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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
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
#include "class_loader.h"
#include "jni_internal.h"
#include "nth_caller_visitor.h"
#include "object.h"
#include "scoped_thread_state_change.h"
#include "thread_list.h"
namespace art {
static jobject GetThreadStack(JNIEnv* env, jobject peer) {
bool timeout;
Thread* self = Thread::Current();
if (env->IsSameObject(peer, self->GetPeer())) {
ScopedObjectAccess soa(env);
return self->CreateInternalStackTrace(soa);
// Suspend thread to build stack trace.
Thread* thread = Thread::SuspendForDebugger(peer, true, &timeout);
if (thread != NULL) {
jobject trace;
ScopedObjectAccess soa(env);
trace = thread->CreateInternalStackTrace(soa);
// Restart suspended thread.
Runtime::Current()->GetThreadList()->Resume(thread, true);
return trace;
} else {
if (timeout) {
LOG(ERROR) << "Trying to get thread's stack failed as the thread failed to suspend within a "
"generous timeout.";
return NULL;
static 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;
// Returns the defining class loader of the caller's caller.
static jobject VMStack_getCallingClassLoader(JNIEnv* env, jclass) {
ScopedObjectAccess soa(env);
NthCallerVisitor visitor(soa.Self()->GetManagedStack(), soa.Self()->GetTraceStack(), 2);
return soa.AddLocalReference<jobject>(visitor.caller->GetDeclaringClass()->GetClassLoader());
static jobject VMStack_getClosestUserClassLoader(JNIEnv* env, jclass, jobject javaBootstrap, jobject javaSystem) {
struct ClosestUserClassLoaderVisitor : public StackVisitor {
ClosestUserClassLoaderVisitor(const ManagedStack* stack,
const std::vector<TraceStackFrame>* trace_stack,
Object* bootstrap, Object* system)
: StackVisitor(stack, trace_stack, NULL),
bootstrap(bootstrap), system(system), class_loader(NULL) {}
bool VisitFrame() {
DCHECK(class_loader == NULL);
Class* c = GetMethod()->GetDeclaringClass();
Object* cl = c->GetClassLoader();
if (cl != NULL && cl != bootstrap && cl != system) {
class_loader = cl;
return false;
return true;
Object* bootstrap;
Object* system;
Object* class_loader;
ScopedObjectAccess soa(env);
Object* bootstrap = soa.Decode<Object*>(javaBootstrap);
Object* system = soa.Decode<Object*>(javaSystem);
ClosestUserClassLoaderVisitor visitor(soa.Self()->GetManagedStack(), soa.Self()->GetTraceStack(),
bootstrap, system);
return soa.AddLocalReference<jobject>(visitor.class_loader);
// Returns the class of the caller's caller's caller.
static jclass VMStack_getStackClass2(JNIEnv* env, jclass) {
ScopedObjectAccess soa(env);
NthCallerVisitor visitor(soa.Self()->GetManagedStack(), soa.Self()->GetTraceStack(), 3);
return soa.AddLocalReference<jclass>(visitor.caller->GetDeclaringClass());
static 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;"),
void register_dalvik_system_VMStack(JNIEnv* env) {
} // namespace art