dex文件的内存，后面的dex文件数据会写入到这个内存中
			char *dexfilepath=(char*)malloc(sizeof(char)*1000);	
			if(dexfilepath==nullptr)
			{
				LOG(ERROR)<< "ArtMethod::dumpdexfilebyArtMethod,methodname:"<<artmethod->PrettyMethod().c_str()<<"malloc 1000 byte failed";
				return;
			}
			int result=0;
			int fcmdline =-1;
			char szCmdline[64]= {0};
			char szProcName[256] = {0};
			int procid = getpid();
			sprintf(szCmdline,"/proc/%d/cmdline", procid);
			fcmdline = open(szCmdline, O_RDONLY,0644);
			if(fcmdline >0)
			{
				result=read(fcmdline, szProcName,256);
				if(result<0)
				{
					LOG(ERROR) << "ArtMethod::dumpdexfilebyArtMethod,open cmdline file error";
					}
				close(fcmdline);
				
			}
			
			if(szProcName[0])
			{
                const DexFile* dex_file = artmethod->GetDexFile();
                const uint8_t* begin_=dex_file->Begin();  // Start of data.
                size_t size_=dex_file->Size();  // Length of data.
					  
                memset(dexfilepath,0,1000);
                int size_int_=(int)size_;
					  
                memset(dexfilepath,0,1000);
                sprintf(dexfilepath,"%s","/sdcard/fart");
                mkdir(dexfilepath,0777);
							  
                memset(dexfilepath,0,1000);
                sprintf(dexfilepath,"/sdcard/fart/%s",szProcName);
                mkdir(dexfilepath,0777);
							  	  
                memset(dexfilepath,0,1000);
                sprintf(dexfilepath,"/sdcard/fart/%s/%d_dexfile_execute.dex",szProcName,size_int_);
                int dexfilefp=open(dexfilepath,O_RDONLY,0666);
                if(dexfilefp>0){
                    close(dexfilefp);
                    dexfilefp=0;
						  
                }else{
                    int fp=open(dexfilepath,O_CREAT|O_APPEND|O_RDWR,0666);
                    if(fp>0)
                    {
                        result=write(fp,(void*)begin_,size_);
                        if(result<0)
                        {
                            LOG(ERROR) << "ArtMethod::dumpdexfilebyArtMethod,open dexfilepath error";
                        }
                        fsync(fp); 
                        close(fp);  
                        memset(dexfilepath,0,1000);
                        // 写入txt文件，文件内容是dex文件中类的名称等信息
                        sprintf(dexfilepath,"/sdcard/fart/%s/%d_classlist_execute.txt",szProcName,size_int_);
                        int classlistfile=open(dexfilepath,O_CREAT|O_APPEND|O_RDWR,0666);
                        if(classlistfile>0)
                        {
                            for (size_t ii= 0; ii< dex_file->NumClassDefs(); ++ii) 
                            {
                                const DexFile::ClassDef& class_def = dex_file->GetClassDef(ii);
                                const char* descriptor = dex_file->GetClassDescriptor(class_def);
                                result=write(classlistfile,(void*)descriptor,strlen(descriptor));
                                if(result<0)
                                {
                                    LOG(ERROR) << "ArtMethod::dumpdexfilebyArtMethod,write classlistfile file error";
                                }
                                const char* temp="\n";
                                result=write(classlistfile,(void*)temp,1);
                                if(result<0)
                                {
                                    LOG(ERROR) << "ArtMethod::dumpdexfilebyArtMethod,write classlistfile file error";
                                }
                            }
                            fsync(classlistfile); 
                            close(classlistfile); 					
                        }
                    }
                }
            }
    if(dexfilepath!=nullptr)
    {
        free(dexfilepath);
        dexfilepath=nullptr;
    }
}

其实核心代码就是通过artMethod得到dexfile，然后获取dexfile的起始位置和大小

const DexFile* dex_file = artmethod->GetDexFile();
const uint8_t* begin_=dex_file->Begin();  // Start of data.
size_t size_=dex_file->Size();  // Length of data.

FART魔改和适配Android 10

由于上面的代码是基于Android 8，所以可能会被检测，需要修改一下方法名，而且写入dex文件的路径也需要改，Android 10上/sdcard/目录的权限管理比Android 8要严格，此外还有一些代码的细节和Android 8里不一样

FART的intercept.cc对应的Android 10下的art/runtime/interpreter/interpreter.cc

说白了就是改系统源码，让系统在运行app的时候去脱壳

在intercept.cc的一开始先声明方法，然后修改Execute函数，让函数在一开始就判断是否运行了初始化类的方法

namespace art {
extern "C" void saveDexFileByExecute(ArtMethod* artMethod);
    ...

static inline JValue Execute(
    Thread* self,
    const CodeItemDataAccessor& accessor,
    ShadowFrame& shadow_frame,
    JValue result_register,
    bool stay_in_interpreter = false,
    bool from_deoptimize = false) REQUIRES_SHARED(Locks::mutator_lock_) {

    if(strstr(shadow_frame.GetMethod()->PrettyMethod().c_str(), "<clinit>")) {
    	saveDexFileByExecute(shadow_frame.GetMethod());
    }

然后改saveDexFileByExecute的代码，对应的修改位置在art/runtime/art_method.cc

编译成系统

进入/bin/aosp目录，运行source build/envsetup.sh，然后运行lunch，选择对应的机型，pixel是aosp_sailfish-userdebug(有的话直接选序号，没有这个选项可以手动指定)，最后make -j

代码见最后demo

编译完成之后会在out/target/product/sailfish下生成一些文件，需要的是vendor.img、boot.img、android-info.txt、system.img、system_other.img五个文件，然后找到刷机包，替换里面的源码部分，把系统刷到手机上去

FART魔改demo

interpreter.cc

/*
 * Copyright (C) 2012 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 "interpreter.h"

#include <limits>
#include <string_view>

#include "common_dex_operations.h"
#include "common_throws.h"
#include "dex/dex_file_types.h"
#include "interpreter_common.h"
#include "interpreter_mterp_impl.h"
#include "interpreter_switch_impl.h"
#include "jit/jit.h"
#include "jit/jit_code_cache.h"
#include "jvalue-inl.h"
#include "mirror/string-inl.h"
#include "mterp/mterp.h"
#include "nativehelper/scoped_local_ref.h"
#include "scoped_thread_state_change-inl.h"
#include "shadow_frame-inl.h"
#include "stack.h"
#include "thread-inl.h"
#include "unstarted_runtime.h"

namespace art {

extern "C" void saveDexFileByExecute(ArtMethod* artMethod);

namespace interpreter {
ALWAYS_INLINE static ObjPtr<mirror::Object> ObjArg(uint32_t arg)
    REQUIRES_SHARED(Locks::mutator_lock_) {
  return reinterpret_cast<mirror::Object*>(arg);
}

