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/*
* 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 "reflection.h"
#include "class_linker.h"
#include "common_throws.h"
#include "dex_file-inl.h"
#include "invoke_arg_array_builder.h"
#include "jni_internal.h"
#include "mirror/art_field-inl.h"
#include "mirror/art_method-inl.h"
#include "mirror/class.h"
#include "mirror/class-inl.h"
#include "mirror/object_array.h"
#include "mirror/object_array-inl.h"
#include "object_utils.h"
#include "scoped_thread_state_change.h"
#include "well_known_classes.h"
namespace art {
jobject InvokeMethod(const ScopedObjectAccess& soa, jobject javaMethod, jobject javaReceiver,
jobject javaArgs) {
jmethodID mid = soa.Env()->FromReflectedMethod(javaMethod);
mirror::ArtMethod* m = soa.DecodeMethod(mid);
mirror::Class* declaring_class = m->GetDeclaringClass();
if (!Runtime::Current()->GetClassLinker()->EnsureInitialized(declaring_class, true, true)) {
return NULL;
}
mirror::Object* receiver = NULL;
if (!m->IsStatic()) {
// Check that the receiver is non-null and an instance of the field's declaring class.
receiver = soa.Decode<mirror::Object*>(javaReceiver);
if (!VerifyObjectInClass(receiver, declaring_class)) {
return NULL;
}
// Find the actual implementation of the virtual method.
m = receiver->GetClass()->FindVirtualMethodForVirtualOrInterface(m);
mid = soa.EncodeMethod(m);
}
// Get our arrays of arguments and their types, and check they're the same size.
mirror::ObjectArray<mirror::Object>* objects =
soa.Decode<mirror::ObjectArray<mirror::Object>*>(javaArgs);
MethodHelper mh(m);
const DexFile::TypeList* classes = mh.GetParameterTypeList();
uint32_t classes_size = classes == NULL ? 0 : classes->Size();
uint32_t arg_count = (objects != NULL) ? objects->GetLength() : 0;
if (arg_count != classes_size) {
ThrowIllegalArgumentException(NULL,
StringPrintf("Wrong number of arguments; expected %d, got %d",
classes_size, arg_count).c_str());
return NULL;
}
// Translate javaArgs to a jvalue[].
UniquePtr<jvalue[]> args(new jvalue[arg_count]);
JValue* decoded_args = reinterpret_cast<JValue*>(args.get());
for (uint32_t i = 0; i < arg_count; ++i) {
mirror::Object* arg = objects->Get(i);
mirror::Class* dst_class = mh.GetClassFromTypeIdx(classes->GetTypeItem(i).type_idx_);
if (!UnboxPrimitiveForArgument(arg, dst_class, decoded_args[i], m, i)) {
return NULL;
}
if (!dst_class->IsPrimitive()) {
args[i].l = soa.AddLocalReference<jobject>(arg);
}
}
// Invoke the method.
JValue value(InvokeWithJValues(soa, javaReceiver, mid, args.get()));
// Wrap any exception with "Ljava/lang/reflect/InvocationTargetException;" and return early.
if (soa.Self()->IsExceptionPending()) {
jthrowable th = soa.Env()->ExceptionOccurred();
soa.Env()->ExceptionClear();
jclass exception_class = soa.Env()->FindClass("java/lang/reflect/InvocationTargetException");
jmethodID mid = soa.Env()->GetMethodID(exception_class, "<init>", "(Ljava/lang/Throwable;)V");
jobject exception_instance = soa.Env()->NewObject(exception_class, mid, th);
soa.Env()->Throw(reinterpret_cast<jthrowable>(exception_instance));
return NULL;
}
// Box if necessary and return.
