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/*
* Copyright (C) 2012 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 "runtime_support.h"
namespace art {
void ThrowNewIllegalAccessErrorClass(Thread* self,
Class* referrer,
Class* accessed) {
self->ThrowNewExceptionF("Ljava/lang/IllegalAccessError;",
"illegal class access: '%s' -> '%s'",
PrettyDescriptor(referrer).c_str(),
PrettyDescriptor(accessed).c_str());
}
void ThrowNewIllegalAccessErrorClassForMethodDispatch(Thread* self,
Class* referrer,
Class* accessed,
const Method* caller,
const Method* called,
InvokeType type) {
std::ostringstream type_stream;
type_stream << type;
self->ThrowNewExceptionF("Ljava/lang/IllegalAccessError;",
"illegal class access ('%s' -> '%s')"
"in attempt to invoke %s method '%s' from '%s'",
PrettyDescriptor(referrer).c_str(),
PrettyDescriptor(accessed).c_str(),
type_stream.str().c_str(),
PrettyMethod(called).c_str(),
PrettyMethod(caller).c_str());
}
void ThrowNewIncompatibleClassChangeErrorClassForInterfaceDispatch(Thread* self,
const Method* referrer,
const Method* interface_method,
Object* this_object) {
self->ThrowNewExceptionF("Ljava/lang/IncompatibleClassChangeError;",
"class '%s' does not implement interface '%s' in call to '%s' from '%s'",
PrettyDescriptor(this_object->GetClass()).c_str(),
PrettyDescriptor(interface_method->GetDeclaringClass()).c_str(),
PrettyMethod(interface_method).c_str(), PrettyMethod(referrer).c_str());
}
void ThrowNewIllegalAccessErrorField(Thread* self,
Class* referrer,
Field* accessed) {
self->ThrowNewExceptionF("Ljava/lang/IllegalAccessError;",
"Field '%s' is inaccessible to class '%s'",
PrettyField(accessed, false).c_str(),
PrettyDescriptor(referrer).c_str());
}
void ThrowNewIllegalAccessErrorFinalField(Thread* self,
const Method* referrer,
Field* accessed) {
self->ThrowNewExceptionF("Ljava/lang/IllegalAccessError;",
"Final field '%s' cannot be written to by method '%s'",
PrettyField(accessed, false).c_str(),
PrettyMethod(referrer).c_str());
}
void ThrowNewIllegalAccessErrorMethod(Thread* self,
Class* referrer,
Method* accessed) {
self->ThrowNewExceptionF("Ljava/lang/IllegalAccessError;",
"Method '%s' is inaccessible to class '%s'",
PrettyMethod(accessed).c_str(),
PrettyDescriptor(referrer).c_str());
}
void ThrowNullPointerExceptionForFieldAccess(Thread* self,
Field* field,
bool is_read) {
self->ThrowNewExceptionF("Ljava/lang/NullPointerException;",
"Attempt to %s field '%s' on a null object reference",
is_read ? "read from" : "write to",
PrettyField(field, true).c_str());
}
void ThrowNullPointerExceptionForMethodAccess(Thread* self,
Method* caller,
uint32_t method_idx,
InvokeType type) {
const DexFile& dex_file =
Runtime::Current()->GetClassLinker()->FindDexFile(caller->GetDeclaringClass()->GetDexCache());
std::ostringstream type_stream;
type_stream << type;
self->ThrowNewExceptionF("Ljava/lang/NullPointerException;",
"Attempt to invoke %s method '%s' on a null object reference",
type_stream.str().c_str(),
PrettyMethod(method_idx, dex_file, true).c_str());
}
void ThrowNullPointerExceptionFromDexPC(Thread* self, Method* throw_method, uint32_t dex_pc) {
const DexFile::CodeItem* code = MethodHelper(throw_method).GetCodeItem();
CHECK_LT(dex_pc, code->insns_size_in_code_units_);
const Instruction* instr = Instruction::At(&code->insns_[dex_pc]);
DecodedInstruction dec_insn(instr);
switch (instr->Opcode()) {
case Instruction::INVOKE_DIRECT:
case Instruction::INVOKE_DIRECT_RANGE:
ThrowNullPointerExceptionForMethodAccess(self, throw_method, dec_insn.vB, kDirect);
break;
case Instruction::INVOKE_VIRTUAL:
case Instruction::INVOKE_VIRTUAL_RANGE:
