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// Copyright (C) 2010, Gabriel Dos Reis.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// - Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// - Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in
// the documentation and/or other materials provided with the
// distribution.
//
// - Neither the name of The Numerical Algorithms Group Ltd. nor the
// names of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
// IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
// TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
// PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
// OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// --%: Gabriel Dos Reis.
#include <open-axiom/config>
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#ifdef HAVE_SYS_STAT_H
# include <sys/stat.h>
#endif
#include <sys/types.h>
#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif
#ifdef HAVE_UNISTD_H
# include <unistd.h>
#endif
#ifdef HAVE_SYS_MMAN_H
# include <sys/mman.h>
#endif
#ifdef OPENAXIOM_MS_WINDOWS_HOST
# include <windows.h>
#endif
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <new> // for placement new.
#include <open-axiom/storage>
namespace OpenAxiom {
// ----------------
// -- SystemError --
// ----------------
SystemError::SystemError(std::string s) : text(s) { }
SystemError::~SystemError() { }
const std::string&
SystemError::message() const {
return text;
}
void
filesystem_error(std::string s) {
throw SystemError(s);
}
namespace Memory {
// Return storage page allocation unit in byte count.
size_t page_size() {
#if defined(OPENAXIOM_MS_WINDOWS_HOST)
SYSTEM_INFO si = { };
GetSystemInfo(&si);
return si.dwPageSize;
#elif defined(HAVE_UNISTD_H)
return sysconf(_SC_PAGESIZE);
#else
// Well, we have to return a number.
return 4096;
#endif
}
// Subroutine of os_acquire_raw_memory. Attempt to acquire
// storage from the host OS. Return null on failure.
static inline Pointer
os_allocate_read_write_raw_memory(size_t nbytes) {
#if defined(OPENAXIOM_MS_WINDOWS_HOST)
return VirtualAlloc(Pointer(), nbytes,
MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
#elif defined(HAVE_SYS_MMAN_H)
Pointer p = mmap(Pointer(), nbytes, PROT_READ | PROT_WRITE,
MAP_PRIVATE | OPENAXIOM_MM_ANONYMOUS_MAP_FLAG,
-1, 0);
return p == MAP_FAILED ? Pointer() : p;
#else
return malloc(byte_count);
#endif
}
Pointer
os_acquire_raw_memory(size_t nbytes) {
Pointer p = os_allocate_read_write_raw_memory(nbytes);
if (p == 0)
throw SystemError("cannot acquire more memory");
return memset(p, nbytes, 0);
}
void
os_release_raw_memory(Pointer p, size_t n) {
#if defined(OPENAXIOM_MS_WINDOWS_HOST)
VirtualFree(p, 0, MEM_RELEASE);
#elif defined(HAVE_SYS_MMAN_H)
munmap(p, n);
#else
free(p);
#endif
}
// -------------
// -- Storage --
// -------------
Storage*
Storage::acquire(size_t alignment, size_t byte_count) {
// Adjust for overhead, and page boundary.
byte_count = round_up(byte_count + sizeof(Storage), page_size());
Storage* mem = new(os_acquire_raw_memory(byte_count)) Storage;
mem->limit_top = mem->base() + round_up(sizeof(Storage), alignment);
mem->limit_bot = mem->base() + byte_count;
mem->free = mem->limit_top;
return mem;
}
void
Storage::release(Storage* store) {
os_release_raw_memory(store, store->extent());
}
void*
Storage::allocate(size_t n) {
void* result = free;
free += n;
return memset(result, 0, n);
}
bool
Storage::align_to(size_t alignment) {
if (alignment == 0) // protect against nuts
return true;
if (alignment == 1) // no preferred alignment at all
return true;
Byte* b = base();
const size_t offset = round_up(free - b, alignment);
if (offset < size_t(limit_bot - b)) {
free = b + offset;
return true;
}
return false; // not enough room left
}
// -----------------
// -- FileMapping --
// -----------------
FileMapping::FileMapping(std::string path)
: start(), extent() {
#if defined(OPENAXIOM_MS_WINDOWS_HOST)
HANDLE file = CreateFile(path.c_str(), GENERIC_READ, 0, 0,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL, 0);
if (file == INVALID_HANDLE_VALUE)
filesystem_error("could not access file " + path);
HANDLE mapping = CreateFileMapping(file, 0, PAGE_READONLY, 0, 0, 0);
if (mapping == 0)
filesystem_error("could not map file " + path);
start = MapViewOfFile(mapping, FILE_MAP_READ, 0, 0, 0);
extent = GetFileSize(file, 0);
CloseHandle(mapping);
CloseHandle(file);
#elif defined(HAVE_SYS_STAT_H) && defined(HAVE_SYS_MMAN_H) && defined(HAVE_FCNTL_H)
struct stat s;
errno = 0;
if (stat(path.c_str(), &s) < 0)
filesystem_error("could not access file " + path);
else if (!S_ISREG(s.st_mode))
filesystem_error(path + " is not a regular file");
int fd = open(path.c_str(), O_RDONLY);
if (fd < 0)
filesystem_error("could not open " + path);
start = mmap(Pointer(), s.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
close(fd);
if (start == MAP_FAILED)
filesystem_error("could not map file " + path);
extent = s.st_size;
#else
# error "Don't know how to map a file on this platform"
#endif // OPENAXIOM_MS_WINDOWS_HOST
}
FileMapping::~FileMapping() {
#if defined(OPENAXIOM_MS_WINDOWS_HOST)
UnmapViewOfFile(start);
#elif defined(HAVE_SYS_MMAN_H)
munmap(start, extent);
#else
# error "Don't know how to unmap a file on this platform"
#endif
}
}
}
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