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/* 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.
*
* 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
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
#ifndef ART_OPENJDKJVMTI_JVMTI_ALLOCATOR_H_
#define ART_OPENJDKJVMTI_JVMTI_ALLOCATOR_H_
#include <android-base/logging.h>
#include <android-base/macros.h>
#include "jvmti.h"
#include "ti_allocator.h"
namespace openjdkjvmti {
template <typename T> class JvmtiAllocator;
template <>
class JvmtiAllocator<void> {
public:
using value_type = void;
using pointer = void*;
using const_pointer = const void*;
template <typename U>
struct rebind {
using other = JvmtiAllocator<U>;
};
explicit JvmtiAllocator(jvmtiEnv* env) : env_(env) {}
JvmtiAllocator() : env_(nullptr) {}
template <typename U>
JvmtiAllocator(const JvmtiAllocator<U>& other)
: env_(other.env_) {}
JvmtiAllocator(const JvmtiAllocator& other) = default;
JvmtiAllocator& operator=(const JvmtiAllocator& other) = default;
~JvmtiAllocator() = default;
private:
jvmtiEnv* env_;
template <typename U>
friend class JvmtiAllocator;
template <typename U>
friend bool operator==(const JvmtiAllocator<U>& lhs, const JvmtiAllocator<U>& rhs);
};
template <typename T>
class JvmtiAllocator {
public:
using value_type = T;
using pointer = T*;
using reference = T&;
using const_pointer = const T*;
using const_reference = const T&;
using size_type = size_t;
using difference_type = ptrdiff_t;
template <typename U>
struct rebind {
using other = JvmtiAllocator<U>;
};
explicit JvmtiAllocator(jvmtiEnv* env) : env_(env) {}
JvmtiAllocator() : env_(nullptr) {}
template <typename U>
JvmtiAllocator(const JvmtiAllocator<U>& other)
: env_(other.env_) {}
JvmtiAllocator(const JvmtiAllocator& other) = default;
JvmtiAllocator& operator=(const JvmtiAllocator& other) = default;
~JvmtiAllocator() = default;
size_type max_size() const {
return static_cast<size_type>(-1) / sizeof(T);
}
pointer address(reference x) const { return &x; }
const_pointer address(const_reference x) const { return &x; }
pointer allocate(size_type n, JvmtiAllocator<void>::pointer hint ATTRIBUTE_UNUSED = nullptr) {
DCHECK_LE(n, max_size());
if (env_ == nullptr) {
T* result = reinterpret_cast<T*>(AllocUtil::AllocateImpl(n * sizeof(T)));
CHECK(result != nullptr || n == 0u); // Abort if AllocateImpl() fails.
return result;
} else {
unsigned char* result;
jvmtiError alloc_error = env_->Allocate(n * sizeof(T), &result);
CHECK(alloc_error == JVMTI_ERROR_NONE);
return reinterpret_cast<T*>(result);
}
}
void deallocate(pointer p, size_type n ATTRIBUTE_UNUSED) {
if (env_ == nullptr) {
AllocUtil::DeallocateImpl(reinterpret_cast<unsigned char*>(p));
} else {
jvmtiError dealloc_error = env_->Deallocate(reinterpret_cast<unsigned char*>(p));
CHECK(dealloc_error == JVMTI_ERROR_NONE);
}
}
void construct(pointer p, const_reference val) {
new (static_cast<void*>(p)) value_type(val);
}
template <class U, class... Args>
void construct(U* p, Args&&... args) {
::new (static_cast<void*>(p)) U(std::forward<Args>(args)...);
}
void destroy(pointer p) {
p->~value_type();
}
inline bool operator==(JvmtiAllocator const& other) {
return env_ == other.env_;
}
inline bool operator!=(JvmtiAllocator const& other) {
return !operator==(other);
}
private:
jvmtiEnv* env_;
template <typename U>
friend class JvmtiAllocator;
template <typename U>
friend bool operator==(const JvmtiAllocator<U>& lhs, const JvmtiAllocator<U>& rhs);
};
template <typename T>
inline bool operator==(const JvmtiAllocator<T>& lhs, const JvmtiAllocator<T>& rhs) {
return lhs.env_ == rhs.env_;
}
template <typename T>
inline bool operator!=(const JvmtiAllocator<T>& lhs, const JvmtiAllocator<T>& rhs) {
return !(lhs == rhs);
}
} // namespace openjdkjvmti
#endif // ART_OPENJDKJVMTI_JVMTI_ALLOCATOR_H_
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