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/*
* Copyright (C) 2015 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.h"
#include <android-base/logging.h>
#include "arch/context.h"
#include "base/mutex.h"
#include "dex/dex_file-inl.h"
#include "jni/jni_internal.h"
#include "mirror/class-inl.h"
#include "nth_caller_visitor.h"
#include "oat_file.h"
#include "oat_quick_method_header.h"
#include "runtime.h"
#include "scoped_thread_state_change-inl.h"
#include "stack.h"
#include "thread-current-inl.h"
namespace art {
static bool asserts_enabled = true;
// public static native void disableStackFrameAsserts();
// Note: to globally disable asserts in unsupported configurations.
extern "C" JNIEXPORT void JNICALL Java_Main_disableStackFrameAsserts(JNIEnv* env ATTRIBUTE_UNUSED,
jclass cls ATTRIBUTE_UNUSED) {
asserts_enabled = false;
}
static jboolean IsInterpreted(JNIEnv* env, jclass, size_t level) {
ScopedObjectAccess soa(env);
NthCallerVisitor caller(soa.Self(), level, false);
caller.WalkStack();
CHECK(caller.caller != nullptr);
bool is_shadow_frame = (caller.GetCurrentShadowFrame() != nullptr);
bool is_nterp_frame = (caller.GetCurrentQuickFrame() != nullptr) &&
(caller.GetCurrentOatQuickMethodHeader()->IsNterpMethodHeader());
return (is_shadow_frame || is_nterp_frame) ? JNI_TRUE : JNI_FALSE;
}
// public static native boolean isInterpreted();
extern "C" JNIEXPORT jboolean JNICALL Java_Main_isInterpreted(JNIEnv* env, jclass klass) {
return IsInterpreted(env, klass, 1);
}
// public static native boolean isInterpreted(int depth);
extern "C" JNIEXPORT jboolean JNICALL Java_Main_isInterpretedAt(JNIEnv* env,
jclass klass,
jint depth) {
return IsInterpreted(env, klass, depth);
}
// public static native boolean isInterpretedFunction(String smali);
static bool IsMethodInterpreted(Thread* self,
const ArtMethod* goal,
const bool require_deoptable,
/* out */ bool* method_is_interpreted)
REQUIRES_SHARED(Locks::mutator_lock_) {
*method_is_interpreted = true;
bool method_found = false;
bool prev_was_runtime = true;
StackVisitor::WalkStack(
[&](const art::StackVisitor* stack_visitor) REQUIRES_SHARED(Locks::mutator_lock_) {
if (goal == stack_visitor->GetMethod()) {
*method_is_interpreted =
(require_deoptable && prev_was_runtime) || stack_visitor->IsShadowFrame();
method_found = true;
return false;
}
prev_was_runtime = stack_visitor->GetMethod()->IsRuntimeMethod();
return true;
},
self,
/* context= */ nullptr,
art::StackVisitor::StackWalkKind::kIncludeInlinedFrames);
return method_found;
}
// TODO Remove 'require_deoptimizable' option once we have deoptimization through runtime frames.
extern "C" JNIEXPORT jboolean JNICALL Java_Main_isInterpretedFunction(
JNIEnv* env, jclass klass ATTRIBUTE_UNUSED, jobject method, jboolean require_deoptimizable) {
// Return false if this seems to not be an ART runtime.
if (Runtime::Current() == nullptr) {
return JNI_FALSE;
}
if (method == nullptr) {
env->ThrowNew(env->FindClass("java/lang/NullPointerException"), "method is null!");
return JNI_FALSE;
}
jmethodID id = env->FromReflectedMethod(method);
if (id == nullptr) {
env->ThrowNew(env->FindClass("java/lang/Error"), "Unable to interpret method argument!");
return JNI_FALSE;
}
{
ScopedObjectAccess soa(env);
ArtMethod* goal = jni::DecodeArtMethod(id);
bool is_interpreted;
if (!IsMethodInterpreted(soa.Self(), goal, require_deoptimizable, &is_interpreted)) {
env->ThrowNew(env->FindClass("java/lang/Error"), "Unable to find given method in stack!");
return JNI_FALSE;
}
bool enters_interpreter = Runtime::Current()->GetClassLinker()->IsQuickToInterpreterBridge(
goal->GetEntryPointFromQuickCompiledCode());
return (is_interpreted || enters_interpreter);
}
}
// public static native void assertIsInterpreted();
extern "C" JNIEXPORT void JNICALL Java_Main_assertIsInterpreted(JNIEnv* env, jclass klass) {
if (asserts_enabled) {
CHECK(Java_Main_isInterpreted(env, klass));
}
}
static jboolean IsManaged(JNIEnv* env, jclass, size_t level) {
ScopedObjectAccess soa(env);
NthCallerVisitor caller(soa.Self(), level, false);
caller.WalkStack();
CHECK(caller.caller != nullptr);
return caller.GetCurrentShadowFrame() != nullptr ? JNI_FALSE : JNI_TRUE;
}
// public static native boolean isManaged();
extern "C" JNIEXPORT jboolean JNICALL Java_Main_isManaged(JNIEnv* env, jclass cls) {
return IsManaged(env, cls, 1);
}
// public static native void assertIsManaged();
extern "C" JNIEXPORT void JNICALL Java_Main_assertIsManaged(JNIEnv* env, jclass cls) {
if (asserts_enabled) {
CHECK(Java_Main_isManaged(env, cls));
}
}
// public static native boolean isCallerInterpreted();
extern "C" JNIEXPORT jboolean JNICALL Java_Main_isCallerInterpreted(JNIEnv* env, jclass klass) {
return IsInterpreted(env, klass, 2);
}
// public static native void assertCallerIsInterpreted();
extern "C" JNIEXPORT void JNICALL Java_Main_assertCallerIsInterpreted(JNIEnv* env, jclass klass) {
if (asserts_enabled) {
CHECK(Java_Main_isCallerInterpreted(env, klass));
}
}
// public static native boolean isCallerManaged();
extern "C" JNIEXPORT jboolean JNICALL Java_Main_isCallerManaged(JNIEnv* env, jclass cls) {
return IsManaged(env, cls, 2);
}
// public static native void assertCallerIsManaged();
extern "C" JNIEXPORT void JNICALL Java_Main_assertCallerIsManaged(JNIEnv* env, jclass cls) {
if (asserts_enabled) {
CHECK(Java_Main_isCallerManaged(env, cls));
}
}
extern "C" JNIEXPORT jobject JNICALL Java_Main_getThisOfCaller(
JNIEnv* env, jclass cls ATTRIBUTE_UNUSED) {
ScopedObjectAccess soa(env);
std::unique_ptr<art::Context> context(art::Context::Create());
jobject result = nullptr;
StackVisitor::WalkStack(
[&](const art::StackVisitor* stack_visitor) REQUIRES_SHARED(Locks::mutator_lock_) {
// Discard stubs and Main.getThisOfCaller and methods without vreg info.
if (stack_visitor->GetMethod() == nullptr ||
stack_visitor->GetMethod()->IsNative() ||
(stack_visitor->GetCurrentShadowFrame() == nullptr &&
!Runtime::Current()->IsAsyncDeoptimizeable(stack_visitor->GetOuterMethod(),
stack_visitor->GetCurrentQuickFramePc()))) {
return true;
}
result = soa.AddLocalReference<jobject>(stack_visitor->GetThisObject());
return false;
},
soa.Self(),
context.get(),
art::StackVisitor::StackWalkKind::kIncludeInlinedFrames);
return result;
}
} // namespace art
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