/*
* 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-inl.h"
#include "art_field-inl.h"
#include "art_method-inl.h"
#include "base/enums.h"
#include "class_linker.h"
#include "common_throws.h"
#include "dex/dex_file-inl.h"
#include "indirect_reference_table-inl.h"
#include "java_vm_ext.h"
#include "jni_internal.h"
#include "mirror/class-inl.h"
#include "mirror/executable.h"
#include "mirror/object_array-inl.h"
#include "nativehelper/scoped_local_ref.h"
#include "nth_caller_visitor.h"
#include "scoped_thread_state_change-inl.h"
#include "stack_reference.h"
#include "well_known_classes.h"
namespace art {
namespace {
using android::base::StringPrintf;
class ArgArray {
public:
ArgArray(const char* shorty, uint32_t shorty_len)
: shorty_(shorty), shorty_len_(shorty_len), num_bytes_(0) {
size_t num_slots = shorty_len + 1; // +1 in case of receiver.
if (LIKELY((num_slots * 2) < kSmallArgArraySize)) {
// We can trivially use the small arg array.
arg_array_ = small_arg_array_;
} else {
// Analyze shorty to see if we need the large arg array.
for (size_t i = 1; i < shorty_len; ++i) {
char c = shorty[i];
if (c == 'J' || c == 'D') {
num_slots++;
}
}
if (num_slots <= kSmallArgArraySize) {
arg_array_ = small_arg_array_;
} else {
large_arg_array_.reset(new uint32_t[num_slots]);
arg_array_ = large_arg_array_.get();
}
}
}
uint32_t* GetArray() {
return arg_array_;
}
uint32_t GetNumBytes() {
return num_bytes_;
}
void Append(uint32_t value) {
arg_array_[num_bytes_ / 4] = value;
num_bytes_ += 4;
}
void Append(ObjPtr<mirror::Object> obj) REQUIRES_SHARED(Locks::mutator_lock_) {
Append(StackReference<mirror::Object>::FromMirrorPtr(obj.Ptr()).AsVRegValue());
}
void AppendWide(uint64_t value) {
arg_array_[num_bytes_ / 4] = value;
arg_array_[(num_bytes_ / 4) + 1] = value >> 32;
num_bytes_ += 8;
}
void AppendFloat(float value) {
jvalue jv;
jv.f = value;
Append(jv.i);
}
void AppendDouble(double value) {
jvalue jv;
jv.d = value;
AppendWide(jv.j);
}
void BuildArgArrayFromVarArgs(const ScopedObjectAccessAlreadyRunnable& soa,
ObjPtr<mirror::Object> receiver,
va_list ap)
REQUIRES_SHARED(Locks::mutator_lock_) {
// Set receiver if non-null (method is not static)
if (receiver != nullptr) {
Append(receiver);
}
for (size_t i = 1; i < shorty_len_; ++i) {
switch (shorty_[i]) {
case 'Z':
case 'B':
case 'C':
case 'S':
case 'I':
Append(va_arg(ap, jint));
break;
case 'F':
AppendFloat(va_arg(ap, jdouble));
break;
case 'L':
Append(soa.Decode<mirror::Object>(va_arg(ap, jobject)));
break;
case 'D':
AppendDouble(va_arg(ap, jdouble));
break;
case 'J':
AppendWide(va_arg(ap, jlong));
break;
#ifndef NDEBUG
default:
LOG(FATAL) << "Unexpected shorty character: " << shorty_[i];
#endif
}
}
}
void BuildArgArrayFromJValues(const ScopedObjectAccessAlreadyRunnable& soa,
ObjPtr<mirror::Object> receiver, jvalue* args)
REQUIRES_SHARED(Locks::mutator_lock_) {
// Set receiver if non-null (method is not static)
if (receiver != nullptr) {
Append(receiver);
}
for (size_t i = 1, args_offset = 0; i < shorty_len_; ++i, ++args_offset) {
switch (shorty_[i]) {
case 'Z':
Append(args[args_offset].z);
break;
case 'B':
Append(args[args_offset].b);
break;
case 'C':
Append(args[args_offset].c);
break;
case 'S':
Append(args[args_offset].s);
break;
case 'I':
FALLTHROUGH_INTENDED;
case 'F':
Append(args[args_offset].i);
break;
case 'L':
Append(soa.Decode<mirror::Object>(args[args_offset].l));
break;
case 'D':
FALLTHROUGH_INTENDED;
case 'J':
AppendWide(args[args_offset].j);
