blob: 4f4bed0169aa8a0e1a5e8b0a593928eb1f233364 [file] [log] [blame]
/*
* 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 <sstream>
#include "android-base/stringprintf.h"
#include "ScopedLocalRef.h"
#include "art_field-inl.h"
#include "art_method-inl.h"
#include "base/logging.h"
#include "class_linker-inl.h"
#include "dex_file-inl.h"
#include "dex_instruction-inl.h"
#include "invoke_type.h"
#include "mirror/class-inl.h"
#include "mirror/method_type.h"
#include "mirror/object-inl.h"
#include "mirror/object_array-inl.h"
#include "obj_ptr-inl.h"
#include "thread.h"
#include "verifier/method_verifier.h"
namespace art {
using android::base::StringAppendV;
using android::base::StringPrintf;
static void AddReferrerLocation(std::ostream& os, ObjPtr<mirror::Class> referrer)
REQUIRES_SHARED(Locks::mutator_lock_) {
if (referrer != nullptr) {
std::string location(referrer->GetLocation());
if (!location.empty()) {
os << " (declaration of '" << referrer->PrettyDescriptor()
<< "' appears in " << location << ")";
}
}
}
static void ThrowException(const char* exception_descriptor,
ObjPtr<mirror::Class> referrer,
const char* fmt,
va_list* args = nullptr)
REQUIRES_SHARED(Locks::mutator_lock_) {
std::ostringstream msg;
if (args != nullptr) {
std::string vmsg;
StringAppendV(&vmsg, fmt, *args);
msg << vmsg;
} else {
msg << fmt;
}
AddReferrerLocation(msg, referrer);
Thread* self = Thread::Current();
self->ThrowNewException(exception_descriptor, msg.str().c_str());
}
static void ThrowWrappedException(const char* exception_descriptor,
ObjPtr<mirror::Class> referrer,
const char* fmt,
va_list* args = nullptr)
REQUIRES_SHARED(Locks::mutator_lock_) {
std::ostringstream msg;
if (args != nullptr) {
std::string vmsg;
StringAppendV(&vmsg, fmt, *args);
msg << vmsg;
} else {
msg << fmt;
}
AddReferrerLocation(msg, referrer);
Thread* self = Thread::Current();
self->ThrowNewWrappedException(exception_descriptor, msg.str().c_str());
}
// AbstractMethodError
void ThrowAbstractMethodError(ArtMethod* method) {
ThrowException("Ljava/lang/AbstractMethodError;", nullptr,
StringPrintf("abstract method \"%s\"",
ArtMethod::PrettyMethod(method).c_str()).c_str());
}
void ThrowAbstractMethodError(uint32_t method_idx, const DexFile& dex_file) {
ThrowException("Ljava/lang/AbstractMethodError;", /* referrer */ nullptr,
StringPrintf("abstract method \"%s\"",
dex_file.PrettyMethod(method_idx,
/* with_signature */ true).c_str()).c_str());
}
// ArithmeticException
void ThrowArithmeticExceptionDivideByZero() {
ThrowException("Ljava/lang/ArithmeticException;", nullptr, "divide by zero");
}
// ArrayIndexOutOfBoundsException
void ThrowArrayIndexOutOfBoundsException(int index, int length) {
ThrowException("Ljava/lang/ArrayIndexOutOfBoundsException;", nullptr,
StringPrintf("length=%d; index=%d", length, index).c_str());
}
// ArrayStoreException
void ThrowArrayStoreException(ObjPtr<mirror::Class> element_class,
ObjPtr<mirror::Class> array_class) {
ThrowException("Ljava/lang/ArrayStoreException;", nullptr,
StringPrintf("%s cannot be stored in an array of type %s",
mirror::Class::PrettyDescriptor(element_class).c_str(),
mirror::Class::PrettyDescriptor(array_class).c_str()).c_str());
}
// BootstrapMethodError
void ThrowBootstrapMethodError(const char* fmt, ...) {
va_list args;
va_start(args, fmt);
ThrowException("Ljava/lang/BootstrapMethodError;", nullptr, fmt, &args);
