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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 "common_throws.h"
#include "base/logging.h"
#include "dex_instruction.h"
#include "invoke_type.h"
#include "object_utils.h"
#include "thread.h"
#include <sstream>
namespace art {
static void AddReferrerLocation(std::ostream& os, const AbstractMethod* referrer)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
if (referrer != NULL) {
ClassHelper kh(referrer->GetDeclaringClass());
std::string location(kh.GetLocation());
if (!location.empty()) {
os << " (accessed from " << location << ")";
}
}
}
static void AddReferrerLocationFromClass(std::ostream& os, Class* referrer)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
if (referrer != NULL) {
ClassHelper kh(referrer);
std::string location(kh.GetLocation());
if (!location.empty()) {
os << " (declaration of '" << PrettyDescriptor(referrer)
<< "' appears in " << location << ")";
}
}
}
// NullPointerException
void ThrowNullPointerExceptionForFieldAccess(Field* field, bool is_read) {
std::ostringstream msg;
msg << "Attempt to " << (is_read ? "read from" : "write to")
<< " field '" << PrettyField(field, true) << "' on a null object reference";
Thread::Current()->ThrowNewException("Ljava/lang/NullPointerException;", msg.str().c_str());
}
void ThrowNullPointerExceptionForMethodAccess(AbstractMethod* caller, uint32_t method_idx,
InvokeType type) {
DexCache* dex_cache = caller->GetDeclaringClass()->GetDexCache();
const DexFile& dex_file = *dex_cache->GetDexFile();
std::ostringstream msg;
msg << "Attempt to invoke " << type << " method '"
<< PrettyMethod(method_idx, dex_file, true) << "' on a null object reference";
Thread::Current()->ThrowNewException("Ljava/lang/NullPointerException;", msg.str().c_str());
}
void ThrowNullPointerExceptionFromDexPC(AbstractMethod* 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(throw_method, dec_insn.vB, kDirect);
break;
case Instruction::INVOKE_VIRTUAL:
case Instruction::INVOKE_VIRTUAL_RANGE:
ThrowNullPointerExceptionForMethodAccess(throw_method, dec_insn.vB, kVirtual);
break;
case Instruction::INVOKE_INTERFACE:
case Instruction::INVOKE_INTERFACE_RANGE:
ThrowNullPointerExceptionForMethodAccess(throw_method, dec_insn.vB, kInterface);
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(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(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:
Thread::Current()->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:
Thread::Current()->ThrowNewException("Ljava/lang/NullPointerException;",
"Attempt to write to null array");
break;
case Instruction::ARRAY_LENGTH:
Thread::Current()->ThrowNewException("Ljava/lang/NullPointerException;",
"Attempt to get length of null array");
break;
default: {
// TODO: We should have covered all the cases where we expect a NPE above, this
// message/logging is so we can improve any cases we've missed in the future.
const DexFile& dex_file = *throw_method->GetDeclaringClass()->GetDexCache()->GetDexFile();
std::string message("Null pointer exception during instruction '");
message += instr->DumpString(&dex_file);
message += "'";
Thread::Current()->ThrowNewException("Ljava/lang/NullPointerException;", message.c_str());
break;
}
}
}
// IllegalAccessError
void ThrowIllegalAccessErrorClass(Class* referrer, Class* accessed) {
std::ostringstream msg;
msg << "Illegal class access: '" << PrettyDescriptor(referrer) << "' attempting to access '"
<< PrettyDescriptor(accessed) << "'";
AddReferrerLocationFromClass(msg, referrer);
Thread::Current()->ThrowNewException("Ljava/lang/IllegalAccessError;", msg.str().c_str());
}
void ThrowIllegalAccessErrorClassForMethodDispatch(Class* referrer, Class* accessed,
const AbstractMethod* caller,
const AbstractMethod* called,
InvokeType type) {
std::ostringstream msg;
msg << "Illegal class access ('" << PrettyDescriptor(referrer) << "' attempting to access '"