break;
#ifndef NDEBUG
default:
LOG(FATAL) << "Unexpected shorty character: " << shorty_[i];
#endif
}
}
}
void BuildArgArrayFromFrame(ShadowFrame* shadow_frame, uint32_t arg_offset)
REQUIRES_SHARED(Locks::mutator_lock_) {
// Set receiver if non-null (method is not static)
size_t cur_arg = arg_offset;
if (!shadow_frame->GetMethod()->IsStatic()) {
Append(shadow_frame->GetVReg(cur_arg));
cur_arg++;
}
for (size_t i = 1; i < shorty_len_; ++i) {
switch (shorty_[i]) {
case 'Z':
case 'B':
case 'C':
case 'S':
case 'I':
case 'F':
case 'L':
Append(shadow_frame->GetVReg(cur_arg));
cur_arg++;
break;
case 'D':
case 'J':
AppendWide(shadow_frame->GetVRegLong(cur_arg));
cur_arg++;
cur_arg++;
break;
#ifndef NDEBUG
default:
LOG(FATAL) << "Unexpected shorty character: " << shorty_[i];
#endif
}
}
}
static void ThrowIllegalPrimitiveArgumentException(const char* expected,
const char* found_descriptor)
REQUIRES_SHARED(Locks::mutator_lock_) {
ThrowIllegalArgumentException(
StringPrintf("Invalid primitive conversion from %s to %s", expected,
PrettyDescriptor(found_descriptor).c_str()).c_str());
}
bool BuildArgArrayFromObjectArray(ObjPtr<mirror::Object> receiver,
ObjPtr<mirror::ObjectArray<mirror::Object>> raw_args,
ArtMethod* m,
Thread* self)
REQUIRES_SHARED(Locks::mutator_lock_) {
const DexFile::TypeList* classes = m->GetParameterTypeList();
// Set receiver if non-null (method is not static)
if (receiver != nullptr) {
Append(receiver);
}
StackHandleScope<2> hs(self);
MutableHandle<mirror::Object> arg(hs.NewHandle<mirror::Object>(nullptr));
Handle<mirror::ObjectArray<mirror::Object>> args(
hs.NewHandle<mirror::ObjectArray<mirror::Object>>(raw_args));
for (size_t i = 1, args_offset = 0; i < shorty_len_; ++i, ++args_offset) {
arg.Assign(args->Get(args_offset));
if (((shorty_[i] == 'L') && (arg != nullptr)) ||
((arg == nullptr && shorty_[i] != 'L'))) {
// TODO: The method's parameter's type must have been previously resolved, yet
// we've seen cases where it's not b/34440020.
ObjPtr<mirror::Class> dst_class(
m->ResolveClassFromTypeIndex(classes->GetTypeItem(args_offset).type_idx_));
if (dst_class.Ptr() == nullptr) {
CHECK(self->IsExceptionPending());
return false;
}
if (UNLIKELY(arg == nullptr || !arg->InstanceOf(dst_class))) {
ThrowIllegalArgumentException(
StringPrintf("method %s argument %zd has type %s, got %s",
m->PrettyMethod(false).c_str(),
args_offset + 1, // Humans don't count from 0.
mirror::Class::PrettyDescriptor(dst_class).c_str(),
mirror::Object::PrettyTypeOf(arg.Get()).c_str()).c_str());
return false;
}
}
#define DO_FIRST_ARG(match_descriptor, get_fn, append) { \
if (LIKELY(arg != nullptr && \
arg->GetClass()->DescriptorEquals(match_descriptor))) { \
ArtField* primitive_field = arg->GetClass()->GetInstanceField(0); \
append(primitive_field-> get_fn(arg.Get()));
#define DO_ARG(match_descriptor, get_fn, append) \
} else if (LIKELY(arg != nullptr && \
arg->GetClass<>()->DescriptorEquals(match_descriptor))) { \
ArtField* primitive_field = arg->GetClass()->GetInstanceField(0); \
append(primitive_field-> get_fn(arg.Get()));
#define DO_FAIL(expected) \
} else { \
if (arg->GetClass<>()->IsPrimitive()) { \
std::string temp; \
ThrowIllegalPrimitiveArgumentException(expected, \
arg->GetClass<>()->GetDescriptor(&temp)); \
} else { \
ThrowIllegalArgumentException(\
StringPrintf("method %s argument %zd has type %s, got %s", \
ArtMethod::PrettyMethod(m, false).c_str(), \
args_offset + 1, \
expected, \