return soa.AddLocalReference<jobject>(BoxPrimitive(mh.GetReturnType()->GetPrimitiveType(), value));
}
bool VerifyObjectInClass(mirror::Object* o, mirror::Class* c) {
if (o == NULL) {
ThrowNullPointerException(NULL, "null receiver");
return false;
} else if (!o->InstanceOf(c)) {
std::string expected_class_name(PrettyDescriptor(c));
std::string actual_class_name(PrettyTypeOf(o));
ThrowIllegalArgumentException(NULL,
StringPrintf("Expected receiver of type %s, but got %s",
expected_class_name.c_str(),
actual_class_name.c_str()).c_str());
return false;
}
return true;
}
bool ConvertPrimitiveValue(const ThrowLocation* throw_location, bool unbox_for_result,
Primitive::Type srcType, Primitive::Type dstType,
const JValue& src, JValue& dst) {
CHECK(srcType != Primitive::kPrimNot && dstType != Primitive::kPrimNot);
switch (dstType) {
case Primitive::kPrimBoolean:
if (srcType == Primitive::kPrimBoolean) {
dst.SetZ(src.GetZ());
return true;
}
break;
case Primitive::kPrimChar:
if (srcType == Primitive::kPrimChar) {
dst.SetC(src.GetC());
return true;
}
break;
case Primitive::kPrimByte:
if (srcType == Primitive::kPrimByte) {
dst.SetB(src.GetB());
return true;
}
break;
case Primitive::kPrimShort:
if (srcType == Primitive::kPrimByte || srcType == Primitive::kPrimShort) {
dst.SetS(src.GetI());
return true;
}
break;
case Primitive::kPrimInt:
if (srcType == Primitive::kPrimByte || srcType == Primitive::kPrimChar ||
srcType == Primitive::kPrimShort || srcType == Primitive::kPrimInt) {
dst.SetI(src.GetI());
return true;
}
break;
case Primitive::kPrimLong:
if (srcType == Primitive::kPrimByte || srcType == Primitive::kPrimChar ||
srcType == Primitive::kPrimShort || srcType == Primitive::kPrimInt) {
dst.SetJ(src.GetI());
return true;
} else if (srcType == Primitive::kPrimLong) {
dst.SetJ(src.GetJ());
return true;
}
break;
case Primitive::kPrimFloat:
if (srcType == Primitive::kPrimByte || srcType == Primitive::kPrimChar ||
srcType == Primitive::kPrimShort || srcType == Primitive::kPrimInt) {
dst.SetF(src.GetI());
return true;
} else if (srcType == Primitive::kPrimLong) {
dst.SetF(src.GetJ());
return true;
} else if (srcType == Primitive::kPrimFloat) {
dst.SetF(src.GetF());
return true;
}
break;
case Primitive::kPrimDouble:
if (srcType == Primitive::kPrimByte || srcType == Primitive::kPrimChar ||
srcType == Primitive::kPrimShort || srcType == Primitive::kPrimInt) {
dst.SetD(src.GetI());
return true;
} else if (srcType == Primitive::kPrimLong) {
dst.SetD(src.GetJ());
return true;
} else if (srcType == Primitive::kPrimFloat) {
dst.SetD(src.GetF());
return true;
} else if (srcType == Primitive::kPrimDouble) {
dst.SetJ(src.GetJ());
return true;
}
break;
default:
break;
}
if (!unbox_for_result) {
ThrowIllegalArgumentException(throw_location,
StringPrintf("Invalid primitive conversion from %s to %s",
PrettyDescriptor(srcType).c_str(),
PrettyDescriptor(dstType).c_str()).c_str());
} else {
ThrowClassCastException(throw_location,
StringPrintf("Couldn't convert result of type %s to %s",
PrettyDescriptor(srcType).c_str(),
PrettyDescriptor(dstType).c_str()).c_str());
}
return false;
}
mirror::Object* BoxPrimitive(Primitive::Type src_class, const JValue& value) {
if (src_class == Primitive::kPrimNot) {
return value.GetL();
}
jmethodID m = NULL;
switch (src_class) {
case Primitive::kPrimBoolean:
m = WellKnownClasses::java_lang_Boolean_valueOf;
break;
case Primitive::kPrimByte:
m = WellKnownClasses::java_lang_Byte_valueOf;
break;
case Primitive::kPrimChar:
m = WellKnownClasses::java_lang_Character_valueOf;
break;
case Primitive::kPrimDouble:
m = WellKnownClasses::java_lang_Double_valueOf;
break;
case Primitive::kPrimFloat:
m = WellKnownClasses::java_lang_Float_valueOf;
break;
case Primitive::kPrimInt:
m = WellKnownClasses::java_lang_Integer_valueOf;
break;
case Primitive::kPrimLong:
m = WellKnownClasses::java_lang_Long_valueOf;
break;
case Primitive::kPrimShort:
m = WellKnownClasses::java_lang_Short_valueOf;
break;
case Primitive::kPrimVoid:
// There's no such thing as a void field, and void methods invoked via reflection return null.
return NULL;
default:
LOG(FATAL) << static_cast<int>(src_class);
}
ScopedObjectAccessUnchecked soa(Thread::Current());
if (kIsDebugBuild) {
CHECK_EQ(soa.Self()->GetState(), kRunnable);
}
ArgArray arg_array(NULL, 0);
JValue result;
if (src_class == Primitive::kPrimDouble || src_class == Primitive::kPrimLong) {
arg_array.AppendWide(value.GetJ());
} else {
arg_array.Append(value.GetI());
}
soa.DecodeMethod(m)->Invoke(soa.Self(), arg_array.GetArray(), arg_array.GetNumBytes(),
&result, 'L');
return result.GetL();
}
static std::string UnboxingFailureKind(mirror::ArtMethod* m, int index, mirror::ArtField* f)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
if (m != NULL && index != -1) {
++index; // Humans count from 1.
