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      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 #include "ti_macros.h"
     28 
     29 namespace art {
     30 
     31 jobject GetJavaField(jvmtiEnv* jvmti, JNIEnv* env, jclass field_klass, jfieldID f) {
     32   jint mods = 0;
     33   if (JvmtiErrorToException(env, jvmti, jvmti->GetFieldModifiers(field_klass, f, &mods))) {
     34     return nullptr;
     35   }
     36 
     37   bool is_static = (mods & kAccStatic) != 0;
     38   return env->ToReflectedField(field_klass, f, is_static);
     39 }
     40 
     41 jobject GetJavaMethod(jvmtiEnv* jvmti, JNIEnv* env, jmethodID m) {
     42   jint mods = 0;
     43   if (JvmtiErrorToException(env, jvmti, jvmti->GetMethodModifiers(m, &mods))) {
     44     return nullptr;
     45   }
     46 
     47   bool is_static = (mods & kAccStatic) != 0;
     48   jclass method_klass = nullptr;
     49   if (JvmtiErrorToException(env, jvmti, jvmti->GetMethodDeclaringClass(m, &method_klass))) {
     50     return nullptr;
     51   }
     52   jobject res = env->ToReflectedMethod(method_klass, m, is_static);
     53   env->DeleteLocalRef(method_klass);
     54   return res;
     55 }
     56 
     57 jobject GetJavaValueByType(JNIEnv* env, char type, jvalue value) {
     58   std::string name;
     59   switch (type) {
     60     case 'V':
     61       return nullptr;
     62     case '[':
     63     case 'L':
     64       return value.l;
     65     case 'Z':
     66       name = "java/lang/Boolean";
     67       break;
     68     case 'B':
     69       name = "java/lang/Byte";
     70       break;
     71     case 'C':
     72       name = "java/lang/Character";
     73       break;
     74     case 'S':
     75       name = "java/lang/Short";
     76       break;
     77     case 'I':
     78       name = "java/lang/Integer";
     79       break;
     80     case 'J':
     81       name = "java/lang/Long";
     82       break;
     83     case 'F':
     84       name = "java/lang/Float";
     85       break;
     86     case 'D':
     87       name = "java/lang/Double";
     88       break;
     89     default:
     90       LOG(FATAL) << "Unable to figure out type!";
     91       UNREACHABLE();
     92   }
     93   std::ostringstream oss;
     94   oss << "(" << type << ")L" << name << ";";
     95   std::string args = oss.str();
     96   jclass target = env->FindClass(name.c_str());
     97   jmethodID valueOfMethod = env->GetStaticMethodID(target, "valueOf", args.c_str());
     98 
     99   CHECK(valueOfMethod != nullptr) << args;
    100   jobject res = env->CallStaticObjectMethodA(target, valueOfMethod, &value);
    101   env->DeleteLocalRef(target);
    102   return res;
    103 }
    104 
    105 jobject GetJavaValue(jvmtiEnv* jvmtienv, JNIEnv* env, jmethodID m, jvalue value) {
    106   char *fname, *fsig, *fgen;
    107   if (JvmtiErrorToException(env, jvmtienv, jvmtienv->GetMethodName(m, &fname, &fsig, &fgen))) {
    108     return nullptr;
    109   }
    110   std::string type(fsig);
    111   type = type.substr(type.find(')') + 1);
    112   jvmtienv->Deallocate(reinterpret_cast<unsigned char*>(fsig));
    113   jvmtienv->Deallocate(reinterpret_cast<unsigned char*>(fname));
    114   jvmtienv->Deallocate(reinterpret_cast<unsigned char*>(fgen));
    115   return GetJavaValueByType(env, type[0], value);
    116 }
    117 
    118 }  // namespace art
    119