ThrowNullPointerExceptionForMethodAccess(self, throw_method, dec_insn.vB, kVirtual);
break;
case Instruction::IGET:
case Instruction::IGET_WIDE:
case Instruction::IGET_OBJECT:
case Instruction::IGET_BOOLEAN:
case Instruction::IGET_BYTE:
case Instruction::IGET_CHAR:
case Instruction::IGET_SHORT: {
Field* field =
Runtime::Current()->GetClassLinker()->ResolveField(dec_insn.vC, throw_method, false);
ThrowNullPointerExceptionForFieldAccess(self, field, true /* read */);
break;
}
case Instruction::IPUT:
case Instruction::IPUT_WIDE:
case Instruction::IPUT_OBJECT:
case Instruction::IPUT_BOOLEAN:
case Instruction::IPUT_BYTE:
case Instruction::IPUT_CHAR:
case Instruction::IPUT_SHORT: {
Field* field =
Runtime::Current()->GetClassLinker()->ResolveField(dec_insn.vC, throw_method, false);
ThrowNullPointerExceptionForFieldAccess(self, field, false /* write */);
break;
}
case Instruction::AGET:
case Instruction::AGET_WIDE:
case Instruction::AGET_OBJECT:
case Instruction::AGET_BOOLEAN:
case Instruction::AGET_BYTE:
case Instruction::AGET_CHAR:
case Instruction::AGET_SHORT:
self->ThrowNewException("Ljava/lang/NullPointerException;",
"Attempt to read from null array");
break;
case Instruction::APUT:
case Instruction::APUT_WIDE:
case Instruction::APUT_OBJECT:
case Instruction::APUT_BOOLEAN:
case Instruction::APUT_BYTE:
case Instruction::APUT_CHAR:
case Instruction::APUT_SHORT:
self->ThrowNewException("Ljava/lang/NullPointerException;",
"Attempt to write to null array");
break;
default: {
const DexFile& dex_file = Runtime::Current()->GetClassLinker()
->FindDexFile(throw_method->GetDeclaringClass()->GetDexCache());
std::string message("Null pointer exception during instruction '");
message += instr->DumpString(&dex_file);
message += "'";
self->ThrowNewException("Ljava/lang/NullPointerException;", message.c_str());
break;
}
}
}
std::string FieldNameFromIndex(const Method* method, uint32_t ref,
verifier::VerifyErrorRefType ref_type, bool access) {
CHECK_EQ(static_cast<int>(ref_type), static_cast<int>(verifier::VERIFY_ERROR_REF_FIELD));
ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
const DexFile& dex_file = class_linker->FindDexFile(method->GetDeclaringClass()->GetDexCache());
const DexFile::FieldId& id = dex_file.GetFieldId(ref);
std::string class_name(PrettyDescriptor(dex_file.GetFieldDeclaringClassDescriptor(id)));
const char* field_name = dex_file.StringDataByIdx(id.name_idx_);
if (!access) {
return class_name + "." + field_name;
}
std::string result;
result += "tried to access field ";
result += class_name + "." + field_name;
result += " from class ";
result += PrettyDescriptor(method->GetDeclaringClass());
return result;
}
std::string MethodNameFromIndex(const Method* method, uint32_t ref,
verifier::VerifyErrorRefType ref_type, bool access) {
CHECK_EQ(static_cast<int>(ref_type), static_cast<int>(verifier::VERIFY_ERROR_REF_METHOD));
ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
const DexFile& dex_file = class_linker->FindDexFile(method->GetDeclaringClass()->GetDexCache());
const DexFile::MethodId& id = dex_file.GetMethodId(ref);
std::string class_name(PrettyDescriptor(dex_file.GetMethodDeclaringClassDescriptor(id)));
const char* method_name = dex_file.StringDataByIdx(id.name_idx_);
if (!access) {
return class_name + "." + method_name;
}
std::string result;
result += "tried to access method ";
result += class_name + "." + method_name + ":" +
dex_file.CreateMethodSignature(id.proto_idx_, NULL);
result += " from class ";
result += PrettyDescriptor(method->GetDeclaringClass());
return result;
}
// Helper function to allocate array for FILLED_NEW_ARRAY.
