runtime/mirror/art_method-inl.h

/*
 * 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.
 */

#ifndef ART_RUNTIME_MIRROR_ART_METHOD_INL_H_
#define ART_RUNTIME_MIRROR_ART_METHOD_INL_H_

#include "art_method.h"

#include "class_linker.h"
#include "dex_cache.h"
#include "dex_file.h"
#include "entrypoints/entrypoint_utils.h"
#include "method_helper.h"
#include "object-inl.h"
#include "object_array.h"
#include "oat.h"
#include "quick/quick_method_frame_info.h"
#include "read_barrier-inl.h"
#include "runtime-inl.h"

namespace art {
namespace mirror {

inline uint32_t ArtMethod::ClassSize() {
  uint32_t vtable_entries = Object::kVTableLength + 8;
  return Class::ComputeClassSize(true, vtable_entries, 0, 0, 0);
}

template<ReadBarrierOption kReadBarrierOption>
inline Class* ArtMethod::GetJavaLangReflectArtMethod() {
  DCHECK(java_lang_reflect_ArtMethod_ != nullptr);
  return ReadBarrier::BarrierForRoot<mirror::Class, kReadBarrierOption>(
      &java_lang_reflect_ArtMethod_);
}

inline Class* ArtMethod::GetDeclaringClass() {
  Class* result = GetFieldObject<Class>(OFFSET_OF_OBJECT_MEMBER(ArtMethod, declaring_class_));
  DCHECK(result != NULL) << this;
  DCHECK(result->IsIdxLoaded() || result->IsErroneous()) << this;
  return result;
}

inline void ArtMethod::SetDeclaringClass(Class *new_declaring_class) {
  SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(ArtMethod, declaring_class_),
                        new_declaring_class);
}

inline uint32_t ArtMethod::GetAccessFlags() {
  DCHECK(GetDeclaringClass()->IsIdxLoaded() || GetDeclaringClass()->IsErroneous());
  return GetField32(OFFSET_OF_OBJECT_MEMBER(ArtMethod, access_flags_));
}

inline uint16_t ArtMethod::GetMethodIndex() {
  DCHECK(GetDeclaringClass()->IsResolved() || GetDeclaringClass()->IsErroneous());
  return GetField32(OFFSET_OF_OBJECT_MEMBER(ArtMethod, method_index_));
}

inline uint32_t ArtMethod::GetDexMethodIndex() {
#ifdef ART_SEA_IR_MODE
  // TODO: Re-add this check for (PORTABLE + SMALL + ) SEA IR when PORTABLE IS fixed!
  // DCHECK(GetDeclaringClass()->IsLoaded() || GetDeclaringClass()->IsErroneous());
#else
  DCHECK(GetDeclaringClass()->IsLoaded() || GetDeclaringClass()->IsErroneous());
#endif
  return GetField32(OFFSET_OF_OBJECT_MEMBER(ArtMethod, dex_method_index_));
}

inline ObjectArray<String>* ArtMethod::GetDexCacheStrings() {
  return GetFieldObject<ObjectArray<String>>(
      OFFSET_OF_OBJECT_MEMBER(ArtMethod, dex_cache_strings_));
}

inline ObjectArray<ArtMethod>* ArtMethod::GetDexCacheResolvedMethods() {
  return GetFieldObject<ObjectArray<ArtMethod>>(
      OFFSET_OF_OBJECT_MEMBER(ArtMethod, dex_cache_resolved_methods_));
}

inline ObjectArray<Class>* ArtMethod::GetDexCacheResolvedTypes() {
  return GetFieldObject<ObjectArray<Class>>(
      OFFSET_OF_OBJECT_MEMBER(ArtMethod, dex_cache_resolved_types_));
}

inline uint32_t ArtMethod::GetCodeSize() {
  DCHECK(!IsRuntimeMethod() && !IsProxyMethod()) << PrettyMethod(this);
  const void* code = EntryPointToCodePointer(GetEntryPointFromQuickCompiledCode());
  if (code == nullptr) {
    return 0u;
  }
  return reinterpret_cast<const OatQuickMethodHeader*>(code)[-1].code_size_;
}