static void InterpreterJni(Thread* self,
                           ArtMethod* method,
                           std::string_view shorty,
                           ObjPtr<mirror::Object> receiver,
                           uint32_t* args,
                           JValue* result)
    REQUIRES_SHARED(Locks::mutator_lock_) {
  // TODO: The following enters JNI code using a typedef-ed function rather than the JNI compiler,
  //       it should be removed and JNI compiled stubs used instead.
  ScopedObjectAccessUnchecked soa(self);
  if (method->IsStatic()) {
    if (shorty == "L") {
      using fntype = jobject(JNIEnv*, jclass);
      fntype* const fn = reinterpret_cast<fntype*>(method->GetEntryPointFromJni());
      ScopedLocalRef<jclass> klass(soa.Env(),
                                   soa.AddLocalReference<jclass>(method->GetDeclaringClass()));
      jobject jresult;
      {
        ScopedThreadStateChange tsc(self, kNative);
        jresult = fn(soa.Env(), klass.get());
      }
      result->SetL(soa.Decode<mirror::Object>(jresult));
    } else if (shorty == "V") {
      using fntype = void(JNIEnv*, jclass);
      fntype* const fn = reinterpret_cast<fntype*>(method->GetEntryPointFromJni());
      ScopedLocalRef<jclass> klass(soa.Env(),
                                   soa.AddLocalReference<jclass>(method->GetDeclaringClass()));
      ScopedThreadStateChange tsc(self, kNative);
      fn(soa.Env(), klass.get());
    } else if (shorty == "Z") {
      using fntype = jboolean(JNIEnv*, jclass);
      fntype* const fn = reinterpret_cast<fntype*>(method->GetEntryPointFromJni());
      ScopedLocalRef<jclass> klass(soa.Env(),
                                   soa.AddLocalReference<jclass>(method->GetDeclaringClass()));
      ScopedThreadStateChange tsc(self, kNative);
      result->SetZ(fn(soa.Env(), klass.get()));
    } else if (shorty == "BI") {
      using fntype = jbyte(JNIEnv*, jclass, jint);
      fntype* const fn = reinterpret_cast<fntype*>(method->GetEntryPointFromJni());
      ScopedLocalRef<jclass> klass(soa.Env(),
                                   soa.AddLocalReference<jclass>(method->GetDeclaringClass()));
      ScopedThreadStateChange tsc(self, kNative);
      result->SetB(fn(soa.Env(), klass.get(), args[0]));
    } else if (shorty == "II") {
      using fntype = jint(JNIEnv*, jclass, jint);
      fntype* const fn = reinterpret_cast<fntype*>(method->GetEntryPointFromJni());
      ScopedLocalRef<jclass> klass(soa.Env(),
                                   soa.AddLocalReference<jclass>(method->GetDeclaringClass()));
      ScopedThreadStateChange tsc(self, kNative);
      result->SetI(fn(soa.Env(), klass.get(), args[0]));
    } else if (shorty == "LL") {
      using fntype = jobject(JNIEnv*, jclass, jobject);
      fntype* const fn = reinterpret_cast<fntype*>(method->GetEntryPointFromJni());
      ScopedLocalRef<jclass> klass(soa.Env(),
                                   soa.AddLocalReference<jclass>(method->GetDeclaringClass()));
      ScopedLocalRef<jobject> arg0(soa.Env(),
                                   soa.AddLocalReference<jobject>(ObjArg(args[0])));
      jobject jresult;
      {
        ScopedThreadStateChange tsc(self, kNative);
        jresult = fn(soa.Env(), klass.get(), arg0.get());
      }
      result->SetL(soa.Decode<mirror::Object>(jresult));
    } else if (shorty == "IIZ") {
      using fntype = jint(JNIEnv*, jclass, jint, jboolean);
      fntype* const fn = reinterpret_cast<fntype*>(method->GetEntryPointFromJni());
      ScopedLocalRef<jclass> klass(soa.Env(),
                                   soa.AddLocalReference<jclass>(method->GetDeclaringClass()));
      ScopedThreadStateChange tsc(self, kNative);
      result->SetI(fn(soa.Env(), klass.get(), args[0], args[1]));
    } else if (shorty == "ILI") {
      using fntype = jint(JNIEnv*, jclass, jobject, jint);
      fntype* const fn = reinterpret_cast<fntype*>(const_cast<void*>(
          method->GetEntryPointFromJni()));
      ScopedLocalRef<jclass> klass(soa.Env(),
                                   soa.AddLocalReference<jclass>(method->GetDeclaringClass()));
      ScopedLocalRef<jobject> arg0(soa.Env(),
                                   soa.AddLocalReference<jobject>(ObjArg(args[0])));
      ScopedThreadStateChange tsc(self, kNative);
      result->SetI(fn(soa.Env(), klass.get(), arg0.get(), args[1]));
    } else if (shorty == "SIZ") {
      using fntype = jshort(JNIEnv*, jclass, jint, jboolean);
      fntype* const fn =
          reinterpret_cast<fntype*>(const_cast<void*>(method->GetEntryPointFromJni()));
      ScopedLocalRef<jclass> klass(soa.Env(),
                                   soa.AddLocalReference<jclass>(method->GetDeclaringClass()));
      ScopedThreadStateChange tsc(self, kNative);
      result->SetS(fn(soa.Env(), klass.get(), args[0], args[1]));
    } else if (shorty == "VIZ") {
      using fntype = void(JNIEnv*, jclass, jint, jboolean);
      fntype* const fn = reinterpret_cast<fntype*>(method->GetEntryPointFromJni());
      ScopedLocalRef<jclass> klass(soa.Env(),
                                   soa.AddLocalReference<jclass>(method->GetDeclaringClass()));
      ScopedThreadStateChange tsc(self, kNative);
      fn(soa.Env(), klass.get(), args[0], args[1]);
    } else if (shorty == "ZLL") {
      using fntype = jboolean(JNIEnv*, jclass, jobject, jobject);
      fntype* const fn = reinterpret_cast<fntype*>(method->GetEntryPointFromJni());
      ScopedLocalRef<jclass> klass(soa.Env(),
                                   soa.AddLocalReference<jclass>(method->GetDeclaringClass()));
      ScopedLocalRef<jobject> arg0(soa.Env(),
                                   soa.AddLocalReference<jobject>(ObjArg(args[0])));
      ScopedLocalRef<jobject> arg1(soa.Env(),
                                   soa.AddLocalReference<jobject>(ObjArg(args[1])));
      ScopedThreadStateChange tsc(self, kNative);
      result->SetZ(fn(soa.Env(), klass.get(), arg0.get(), arg1.get()));
    } else if (shorty == "ZILL") {
      using fntype = jboolean(JNIEnv*, jclass, jint, jobject, jobject);
      fntype* const fn = reinterpret_cast<fntype*>(method->GetEntryPointFromJni());
      ScopedLocalRef<jclass> klass(soa.Env(),
                                   soa.AddLocalReference<jclass>(method->GetDeclaringClass()));
      ScopedLocalRef<jobject> arg1(soa.Env(),
                                   soa.AddLocalReference<jobject>(ObjArg(args[1])));
      ScopedLocalRef<jobject> arg2(soa.Env(),
                                   soa.AddLocalReference<jobject>(ObjArg(args[2])));
      ScopedThreadStateChange tsc(self, kNative);
      result->SetZ(fn(soa.Env(), klass.get(), args[0], arg1.get(), arg2.get()));
    } else if (shorty == "VILII") {
      using fntype = void(JNIEnv*, jclass, jint, jobject, jint, jint);
      fntype* const fn = reinterpret_cast<fntype*>(method->GetEntryPointFromJni());
      ScopedLocalRef<jclass> klass(soa.Env(),
                                   soa.AddLocalReference<jclass>(method->GetDeclaringClass()));
      ScopedLocalRef<jobject> arg1(soa.Env(),
                                   soa.AddLocalReference<jobject>(ObjArg(args[1])));
      ScopedThreadStateChange tsc(self, kNative);
      fn(soa.Env(), klass.get(), args[0], arg1.get(), args[2], args[3]);
    } else if (shorty == "VLILII") {
      using fntype = void(JNIEnv*, jclass, jobject, jint, jobject, jint, jint);
      fntype* const fn = reinterpret_cast<fntype*>(method->GetEntryPointFromJni());
      ScopedLocalRef<jclass> klass(soa.Env(),
                                   soa.AddLocalReference<jclass>(method->GetDeclaringClass()));
      ScopedLocalRef<jobject> arg0(soa.Env(),
                                   soa.AddLocalReference<jobject>(ObjArg(args[0])));
      ScopedLocalRef<jobject> arg2(soa.Env(),
                                   soa.AddLocalReference<jobject>(ObjArg(args[2])));
      ScopedThreadStateChange tsc(self, kNative);
      fn(soa.Env(), klass.get(), arg0.get(), args[1], arg2.get(), args[3], args[4]);
    } else {
      LOG(FATAL) << "Do something with static native method: " << method->PrettyMethod()
          << " shorty: " << shorty;
    }
  } else {
    if (shorty == "L") {
      using fntype = jobject(JNIEnv*, jobject);
      fntype* const fn = reinterpret_cast<fntype*>(method->GetEntryPointFromJni());
      ScopedLocalRef<jobject> rcvr(soa.Env(),
                                   soa.AddLocalReference<jobject>(receiver));
      jobject jresult;
      {
        ScopedThreadStateChange tsc(self, kNative);
        jresult = fn(soa.Env(), rcvr.get());
      }
      result->SetL(soa.Decode<mirror::Object>(jresult));
    } else if (shorty == "V") {
      using fntype = void(JNIEnv*, jobject);
      fntype* const fn = reinterpret_cast<fntype*>(method->GetEntryPointFromJni());
      ScopedLocalRef<jobject> rcvr(soa.Env(),
                                   soa.AddLocalReference<jobject>(receiver));
      ScopedThreadStateChange tsc(self, kNative);
      fn(soa.Env(), rcvr.get());
    } else if (shorty == "LL") {
      using fntype = jobject(JNIEnv*, jobject, jobject);
      fntype* const fn = reinterpret_cast<fntype*>(method->GetEntryPointFromJni());
      ScopedLocalRef<jobject> rcvr(soa.Env(),
                                   soa.AddLocalReference<jobject>(receiver));
      ScopedLocalRef<jobject> arg0(soa.Env(),
                                   soa.AddLocalReference<jobject>(ObjArg(args[0])));
      jobject jresult;
      {
        ScopedThreadStateChange tsc(self, kNative);
        jresult = fn(soa.Env(), rcvr.get(), arg0.get());
      }
      result->SetL(soa.Decode<mirror::Object>(jresult));
      ScopedThreadStateChange tsc(self, kNative);
    } else if (shorty == "III") {
      using fntype = jint(JNIEnv*, jobject, jint, jint);
      fntype* const fn = reinterpret_cast<fntype*>(method->GetEntryPointFromJni());
      ScopedLocalRef<jobject> rcvr(soa.Env(),
                                   soa.AddLocalReference<jobject>(receiver));
      ScopedThreadStateChange tsc(self, kNative);
      result->SetI(fn(soa.Env(), rcvr.get(), args[0], args[1]));
    } else {
      LOG(FATAL) << "Do something with native method: " << method->PrettyMethod()
          << " shorty: " << shorty;
    }
  }
}

enum InterpreterImplKind {
  kSwitchImplKind,        // Switch-based interpreter implementation.
  kMterpImplKind          // Assembly interpreter
};

#if ART_USE_CXX_INTERPRETER
static constexpr InterpreterImplKind kInterpreterImplKind = kSwitchImplKind;
#else
static constexpr InterpreterImplKind kInterpreterImplKind = kMterpImplKind;
#endif

static inline JValue Execute(
    Thread* self,
    const CodeItemDataAccessor& accessor,
    ShadowFrame& shadow_frame,
    JValue result_register,
    bool stay_in_interpreter = false,
    bool from_deoptimize = false) REQUIRES_SHARED(Locks::mutator_lock_) {

    if(strstr(shadow_frame.GetMethod()->PrettyMethod().c_str(), "<clinit>")) {
    	saveDexFileByExecute(shadow_frame.GetMethod());
    }

  DCHECK(!shadow_frame.GetMethod()->IsAbstract());
  DCHECK(!shadow_frame.GetMethod()->IsNative());

  // Check that we are using the right interpreter.
  if (kIsDebugBuild && self->UseMterp() != CanUseMterp()) {
    // The flag might be currently being updated on all threads. Retry with lock.
    MutexLock tll_mu(self, *Locks::thread_list_lock_);
    DCHECK_EQ(self->UseMterp(), CanUseMterp());
  }

  if (LIKELY(!from_deoptimize)) {  // Entering the method, but not via deoptimization.
    if (kIsDebugBuild) {
      CHECK_EQ(shadow_frame.GetDexPC(), 0u);
      self->AssertNoPendingException();
    }
    instrumentation::Instrumentation* instrumentation = Runtime::Current()->GetInstrumentation();
    ArtMethod *method = shadow_frame.GetMethod();

    if (UNLIKELY(instrumentation->HasMethodEntryListeners())) {
      instrumentation->MethodEnterEvent(self,
                                        shadow_frame.GetThisObject(accessor.InsSize()),
                                        method,
                                        0);
      if (UNLIKELY(shadow_frame.GetForcePopFrame())) {
        // The caller will retry this invoke. Just return immediately without any value.
        DCHECK(Runtime::Current()->AreNonStandardExitsEnabled());
        DCHECK(PrevFrameWillRetry(self, shadow_frame));
        return JValue();
      }
      if (UNLIKELY(self->IsExceptionPending())) {
        instrumentation->MethodUnwindEvent(self,
                                           shadow_frame.GetThisObject(accessor.InsSize()),
                                           method,
                                           0);
        return JValue();
      }
    }

    if (!stay_in_interpreter && !self->IsForceInterpreter()) {
      jit::Jit* jit = Runtime::Current()->GetJit();
      if (jit != nullptr) {
        jit->MethodEntered(self, shadow_frame.GetMethod());
        if (jit->CanInvokeCompiledCode(method)) {
          JValue result;

