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#include <Rts.h>
#include <assert.h>
#include "Unique.h"
#include <ghcversion.h>
// These global variables have been moved into the RTS. It allows them to be
// shared with plugins even if two different instances of the GHC library are
// loaded at the same time (#19940)
//
// The CPP is thus about the RTS version GHC is linked against, and not the
// version of the GHC being built.
#if !MIN_VERSION_GLASGOW_HASKELL(9,3,0,0)
HsInt ghc_unique_counter = 0;
HsInt ghc_unique_inc = 1;
#endif
#define UNIQUE_BITS (sizeof (HsInt) * 8 - UNIQUE_TAG_BITS)
#define UNIQUE_MASK ((1ULL << UNIQUE_BITS) - 1)
HsInt genSym(void) {
HsInt u = atomic_inc((StgWord *)&ghc_unique_counter, ghc_unique_inc) & UNIQUE_MASK;
// Uh oh! We will overflow next time a unique is requested.
ASSERT(u != UNIQUE_MASK);
return u;
}
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