exception_test.cc revision f8bbb8448c733e9e3ad43aad69774c37888329b1 
1/*
2 * Copyright (C) 2011 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 <sys/mman.h>
18
19#include "UniquePtr.h"
20#include "assembler.h"
21#include "class_linker.h"
22#include "common_test.h"
23#include "dex_file.h"
24#include "gtest/gtest.h"
25#include "runtime.h"
26#include "thread.h"
27
28namespace art {
29
30class ExceptionTest : public CommonTest {
31 protected:
32  virtual void SetUp() {
33    CommonTest::SetUp();
34
35    SirtRef<ClassLoader> class_loader(LoadDex("ExceptionHandle"));
36    my_klass_ = class_linker_->FindClass("LExceptionHandle;", class_loader.get());
37    ASSERT_TRUE(my_klass_ != NULL);
38
39    dex_ = &Runtime::Current()->GetClassLinker()->FindDexFile(my_klass_->GetDexCache());
40
41    uint32_t code_size = 12;
42    fake_code_.push_back((code_size >> 24) & 0xFF);
43    fake_code_.push_back((code_size >> 16) & 0xFF);
44    fake_code_.push_back((code_size >>  8) & 0xFF);
45    fake_code_.push_back((code_size >>  0) & 0xFF);
46    for (size_t i = 0 ; i < code_size; i++) {
47      fake_code_.push_back(0x70 | i);
48    }
49
50    fake_mapping_data_.push_back(2);  // first element is count of remaining elements
51    fake_mapping_data_.push_back(3);  // offset 3
52    fake_mapping_data_.push_back(3);  // maps to dex offset 3
53
54    method_f_ = my_klass_->FindVirtualMethod("f", "()I");
55    ASSERT_TRUE(method_f_ != NULL);
56    method_f_->SetFrameSizeInBytes(kStackAlignment);
57    method_f_->SetCode(CompiledMethod::CodePointer(&fake_code_[sizeof(code_size)], kThumb2));
58    method_f_->SetMappingTable(&fake_mapping_data_[0]);
59
60    method_g_ = my_klass_->FindVirtualMethod("g", "(I)V");
61    ASSERT_TRUE(method_g_ != NULL);
62    method_g_->SetFrameSizeInBytes(kStackAlignment);
63    method_g_->SetCode(CompiledMethod::CodePointer(&fake_code_[sizeof(code_size)], kThumb2));
64    method_g_->SetMappingTable(&fake_mapping_data_[0]);
65  }
66
67  const DexFile* dex_;
68
69  std::vector<uint8_t> fake_code_;
70  std::vector<uint32_t> fake_mapping_data_;
71
72  Method* method_f_;
73  Method* method_g_;
74
75 private:
76  Class* my_klass_;
77};
78
79TEST_F(ExceptionTest, FindCatchHandler) {
80  const DexFile::CodeItem* code_item = dex_->GetCodeItem(method_f_->GetCodeItemOffset());
81
82  ASSERT_TRUE(code_item != NULL);
83
84  ASSERT_EQ(2u, code_item->tries_size_);
85  ASSERT_NE(0u, code_item->insns_size_in_code_units_);
86
87  const struct DexFile::TryItem *t0, *t1;
88  t0 = dex_->GetTryItems(*code_item, 0);
89  t1 = dex_->GetTryItems(*code_item, 1);
90  EXPECT_LE(t0->start_addr_, t1->start_addr_);
91  {
92    CatchHandlerIterator iter(*code_item, 4 /* Dex PC in the first try block */);
93    EXPECT_STREQ("Ljava/io/IOException;", dex_->StringByTypeIdx(iter.GetHandlerTypeIndex()));
94    ASSERT_TRUE(iter.HasNext());
95    iter.Next();
96    EXPECT_STREQ("Ljava/lang/Exception;", dex_->StringByTypeIdx(iter.GetHandlerTypeIndex()));
97    ASSERT_TRUE(iter.HasNext());
98    iter.Next();
99    EXPECT_FALSE(iter.HasNext());
100  }
101  {
102    CatchHandlerIterator iter(*code_item, 8 /* Dex PC in the second try block */);
103    EXPECT_STREQ("Ljava/io/IOException;", dex_->StringByTypeIdx(iter.GetHandlerTypeIndex()));
104    ASSERT_TRUE(iter.HasNext());
105    iter.Next();
106    EXPECT_FALSE(iter.HasNext());
107  }
108  {
109    CatchHandlerIterator iter(*code_item, 11 /* Dex PC not in any try block */);
110    EXPECT_FALSE(iter.HasNext());
111  }
112}
113
114TEST_F(ExceptionTest, StackTraceElement) {
115  runtime_->Start();
116
117  std::vector<uintptr_t> fake_stack;
118  ASSERT_EQ(kStackAlignment, 16);
119  ASSERT_EQ(sizeof(uintptr_t), sizeof(uint32_t));
120
121  // Create two fake stack frames with mapping data created in SetUp. We map offset 3 in the code
122  // to dex pc 3, however, we set the return pc to 5 as the stack walker always subtracts two
123  // from a return pc.