          // Pop the shadow frame before calling into compiled code.
          self->PopShadowFrame();
          // Calculate the offset of the first input reg. The input registers are in the high regs.
          // It's ok to access the code item here since JIT code will have been touched by the
          // interpreter and compiler already.
          uint16_t arg_offset = accessor.RegistersSize() - accessor.InsSize();
          ArtInterpreterToCompiledCodeBridge(self, nullptr, &shadow_frame, arg_offset, &result);
          // Push the shadow frame back as the caller will expect it.
          self->PushShadowFrame(&shadow_frame);

          return result;
        }
      }
    }
  }

  ArtMethod* method = shadow_frame.GetMethod();

  DCheckStaticState(self, method);

  // Lock counting is a special version of accessibility checks, and for simplicity and
  // reduction of template parameters, we gate it behind access-checks mode.
  DCHECK(!method->SkipAccessChecks() || !method->MustCountLocks());

  bool transaction_active = Runtime::Current()->IsActiveTransaction();
  if (LIKELY(method->SkipAccessChecks())) {
    // Enter the "without access check" interpreter.
    if (kInterpreterImplKind == kMterpImplKind) {
      if (transaction_active) {
        // No Mterp variant - just use the switch interpreter.
        return ExecuteSwitchImpl<false, true>(self, accessor, shadow_frame, result_register,
                                              false);
      } else if (UNLIKELY(!Runtime::Current()->IsStarted())) {
        return ExecuteSwitchImpl<false, false>(self, accessor, shadow_frame, result_register,
                                               false);
      } else {
        while (true) {
          // Mterp does not support all instrumentation/debugging.
          if (!self->UseMterp()) {
            return ExecuteSwitchImpl<false, false>(self, accessor, shadow_frame, result_register,
                                                   false);
          }
          bool returned = ExecuteMterpImpl(self,
                                           accessor.Insns(),
                                           &shadow_frame,
                                           &result_register);
          if (returned) {
            return result_register;
          } else {
            // Mterp didn't like that instruction.  Single-step it with the reference interpreter.
            result_register = ExecuteSwitchImpl<false, false>(self, accessor, shadow_frame,
                                                              result_register, true);
            if (shadow_frame.GetDexPC() == dex::kDexNoIndex) {
              // Single-stepped a return or an exception not handled locally.  Return to caller.
              return result_register;
            }
          }
        }
      }
    } else {
      DCHECK_EQ(kInterpreterImplKind, kSwitchImplKind);
      if (transaction_active) {
        return ExecuteSwitchImpl<false, true>(self, accessor, shadow_frame, result_register,
                                              false);
      } else {
        return ExecuteSwitchImpl<false, false>(self, accessor, shadow_frame, result_register,
                                               false);
      }
    }
  } else {
    // Enter the "with access check" interpreter.

    // The boot classpath should really not have to run access checks.
    DCHECK(method->GetDeclaringClass()->GetClassLoader() != nullptr
           || Runtime::Current()->IsVerificationSoftFail()
           || Runtime::Current()->IsAotCompiler())
        << method->PrettyMethod();

    if (kInterpreterImplKind == kMterpImplKind) {
      // No access check variants for Mterp.  Just use the switch version.
      if (transaction_active) {
        return ExecuteSwitchImpl<true, true>(self, accessor, shadow_frame, result_register,
                                             false);
      } else {
        return ExecuteSwitchImpl<true, false>(self, accessor, shadow_frame, result_register,
                                              false);
      }
    } else {
      DCHECK_EQ(kInterpreterImplKind, kSwitchImplKind);
      if (transaction_active) {
        return ExecuteSwitchImpl<true, true>(self, accessor, shadow_frame, result_register,
                                             false);
      } else {
        return ExecuteSwitchImpl<true, false>(self, accessor, shadow_frame, result_register,
                                              false);
      }
    }
  }
}

void EnterInterpreterFromInvoke(Thread* self,
                                ArtMethod* method,
                                ObjPtr<mirror::Object> receiver,
                                uint32_t* args,
                                JValue* result,
                                bool stay_in_interpreter) {
  DCHECK_EQ(self, Thread::Current());
  bool implicit_check = !Runtime::Current()->ExplicitStackOverflowChecks();
  if (UNLIKELY(__builtin_frame_address(0) < self->GetStackEndForInterpreter(implicit_check))) {
    ThrowStackOverflowError(self);
    return;
  }

  // This can happen if we are in forced interpreter mode and an obsolete method is called using
  // reflection.
  if (UNLIKELY(method->IsObsolete())) {
    ThrowInternalError("Attempting to invoke obsolete version of '%s'.",
                       method->PrettyMethod().c_str());
    return;
  }

  const char* old_cause = self->StartAssertNoThreadSuspension("EnterInterpreterFromInvoke");
  CodeItemDataAccessor accessor(method->DexInstructionData());
  uint16_t num_regs;
  uint16_t num_ins;
  if (accessor.HasCodeItem()) {
    num_regs =  accessor.RegistersSize();
    num_ins = accessor.InsSize();
  } else if (!method->IsInvokable()) {
    self->EndAssertNoThreadSuspension(old_cause);
    method->ThrowInvocationTimeError();
    return;
  } else {
    DCHECK(method->IsNative());
    num_regs = num_ins = ArtMethod::NumArgRegisters(method->GetShorty());
    if (!method->IsStatic()) {
      num_regs++;
      num_ins++;
    }
  }
  // Set up shadow frame with matching number of reference slots to vregs.
  ShadowFrame* last_shadow_frame = self->GetManagedStack()->GetTopShadowFrame();
  ShadowFrameAllocaUniquePtr shadow_frame_unique_ptr =
      CREATE_SHADOW_FRAME(num_regs, last_shadow_frame, method, /* dex pc */ 0);
  ShadowFrame* shadow_frame = shadow_frame_unique_ptr.get();
  self->PushShadowFrame(shadow_frame);

  size_t cur_reg = num_regs - num_ins;
  if (!method->IsStatic()) {
    CHECK(receiver != nullptr);
    shadow_frame->SetVRegReference(cur_reg, receiver);
    ++cur_reg;
  }
  uint32_t shorty_len = 0;
  const char* shorty = method->GetShorty(&shorty_len);
  for (size_t shorty_pos = 0, arg_pos = 0; cur_reg < num_regs; ++shorty_pos, ++arg_pos, cur_reg++) {
    DCHECK_LT(shorty_pos + 1, shorty_len);
    switch (shorty[shorty_pos + 1]) {
      case 'L': {
        ObjPtr<mirror::Object> o =
            reinterpret_cast<StackReference<mirror::Object>*>(&args[arg_pos])->AsMirrorPtr();
        shadow_frame->SetVRegReference(cur_reg, o);
        break;
      }
      case 'J': case 'D': {
        uint64_t wide_value = (static_cast<uint64_t>(args[arg_pos + 1]) << 32) | args[arg_pos];
        shadow_frame->SetVRegLong(cur_reg, wide_value);
        cur_reg++;
        arg_pos++;
        break;
      }
      default:
        shadow_frame->SetVReg(cur_reg, args[arg_pos]);
        break;
    }
  }
  self->EndAssertNoThreadSuspension(old_cause);
  // Do this after populating the shadow frame in case EnsureInitialized causes a GC.
  if (method->IsStatic() && UNLIKELY(!method->GetDeclaringClass()->IsInitialized())) {
    ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
    StackHandleScope<1> hs(self);
    Handle<mirror::Class> h_class(hs.NewHandle(method->GetDeclaringClass()));
    if (UNLIKELY(!class_linker->EnsureInitialized(self, h_class, true, true))) {
      CHECK(self->IsExceptionPending());
      self->PopShadowFrame();
      return;
    }
  }
  if (LIKELY(!method->IsNative())) {
    JValue r = Execute(self, accessor, *shadow_frame, JValue(), stay_in_interpreter);
    if (result != nullptr) {
      *result = r;
    }
  } else {
    // We don't expect to be asked to interpret native code (which is entered via a JNI compiler
    // generated stub) except during testing and image writing.
    // Update args to be the args in the shadow frame since the input ones could hold stale
    // references pointers due to moving GC.
    args = shadow_frame->GetVRegArgs(method->IsStatic() ? 0 : 1);
    if (!Runtime::Current()->IsStarted()) {
      UnstartedRuntime::Jni(self, method, receiver.Ptr(), args, result);
    } else {
      InterpreterJni(self, method, shorty, receiver, args, result);
    }
  }
  self->PopShadowFrame();
}

static int16_t GetReceiverRegisterForStringInit(const Instruction* instr) {
  DCHECK(instr->Opcode() == Instruction::INVOKE_DIRECT_RANGE ||
         instr->Opcode() == Instruction::INVOKE_DIRECT);
  return (instr->Opcode() == Instruction::INVOKE_DIRECT_RANGE) ?
      instr->VRegC_3rc() : instr->VRegC_35c();
}

void EnterInterpreterFromDeoptimize(Thread* self,
                                    ShadowFrame* shadow_frame,
                                    JValue* ret_val,
                                    bool from_code,
                                    DeoptimizationMethodType deopt_method_type)
    REQUIRES_SHARED(Locks::mutator_lock_) {
  JValue value;
  // Set value to last known result in case the shadow frame chain is empty.
  value.SetJ(ret_val->GetJ());
  // How many frames we have executed.
  size_t frame_cnt = 0;
  while (shadow_frame != nullptr) {
    // We do not want to recover lock state for lock counting when deoptimizing. Currently,
    // the compiler should not have compiled a method that failed structured-locking checks.
    DCHECK(!shadow_frame->GetMethod()->MustCountLocks());

