middle-end: add support for per-location warning groups.

gcc/ChangeLog:

	* builtins.c (warn_string_no_nul): Replace uses of TREE_NO_WARNING,
	gimple_no_warning_p and gimple_set_no_warning with
	warning_suppressed_p, and suppress_warning.
	(c_strlen): Same.
	(maybe_warn_for_bound): Same.
	(warn_for_access): Same.
	(check_access): Same.
	(expand_builtin_strncmp): Same.
	(fold_builtin_varargs): Same.
	* calls.c (maybe_warn_nonstring_arg): Same.
	(maybe_warn_rdwr_sizes): Same.
	* cfgexpand.c (expand_call_stmt): Same.
	* cgraphunit.c (check_global_declaration): Same.
	* fold-const.c (fold_undefer_overflow_warnings): Same.
	(fold_truth_not_expr): Same.
	(fold_unary_loc): Same.
	(fold_checksum_tree): Same.
	* gimple-array-bounds.cc (array_bounds_checker::check_array_ref): Same.
	(array_bounds_checker::check_mem_ref): Same.
	(array_bounds_checker::check_addr_expr): Same.
	(array_bounds_checker::check_array_bounds): Same.
	* gimple-expr.c (copy_var_decl): Same.
	* gimple-fold.c (gimple_fold_builtin_strcpy): Same.
	(gimple_fold_builtin_strncat): Same.
	(gimple_fold_builtin_stxcpy_chk): Same.
	(gimple_fold_builtin_stpcpy): Same.
	(gimple_fold_builtin_sprintf): Same.
	(fold_stmt_1): Same.
	* gimple-ssa-isolate-paths.c (diag_returned_locals): Same.
	* gimple-ssa-nonnull-compare.c (do_warn_nonnull_compare): Same.
	* gimple-ssa-sprintf.c (handle_printf_call): Same.
	* gimple-ssa-store-merging.c (imm_store_chain_info::output_merged_store): Same.
	* gimple-ssa-warn-restrict.c (maybe_diag_overlap): Same.
	* gimple-ssa-warn-restrict.h: Adjust declarations.
	(maybe_diag_access_bounds): Replace uses of TREE_NO_WARNING,
	gimple_no_warning_p and gimple_set_no_warning with
	warning_suppressed_p, and suppress_warning.
	(check_call): Same.
	(check_bounds_or_overlap): Same.
	* gimple.c (gimple_build_call_from_tree): Same.
	* gimplify.c (gimplify_return_expr): Same.
	(gimplify_cond_expr): Same.
	(gimplify_modify_expr_complex_part): Same.
	(gimplify_modify_expr): Same.
	(gimple_push_cleanup): Same.
	(gimplify_expr): Same.
	* omp-expand.c (expand_omp_for_generic): Same.
	(expand_omp_taskloop_for_outer): Same.
	* omp-low.c (lower_rec_input_clauses): Same.
	(lower_lastprivate_clauses): Same.
	(lower_send_clauses): Same.
	(lower_omp_target): Same.
	* tree-cfg.c (pass_warn_function_return::execute): Same.
	* tree-complex.c (create_one_component_var): Same.
	* tree-inline.c (remap_gimple_op_r): Same.
	(copy_tree_body_r): Same.
	(declare_return_variable): Same.
	(expand_call_inline): Same.
	* tree-nested.c (lookup_field_for_decl): Same.
	* tree-sra.c (create_access_replacement): Same.
	(generate_subtree_copies): Same.
	* tree-ssa-ccp.c (pass_post_ipa_warn::execute): Same.
	* tree-ssa-forwprop.c (combine_cond_expr_cond): Same.
	* tree-ssa-loop-ch.c (ch_base::copy_headers): Same.
	* tree-ssa-loop-im.c (execute_sm): Same.
	* tree-ssa-phiopt.c (cond_store_replacement): Same.
	* tree-ssa-strlen.c (maybe_warn_overflow): Same.
	(handle_builtin_strcpy): Same.
	(maybe_diag_stxncpy_trunc): Same.
	(handle_builtin_stxncpy_strncat): Same.
	(handle_builtin_strcat): Same.
	* tree-ssa-uninit.c (get_no_uninit_warning): Same.
	(set_no_uninit_warning): Same.
	(uninit_undefined_value_p): Same.
	(warn_uninit): Same.
	(maybe_warn_operand): Same.
	* tree-vrp.c (compare_values_warnv): Same.
	* vr-values.c (vr_values::extract_range_for_var_from_comparison_expr): Same.
	(test_for_singularity): Same.

	* gimple.h (warning_suppressed_p): New function.
	(suppress_warning): Same.
	(copy_no_warning): Same.
	(gimple_set_block): Call gimple_set_location.
	(gimple_set_location): Call copy_warning.

1 files changed, 23 insertions, 2 deletions

diff --git a/gcc/gimple.h b/gcc/gimple.h
index e7dc2a4..be1155e 100644
--- a/gcc/gimple.h
+++ b/gcc/gimple.h
@@ -1635,6 +1635,24 @@ extern bool gimple_inexpensive_call_p (gcall *);
 extern bool stmt_can_terminate_bb_p (gimple *);
 extern location_t gimple_or_expr_nonartificial_location (gimple *, tree);
 
+/* Return the disposition for a warning (or all warnings by default)
+   for a statement.  */
+extern bool warning_suppressed_p (const gimple *, opt_code = all_warnings)
+  ATTRIBUTE_NONNULL (1);
+/* Set the disposition for a warning (or all warnings by default)
+   at a location to enabled by default.  */
+extern void suppress_warning (gimple *, opt_code = all_warnings,
+			      bool = true) ATTRIBUTE_NONNULL (1);
+
+/* Copy the warning disposition mapping from one statement to another.  */
+extern void copy_warning (gimple *, const gimple *)
+  ATTRIBUTE_NONNULL (1) ATTRIBUTE_NONNULL (2);
+/* Copy the warning disposition mapping from an expression to a statement.  */
+extern void copy_warning (gimple *, const_tree)
+  ATTRIBUTE_NONNULL (1) ATTRIBUTE_NONNULL (2);
+/* Copy the warning disposition mapping from a statement to an expression.  */
+extern void copy_warning (tree, const gimple *)
+  ATTRIBUTE_NONNULL (1) ATTRIBUTE_NONNULL (2);
 
 /* Formal (expression) temporary table handling: multiple occurrences of
    the same scalar expression are evaluated into the same temporary.  */
@@ -1855,16 +1873,17 @@ gimple_block (const gimple *g)
   return LOCATION_BLOCK (g->location);
 }
 
+/* Forward declare.  */
+static inline void gimple_set_location (gimple *, location_t);
 
 /* Set BLOCK to be the lexical scope block holding statement G.  */
 
 static inline void
 gimple_set_block (gimple *g, tree block)
 {
-  g->location = set_block (g->location, block);
+  gimple_set_location (g, set_block (g->location, block));
 }
 
-
 /* Return location information for statement G.  */
 
 static inline location_t
@@ -1887,6 +1906,8 @@ gimple_location_safe (const gimple *g)
 static inline void
 gimple_set_location (gimple *g, location_t location)
 {
+  /* Copy the no-warning data to the statement location.  */
+  copy_warning (location, g->location);
   g->location = location;
 }