inline bool ArtMethod::CheckIncompatibleClassChange(InvokeType type) {
  switch (type) {
    case kStatic:
      return !IsStatic();
    case kDirect:
      return !IsDirect() || IsStatic();
    case kVirtual: {
      Class* methods_class = GetDeclaringClass();
      return IsDirect() || (methods_class->IsInterface() && !IsMiranda());
    }
    case kSuper:
      return false;  // TODO: appropriate checks for call to super class.
    case kInterface: {
      Class* methods_class = GetDeclaringClass();
      return IsDirect() || !(methods_class->IsInterface() || methods_class->IsObjectClass());
    }
    default:
      LOG(FATAL) << "Unreachable - invocation type: " << type;
      return true;
  }
}

inline void ArtMethod::AssertPcIsWithinQuickCode(uintptr_t pc) {
  if (!kIsDebugBuild) {
    return;
  }
  if (IsNative() || IsRuntimeMethod() || IsProxyMethod()) {
    return;
  }
  if (pc == GetQuickInstrumentationExitPc()) {
    return;
  }
  const void* code = GetEntryPointFromQuickCompiledCode();
  if (code == GetQuickToInterpreterBridge() || code == GetQuickInstrumentationEntryPoint()) {
    return;
  }
  ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
  if (code == class_linker->GetQuickResolutionTrampoline() ||
      code == class_linker->GetQuickToInterpreterBridgeTrampoline()) {
    return;
  }
  DCHECK(IsWithinQuickCode(pc))
      << PrettyMethod(this)
      << " pc=" << std::hex << pc
      << " code=" << code
      << " size=" << GetCodeSize();
}

inline uint32_t ArtMethod::GetQuickOatCodeOffset() {
  DCHECK(!Runtime::Current()->IsStarted());
  return PointerToLowMemUInt32(GetEntryPointFromQuickCompiledCode());
}

inline uint32_t ArtMethod::GetPortableOatCodeOffset() {
  DCHECK(!Runtime::Current()->IsStarted());
  return PointerToLowMemUInt32(GetEntryPointFromPortableCompiledCode());
}

inline void ArtMethod::SetQuickOatCodeOffset(uint32_t code_offset) {
  DCHECK(!Runtime::Current()->IsStarted());
  SetEntryPointFromQuickCompiledCode(reinterpret_cast<void*>(code_offset));
}

inline void ArtMethod::SetPortableOatCodeOffset(uint32_t code_offset) {
  DCHECK(!Runtime::Current()->IsStarted());
  SetEntryPointFromPortableCompiledCode(reinterpret_cast<void*>(code_offset));
}

inline const void* ArtMethod::GetQuickOatEntryPoint() {
  if (IsPortableCompiled() || IsAbstract() || IsRuntimeMethod() || IsProxyMethod()) {
    return nullptr;
  }
  Runtime* runtime = Runtime::Current();
  const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(this);
  // On failure, instead of nullptr we get the quick-generic-jni-trampoline for native method
  // indicating the generic JNI, or the quick-to-interpreter-bridge (but not the trampoline)
  // for non-native methods.
  DCHECK(entry_point != runtime->GetClassLinker()->GetQuickToInterpreterBridgeTrampoline());
  if (UNLIKELY(entry_point == GetQuickToInterpreterBridge()) ||
      UNLIKELY(entry_point == runtime->GetClassLinker()->GetQuickGenericJniTrampoline())) {
    return nullptr;
  }
  return entry_point;
}

inline const void* ArtMethod::GetQuickOatCodePointer() {
  return EntryPointToCodePointer(GetQuickOatEntryPoint());
}

inline const uint8_t* ArtMethod::GetMappingTable() {
  const void* code_pointer = GetQuickOatCodePointer();
  if (code_pointer == nullptr) {
    return nullptr;
  }
  return GetMappingTable(code_pointer);
}

inline const uint8_t* ArtMethod::GetMappingTable(const void* code_pointer) {
  DCHECK(code_pointer != nullptr);
  DCHECK(code_pointer == GetQuickOatCodePointer());
  uint32_t offset =
      reinterpret_cast<const OatQuickMethodHeader*>(code_pointer)[-1].mapping_table_offset_;
  if (UNLIKELY(offset == 0u)) {
    return nullptr;
  }
  return reinterpret_cast<const uint8_t*>(code_pointer) - offset;
}

