1 /*
2 * Copyright (C) 2016 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 "common_helper.h"
18
19 #include <sstream>
20 #include <string>
21
22 #include "android-base/stringprintf.h"
23 #include "jni.h"
24 #include "jvmti.h"
25
26 #include "jvmti_helper.h"
27
28 namespace art {
29
GetJavaField(jvmtiEnv * jvmti,JNIEnv * env,jclass field_klass,jfieldID f)30 jobject GetJavaField(jvmtiEnv* jvmti, JNIEnv* env, jclass field_klass, jfieldID f) {
31 jint mods = 0;
32 if (JvmtiErrorToException(env, jvmti, jvmti->GetFieldModifiers(field_klass, f, &mods))) {
33 return nullptr;
34 }
35
36 bool is_static = (mods & kAccStatic) != 0;
37 return env->ToReflectedField(field_klass, f, is_static);
38 }
39
GetJavaMethod(jvmtiEnv * jvmti,JNIEnv * env,jmethodID m)40 jobject GetJavaMethod(jvmtiEnv* jvmti, JNIEnv* env, jmethodID m) {
41 jint mods = 0;
42 if (JvmtiErrorToException(env, jvmti, jvmti->GetMethodModifiers(m, &mods))) {
43 return nullptr;
44 }
45
46 bool is_static = (mods & kAccStatic) != 0;
47 jclass method_klass = nullptr;
48 if (JvmtiErrorToException(env, jvmti, jvmti->GetMethodDeclaringClass(m, &method_klass))) {
49 return nullptr;
50 }
51 jobject res = env->ToReflectedMethod(method_klass, m, is_static);
52 env->DeleteLocalRef(method_klass);
53 return res;
54 }
55
GetJavaValueByType(JNIEnv * env,char type,jvalue value)56 jobject GetJavaValueByType(JNIEnv* env, char type, jvalue value) {
57 std::string name;
58 switch (type) {
59 case 'V':
60 return nullptr;
61 case '[':
62 case 'L':
63 return value.l;
64 case 'Z':
65 name = "java/lang/Boolean";
66 break;
67 case 'B':
68 name = "java/lang/Byte";
69 break;
70 case 'C':
71 name = "java/lang/Character";
72 break;
73 case 'S':
74 name = "java/lang/Short";
75 break;
76 case 'I':
77 name = "java/lang/Integer";
78 break;
79 case 'J':
80 name = "java/lang/Long";
81 break;
82 case 'F':
83 name = "java/lang/Float";
84 break;
85 case 'D':
86 name = "java/lang/Double";
87 break;
88 default:
89 LOG(FATAL) << "Unable to figure out type!";
90 return nullptr;
91 }
92 std::ostringstream oss;
93 oss << "(" << type << ")L" << name << ";";
94 std::string args = oss.str();
95 jclass target = env->FindClass(name.c_str());
96 jmethodID valueOfMethod = env->GetStaticMethodID(target, "valueOf", args.c_str());
97
98 CHECK(valueOfMethod != nullptr) << args;
99 jobject res = env->CallStaticObjectMethodA(target, valueOfMethod, &value);
100 env->DeleteLocalRef(target);
101 return res;
102 }
103
GetJavaValue(jvmtiEnv * jvmtienv,JNIEnv * env,jmethodID m,jvalue value)104 jobject GetJavaValue(jvmtiEnv* jvmtienv, JNIEnv* env, jmethodID m, jvalue value) {
105 char *fname, *fsig, *fgen;
106 if (JvmtiErrorToException(env, jvmtienv, jvmtienv->GetMethodName(m, &fname, &fsig, &fgen))) {
107 return nullptr;
108 }
109 std::string type(fsig);
110 type = type.substr(type.find(')') + 1);
111 jvmtienv->Deallocate(reinterpret_cast<unsigned char*>(fsig));
112 jvmtienv->Deallocate(reinterpret_cast<unsigned char*>(fname));
113 jvmtienv->Deallocate(reinterpret_cast<unsigned char*>(fgen));
114 return GetJavaValueByType(env, type[0], value);
115 }
116
117 } // namespace art
118