return StringPrintf("method %s argument %d", PrettyMethod(m, false).c_str(), index);
}
if (f != NULL) {
return "field " + PrettyField(f, false);
}
return "result";
}
static bool UnboxPrimitive(const ThrowLocation* throw_location, mirror::Object* o,
mirror::Class* dst_class, JValue& unboxed_value,
mirror::ArtMethod* m, int index, mirror::ArtField* f)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
bool unbox_for_result = (f == NULL) && (index == -1);
if (!dst_class->IsPrimitive()) {
if (UNLIKELY(o != NULL && !o->InstanceOf(dst_class))) {
if (!unbox_for_result) {
ThrowIllegalArgumentException(throw_location,
StringPrintf("%s has type %s, got %s",
UnboxingFailureKind(m, index, f).c_str(),
PrettyDescriptor(dst_class).c_str(),
PrettyTypeOf(o).c_str()).c_str());
} else {
ThrowClassCastException(throw_location,
StringPrintf("Couldn't convert result of type %s to %s",
PrettyTypeOf(o).c_str(),
PrettyDescriptor(dst_class).c_str()).c_str());
}
return false;
}
unboxed_value.SetL(o);
return true;
}
if (UNLIKELY(dst_class->GetPrimitiveType() == Primitive::kPrimVoid)) {
ThrowIllegalArgumentException(throw_location,
StringPrintf("Can't unbox %s to void",
UnboxingFailureKind(m, index, f).c_str()).c_str());
return false;
}
if (UNLIKELY(o == NULL)) {
if (!unbox_for_result) {
ThrowIllegalArgumentException(throw_location,
StringPrintf("%s has type %s, got null",
UnboxingFailureKind(m, index, f).c_str(),
PrettyDescriptor(dst_class).c_str()).c_str());
} else {
ThrowNullPointerException(throw_location,
StringPrintf("Expected to unbox a '%s' primitive type but was returned null",
PrettyDescriptor(dst_class).c_str()).c_str());
}
return false;
}
JValue boxed_value;
const StringPiece src_descriptor(ClassHelper(o->GetClass()).GetDescriptor());
mirror::Class* src_class = NULL;
ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
mirror::ArtField* primitive_field = o->GetClass()->GetIFields()->Get(0);
if (src_descriptor == "Ljava/lang/Boolean;") {
src_class = class_linker->FindPrimitiveClass('Z');
boxed_value.SetZ(primitive_field->GetBoolean(o));
} else if (src_descriptor == "Ljava/lang/Byte;") {
src_class = class_linker->FindPrimitiveClass('B');
boxed_value.SetB(primitive_field->GetByte(o));
} else if (src_descriptor == "Ljava/lang/Character;") {
src_class = class_linker->FindPrimitiveClass('C');
boxed_value.SetC(primitive_field->GetChar(o));
} else if (src_descriptor == "Ljava/lang/Float;") {
src_class = class_linker->FindPrimitiveClass('F');
boxed_value.SetF(primitive_field->GetFloat(o));
} else if (src_descriptor == "Ljava/lang/Double;") {
src_class = class_linker->FindPrimitiveClass('D');
boxed_value.SetD(primitive_field->GetDouble(o));
} else if (src_descriptor == "Ljava/lang/Integer;") {
src_class = class_linker->FindPrimitiveClass('I');
boxed_value.SetI(primitive_field->GetInt(o));
} else if (src_descriptor == "Ljava/lang/Long;") {
src_class = class_linker->FindPrimitiveClass('J');
boxed_value.SetJ(primitive_field->GetLong(o));
} else if (src_descriptor == "Ljava/lang/Short;") {
src_class = class_linker->FindPrimitiveClass('S');
boxed_value.SetS(primitive_field->GetShort(o));
} else {
ThrowIllegalArgumentException(throw_location,
StringPrintf("%s has type %s, got %s",
UnboxingFailureKind(m, index, f).c_str(),
PrettyDescriptor(dst_class).c_str(),
PrettyDescriptor(src_descriptor.data()).c_str()).c_str());
return false;
}
return ConvertPrimitiveValue(throw_location, unbox_for_result,
src_class->GetPrimitiveType(), dst_class->GetPrimitiveType(),
boxed_value, unboxed_value);
}
bool UnboxPrimitiveForArgument(mirror::Object* o, mirror::Class* dst_class, JValue& unboxed_value,
mirror::ArtMethod* m, size_t index) {
CHECK(m != NULL);
return UnboxPrimitive(NULL, o, dst_class, unboxed_value, m, index, NULL);
}
bool UnboxPrimitiveForField(mirror::Object* o, mirror::Class* dst_class, JValue& unboxed_value,
mirror::ArtField* f) {
CHECK(f != NULL);
return UnboxPrimitive(NULL, o, dst_class, unboxed_value, NULL, -1, f);
}
bool UnboxPrimitiveForResult(const ThrowLocation& throw_location, mirror::Object* o,
mirror::Class* dst_class, JValue& unboxed_value) {
return UnboxPrimitive(&throw_location, o, dst_class, unboxed_value, NULL, -1, NULL);
}
} // namespace art