2005-12-22 Dale Johannesen <dalej@apple.com>

[pf3gnuchains/gcc-fork.git] / gcc / basic-block.h

diff --git a/gcc/basic-block.h b/gcc/basic-block.h
index c2e4a16..69dba56 100644 (file)
--- a/gcc/basic-block.h
+++ b/gcc/basic-block.h
@@ -430,12 +430,12 @@ extern bool rediscover_loops_after_threading;
 /* For iterating over insns in basic block.  */
 #define FOR_BB_INSNS(BB, INSN)                 \
   for ((INSN) = BB_HEAD (BB);                  \
-       (INSN) != NEXT_INSN (BB_END (BB));      \
+       (INSN) && (INSN) != NEXT_INSN (BB_END (BB));    \
        (INSN) = NEXT_INSN (INSN))
 
 #define FOR_BB_INSNS_REVERSE(BB, INSN)         \
   for ((INSN) = BB_END (BB);                   \
-       (INSN) != PREV_INSN (BB_HEAD (BB));     \
+       (INSN) && (INSN) != PREV_INSN (BB_HEAD (BB));   \
        (INSN) = PREV_INSN (INSN))
 
 /* Cycles through _all_ basic blocks, even the fake ones (entry and
@@ -467,11 +467,12 @@ extern bitmap_obstack reg_obstack;
 #define BB_END(B)       (B)->il.rtl->end_
 
 /* Special block numbers [markers] for entry and exit.  */
-#define ENTRY_BLOCK (-1)
-#define EXIT_BLOCK (-2)
+#define ENTRY_BLOCK (0)
+#define EXIT_BLOCK (1)
+
+/* The two blocks that are always in the cfg.  */
+#define NUM_FIXED_BLOCKS (2)
 
-/* Special block number not valid for any block.  */
-#define INVALID_BLOCK (-3)
 
 #define BLOCK_NUM(INSN)              (BLOCK_FOR_INSN (INSN)->index + 0)
 #define set_block_for_insn(INSN, BB)  (BLOCK_FOR_INSN (INSN) = BB)
@@ -502,8 +503,8 @@ extern edge redirect_edge_succ_nodup (edge, basic_block);
 extern void redirect_edge_pred (edge, basic_block);
 extern basic_block create_basic_block_structure (rtx, rtx, rtx, basic_block);
 extern void clear_bb_flags (void);
-extern void flow_reverse_top_sort_order_compute (int *);
-extern int flow_depth_first_order_compute (int *, int *);
+extern int post_order_compute (int *, bool);
+extern int pre_and_rev_post_order_compute (int *, int *, bool);
 extern int dfs_enumerate_from (basic_block, int,
                               bool (*)(basic_block, void *),
                               basic_block *, int, void *);