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/* clock.h -- Fast clocks and timers
*
* Copyright (c) 2001-2020 Ravenbrook Limited. See end of file for license.
* $Id$
*
* .design: <design/clock>.
*/
#ifndef clock_h
#define clock_h
#include "mpmtypes.h" /* for Word */
/* EVENT_CLOCK -- fast event timestamp clock
*
* On platforms that support it, we want to stamp events with a very cheap
* and fast high-resolution timer.
*/
/* Microsoft C provides an intrinsic for the Intel rdtsc instruction.
* <https://docs.microsoft.com/en-us/cpp/intrinsics/rdtsc>
*/
#if (defined(MPS_ARCH_I3) || defined(MPS_ARCH_I6)) && defined(MPS_BUILD_MV)
typedef unsigned __int64 EventClock;
typedef union EventClockUnion {
struct {
unsigned low, high;
} half;
unsigned __int64 whole;
} EventClockUnion;
#define EVENT_CLOCK_MAKE(lvalue, low, high) \
BEGIN \
((EventClockUnion*)&(lvalue))->half.low = (low); \
((EventClockUnion*)&(lvalue))->half.high = (high); \
END
#if _MSC_VER >= 1400
#pragma intrinsic(__rdtsc)
#define EVENT_CLOCK(lvalue) \
BEGIN \
(lvalue) = __rdtsc(); \
END
#else /* _MSC_VER < 1400 */
/* This is mostly a patch for Open Dylan's bootstrap on Windows, which is
using Microsoft Visual Studio 6 because of support for CodeView debugging
information. */
#include "mpswin.h" /* KILL IT WITH FIRE! */
#define EVENT_CLOCK(lvalue) \
BEGIN \
LARGE_INTEGER _count; \
QueryPerformanceCounter(&_count); \
(lvalue) = _count.QuadPart; \
END
#endif /* _MSC_VER < 1400 */
#if defined(MPS_ARCH_I3)
/* We can't use a shift to get the top half of the 64-bit event clock,
because that introduces a dependency on `__aullshr` in the C run-time. */
#define EVENT_CLOCK_PRINT(stream, clock) \
fprintf(stream, "%08lX%08lX", \
(*(EventClockUnion *)&(clock)).half.high, \
(*(EventClockUnion *)&(clock)).half.low)
#define EVENT_CLOCK_WRITE(stream, depth, clock) \
WriteF(stream, depth, "$W$W", \
(*(EventClockUnion *)&(clock)).half.high, \
(*(EventClockUnion *)&(clock)).half.low, \
NULL)
#elif defined(MPS_ARCH_I6)
#if defined(MPS_BUILD_MV)
#define EVENT_CLOCK_PRINT(stream, clock) \
fprintf(stream, "%016llX", (clock));
#else
#define EVENT_CLOCK_PRINT(stream, clock) \
fprintf(stream, "%016lX", (clock));
#endif
#define EVENT_CLOCK_WRITE(stream, depth, clock) \
WriteF(stream, depth, "$W", (WriteFW)(clock), NULL)
#endif
#endif /* Microsoft C on Intel */
/* If we have GCC or Clang, assemble the rdtsc instruction */
#if !defined(EVENT_CLOCK) && \
(defined(MPS_ARCH_I3) || defined(MPS_ARCH_I6)) && \
(defined(MPS_BUILD_GC) || defined(MPS_BUILD_LL))
/* Use __extension__ to enable use of a 64-bit type on 32-bit pedantic
GCC or Clang. */
__extension__ typedef unsigned long long EventClock;
#define EVENT_CLOCK_MAKE(lvalue, low, high) \
((lvalue) = ((EventClock)(high) << 32) + ((EventClock)(low) & (0xfffffffful)))
/* Clang provides a cross-platform builtin for a fast timer, but it
* was not available on Mac OS X 10.8 until the release of XCode 4.6.
* <https://clang.llvm.org/docs/LanguageExtensions.html#builtins>
*/
#if defined(MPS_BUILD_LL)
#if __has_builtin(__builtin_readcyclecounter)
#define EVENT_CLOCK(lvalue) \
BEGIN \
(lvalue) = __builtin_readcyclecounter(); \
END
#endif /* __has_builtin(__builtin_readcyclecounter) */
#endif /* Clang */
#ifndef EVENT_CLOCK
#define EVENT_CLOCK(lvalue) \
BEGIN \
unsigned _l, _h; \
__asm__ __volatile__("rdtsc" : "=a"(_l), "=d"(_h)); \
(lvalue) = ((EventClock)_h << 32) | _l; \
END
#endif
/* The __extension__ keyword doesn't work on printf formats, so we
concatenate two 32-bit hex numbers to print the 64-bit value. */
#define EVENT_CLOCK_PRINT(stream, clock) \
fprintf(stream, "%08lX%08lX", \
(unsigned long)((clock) >> 32), \
(unsigned long)((clock) & 0xffffffff))
#define EVENT_CLOCK_WRITE(stream, depth, clock) \
WriteF(stream, depth, "$W$W", (WriteFW)((clock) >> 32), (WriteFW)clock, NULL)
#endif /* Intel, GCC or Clang */
/* no fast clock, use plinth, probably from the C library */
#ifndef EVENT_CLOCK
typedef mps_clock_t EventClock;
#define EVENT_CLOCK_MAKE(lvalue, low, high) \
((lvalue) = ((EventClock)(high) << 32) + ((EventClock)(low) & (0xfffffffful)))
#define EVENT_CLOCK(lvalue) \
BEGIN \
(lvalue) = mps_clock(); \
END
#define EVENT_CLOCK_PRINT(stream, clock) \
fprintf(stream, "%lu", (unsigned long)clock)
#define EVENT_CLOCK_WRITE(stream, depth, clock) \
WriteF(stream, depth, "$W", (WriteFW)clock, NULL)
#endif
#endif /* clock_h */
/* C. COPYRIGHT AND LICENSE
*
* Copyright (C) 2001-2020 Ravenbrook Limited <https://www.ravenbrook.com/>.
*
* 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 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
* HOLDER 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.
*/
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