cshapiro@google.com
da14bf70a7
This change also corrects some misuses of format strings and format arguments that discovered by the compiler checks. Review URL: https://chromiumcodereview.appspot.com//10869063 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@11912 260f80e4-7a28-3924-810f-c04153c831b5
112 lines
3.8 KiB
C++
112 lines
3.8 KiB
C++
// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef VM_OS_H_
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#define VM_OS_H_
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#include "vm/globals.h"
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// Forward declarations.
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class tm;
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namespace dart {
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// Forward declarations.
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class Isolate;
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// Interface to the underlying OS platform.
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class OS {
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public:
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// Returns the abbreviated time-zone name for the given instant.
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// For example "CET" or "CEST".
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static const char* GetTimeZoneName(int64_t seconds_since_epoch);
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// Returns the difference in seconds between local time and UTC for the given
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// instant.
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// For example 3600 for CET, and 7200 for CEST.
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static int GetTimeZoneOffsetInSeconds(int64_t seconds_since_epoch);
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// Returns the difference in seconds between local time and UTC when no
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// daylight saving is active.
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// For example 3600 in CET and CEST.
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static int GetLocalTimeZoneAdjustmentInSeconds();
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// Returns the current time in milliseconds measured
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// from midnight January 1, 1970 UTC.
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static int64_t GetCurrentTimeMillis();
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// Returns the current time in microseconds measured
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// from midnight January 1, 1970 UTC.
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static int64_t GetCurrentTimeMicros();
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// Returns the activation frame alignment constraint or zero if
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// the platform doesn't care. Guaranteed to be a power of two.
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static word ActivationFrameAlignment();
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// This constant is guaranteed to be greater or equal to the
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// preferred code alignment on all platforms.
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static const int kMaxPreferredCodeAlignment = 32;
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// Returns the preferred code alignment or zero if
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// the platform doesn't care. Guaranteed to be a power of two.
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static word PreferredCodeAlignment();
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// Returns the stack size limit.
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static uword GetStackSizeLimit();
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// Returns number of available processor cores.
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static int NumberOfAvailableProcessors();
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// Sleep the currently executing thread for millis ms.
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static void Sleep(int64_t millis);
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// Print formatted output to stdout/stderr for debugging.
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static void Print(const char* format, ...) PRINTF_ATTRIBUTE(1, 2);
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static void PrintErr(const char* format, ...) PRINTF_ATTRIBUTE(1, 2);
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static void VFPrint(FILE* stream, const char* format, va_list args);
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// Print formatted output info a buffer.
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//
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// Does not write more than size characters (including the trailing '\0').
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//
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// Returns the number of characters (excluding the trailing '\0')
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// that would been written if the buffer had been big enough. If
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// the return value is greater or equal than the given size then the
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// output has been truncated. The return value is never negative.
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//
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// The buffer will always be terminated by a '\0', unless the buffer
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// is of size 0. The buffer might be NULL if the size is 0.
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//
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// This specification conforms to C99 standard which is implemented
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// by glibc 2.1+ with one exception: the C99 standard allows a
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// negative return value. We will terminate the vm rather than let
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// that occur.
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static int SNPrint(char* str, size_t size, const char* format, ...)
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PRINTF_ATTRIBUTE(3, 4);
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static int VSNPrint(char* str, size_t size,
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const char* format,
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va_list args);
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// Converts a C string which represents a valid dart integer into a 64 bit
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// value.
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// Returns false if it is unable to convert the string to a 64 bit value,
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// the failure could be because of underflow/overflow or invalid characters.
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// On success the function returns true and 'value' contains the converted
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// value.
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static bool StringToInt64(const char* str, int64_t* value);
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// Initialize the OS class.
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static void InitOnce();
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// Shut down the OS class.
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static void Shutdown();
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static void Abort();
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static void Exit(int code);
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};
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} // namespace dart
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#endif // VM_OS_H_
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