mirror::Object::PrettyTypeOf(arg.Get()).c_str()).c_str()); \
} \
return false; \
} }
switch (shorty_[i]) {
case 'L':
Append(arg.Get());
break;
case 'Z':
DO_FIRST_ARG("Ljava/lang/Boolean;", GetBoolean, Append)
DO_FAIL("boolean")
break;
case 'B':
DO_FIRST_ARG("Ljava/lang/Byte;", GetByte, Append)
DO_FAIL("byte")
break;
case 'C':
DO_FIRST_ARG("Ljava/lang/Character;", GetChar, Append)
DO_FAIL("char")
break;
case 'S':
DO_FIRST_ARG("Ljava/lang/Short;", GetShort, Append)
DO_ARG("Ljava/lang/Byte;", GetByte, Append)
DO_FAIL("short")
break;
case 'I':
DO_FIRST_ARG("Ljava/lang/Integer;", GetInt, Append)
DO_ARG("Ljava/lang/Character;", GetChar, Append)
DO_ARG("Ljava/lang/Short;", GetShort, Append)
DO_ARG("Ljava/lang/Byte;", GetByte, Append)
DO_FAIL("int")
break;
case 'J':
DO_FIRST_ARG("Ljava/lang/Long;", GetLong, AppendWide)
DO_ARG("Ljava/lang/Integer;", GetInt, AppendWide)
DO_ARG("Ljava/lang/Character;", GetChar, AppendWide)
DO_ARG("Ljava/lang/Short;", GetShort, AppendWide)
DO_ARG("Ljava/lang/Byte;", GetByte, AppendWide)
DO_FAIL("long")
break;
case 'F':
DO_FIRST_ARG("Ljava/lang/Float;", GetFloat, AppendFloat)
DO_ARG("Ljava/lang/Long;", GetLong, AppendFloat)
DO_ARG("Ljava/lang/Integer;", GetInt, AppendFloat)
DO_ARG("Ljava/lang/Character;", GetChar, AppendFloat)
DO_ARG("Ljava/lang/Short;", GetShort, AppendFloat)
DO_ARG("Ljava/lang/Byte;", GetByte, AppendFloat)
DO_FAIL("float")
break;
case 'D':
DO_FIRST_ARG("Ljava/lang/Double;", GetDouble, AppendDouble)
DO_ARG("Ljava/lang/Float;", GetFloat, AppendDouble)
DO_ARG("Ljava/lang/Long;", GetLong, AppendDouble)
DO_ARG("Ljava/lang/Integer;", GetInt, AppendDouble)
DO_ARG("Ljava/lang/Character;", GetChar, AppendDouble)
DO_ARG("Ljava/lang/Short;", GetShort, AppendDouble)
DO_ARG("Ljava/lang/Byte;", GetByte, AppendDouble)
DO_FAIL("double")
break;
#ifndef NDEBUG
default:
LOG(FATAL) << "Unexpected shorty character: " << shorty_[i];
UNREACHABLE();
#endif
}
#undef DO_FIRST_ARG
#undef DO_ARG
#undef DO_FAIL
}
return true;
}
private:
enum { kSmallArgArraySize = 16 };
const char* const shorty_;
const uint32_t shorty_len_;
uint32_t num_bytes_;
uint32_t* arg_array_;
uint32_t small_arg_array_[kSmallArgArraySize];
std::unique_ptr<uint32_t[]> large_arg_array_;
};
void CheckMethodArguments(JavaVMExt* vm, ArtMethod* m, uint32_t* args)
REQUIRES_SHARED(Locks::mutator_lock_) {
const DexFile::TypeList* params = m->GetParameterTypeList();
if (params == nullptr) {
return; // No arguments so nothing to check.
}
uint32_t offset = 0;
uint32_t num_params = params->Size();
size_t error_count = 0;
if (!m->IsStatic()) {
offset = 1;
}
// TODO: If args contain object references, it may cause problems.
Thread* const self = Thread::Current();
for (uint32_t i = 0; i < num_params; i++) {
dex::TypeIndex type_idx = params->GetTypeItem(i).type_idx_;
ObjPtr<mirror::Class> param_type(m->ResolveClassFromTypeIndex(type_idx));
if (param_type == nullptr) {
CHECK(self->IsExceptionPending());
LOG(ERROR) << "Internal error: unresolvable type for argument type in JNI invoke: "
<< m->GetTypeDescriptorFromTypeIdx(type_idx) << "\n"
<< self->GetException()->Dump();
self->ClearException();
++error_count;
} else if (!param_type->IsPrimitive()) {
// TODO: There is a compaction bug here since GetClassFromTypeIdx can cause thread suspension,
// this is a hard to fix problem since the args can contain Object*, we need to save and
// restore them by using a visitor similar to the ones used in the trampoline entrypoints.