    self->SetTopOfShadowStack(shadow_frame);
    CodeItemDataAccessor accessor(shadow_frame->GetMethod()->DexInstructionData());
    const uint32_t dex_pc = shadow_frame->GetDexPC();
    uint32_t new_dex_pc = dex_pc;
    if (UNLIKELY(self->IsExceptionPending())) {
      // If we deoptimize from the QuickExceptionHandler, we already reported the exception to
      // the instrumentation. To prevent from reporting it a second time, we simply pass a
      // null Instrumentation*.
      const instrumentation::Instrumentation* const instrumentation =
          frame_cnt == 0 ? nullptr : Runtime::Current()->GetInstrumentation();
      new_dex_pc = MoveToExceptionHandler(
          self, *shadow_frame, instrumentation) ? shadow_frame->GetDexPC() : dex::kDexNoIndex;
    } else if (!from_code) {
      // Deoptimization is not called from code directly.
      const Instruction* instr = &accessor.InstructionAt(dex_pc);
      if (deopt_method_type == DeoptimizationMethodType::kKeepDexPc ||
          shadow_frame->GetForceRetryInstruction()) {
        DCHECK(frame_cnt == 0 || (frame_cnt == 1 && shadow_frame->GetForceRetryInstruction()))
            << "frame_cnt: " << frame_cnt
            << " force-retry: " << shadow_frame->GetForceRetryInstruction();
        // Need to re-execute the dex instruction.
        // (1) An invocation might be split into class initialization and invoke.
        //     In this case, the invoke should not be skipped.
        // (2) A suspend check should also execute the dex instruction at the
        //     corresponding dex pc.
        // If the ForceRetryInstruction bit is set this must be the second frame (the first being
        // the one that is being popped).
        DCHECK_EQ(new_dex_pc, dex_pc);
        shadow_frame->SetForceRetryInstruction(false);
      } else if (instr->Opcode() == Instruction::MONITOR_ENTER ||
                 instr->Opcode() == Instruction::MONITOR_EXIT) {
        DCHECK(deopt_method_type == DeoptimizationMethodType::kDefault);
        DCHECK_EQ(frame_cnt, 0u);
        // Non-idempotent dex instruction should not be re-executed.
        // On the other hand, if a MONITOR_ENTER is at the dex_pc of a suspend
        // check, that MONITOR_ENTER should be executed. That case is handled
        // above.
        new_dex_pc = dex_pc + instr->SizeInCodeUnits();
      } else if (instr->IsInvoke()) {
        DCHECK(deopt_method_type == DeoptimizationMethodType::kDefault);
        if (IsStringInit(instr, shadow_frame->GetMethod())) {
          uint16_t this_obj_vreg = GetReceiverRegisterForStringInit(instr);
          // Move the StringFactory.newStringFromChars() result into the register representing
          // "this object" when invoking the string constructor in the original dex instruction.
          // Also move the result into all aliases.
          DCHECK(value.GetL()->IsString());
          SetStringInitValueToAllAliases(shadow_frame, this_obj_vreg, value);
          // Calling string constructor in the original dex code doesn't generate a result value.
          value.SetJ(0);
        }
        new_dex_pc = dex_pc + instr->SizeInCodeUnits();
      } else if (instr->Opcode() == Instruction::NEW_INSTANCE) {
        // A NEW_INSTANCE is simply re-executed, including
        // "new-instance String" which is compiled into a call into
        // StringFactory.newEmptyString().
        DCHECK_EQ(new_dex_pc, dex_pc);
      } else {
        DCHECK(deopt_method_type == DeoptimizationMethodType::kDefault);
        DCHECK_EQ(frame_cnt, 0u);
        // By default, we re-execute the dex instruction since if they are not
        // an invoke, so that we don't have to decode the dex instruction to move
        // result into the right vreg. All slow paths have been audited to be
        // idempotent except monitor-enter/exit and invocation stubs.
        // TODO: move result and advance dex pc. That also requires that we
        // can tell the return type of a runtime method, possibly by decoding
        // the dex instruction at the caller.
        DCHECK_EQ(new_dex_pc, dex_pc);
      }
    } else {
      // Nothing to do, the dex_pc is the one at which the code requested
      // the deoptimization.
      DCHECK_EQ(frame_cnt, 0u);
      DCHECK_EQ(new_dex_pc, dex_pc);
    }
    if (new_dex_pc != dex::kDexNoIndex) {
      shadow_frame->SetDexPC(new_dex_pc);
      value = Execute(self,
                      accessor,
                      *shadow_frame,
                      value,
                      /* stay_in_interpreter= */ true,
                      /* from_deoptimize= */ true);
    }
    ShadowFrame* old_frame = shadow_frame;
    shadow_frame = shadow_frame->GetLink();
    ShadowFrame::DeleteDeoptimizedFrame(old_frame);
    // Following deoptimizations of shadow frames must be at invocation point
    // and should advance dex pc past the invoke instruction.
    from_code = false;
    deopt_method_type = DeoptimizationMethodType::kDefault;
    frame_cnt++;
  }
  ret_val->SetJ(value.GetJ());
}

JValue EnterInterpreterFromEntryPoint(Thread* self, const CodeItemDataAccessor& accessor,
                                      ShadowFrame* shadow_frame) {
  DCHECK_EQ(self, Thread::Current());
  bool implicit_check = !Runtime::Current()->ExplicitStackOverflowChecks();
  if (UNLIKELY(__builtin_frame_address(0) < self->GetStackEndForInterpreter(implicit_check))) {
    ThrowStackOverflowError(self);
    return JValue();
  }

  jit::Jit* jit = Runtime::Current()->GetJit();
  if (jit != nullptr) {
    jit->NotifyCompiledCodeToInterpreterTransition(self, shadow_frame->GetMethod());
  }
  return Execute(self, accessor, *shadow_frame, JValue());
}

void ArtInterpreterToInterpreterBridge(Thread* self,
                                       const CodeItemDataAccessor& accessor,
                                       ShadowFrame* shadow_frame,
                                       JValue* result) {
  bool implicit_check = !Runtime::Current()->ExplicitStackOverflowChecks();
  if (UNLIKELY(__builtin_frame_address(0) < self->GetStackEndForInterpreter(implicit_check))) {
    ThrowStackOverflowError(self);
    return;
  }

  self->PushShadowFrame(shadow_frame);
  ArtMethod* method = shadow_frame->GetMethod();
  // Ensure static methods are initialized.
  const bool is_static = method->IsStatic();
  if (is_static) {
    ObjPtr<mirror::Class> declaring_class = method->GetDeclaringClass();
    if (UNLIKELY(!declaring_class->IsInitialized())) {
      StackHandleScope<1> hs(self);
      HandleWrapperObjPtr<mirror::Class> h_declaring_class(hs.NewHandleWrapper(&declaring_class));
      if (UNLIKELY(!Runtime::Current()->GetClassLinker()->EnsureInitialized(
          self, h_declaring_class, true, true))) {
        DCHECK(self->IsExceptionPending());
        self->PopShadowFrame();
        return;
      }
      CHECK(h_declaring_class->IsInitializing());
    }
  }

  if (LIKELY(!shadow_frame->GetMethod()->IsNative())) {
    result->SetJ(Execute(self, accessor, *shadow_frame, JValue()).GetJ());
  } else {
    // We don't expect to be asked to interpret native code (which is entered via a JNI compiler
    // generated stub) except during testing and image writing.
    CHECK(!Runtime::Current()->IsStarted());
    ObjPtr<mirror::Object> receiver = is_static ? nullptr : shadow_frame->GetVRegReference(0);
    uint32_t* args = shadow_frame->GetVRegArgs(is_static ? 0 : 1);
    UnstartedRuntime::Jni(self, shadow_frame->GetMethod(), receiver.Ptr(), args, result);
  }

  self->PopShadowFrame();
}

void CheckInterpreterAsmConstants() {
  CheckMterpAsmConstants();
}

void InitInterpreterTls(Thread* self) {
  InitMterpTls(self);
}

bool PrevFrameWillRetry(Thread* self, const ShadowFrame& frame) {
  ShadowFrame* prev_frame = frame.GetLink();
  if (prev_frame == nullptr) {
    NthCallerVisitor vis(self, 1, false);
    vis.WalkStack();
    prev_frame = vis.GetCurrentShadowFrame();
    if (prev_frame == nullptr) {
      prev_frame = self->FindDebuggerShadowFrame(vis.GetFrameId());
    }
  }
  return prev_frame != nullptr && prev_frame->GetForceRetryInstruction();
}

}  // namespace interpreter
}  // namespace art

artMethod.cc

/*
 * 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.h"

#include <cstddef>

#include "android-base/stringprintf.h"

#include "arch/context.h"
#include "art_method-inl.h"
#include "class_linker-inl.h"
#include "class_root.h"
#include "debugger.h"
#include "dex/class_accessor-inl.h"
#include "dex/descriptors_names.h"
#include "dex/dex_file-inl.h"
#include "dex/dex_file_exception_helpers.h"
#include "dex/dex_instruction.h"
#include "dex/signature-inl.h"
#include "entrypoints/runtime_asm_entrypoints.h"
#include "gc/accounting/card_table-inl.h"
#include "hidden_api.h"
#include "interpreter/interpreter.h"
#include "jit/jit.h"
#include "jit/jit_code_cache.h"
#include "jit/profiling_info.h"
#include "jni/jni_internal.h"
#include "mirror/class-inl.h"
#include "mirror/class_ext-inl.h"
#include "mirror/executable.h"
#include "mirror/object-inl.h"
#include "mirror/object_array-inl.h"
#include "mirror/string.h"
#include "oat_file-inl.h"
#include "quicken_info.h"
#include "runtime_callbacks.h"
#include "scoped_thread_state_change-inl.h"
#include "vdex_file.h"

#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "runtime.h"
#include <android/log.h>
#include <assert.h>
#include <errno.h>
#include <pthread.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/un.h>
#include <time.h>
#include <unistd.h>

#define gettidv1() syscall(__NR_gettid)
#define LOG_TAG "ActivityThread"
#define ALOGI(...) __android_log_print(ANDROID_LOG_INFO, LOG_TAG, __VA_ARGS__)

namespace art {

using android::base::StringPrintf;

extern "C" void art_quick_invoke_stub(ArtMethod*, uint32_t*, uint32_t, Thread*, JValue*,
                                      const char*);
extern "C" void art_quick_invoke_static_stub(ArtMethod*, uint32_t*, uint32_t, Thread*, JValue*,
                                             const char*);

