ptrlist: make linearize_ptr_list() generic

The ptrlist API has a function to copy the elements of a ptrlist
into an array but it's not typed and thus needs a wrapper (or casts)
for each type it's used for. Also, 'linearize' is confusing since
this is unrelated to Sparse's linearization.

Simplify this by adding a generic (but type-safe) macro for this
with a more descriptive name: ptr_list_to_array()

Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>

ptrlist.h

@@ -84,6 +84,12 @@ extern void __free_ptr_list(struct ptr_list **);
 		(PTRLIST_TYPE(lst)) ptr_list_nth_entry(head, nth);\
 	})
 
+#define ptr_list_to_array(list, array, size) ({				\
+		struct ptr_list* head = (struct ptr_list*)(list);	\
+		CHECK_TYPE(list, *array);				\
+		linearize_ptr_list(head, (void**)array, size);		\
+	})
+
 ////////////////////////////////////////////////////////////////////////
 // API
 #define PREPARE_PTR_LIST(head, ptr) \

simplify.c

@@ -83,7 +83,7 @@ static struct basic_block *phi_parent(struct basic_block *source, pseudo_t pseud
 //	number of element, a positive number if there was
 //	more than expected and a negative one if less.
 //
-// :note: we can't reuse a function like linearize_ptr_list()
+// :note: we can't reuse ptr_list_to_array() for the phi-sources
 //	because any VOIDs in the phi-list must be ignored here
 //	as in this context they mean 'entry has been removed'.
 static int get_phisources(struct instruction *sources[], int nbr, struct instruction *insn)
@@ -116,7 +116,7 @@ static int if_convert_phi(struct instruction *insn)
 	bb = insn->bb;
 	if (get_phisources(array, 2, insn))
 		return 0;
-	if (linearize_ptr_list((struct ptr_list *)bb->parents, (void **)parents, 3) != 2)
+	if (ptr_list_to_array(bb->parents, parents, 3) != 2)
 		return 0;
 	p1 = array[0]->phi_src;
 	bb1 = array[0]->bb;