ObjPtr<mirror::Object> argument =
(reinterpret_cast<StackReference<mirror::Object>*>(&args[i + offset]))->AsMirrorPtr();
if (argument != nullptr && !argument->InstanceOf(param_type)) {
LOG(ERROR) << "JNI ERROR (app bug): attempt to pass an instance of "
<< argument->PrettyTypeOf() << " as argument " << (i + 1)
<< " to " << m->PrettyMethod();
++error_count;
}
} else if (param_type->IsPrimitiveLong() || param_type->IsPrimitiveDouble()) {
offset++;
} else {
int32_t arg = static_cast<int32_t>(args[i + offset]);
if (param_type->IsPrimitiveBoolean()) {
if (arg != JNI_TRUE && arg != JNI_FALSE) {
LOG(ERROR) << "JNI ERROR (app bug): expected jboolean (0/1) but got value of "
<< arg << " as argument " << (i + 1) << " to " << m->PrettyMethod();
++error_count;
}
} else if (param_type->IsPrimitiveByte()) {
if (arg < -128 || arg > 127) {
LOG(ERROR) << "JNI ERROR (app bug): expected jbyte but got value of "
<< arg << " as argument " << (i + 1) << " to " << m->PrettyMethod();
++error_count;
}
} else if (param_type->IsPrimitiveChar()) {
if (args[i + offset] > 0xFFFF) {
LOG(ERROR) << "JNI ERROR (app bug): expected jchar but got value of "
<< arg << " as argument " << (i + 1) << " to " << m->PrettyMethod();
++error_count;
}
} else if (param_type->IsPrimitiveShort()) {
if (arg < -32768 || arg > 0x7FFF) {
LOG(ERROR) << "JNI ERROR (app bug): expected jshort but got value of "
<< arg << " as argument " << (i + 1) << " to " << m->PrettyMethod();
++error_count;
}
}
}
}
if (UNLIKELY(error_count > 0)) {
// TODO: pass the JNI function name (such as "CallVoidMethodV") through so we can call JniAbort
// with an argument.
vm->JniAbortF(nullptr, "bad arguments passed to %s (see above for details)",
m->PrettyMethod().c_str());
}
}
ArtMethod* FindVirtualMethod(ObjPtr<mirror::Object> receiver, ArtMethod* method)
REQUIRES_SHARED(Locks::mutator_lock_) {
return receiver->GetClass()->FindVirtualMethodForVirtualOrInterface(method, kRuntimePointerSize);
}
void InvokeWithArgArray(const ScopedObjectAccessAlreadyRunnable& soa,
ArtMethod* method, ArgArray* arg_array, JValue* result,
const char* shorty)
REQUIRES_SHARED(Locks::mutator_lock_) {
uint32_t* args = arg_array->GetArray();
if (UNLIKELY(soa.Env()->IsCheckJniEnabled())) {
CheckMethodArguments(soa.Vm(), method->GetInterfaceMethodIfProxy(kRuntimePointerSize), args);
}
method->Invoke(soa.Self(), args, arg_array->GetNumBytes(), result, shorty);
}
} // anonymous namespace
JValue InvokeWithVarArgs(const ScopedObjectAccessAlreadyRunnable& soa, jobject obj, jmethodID mid,
va_list args)
REQUIRES_SHARED(Locks::mutator_lock_) {
// We want to make sure that the stack is not within a small distance from the
// protected region in case we are calling into a leaf function whose stack
// check has been elided.
if (UNLIKELY(__builtin_frame_address(0) < soa.Self()->GetStackEnd())) {
ThrowStackOverflowError(soa.Self());
return JValue();
}
ArtMethod* method = jni::DecodeArtMethod(mid);
bool is_string_init = method->GetDeclaringClass()->IsStringClass() && method->IsConstructor();
if (is_string_init) {
// Replace calls to String.<init> with equivalent StringFactory call.
method = WellKnownClasses::StringInitToStringFactory(method);
}
ObjPtr<mirror::Object> receiver = method->IsStatic() ? nullptr : soa.Decode<mirror::Object>(obj);
uint32_t shorty_len = 0;
const char* shorty =
method->GetInterfaceMethodIfProxy(kRuntimePointerSize)->GetShorty(&shorty_len);
JValue result;
ArgArray arg_array(shorty, shorty_len);
arg_array.BuildArgArrayFromVarArgs(soa, receiver, args);
InvokeWithArgArray(soa, method, &arg_array, &result, shorty);
if (is_string_init) {
// For string init, remap original receiver to StringFactory result.