Array* CheckAndAllocArrayFromCode(uint32_t type_idx, Method* method, int32_t component_count,
Thread* self, bool access_check) {
if (UNLIKELY(component_count < 0)) {
self->ThrowNewExceptionF("Ljava/lang/NegativeArraySizeException;", "%d", component_count);
return NULL; // Failure
}
Class* klass = method->GetDexCacheResolvedTypes()->Get(type_idx);
if (UNLIKELY(klass == NULL)) { // Not in dex cache so try to resolve
klass = Runtime::Current()->GetClassLinker()->ResolveType(type_idx, method);
if (klass == NULL) { // Error
DCHECK(Thread::Current()->IsExceptionPending());
return NULL; // Failure
}
}
if (UNLIKELY(klass->IsPrimitive() && !klass->IsPrimitiveInt())) {
if (klass->IsPrimitiveLong() || klass->IsPrimitiveDouble()) {
Thread::Current()->ThrowNewExceptionF("Ljava/lang/RuntimeException;",
"Bad filled array request for type %s",
PrettyDescriptor(klass).c_str());
} else {
Thread::Current()->ThrowNewExceptionF("Ljava/lang/InternalError;",
"Found type %s; filled-new-array not implemented for anything but \'int\'",
PrettyDescriptor(klass).c_str());
}
return NULL; // Failure
} else {
if (access_check) {
Class* referrer = method->GetDeclaringClass();
if (UNLIKELY(!referrer->CanAccess(klass))) {
ThrowNewIllegalAccessErrorClass(self, referrer, klass);
return NULL; // Failure
}
}
DCHECK(klass->IsArrayClass()) << PrettyClass(klass);
return Array::Alloc(klass, component_count);
}
}
// Slow path field resolution and declaring class initialization
Field* FindFieldFromCode(uint32_t field_idx, const Method* referrer, Thread* self,
bool is_static, bool is_primitive, bool is_set, size_t expected_size) {
ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
Field* resolved_field = class_linker->ResolveField(field_idx, referrer, is_static);
if (UNLIKELY(resolved_field == NULL)) {
DCHECK(self->IsExceptionPending()); // Throw exception and unwind
return NULL; // failure
} else {
Class* fields_class = resolved_field->GetDeclaringClass();
Class* referring_class = referrer->GetDeclaringClass();
if (UNLIKELY(!referring_class->CanAccess(fields_class))) {
ThrowNewIllegalAccessErrorClass(self, referring_class, fields_class);
return NULL; // failure
} else if (UNLIKELY(!referring_class->CanAccessMember(fields_class,
resolved_field->GetAccessFlags()))) {
ThrowNewIllegalAccessErrorField(self, referring_class, resolved_field);
return NULL; // failure
} else if (UNLIKELY(is_set && resolved_field->IsFinal() && (fields_class != referring_class))) {
ThrowNewIllegalAccessErrorFinalField(self, referrer, resolved_field);
return NULL; // failure
} else {
FieldHelper fh(resolved_field);
if (UNLIKELY(fh.IsPrimitiveType() != is_primitive ||
fh.FieldSize() != expected_size)) {
self->ThrowNewExceptionF("Ljava/lang/NoSuchFieldError;",
"Attempted read of %zd-bit %s on field '%s'",
expected_size * (32 / sizeof(int32_t)),
is_primitive ? "primitive" : "non-primitive",
PrettyField(resolved_field, true).c_str());
return NULL; // failure
} else if (!is_static) {
// instance fields must be being accessed on an initialized class
return resolved_field;
} else {
// If the class is already initializing, we must be inside <clinit>, or
// we'd still be waiting for the lock.
if (fields_class->IsInitializing()) {
return resolved_field;
} else if (Runtime::Current()->GetClassLinker()->EnsureInitialized(fields_class, true, true)) {
return resolved_field;
} else {
DCHECK(self->IsExceptionPending()); // Throw exception and unwind
return NULL; // failure
}
}
}
}
}
// Slow path method resolution
Method* FindMethodFromCode(uint32_t method_idx, Object* this_object, const Method* referrer,
Thread* self, bool access_check, InvokeType type) {
ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
bool is_direct = type == kStatic || type == kDirect;
Method* resolved_method = class_linker->ResolveMethod(method_idx, referrer, is_direct);
if (UNLIKELY(resolved_method == NULL)) {
DCHECK(self->IsExceptionPending()); // Throw exception and unwind
return NULL; // failure
} else {
if (!access_check) {
if (is_direct) {
return resolved_method;
} else if (type == kInterface) {
Method* interface_method =
this_object->GetClass()->FindVirtualMethodForInterface(resolved_method);
if (UNLIKELY(interface_method == NULL)) {
ThrowNewIncompatibleClassChangeErrorClassForInterfaceDispatch(self, referrer,
resolved_method,
this_object);
return NULL; // failure
} else {
return interface_method;
}
} else {
ObjectArray<Method>* vtable;
uint16_t vtable_index = resolved_method->GetMethodIndex();
if (type == kSuper) {
vtable = referrer->GetDeclaringClass()->GetSuperClass()->GetVTable();
} else {
vtable = this_object->GetClass()->GetVTable();
}
// TODO: eliminate bounds check?
