--------------------------------------------------------------
-- A heap/stack check at a function or thunk entry point.
-entryHeapCheck :: LocalReg -- Function (closure environment)
+entryHeapCheck :: Maybe LocalReg -- Function (closure environment)
-> Int -- Arity -- not same as length args b/c of voids
-> [LocalReg] -- Non-void args (empty for thunk)
-> FCode ()
= do updfr_sz <- getUpdFrameOff
heapCheck True (gc_call updfr_sz) code -- The 'fun' keeps relevant CAFs alive
where
- args' = fun : args
+ args' = case fun of Just f -> f : args
+ Nothing -> args
arg_exprs = map (CmmReg . CmmLocal) args'
gc_call updfr_sz
| arity == 0 = mkJumpGC (CmmReg (CmmGlobal GCEnter1)) arg_exprs updfr_sz