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/*
* Copyright (C) 2008 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 "jni_internal.h"
#include "class_loader.h"
#include "object.h"
#include "thread_list.h"
#include "JniConstants.h" // Last to avoid problems with LOG redefinition.
namespace art {
namespace {
class StackGetter {
public:
StackGetter(JNIEnv* env, Thread* thread) : env_(env), thread_(thread), trace_(NULL) {
}
static void Callback(void* arg) {
reinterpret_cast<StackGetter*>(arg)->Callback();
}
jobject GetTrace() {
return trace_;
}
private:
void Callback() {
trace_ = thread_->CreateInternalStackTrace(env_);
}
JNIEnv* env_;
Thread* thread_;
jobject trace_;
};
jobject GetThreadStack(JNIEnv* env, jobject javaThread) {
Thread* thread = Thread::FromManagedThread(env, javaThread);
if (thread == NULL) {
return NULL;
}
ThreadList* thread_list = Runtime::Current()->GetThreadList();
StackGetter stack_getter(env, thread);
thread_list->RunWhileSuspended(thread, StackGetter::Callback, &stack_getter);
return stack_getter.GetTrace();
}
jint VMStack_fillStackTraceElements(JNIEnv* env, jclass, jobject javaThread, jobjectArray javaSteArray) {
jobject trace = GetThreadStack(env, javaThread);
if (trace == NULL) {
return 0;
}
int32_t depth;
Thread::InternalStackTraceToStackTraceElementArray(env, trace, javaSteArray, &depth);
return depth;
}
jobject VMStack_getCallingClassLoader(JNIEnv* env, jclass) {
// Returns the defining class loader of the caller's caller.
// TODO: need SmartFrame (Thread::WalkStack-like iterator).
Frame frame = Thread::Current()->GetTopOfStack();
frame.Next();
frame.Next();
Method* callerCaller = frame.GetMethod();
const Object* cl = callerCaller->GetDeclaringClass()->GetClassLoader();
return AddLocalReference<jobject>(env, cl);
}
jobject VMStack_getClosestUserClassLoader(JNIEnv* env, jclass, jobject javaBootstrap, jobject javaSystem) {
Thread* self = Thread::Current();
Object* bootstrap = Decode<Object*>(env, javaBootstrap);
Object* system = Decode<Object*>(env, javaSystem);
// TODO: need SmartFrame (Thread::WalkStack-like iterator).
for (Frame frame = self->GetTopOfStack(); frame.HasNext(); frame.Next()) {
Class* c = frame.GetMethod()->GetDeclaringClass();
Object* cl = const_cast<ClassLoader*>(c->GetClassLoader());
if (cl != bootstrap && cl != system) {
return AddLocalReference<jobject>(env, cl);
}
}
return NULL;
}
jclass VMStack_getStackClass2(JNIEnv* env, jclass) {
// Returns the class of the caller's caller's caller.
// TODO: need SmartFrame (Thread::WalkStack-like iterator).
Frame frame = Thread::Current()->GetTopOfStack();
frame.Next();
frame.Next();
frame.Next();
Method* callerCallerCaller = frame.GetMethod();
Class* c = callerCallerCaller->GetDeclaringClass();
return AddLocalReference<jclass>(env, c);
}
jobjectArray VMStack_getThreadStackTrace(JNIEnv* env, jclass, jobject javaThread) {
jobject trace = GetThreadStack(env, javaThread);
if (trace == NULL) {
return NULL;
}
return Thread::InternalStackTraceToStackTraceElementArray(env, trace);
}
static JNINativeMethod gMethods[] = {
NATIVE_METHOD(VMStack, fillStackTraceElements, "(Ljava/lang/Thread;[Ljava/lang/StackTraceElement;)I"),
NATIVE_METHOD(VMStack, getCallingClassLoader, "()Ljava/lang/ClassLoader;"),
NATIVE_METHOD(VMStack, getClosestUserClassLoader, "(Ljava/lang/ClassLoader;Ljava/lang/ClassLoader;)Ljava/lang/ClassLoader;"),
NATIVE_METHOD(VMStack, getStackClass2, "()Ljava/lang/Class;"),
NATIVE_METHOD(VMStack, getThreadStackTrace, "(Ljava/lang/Thread;)[Ljava/lang/StackTraceElement;"),
};
} // namespace
void register_dalvik_system_VMStack(JNIEnv* env) {
jniRegisterNativeMethods(env, "dalvik/system/VMStack", gMethods, NELEM(gMethods));
}
} // namespace art
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