return vtable->Get(vtable_index);
}
} else {
Class* methods_class = resolved_method->GetDeclaringClass();
Class* referring_class = referrer->GetDeclaringClass();
if (UNLIKELY(!referring_class->CanAccess(methods_class) ||
!referring_class->CanAccessMember(methods_class,
resolved_method->GetAccessFlags()))) {
// The referring class can't access the resolved method, this may occur as a result of a
// protected method being made public by implementing an interface that re-declares the
// method public. Resort to the dex file to determine the correct class for the access check
const DexFile& dex_file = class_linker->FindDexFile(referring_class->GetDexCache());
methods_class = class_linker->ResolveType(dex_file,
dex_file.GetMethodId(method_idx).class_idx_,
referring_class);
if (UNLIKELY(!referring_class->CanAccess(methods_class))) {
ThrowNewIllegalAccessErrorClassForMethodDispatch(self, referring_class, methods_class,
referrer, resolved_method, type);
return NULL; // failure
} else if (UNLIKELY(!referring_class->CanAccessMember(methods_class,
resolved_method->GetAccessFlags()))) {
ThrowNewIllegalAccessErrorMethod(self, referring_class, resolved_method);
return NULL; // failure
}
}
if (is_direct) {
return resolved_method;
} else if (type == kInterface) {
Method* interface_method =
this_object->GetClass()->FindVirtualMethodForInterface(resolved_method);
if (UNLIKELY(interface_method == NULL)) {
ThrowNewIncompatibleClassChangeErrorClassForInterfaceDispatch(self, referrer,
resolved_method,
this_object);
return NULL; // failure
} else {
return interface_method;
}
} else {
ObjectArray<Method>* vtable;
uint16_t vtable_index = resolved_method->GetMethodIndex();
if (type == kSuper) {
Class* super_class = referring_class->GetSuperClass();
if (LIKELY(super_class != NULL)) {
vtable = referring_class->GetSuperClass()->GetVTable();
} else {
vtable = NULL;
}
} else {
vtable = this_object->GetClass()->GetVTable();
}
if (LIKELY(vtable != NULL &&
vtable_index < static_cast<uint32_t>(vtable->GetLength()))) {
return vtable->GetWithoutChecks(vtable_index);
} else {
// Behavior to agree with that of the verifier
self->ThrowNewExceptionF("Ljava/lang/NoSuchMethodError;",
"attempt to invoke %s method '%s' from '%s'"
" using incorrect form of method dispatch",
(type == kSuper ? "super class" : "virtual"),
PrettyMethod(resolved_method).c_str(),
PrettyMethod(referrer).c_str());
return NULL; // failure
}
}
}
}
}
Class* ResolveVerifyAndClinit(uint32_t type_idx, const Method* referrer, Thread* self,
bool can_run_clinit, bool verify_access) {
ClassLinker* class_linker = Runtime::Current()->GetClassLinker();
Class* klass = class_linker->ResolveType(type_idx, referrer);
if (UNLIKELY(klass == NULL)) {
CHECK(self->IsExceptionPending());
return NULL; // Failure - Indicate to caller to deliver exception
}
// Perform access check if necessary.
Class* referring_class = referrer->GetDeclaringClass();
if (verify_access && UNLIKELY(!referring_class->CanAccess(klass))) {
ThrowNewIllegalAccessErrorClass(self, referring_class, klass);
return NULL; // Failure - Indicate to caller to deliver exception
}
// If we're just implementing const-class, we shouldn't call <clinit>.
if (!can_run_clinit) {
return klass;
}
// If we are the <clinit> of this class, just return our storage.
//
// Do not set the DexCache InitializedStaticStorage, since that implies <clinit> has finished
// running.
if (klass == referring_class && MethodHelper(referrer).IsClassInitializer()) {
return klass;
}
if (!class_linker->EnsureInitialized(klass, true, true)) {
CHECK(self->IsExceptionPending());
return NULL; // Failure - Indicate to caller to deliver exception
}
referrer->GetDexCacheInitializedStaticStorage()->Set(type_idx, klass);
return klass;
}
} // namespace art