<< PrettyDescriptor(accessed) << "') in attempt to invoke " << type
<< " method " << PrettyMethod(called).c_str();
AddReferrerLocation(msg, caller);
Thread::Current()->ThrowNewException("Ljava/lang/IllegalAccessError;", msg.str().c_str());
}
void ThrowIllegalAccessErrorMethod(Class* referrer, AbstractMethod* accessed) {
std::ostringstream msg;
msg << "Method '" << PrettyMethod(accessed) << "' is inaccessible to class '"
<< PrettyDescriptor(referrer) << "'";
AddReferrerLocationFromClass(msg, referrer);
Thread::Current()->ThrowNewException("Ljava/lang/IllegalAccessError;", msg.str().c_str());
}
void ThrowIllegalAccessErrorField(Class* referrer, Field* accessed) {
std::ostringstream msg;
msg << "Field '" << PrettyField(accessed, false) << "' is inaccessible to class '"
<< PrettyDescriptor(referrer) << "'";
AddReferrerLocationFromClass(msg, referrer);
Thread::Current()->ThrowNewException("Ljava/lang/IllegalAccessError;", msg.str().c_str());
}
void ThrowIllegalAccessErrorFinalField(const AbstractMethod* referrer, Field* accessed) {
std::ostringstream msg;
msg << "Final field '" << PrettyField(accessed, false) << "' cannot be written to by method '"
<< PrettyMethod(referrer) << "'";
AddReferrerLocation(msg, referrer);
Thread::Current()->ThrowNewException("Ljava/lang/IllegalAccessError;", msg.str().c_str());
}
// IncompatibleClassChangeError
void ThrowIncompatibleClassChangeError(InvokeType expected_type, InvokeType found_type,
AbstractMethod* method, const AbstractMethod* referrer) {
std::ostringstream msg;
msg << "The method '" << PrettyMethod(method) << "' was expected to be of type "
<< expected_type << " but instead was found to be of type " << found_type;
AddReferrerLocation(msg, referrer);
Thread::Current()->ThrowNewException("Ljava/lang/IncompatibleClassChangeError;",
msg.str().c_str());
}
void ThrowIncompatibleClassChangeErrorClassForInterfaceDispatch(const AbstractMethod* interface_method,
Object* this_object,
const AbstractMethod* referrer) {
// Referrer is calling interface_method on this_object, however, the interface_method isn't
// implemented by this_object.
CHECK(this_object != NULL);
std::ostringstream msg;
msg << "Class '" << PrettyDescriptor(this_object->GetClass())
<< "' does not implement interface '"
<< PrettyDescriptor(interface_method->GetDeclaringClass())
<< "' in call to '" << PrettyMethod(interface_method) << "'";
AddReferrerLocation(msg, referrer);
Thread::Current()->ThrowNewException("Ljava/lang/IncompatibleClassChangeError;",
msg.str().c_str());
}
void ThrowIncompatibleClassChangeErrorField(const Field* resolved_field, bool is_static,
const AbstractMethod* referrer) {
std::ostringstream msg;
msg << "Expected '" << PrettyField(resolved_field) << "' to be a "
<< (is_static ? "static" : "instance") << " field" << " rather than a "
<< (is_static ? "instance" : "static") << " field";
AddReferrerLocation(msg, referrer);
Thread::Current()->ThrowNewException("Ljava/lang/IncompatibleClassChangeError;",
msg.str().c_str());
}
// NoSuchMethodError
void ThrowNoSuchMethodError(InvokeType type, Class* c, const StringPiece& name,
const StringPiece& signature, const AbstractMethod* referrer) {
std::ostringstream msg;
ClassHelper kh(c);
msg << "No " << type << " method " << name << signature
<< " in class " << kh.GetDescriptor() << " or its super classes";
AddReferrerLocation(msg, referrer);
Thread::Current()->ThrowNewException("Ljava/lang/NoSuchMethodError;", msg.str().c_str());
}
void ThrowNoSuchMethodError(uint32_t method_idx, const AbstractMethod* referrer) {
DexCache* dex_cache = referrer->GetDeclaringClass()->GetDexCache();
const DexFile& dex_file = *dex_cache->GetDexFile();
std::ostringstream msg;
msg << "No method '" << PrettyMethod(method_idx, dex_file, true) << "'";
AddReferrerLocation(msg, referrer);
Thread::Current()->ThrowNewException("Ljava/lang/NoSuchMethodError;", msg.str().c_str());
}
} // namespace art