runtime/openjdkjvmti/art_jvmti.h

/* Copyright (C) 2016 The Android Open Source Project
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This file implements interfaces from the file jvmti.h. This implementation
 * is licensed under the same terms as the file jvmti.h.  The
 * copyright and license information for the file jvmti.h follows.
 *
 * Copyright (c) 2003, 2011, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
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 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
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#ifndef ART_RUNTIME_OPENJDKJVMTI_ART_JVMTI_H_
#define ART_RUNTIME_OPENJDKJVMTI_ART_JVMTI_H_

#include <memory>

#include <jni.h>

#include "base/casts.h"
#include "base/logging.h"
#include "base/macros.h"
#include "events.h"
#include "java_vm_ext.h"
#include "jni_env_ext.h"
#include "jvmti.h"

namespace openjdkjvmti {

extern const jvmtiInterface_1 gJvmtiInterface;

// A structure that is a jvmtiEnv with additional information for the runtime.
struct ArtJvmTiEnv : public jvmtiEnv {
  art::JavaVMExt* art_vm;
  void* local_data;

  EventMasks event_masks;
  std::unique_ptr<jvmtiEventCallbacks> event_callbacks;

  explicit ArtJvmTiEnv(art::JavaVMExt* runtime) : art_vm(runtime), local_data(nullptr) {
    functions = &gJvmtiInterface;
  }

  static ArtJvmTiEnv* AsArtJvmTiEnv(jvmtiEnv* env) {
    return art::down_cast<ArtJvmTiEnv*>(env);
  }
};

// Macro and constexpr to make error values less annoying to write.
#define ERR(e) JVMTI_ERROR_ ## e
static constexpr jvmtiError OK = JVMTI_ERROR_NONE;

// Special error code for unimplemented functions in JVMTI
static constexpr jvmtiError ERR(NOT_IMPLEMENTED) = JVMTI_ERROR_NOT_AVAILABLE;

static inline JNIEnv* GetJniEnv(jvmtiEnv* env) {
  JNIEnv* ret_value = nullptr;
  jint res = reinterpret_cast<ArtJvmTiEnv*>(env)->art_vm->GetEnv(
      reinterpret_cast<void**>(&ret_value), JNI_VERSION_1_1);
  if (res != JNI_OK) {
    return nullptr;
  }
  return ret_value;
}

class JvmtiDeleter {
 public:
  JvmtiDeleter() : env_(nullptr) {}
  explicit JvmtiDeleter(jvmtiEnv* env) : env_(env) {}

  JvmtiDeleter(JvmtiDeleter&) = default;
  JvmtiDeleter(JvmtiDeleter&&) = default;
  JvmtiDeleter& operator=(const JvmtiDeleter&) = default;

  void operator()(unsigned char* ptr) const {
    CHECK(env_ != nullptr);
    jvmtiError ret = env_->Deallocate(ptr);
    CHECK(ret == ERR(NONE));
  }

 private:
  mutable jvmtiEnv* env_;
};

using JvmtiUniquePtr = std::unique_ptr<unsigned char, JvmtiDeleter>;

ALWAYS_INLINE
static inline JvmtiUniquePtr MakeJvmtiUniquePtr(jvmtiEnv* env, unsigned char* mem) {
  return JvmtiUniquePtr(mem, JvmtiDeleter(env));
}

}  // namespace openjdkjvmti

#endif  // ART_RUNTIME_OPENJDKJVMTI_ART_JVMTI_H_