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[WebAssembly] Add SWIFT_ONCE_F implementation to Lazy.h #31674

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Merged
merged 1 commit into from
May 13, 2020
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[WebAssembly] Add SWIFT_ONCE_F implementation to Lazy.h #31674

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22 changes: 22 additions & 0 deletions include/swift/Basic/Lazy.h
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,24 @@
#include "swift/Basic/Malloc.h"
#include "swift/Basic/type_traits.h"

#if defined(__wasi__)
// Temporary single-threaded stub. Should be replaced with a thread-safe version
// as soon as the WASI SDK allows it. See https://bugs.swift.org/browse/SR-12766.
inline void wasi_call_once(int *flag, void *context, void (*func)(void *)) {
switch (*flag) {
case 0:
*flag = 1;
func(context);
return;
case 1:
return;
default:
assert(false && "wasi_call_once got invalid flag");
abort();
}
}
#endif

namespace swift {

#ifdef __APPLE__
Expand All @@ -38,6 +56,10 @@ namespace swift {
using OnceToken_t = unsigned long;
# define SWIFT_ONCE_F(TOKEN, FUNC, CONTEXT) \
_swift_once_f(&TOKEN, CONTEXT, FUNC)
#elif defined(__wasi__)
using OnceToken_t = int;
# define SWIFT_ONCE_F(TOKEN, FUNC, CONTEXT) \
::wasi_call_once(&TOKEN, CONTEXT, FUNC)
#else
using OnceToken_t = std::once_flag;
# define SWIFT_ONCE_F(TOKEN, FUNC, CONTEXT) \
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