va_end(args);
}
void ThrowWrappedBootstrapMethodError(const char* fmt, ...) {
va_list args;
va_start(args, fmt);
ThrowWrappedException("Ljava/lang/BootstrapMethodError;", nullptr, fmt, &args);
va_end(args);
}
// ClassCastException
void ThrowClassCastException(ObjPtr<mirror::Class> dest_type, ObjPtr<mirror::Class> src_type) {
ThrowException("Ljava/lang/ClassCastException;", nullptr,
StringPrintf("%s cannot be cast to %s",
mirror::Class::PrettyDescriptor(src_type).c_str(),
mirror::Class::PrettyDescriptor(dest_type).c_str()).c_str());
}
void ThrowClassCastException(const char* msg) {
ThrowException("Ljava/lang/ClassCastException;", nullptr, msg);
}
// ClassCircularityError
void ThrowClassCircularityError(ObjPtr<mirror::Class> c) {
std::ostringstream msg;
msg << mirror::Class::PrettyDescriptor(c);
ThrowException("Ljava/lang/ClassCircularityError;", c, msg.str().c_str());
}
void ThrowClassCircularityError(ObjPtr<mirror::Class> c, const char* fmt, ...) {
va_list args;
va_start(args, fmt);
ThrowException("Ljava/lang/ClassCircularityError;", c, fmt, &args);
va_end(args);
}
// ClassFormatError
void ThrowClassFormatError(ObjPtr<mirror::Class> referrer, const char* fmt, ...) {
va_list args;
va_start(args, fmt);
ThrowException("Ljava/lang/ClassFormatError;", referrer, fmt, &args);
va_end(args);
}
// IllegalAccessError
void ThrowIllegalAccessErrorClass(ObjPtr<mirror::Class> referrer, ObjPtr<mirror::Class> accessed) {
std::ostringstream msg;
msg << "Illegal class access: '" << mirror::Class::PrettyDescriptor(referrer)
<< "' attempting to access '" << mirror::Class::PrettyDescriptor(accessed) << "'";
ThrowException("Ljava/lang/IllegalAccessError;", referrer, msg.str().c_str());
}
void ThrowIllegalAccessErrorClassForMethodDispatch(ObjPtr<mirror::Class> referrer,
ObjPtr<mirror::Class> accessed,
ArtMethod* called,
InvokeType type) {
std::ostringstream msg;
msg << "Illegal class access ('" << mirror::Class::PrettyDescriptor(referrer)
<< "' attempting to access '"
<< mirror::Class::PrettyDescriptor(accessed) << "') in attempt to invoke " << type
<< " method " << ArtMethod::PrettyMethod(called).c_str();
ThrowException("Ljava/lang/IllegalAccessError;", referrer, msg.str().c_str());
}
void ThrowIllegalAccessErrorMethod(ObjPtr<mirror::Class> referrer, ArtMethod* accessed) {
std::ostringstream msg;
msg << "Method '" << ArtMethod::PrettyMethod(accessed) << "' is inaccessible to class '"
<< mirror::Class::PrettyDescriptor(referrer) << "'";
ThrowException("Ljava/lang/IllegalAccessError;", referrer, msg.str().c_str());
}
void ThrowIllegalAccessErrorField(ObjPtr<mirror::Class> referrer, ArtField* accessed) {
std::ostringstream msg;
msg << "Field '" << ArtField::PrettyField(accessed, false) << "' is inaccessible to class '"
<< mirror::Class::PrettyDescriptor(referrer) << "'";
ThrowException("Ljava/lang/IllegalAccessError;", referrer, msg.str().c_str());
}
void ThrowIllegalAccessErrorFinalField(ArtMethod* referrer, ArtField* accessed) {
std::ostringstream msg;
msg << "Final field '" << ArtField::PrettyField(accessed, false)
<< "' cannot be written to by method '" << ArtMethod::PrettyMethod(referrer) << "'";
ThrowException("Ljava/lang/IllegalAccessError;",
referrer != nullptr ? referrer->GetDeclaringClass() : nullptr,
msg.str().c_str());
}
void ThrowIllegalAccessError(ObjPtr<mirror::Class> referrer, const char* fmt, ...) {
va_list args;
