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, 11 insertions, 2 deletions

diff --git a/gcc/tree-flow.h b/gcc/tree-flow.h
index ad0d18b..7e60dae 100644
--- a/gcc/tree-flow.h
+++ b/gcc/tree-flow.h
@@ -628,8 +628,15 @@ typedef struct {
   basic_block bb;
 } block_stmt_iterator;
 
+typedef struct {
+  const_tree_stmt_iterator tsi;
+  const_basic_block bb;
+} const_block_stmt_iterator;
+
 static inline block_stmt_iterator bsi_start (basic_block);
+static inline const_block_stmt_iterator cbsi_start (const_basic_block);
 static inline block_stmt_iterator bsi_last (basic_block);
+static inline const_block_stmt_iterator cbsi_last (const_basic_block);
 static inline block_stmt_iterator bsi_after_labels (basic_block);
 block_stmt_iterator bsi_for_stmt (tree);
 static inline bool bsi_end_p (block_stmt_iterator);
@@ -737,7 +744,9 @@ extern void print_loop_ir (FILE *);
 extern void cleanup_dead_labels (void);
 extern void group_case_labels (void);
 extern tree first_stmt (basic_block);
+extern const_tree const_first_stmt (const_basic_block);
 extern tree last_stmt (basic_block);
+extern const_tree const_last_stmt (const_basic_block);
 extern tree last_and_only_stmt (basic_block);
 extern edge find_taken_edge (basic_block, tree);
 extern basic_block label_to_block_fn (struct function *, tree);
@@ -819,7 +828,7 @@ extern tree phi_reverse (tree);
 /* In gimple-low.c  */
 extern void record_vars_into (tree, tree);
 extern void record_vars (tree);
-extern bool block_may_fallthru (tree);
+extern bool block_may_fallthru (const_tree);
 
 /* In tree-ssa-alias.c  */
 extern void dump_may_aliases_for (FILE *, tree);
@@ -959,7 +968,7 @@ extern bool vect_can_force_dr_alignment_p (tree, unsigned int);
 extern tree get_vectype_for_scalar_type (tree);
 
 /* In tree-ssa-phiopt.c */
-bool empty_block_p (basic_block);
+bool empty_block_p (const_basic_block);
 basic_block *blocks_in_phiopt_order (void);
 
 /* In tree-ssa-loop*.c  */