portable_throw_entrypoints.cc revision ea46f950e7a51585db293cd7f047de190a482414 
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.h"
19#include "mirror/art_method-inl.h"
20#include "mirror/object-inl.h"
21
22namespace art {
23
24extern "C" void art_portable_throw_div_zero_from_code() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
25  ThrowArithmeticExceptionDivideByZero();
26}
27
28extern "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
33extern "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
38extern "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
47extern "C" void art_portable_throw_stack_overflow_from_code() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
48  ThrowStackOverflowError(Thread::Current());
49}
50
51extern "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
62extern "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
71extern "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<int32_t>(exception) == -1)) {
79    return -1;
80  }
81  mirror::Class* exception_type = exception->GetClass();
82  MethodHelper mh(current_method);
83  const DexFile::CodeItem* code_item = mh.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 = mh.GetDexCacheResolvedType(iter_type_idx);
101    if (UNLIKELY(iter_exception_type == NULL)) {
102      // TODO: check, the verifier (class linker?) should take care of resolving all exception
103      //       classes early.
104      LOG(WARNING) << "Unresolved exception class when finding catch block: "
105          << mh.GetTypeDescriptorFromTypeIdx(iter_type_idx);
106    } else if (iter_exception_type->IsAssignableFrom(exception_type)) {
107      catch_dex_pc = it.GetHandlerAddress();
108      result = iter_index;
109      break;
110    }
111    ++iter_index;
112  }
113  if (result != -1) {
114    // Handler found.
115    Runtime::Current()->GetInstrumentation()->ExceptionCaughtEvent(self,
116                                                                   throw_location,
117                                                                   current_method,
118                                                                   catch_dex_pc,
119                                                                   exception);
120    // If the catch block has no move-exception then clear the exception for it.
121    const Instruction* first_catch_instr = Instruction::At(&mh.GetCodeItem()->insns_[catch_dex_pc]);
122    if (first_catch_instr->Opcode() != Instruction::MOVE_EXCEPTION) {
123      self->ClearException();
124    }
125  }
126  return result;
127}
128
129}  // namespace art
130