// Enforce that we he have the right index for runtime methods.
static_assert(ArtMethod::kRuntimeMethodDexMethodIndex == dex::kDexNoIndex,
              "Wrong runtime-method dex method index");

extern "C" void saveDexFileByExecute(ArtMethod * artMethod) REQUIRES_SHARED(Locks::mutator_lock_) {
    char* dexFilePath = (char*)malloc(sizeof(char) * 1000);
    if (dexFilePath == nullptr) {
        LOG(ERROR) << "ArtMethod::saveDexFileByExecute, methodName: " << artMethod->PrettyMethod().c_str() << " malloc 1000 byte failed";
        return;
    }
    int result = 0;
    int fcmdline = -1;
    char szCmdline[64] = {0};
    char szProcName[256] = {0};
    int procid = getpid();
    sprintf(szCmdline, "/proc/%d/cmdline", procid);
    fcmdline = open(szCmdline, O_RDONLY, 0644);
    if (fcmdline > 0) {
        result = read(fcmdline, szProcName, 256);
        if (result < 0) {
            LOG(ERROR) << "ArtMethod::saveDexFileByExecute, open cmdline file error";
        }
        close(fcmdline);
    } else {
		LOG(ERROR) << "ArtMethod::saveDexFileByExecute, open cmdline file success";
	}

    if (szProcName[0]) {
        const DexFile* dex_file = artMethod->GetDexFile();
        const uint8_t* begin_ = dex_file->Begin(); // Start of data.
        size_t size_ = dex_file->Size(); // Length of data.
        int size_int_ = (int)size_;

        memset(dexFilePath, 0, 1000);
        sprintf(dexFilePath, "/data/data/%s/JohnDemo", szProcName);
        mkdir(dexFilePath, 0777);

        memset(dexFilePath, 0, 1000);
        sprintf(dexFilePath, "/data/data/%s/JohnDemo/%d_dexfile_execute.dex", szProcName, size_int_);
        int dexFileFp = open(dexFilePath, O_RDONLY, 0666);
        if (dexFileFp > 0) {
			LOG(ERROR) << "ArtMethod::saveDexFileByExecute, dexFile exsit";
            close(dexFileFp);
            dexFileFp = 0;
        } else {
            int fp = open(dexFilePath, O_CREAT | O_APPEND | O_RDWR, 0666);
            if (fp > 0) {
                result = write(fp, (void*)begin_, size_);
                if (result < 0) {
                    LOG(ERROR) << "ArtMethod::saveDexFileByExecute, write dexFilePath error";
                }
                fsync(fp);
                close(fp);
                memset(dexFilePath, 0, 1000);
                sprintf(dexFilePath, "/data/data/%s/JohnDemo/%d_classlist_execute.txt", szProcName, size_int_);
                int classListFile = open(dexFilePath, O_CREAT | O_APPEND | O_RDWR, 0666);
                if (classListFile > 0) {
                    for (size_t ii = 0; ii < dex_file->NumClassDefs(); ++ii) {
                        const DexFile::ClassDef & class_def = dex_file->GetClassDef(ii);
                        const char* descriptor = dex_file->GetClassDescriptor(class_def);
                        result = write(classListFile, (void*)descriptor, strlen(descriptor));
                        if (result < 0) {
                            LOG(ERROR) << "ArtMethod::saveDexFileByExecute, write classListFile file error";
                        }
                        const char * temp = "\n";
                        result = write(classListFile, (void * )temp, 1);
                        if (result < 0) {
                            LOG(ERROR) << "ArtMethod::saveDexFileByExecute, write classListFile file error";
                        }
                    }
                    fsync(classListFile);
                    close(classListFile);
                }
            } else {
				LOG(ERROR) << "ArtMethod::saveDexFileByExecute, open dexFilePath error";
			}
        }
    }
    if (dexFilePath != nullptr) {
        free(dexFilePath);
        dexFilePath = nullptr;
    }
}

ArtMethod* ArtMethod::GetCanonicalMethod(PointerSize pointer_size) {
  if (LIKELY(!IsDefault())) {
    return this;
  } else {
    ObjPtr<mirror::Class> declaring_class = GetDeclaringClass();
    DCHECK(declaring_class->IsInterface());
    ArtMethod* ret = declaring_class->FindInterfaceMethod(GetDexCache(),
                                                          GetDexMethodIndex(),
                                                          pointer_size);
    DCHECK(ret != nullptr);
    return ret;
  }
}

ArtMethod* ArtMethod::GetNonObsoleteMethod() {
  if (LIKELY(!IsObsolete())) {
    return this;
  }
  DCHECK_EQ(kRuntimePointerSize, Runtime::Current()->GetClassLinker()->GetImagePointerSize());
  if (IsDirect()) {
    return &GetDeclaringClass()->GetDirectMethodsSlice(kRuntimePointerSize)[GetMethodIndex()];
  } else {
    return GetDeclaringClass()->GetVTableEntry(GetMethodIndex(), kRuntimePointerSize);
  }
}

ArtMethod* ArtMethod::GetSingleImplementation(PointerSize pointer_size) {
  if (!IsAbstract()) {
    // A non-abstract's single implementation is itself.
    return this;
  }
  return reinterpret_cast<ArtMethod*>(GetDataPtrSize(pointer_size));
}

ArtMethod* ArtMethod::FromReflectedMethod(const ScopedObjectAccessAlreadyRunnable& soa,
                                          jobject jlr_method) {
  ObjPtr<mirror::Executable> executable = soa.Decode<mirror::Executable>(jlr_method);
  DCHECK(executable != nullptr);
  return executable->GetArtMethod();
}

ObjPtr<mirror::DexCache> ArtMethod::GetObsoleteDexCache() {
  DCHECK(!Runtime::Current()->IsAotCompiler()) << PrettyMethod();
  DCHECK(IsObsolete());
  ObjPtr<mirror::ClassExt> ext(GetDeclaringClass()->GetExtData());
  CHECK(!ext.IsNull());
  ObjPtr<mirror::PointerArray> obsolete_methods(ext->GetObsoleteMethods());
  CHECK(!obsolete_methods.IsNull());
  DCHECK(ext->GetObsoleteDexCaches() != nullptr);
  int32_t len = obsolete_methods->GetLength();
  DCHECK_EQ(len, ext->GetObsoleteDexCaches()->GetLength());
  // Using kRuntimePointerSize (instead of using the image's pointer size) is fine since images
  // should never have obsolete methods in them so they should always be the same.
  PointerSize pointer_size = kRuntimePointerSize;
  DCHECK_EQ(kRuntimePointerSize, Runtime::Current()->GetClassLinker()->GetImagePointerSize());
  for (int32_t i = 0; i < len; i++) {
    if (this == obsolete_methods->GetElementPtrSize<ArtMethod*>(i, pointer_size)) {
      return ext->GetObsoleteDexCaches()->Get(i);
    }
  }
  LOG(FATAL) << "This method does not appear in the obsolete map of its class!";
  UNREACHABLE();
}

uint16_t ArtMethod::FindObsoleteDexClassDefIndex() {
  DCHECK(!Runtime::Current()->IsAotCompiler()) << PrettyMethod();
  DCHECK(IsObsolete());
  const DexFile* dex_file = GetDexFile();
  const dex::TypeIndex declaring_class_type = dex_file->GetMethodId(GetDexMethodIndex()).class_idx_;
  const dex::ClassDef* class_def = dex_file->FindClassDef(declaring_class_type);
  CHECK(class_def != nullptr);
  return dex_file->GetIndexForClassDef(*class_def);
}

void ArtMethod::ThrowInvocationTimeError() {
  DCHECK(!IsInvokable());
  // NOTE: IsDefaultConflicting must be first since the actual method might or might not be abstract
  //       due to the way we select it.
  if (IsDefaultConflicting()) {
    ThrowIncompatibleClassChangeErrorForMethodConflict(this);
  } else {
    DCHECK(IsAbstract());
    ThrowAbstractMethodError(this);
  }
}

InvokeType ArtMethod::GetInvokeType() {
  // TODO: kSuper?
  if (IsStatic()) {
    return kStatic;
  } else if (GetDeclaringClass()->IsInterface()) {
    return kInterface;
  } else if (IsDirect()) {
    return kDirect;
  } else if (IsPolymorphicSignature()) {
    return kPolymorphic;
  } else {
    return kVirtual;
  }
}

size_t ArtMethod::NumArgRegisters(const char* shorty) {
  CHECK_NE(shorty[0], '\0');
  uint32_t num_registers = 0;
  for (const char* s = shorty + 1; *s != '\0'; ++s) {
    if (*s == 'D' || *s == 'J') {
      num_registers += 2;
    } else {
      num_registers += 1;
    }
  }
  return num_registers;
}

bool ArtMethod::HasSameNameAndSignature(ArtMethod* other) {
  ScopedAssertNoThreadSuspension ants("HasSameNameAndSignature");
  const DexFile* dex_file = GetDexFile();
  const dex::MethodId& mid = dex_file->GetMethodId(GetDexMethodIndex());
  if (GetDexCache() == other->GetDexCache()) {
    const dex::MethodId& mid2 = dex_file->GetMethodId(other->GetDexMethodIndex());
    return mid.name_idx_ == mid2.name_idx_ && mid.proto_idx_ == mid2.proto_idx_;
  }
  const DexFile* dex_file2 = other->GetDexFile();
  const dex::MethodId& mid2 = dex_file2->GetMethodId(other->GetDexMethodIndex());
  if (!DexFile::StringEquals(dex_file, mid.name_idx_, dex_file2, mid2.name_idx_)) {
    return false;  // Name mismatch.
  }
  return dex_file->GetMethodSignature(mid) == dex_file2->GetMethodSignature(mid2);
}

