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/*
* Stack-less Just-In-Time compiler
*
* Copyright Zoltan Herczeg (hzmester@freemail.hu). All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) 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 HOLDER(S) 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.
*/
#define SLJIT_HAS_CHUNK_HEADER
#define SLJIT_HAS_EXECUTABLE_OFFSET
struct sljit_chunk_header {
void *executable;
};
#include <sys/stat.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#ifndef O_NOATIME
#define O_NOATIME 0
#endif
/* this is a linux extension available since kernel 3.11 */
#ifndef O_TMPFILE
#define O_TMPFILE 0x404000
#endif
#ifndef _GNU_SOURCE
char *secure_getenv(const char *name);
int mkostemp(char *template, int flags);
#endif
static SLJIT_INLINE int create_tempfile(void)
{
int fd;
char tmp_name[256];
size_t tmp_name_len = 0;
char *dir;
struct stat st;
#if defined(SLJIT_SINGLE_THREADED) && SLJIT_SINGLE_THREADED
mode_t mode;
#endif
#ifdef HAVE_MEMFD_CREATE
/* this is a GNU extension, make sure to use -D_GNU_SOURCE */
fd = memfd_create("sljit", MFD_CLOEXEC);
if (fd != -1) {
fchmod(fd, 0);
return fd;
}
#endif
dir = secure_getenv("TMPDIR");
if (dir) {
size_t len = strlen(dir);
if (len > 0 && len < sizeof(tmp_name)) {
if ((stat(dir, &st) == 0) && S_ISDIR(st.st_mode)) {
memcpy(tmp_name, dir, len + 1);
tmp_name_len = len;
}
}
}
#ifdef P_tmpdir
if (!tmp_name_len) {
tmp_name_len = strlen(P_tmpdir);
if (tmp_name_len > 0 && tmp_name_len < sizeof(tmp_name))
strcpy(tmp_name, P_tmpdir);
}
#endif
if (!tmp_name_len) {
strcpy(tmp_name, "/tmp");
tmp_name_len = 4;
}
SLJIT_ASSERT(tmp_name_len > 0 && tmp_name_len < sizeof(tmp_name));
if (tmp_name_len > 1 && tmp_name[tmp_name_len - 1] == '/')
tmp_name[--tmp_name_len] = '\0';
fd = open(tmp_name, O_TMPFILE | O_EXCL | O_RDWR | O_NOATIME | O_CLOEXEC, 0);
if (fd != -1)
return fd;
if (tmp_name_len >= sizeof(tmp_name) - 7)
return -1;
strcpy(tmp_name + tmp_name_len, "/XXXXXX");
#if defined(SLJIT_SINGLE_THREADED) && SLJIT_SINGLE_THREADED
mode = umask(0777);
#endif
fd = mkostemp(tmp_name, O_CLOEXEC | O_NOATIME);
#if defined(SLJIT_SINGLE_THREADED) && SLJIT_SINGLE_THREADED
umask(mode);
#else
fchmod(fd, 0);
#endif
if (fd == -1)
return -1;
if (unlink(tmp_name)) {
close(fd);
return -1;
}
return fd;
}
static SLJIT_INLINE struct sljit_chunk_header* alloc_chunk(sljit_uw size)
{
struct sljit_chunk_header *retval;
int fd;
fd = create_tempfile();
if (fd == -1)
return NULL;
if (ftruncate(fd, (off_t)size)) {
close(fd);
return NULL;
}
retval = (struct sljit_chunk_header *)mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (retval == MAP_FAILED) {
close(fd);
return NULL;
}
retval->executable = mmap(NULL, size, PROT_READ | PROT_EXEC, MAP_SHARED, fd, 0);
if (retval->executable == MAP_FAILED) {
munmap((void *)retval, size);
close(fd);
return NULL;
}
close(fd);
return retval;
}
static SLJIT_INLINE void free_chunk(void *chunk, sljit_uw size)
{
struct sljit_chunk_header *header = ((struct sljit_chunk_header *)chunk) - 1;
munmap(header->executable, size);
munmap((void *)header, size);
}
#include "sljitExecAllocatorCore.c"
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