diff options
Diffstat (limited to 'compiler/cbits')
-rw-r--r-- | compiler/cbits/genSym.c | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/compiler/cbits/genSym.c b/compiler/cbits/genSym.c index 70ea417c4b..725a310253 100644 --- a/compiler/cbits/genSym.c +++ b/compiler/cbits/genSym.c @@ -1,18 +1,35 @@ - +#include <assert.h> #include "Rts.h" +#include "Unique.h" static HsInt GenSymCounter = 0; static HsInt GenSymInc = 1; +#define UNIQUE_MASK ((1ULL << UNIQUE_BITS) - 1) + +STATIC_INLINE void checkUniqueRange(HsInt u STG_UNUSED) { +#if DEBUG + // Uh oh! We will overflow next time a unique is requested. + assert(h != UNIQUE_MASK); +#endif +} + HsInt genSym(void) { #if defined(THREADED_RTS) if (n_capabilities == 1) { - return GenSymCounter = (GenSymCounter + GenSymInc) & 0xFFFFFF; + GenSymCounter = (GenSymCounter + GenSymInc) & UNIQUE_MASK; + checkUniqueRange(GenSymCounter); + return GenSymCounter; } else { - return atomic_inc((StgWord *)&GenSymCounter, GenSymInc) & 0xFFFFFF; + HsInt n = atomic_inc((StgWord *)&GenSymCounter, GenSymInc) + & UNIQUE_MASK; + checkUniqueRange(n); + return n; } #else - return GenSymCounter = (GenSymCounter + GenSymInc) & 0xFFFFFF; + GenSymCounter = (GenSymCounter + GenSymInc) & UNIQUE_MASK; + checkUniqueRange(GenSymCounter); + return GenSymCounter; #endif } |