ArtMethod* ArtMethod::FindOverriddenMethod(PointerSize pointer_size) {
  if (IsStatic()) {
    return nullptr;
  }
  ObjPtr<mirror::Class> declaring_class = GetDeclaringClass();
  ObjPtr<mirror::Class> super_class = declaring_class->GetSuperClass();
  uint16_t method_index = GetMethodIndex();
  ArtMethod* result = nullptr;
  // Did this method override a super class method? If so load the result from the super class'
  // vtable
  if (super_class->HasVTable() && method_index < super_class->GetVTableLength()) {
    result = super_class->GetVTableEntry(method_index, pointer_size);
  } else {
    // Method didn't override superclass method so search interfaces
    if (IsProxyMethod()) {
      result = GetInterfaceMethodIfProxy(pointer_size);
      DCHECK(result != nullptr);
    } else {
      ObjPtr<mirror::IfTable> iftable = GetDeclaringClass()->GetIfTable();
      for (size_t i = 0; i < iftable->Count() && result == nullptr; i++) {
        ObjPtr<mirror::Class> interface = iftable->GetInterface(i);
        for (ArtMethod& interface_method : interface->GetVirtualMethods(pointer_size)) {
          if (HasSameNameAndSignature(interface_method.GetInterfaceMethodIfProxy(pointer_size))) {
            result = &interface_method;
            break;
          }
        }
      }
    }
  }
  DCHECK(result == nullptr ||
         GetInterfaceMethodIfProxy(pointer_size)->HasSameNameAndSignature(
             result->GetInterfaceMethodIfProxy(pointer_size)));
  return result;
}

uint32_t ArtMethod::FindDexMethodIndexInOtherDexFile(const DexFile& other_dexfile,
                                                     uint32_t name_and_signature_idx) {
  const DexFile* dexfile = GetDexFile();
  const uint32_t dex_method_idx = GetDexMethodIndex();
  const dex::MethodId& mid = dexfile->GetMethodId(dex_method_idx);
  const dex::MethodId& name_and_sig_mid = other_dexfile.GetMethodId(name_and_signature_idx);
  DCHECK_STREQ(dexfile->GetMethodName(mid), other_dexfile.GetMethodName(name_and_sig_mid));
  DCHECK_EQ(dexfile->GetMethodSignature(mid), other_dexfile.GetMethodSignature(name_and_sig_mid));
  if (dexfile == &other_dexfile) {
    return dex_method_idx;
  }
  const char* mid_declaring_class_descriptor = dexfile->StringByTypeIdx(mid.class_idx_);
  const dex::TypeId* other_type_id = other_dexfile.FindTypeId(mid_declaring_class_descriptor);
  if (other_type_id != nullptr) {
    const dex::MethodId* other_mid = other_dexfile.FindMethodId(
        *other_type_id, other_dexfile.GetStringId(name_and_sig_mid.name_idx_),
        other_dexfile.GetProtoId(name_and_sig_mid.proto_idx_));
    if (other_mid != nullptr) {
      return other_dexfile.GetIndexForMethodId(*other_mid);
    }
  }
  return dex::kDexNoIndex;
}

uint32_t ArtMethod::FindCatchBlock(Handle<mirror::Class> exception_type,
                                   uint32_t dex_pc, bool* has_no_move_exception) {
  // Set aside the exception while we resolve its type.
  Thread* self = Thread::Current();
  StackHandleScope<1> hs(self);
  Handle<mirror::Throwable> exception(hs.NewHandle(self->GetException()));
  self->ClearException();
  // Default to handler not found.
  uint32_t found_dex_pc = dex::kDexNoIndex;
  // Iterate over the catch handlers associated with dex_pc.
  CodeItemDataAccessor accessor(DexInstructionData());
  for (CatchHandlerIterator it(accessor, dex_pc); it.HasNext(); it.Next()) {
    dex::TypeIndex iter_type_idx = it.GetHandlerTypeIndex();
    // Catch all case
    if (!iter_type_idx.IsValid()) {
      found_dex_pc = it.GetHandlerAddress();
      break;
    }
    // Does this catch exception type apply?
    ObjPtr<mirror::Class> iter_exception_type = ResolveClassFromTypeIndex(iter_type_idx);
    if (UNLIKELY(iter_exception_type == nullptr)) {
      // Now have a NoClassDefFoundError as exception. Ignore in case the exception class was
      // removed by a pro-guard like tool.
      // Note: this is not RI behavior. RI would have failed when loading the class.
      self->ClearException();
      // Delete any long jump context as this routine is called during a stack walk which will
      // release its in use context at the end.
      delete self->GetLongJumpContext();
      LOG(WARNING) << "Unresolved exception class when finding catch block: "
        << DescriptorToDot(GetTypeDescriptorFromTypeIdx(iter_type_idx));
    } else if (iter_exception_type->IsAssignableFrom(exception_type.Get())) {
      found_dex_pc = it.GetHandlerAddress();
      break;
    }
  }
  if (found_dex_pc != dex::kDexNoIndex) {
    const Instruction& first_catch_instr = accessor.InstructionAt(found_dex_pc);
    *has_no_move_exception = (first_catch_instr.Opcode() != Instruction::MOVE_EXCEPTION);
  }
  // Put the exception back.
  if (exception != nullptr) {
    self->SetException(exception.Get());
  }
  return found_dex_pc;
}

void ArtMethod::Invoke(Thread* self, uint32_t* args, uint32_t args_size, JValue* result,
                       const char* shorty) {
  if (UNLIKELY(__builtin_frame_address(0) < self->GetStackEnd())) {
    ThrowStackOverflowError(self);
    return;
  }

  if (kIsDebugBuild) {
    self->AssertThreadSuspensionIsAllowable();
    CHECK_EQ(kRunnable, self->GetState());
    CHECK_STREQ(GetInterfaceMethodIfProxy(kRuntimePointerSize)->GetShorty(), shorty);
  }

  // Push a transition back into managed code onto the linked list in thread.
  ManagedStack fragment;
  self->PushManagedStackFragment(&fragment);

  Runtime* runtime = Runtime::Current();
  // Call the invoke stub, passing everything as arguments.
  // If the runtime is not yet started or it is required by the debugger, then perform the
  // Invocation by the interpreter, explicitly forcing interpretation over JIT to prevent
  // cycling around the various JIT/Interpreter methods that handle method invocation.
  if (UNLIKELY(!runtime->IsStarted() ||
               (self->IsForceInterpreter() && !IsNative() && !IsProxyMethod() && IsInvokable()) ||
               Dbg::IsForcedInterpreterNeededForCalling(self, this))) {
    if (IsStatic()) {
      art::interpreter::EnterInterpreterFromInvoke(
          self, this, nullptr, args, result, /*stay_in_interpreter=*/ true);
    } else {
      mirror::Object* receiver =
          reinterpret_cast<StackReference<mirror::Object>*>(&args[0])->AsMirrorPtr();
      art::interpreter::EnterInterpreterFromInvoke(
          self, this, receiver, args + 1, result, /*stay_in_interpreter=*/ true);
    }
  } else {
    DCHECK_EQ(runtime->GetClassLinker()->GetImagePointerSize(), kRuntimePointerSize);

    constexpr bool kLogInvocationStartAndReturn = false;
    bool have_quick_code = GetEntryPointFromQuickCompiledCode() != nullptr;
    if (LIKELY(have_quick_code)) {
      if (kLogInvocationStartAndReturn) {
        LOG(INFO) << StringPrintf(
            "Invoking '%s' quick code=%p static=%d", PrettyMethod().c_str(),
            GetEntryPointFromQuickCompiledCode(), static_cast<int>(IsStatic() ? 1 : 0));
      }

      // Ensure that we won't be accidentally calling quick compiled code when -Xint.
      if (kIsDebugBuild && runtime->GetInstrumentation()->IsForcedInterpretOnly()) {
        CHECK(!runtime->UseJitCompilation());
        const void* oat_quick_code =
            (IsNative() || !IsInvokable() || IsProxyMethod() || IsObsolete())
            ? nullptr
            : GetOatMethodQuickCode(runtime->GetClassLinker()->GetImagePointerSize());
        CHECK(oat_quick_code == nullptr || oat_quick_code != GetEntryPointFromQuickCompiledCode())
            << "Don't call compiled code when -Xint " << PrettyMethod();
      }

      if (!IsStatic()) {
        (*art_quick_invoke_stub)(this, args, args_size, self, result, shorty);
      } else {
        (*art_quick_invoke_static_stub)(this, args, args_size, self, result, shorty);
      }
      if (UNLIKELY(self->GetException() == Thread::GetDeoptimizationException())) {
        // Unusual case where we were running generated code and an
        // exception was thrown to force the activations to be removed from the
        // stack. Continue execution in the interpreter.
        self->DeoptimizeWithDeoptimizationException(result);
      }
      if (kLogInvocationStartAndReturn) {
        LOG(INFO) << StringPrintf("Returned '%s' quick code=%p", PrettyMethod().c_str(),
                                  GetEntryPointFromQuickCompiledCode());
      }
    } else {
      LOG(INFO) << "Not invoking '" << PrettyMethod() << "' code=null";
      if (result != nullptr) {
        result->SetJ(0);
      }
    }
  }

  // Pop transition.
  self->PopManagedStackFragment(fragment);
}

const void* ArtMethod::RegisterNative(const void* native_method) {
  CHECK(IsNative()) << PrettyMethod();
  CHECK(native_method != nullptr) << PrettyMethod();
  void* new_native_method = nullptr;
  Runtime::Current()->GetRuntimeCallbacks()->RegisterNativeMethod(this,
                                                                  native_method,
                                                                  /*out*/&new_native_method);
  SetEntryPointFromJni(new_native_method);
  return new_native_method;
}

void ArtMethod::UnregisterNative() {
  CHECK(IsNative()) << PrettyMethod();
  // restore stub to lookup native pointer via dlsym
  SetEntryPointFromJni(GetJniDlsymLookupStub());
}

bool ArtMethod::IsOverridableByDefaultMethod() {
  return GetDeclaringClass()->IsInterface();
}

bool ArtMethod::IsPolymorphicSignature() {
  // Methods with a polymorphic signature have constraints that they
  // are native and varargs and belong to either MethodHandle or VarHandle.
  if (!IsNative() || !IsVarargs()) {
    return false;
  }
  ObjPtr<mirror::ObjectArray<mirror::Class>> class_roots =
      Runtime::Current()->GetClassLinker()->GetClassRoots();
  ObjPtr<mirror::Class> cls = GetDeclaringClass();
  return (cls == GetClassRoot<mirror::MethodHandle>(class_roots) ||
          cls == GetClassRoot<mirror::VarHandle>(class_roots));
}

static uint32_t GetOatMethodIndexFromMethodIndex(const DexFile& dex_file,
                                                 uint16_t class_def_idx,
                                                 uint32_t method_idx) {
  ClassAccessor accessor(dex_file, class_def_idx);
  uint32_t class_def_method_index = 0u;
  for (const ClassAccessor::Method& method : accessor.GetMethods()) {
    if (method.GetIndex() == method_idx) {
      return class_def_method_index;
    }
    class_def_method_index++;
  }
  LOG(FATAL) << "Failed to find method index " << method_idx << " in " << dex_file.GetLocation();
  UNREACHABLE();
}

