b320dfcf58
These classes are meant to replace OS::Ticks() and OS::TimeCurrentMillis(), which are broken in several ways. The ElapsedTimer class implements a stopwatch using TimeTicks::HighResNow() for high resolution, monotonic timing. Also fix the CpuProfile::GetStartTime() and CpuProfile::GetEndTime() methods to actually return the time relative to the unix epoch as stated in the documentation (previously that was relative to some arbitrary point in time, i.e. boot time). The previous Windows issues have been resolved, and we now use GetTickCount64() on Windows Vista and later, falling back to timeGetTime() with rollover protection for earlier Windows versions. BUG=v8:2853 R=machenbach@chromium.org, yurys@chromium.org Review URL: https://codereview.chromium.org/23490015 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16413 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
106 lines
3.6 KiB
C++
106 lines
3.6 KiB
C++
// Copyright 2011 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Extra POSIX/ANSI routines for Win32 when using Visual Studio C++. Please
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// refer to The Open Group Base Specification for specification of the correct
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// semantics for these functions.
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// (http://www.opengroup.org/onlinepubs/000095399/)
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#ifdef _MSC_VER
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#include "win32-headers.h"
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#include <limits.h> // Required for INT_MAX etc.
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#include <float.h> // Required for DBL_MAX and on Win32 for finite()
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#include <cmath>
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#include "win32-math.h"
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#include "checks.h"
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namespace std {
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// Test for a NaN (not a number) value - usually defined in math.h
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int isnan(double x) {
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return _isnan(x);
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}
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// Test for infinity - usually defined in math.h
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int isinf(double x) {
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return (_fpclass(x) & (_FPCLASS_PINF | _FPCLASS_NINF)) != 0;
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}
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// Test for finite value - usually defined in math.h
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int isfinite(double x) {
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return _finite(x);
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}
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// Test if x is less than y and both nominal - usually defined in math.h
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int isless(double x, double y) {
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return isnan(x) || isnan(y) ? 0 : x < y;
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}
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// Test if x is greater than y and both nominal - usually defined in math.h
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int isgreater(double x, double y) {
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return isnan(x) || isnan(y) ? 0 : x > y;
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}
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// Classify floating point number - usually defined in math.h
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int fpclassify(double x) {
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// Use the MS-specific _fpclass() for classification.
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int flags = _fpclass(x);
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// Determine class. We cannot use a switch statement because
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// the _FPCLASS_ constants are defined as flags.
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if (flags & (_FPCLASS_PN | _FPCLASS_NN)) return FP_NORMAL;
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if (flags & (_FPCLASS_PZ | _FPCLASS_NZ)) return FP_ZERO;
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if (flags & (_FPCLASS_PD | _FPCLASS_ND)) return FP_SUBNORMAL;
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if (flags & (_FPCLASS_PINF | _FPCLASS_NINF)) return FP_INFINITE;
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// All cases should be covered by the code above.
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ASSERT(flags & (_FPCLASS_SNAN | _FPCLASS_QNAN));
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return FP_NAN;
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}
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// Test sign - usually defined in math.h
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int signbit(double x) {
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// We need to take care of the special case of both positive
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// and negative versions of zero.
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if (x == 0)
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return _fpclass(x) & _FPCLASS_NZ;
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else
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return x < 0;
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}
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} // namespace std
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#endif // _MSC_VER
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