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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.
*/
#ifndef ART_SRC_MEM_MAP_H_
#define ART_SRC_MEM_MAP_H_
#include <stddef.h>
#include <sys/types.h>
#include "globals.h"
namespace art {
// Used to keep track of mmap segments.
class MemMap {
public:
// Request an anonymous region of a specified length.
//
// On success, returns returns a MemMap instance. On failure, returns a NULL;
static MemMap* Map(size_t length, int prot) {
return Map(NULL, length, prot);
}
// Request an anonymous region of a specified length and a requested base address.
//
// On success, returns returns a MemMap instance. On failure, returns a NULL;
static MemMap* Map(byte* addr, size_t length, int prot);
// Map part of a file, taking care of non-page aligned offsets. The
// "start" offset is absolute, not relative.
//
// On success, returns returns a MemMap instance. On failure, returns a NULL;
static MemMap* Map(size_t length, int prot, int flags, int fd, off_t start) {
return Map(NULL, length, prot, flags, fd, start);
}
// Map part of a file, taking care of non-page aligned offsets. The
// "start" offset is absolute, not relative. This version allows
// requesting a specific address for the base of the mapping.
//
// On success, returns returns a MemMap instance. On failure, returns a NULL;
static MemMap* Map(byte* addr, size_t length, int prot, int flags, int fd, off_t start);
// Releases the memory mapping
~MemMap();
byte* GetAddress() const {
return addr_;
}
size_t GetLength() const {
return length_;
}
byte* GetLimit() const {
return addr_ + length_;
}
private:
MemMap(byte* addr, size_t length, void* base_addr, size_t base_length);
byte* addr_; // start of data
size_t length_; // length of data
void* base_addr_; // page-aligned base address
size_t base_length_; // length of mapping
};
} // namespace art
#endif // ART_SRC_MEM_MAP_H_
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