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      1 /*
      2  * Copyright (C) 2012 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "dex_instruction.h"
     18 #include "entrypoints/entrypoint_utils-inl.h"
     19 #include "mirror/art_method-inl.h"
     20 #include "mirror/object-inl.h"
     21 
     22 namespace art {
     23 
     24 extern "C" void art_portable_throw_div_zero_from_code() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
     25   ThrowArithmeticExceptionDivideByZero();
     26 }
     27 
     28 extern "C" void art_portable_throw_array_bounds_from_code(int32_t index, int32_t length)
     29     SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
     30   ThrowArrayIndexOutOfBoundsException(index, length);
     31 }
     32 
     33 extern "C" void art_portable_throw_no_such_method_from_code(int32_t method_idx)
     34     SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
     35   ThrowNoSuchMethodError(method_idx);
     36 }
     37 
     38 extern "C" void art_portable_throw_null_pointer_exception_from_code(uint32_t dex_pc)
     39     SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
     40   // TODO: remove dex_pc argument from caller.
     41   UNUSED(dex_pc);
     42   Thread* self = Thread::Current();
     43   ThrowLocation throw_location = self->GetCurrentLocationForThrow();
     44   ThrowNullPointerExceptionFromDexPC(throw_location);
     45 }
     46 
     47 extern "C" void art_portable_throw_stack_overflow_from_code() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
     48   ThrowStackOverflowError(Thread::Current());
     49 }
     50 
     51 extern "C" void art_portable_throw_exception_from_code(mirror::Throwable* exception)
     52     SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
     53   Thread* self = Thread::Current();
     54   ThrowLocation throw_location = self->GetCurrentLocationForThrow();
     55   if (exception == NULL) {
     56     ThrowNullPointerException(NULL, "throw with null exception");
     57   } else {
     58     self->SetException(throw_location, exception);
     59   }
     60 }
     61 
     62 extern "C" void* art_portable_get_and_clear_exception(Thread* self)
     63     SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
     64   DCHECK(self->IsExceptionPending());
     65   // TODO: make this inline.
     66   mirror::Throwable* exception = self->GetException(NULL);
     67   self->ClearException();
     68   return exception;
     69 }
     70 
     71 extern "C" int32_t art_portable_find_catch_block_from_code(mirror::ArtMethod* current_method,
     72                                                            uint32_t ti_offset)
     73     SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
     74   Thread* self = Thread::Current();  // TODO: make an argument.
     75   ThrowLocation throw_location;
     76   mirror::Throwable* exception = self->GetException(&throw_location);
     77   // Check for special deoptimization exception.
     78   if (UNLIKELY(reinterpret_cast<intptr_t>(exception) == -1)) {
     79     return -1;
     80   }
     81   mirror::Class* exception_type = exception->GetClass();
     82   StackHandleScope<1> hs(self);
     83   const DexFile::CodeItem* code_item = current_method->GetCodeItem();
     84   DCHECK_LT(ti_offset, code_item->tries_size_);
     85   const DexFile::TryItem* try_item = DexFile::GetTryItems(*code_item, ti_offset);
     86 
     87   int iter_index = 0;
     88   int result = -1;
     89   uint32_t catch_dex_pc = -1;
     90   // Iterate over the catch handlers associated with dex_pc
     91   for (CatchHandlerIterator it(*code_item, *try_item); it.HasNext(); it.Next()) {
     92     uint16_t iter_type_idx = it.GetHandlerTypeIndex();
     93     // Catch all case
     94     if (iter_type_idx == DexFile::kDexNoIndex16) {
     95       catch_dex_pc = it.GetHandlerAddress();
     96       result = iter_index;
     97       break;
     98     }
     99     // Does this catch exception type apply?
    100     mirror::Class* iter_exception_type =
    101         current_method->GetDexCacheResolvedType(iter_type_idx);
    102     if (UNLIKELY(iter_exception_type == NULL)) {
    103       // TODO: check, the verifier (class linker?) should take care of resolving all exception
    104       //       classes early.
    105       LOG(WARNING) << "Unresolved exception class when finding catch block: "
    106           << current_method->GetTypeDescriptorFromTypeIdx(iter_type_idx);
    107     } else if (iter_exception_type->IsAssignableFrom(exception_type)) {
    108       catch_dex_pc = it.GetHandlerAddress();
    109       result = iter_index;
    110       break;
    111     }
    112     ++iter_index;
    113   }
    114   if (result != -1) {
    115     // Handler found.
    116     Runtime::Current()->GetInstrumentation()->ExceptionCaughtEvent(
    117         self, throw_location, current_method, catch_dex_pc, exception);
    118     // If the catch block has no move-exception then clear the exception for it.
    119     const Instruction* first_catch_instr = Instruction::At(
    120         &current_method->GetCodeItem()->insns_[catch_dex_pc]);
    121     if (first_catch_instr->Opcode() != Instruction::MOVE_EXCEPTION) {
    122       self->ClearException();
    123     }
    124   }
    125   return result;
    126 }
    127 
    128 }  // namespace art
    129