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/*
* Copyright (C) 2016 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 "java_lang_reflect_Executable.h"
#include "android-base/stringprintf.h"
#include "nativehelper/jni_macros.h"
#include "art_method-inl.h"
#include "class_root.h"
#include "dex/dex_file_annotations.h"
#include "handle.h"
#include "jni/jni_internal.h"
#include "mirror/class-alloc-inl.h"
#include "mirror/class-inl.h"
#include "mirror/method.h"
#include "mirror/object-inl.h"
#include "mirror/object_array-alloc-inl.h"
#include "mirror/object_array-inl.h"
#include "native_util.h"
#include "reflection.h"
#include "scoped_fast_native_object_access-inl.h"
#include "well_known_classes.h"
namespace art {
using android::base::StringPrintf;
static jobjectArray Executable_getDeclaredAnnotationsNative(JNIEnv* env, jobject javaMethod) {
ScopedFastNativeObjectAccess soa(env);
ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod);
if (method->GetDeclaringClass()->IsProxyClass()) {
// Return an empty array instead of a null pointer.
ObjPtr<mirror::Class> annotation_array_class =
soa.Decode<mirror::Class>(WellKnownClasses::java_lang_annotation_Annotation__array);
ObjPtr<mirror::ObjectArray<mirror::Object>> empty_array =
mirror::ObjectArray<mirror::Object>::Alloc(soa.Self(), annotation_array_class, 0);
return soa.AddLocalReference<jobjectArray>(empty_array);
}
return soa.AddLocalReference<jobjectArray>(annotations::GetAnnotationsForMethod(method));
}
static jobject Executable_getAnnotationNative(JNIEnv* env,
jobject javaMethod,
jclass annotationType) {
ScopedFastNativeObjectAccess soa(env);
StackHandleScope<1> hs(soa.Self());
ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod);
if (method->IsProxyMethod()) {
return nullptr;
} else {
Handle<mirror::Class> klass(hs.NewHandle(soa.Decode<mirror::Class>(annotationType)));
return soa.AddLocalReference<jobject>(annotations::GetAnnotationForMethod(method, klass));
}
}
static jobjectArray Executable_getSignatureAnnotation(JNIEnv* env, jobject javaMethod) {
ScopedFastNativeObjectAccess soa(env);
ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod);
if (method->GetDeclaringClass()->IsProxyClass()) {
return nullptr;
}
return soa.AddLocalReference<jobjectArray>(annotations::GetSignatureAnnotationForMethod(method));
}
static jobjectArray Executable_getParameterAnnotationsNative(JNIEnv* env, jobject javaMethod) {
ScopedFastNativeObjectAccess soa(env);
ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod);
if (method->IsProxyMethod()) {
return nullptr;
}
StackHandleScope<4> hs(soa.Self());
Handle<mirror::ObjectArray<mirror::Object>> annotations =
hs.NewHandle(annotations::GetParameterAnnotations(method));
if (annotations.IsNull()) {
return nullptr;
}
// If the method is not a constructor, or has parameter annotations
// for each parameter, then we can return those annotations
// unmodified. Otherwise, we need to look at whether the
// constructor has implicit parameters as these may need padding
// with empty parameter annotations.
if (!method->IsConstructor() ||
annotations->GetLength() == static_cast<int>(method->GetNumberOfParameters())) {
return soa.AddLocalReference<jobjectArray>(annotations.Get());
}
// If declaring class is a local or an enum, do not pad parameter
// annotations, as the implicit constructor parameters are an implementation
// detail rather than required by JLS.
Handle<mirror::Class> declaring_class = hs.NewHandle(method->GetDeclaringClass());
if (annotations::GetEnclosingMethod(declaring_class) != nullptr ||
declaring_class->IsEnum()) {
return soa.AddLocalReference<jobjectArray>(annotations.Get());
}
// Prepare to resize the annotations so there is 1:1 correspondence
// with the constructor parameters.
