Fuchsia: Build standalone VM. Make it run "Hello, World!".

runtime/bin/utils_fuchsia.cc

Index: runtime/bin/utils_fuchsia.cc
diff --git a/runtime/bin/utils_linux.cc b/runtime/bin/utils_fuchsia.cc
similarity index 61%
copy from runtime/bin/utils_linux.cc
copy to runtime/bin/utils_fuchsia.cc
index 2029071abebae223b5e3d1cb21f85d6b1d06d9f7..1df2aba4e45547cfa9228ce9da418a97114a0263 100644
--- a/runtime/bin/utils_linux.cc
+++ b/runtime/bin/utils_fuchsia.cc
@@ -1,14 +1,13 @@
-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2016, 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.
 
 #include "platform/globals.h"
-#if defined(TARGET_OS_LINUX)
+#if defined(TARGET_OS_FUCHSIA)
 
-#include <errno.h>  // NOLINT
-#include <netdb.h>  // NOLINT
-#include <sys/time.h>  // NOLINT
-#include <time.h>  // NOLINT
+#include <errno.h>
+#include <magenta/syscalls.h>
+#include <magenta/types.h>
 
 #include "bin/utils.h"
 #include "platform/assert.h"
@@ -34,7 +33,7 @@ void OSError::SetCodeAndMessage(SubSystem sub_system, int code) {
     char error_buf[kBufferSize];
     SetMessage(Utils::StrError(code, error_buf, kBufferSize));
   } else if (sub_system == kGetAddressInfo) {
-    SetMessage(gai_strerror(code));
+    UNIMPLEMENTED();
   } else {
     UNREACHABLE();
   }
@@ -84,41 +83,17 @@ int64_t TimerUtils::GetCurrentMonotonicMillis() {
 
 
 int64_t TimerUtils::GetCurrentMonotonicMicros() {
-  struct timespec ts;
-  if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0) {
-    UNREACHABLE();
-    return 0;
-  }
-  // Convert to microseconds.
-  int64_t result = ts.tv_sec;
-  result *= kMicrosecondsPerSecond;
-  result += (ts.tv_nsec / kNanosecondsPerMicrosecond);
-  return result;
+  int64_t ticks = mx_current_time();
+  return ticks / kNanosecondsPerMicrosecond;
 }
 
 
 void TimerUtils::Sleep(int64_t millis) {
-  struct timespec req;  // requested.
-  struct timespec rem;  // remainder.
-  int64_t micros = millis * kMicrosecondsPerMillisecond;
-  int64_t seconds = micros / kMicrosecondsPerSecond;
-  micros = micros - seconds * kMicrosecondsPerSecond;
-  int64_t nanos = micros * kNanosecondsPerMicrosecond;
-  req.tv_sec = seconds;
-  req.tv_nsec = nanos;
-  while (true) {
-    int r = nanosleep(&req, &rem);
-    if (r == 0) {
-      break;
-    }
-    // We should only ever see an interrupt error.
-    ASSERT(errno == EINTR);
-    // Copy remainder into requested and repeat.
-    req = rem;
-  }
+  mx_nanosleep(
+      millis * kMicrosecondsPerMillisecond * kNanosecondsPerMicrosecond);
 }
 
 }  // namespace bin
 }  // namespace dart
 
-#endif  // defined(TARGET_OS_LINUX)
+#endif  // defined(TARGET_OS_FUCHSIA)