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https://github.com/moses-smt/mosesdecoder.git
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115 lines
3.1 KiB
C++
115 lines
3.1 KiB
C++
#ifndef UTIL_MMAP__
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#define UTIL_MMAP__
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// Utilities for mmaped files.
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#include <cstddef>
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#include <stdint.h>
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#include <sys/types.h>
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namespace util {
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class scoped_fd;
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long SizePage();
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// (void*)-1 is MAP_FAILED; this is done to avoid including the mmap header here.
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class scoped_mmap {
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public:
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scoped_mmap() : data_((void*)-1), size_(0) {}
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scoped_mmap(void *data, std::size_t size) : data_(data), size_(size) {}
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~scoped_mmap();
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void *get() const { return data_; }
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const uint8_t *begin() const { return reinterpret_cast<uint8_t*>(data_); }
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const uint8_t *end() const { return reinterpret_cast<uint8_t*>(data_) + size_; }
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std::size_t size() const { return size_; }
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void reset(void *data, std::size_t size) {
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scoped_mmap other(data_, size_);
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data_ = data;
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size_ = size;
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}
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void reset() {
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reset((void*)-1, 0);
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}
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private:
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void *data_;
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std::size_t size_;
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scoped_mmap(const scoped_mmap &);
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scoped_mmap &operator=(const scoped_mmap &);
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};
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/* For when the memory might come from mmap, new char[], or malloc. Uses NULL
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* and 0 for blanks even though mmap signals errors with (void*)-1). The reset
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* function checks that blank for mmap.
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*/
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class scoped_memory {
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public:
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typedef enum {MMAP_ALLOCATED, ARRAY_ALLOCATED, MALLOC_ALLOCATED, NONE_ALLOCATED} Alloc;
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scoped_memory() : data_(NULL), size_(0), source_(NONE_ALLOCATED) {}
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~scoped_memory() { reset(); }
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void *get() const { return data_; }
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const char *begin() const { return reinterpret_cast<char*>(data_); }
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const char *end() const { return reinterpret_cast<char*>(data_) + size_; }
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std::size_t size() const { return size_; }
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Alloc source() const { return source_; }
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void reset() { reset(NULL, 0, NONE_ALLOCATED); }
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void reset(void *data, std::size_t size, Alloc from);
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// realloc allows the current data to escape hence the need for this call
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// If realloc fails, destroys the original too and get() returns NULL.
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void call_realloc(std::size_t to);
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private:
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void *data_;
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std::size_t size_;
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Alloc source_;
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scoped_memory(const scoped_memory &);
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scoped_memory &operator=(const scoped_memory &);
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};
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typedef enum {
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// mmap with no prepopulate
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LAZY,
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// On linux, pass MAP_POPULATE to mmap.
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POPULATE_OR_LAZY,
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// Populate on Linux. malloc and read on non-Linux.
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POPULATE_OR_READ,
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// malloc and read.
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READ
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} LoadMethod;
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extern const int kFileFlags;
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// Wrapper around mmap to check it worked and hide some platform macros.
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void *MapOrThrow(std::size_t size, bool for_write, int flags, bool prefault, int fd, uint64_t offset = 0);
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void MapRead(LoadMethod method, int fd, uint64_t offset, std::size_t size, scoped_memory &out);
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void MapAnonymous(std::size_t size, scoped_memory &to);
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// Open file name with mmap of size bytes, all of which are initially zero.
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void *MapZeroedWrite(int fd, std::size_t size);
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void *MapZeroedWrite(const char *name, std::size_t size, scoped_fd &file);
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// msync wrapper
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void SyncOrThrow(void *start, size_t length);
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} // namespace util
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#endif // UTIL_MMAP__
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