osr.cc revision 891bc286963892ed96134ca1adb7822737af9710 
1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include "art_method.h"
18#include "jit/jit.h"
19#include "jit/jit_code_cache.h"
20#include "oat_quick_method_header.h"
21#include "scoped_thread_state_change.h"
22#include "stack_map.h"
23
24namespace art {
25
26class OsrVisitor : public StackVisitor {
27 public:
28  explicit OsrVisitor(Thread* thread)
29      SHARED_REQUIRES(Locks::mutator_lock_)
30      : StackVisitor(thread, nullptr, StackVisitor::StackWalkKind::kIncludeInlinedFrames),
31        in_osr_method_(false) {}
32
33  bool VisitFrame() SHARED_REQUIRES(Locks::mutator_lock_) {
34    ArtMethod* m = GetMethod();
35    std::string m_name(m->GetName());
36
37    if ((m_name.compare("$noinline$returnInt") == 0) ||
38        (m_name.compare("$noinline$returnFloat") == 0) ||
39        (m_name.compare("$noinline$returnDouble") == 0) ||
40        (m_name.compare("$noinline$returnLong") == 0) ||
41        (m_name.compare("$noinline$deopt") == 0)) {
42      const OatQuickMethodHeader* header =
43          Runtime::Current()->GetJit()->GetCodeCache()->LookupOsrMethodHeader(m);
44      if (header != nullptr && header == GetCurrentOatQuickMethodHeader()) {
45        in_osr_method_ = true;
46      }
47      return false;
48    }
49    return true;
50  }
51
52  bool in_osr_method_;
53};
54
55extern "C" JNIEXPORT jboolean JNICALL Java_Main_ensureInOsrCode(JNIEnv*, jclass) {
56  jit::Jit* jit = Runtime::Current()->GetJit();
57  if (jit == nullptr) {
58    // Just return true for non-jit configurations to stop the infinite loop.
59    return JNI_TRUE;
60  }
61  ScopedObjectAccess soa(Thread::Current());
62  OsrVisitor visitor(soa.Self());
63  visitor.WalkStack();
64  return visitor.in_osr_method_;
65}
66
67}  // namespace art
68