va_start(args, fmt);
ThrowException("Ljava/lang/IllegalAccessError;", referrer, fmt, &args);
va_end(args);
}
// IllegalAccessException
void ThrowIllegalAccessException(const char* msg) {
ThrowException("Ljava/lang/IllegalAccessException;", nullptr, msg);
}
// IllegalArgumentException
void ThrowIllegalArgumentException(const char* msg) {
ThrowException("Ljava/lang/IllegalArgumentException;", nullptr, msg);
}
// IncompatibleClassChangeError
void ThrowIncompatibleClassChangeError(InvokeType expected_type, InvokeType found_type,
ArtMethod* method, ArtMethod* referrer) {
std::ostringstream msg;
msg << "The method '" << ArtMethod::PrettyMethod(method) << "' was expected to be of type "
<< expected_type << " but instead was found to be of type " << found_type;
ThrowException("Ljava/lang/IncompatibleClassChangeError;",
referrer != nullptr ? referrer->GetDeclaringClass() : nullptr,
msg.str().c_str());
}
void ThrowIncompatibleClassChangeErrorClassForInterfaceSuper(ArtMethod* method,
ObjPtr<mirror::Class> target_class,
ObjPtr<mirror::Object> this_object,
ArtMethod* referrer) {
// Referrer is calling interface_method on this_object, however, the interface_method isn't
// implemented by this_object.
CHECK(this_object != nullptr);
std::ostringstream msg;
msg << "Class '" << mirror::Class::PrettyDescriptor(this_object->GetClass())
<< "' does not implement interface '" << mirror::Class::PrettyDescriptor(target_class)
<< "' in call to '"
<< ArtMethod::PrettyMethod(method) << "'";
ThrowException("Ljava/lang/IncompatibleClassChangeError;",
referrer != nullptr ? referrer->GetDeclaringClass() : nullptr,
msg.str().c_str());
}
void ThrowIncompatibleClassChangeErrorClassForInterfaceDispatch(ArtMethod* interface_method,
ObjPtr<mirror::Object> this_object,
ArtMethod* referrer) {
// Referrer is calling interface_method on this_object, however, the interface_method isn't
// implemented by this_object.
CHECK(this_object != nullptr);
std::ostringstream msg;
msg << "Class '" << mirror::Class::PrettyDescriptor(this_object->GetClass())
<< "' does not implement interface '"
<< mirror::Class::PrettyDescriptor(interface_method->GetDeclaringClass())
<< "' in call to '" << ArtMethod::PrettyMethod(interface_method) << "'";
ThrowException("Ljava/lang/IncompatibleClassChangeError;",
referrer != nullptr ? referrer->GetDeclaringClass() : nullptr,
msg.str().c_str());
}
void ThrowIncompatibleClassChangeErrorField(ArtField* resolved_field, bool is_static,
ArtMethod* referrer) {
std::ostringstream msg;
msg << "Expected '" << ArtField::PrettyField(resolved_field) << "' to be a "
<< (is_static ? "static" : "instance") << " field" << " rather than a "
<< (is_static ? "instance" : "static") << " field";
ThrowException("Ljava/lang/IncompatibleClassChangeError;", referrer->GetDeclaringClass(),
msg.str().c_str());
}
void ThrowIncompatibleClassChangeError(ObjPtr<mirror::Class> referrer, const char* fmt, ...) {
va_list args;
va_start(args, fmt);
ThrowException("Ljava/lang/IncompatibleClassChangeError;", referrer, fmt, &args);
va_end(args);
}
void ThrowIncompatibleClassChangeErrorForMethodConflict(ArtMethod* method) {
DCHECK(method != nullptr);
ThrowException("Ljava/lang/IncompatibleClassChangeError;",
/*referrer*/nullptr,
StringPrintf("Conflicting default method implementations %s",
ArtMethod::PrettyMethod(method).c_str()).c_str());
}
// IOException