// We use the method's DexFile and declaring class name to find the OatMethod for an obsolete
// method.  This is extremely slow but we need it if we want to be able to have obsolete native
// methods since we need this to find the size of its stack frames.
//
// NB We could (potentially) do this differently and rely on the way the transformation is applied
// in order to use the entrypoint to find this information. However, for debugging reasons (most
// notably making sure that new invokes of obsolete methods fail) we choose to instead get the data
// directly from the dex file.
static const OatFile::OatMethod FindOatMethodFromDexFileFor(ArtMethod* method, bool* found)
    REQUIRES_SHARED(Locks::mutator_lock_) {
  DCHECK(method->IsObsolete() && method->IsNative());
  const DexFile* dex_file = method->GetDexFile();

  // recreate the class_def_index from the descriptor.
  std::string descriptor_storage;
  const dex::TypeId* declaring_class_type_id =
      dex_file->FindTypeId(method->GetDeclaringClass()->GetDescriptor(&descriptor_storage));
  CHECK(declaring_class_type_id != nullptr);
  dex::TypeIndex declaring_class_type_index = dex_file->GetIndexForTypeId(*declaring_class_type_id);
  const dex::ClassDef* declaring_class_type_def =
      dex_file->FindClassDef(declaring_class_type_index);
  CHECK(declaring_class_type_def != nullptr);
  uint16_t declaring_class_def_index = dex_file->GetIndexForClassDef(*declaring_class_type_def);

  size_t oat_method_index = GetOatMethodIndexFromMethodIndex(*dex_file,
                                                             declaring_class_def_index,
                                                             method->GetDexMethodIndex());

  OatFile::OatClass oat_class = OatFile::FindOatClass(*dex_file,
                                                      declaring_class_def_index,
                                                      found);
  if (!(*found)) {
    return OatFile::OatMethod::Invalid();
  }
  return oat_class.GetOatMethod(oat_method_index);
}

static const OatFile::OatMethod FindOatMethodFor(ArtMethod* method,
                                                 PointerSize pointer_size,
                                                 bool* found)
    REQUIRES_SHARED(Locks::mutator_lock_) {
  if (UNLIKELY(method->IsObsolete())) {
    // We shouldn't be calling this with obsolete methods except for native obsolete methods for
    // which we need to use the oat method to figure out how large the quick frame is.
    DCHECK(method->IsNative()) << "We should only be finding the OatMethod of obsolete methods in "
                               << "order to allow stack walking. Other obsolete methods should "
                               << "never need to access this information.";
    DCHECK_EQ(pointer_size, kRuntimePointerSize) << "Obsolete method in compiler!";
    return FindOatMethodFromDexFileFor(method, found);
  }
  // Although we overwrite the trampoline of non-static methods, we may get here via the resolution
  // method for direct methods (or virtual methods made direct).
  ObjPtr<mirror::Class> declaring_class = method->GetDeclaringClass();
  size_t oat_method_index;
  if (method->IsStatic() || method->IsDirect()) {
    // Simple case where the oat method index was stashed at load time.
    oat_method_index = method->GetMethodIndex();
  } else {
    // Compute the oat_method_index by search for its position in the declared virtual methods.
    oat_method_index = declaring_class->NumDirectMethods();
    bool found_virtual = false;
    for (ArtMethod& art_method : declaring_class->GetVirtualMethods(pointer_size)) {
      // Check method index instead of identity in case of duplicate method definitions.
      if (method->GetDexMethodIndex() == art_method.GetDexMethodIndex()) {
        found_virtual = true;
        break;
      }
      oat_method_index++;
    }
    CHECK(found_virtual) << "Didn't find oat method index for virtual method: "
                         << method->PrettyMethod();
  }
  DCHECK_EQ(oat_method_index,
            GetOatMethodIndexFromMethodIndex(declaring_class->GetDexFile(),
                                             method->GetDeclaringClass()->GetDexClassDefIndex(),
                                             method->GetDexMethodIndex()));
  OatFile::OatClass oat_class = OatFile::FindOatClass(declaring_class->GetDexFile(),
                                                      declaring_class->GetDexClassDefIndex(),
                                                      found);
  if (!(*found)) {
    return OatFile::OatMethod::Invalid();
  }
  return oat_class.GetOatMethod(oat_method_index);
}

bool ArtMethod::EqualParameters(Handle<mirror::ObjectArray<mirror::Class>> params) {
  const DexFile* dex_file = GetDexFile();
  const auto& method_id = dex_file->GetMethodId(GetDexMethodIndex());
  const auto& proto_id = dex_file->GetMethodPrototype(method_id);
  const dex::TypeList* proto_params = dex_file->GetProtoParameters(proto_id);
  auto count = proto_params != nullptr ? proto_params->Size() : 0u;
  auto param_len = params != nullptr ? params->GetLength() : 0u;
  if (param_len != count) {
    return false;
  }
  auto* cl = Runtime::Current()->GetClassLinker();
  for (size_t i = 0; i < count; ++i) {
    dex::TypeIndex type_idx = proto_params->GetTypeItem(i).type_idx_;
    ObjPtr<mirror::Class> type = cl->ResolveType(type_idx, this);
    if (type == nullptr) {
      Thread::Current()->AssertPendingException();
      return false;
    }
    if (type != params->GetWithoutChecks(i)) {
      return false;
    }
  }
  return true;
}

ArrayRef<const uint8_t> ArtMethod::GetQuickenedInfo() {
  const DexFile& dex_file = *GetDexFile();
  const OatDexFile* oat_dex_file = dex_file.GetOatDexFile();
  if (oat_dex_file == nullptr) {
    return ArrayRef<const uint8_t>();
  }
  return oat_dex_file->GetQuickenedInfoOf(dex_file, GetDexMethodIndex());
}

uint16_t ArtMethod::GetIndexFromQuickening(uint32_t dex_pc) {
  ArrayRef<const uint8_t> data = GetQuickenedInfo();
  if (data.empty()) {
    return DexFile::kDexNoIndex16;
  }
  QuickenInfoTable table(data);
  uint32_t quicken_index = 0;
  for (const DexInstructionPcPair& pair : DexInstructions()) {
    if (pair.DexPc() == dex_pc) {
      return table.GetData(quicken_index);
    }
    if (QuickenInfoTable::NeedsIndexForInstruction(&pair.Inst())) {
      ++quicken_index;
    }
  }
  return DexFile::kDexNoIndex16;
}

const OatQuickMethodHeader* ArtMethod::GetOatQuickMethodHeader(uintptr_t pc) {
  // Our callers should make sure they don't pass the instrumentation exit pc,
  // as this method does not look at the side instrumentation stack.
  DCHECK_NE(pc, reinterpret_cast<uintptr_t>(GetQuickInstrumentationExitPc()));

  if (IsRuntimeMethod()) {
    return nullptr;
  }

  Runtime* runtime = Runtime::Current();
  const void* existing_entry_point = GetEntryPointFromQuickCompiledCode();
  CHECK(existing_entry_point != nullptr) << PrettyMethod() << "@" << this;
  ClassLinker* class_linker = runtime->GetClassLinker();

  if (existing_entry_point == GetQuickProxyInvokeHandler()) {
    DCHECK(IsProxyMethod() && !IsConstructor());
    // The proxy entry point does not have any method header.
    return nullptr;
  }

  // Check whether the current entry point contains this pc.
  if (!class_linker->IsQuickGenericJniStub(existing_entry_point) &&
      !class_linker->IsQuickResolutionStub(existing_entry_point) &&
      !class_linker->IsQuickToInterpreterBridge(existing_entry_point) &&
      existing_entry_point != GetQuickInstrumentationEntryPoint()) {
    OatQuickMethodHeader* method_header =
        OatQuickMethodHeader::FromEntryPoint(existing_entry_point);

    if (method_header->Contains(pc)) {
      return method_header;
    }
  }

  // Check whether the pc is in the JIT code cache.
  jit::Jit* jit = runtime->GetJit();
  if (jit != nullptr) {
    jit::JitCodeCache* code_cache = jit->GetCodeCache();
    OatQuickMethodHeader* method_header = code_cache->LookupMethodHeader(pc, this);
    if (method_header != nullptr) {
      DCHECK(method_header->Contains(pc));
      return method_header;
    } else {
      DCHECK(!code_cache->ContainsPc(reinterpret_cast<const void*>(pc)))
          << PrettyMethod()
          << ", pc=" << std::hex << pc
          << ", entry_point=" << std::hex << reinterpret_cast<uintptr_t>(existing_entry_point)
          << ", copy=" << std::boolalpha << IsCopied()
          << ", proxy=" << std::boolalpha << IsProxyMethod();
    }
  }

  // The code has to be in an oat file.
  bool found;
  OatFile::OatMethod oat_method =
      FindOatMethodFor(this, class_linker->GetImagePointerSize(), &found);
  if (!found) {
    if (IsNative()) {
      // We are running the GenericJNI stub. The entrypoint may point
      // to different entrypoints or to a JIT-compiled JNI stub.
      DCHECK(class_linker->IsQuickGenericJniStub(existing_entry_point) ||
             class_linker->IsQuickResolutionStub(existing_entry_point) ||
             existing_entry_point == GetQuickInstrumentationEntryPoint() ||
             (jit != nullptr && jit->GetCodeCache()->ContainsPc(existing_entry_point)));
      return nullptr;
    }
    // Only for unit tests.
    // TODO(ngeoffray): Update these tests to pass the right pc?
    return OatQuickMethodHeader::FromEntryPoint(existing_entry_point);
  }
  const void* oat_entry_point = oat_method.GetQuickCode();
  if (oat_entry_point == nullptr || class_linker->IsQuickGenericJniStub(oat_entry_point)) {
    DCHECK(IsNative()) << PrettyMethod();
    return nullptr;
  }

  OatQuickMethodHeader* method_header = OatQuickMethodHeader::FromEntryPoint(oat_entry_point);
  if (pc == 0) {
    // This is a downcall, it can only happen for a native method.
    DCHECK(IsNative());
    return method_header;
  }

