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// Copyright (c) 2011, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#ifndef RUNTIME_VM_OS_H_
#define RUNTIME_VM_OS_H_
#include "vm/globals.h"
// Forward declarations.
struct tm;
namespace dart {
// Forward declarations.
class Isolate;
class Zone;
// Interface to the underlying OS platform.
class OS {
public:
// Returns the name of the given OS. For example "linux".
static const char* Name();
// Returns the current process id.
static intptr_t ProcessId();
// Returns a time-zone name for the given instant.
// The name is provided by the underlying platform.
// The returned string may be Zone allocated.
static const char* GetTimeZoneName(int64_t seconds_since_epoch);
// Returns the difference in seconds between local time and UTC for the given
// instant.
// For example 3600 for CET, and 7200 for CEST.
static int GetTimeZoneOffsetInSeconds(int64_t seconds_since_epoch);
// Returns the difference in seconds between local time and UTC when no
// daylight saving is active.
// For example 3600 in CET and CEST.
static int GetLocalTimeZoneAdjustmentInSeconds();
// Returns the current time in milliseconds measured
// from midnight January 1, 1970 UTC.
static int64_t GetCurrentTimeMillis();
// Returns the current time in microseconds measured
// from midnight January 1, 1970 UTC.
static int64_t GetCurrentTimeMicros();
// Returns the current time used by the tracing infrastructure.
static int64_t GetCurrentMonotonicMicros();
// Returns the raw clock value from the monotonic clock.
static int64_t GetCurrentMonotonicTicks();
// Returns the frequency of the monotonic clock.
static int64_t GetCurrentMonotonicFrequency();
// Returns the value of current thread's CPU usage clock in microseconds.
// NOTE: This clock will return different values depending on the calling
// thread. It is only expected to increase in value as the thread uses
// CPU time.
// NOTE: This function will return -1 on OSs that are not supported.
static int64_t GetCurrentThreadCPUMicros();
// Returns the activation frame alignment constraint or one if
// the platform doesn't care. Guaranteed to be a power of two.
static intptr_t ActivationFrameAlignment();
// This constant is guaranteed to be greater or equal to the
// preferred code alignment on all platforms.
static const int kMaxPreferredCodeAlignment = 32;
// Returns the preferred code alignment or zero if
// the platform doesn't care. Guaranteed to be a power of two.
static intptr_t PreferredCodeAlignment();
// Returns number of available processor cores.
static int NumberOfAvailableProcessors();
// Sleep the currently executing thread for millis ms.
static void Sleep(int64_t millis);
// Sleep the currently executing thread for micros microseconds.
static void SleepMicros(int64_t micros);
// Debug break.
static void DebugBreak();
// Returns the current program counter.
static uintptr_t GetProgramCounter();
// Print formatted output to stdout/stderr for debugging.
// Tracing and debugging prints from the VM should strongly prefer to use
// PrintErr to avoid interfering with the application's output, which may
// be parsed by another program.
static void Print(const char* format, ...) PRINTF_ATTRIBUTE(1, 2);
static void PrintErr(const char* format, ...) PRINTF_ATTRIBUTE(1, 2);
static void VFPrint(FILE* stream, const char* format, va_list args);
// Allocate a string and print formatted output into the buffer.
// Uses the zone for allocation if one if provided, and otherwise uses
// malloc.
static char* SCreate(Zone* zone, const char* format, ...)
PRINTF_ATTRIBUTE(2, 3);
static char* VSCreate(Zone* zone, const char* format, va_list args);
// Converts a C string which represents a valid dart integer into a 64 bit
// value.
// Returns false if it is unable to convert the string to a 64 bit value,
// the failure could be because of underflow/overflow or invalid characters.
// On success the function returns true and 'value' contains the converted
// value.
static bool StringToInt64(const char* str, int64_t* value);
// Register code observers relevant to this OS.
static void RegisterCodeObservers();
// Initialize the OS class.
static void Init();
// Cleanup the OS class.
static void Cleanup();
static DART_NORETURN void Abort();
static DART_NORETURN void Exit(int code);
};
} // namespace dart
#endif // RUNTIME_VM_OS_H_