UpdateReference(soa.Self(), obj, result.GetL());
}
return result;
}
JValue InvokeWithJValues(const ScopedObjectAccessAlreadyRunnable& soa, jobject obj, jmethodID mid,
jvalue* args) {
// We want to make sure that the stack is not within a small distance from the
// protected region in case we are calling into a leaf function whose stack
// check has been elided.
if (UNLIKELY(__builtin_frame_address(0) < soa.Self()->GetStackEnd())) {
ThrowStackOverflowError(soa.Self());
return JValue();
}
ArtMethod* method = jni::DecodeArtMethod(mid);
bool is_string_init = method->GetDeclaringClass()->IsStringClass() && method->IsConstructor();
if (is_string_init) {
// Replace calls to String.<init> with equivalent StringFactory call.
method = WellKnownClasses::StringInitToStringFactory(method);
}
ObjPtr<mirror::Object> receiver = method->IsStatic() ? nullptr : soa.Decode<mirror::Object>(obj);
uint32_t shorty_len = 0;
const char* shorty =
method->GetInterfaceMethodIfProxy(kRuntimePointerSize)->GetShorty(&shorty_len);
JValue result;
ArgArray arg_array(shorty, shorty_len);
arg_array.BuildArgArrayFromJValues(soa, receiver, args);
InvokeWithArgArray(soa, method, &arg_array, &result, shorty);
if (is_string_init) {
// For string init, remap original receiver to StringFactory result.
UpdateReference(soa.Self(), obj, result.GetL());
}
return result;
}
JValue InvokeVirtualOrInterfaceWithJValues(const ScopedObjectAccessAlreadyRunnable& soa,
jobject obj, jmethodID mid, jvalue* args) {
// We want to make sure that the stack is not within a small distance from the
// protected region in case we are calling into a leaf function whose stack
// check has been elided.
if (UNLIKELY(__builtin_frame_address(0) < soa.Self()->GetStackEnd())) {
ThrowStackOverflowError(soa.Self());
return JValue();
}
ObjPtr<mirror::Object> receiver = soa.Decode<mirror::Object>(obj);
ArtMethod* method = FindVirtualMethod(receiver, jni::DecodeArtMethod(mid));
bool is_string_init = method->GetDeclaringClass()->IsStringClass() && method->IsConstructor();
if (is_string_init) {
// Replace calls to String.<init> with equivalent StringFactory call.
method = WellKnownClasses::StringInitToStringFactory(method);
receiver = nullptr;
}
uint32_t shorty_len = 0;
const char* shorty =
method->GetInterfaceMethodIfProxy(kRuntimePointerSize)->GetShorty(&shorty_len);
JValue result;
ArgArray arg_array(shorty, shorty_len);
arg_array.BuildArgArrayFromJValues(soa, receiver, args);
InvokeWithArgArray(soa, method, &arg_array, &result, shorty);
if (is_string_init) {
// For string init, remap original receiver to StringFactory result.
UpdateReference(soa.Self(), obj, result.GetL());
}
return result;
}
JValue InvokeVirtualOrInterfaceWithVarArgs(const ScopedObjectAccessAlreadyRunnable& soa,
jobject obj, jmethodID mid, va_list args) {
// We want to make sure that the stack is not within a small distance from the
// protected region in case we are calling into a leaf function whose stack
// check has been elided.
if (UNLIKELY(__builtin_frame_address(0) < soa.Self()->GetStackEnd())) {
ThrowStackOverflowError(soa.Self());
return JValue();
}
ObjPtr<mirror::Object> receiver = soa.Decode<mirror::Object>(obj);
ArtMethod* method = FindVirtualMethod(receiver, jni::DecodeArtMethod(mid));
bool is_string_init = method->GetDeclaringClass()->IsStringClass() && method->IsConstructor();
if (is_string_init) {
// Replace calls to String.<init> with equivalent StringFactory call.
method = WellKnownClasses::StringInitToStringFactory(method);
receiver = nullptr;
}
uint32_t shorty_len = 0;
const char* shorty =
method->GetInterfaceMethodIfProxy(kRuntimePointerSize)->GetShorty(&shorty_len);
JValue result;
ArgArray arg_array(shorty, shorty_len);
arg_array.BuildArgArrayFromVarArgs(soa, receiver, args);
InvokeWithArgArray(soa, method, &arg_array, &result, shorty);
if (is_string_init) {
// For string init, remap original receiver to StringFactory result.
UpdateReference(soa.Self(), obj, result.GetL());
}
return result;
}
jobject InvokeMethod(const ScopedObjectAccessAlreadyRunnable& soa, jobject javaMethod,
jobject javaReceiver, jobject javaArgs, size_t num_frames) {
// We want to make sure that the stack is not within a small distance from the
// protected region in case we are calling into a leaf function whose stack
// check has been elided.
if (UNLIKELY(__builtin_frame_address(0) <
soa.Self()->GetStackEndForInterpreter(true))) {
ThrowStackOverflowError(soa.Self());
return nullptr;
}
ObjPtr<mirror::Executable> executable = soa.Decode<mirror::Executable>(javaMethod);
const bool accessible = executable->IsAccessible();
ArtMethod* m = executable->GetArtMethod();
ObjPtr<mirror::Class> declaring_class = m->GetDeclaringClass();
if (UNLIKELY(!declaring_class->IsInitialized())) {
StackHandleScope<1> hs(soa.Self());
HandleWrapperObjPtr<mirror::Class> h_class(hs.NewHandleWrapper(&declaring_class));
if (!Runtime::Current()->GetClassLinker()->EnsureInitialized(soa.Self(), h_class, true, true)) {
return nullptr;
}
}
ObjPtr<mirror::Object> receiver;
if (!m->IsStatic()) {
// Replace calls to String.<init> with equivalent StringFactory call.