Handle<mirror::ObjectArray<mirror::Object>> resized_annotations = hs.NewHandle(
mirror::ObjectArray<mirror::Object>::Alloc(
soa.Self(),
annotations->GetClass(),
static_cast<int>(method->GetNumberOfParameters())));
if (resized_annotations.IsNull()) {
DCHECK(soa.Self()->IsExceptionPending());
return nullptr;
}
static constexpr bool kTransactionActive = false;
const int32_t offset = resized_annotations->GetLength() - annotations->GetLength();
if (offset > 0) {
// Workaround for dexers (d8/dx) that do not insert annotations
// for implicit parameters (b/68033708).
ObjPtr<mirror::Class> annotation_array_class =
soa.Decode<mirror::Class>(WellKnownClasses::java_lang_annotation_Annotation__array);
Handle<mirror::ObjectArray<mirror::Object>> empty_annotations = hs.NewHandle(
mirror::ObjectArray<mirror::Object>::Alloc(soa.Self(), annotation_array_class, 0));
if (empty_annotations.IsNull()) {
DCHECK(soa.Self()->IsExceptionPending());
return nullptr;
}
for (int i = 0; i < offset; ++i) {
resized_annotations->SetWithoutChecks<kTransactionActive>(i, empty_annotations.Get());
}
for (int i = 0; i < annotations->GetLength(); ++i) {
ObjPtr<mirror::Object> annotation = annotations->GetWithoutChecks(i);
resized_annotations->SetWithoutChecks<kTransactionActive>(i + offset, annotation);
}
} else {
// Workaround for Jack (defunct) erroneously inserting annotations
// for local classes (b/68033708).
DCHECK_LT(offset, 0);
for (int i = 0; i < resized_annotations->GetLength(); ++i) {
ObjPtr<mirror::Object> annotation = annotations->GetWithoutChecks(i - offset);
resized_annotations->SetWithoutChecks<kTransactionActive>(i, annotation);
}
}
return soa.AddLocalReference<jobjectArray>(resized_annotations.Get());
}
static jobjectArray Executable_getParameters0(JNIEnv* env, jobject javaMethod) {
ScopedFastNativeObjectAccess soa(env);
Thread* self = soa.Self();
StackHandleScope<8> hs(self);
Handle<mirror::Method> executable = hs.NewHandle(soa.Decode<mirror::Method>(javaMethod));
ArtMethod* art_method = executable.Get()->GetArtMethod();
if (art_method->GetDeclaringClass()->IsProxyClass()) {
return nullptr;
}
// Find the MethodParameters system annotation.
MutableHandle<mirror::ObjectArray<mirror::String>> names =
hs.NewHandle<mirror::ObjectArray<mirror::String>>(nullptr);
MutableHandle<mirror::IntArray> access_flags = hs.NewHandle<mirror::IntArray>(nullptr);
if (!annotations::GetParametersMetadataForMethod(art_method, &names, &access_flags)) {
return nullptr;
}
// Validate the MethodParameters system annotation data.
if (UNLIKELY(names == nullptr || access_flags == nullptr)) {
ThrowIllegalArgumentException(
StringPrintf("Missing parameter metadata for names or access flags for %s",
art_method->PrettyMethod().c_str()).c_str());
return nullptr;
}
// Check array sizes match each other
int32_t names_count = names.Get()->GetLength();
int32_t access_flags_count = access_flags.Get()->GetLength();
if (names_count != access_flags_count) {
ThrowIllegalArgumentException(
StringPrintf(
"Inconsistent parameter metadata for %s. names length: %d, access flags length: %d",
art_method->PrettyMethod().c_str(),
names_count,
access_flags_count).c_str());
return nullptr;
}
// Instantiate a Parameter[] to hold the result.
Handle<mirror::Class> parameter_array_class =
hs.NewHandle(
soa.Decode<mirror::Class>(WellKnownClasses::java_lang_reflect_Parameter__array));
Handle<mirror::ObjectArray<mirror::Object>> parameter_array =
hs.NewHandle(
mirror::ObjectArray<mirror::Object>::Alloc(self,
parameter_array_class.Get(),
names_count));
if (UNLIKELY(parameter_array == nullptr)) {
self->AssertPendingException();
return nullptr;
}
Handle<mirror::Class> parameter_class =
hs.NewHandle(soa.Decode<mirror::Class>(WellKnownClasses::java_lang_reflect_Parameter));
ArtMethod* parameter_init =
jni::DecodeArtMethod(WellKnownClasses::java_lang_reflect_Parameter_init);
// Mutable handles used in the loop below to ensure cleanup without scaling the number of
// handles by the number of parameters.
