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/*
* test_util.c - utility functions for test programs
*
* Copyright 2016 Eric Biggers
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef _WIN32
/* for MAP_ANONYMOUS or MAP_ANON, which unfortunately aren't part of POSIX... */
# undef _POSIX_C_SOURCE
# ifdef __APPLE__
# define _DARWIN_C_SOURCE
# elif defined(__linux__)
# define _GNU_SOURCE
# endif
#endif
#include "test_util.h"
#include <fcntl.h>
#include <time.h>
#ifdef _WIN32
# include <windows.h>
#else
# include <unistd.h>
# include <sys/mman.h>
# include <sys/time.h>
#endif
#ifndef MAP_ANONYMOUS
# define MAP_ANONYMOUS MAP_ANON
#endif
/* Abort with an error message */
_noreturn void
assertion_failed(const char *expr, const char *file, int line)
{
msg("Assertion failed: %s at %s:%d", expr, file, line);
abort();
}
void
begin_performance_test(void)
{
/* Skip performance tests by default, since they can be flaky. */
if (getenv("INCLUDE_PERF_TESTS") == NULL)
exit(0);
}
static size_t
get_page_size(void)
{
#ifdef _WIN32
SYSTEM_INFO info;
GetSystemInfo(&info);
return info.dwPageSize;
#else
return sysconf(_SC_PAGESIZE);
#endif
}
/* Allocate a buffer with guard pages */
void
alloc_guarded_buffer(size_t size, u8 **start_ret, u8 **end_ret)
{
const size_t pagesize = get_page_size();
const size_t nr_pages = (size + pagesize - 1) / pagesize;
u8 *base_addr;
u8 *start, *end;
#ifdef _WIN32
DWORD oldProtect;
#endif
*start_ret = NULL;
*end_ret = NULL;
#ifdef _WIN32
/* Allocate buffer and guard pages with no access. */
base_addr = VirtualAlloc(NULL, (nr_pages + 2) * pagesize,
MEM_COMMIT | MEM_RESERVE, PAGE_NOACCESS);
if (!base_addr) {
msg("Unable to allocate memory (VirtualAlloc): Windows error %u",
(unsigned int)GetLastError());
ASSERT(0);
}
start = base_addr + pagesize;
end = start + (nr_pages * pagesize);
/* Grant read+write access to just the buffer. */
if (!VirtualProtect(start, end - start, PAGE_READWRITE, &oldProtect)) {
msg("Unable to protect memory (VirtualProtect): Windows error %u",
(unsigned int)GetLastError());
VirtualFree(base_addr, 0, MEM_RELEASE);
ASSERT(0);
}
#else
/* Allocate buffer and guard pages. */
base_addr = mmap(NULL, (nr_pages + 2) * pagesize, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_ANONYMOUS, -1, 0);
if (base_addr == (u8 *)MAP_FAILED) {
msg_errno("Unable to allocate memory (anonymous mmap)");
ASSERT(0);
}
start = base_addr + pagesize;
end = start + (nr_pages * pagesize);
/* Unmap the guard pages. */
munmap(base_addr, pagesize);
munmap(end, pagesize);
#endif
*start_ret = start;
*end_ret = end;
}
/* Free a buffer that was allocated by alloc_guarded_buffer() */
void
free_guarded_buffer(u8 *start, u8 *end)
{
if (!start)
return;
#ifdef _WIN32
VirtualFree(start - get_page_size(), 0, MEM_RELEASE);
#else
munmap(start, end - start);
#endif
}
/*
* Return the number of timer ticks that have elapsed since some unspecified
* point fixed at the start of program execution
*/
u64
timer_ticks(void)
{
#ifdef _WIN32
LARGE_INTEGER count;
QueryPerformanceCounter(&count);
return count.QuadPart;
#elif defined(HAVE_CLOCK_GETTIME)
struct timespec ts;
clock_gettime(CLOCK_MONOTONIC, &ts);
return (1000000000 * (u64)ts.tv_sec) + ts.tv_nsec;
#else
struct timeval tv;
gettimeofday(&tv, NULL);
return (1000000 * (u64)tv.tv_sec) + tv.tv_usec;
#endif
}
/*
* Return the number of timer ticks per second
*/
static u64
timer_frequency(void)
{
#ifdef _WIN32
LARGE_INTEGER freq;
QueryPerformanceFrequency(&freq);
return freq.QuadPart;
#elif defined(HAVE_CLOCK_GETTIME)
return 1000000000;
#else
return 1000000;
#endif
}
/*
* Convert a number of elapsed timer ticks to milliseconds
*/
u64 timer_ticks_to_ms(u64 ticks)
{
return ticks * 1000 / timer_frequency();
}
/*
* Convert a byte count and a number of elapsed timer ticks to MB/s
*/
u64 timer_MB_per_s(u64 bytes, u64 ticks)
{
return bytes * timer_frequency() / ticks / 1000000;
}
/*
* Convert a byte count and a number of elapsed timer ticks to KB/s
*/
u64 timer_KB_per_s(u64 bytes, u64 ticks)
{
return bytes * timer_frequency() / ticks / 1000;
}
bool
put_bits(struct output_bitstream *os, machine_word_t bits, int num_bits)
{
os->bitbuf |= bits << os->bitcount;
os->bitcount += num_bits;
while (os->bitcount >= 8) {
if (os->next == os->end)
return false;
*os->next++ = os->bitbuf;
os->bitcount -= 8;
os->bitbuf >>= 8;
}
return true;
}
bool
flush_bits(struct output_bitstream *os)
{
while (os->bitcount > 0) {
if (os->next == os->end)
return false;
*os->next++ = os->bitbuf;
os->bitcount -= 8;
os->bitbuf >>= 8;
}
os->bitcount = 0;
return true;
}
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