void ThrowIOException(const char* fmt, ...) {
va_list args;
va_start(args, fmt);
ThrowException("Ljava/io/IOException;", nullptr, fmt, &args);
va_end(args);
}
void ThrowWrappedIOException(const char* fmt, ...) {
va_list args;
va_start(args, fmt);
ThrowWrappedException("Ljava/io/IOException;", nullptr, fmt, &args);
va_end(args);
}
// LinkageError
void ThrowLinkageError(ObjPtr<mirror::Class> referrer, const char* fmt, ...) {
va_list args;
va_start(args, fmt);
ThrowException("Ljava/lang/LinkageError;", referrer, fmt, &args);
va_end(args);
}
void ThrowWrappedLinkageError(ObjPtr<mirror::Class> referrer, const char* fmt, ...) {
va_list args;
va_start(args, fmt);
ThrowWrappedException("Ljava/lang/LinkageError;", referrer, fmt, &args);
va_end(args);
}
// NegativeArraySizeException
void ThrowNegativeArraySizeException(int size) {
ThrowException("Ljava/lang/NegativeArraySizeException;", nullptr,
StringPrintf("%d", size).c_str());
}
void ThrowNegativeArraySizeException(const char* msg) {
ThrowException("Ljava/lang/NegativeArraySizeException;", nullptr, msg);
}
// NoSuchFieldError
void ThrowNoSuchFieldError(const StringPiece& scope, ObjPtr<mirror::Class> c,
const StringPiece& type, const StringPiece& name) {
std::ostringstream msg;
std::string temp;
msg << "No " << scope << "field " << name << " of type " << type
<< " in class " << c->GetDescriptor(&temp) << " or its superclasses";
ThrowException("Ljava/lang/NoSuchFieldError;", c, msg.str().c_str());
}
void ThrowNoSuchFieldException(ObjPtr<mirror::Class> c, const StringPiece& name) {
std::ostringstream msg;
std::string temp;
msg << "No field " << name << " in class " << c->GetDescriptor(&temp);
ThrowException("Ljava/lang/NoSuchFieldException;", c, msg.str().c_str());
}
// NoSuchMethodError
void ThrowNoSuchMethodError(InvokeType type, ObjPtr<mirror::Class> c, const StringPiece& name,
const Signature& signature) {
std::ostringstream msg;
std::string temp;
msg << "No " << type << " method " << name << signature
<< " in class " << c->GetDescriptor(&temp) << " or its super classes";
ThrowException("Ljava/lang/NoSuchMethodError;", c, msg.str().c_str());
}
// NullPointerException
void ThrowNullPointerExceptionForFieldAccess(ArtField* field, bool is_read) {
std::ostringstream msg;
msg << "Attempt to " << (is_read ? "read from" : "write to")
<< " field '" << ArtField::PrettyField(field, true) << "' on a null object reference";
ThrowException("Ljava/lang/NullPointerException;", nullptr, msg.str().c_str());
}
static void ThrowNullPointerExceptionForMethodAccessImpl(uint32_t method_idx,
const DexFile& dex_file,
InvokeType type)
REQUIRES_SHARED(Locks::mutator_lock_) {
std::ostringstream msg;
msg << "Attempt to invoke " << type << " method '"
<< dex_file.PrettyMethod(method_idx, true) << "' on a null object reference";
ThrowException("Ljava/lang/NullPointerException;", nullptr, msg.str().c_str());
}
void ThrowNullPointerExceptionForMethodAccess(uint32_t method_idx,
InvokeType type) {
ObjPtr<mirror::DexCache> dex_cache =
Thread::Current()->GetCurrentMethod(nullptr)->GetDeclaringClass()->GetDexCache();
const DexFile& dex_file = *dex_cache->GetDexFile();
ThrowNullPointerExceptionForMethodAccessImpl(method_idx, dex_file, type);
}
void ThrowNullPointerExceptionForMethodAccess(ArtMethod* method,
InvokeType type) {
ObjPtr<mirror::DexCache> dex_cache = method->GetDeclaringClass()->GetDexCache();
