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/*
* Copyright (C) 2019 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_REFLECTIVE_VALUE_VISITOR_H_
#define ART_RUNTIME_REFLECTIVE_VALUE_VISITOR_H_
#include <android-base/logging.h>
#include <array>
#include <compare>
#include <functional>
#include <stack>
#include "android-base/macros.h"
#include "base/enums.h"
#include "base/globals.h"
#include "base/locks.h"
#include "base/macros.h"
#include "base/value_object.h"
#include "dex/dex_file.h"
#include "jni.h"
#include "mirror/dex_cache.h"
#include "obj_ptr.h"
namespace art {
class ArtField;
class ArtMethod;
class BaseReflectiveHandleScope;
class Thread;
class ReflectionSourceInfo;
class ReflectiveValueVisitor : public ValueObject {
public:
virtual ~ReflectiveValueVisitor() {}
virtual ArtMethod* VisitMethod(ArtMethod* in, const ReflectionSourceInfo& info)
REQUIRES_SHARED(Locks::mutator_lock_) = 0;
virtual ArtField* VisitField(ArtField* in, const ReflectionSourceInfo& info)
REQUIRES_SHARED(Locks::mutator_lock_) = 0;
// Give it an entrypoint through operator() to interact with things that expect lambda-like things
template <typename T,
typename = typename std::enable_if<std::is_same_v<T, ArtField> ||
std::is_same_v<T, ArtMethod>>>
T* operator()(T* t, const ReflectionSourceInfo& info) REQUIRES_SHARED(Locks::mutator_lock_) {
if constexpr (std::is_same_v<T, ArtField>) {
return VisitField(t, info);
} else {
static_assert(std::is_same_v<T, ArtMethod>, "Expected ArtField or ArtMethod");
return VisitMethod(t, info);
}
}
};
template <typename FieldVis, typename MethodVis>
class FunctionReflectiveValueVisitor : public ReflectiveValueVisitor {
public:
FunctionReflectiveValueVisitor(FieldVis fv, MethodVis mv) : fv_(fv), mv_(mv) {}
ArtField* VisitField(ArtField* in, const ReflectionSourceInfo& info) override
REQUIRES(Locks::mutator_lock_) {
return fv_(in, info);
}
ArtMethod* VisitMethod(ArtMethod* in, const ReflectionSourceInfo& info) override
REQUIRES(Locks::mutator_lock_) {
return mv_(in, info);
}
private:
FieldVis fv_;
MethodVis mv_;
};
enum ReflectionSourceType {
kSourceUnknown = 0,
kSourceJavaLangReflectExecutable,
kSourceJavaLangReflectField,
kSourceJavaLangInvokeMethodHandle,
kSourceJavaLangInvokeFieldVarHandle,
kSourceThreadHandleScope,
kSourceJniFieldId,
kSourceJniMethodId,
kSourceDexCacheResolvedMethod,
kSourceDexCacheResolvedField,
kSourceMiscInternal,
};
std::ostream& operator<<(std::ostream& os, ReflectionSourceType type);
class ReflectionSourceInfo : public ValueObject {
public:
virtual ~ReflectionSourceInfo() {}
// Thread id 0 is for non thread roots.
explicit ReflectionSourceInfo(ReflectionSourceType type) : type_(type) {}
virtual void Describe(std::ostream& os) const {
os << "Type=" << type_;
}
ReflectionSourceType GetType() const {
return type_;
}
private:
const ReflectionSourceType type_;
DISALLOW_COPY_AND_ASSIGN(ReflectionSourceInfo);
};
inline std::ostream& operator<<(std::ostream& os, const ReflectionSourceInfo& info) {
info.Describe(os);
return os;
}
class ReflectiveHandleScopeSourceInfo : public ReflectionSourceInfo {
public:
explicit ReflectiveHandleScopeSourceInfo(BaseReflectiveHandleScope* source)
: ReflectionSourceInfo(kSourceThreadHandleScope), source_(source) {}
void Describe(std::ostream& os) const override;
private:
BaseReflectiveHandleScope* source_;
};
// TODO Maybe give this the ability to retrieve the type and ref, if it's useful.
class HeapReflectiveSourceInfo : public ReflectionSourceInfo {
public:
HeapReflectiveSourceInfo(ReflectionSourceType t, mirror::Object* src)
: ReflectionSourceInfo(t), src_(src) {}
void Describe(std::ostream& os) const override;
private:
ObjPtr<mirror::Object> src_;
};
// TODO Maybe give this the ability to retrieve the id if it's useful.
template <typename T,
typename = typename std::enable_if_t<std::is_same_v<T, jmethodID> ||
std::is_same_v<T, jfieldID>>>
class JniIdReflectiveSourceInfo : public ReflectionSourceInfo {
public:
explicit JniIdReflectiveSourceInfo(T id)
: ReflectionSourceInfo(std::is_same_v<T, jmethodID> ? kSourceJniMethodId : kSourceJniFieldId),
id_(id) {}
void Describe(std::ostream& os) const override;
private:
T id_;
};
class DexCacheSourceInfo : public ReflectionSourceInfo {
public:
explicit DexCacheSourceInfo(ReflectionSourceType type,
size_t index,
ObjPtr<mirror::DexCache> cache)
: ReflectionSourceInfo(type), index_(index), cache_(cache) {}
void Describe(std::ostream& os) const override REQUIRES(Locks::mutator_lock_) {
ReflectionSourceInfo::Describe(os);
os << " index=" << index_ << " cache_=" << cache_.PtrUnchecked()
<< " files=" << *cache_->GetDexFile();
}
private:
size_t index_;
ObjPtr<mirror::DexCache> cache_;
};
} // namespace art
#endif // ART_RUNTIME_REFLECTIVE_VALUE_VISITOR_H_
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