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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 "nth_caller_visitor.h"
#include "mirror/art_method-inl.h"
#include "mirror/class-inl.h"
#include "mirror/class_loader.h"
#include "mirror/object-inl.h"
#include "scoped_fast_native_object_access.h"
#include "scoped_thread_state_change.h"
#include "thread_list.h"
namespace art {
static jobject GetThreadStack(const ScopedFastNativeObjectAccess& soa, jobject peer)
SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
jobject trace = nullptr;
if (soa.Decode<mirror::Object*>(peer) == soa.Self()->GetPeer()) {
trace = soa.Self()->CreateInternalStackTrace<false>(soa);
} else {
// Suspend thread to build stack trace.
soa.Self()->TransitionFromRunnableToSuspended(kNative);
bool timed_out;
Thread* thread = ThreadList::SuspendThreadByPeer(peer, true, false, &timed_out);
if (thread != nullptr) {
// Must be runnable to create returned array.
CHECK_EQ(soa.Self()->TransitionFromSuspendedToRunnable(), kNative);
trace = thread->CreateInternalStackTrace<false>(soa);
soa.Self()->TransitionFromRunnableToSuspended(kNative);
// Restart suspended thread.
Runtime::Current()->GetThreadList()->Resume(thread, false);
} else {
if (timed_out) {
LOG(ERROR) << "Trying to get thread's stack failed as the thread failed to suspend within a "
"generous timeout.";
}
}
CHECK_EQ(soa.Self()->TransitionFromSuspendedToRunnable(), kNative);
}
return trace;
}
static jint VMStack_fillStackTraceElements(JNIEnv* env, jclass, jobject javaThread,
jobjectArray javaSteArray) {
ScopedFastNativeObjectAccess soa(env);
jobject trace = GetThreadStack(soa, javaThread);
if (trace == nullptr) {
return 0;
}
int32_t depth;
Thread::InternalStackTraceToStackTraceElementArray(soa, trace, javaSteArray, &depth);
return depth;
}
// Returns the defining class loader of the caller's caller.
static jobject VMStack_getCallingClassLoader(JNIEnv* env, jclass) {
ScopedFastNativeObjectAccess soa(env);
NthCallerVisitor visitor(soa.Self(), 2);
visitor.WalkStack();
return soa.AddLocalReference<jobject>(visitor.caller->GetDeclaringClass()->GetClassLoader());
}
static jobject VMStack_getClosestUserClassLoader(JNIEnv* env, jclass, jobject javaBootstrap,
jobject javaSystem) {
struct ClosestUserClassLoaderVisitor : public StackVisitor {
ClosestUserClassLoaderVisitor(Thread* thread, mirror::Object* bootstrap, mirror::Object* system)
: StackVisitor(thread, NULL), bootstrap(bootstrap), system(system), class_loader(NULL) {}
bool VisitFrame() SHARED_LOCKS_REQUIRED(Locks::mutator_lock_) {
DCHECK(class_loader == NULL);
mirror::Class* c = GetMethod()->GetDeclaringClass();
mirror::Object* cl = c->GetClassLoader();
if (cl != NULL && cl != bootstrap && cl != system) {
class_loader = cl;
return false;
}
return true;
}
mirror::Object* bootstrap;
mirror::Object* system;
mirror::Object* class_loader;
};
ScopedFastNativeObjectAccess soa(env);
mirror::Object* bootstrap = soa.Decode<mirror::Object*>(javaBootstrap);
mirror::Object* system = soa.Decode<mirror::Object*>(javaSystem);
ClosestUserClassLoaderVisitor visitor(soa.Self(), bootstrap, system);
visitor.WalkStack();
return soa.AddLocalReference<jobject>(visitor.class_loader);
}
// Returns the class of the caller's caller's caller.
static jclass VMStack_getStackClass2(JNIEnv* env, jclass) {
ScopedFastNativeObjectAccess soa(env);
NthCallerVisitor visitor(soa.Self(), 3);
visitor.WalkStack();
return soa.AddLocalReference<jclass>(visitor.caller->GetDeclaringClass());
}
static jobjectArray VMStack_getThreadStackTrace(JNIEnv* env, jclass, jobject javaThread) {
ScopedFastNativeObjectAccess soa(env);
jobject trace = GetThreadStack(soa, javaThread);
if (trace == nullptr) {
return nullptr;
}
return Thread::InternalStackTraceToStackTraceElementArray(soa, 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) {
REGISTER_NATIVE_METHODS("dalvik/system/VMStack");
}
} // namespace art
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