const DexFile& dex_file = *dex_cache->GetDexFile();
ThrowNullPointerExceptionForMethodAccessImpl(method->GetDexMethodIndex(),
dex_file, type);
}
static bool IsValidReadBarrierImplicitCheck(uintptr_t addr) {
DCHECK(kEmitCompilerReadBarrier);
uint32_t monitor_offset = mirror::Object::MonitorOffset().Uint32Value();
if (kUseBakerReadBarrier && (kRuntimeISA == kX86 || kRuntimeISA == kX86_64)) {
constexpr uint32_t gray_byte_position = LockWord::kReadBarrierStateShift / kBitsPerByte;
monitor_offset += gray_byte_position;
}
return addr == monitor_offset;
}
static bool IsValidImplicitCheck(uintptr_t addr, ArtMethod* method, const Instruction& instr)
REQUIRES_SHARED(Locks::mutator_lock_) {
if (!CanDoImplicitNullCheckOn(addr)) {
return false;
}
switch (instr.Opcode()) {
case Instruction::INVOKE_DIRECT:
case Instruction::INVOKE_DIRECT_RANGE:
case Instruction::INVOKE_VIRTUAL:
case Instruction::INVOKE_VIRTUAL_RANGE:
case Instruction::INVOKE_INTERFACE:
case Instruction::INVOKE_INTERFACE_RANGE:
case Instruction::INVOKE_POLYMORPHIC:
case Instruction::INVOKE_POLYMORPHIC_RANGE:
case Instruction::INVOKE_VIRTUAL_QUICK:
case Instruction::INVOKE_VIRTUAL_RANGE_QUICK: {
// Without inlining, we could just check that the offset is the class offset.
// However, when inlining, the compiler can (validly) merge the null check with a field access
// on the same object. Note that the stack map at the NPE will reflect the invoke's location,
// which is the caller.
return true;
}
case Instruction::IGET_OBJECT:
if (kEmitCompilerReadBarrier && IsValidReadBarrierImplicitCheck(addr)) {
return true;
}
FALLTHROUGH_INTENDED;
case Instruction::IGET:
case Instruction::IGET_WIDE:
case Instruction::IGET_BOOLEAN:
case Instruction::IGET_BYTE:
case Instruction::IGET_CHAR:
case Instruction::IGET_SHORT:
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: {
ArtField* field =
Runtime::Current()->GetClassLinker()->ResolveField(instr.VRegC_22c(), method, false);
return (addr == 0) || (addr == field->GetOffset().Uint32Value());
}
case Instruction::IGET_OBJECT_QUICK:
if (kEmitCompilerReadBarrier && IsValidReadBarrierImplicitCheck(addr)) {
return true;
}
FALLTHROUGH_INTENDED;
case Instruction::IGET_QUICK:
case Instruction::IGET_BOOLEAN_QUICK:
case Instruction::IGET_BYTE_QUICK:
case Instruction::IGET_CHAR_QUICK:
case Instruction::IGET_SHORT_QUICK:
case Instruction::IGET_WIDE_QUICK:
case Instruction::IPUT_QUICK:
case Instruction::IPUT_BOOLEAN_QUICK:
case Instruction::IPUT_BYTE_QUICK:
case Instruction::IPUT_CHAR_QUICK:
case Instruction::IPUT_SHORT_QUICK:
case Instruction::IPUT_WIDE_QUICK:
case Instruction::IPUT_OBJECT_QUICK: {
return (addr == 0u) || (addr == instr.VRegC_22c());
}
case Instruction::AGET_OBJECT:
if (kEmitCompilerReadBarrier && IsValidReadBarrierImplicitCheck(addr)) {
return true;
}
FALLTHROUGH_INTENDED;
case Instruction::AGET:
case Instruction::AGET_WIDE:
case Instruction::AGET_BOOLEAN:
case Instruction::AGET_BYTE:
case Instruction::AGET_CHAR:
case Instruction::AGET_SHORT:
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:
case Instruction::FILL_ARRAY_DATA:
case Instruction::ARRAY_LENGTH: {
// The length access should crash. We currently do not do implicit checks on
// the array access itself.
return (addr == 0u) || (addr == mirror::Array::LengthOffset().Uint32Value());
}
default: {
// We have covered all the cases where an NPE could occur.