if (declaring_class->IsStringClass() && m->IsConstructor()) {
m = WellKnownClasses::StringInitToStringFactory(m);
CHECK(javaReceiver == nullptr);
} else {
// Check that the receiver is non-null and an instance of the field's declaring class.
receiver = soa.Decode<mirror::Object>(javaReceiver);
if (!VerifyObjectIsClass(receiver, declaring_class)) {
return nullptr;
}
// Find the actual implementation of the virtual method.
m = receiver->GetClass()->FindVirtualMethodForVirtualOrInterface(m, kRuntimePointerSize);
}
}
// Get our arrays of arguments and their types, and check they're the same size.
ObjPtr<mirror::ObjectArray<mirror::Object>> objects =
soa.Decode<mirror::ObjectArray<mirror::Object>>(javaArgs);
auto* np_method = m->GetInterfaceMethodIfProxy(kRuntimePointerSize);
const DexFile::TypeList* classes = np_method->GetParameterTypeList();
uint32_t classes_size = (classes == nullptr) ? 0 : classes->Size();
uint32_t arg_count = (objects != nullptr) ? objects->GetLength() : 0;
if (arg_count != classes_size) {
ThrowIllegalArgumentException(StringPrintf("Wrong number of arguments; expected %d, got %d",
classes_size, arg_count).c_str());
return nullptr;
}
// If method is not set to be accessible, verify it can be accessed by the caller.
ObjPtr<mirror::Class> calling_class;
if (!accessible && !VerifyAccess(soa.Self(),
receiver,
declaring_class,
m->GetAccessFlags(),
&calling_class,
num_frames)) {
ThrowIllegalAccessException(
StringPrintf("Class %s cannot access %s method %s of class %s",
calling_class == nullptr ? "null" : calling_class->PrettyClass().c_str(),
PrettyJavaAccessFlags(m->GetAccessFlags()).c_str(),
m->PrettyMethod().c_str(),
m->GetDeclaringClass() == nullptr ? "null" :
m->GetDeclaringClass()->PrettyClass().c_str()).c_str());
return nullptr;
}
// Invoke the method.
JValue result;
uint32_t shorty_len = 0;
const char* shorty = np_method->GetShorty(&shorty_len);
ArgArray arg_array(shorty, shorty_len);
if (!arg_array.BuildArgArrayFromObjectArray(receiver, objects, np_method, soa.Self())) {
CHECK(soa.Self()->IsExceptionPending());
return nullptr;
}
InvokeWithArgArray(soa, m, &arg_array, &result, shorty);
// Wrap any exception with "Ljava/lang/reflect/InvocationTargetException;" and return early.
if (soa.Self()->IsExceptionPending()) {
// If we get another exception when we are trying to wrap, then just use that instead.
ScopedLocalRef<jthrowable> th(soa.Env(), soa.Env()->ExceptionOccurred());
soa.Self()->ClearException();
jclass exception_class = soa.Env()->FindClass("java/lang/reflect/InvocationTargetException");
if (exception_class == nullptr) {
soa.Self()->AssertPendingException();
return nullptr;
}
jmethodID mid = soa.Env()->GetMethodID(exception_class, "<init>", "(Ljava/lang/Throwable;)V");
CHECK(mid != nullptr);
jobject exception_instance = soa.Env()->NewObject(exception_class, mid, th.get());
if (exception_instance == nullptr) {
soa.Self()->AssertPendingException();
return nullptr;
}
soa.Env()->Throw(reinterpret_cast<jthrowable>(exception_instance));
return nullptr;
}
// Box if necessary and return.
return soa.AddLocalReference<jobject>(BoxPrimitive(Primitive::GetType(shorty[0]), result));
}
ObjPtr<mirror::Object> BoxPrimitive(Primitive::Type src_class, const JValue& value) {
if (src_class == Primitive::kPrimNot) {
return MakeObjPtr(value.GetL());
}
if (src_class == Primitive::kPrimVoid) {
// There's no such thing as a void field, and void methods invoked via reflection return null.
