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Port stdlib/public/stubs/GlobalObjects to Windows #6239

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Merged
merged 1 commit into from
Jan 9, 2017
Merged

Port stdlib/public/stubs/GlobalObjects to Windows #6239

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22 changes: 5 additions & 17 deletions stdlib/public/stubs/GlobalObjects.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@
#include "swift/Runtime/Metadata.h"
#include "swift/Runtime/Debug.h"
#include <stdlib.h>
#include <random>

namespace swift {
// FIXME(ABI)#76 : does this declaration need SWIFT_RUNTIME_STDLIB_INTERFACE?
Expand Down Expand Up @@ -106,23 +107,10 @@ swift::_SwiftEmptySetStorage swift::_swiftEmptySetStorage = {
};

static __swift_uint64_t randomUInt64() {
#if defined(__APPLE__)
return static_cast<__swift_uint64_t>(arc4random()) |
(static_cast<__swift_uint64_t>(arc4random()) << 32);
#else
auto devUrandom = fopen("/dev/urandom", "r");
if (!devUrandom) {
swift::fatalError(/* flags = */ 0, "Opening \"/dev/urandom\" failed");
}
uint64_t result;
if (fread(&result, sizeof(result), 1, devUrandom) != 1) {
swift::fatalError(/* flags = */ 0, "Reading from \"/dev/urandom\" failed");
}
if (fclose(devUrandom)) {
swift::fatalError(/* flags = */ 0, "Closing \"/dev/urandom\" failed");
}
return result;
#endif
std::random_device randomDevice;
std::mt19937_64 twisterEngine(randomDevice());
std::uniform_int_distribution<__swift_uint64_t> distribution;
return distribution(twisterEngine);
}

SWIFT_ALLOWED_RUNTIME_GLOBAL_CTOR_BEGIN
Expand Down