1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
/*
* Copyright (C) 2011 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 "check_reference_map_visitor.h"
#include "jni.h"
namespace art {
#define CHECK_REGS_CONTAIN_REFS(dex_pc, abort_if_not_found, ...) do { \
int t[] = {__VA_ARGS__}; \
int t_size = sizeof(t) / sizeof(*t); \
uintptr_t native_quick_pc = m->ToNativeQuickPc(dex_pc, abort_if_not_found); \
if (native_quick_pc != UINTPTR_MAX) { \
CheckReferences(t, t_size, m->NativeQuickPcOffset(native_quick_pc)); \
} \
} while (false);
struct ReferenceMap2Visitor : public CheckReferenceMapVisitor {
explicit ReferenceMap2Visitor(Thread* thread) SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
: CheckReferenceMapVisitor(thread) {}
bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
if (CheckReferenceMapVisitor::VisitFrame()) {
return true;
}
ArtMethod* m = GetMethod();
std::string m_name(m->GetName());
// Given the method name and the number of times the method has been called,
// we know the Dex registers with live reference values. Assert that what we
// find is what is expected.
if (m_name.compare("f") == 0) {
CHECK_REGS_CONTAIN_REFS(0x03U, true, 8); // v8: this
CHECK_REGS_CONTAIN_REFS(0x06U, true, 8, 1); // v8: this, v1: x
CHECK_REGS_CONTAIN_REFS(0x08U, true, 8, 3, 1); // v8: this, v3: y, v1: x
CHECK_REGS_CONTAIN_REFS(0x0cU, true, 8, 3, 1); // v8: this, v3: y, v1: x
CHECK_REGS_CONTAIN_REFS(0x0eU, true, 8, 3, 1); // v8: this, v3: y, v1: x
CHECK_REGS_CONTAIN_REFS(0x10U, true, 8, 3, 1); // v8: this, v3: y, v1: x
// v2 is added because of the instruction at DexPC 0024. Object merges with 0 is Object. See:
// 0024: move-object v3, v2
// 0025: goto 0013
// Detailed dex instructions for ReferenceMap.java are at the end of this function.
// CHECK_REGS_CONTAIN_REFS(8, 3, 2, 1); // v8: this, v3: y, v2: y, v1: x
// We eliminate the non-live registers at a return, so only v3 is live.
// Note that it is OK for a compiler to not have a dex map at this dex PC because
// a return is not necessarily a safepoint.
CHECK_REGS_CONTAIN_REFS(0x13U, false, 3); // v3: y
// Note that v0: ex can be eliminated because it's a dead merge of two different exceptions.
CHECK_REGS_CONTAIN_REFS(0x18U, true, 8, 2, 1); // v8: this, v2: y, v1: x (dead v0: ex)
CHECK_REGS_CONTAIN_REFS(0x1aU, true, 8, 5, 2, 1); // v8: this, v5: x[1], v2: y, v1: x (dead v0: ex)
CHECK_REGS_CONTAIN_REFS(0x1dU, true, 8, 5, 2, 1); // v8: this, v5: x[1], v2: y, v1: x (dead v0: ex)
// v5 is removed from the root set because there is a "merge" operation.
// See 0015: if-nez v2, 001f.
CHECK_REGS_CONTAIN_REFS(0x1fU, true, 8, 2, 1); // v8: this, v2: y, v1: x (dead v0: ex)
CHECK_REGS_CONTAIN_REFS(0x21U, true, 8, 2, 1); // v8: this, v2: y, v1: x (dead v0: ex)
CHECK_REGS_CONTAIN_REFS(0x27U, true, 8, 4, 2, 1); // v8: this, v4: ex, v2: y, v1: x
CHECK_REGS_CONTAIN_REFS(0x29U, true, 8, 4, 2, 1); // v8: this, v4: ex, v2: y, v1: x
CHECK_REGS_CONTAIN_REFS(0x2cU, true, 8, 4, 2, 1); // v8: this, v4: ex, v2: y, v1: x
// Note that it is OK for a compiler to not have a dex map at these two dex PCs because
// a goto is not necessarily a safepoint.
