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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 "scoped_heap_lock.h"
#include "scoped_thread_list_lock.h"
#include "thread_list.h"
#include "JniConstants.h" // Last to avoid problems with LOG redefinition.
namespace art {
static jobject GetThreadStack(JNIEnv* env, jobject javaThread) {
ScopedHeapLock heap_lock;
ScopedThreadListLock thread_list_lock;
Thread* thread = Thread::FromManagedThread(env, javaThread);
return (thread != NULL) ? GetThreadStack(env, thread) : 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;
}
static 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();
DCHECK(callerCaller != NULL);
const Object* cl = callerCaller->GetDeclaringClass()->GetClassLoader();
return AddLocalReference<jobject>(env, cl);
}
static jobject VMStack_getClosestUserClassLoader(JNIEnv* env, jclass, jobject javaBootstrap, jobject javaSystem) {
struct ClosestUserClassLoaderVisitor : public Thread::StackVisitor {
ClosestUserClassLoaderVisitor(Object* bootstrap, Object* system)
: bootstrap(bootstrap), system(system), class_loader(NULL) {}
bool VisitFrame(const Frame& f, uintptr_t) {
DCHECK(class_loader == NULL);
Class* c = f.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;
};
Object* bootstrap = Decode<Object*>(env, javaBootstrap);
Object* system = Decode<Object*>(env, javaSystem);
ClosestUserClassLoaderVisitor visitor(bootstrap, system);
Thread::Current()->WalkStack(&visitor);
return AddLocalReference<jobject>(env, visitor.class_loader);
}
static 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();
DCHECK(callerCallerCaller != NULL);
Class* c = callerCallerCaller->GetDeclaringClass();
return AddLocalReference<jclass>(env, c);
}
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) {
jniRegisterNativeMethods(env, "dalvik/system/VMStack", gMethods, NELEM(gMethods));
}
} // namespace art
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