MutableHandle<mirror::String> name = hs.NewHandle<mirror::String>(nullptr);
MutableHandle<mirror::Object> parameter = hs.NewHandle<mirror::Object>(nullptr);
// Populate the Parameter[] to return.
for (int32_t parameter_index = 0; parameter_index < names_count; parameter_index++) {
name.Assign(names.Get()->Get(parameter_index));
int32_t modifiers = access_flags.Get()->Get(parameter_index);
// Allocate / initialize the Parameter to add to parameter_array.
parameter.Assign(parameter_class->AllocObject(self));
if (UNLIKELY(parameter == nullptr)) {
self->AssertPendingOOMException();
return nullptr;
}
uint32_t args[5] = { PointerToLowMemUInt32(parameter.Get()),
PointerToLowMemUInt32(name.Get()),
static_cast<uint32_t>(modifiers),
PointerToLowMemUInt32(executable.Get()),
static_cast<uint32_t>(parameter_index)
};
JValue result;
static const char* method_signature = "VLILI"; // return + parameter types
parameter_init->Invoke(self, args, sizeof(args), &result, method_signature);
if (UNLIKELY(self->IsExceptionPending())) {
return nullptr;
}
// Store the Parameter in the Parameter[].
parameter_array.Get()->Set(parameter_index, parameter.Get());
if (UNLIKELY(self->IsExceptionPending())) {
return nullptr;
}
}
return soa.AddLocalReference<jobjectArray>(parameter_array.Get());
}
static jboolean Executable_isAnnotationPresentNative(JNIEnv* env,
jobject javaMethod,
jclass annotationType) {
ScopedFastNativeObjectAccess soa(env);
ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod);
if (method->GetDeclaringClass()->IsProxyClass()) {
return false;
}
StackHandleScope<1> hs(soa.Self());
Handle<mirror::Class> klass(hs.NewHandle(soa.Decode<mirror::Class>(annotationType)));
return annotations::IsMethodAnnotationPresent(method, klass);
}
static jint Executable_compareMethodParametersInternal(JNIEnv* env,
jobject thisMethod,
jobject otherMethod) {
ScopedFastNativeObjectAccess soa(env);
ArtMethod* this_method = ArtMethod::FromReflectedMethod(soa, thisMethod);
ArtMethod* other_method = ArtMethod::FromReflectedMethod(soa, otherMethod);
this_method = this_method->GetInterfaceMethodIfProxy(kRuntimePointerSize);
other_method = other_method->GetInterfaceMethodIfProxy(kRuntimePointerSize);
const DexFile::TypeList* this_list = this_method->GetParameterTypeList();
const DexFile::TypeList* other_list = other_method->GetParameterTypeList();
if (this_list == other_list) {
return 0;
}
if (this_list == nullptr && other_list != nullptr) {
return -1;
}
if (other_list == nullptr && this_list != nullptr) {
return 1;
}
const int32_t this_size = this_list->Size();
const int32_t other_size = other_list->Size();
if (this_size != other_size) {
return (this_size - other_size);
}
for (int32_t i = 0; i < this_size; ++i) {
const DexFile::TypeId& lhs = this_method->GetDexFile()->GetTypeId(
this_list->GetTypeItem(i).type_idx_);
const DexFile::TypeId& rhs = other_method->GetDexFile()->GetTypeId(
other_list->GetTypeItem(i).type_idx_);
uint32_t lhs_len, rhs_len;
const char* lhs_data = this_method->GetDexFile()->StringDataAndUtf16LengthByIdx(
lhs.descriptor_idx_, &lhs_len);
const char* rhs_data = other_method->GetDexFile()->StringDataAndUtf16LengthByIdx(
rhs.descriptor_idx_, &rhs_len);
int cmp = strcmp(lhs_data, rhs_data);
if (cmp != 0) {
return (cmp < 0) ? -1 : 1;
}
}
return 0;
}
static jstring Executable_getMethodNameInternal(JNIEnv* env, jobject javaMethod) {
ScopedFastNativeObjectAccess soa(env);
ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod);
method = method->GetInterfaceMethodIfProxy(kRuntimePointerSize);
return soa.AddLocalReference<jstring>(method->ResolveNameString());
}
static jclass Executable_getMethodReturnTypeInternal(JNIEnv* env, jobject javaMethod) {
ScopedFastNativeObjectAccess soa(env);
ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod);
method = method->GetInterfaceMethodIfProxy(kRuntimePointerSize);
ObjPtr<mirror::Class> return_type(method->ResolveReturnType());
if (return_type.IsNull()) {
CHECK(soa.Self()->IsExceptionPending());
return nullptr;
}
return soa.AddLocalReference<jclass>(return_type);
}
static jobjectArray Executable_getParameterTypesInternal(JNIEnv* env, jobject javaMethod) {
ScopedFastNativeObjectAccess soa(env);
ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod);
method = method->GetInterfaceMethodIfProxy(kRuntimePointerSize);
const DexFile::TypeList* params = method->GetParameterTypeList();
if (params == nullptr) {
return nullptr;
}
const uint32_t num_params = params->Size();
StackHandleScope<2> hs(soa.Self());
ObjPtr<mirror::Class> class_array_class = GetClassRoot<mirror::ObjectArray<mirror::Class>>();
Handle<mirror::ObjectArray<mirror::Class>> ptypes = hs.NewHandle(
mirror::ObjectArray<mirror::Class>::Alloc(soa.Self(), class_array_class, num_params));
if (ptypes.IsNull()) {
DCHECK(soa.Self()->IsExceptionPending());
return nullptr;
}
MutableHandle<mirror::Class> param(hs.NewHandle<mirror::Class>(nullptr));
for (uint32_t i = 0; i < num_params; ++i) {
const dex::TypeIndex type_idx = params->GetTypeItem(i).type_idx_;
param.Assign(Runtime::Current()->GetClassLinker()->ResolveType(type_idx, method));
if (param.Get() == nullptr) {
DCHECK(soa.Self()->IsExceptionPending());
return nullptr;
}
ptypes->SetWithoutChecks<false>(i, param.Get());
}
return soa.AddLocalReference<jobjectArray>(ptypes.Get());
}
static jint Executable_getParameterCountInternal(JNIEnv* env, jobject javaMethod) {
ScopedFastNativeObjectAccess soa(env);
ArtMethod* method = ArtMethod::FromReflectedMethod(soa, javaMethod);
method = method->GetInterfaceMethodIfProxy(kRuntimePointerSize);
const DexFile::TypeList* params = method->GetParameterTypeList();
return (params == nullptr) ? 0 : params->Size();
}
static JNINativeMethod gMethods[] = {
FAST_NATIVE_METHOD(Executable, compareMethodParametersInternal,
"(Ljava/lang/reflect/Method;)I"),
FAST_NATIVE_METHOD(Executable, getAnnotationNative,
"(Ljava/lang/Class;)Ljava/lang/annotation/Annotation;"),
FAST_NATIVE_METHOD(Executable, getDeclaredAnnotationsNative,
"()[Ljava/lang/annotation/Annotation;"),
FAST_NATIVE_METHOD(Executable, getParameterAnnotationsNative,
"()[[Ljava/lang/annotation/Annotation;"),
FAST_NATIVE_METHOD(Executable, getMethodNameInternal, "()Ljava/lang/String;"),
FAST_NATIVE_METHOD(Executable, getMethodReturnTypeInternal, "()Ljava/lang/Class;"),
FAST_NATIVE_METHOD(Executable, getParameterTypesInternal, "()[Ljava/lang/Class;"),
FAST_NATIVE_METHOD(Executable, getParameterCountInternal, "()I"),
FAST_NATIVE_METHOD(Executable, getParameters0, "()[Ljava/lang/reflect/Parameter;"),
FAST_NATIVE_METHOD(Executable, getSignatureAnnotation, "()[Ljava/lang/String;"),
FAST_NATIVE_METHOD(Executable, isAnnotationPresentNative, "(Ljava/lang/Class;)Z"),
};
void register_java_lang_reflect_Executable(JNIEnv* env) {
REGISTER_NATIVE_METHODS("java/lang/reflect/Executable");
}
} // namespace art