inline const uint8_t* ArtMethod::GetVmapTable() {
  const void* code_pointer = GetQuickOatCodePointer();
  if (code_pointer == nullptr) {
    return nullptr;
  }
  return GetVmapTable(code_pointer);
}

inline const uint8_t* ArtMethod::GetVmapTable(const void* code_pointer) {
  DCHECK(code_pointer != nullptr);
  DCHECK(code_pointer == GetQuickOatCodePointer());
  uint32_t offset =
      reinterpret_cast<const OatQuickMethodHeader*>(code_pointer)[-1].vmap_table_offset_;
  if (UNLIKELY(offset == 0u)) {
    return nullptr;
  }
  return reinterpret_cast<const uint8_t*>(code_pointer) - offset;
}

inline void ArtMethod::SetOatNativeGcMapOffset(uint32_t gc_map_offset) {
  DCHECK(!Runtime::Current()->IsStarted());
  SetNativeGcMap(reinterpret_cast<uint8_t*>(gc_map_offset));
}

inline uint32_t ArtMethod::GetOatNativeGcMapOffset() {
  DCHECK(!Runtime::Current()->IsStarted());
  return PointerToLowMemUInt32(GetNativeGcMap());
}

inline bool ArtMethod::IsRuntimeMethod() {
  return GetDexMethodIndex() == DexFile::kDexNoIndex;
}

inline bool ArtMethod::IsCalleeSaveMethod() {
  if (!IsRuntimeMethod()) {
    return false;
  }
  Runtime* runtime = Runtime::Current();
  bool result = false;
  for (int i = 0; i < Runtime::kLastCalleeSaveType; i++) {
    if (this == runtime->GetCalleeSaveMethod(Runtime::CalleeSaveType(i))) {
      result = true;
      break;
    }
  }
  return result;
}

inline bool ArtMethod::IsResolutionMethod() {
  bool result = this == Runtime::Current()->GetResolutionMethod();
  // Check that if we do think it is phony it looks like the resolution method.
  DCHECK(!result || IsRuntimeMethod());
  return result;
}

inline bool ArtMethod::IsImtConflictMethod() {
  bool result = this == Runtime::Current()->GetImtConflictMethod();
  // Check that if we do think it is phony it looks like the imt conflict method.
  DCHECK(!result || IsRuntimeMethod());
  return result;
}

inline uintptr_t ArtMethod::NativePcOffset(const uintptr_t pc) {
  const void* code = Runtime::Current()->GetInstrumentation()->GetQuickCodeFor(this);
  return pc - reinterpret_cast<uintptr_t>(code);
}

inline uintptr_t ArtMethod::NativePcOffset(const uintptr_t pc, const void* quick_entry_point) {
  DCHECK(quick_entry_point != GetQuickToInterpreterBridge());
  DCHECK(quick_entry_point == Runtime::Current()->GetInstrumentation()->GetQuickCodeFor(this));
  return pc - reinterpret_cast<uintptr_t>(quick_entry_point);
}

template<VerifyObjectFlags kVerifyFlags>
inline void ArtMethod::SetNativeMethod(const void* native_method) {
  SetFieldPtr<false, true, kVerifyFlags>(
      OFFSET_OF_OBJECT_MEMBER(ArtMethod, entry_point_from_jni_), native_method);
}

inline QuickMethodFrameInfo ArtMethod::GetQuickFrameInfo() {
  if (UNLIKELY(IsPortableCompiled())) {
    // Portable compiled dex bytecode or jni stub.
    return QuickMethodFrameInfo(kStackAlignment, 0u, 0u);
  }
  Runtime* runtime = Runtime::Current();
  if (UNLIKELY(IsAbstract()) || UNLIKELY(IsProxyMethod())) {
    return runtime->GetCalleeSaveMethodFrameInfo(Runtime::kRefsAndArgs);
  }
  if (UNLIKELY(IsRuntimeMethod())) {
    return runtime->GetRuntimeMethodFrameInfo(this);
  }

  const void* entry_point = runtime->GetInstrumentation()->GetQuickCodeFor(this);
  // On failure, instead of nullptr we get the quick-generic-jni-trampoline for native method
  // indicating the generic JNI, or the quick-to-interpreter-bridge (but not the trampoline)
  // for non-native methods. And we really shouldn't see a failure for non-native methods here.
  DCHECK(entry_point != runtime->GetClassLinker()->GetQuickToInterpreterBridgeTrampoline());
  CHECK(entry_point != GetQuickToInterpreterBridge());