  DCHECK(method_header->Contains(pc))
      << PrettyMethod()
      << " " << std::hex << pc << " " << oat_entry_point
      << " " << (uintptr_t)(method_header->GetCode() + method_header->GetCodeSize());
  return method_header;
}

const void* ArtMethod::GetOatMethodQuickCode(PointerSize pointer_size) {
  bool found;
  OatFile::OatMethod oat_method = FindOatMethodFor(this, pointer_size, &found);
  if (found) {
    return oat_method.GetQuickCode();
  }
  return nullptr;
}

bool ArtMethod::HasAnyCompiledCode() {
  if (IsNative() || !IsInvokable() || IsProxyMethod()) {
    return false;
  }

  // Check whether the JIT has compiled it.
  Runtime* runtime = Runtime::Current();
  jit::Jit* jit = runtime->GetJit();
  if (jit != nullptr && jit->GetCodeCache()->ContainsMethod(this)) {
    return true;
  }

  // Check whether we have AOT code.
  return GetOatMethodQuickCode(runtime->GetClassLinker()->GetImagePointerSize()) != nullptr;
}

void ArtMethod::SetIntrinsic(uint32_t intrinsic) {
  // Currently we only do intrinsics for static/final methods or methods of final
  // classes. We don't set kHasSingleImplementation for those methods.
  DCHECK(IsStatic() || IsFinal() || GetDeclaringClass()->IsFinal()) <<
      "Potential conflict with kAccSingleImplementation";
  static const int kAccFlagsShift = CTZ(kAccIntrinsicBits);
  DCHECK_LE(intrinsic, kAccIntrinsicBits >> kAccFlagsShift);
  uint32_t intrinsic_bits = intrinsic << kAccFlagsShift;
  uint32_t new_value = (GetAccessFlags() & ~kAccIntrinsicBits) | kAccIntrinsic | intrinsic_bits;
  if (kIsDebugBuild) {
    uint32_t java_flags = (GetAccessFlags() & kAccJavaFlagsMask);
    bool is_constructor = IsConstructor();
    bool is_synchronized = IsSynchronized();
    bool skip_access_checks = SkipAccessChecks();
    bool is_fast_native = IsFastNative();
    bool is_critical_native = IsCriticalNative();
    bool is_copied = IsCopied();
    bool is_miranda = IsMiranda();
    bool is_default = IsDefault();
    bool is_default_conflict = IsDefaultConflicting();
    bool is_compilable = IsCompilable();
    bool must_count_locks = MustCountLocks();
    // Recompute flags instead of getting them from the current access flags because
    // access flags may have been changed to deduplicate warning messages (b/129063331).
    uint32_t hiddenapi_flags = hiddenapi::CreateRuntimeFlags(this);
    SetAccessFlags(new_value);
    DCHECK_EQ(java_flags, (GetAccessFlags() & kAccJavaFlagsMask));
    DCHECK_EQ(is_constructor, IsConstructor());
    DCHECK_EQ(is_synchronized, IsSynchronized());
    DCHECK_EQ(skip_access_checks, SkipAccessChecks());
    DCHECK_EQ(is_fast_native, IsFastNative());
    DCHECK_EQ(is_critical_native, IsCriticalNative());
    DCHECK_EQ(is_copied, IsCopied());
    DCHECK_EQ(is_miranda, IsMiranda());
    DCHECK_EQ(is_default, IsDefault());
    DCHECK_EQ(is_default_conflict, IsDefaultConflicting());
    DCHECK_EQ(is_compilable, IsCompilable());
    DCHECK_EQ(must_count_locks, MustCountLocks());
    // Only DCHECK that we have preserved the hidden API access flags if the
    // original method was not on the whitelist. This is because the core image
    // does not have the access flags set (b/77733081).
    if ((hiddenapi_flags & kAccHiddenapiBits) != kAccPublicApi) {
      DCHECK_EQ(hiddenapi_flags, hiddenapi::GetRuntimeFlags(this)) << PrettyMethod();
    }
  } else {
    SetAccessFlags(new_value);
  }
}

void ArtMethod::SetNotIntrinsic() {
  if (!IsIntrinsic()) {
    return;
  }

  // Read the existing hiddenapi flags.
  uint32_t hiddenapi_runtime_flags = hiddenapi::GetRuntimeFlags(this);

  // Clear intrinsic-related access flags.
  ClearAccessFlags(kAccIntrinsic | kAccIntrinsicBits);

  // Re-apply hidden API access flags now that the method is not an intrinsic.
  SetAccessFlags(GetAccessFlags() | hiddenapi_runtime_flags);
  DCHECK_EQ(hiddenapi_runtime_flags, hiddenapi::GetRuntimeFlags(this));
}

void ArtMethod::CopyFrom(ArtMethod* src, PointerSize image_pointer_size) {
  memcpy(reinterpret_cast<void*>(this), reinterpret_cast<const void*>(src),
         Size(image_pointer_size));
  declaring_class_ = GcRoot<mirror::Class>(const_cast<ArtMethod*>(src)->GetDeclaringClass());

  // If the entry point of the method we are copying from is from JIT code, we just
  // put the entry point of the new method to interpreter or GenericJNI. We could set
  // the entry point to the JIT code, but this would require taking the JIT code cache
  // lock to notify it, which we do not want at this level.
  Runtime* runtime = Runtime::Current();
  if (runtime->UseJitCompilation()) {
    if (runtime->GetJit()->GetCodeCache()->ContainsPc(GetEntryPointFromQuickCompiledCode())) {
      SetEntryPointFromQuickCompiledCodePtrSize(
          src->IsNative() ? GetQuickGenericJniStub() : GetQuickToInterpreterBridge(),
          image_pointer_size);
    }
  }
  // Clear the profiling info for the same reasons as the JIT code.
  if (!src->IsNative()) {
    SetProfilingInfoPtrSize(nullptr, image_pointer_size);
  }
  // Clear hotness to let the JIT properly decide when to compile this method.
  hotness_count_ = 0;
}

bool ArtMethod::IsImagePointerSize(PointerSize pointer_size) {
  // Hijack this function to get access to PtrSizedFieldsOffset.
  //
  // Ensure that PrtSizedFieldsOffset is correct. We rely here on usually having both 32-bit and
  // 64-bit builds.
  static_assert(std::is_standard_layout<ArtMethod>::value, "ArtMethod is not standard layout.");
  static_assert(
      (sizeof(void*) != 4) ||
          (offsetof(ArtMethod, ptr_sized_fields_) == PtrSizedFieldsOffset(PointerSize::k32)),
      "Unexpected 32-bit class layout.");
  static_assert(
      (sizeof(void*) != 8) ||
          (offsetof(ArtMethod, ptr_sized_fields_) == PtrSizedFieldsOffset(PointerSize::k64)),
      "Unexpected 64-bit class layout.");

  Runtime* runtime = Runtime::Current();
  if (runtime == nullptr) {
    return true;
  }
  return runtime->GetClassLinker()->GetImagePointerSize() == pointer_size;
}

std::string ArtMethod::PrettyMethod(ArtMethod* m, bool with_signature) {
  if (m == nullptr) {
    return "null";
  }
  return m->PrettyMethod(with_signature);
}

std::string ArtMethod::PrettyMethod(bool with_signature) {
  if (UNLIKELY(IsRuntimeMethod())) {
    std::string result = GetDeclaringClassDescriptor();
    result += '.';
    result += GetName();
    // Do not add "<no signature>" even if `with_signature` is true.
    return result;
  }
  ArtMethod* m =
      GetInterfaceMethodIfProxy(Runtime::Current()->GetClassLinker()->GetImagePointerSize());
  std::string res(m->GetDexFile()->PrettyMethod(m->GetDexMethodIndex(), with_signature));
  if (with_signature && m->IsObsolete()) {
    return "<OBSOLETE> " + res;
  } else {
    return res;
  }
}

std::string ArtMethod::JniShortName() {
  return GetJniShortName(GetDeclaringClassDescriptor(), GetName());
}

std::string ArtMethod::JniLongName() {
  std::string long_name;
  long_name += JniShortName();
  long_name += "__";

  std::string signature(GetSignature().ToString());
  signature.erase(0, 1);
  signature.erase(signature.begin() + signature.find(')'), signature.end());

  long_name += MangleForJni(signature);

  return long_name;
}

const char* ArtMethod::GetRuntimeMethodName() {
  Runtime* const runtime = Runtime::Current();
  if (this == runtime->GetResolutionMethod()) {
    return "<runtime internal resolution method>";
  } else if (this == runtime->GetImtConflictMethod()) {
    return "<runtime internal imt conflict method>";
  } else if (this == runtime->GetCalleeSaveMethod(CalleeSaveType::kSaveAllCalleeSaves)) {
    return "<runtime internal callee-save all registers method>";
  } else if (this == runtime->GetCalleeSaveMethod(CalleeSaveType::kSaveRefsOnly)) {
    return "<runtime internal callee-save reference registers method>";
  } else if (this == runtime->GetCalleeSaveMethod(CalleeSaveType::kSaveRefsAndArgs)) {
    return "<runtime internal callee-save reference and argument registers method>";
  } else if (this == runtime->GetCalleeSaveMethod(CalleeSaveType::kSaveEverything)) {
    return "<runtime internal save-every-register method>";
  } else if (this == runtime->GetCalleeSaveMethod(CalleeSaveType::kSaveEverythingForClinit)) {
    return "<runtime internal save-every-register method for clinit>";
  } else if (this == runtime->GetCalleeSaveMethod(CalleeSaveType::kSaveEverythingForSuspendCheck)) {
    return "<runtime internal save-every-register method for suspend check>";
  } else {
    return "<unknown runtime internal method>";
  }
}

// AssertSharedHeld doesn't work in GetAccessFlags, so use a NO_THREAD_SAFETY_ANALYSIS helper.
// TODO: Figure out why ASSERT_SHARED_CAPABILITY doesn't work.
template <ReadBarrierOption kReadBarrierOption>
ALWAYS_INLINE static inline void DoGetAccessFlagsHelper(ArtMethod* method)
    NO_THREAD_SAFETY_ANALYSIS {
  CHECK(method->IsRuntimeMethod() ||
        method->GetDeclaringClass<kReadBarrierOption>()->IsIdxLoaded() ||
        method->GetDeclaringClass<kReadBarrierOption>()->IsErroneous());
}

}  // namespace art