return nullptr;
}
jmethodID m = nullptr;
const char* shorty;
switch (src_class) {
case Primitive::kPrimBoolean:
m = WellKnownClasses::java_lang_Boolean_valueOf;
shorty = "LZ";
break;
case Primitive::kPrimByte:
m = WellKnownClasses::java_lang_Byte_valueOf;
shorty = "LB";
break;
case Primitive::kPrimChar:
m = WellKnownClasses::java_lang_Character_valueOf;
shorty = "LC";
break;
case Primitive::kPrimDouble:
m = WellKnownClasses::java_lang_Double_valueOf;
shorty = "LD";
break;
case Primitive::kPrimFloat:
m = WellKnownClasses::java_lang_Float_valueOf;
shorty = "LF";
break;
case Primitive::kPrimInt:
m = WellKnownClasses::java_lang_Integer_valueOf;
shorty = "LI";
break;
case Primitive::kPrimLong:
m = WellKnownClasses::java_lang_Long_valueOf;
shorty = "LJ";
break;
case Primitive::kPrimShort:
m = WellKnownClasses::java_lang_Short_valueOf;
shorty = "LS";
break;
default:
LOG(FATAL) << static_cast<int>(src_class);
shorty = nullptr;
}
ScopedObjectAccessUnchecked soa(Thread::Current());
DCHECK_EQ(soa.Self()->GetState(), kRunnable);
ArgArray arg_array(shorty, 2);
JValue result;
if (src_class == Primitive::kPrimDouble || src_class == Primitive::kPrimLong) {
arg_array.AppendWide(value.GetJ());
} else {
arg_array.Append(value.GetI());
}
jni::DecodeArtMethod(m)->Invoke(soa.Self(),
arg_array.GetArray(),
arg_array.GetNumBytes(),
&result,
shorty);
return result.GetL();
}
static std::string UnboxingFailureKind(ArtField* f)
REQUIRES_SHARED(Locks::mutator_lock_) {
if (f != nullptr) {
return "field " + f->PrettyField(false);
}
return "result";
}
static bool UnboxPrimitive(ObjPtr<mirror::Object> o,
ObjPtr<mirror::Class> dst_class,
ArtField* f,
JValue* unboxed_value)
REQUIRES_SHARED(Locks::mutator_lock_) {
bool unbox_for_result = (f == nullptr);
if (!dst_class->IsPrimitive()) {
if (UNLIKELY(o != nullptr && !o->InstanceOf(dst_class))) {
if (!unbox_for_result) {
ThrowIllegalArgumentException(
StringPrintf("%s has type %s, got %s",
UnboxingFailureKind(f).c_str(),
dst_class->PrettyDescriptor().c_str(),
o->PrettyTypeOf().c_str()).c_str());
} else {
ThrowClassCastException(
StringPrintf("Couldn't convert result of type %s to %s",
o->PrettyTypeOf().c_str(),
dst_class->PrettyDescriptor().c_str()).c_str());
}
return false;
}
unboxed_value->SetL(o);
return true;
}
if (UNLIKELY(dst_class->GetPrimitiveType() == Primitive::kPrimVoid)) {
ThrowIllegalArgumentException(StringPrintf("Can't unbox %s to void",
UnboxingFailureKind(f).c_str()).c_str());
return false;
}
if (UNLIKELY(o == nullptr)) {
if (!unbox_for_result) {
ThrowIllegalArgumentException(
StringPrintf("%s has type %s, got null",
UnboxingFailureKind(f).c_str(),
dst_class->PrettyDescriptor().c_str()).c_str());
} else {
ThrowNullPointerException(
StringPrintf("Expected to unbox a '%s' primitive type but was returned null",
dst_class->PrettyDescriptor().c_str()).c_str());
}
return false;
}
JValue boxed_value;
ObjPtr<mirror::Class> klass = o->GetClass();
ObjPtr<mirror::Class> src_class = nullptr;
ClassLinker* const class_linker = Runtime::Current()->GetClassLinker();
ArtField* primitive_field = &klass->GetIFieldsPtr()->At(0);
if (klass->DescriptorEquals("Ljava/lang/Boolean;")) {
src_class = class_linker->FindPrimitiveClass('Z');
boxed_value.SetZ(primitive_field->GetBoolean(o));
} else if (klass->DescriptorEquals("Ljava/lang/Byte;")) {
src_class = class_linker->FindPrimitiveClass('B');
boxed_value.SetB(primitive_field->GetByte(o));
} else if (klass->DescriptorEquals("Ljava/lang/Character;")) {
src_class = class_linker->FindPrimitiveClass('C');
boxed_value.SetC(primitive_field->GetChar(o));
} else if (klass->DescriptorEquals("Ljava/lang/Float;")) {
src_class = class_linker->FindPrimitiveClass('F');
boxed_value.SetF(primitive_field->GetFloat(o));
} else if (klass->DescriptorEquals("Ljava/lang/Double;")) {