// Note that this must be kept in sync with the compiler, and adding
// any new way to do implicit checks in the compiler should also update
// this code.
return false;
}
}
}
void ThrowNullPointerExceptionFromDexPC(bool check_address, uintptr_t addr) {
uint32_t throw_dex_pc;
ArtMethod* method = Thread::Current()->GetCurrentMethod(&throw_dex_pc);
const DexFile::CodeItem* code = method->GetCodeItem();
CHECK_LT(throw_dex_pc, code->insns_size_in_code_units_);
const Instruction* instr = Instruction::At(&code->insns_[throw_dex_pc]);
if (check_address && !IsValidImplicitCheck(addr, method, *instr)) {
const DexFile* dex_file = method->GetDeclaringClass()->GetDexCache()->GetDexFile();
LOG(FATAL) << "Invalid address for an implicit NullPointerException check: "
<< "0x" << std::hex << addr << std::dec
<< ", at "
<< instr->DumpString(dex_file)
<< " in "
<< method->PrettyMethod();
}
switch (instr->Opcode()) {
case Instruction::INVOKE_DIRECT:
ThrowNullPointerExceptionForMethodAccess(instr->VRegB_35c(), kDirect);
break;
case Instruction::INVOKE_DIRECT_RANGE:
ThrowNullPointerExceptionForMethodAccess(instr->VRegB_3rc(), kDirect);
break;
case Instruction::INVOKE_VIRTUAL:
ThrowNullPointerExceptionForMethodAccess(instr->VRegB_35c(), kVirtual);
break;
case Instruction::INVOKE_VIRTUAL_RANGE:
ThrowNullPointerExceptionForMethodAccess(instr->VRegB_3rc(), kVirtual);
break;
case Instruction::INVOKE_INTERFACE:
ThrowNullPointerExceptionForMethodAccess(instr->VRegB_35c(), kInterface);
break;
case Instruction::INVOKE_INTERFACE_RANGE:
ThrowNullPointerExceptionForMethodAccess(instr->VRegB_3rc(), kInterface);
break;
case Instruction::INVOKE_POLYMORPHIC:
ThrowNullPointerExceptionForMethodAccess(instr->VRegB_45cc(), kVirtual);
break;
case Instruction::INVOKE_POLYMORPHIC_RANGE:
ThrowNullPointerExceptionForMethodAccess(instr->VRegB_4rcc(), kVirtual);
break;
case Instruction::INVOKE_VIRTUAL_QUICK:
case Instruction::INVOKE_VIRTUAL_RANGE_QUICK: {
// Since we replaced the method index, we ask the verifier to tell us which
// method is invoked at this location.
ArtMethod* invoked_method =
verifier::MethodVerifier::FindInvokedMethodAtDexPc(method, throw_dex_pc);
if (invoked_method != nullptr) {
// NPE with precise message.
ThrowNullPointerExceptionForMethodAccess(invoked_method, kVirtual);
} else {
// NPE with imprecise message.
ThrowNullPointerException("Attempt to invoke a virtual method on a null object reference");
}
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: {
ArtField* field =
Runtime::Current()->GetClassLinker()->ResolveField(instr->VRegC_22c(), method, false);
ThrowNullPointerExceptionForFieldAccess(field, true /* read */);
break;
}
case Instruction::IGET_QUICK:
case Instruction::IGET_BOOLEAN_QUICK:
case Instruction::IGET_BYTE_QUICK:
case Instruction::IGET_CHAR_QUICK:
case Instruction::IGET_SHORT_QUICK:
case Instruction::IGET_WIDE_QUICK:
case Instruction::IGET_OBJECT_QUICK: {
// Since we replaced the field index, we ask the verifier to tell us which
// field is accessed at this location.