  if (UNLIKELY(entry_point == runtime->GetClassLinker()->GetQuickGenericJniTrampoline())) {
    // Generic JNI frame.
    DCHECK(IsNative());
    StackHandleScope<1> hs(Thread::Current());
    uint32_t handle_refs =
        MethodHelper(hs.NewHandle(this)).GetNumberOfReferenceArgsWithoutReceiver() + 1;
    size_t scope_size = HandleScope::SizeOf(handle_refs);
    QuickMethodFrameInfo callee_info = runtime->GetCalleeSaveMethodFrameInfo(Runtime::kRefsAndArgs);

    // Callee saves + handle scope + method ref + alignment
    size_t frame_size = RoundUp(callee_info.FrameSizeInBytes() + scope_size
                                - kPointerSize  // callee-save frame stores a whole method pointer
                                + sizeof(StackReference<mirror::ArtMethod>),
                                kStackAlignment);

    return QuickMethodFrameInfo(frame_size, callee_info.CoreSpillMask(), callee_info.FpSpillMask());
  }

  const void* code_pointer = EntryPointToCodePointer(entry_point);
  return GetQuickFrameInfo(code_pointer);
}

inline QuickMethodFrameInfo ArtMethod::GetQuickFrameInfo(const void* code_pointer) {
  DCHECK(code_pointer != nullptr);
  DCHECK_EQ(code_pointer, GetQuickOatCodePointer());
  return reinterpret_cast<const OatQuickMethodHeader*>(code_pointer)[-1].frame_info_;
}

inline const DexFile* ArtMethod::GetDexFile() {
  return GetInterfaceMethodIfProxy()->GetDeclaringClass()->GetDexCache()->GetDexFile();
}

inline const char* ArtMethod::GetDeclaringClassDescriptor() {
  mirror::ArtMethod* method = GetInterfaceMethodIfProxy();
  uint32_t dex_method_idx = method->GetDexMethodIndex();
  if (UNLIKELY(dex_method_idx == DexFile::kDexNoIndex)) {
    return "<runtime method>";
  }
  const DexFile* dex_file = method->GetDexFile();
  return dex_file->GetMethodDeclaringClassDescriptor(dex_file->GetMethodId(dex_method_idx));
}

inline const char* ArtMethod::GetShorty(uint32_t* out_length) {
  mirror::ArtMethod* method = GetInterfaceMethodIfProxy();
  const DexFile* dex_file = method->GetDexFile();
  return dex_file->GetMethodShorty(dex_file->GetMethodId(method->GetDexMethodIndex()), out_length);
}

inline const Signature ArtMethod::GetSignature() {
  mirror::ArtMethod* method = GetInterfaceMethodIfProxy();
  uint32_t dex_method_idx = method->GetDexMethodIndex();
  if (dex_method_idx != DexFile::kDexNoIndex) {
    const DexFile* dex_file = method->GetDexFile();
    return dex_file->GetMethodSignature(dex_file->GetMethodId(dex_method_idx));
  }
  return Signature::NoSignature();
}

inline const char* ArtMethod::GetName() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
  mirror::ArtMethod* method = GetInterfaceMethodIfProxy();
  uint32_t dex_method_idx = method->GetDexMethodIndex();
  if (LIKELY(dex_method_idx != DexFile::kDexNoIndex)) {
    const DexFile* dex_file = method->GetDexFile();
    return dex_file->GetMethodName(dex_file->GetMethodId(dex_method_idx));
  }
  Runtime* runtime = Runtime::Current();
  if (method == runtime->GetResolutionMethod()) {
    return "<runtime internal resolution method>";
  } else if (method == runtime->GetImtConflictMethod()) {
    return "<runtime internal imt conflict method>";
  } else if (method == runtime->GetCalleeSaveMethod(Runtime::kSaveAll)) {
    return "<runtime internal callee-save all registers method>";
  } else if (method == runtime->GetCalleeSaveMethod(Runtime::kRefsOnly)) {
    return "<runtime internal callee-save reference registers method>";
  } else if (method == runtime->GetCalleeSaveMethod(Runtime::kRefsAndArgs)) {
    return "<runtime internal callee-save reference and argument registers method>";
  } else {
    return "<unknown runtime internal method>";
  }
}