124  const uintptr_t pc_offset = 3 + 2;
125
126  // Create/push fake 16byte stack frame for method g
127  fake_stack.push_back(reinterpret_cast<uintptr_t>(method_g_));
128  fake_stack.push_back(0);
129  fake_stack.push_back(0);
130  fake_stack.push_back(reinterpret_cast<uintptr_t>(method_f_->GetCode()) + pc_offset);  // return pc
131
132  // Create/push fake 16byte stack frame for method f
133  fake_stack.push_back(reinterpret_cast<uintptr_t>(method_f_));
134  fake_stack.push_back(0);
135  fake_stack.push_back(0);
136  fake_stack.push_back(0xEBAD6070);  // return pc
137
138  // Pull Method* of NULL to terminate the trace
139  fake_stack.push_back(0);
140
141  // Set up thread to appear as if we called out of method_g_ at pc 3
142  Thread* thread = Thread::Current();
143  thread->SetTopOfStack(&fake_stack[0], reinterpret_cast<uintptr_t>(method_g_->GetCode()) + pc_offset);  // return pc
144
145  JNIEnv* env = thread->GetJniEnv();
146  jobject internal = thread->CreateInternalStackTrace(env);
147  ASSERT_TRUE(internal != NULL);
148  jobjectArray ste_array = Thread::InternalStackTraceToStackTraceElementArray(env, internal);
149  ASSERT_TRUE(ste_array != NULL);
150  ObjectArray<StackTraceElement>* trace_array =
151      Decode<ObjectArray<StackTraceElement>*>(env, ste_array);
152
153  ASSERT_TRUE(trace_array != NULL);
154  ASSERT_TRUE(trace_array->Get(0) != NULL);
155  EXPECT_STREQ("ExceptionHandle",
156               trace_array->Get(0)->GetDeclaringClass()->ToModifiedUtf8().c_str());
157  EXPECT_STREQ("ExceptionHandle.java", trace_array->Get(0)->GetFileName()->ToModifiedUtf8().c_str());
158  EXPECT_STREQ("g", trace_array->Get(0)->GetMethodName()->ToModifiedUtf8().c_str());
159  EXPECT_EQ(37, trace_array->Get(0)->GetLineNumber());
160
161  ASSERT_TRUE(trace_array->Get(1) != NULL);
162  EXPECT_STREQ("ExceptionHandle",
163               trace_array->Get(1)->GetDeclaringClass()->ToModifiedUtf8().c_str());
164  EXPECT_STREQ("ExceptionHandle.java", trace_array->Get(1)->GetFileName()->ToModifiedUtf8().c_str());
165  EXPECT_STREQ("f", trace_array->Get(1)->GetMethodName()->ToModifiedUtf8().c_str());
166  EXPECT_EQ(22, trace_array->Get(1)->GetLineNumber());
167}
168
169}  // namespace art
170