alias.c (component_uses_parent_alias_set): Constify.

	* alias.c (component_uses_parent_alias_set): Constify.
	* alias.h (component_uses_parent_alias_set): Likewise.
	* cfgrtl.c (print_rtl_with_bb): Likewise.
	* double-int.c (tree_to_double_int, double_int_fits_to_tree_p,
	mpz_get_double_int): Likewise.
	* double-int.h (double_int_fits_to_tree_p, tree_to_double_int,
	mpz_get_double_int): Likewise.
	* expr.c (is_aligning_offset, undefined_operand_subword_p,
	mostly_zeros_p, all_zeros_p, safe_from_p, is_aligning_offset):
	Likewise.
	* expr.h (safe_from_p): Likewise.
	* gimple-low.c (try_catch_may_fallthru, block_may_fallthru):
	Likewise.
	* gimplify.c (should_carry_locus_p, zero_sized_field_decl,
	zero_sized_type, goa_lhs_expr_p): Likewise.
	* omp-low.c (is_variable_sized, use_pointer_for_field): Likewise.
	* rtl.h (print_rtl_with_bb): Likewise.
	* sched-vis.c (print_exp, print_value, print_pattern): Likewise.
	* tree-cfg.c (const_first_stmt, const_last_stmt): New.
	* tree-flow-inline.h (bb_stmt_list): Constify.
	(cbsi_start, cbsi_last, cbsi_end_p, cbsi_next, cbsi_prev,
	cbsi_stmt): New.
	* tree-flow.h (const_block_stmt_iterator, cbsi_start, cbsi_last,
	const_first_stmt, const_last_stmt): New.
	(block_may_fallthru, empty_block_p): Constify.
	* tree-iterator.c (EXPR_FIRST_BODY, EXPR_LAST_BODY,
	EXPR_ONLY_BODY): New.
	(expr_first, expr_last, expr_only): Use macro for body.
	(const_expr_first, const_expr_last, const_expr_only): New.
	* tree-iterator.h (const_tree_stmt_iterator, ctsi_start,
	ctsi_last, ctsi_end_p, ctsi_one_before_end_p, ctsi_next,
	ctsi_prev, ctsi_stmt): New.
	* tree-scalar-evolution.c (get_loop_exit_condition): Constify.
	* tree-scalar-evolution.h (get_loop_exit_condition): Likewise.
	* tree-ssa-loop-niter.c (loop_only_exit_p,
	derive_constant_upper_bound): Likewise.
	* tree-ssa-phiopt.c (empty_block_p): Likewise.
	* tree-ssa-threadupdate.c (redirection_block_p): Likewise.
	* tree-vectorizer.c (slpeel_can_duplicate_loop_p): Likewise.
	* tree-vectorizer.h (slpeel_can_duplicate_loop_p): Likewise.
	* tree-vrp.c (vrp_bitmap_equal_p): Likewise.
	* tree.c (get_type_static_bounds): Likewise.
	* tree.h (const_expr_first, const_expr_last, const_expr_only): New.
	(get_type_static_bounds): Constify.

From-SVN: r127483

1 files changed, 56 insertions, 1 deletions

diff --git a/gcc/tree-flow-inline.h b/gcc/tree-flow-inline.h
index 1e52d1f..63d4021 100644
--- a/gcc/tree-flow-inline.h
+++ b/gcc/tree-flow-inline.h
@@ -713,7 +713,7 @@ phi_ssa_name_p (const_tree t)
 /* Returns the list of statements in BB.  */
 
 static inline tree
-bb_stmt_list (basic_block bb)
+bb_stmt_list (const_basic_block bb)
 {
   gcc_assert (!(bb->flags & BB_RTL));
   return bb->il.tree->stmt_list;
@@ -745,6 +745,21 @@ bsi_start (basic_block bb)
   return bsi;
 }
 
+static inline const_block_stmt_iterator
+cbsi_start (const_basic_block bb)
+{
+  const_block_stmt_iterator bsi;
+  if (bb->index < NUM_FIXED_BLOCKS)
+    {
+      bsi.tsi.ptr = NULL;
+      bsi.tsi.container = NULL;
+    }
+  else
+    bsi.tsi = ctsi_start (bb_stmt_list (bb));
+  bsi.bb = bb;
+  return bsi;
+}
+
 /* Return a block statement iterator that points to the first non-label
    statement in block BB.  */
 
@@ -777,6 +792,22 @@ bsi_last (basic_block bb)
   return bsi;
 }
 
+static inline const_block_stmt_iterator
+cbsi_last (const_basic_block bb)
+{
+  const_block_stmt_iterator bsi;
+
+  if (bb->index < NUM_FIXED_BLOCKS)
+    {
+      bsi.tsi.ptr = NULL;
+      bsi.tsi.container = NULL;
+    }
+  else
+    bsi.tsi = ctsi_last (bb_stmt_list (bb));
+  bsi.bb = bb;
+  return bsi;
+}
+
 /* Return true if block statement iterator I has reached the end of
    the basic block.  */
 static inline bool
@@ -785,6 +816,12 @@ bsi_end_p (block_stmt_iterator i)
   return tsi_end_p (i.tsi);
 }
 
+static inline bool
+cbsi_end_p (const_block_stmt_iterator i)
+{
+  return ctsi_end_p (i.tsi);
+}
+
 /* Modify block statement iterator I so that it is at the next
    statement in the basic block.  */
 static inline void
@@ -793,6 +830,12 @@ bsi_next (block_stmt_iterator *i)
   tsi_next (&i->tsi);
 }
 
+static inline void
+cbsi_next (const_block_stmt_iterator *i)
+{
+  ctsi_next (&i->tsi);
+}
+
 /* Modify block statement iterator I so that it is at the previous
    statement in the basic block.  */
 static inline void
@@ -801,6 +844,12 @@ bsi_prev (block_stmt_iterator *i)
   tsi_prev (&i->tsi);
 }
 
+static inline void
+cbsi_prev (const_block_stmt_iterator *i)
+{
+  ctsi_prev (&i->tsi);
+}
+
 /* Return the statement that block statement iterator I is currently
    at.  */
 static inline tree
@@ -809,6 +858,12 @@ bsi_stmt (block_stmt_iterator i)
   return tsi_stmt (i.tsi);
 }
 
+static inline const_tree
+cbsi_stmt (const_block_stmt_iterator i)
+{
+  return ctsi_stmt (i.tsi);
+}
+
 /* Return a pointer to the statement that block statement iterator I
    is currently at.  */
 static inline tree *