CHECK_REGS_CONTAIN_REFS(0x2fU, false, 8, 4, 3, 2, 1); // v8: this, v4: ex, v3: y, v2: y, v1: x
CHECK_REGS_CONTAIN_REFS(0x32U, false, 8, 3, 2, 1, 0); // v8: this, v3: y, v2: y, v1: x, v0: ex
}
return true;
}
};
// Dex instructions for the function 'f' in ReferenceMap.java
// Virtual methods -
// #0 : (in LReferenceMap;)
// name : 'f'
// type : '()Ljava/lang/Object;'
// access : 0x0000 ()
// code -
// registers : 9
// ins : 1
// outs : 2
// insns size : 51 16-bit code units
// |[0001e8] ReferenceMap.f:()Ljava/lang/Object;
// |0000: const/4 v4, #int 2 // #2
// |0001: const/4 v7, #int 0 // #0
// |0002: const/4 v6, #int 1 // #1
//
// 0:[Unknown],1:[Unknown],2:[Unknown],3:[Unknown],4:[32-bit Constant: 2],5:[Unknown],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap],
// |0003: new-array v1, v4, [Ljava/lang/Object; // type@0007
// |0005: const/4 v2, #int 0 // #0
// 0:[Unknown],1:[Reference: java.lang.Object[]],2:[Zero],3:[Unknown],4:[32-bit Constant: 2],5:[Unknown],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap],
// |0006: new-instance v3, Ljava/lang/Object; // type@0003
// [Unknown],1:[Reference: java.lang.Object[]],2:[Zero],3:[Uninitialized Reference: java.lang.Object],4:[32-bit Constant: 2],5:[Unknown],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap],
// |0008: +invoke-object-init/range {}, Ljava/lang/Object;.<init>:()V // method@0005
// |000b: const/4 v4, #int 2 // #2
// 0:[Unknown],1:[Reference: java.lang.Object[]],2:[Zero],3:[Reference: java.lang.Object],4:[32-bit Constant: 2],5:[Unknown],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap],
// |000c: aput-object v3, v1, v4
// 0:[Unknown],1:[Reference: java.lang.Object[]],2:[Zero],3:[Reference: java.lang.Object],4:[32-bit Constant: 2],5:[Unknown],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap],
// |000e: aput-object v3, v1, v6
// 0:[Unknown],1:[Reference: java.lang.Object[]],2:[Zero],3:[Reference: java.lang.Object],4:[32-bit Constant: 2],5:[Unknown],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap],
// |0010: +invoke-virtual-quick {v8, v7}, [000c] // vtable #000c
// 0:[Conflict],1:[Conflict],2:[Conflict],3:[Reference: java.lang.Object],4:[Conflict],5:[Conflict],6:[Conflict],7:[Conflict],8:[Conflict],
// |0013: return-object v3
// |0014: move-exception v0
// 0:[Reference: java.lang.Exception],1:[Reference: java.lang.Object[]],2:[Reference: java.lang.Object],3:[Conflict],4:[32-bit Constant: 2],5:[Unknown],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap],
// |0015: if-nez v2, 001f // +000a
// |0017: const/4 v4, #int 1 // #1
// 0:[Reference: java.lang.Exception],1:[Reference: java.lang.Object[]],2:[Reference: java.lang.Object],3:[Conflict],4:[32-bit Constant: 1],5:[Unknown],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap],
// |0018: new-instance v5, Ljava/lang/Object; // type@0003
// 0:[Reference: java.lang.Exception],1:[Reference: java.lang.Object[]],2:[Reference: java.lang.Object],3:[Conflict],4:[32-bit Constant: 1],5:[Uninitialized Reference: java.lang.Object],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap],
// |001a: +invoke-object-init/range {}, Ljava/lang/Object;.<init>:()V // method@0005
// 0:[Reference: java.lang.Exception],1:[Reference: java.lang.Object[]],2:[Reference: java.lang.Object],3:[Conflict],4:[32-bit Constant: 1],5:[Reference: java.lang.Object],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap],
