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 <stdio.h>
18
19 #include "UniquePtr.h"
20 #include "class_linker.h"
21 #include "gc_map.h"
22 #include "mirror/art_method.h"
23 #include "mirror/art_method-inl.h"
24 #include "mirror/class-inl.h"
25 #include "mirror/object_array-inl.h"
26 #include "mirror/object-inl.h"
27 #include "object_utils.h"
28 #include "jni.h"
29 #include "scoped_thread_state_change.h"
30
31 namespace art {
32
33 #define REG(mh, reg_bitmap, reg) \
34 (((reg) < mh.GetCodeItem()->registers_size_) && \
35 ((*((reg_bitmap) + (reg)/8) >> ((reg) % 8) ) & 0x01))
36
37 #define CHECK_REGS(...) if (!IsShadowFrame()) { \
38 int t[] = {__VA_ARGS__}; \
39 int t_size = sizeof(t) / sizeof(*t); \
40 for (int i = 0; i < t_size; ++i) \
41 CHECK(REG(mh, reg_bitmap, t[i])) << "Error: Reg " << i << " is not in RegisterMap"; \
42 }
43
44 static int gJava_StackWalk_refmap_calls = 0;
45
46 struct TestReferenceMapVisitor : public StackVisitor {
47 explicit TestReferenceMapVisitor(Thread* thread)
SHARED_LOCKS_REQUIREDart::TestReferenceMapVisitor48 SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
49 : StackVisitor(thread, NULL) {
50 }
51
VisitFrameart::TestReferenceMapVisitor52 bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
53 mirror::ArtMethod* m = GetMethod();
54 CHECK(m != NULL);
55 LOG(INFO) << "At " << PrettyMethod(m, false);
56
57 if (m->IsCalleeSaveMethod() || m->IsNative()) {
58 LOG(WARNING) << "no PC for " << PrettyMethod(m);
59 CHECK_EQ(GetDexPc(), DexFile::kDexNoIndex);
60 return true;
61 }
62 const uint8_t* reg_bitmap = NULL;
63 if (!IsShadowFrame()) {
64 NativePcOffsetToReferenceMap map(m->GetNativeGcMap());
65 reg_bitmap = map.FindBitMap(GetNativePcOffset());
66 }
67 MethodHelper mh(m);
68 StringPiece m_name(mh.GetName());
69
70 // Given the method name and the number of times the method has been called,
71 // we know the Dex registers with live reference values. Assert that what we
72 // find is what is expected.
73 if (m_name == "f") {
74 if (gJava_StackWalk_refmap_calls == 1) {
75 CHECK_EQ(1U, GetDexPc());
76 CHECK_REGS(1);
77 } else {
78 CHECK_EQ(gJava_StackWalk_refmap_calls, 2);
79 CHECK_EQ(5U, GetDexPc());
80 CHECK_REGS(1);
81 }
82 } else if (m_name == "g") {
83 if (gJava_StackWalk_refmap_calls == 1) {
84 CHECK_EQ(0xcU, GetDexPc());
85 CHECK_REGS(0, 2); // Note that v1 is not in the minimal root set
86 } else {
87 CHECK_EQ(gJava_StackWalk_refmap_calls, 2);
88 CHECK_EQ(0xcU, GetDexPc());
89 CHECK_REGS(0, 2);
90 }
91 } else if (m_name == "shlemiel") {
92 if (gJava_StackWalk_refmap_calls == 1) {
93 CHECK_EQ(0x380U, GetDexPc());
94 CHECK_REGS(2, 4, 5, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 21, 25);
95 } else {
96 CHECK_EQ(gJava_StackWalk_refmap_calls, 2);
97 CHECK_EQ(0x380U, GetDexPc());
98 CHECK_REGS(2, 4, 5, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 21, 25);
99 }
100 }
101 LOG(INFO) << reinterpret_cast<const void*>(reg_bitmap);
102
103 return true;
104 }
105 };
106
Java_StackWalk_refmap(JNIEnv *,jobject,jint count)107 extern "C" JNIEXPORT jint JNICALL Java_StackWalk_refmap(JNIEnv*, jobject, jint count) {
108 ScopedObjectAccess soa(Thread::Current());
109 CHECK_EQ(count, 0);
110 gJava_StackWalk_refmap_calls++;
111
112 // Visitor
113 TestReferenceMapVisitor mapper(soa.Self());
114 mapper.WalkStack();
115
116 return count + 1;
117 }
118
Java_StackWalk2_refmap2(JNIEnv *,jobject,jint count)119 extern "C" JNIEXPORT jint JNICALL Java_StackWalk2_refmap2(JNIEnv*, jobject, jint count) {
120 ScopedObjectAccess soa(Thread::Current());
121 gJava_StackWalk_refmap_calls++;
122
123 // Visitor
124 TestReferenceMapVisitor mapper(soa.Self());
125 mapper.WalkStack();
126
127 return count + 1;
128 }
129
130 } // namespace art
131