ArtField* field =
verifier::MethodVerifier::FindAccessedFieldAtDexPc(method, throw_dex_pc);
if (field != nullptr) {
// NPE with precise message.
ThrowNullPointerExceptionForFieldAccess(field, true /* read */);
} else {
// NPE with imprecise message.
ThrowNullPointerException("Attempt to read from a field on a null object reference");
}
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: {
ArtField* field =
Runtime::Current()->GetClassLinker()->ResolveField(instr->VRegC_22c(), method, false);
ThrowNullPointerExceptionForFieldAccess(field, false /* write */);
break;
}
case Instruction::IPUT_QUICK:
case Instruction::IPUT_BOOLEAN_QUICK:
case Instruction::IPUT_BYTE_QUICK:
case Instruction::IPUT_CHAR_QUICK:
case Instruction::IPUT_SHORT_QUICK:
case Instruction::IPUT_WIDE_QUICK:
case Instruction::IPUT_OBJECT_QUICK: {
// Since we replaced the field index, we ask the verifier to tell us which
// field is accessed at this location.
ArtField* field =
verifier::MethodVerifier::FindAccessedFieldAtDexPc(method, throw_dex_pc);
if (field != nullptr) {
// NPE with precise message.
ThrowNullPointerExceptionForFieldAccess(field, false /* write */);
} else {
// NPE with imprecise message.
ThrowNullPointerException("Attempt to write to a field on a null object reference");
}
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:
ThrowException("Ljava/lang/NullPointerException;", nullptr,
"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:
ThrowException("Ljava/lang/NullPointerException;", nullptr,
"Attempt to write to null array");
break;
case Instruction::ARRAY_LENGTH:
ThrowException("Ljava/lang/NullPointerException;", nullptr,
"Attempt to get length of null array");
break;
case Instruction::FILL_ARRAY_DATA: {
ThrowException("Ljava/lang/NullPointerException;", nullptr,
"Attempt to write to null array");
break;
}
case Instruction::MONITOR_ENTER:
case Instruction::MONITOR_EXIT: {
ThrowException("Ljava/lang/NullPointerException;", nullptr,
"Attempt to do a synchronize operation on a null object");
break;
}
default: {
const DexFile* dex_file =
method->GetDeclaringClass()->GetDexCache()->GetDexFile();
LOG(FATAL) << "NullPointerException at an unexpected instruction: "
<< instr->DumpString(dex_file)
<< " in "
<< method->PrettyMethod();
break;
}
}
}
void ThrowNullPointerException(const char* msg) {
ThrowException("Ljava/lang/NullPointerException;", nullptr, msg);
}
// RuntimeException
void ThrowRuntimeException(const char* fmt, ...) {
va_list args;
va_start(args, fmt);
ThrowException("Ljava/lang/RuntimeException;", nullptr, fmt, &args);
va_end(args);
}
// SecurityException
void ThrowSecurityException(const char* fmt, ...) {
va_list args;
va_start(args, fmt);
ThrowException("Ljava/lang/SecurityException;", nullptr, fmt, &args);
va_end(args);
}
// Stack overflow.
void ThrowStackOverflowError(Thread* self) {
if (self->IsHandlingStackOverflow()) {
LOG(ERROR) << "Recursive stack overflow.";
// We don't fail here because SetStackEndForStackOverflow will print better diagnostics.
}
self->SetStackEndForStackOverflow(); // Allow space on the stack for constructor to execute.
JNIEnvExt* env = self->GetJniEnv();
std::string msg("stack size ");
msg += PrettySize(self->GetStackSize());
// Avoid running Java code for exception initialization.
// TODO: Checks to make this a bit less brittle.
std::string error_msg;
// Allocate an uninitialized object.
ScopedLocalRef<jobject> exc(env,
env->AllocObject(WellKnownClasses::java_lang_StackOverflowError));
if (exc.get() != nullptr) {
// "Initialize".
