stack_walk_jni.cc revision 1c83cbc4a817acbd7f9abb5b29a2d418a958e6a1 
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#include <memory>
19
20#include "class_linker.h"
21#include "gc_map.h"
22#include "mirror/art_method-inl.h"
23#include "mirror/class-inl.h"
24#include "mirror/object_array-inl.h"
25#include "mirror/object-inl.h"
26#include "jni.h"
27#include "scoped_thread_state_change.h"
28
29namespace art {
30
31#define REG(reg_bitmap, reg) \
32    (((reg) < m->GetCodeItem()->registers_size_) && \
33     ((*((reg_bitmap) + (reg)/8) >> ((reg) % 8) ) & 0x01))
34
35#define CHECK_REGS(...) if (!IsShadowFrame()) { \
36    int t[] = {__VA_ARGS__}; \
37    int t_size = sizeof(t) / sizeof(*t); \
38    for (int i = 0; i < t_size; ++i) \
39      CHECK(REG(reg_bitmap, t[i])) << "Error: Reg " << i << " is not in RegisterMap"; \
40  }
41
42static int gJava_StackWalk_refmap_calls = 0;
43
44struct TestReferenceMapVisitor : public StackVisitor {
45  explicit TestReferenceMapVisitor(Thread* thread)
46      SHARED_LOCKS_REQUIRED(Locks::mutator_lock_)
47      : StackVisitor(thread, NULL) {
48  }
49
50  bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
51    mirror::ArtMethod* m = GetMethod();
52    CHECK(m != NULL);
53    LOG(INFO) << "At " << PrettyMethod(m, false);
54
55    if (m->IsCalleeSaveMethod() || m->IsNative()) {
56      LOG(WARNING) << "no PC for " << PrettyMethod(m);
57      CHECK_EQ(GetDexPc(), DexFile::kDexNoIndex);
58      return true;
59    }
60    const uint8_t* reg_bitmap = NULL;
61    if (!IsShadowFrame()) {
62      NativePcOffsetToReferenceMap map(m->GetNativeGcMap());
63      reg_bitmap = map.FindBitMap(GetNativePcOffset());
64    }
65    StringPiece m_name(m->GetName());
66
67    // Given the method name and the number of times the method has been called,
68    // we know the Dex registers with live reference values. Assert that what we
69    // find is what is expected.
70    if (m_name == "f") {
71      if (gJava_StackWalk_refmap_calls == 1) {
72        CHECK_EQ(1U, GetDexPc());
73        CHECK_REGS(1);
74      } else {
75        CHECK_EQ(gJava_StackWalk_refmap_calls, 2);
76        CHECK_EQ(5U, GetDexPc());
77        CHECK_REGS(1);
78      }
79    } else if (m_name == "g") {
80      if (gJava_StackWalk_refmap_calls == 1) {
81        CHECK_EQ(0xcU, GetDexPc());
82        CHECK_REGS(0, 2);  // Note that v1 is not in the minimal root set
83      } else {
84        CHECK_EQ(gJava_StackWalk_refmap_calls, 2);
85        CHECK_EQ(0xcU, GetDexPc());
86        CHECK_REGS(0, 2);
87      }
88    } else if (m_name == "shlemiel") {
89      if (gJava_StackWalk_refmap_calls == 1) {
90        CHECK_EQ(0x380U, GetDexPc());
91        CHECK_REGS(2, 4, 5, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 21, 25);
92      } else {
93        CHECK_EQ(gJava_StackWalk_refmap_calls, 2);
94        CHECK_EQ(0x380U, GetDexPc());
95        CHECK_REGS(2, 4, 5, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 19, 21, 25);
96      }
97    }
98
99    return true;
100  }
101};
102
103extern "C" JNIEXPORT jint JNICALL Java_Main_stackmap(JNIEnv*, jobject, jint count) {
104  ScopedObjectAccess soa(Thread::Current());
105  CHECK_EQ(count, 0);
106  gJava_StackWalk_refmap_calls++;
107
108  // Visitor
109  TestReferenceMapVisitor mapper(soa.Self());
110  mapper.WalkStack();
111
112  return count + 1;
113}
114
115extern "C" JNIEXPORT jint JNICALL Java_Main_refmap2(JNIEnv*, jobject, jint count) {
116  ScopedObjectAccess soa(Thread::Current());
117  gJava_StackWalk_refmap_calls++;
118
119  // Visitor
120  TestReferenceMapVisitor mapper(soa.Self());
121  mapper.WalkStack();
122
123  return count + 1;
124}
125
126}  // namespace art
127