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 "throwable.h"
18
19 #include "art_method-inl.h"
20 #include "class-inl.h"
21 #include "dex_file-inl.h"
22 #include "gc/accounting/card_table-inl.h"
23 #include "object-inl.h"
24 #include "object_array.h"
25 #include "object_array-inl.h"
26 #include "stack_trace_element.h"
27 #include "utils.h"
28 #include "well_known_classes.h"
29
30 namespace art {
31 namespace mirror {
32
33 GcRoot<Class> Throwable::java_lang_Throwable_;
34
SetDetailMessage(String * new_detail_message)35 void Throwable::SetDetailMessage(String* new_detail_message) {
36 if (Runtime::Current()->IsActiveTransaction()) {
37 SetFieldObject<true>(OFFSET_OF_OBJECT_MEMBER(Throwable, detail_message_), new_detail_message);
38 } else {
39 SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(Throwable, detail_message_),
40 new_detail_message);
41 }
42 }
43
SetCause(Throwable * cause)44 void Throwable::SetCause(Throwable* cause) {
45 CHECK(cause != nullptr);
46 CHECK(cause != this);
47 Throwable* current_cause = GetFieldObject<Throwable>(OFFSET_OF_OBJECT_MEMBER(Throwable, cause_));
48 CHECK(current_cause == nullptr || current_cause == this);
49 if (Runtime::Current()->IsActiveTransaction()) {
50 SetFieldObject<true>(OFFSET_OF_OBJECT_MEMBER(Throwable, cause_), cause);
51 } else {
52 SetFieldObject<false>(OFFSET_OF_OBJECT_MEMBER(Throwable, cause_), cause);
53 }
54 }
55
SetStackState(Object * state)56 void Throwable::SetStackState(Object* state) SHARED_REQUIRES(Locks::mutator_lock_) {
57 CHECK(state != nullptr);
58 if (Runtime::Current()->IsActiveTransaction()) {
59 SetFieldObjectVolatile<true>(OFFSET_OF_OBJECT_MEMBER(Throwable, backtrace_), state);
60 } else {
61 SetFieldObjectVolatile<false>(OFFSET_OF_OBJECT_MEMBER(Throwable, backtrace_), state);
62 }
63 }
64
IsCheckedException()65 bool Throwable::IsCheckedException() {
66 if (InstanceOf(WellKnownClasses::ToClass(WellKnownClasses::java_lang_Error))) {
67 return false;
68 }
69 return !InstanceOf(WellKnownClasses::ToClass(WellKnownClasses::java_lang_RuntimeException));
70 }
71
GetStackDepth()72 int32_t Throwable::GetStackDepth() {
73 Object* stack_state = GetStackState();
74 if (stack_state == nullptr || !stack_state->IsObjectArray()) {
75 return -1;
76 }
77 mirror::ObjectArray<mirror::Object>* const trace = stack_state->AsObjectArray<mirror::Object>();
78 const int32_t array_len = trace->GetLength();
79 DCHECK_GT(array_len, 0);
80 // See method BuildInternalStackTraceVisitor::Init for the format.
81 return array_len - 1;
82 }
83
Dump()84 std::string Throwable::Dump() {
85 std::string result(PrettyTypeOf(this));
86 result += ": ";
87 String* msg = GetDetailMessage();
88 if (msg != nullptr) {
89 result += msg->ToModifiedUtf8();
90 }
91 result += "\n";
92 Object* stack_state = GetStackState();
93 // check stack state isn't missing or corrupt
94 if (stack_state != nullptr && stack_state->IsObjectArray()) {
95 mirror::ObjectArray<mirror::Object>* object_array =
96 stack_state->AsObjectArray<mirror::Object>();
97 // Decode the internal stack trace into the depth and method trace
98 // See method BuildInternalStackTraceVisitor::Init for the format.
99 DCHECK_GT(object_array->GetLength(), 0);
100 mirror::Object* methods_and_dex_pcs = object_array->Get(0);
101 DCHECK(methods_and_dex_pcs->IsIntArray() || methods_and_dex_pcs->IsLongArray());
102 mirror::PointerArray* method_trace = down_cast<mirror::PointerArray*>(methods_and_dex_pcs);
103 const int32_t array_len = method_trace->GetLength();
104 CHECK_EQ(array_len % 2, 0);
105 const auto depth = array_len / 2;
106 if (depth == 0) {
107 result += "(Throwable with empty stack trace)";
108 } else {
109 const size_t ptr_size = Runtime::Current()->GetClassLinker()->GetImagePointerSize();
110 for (int32_t i = 0; i < depth; ++i) {
111 ArtMethod* method = method_trace->GetElementPtrSize<ArtMethod*>(i, ptr_size);
112 uintptr_t dex_pc = method_trace->GetElementPtrSize<uintptr_t>(i + depth, ptr_size);
113 int32_t line_number = method->GetLineNumFromDexPC(dex_pc);
114 const char* source_file = method->GetDeclaringClassSourceFile();
115 result += StringPrintf(" at %s (%s:%d)\n", PrettyMethod(method, true).c_str(),
116 source_file, line_number);
117 }
118 }
119 } else {
120 Object* stack_trace = GetStackTrace();
121 if (stack_trace != nullptr && stack_trace->IsObjectArray()) {
122 CHECK_EQ(stack_trace->GetClass()->GetComponentType(),
123 StackTraceElement::GetStackTraceElement());
124 auto* ste_array = down_cast<ObjectArray<StackTraceElement>*>(stack_trace);
125 if (ste_array->GetLength() == 0) {
126 result += "(Throwable with empty stack trace)";
127 } else {
128 for (int32_t i = 0; i < ste_array->GetLength(); ++i) {
129 StackTraceElement* ste = ste_array->Get(i);
130 DCHECK(ste != nullptr);
131 auto* method_name = ste->GetMethodName();
132 auto* file_name = ste->GetFileName();
133 result += StringPrintf(
134 " at %s (%s:%d)\n",
135 method_name != nullptr ? method_name->ToModifiedUtf8().c_str() : "<unknown method>",
136 file_name != nullptr ? file_name->ToModifiedUtf8().c_str() : "(Unknown Source)",
137 ste->GetLineNumber());
138 }
139 }
140 } else {
141 result += "(Throwable with no stack trace)";
142 }
143 }
144 Throwable* cause = GetFieldObject<Throwable>(OFFSET_OF_OBJECT_MEMBER(Throwable, cause_));
145 if (cause != nullptr && cause != this) { // Constructor makes cause == this by default.
146 result += "Caused by: ";
147 result += cause->Dump();
148 }
149 return result;
150 }
151
SetClass(Class * java_lang_Throwable)152 void Throwable::SetClass(Class* java_lang_Throwable) {
153 CHECK(java_lang_Throwable_.IsNull());
154 CHECK(java_lang_Throwable != nullptr);
155 java_lang_Throwable_ = GcRoot<Class>(java_lang_Throwable);
156 }
157
ResetClass()158 void Throwable::ResetClass() {
159 CHECK(!java_lang_Throwable_.IsNull());
160 java_lang_Throwable_ = GcRoot<Class>(nullptr);
161 }
162
VisitRoots(RootVisitor * visitor)163 void Throwable::VisitRoots(RootVisitor* visitor) {
164 java_lang_Throwable_.VisitRootIfNonNull(visitor, RootInfo(kRootStickyClass));
165 }
166
167 } // namespace mirror
168 } // namespace art
169