// StackOverflowError -> VirtualMachineError -> Error -> Throwable -> Object.
// Only Throwable has "custom" fields:
// String detailMessage.
// Throwable cause (= this).
// List<Throwable> suppressedExceptions (= Collections.emptyList()).
// Object stackState;
// StackTraceElement[] stackTrace;
// Only Throwable has a non-empty constructor:
// this.stackTrace = EmptyArray.STACK_TRACE_ELEMENT;
// fillInStackTrace();
// detailMessage.
// TODO: Use String::FromModifiedUTF...?
ScopedLocalRef<jstring> s(env, env->NewStringUTF(msg.c_str()));
if (s.get() != nullptr) {
env->SetObjectField(exc.get(), WellKnownClasses::java_lang_Throwable_detailMessage, s.get());
// cause.
env->SetObjectField(exc.get(), WellKnownClasses::java_lang_Throwable_cause, exc.get());
// suppressedExceptions.
ScopedLocalRef<jobject> emptylist(env, env->GetStaticObjectField(
WellKnownClasses::java_util_Collections,
WellKnownClasses::java_util_Collections_EMPTY_LIST));
CHECK(emptylist.get() != nullptr);
env->SetObjectField(exc.get(),
WellKnownClasses::java_lang_Throwable_suppressedExceptions,
emptylist.get());
// stackState is set as result of fillInStackTrace. fillInStackTrace calls
// nativeFillInStackTrace.
ScopedLocalRef<jobject> stack_state_val(env, nullptr);
{
ScopedObjectAccessUnchecked soa(env);
stack_state_val.reset(soa.Self()->CreateInternalStackTrace<false>(soa));
}
if (stack_state_val.get() != nullptr) {
env->SetObjectField(exc.get(),
WellKnownClasses::java_lang_Throwable_stackState,
stack_state_val.get());
// stackTrace.
ScopedLocalRef<jobject> stack_trace_elem(env, env->GetStaticObjectField(
WellKnownClasses::libcore_util_EmptyArray,
WellKnownClasses::libcore_util_EmptyArray_STACK_TRACE_ELEMENT));
env->SetObjectField(exc.get(),
WellKnownClasses::java_lang_Throwable_stackTrace,
stack_trace_elem.get());
} else {
error_msg = "Could not create stack trace.";
}
// Throw the exception.
self->SetException(self->DecodeJObject(exc.get())->AsThrowable());
} else {
// Could not allocate a string object.
error_msg = "Couldn't throw new StackOverflowError because JNI NewStringUTF failed.";
}
} else {
error_msg = "Could not allocate StackOverflowError object.";
}
if (!error_msg.empty()) {
LOG(WARNING) << error_msg;
CHECK(self->IsExceptionPending());
}
bool explicit_overflow_check = Runtime::Current()->ExplicitStackOverflowChecks();
self->ResetDefaultStackEnd(); // Return to default stack size.
// And restore protection if implicit checks are on.
if (!explicit_overflow_check) {
self->ProtectStack();
}
}
// StringIndexOutOfBoundsException
void ThrowStringIndexOutOfBoundsException(int index, int length) {
ThrowException("Ljava/lang/StringIndexOutOfBoundsException;", nullptr,
StringPrintf("length=%d; index=%d", length, index).c_str());
}
// VerifyError
void ThrowVerifyError(ObjPtr<mirror::Class> referrer, const char* fmt, ...) {
va_list args;
va_start(args, fmt);
ThrowException("Ljava/lang/VerifyError;", referrer, fmt, &args);
va_end(args);
}
// WrongMethodTypeException
void ThrowWrongMethodTypeException(mirror::MethodType* callee_type,
mirror::MethodType* callsite_type) {
ThrowException("Ljava/lang/invoke/WrongMethodTypeException;",
nullptr,
StringPrintf("Expected %s but was %s",
callee_type->PrettyDescriptor().c_str(),
callsite_type->PrettyDescriptor().c_str()).c_str());
}
} // namespace art