// |001d: aput-object v5, v1, v4
// 0:[Reference: java.lang.Exception],1:[Reference: java.lang.Object[]],2:[Reference: java.lang.Object],3:[Conflict],4:[32-bit Constant: 2],5:[Conflict],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap],
// |001f: aput-object v2, v1, v6
// 0:[Reference: java.lang.Exception],1:[Reference: java.lang.Object[]],2:[Reference: java.lang.Object],3:[Conflict],4:[32-bit Constant: 2],5:[Conflict],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap],
// |0021: +invoke-virtual-quick {v8, v7}, [000c] // vtable #000c
// |0024: move-object v3, v2
// 0:[Reference: java.lang.Exception],1:[Reference: java.lang.Object[]],2:[Reference: java.lang.Object],3:[Reference: java.lang.Object],4:[32-bit Constant: 2],5:[Conflict],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap],
// |0025: goto 0013 // -0012
// |0026: move-exception v4
// 0:[Conflict],1:[Reference: java.lang.Object[]],2:[Reference: java.lang.Object],3:[Conflict],4:[Reference: java.lang.Throwable],5:[Conflict],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap],
// |0027: aput-object v2, v1, v6
// 0:[Conflict],1:[Reference: java.lang.Object[]],2:[Reference: java.lang.Object],3:[Conflict],4:[Reference: java.lang.Throwable],5:[Conflict],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap],
// |0029: +invoke-virtual-quick {v8, v7}, [000c] // vtable #000c
// 0:[Conflict],1:[Reference: java.lang.Object[]],2:[Reference: java.lang.Object],3:[Conflict],4:[Reference: java.lang.Throwable],5:[Conflict],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap],
// |002c: throw v4
// |002d: move-exception v4
// |002e: move-object v2, v3
// 0:[Unknown],1:[Reference: java.lang.Object[]],2:[Reference: java.lang.Object],3:[Reference: java.lang.Object],4:[Reference: java.lang.Throwable],5:[Unknown],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap],
// |002f: goto 0027 // -0008
// |0030: move-exception v0
// |0031: move-object v2, v3
// 0:[Reference: java.lang.Exception],1:[Reference: java.lang.Object[]],2:[Reference: java.lang.Object],3:[Reference: java.lang.Object],4:[32-bit Constant: 2],5:[Unknown],6:[32-bit Constant: 1],7:[Zero],8:[Reference: ReferenceMap],
// |0032: goto 0015 // -001d
// catches : 3
// 0x0006 - 0x000b
// Ljava/lang/Exception; -> 0x0014
// <any> -> 0x0026
// 0x000c - 0x000e
// Ljava/lang/Exception; -> 0x0030
// <any> -> 0x002d
// 0x0018 - 0x001f
// <any> -> 0x0026
// positions :
// 0x0003 line=8
// 0x0005 line=9
// 0x0006 line=11
// 0x000b line=12
// 0x000e line=18
// 0x0010 line=19
// 0x0013 line=21
// 0x0014 line=13
// 0x0015 line=14
// 0x0017 line=15
// 0x001f line=18
// 0x0021 line=19
// 0x0025 line=20
// 0x0026 line=18
// 0x0029 line=19
// 0x002d line=18
// 0x0030 line=13
// locals :
// 0x0006 - 0x000b reg=2 y Ljava/lang/Object;
// 0x000b - 0x0013 reg=3 y Ljava/lang/Object;
// 0x0014 - 0x0015 reg=2 y Ljava/lang/Object;
// 0x0015 - 0x0026 reg=0 ex Ljava/lang/Exception;
// 0x002d - 0x0032 reg=3 y Ljava/lang/Object;
// 0x0005 - 0x0033 reg=1 x [Ljava/lang/Object;
// 0x0032 - 0x0033 reg=2 y Ljava/lang/Object;
// 0x0000 - 0x0033 reg=8 this LReferenceMap;
extern "C" JNIEXPORT jint JNICALL Java_Main_refmap(JNIEnv*, jobject, jint count) {
// Visitor
ScopedObjectAccess soa(Thread::Current());
ReferenceMap2Visitor mapper(soa.Self());
mapper.WalkStack();
return count + 1;
}
} // namespace art
|