inline const DexFile::CodeItem* ArtMethod::GetCodeItem() {
  mirror::ArtMethod* method = GetInterfaceMethodIfProxy();
  return method->GetDexFile()->GetCodeItem(method->GetCodeItemOffset());
}

inline bool ArtMethod::IsResolvedTypeIdx(uint16_t type_idx) {
  mirror::ArtMethod* method = GetInterfaceMethodIfProxy();
  return method->GetDexCacheResolvedTypes()->Get(type_idx) != nullptr;
}

inline int32_t ArtMethod::GetLineNumFromDexPC(uint32_t dex_pc) {
  mirror::ArtMethod* method = GetInterfaceMethodIfProxy();
  if (dex_pc == DexFile::kDexNoIndex) {
    return method->IsNative() ? -2 : -1;
  }
  return method->GetDexFile()->GetLineNumFromPC(method, dex_pc);
}

inline const DexFile::ProtoId& ArtMethod::GetPrototype() {
  mirror::ArtMethod* method = GetInterfaceMethodIfProxy();
  const DexFile* dex_file = method->GetDexFile();
  return dex_file->GetMethodPrototype(dex_file->GetMethodId(method->GetDexMethodIndex()));
}

inline const DexFile::TypeList* ArtMethod::GetParameterTypeList() {
  mirror::ArtMethod* method = GetInterfaceMethodIfProxy();
  const DexFile* dex_file = method->GetDexFile();
  const DexFile::ProtoId& proto = dex_file->GetMethodPrototype(
      dex_file->GetMethodId(method->GetDexMethodIndex()));
  return dex_file->GetProtoParameters(proto);
}

inline const char* ArtMethod::GetDeclaringClassSourceFile() {
  return GetInterfaceMethodIfProxy()->GetDeclaringClass()->GetSourceFile();
}

inline uint16_t ArtMethod::GetClassDefIndex() {
  return GetInterfaceMethodIfProxy()->GetDeclaringClass()->GetDexClassDefIndex();
}

inline const DexFile::ClassDef& ArtMethod::GetClassDef() {
  mirror::ArtMethod* method = GetInterfaceMethodIfProxy();
  return method->GetDexFile()->GetClassDef(GetClassDefIndex());
}

inline const char* ArtMethod::GetReturnTypeDescriptor() {
  mirror::ArtMethod* method = GetInterfaceMethodIfProxy();
  const DexFile* dex_file = method->GetDexFile();
  const DexFile::MethodId& method_id = dex_file->GetMethodId(method->GetDexMethodIndex());
  const DexFile::ProtoId& proto_id = dex_file->GetMethodPrototype(method_id);
  uint16_t return_type_idx = proto_id.return_type_idx_;
  return dex_file->GetTypeDescriptor(dex_file->GetTypeId(return_type_idx));
}

inline const char* ArtMethod::GetTypeDescriptorFromTypeIdx(uint16_t type_idx) {
  mirror::ArtMethod* method = GetInterfaceMethodIfProxy();
  const DexFile* dex_file = method->GetDexFile();
  return dex_file->GetTypeDescriptor(dex_file->GetTypeId(type_idx));
}

inline mirror::ClassLoader* ArtMethod::GetClassLoader() {
  return GetInterfaceMethodIfProxy()->GetDeclaringClass()->GetClassLoader();
}

inline mirror::DexCache* ArtMethod::GetDexCache() {
  return GetInterfaceMethodIfProxy()->GetDeclaringClass()->GetDexCache();
}

inline ArtMethod* ArtMethod::GetInterfaceMethodIfProxy() {
  mirror::Class* klass = GetDeclaringClass();
  if (LIKELY(!klass->IsProxyClass())) {
    return this;
  }
  mirror::ArtMethod* interface_method = GetDexCacheResolvedMethods()->Get(GetDexMethodIndex());
  DCHECK(interface_method != nullptr);
  DCHECK_EQ(interface_method,
            Runtime::Current()->GetClassLinker()->FindMethodForProxy(klass, this));
  return interface_method;
}

}  // namespace mirror
}  // namespace art

#endif  // ART_RUNTIME_MIRROR_ART_METHOD_INL_H_