src_class = class_linker->FindPrimitiveClass('D');
boxed_value.SetD(primitive_field->GetDouble(o));
} else if (klass->DescriptorEquals("Ljava/lang/Integer;")) {
src_class = class_linker->FindPrimitiveClass('I');
boxed_value.SetI(primitive_field->GetInt(o));
} else if (klass->DescriptorEquals("Ljava/lang/Long;")) {
src_class = class_linker->FindPrimitiveClass('J');
boxed_value.SetJ(primitive_field->GetLong(o));
} else if (klass->DescriptorEquals("Ljava/lang/Short;")) {
src_class = class_linker->FindPrimitiveClass('S');
boxed_value.SetS(primitive_field->GetShort(o));
} else {
std::string temp;
ThrowIllegalArgumentException(
StringPrintf("%s has type %s, got %s", UnboxingFailureKind(f).c_str(),
dst_class->PrettyDescriptor().c_str(),
PrettyDescriptor(o->GetClass()->GetDescriptor(&temp)).c_str()).c_str());
return false;
}
return ConvertPrimitiveValue(unbox_for_result,
src_class->GetPrimitiveType(), dst_class->GetPrimitiveType(),
boxed_value, unboxed_value);
}
bool UnboxPrimitiveForField(ObjPtr<mirror::Object> o,
ObjPtr<mirror::Class> dst_class,
ArtField* f,
JValue* unboxed_value) {
DCHECK(f != nullptr);
return UnboxPrimitive(o, dst_class, f, unboxed_value);
}
bool UnboxPrimitiveForResult(ObjPtr<mirror::Object> o,
ObjPtr<mirror::Class> dst_class,
JValue* unboxed_value) {
return UnboxPrimitive(o, dst_class, nullptr, unboxed_value);
}
ObjPtr<mirror::Class> GetCallingClass(Thread* self, size_t num_frames) {
NthCallerVisitor visitor(self, num_frames);
visitor.WalkStack();
return visitor.caller != nullptr ? visitor.caller->GetDeclaringClass() : nullptr;
}
bool VerifyAccess(Thread* self,
ObjPtr<mirror::Object> obj,
ObjPtr<mirror::Class> declaring_class,
uint32_t access_flags,
ObjPtr<mirror::Class>* calling_class,
size_t num_frames) {
if ((access_flags & kAccPublic) != 0) {
return true;
}
ObjPtr<mirror::Class> klass = GetCallingClass(self, num_frames);
if (UNLIKELY(klass == nullptr)) {
// The caller is an attached native thread.
return false;
}
*calling_class = klass;
return VerifyAccess(obj, declaring_class, access_flags, klass);
}
bool VerifyAccess(ObjPtr<mirror::Object> obj,
ObjPtr<mirror::Class> declaring_class,
uint32_t access_flags,
ObjPtr<mirror::Class> calling_class) {
if (calling_class == declaring_class) {
return true;
}
ScopedAssertNoThreadSuspension sants("verify-access");
if ((access_flags & kAccPrivate) != 0) {
return false;
}
if ((access_flags & kAccProtected) != 0) {
if (obj != nullptr && !obj->InstanceOf(calling_class) &&
!declaring_class->IsInSamePackage(calling_class)) {
return false;
} else if (declaring_class->IsAssignableFrom(calling_class)) {
return true;
}
}
return declaring_class->IsInSamePackage(calling_class);
}
void InvalidReceiverError(ObjPtr<mirror::Object> o, ObjPtr<mirror::Class> c) {
std::string expected_class_name(mirror::Class::PrettyDescriptor(c));
std::string actual_class_name(mirror::Object::PrettyTypeOf(o));
ThrowIllegalArgumentException(StringPrintf("Expected receiver of type %s, but got %s",
expected_class_name.c_str(),
actual_class_name.c_str()).c_str());
}
// This only works if there's one reference which points to the object in obj.
// Will need to be fixed if there's cases where it's not.
void UpdateReference(Thread* self, jobject obj, ObjPtr<mirror::Object> result) {
IndirectRef ref = reinterpret_cast<IndirectRef>(obj);
IndirectRefKind kind = IndirectReferenceTable::GetIndirectRefKind(ref);
if (kind == kLocal) {
self->GetJniEnv()->UpdateLocal(obj, result);
} else if (kind == kHandleScopeOrInvalid) {
LOG(FATAL) << "Unsupported UpdateReference for kind kHandleScopeOrInvalid";
} else if (kind == kGlobal) {
self->GetJniEnv()->GetVm()->UpdateGlobal(self, ref, result);
} else {
DCHECK_EQ(kind, kWeakGlobal);
self->GetJniEnv()->GetVm()->UpdateWeakGlobal(self, ref, result);
}
}
} // namespace art