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(push_label_level, pop_label_level): Kill. (struct binding_level): Rename level_chain to outer. Add outer_function field. Change parm_flag, function_body, keep, keep_if_subblocks to 1-bit bitfields of type bool. (current_function_level): New variable. (keep_next_level_flag, keep_next_if_subblocks): Change type to bool. (keep_next_level, declare_parm_level, warn_if_shadowing): Update to match. (struct language_function): Kill named_labels, shadowed_labels fields. (c_init_decl_processing, start_function, c_push__function_context) (c_pop_function_context): No need to muck with named_labels nor shadowed_labels. (make_binding_level): No need to clear the structure here. (pop_binding_level): Always operate on current_binding_level. Update current_function_level if necessary. (pushlevel): Don't clear named_labels. Update current_function_level if necessary. Use "true" and "false" where appropriate. (poplevel): Diagnose labels defined but not used, or vice versa, and clear out label-meanings leaving scope, while walking down the decls list, for all binding levels. Handle LABEL_DECLs appearing in the shadowed list. pop_binding_level takes no arguments. (pushdecl_function_level): Use current_function_level. (make_label, bind_label): New static functions. (declare_label): New exported function. (lookup_label, define_label): Rewritten for new data structure. (shadow_label): Kill. * c-tree.h: Prototype declare_label; don't prototype push_label_level, pop_label_level, nor shadow_label. * c-parse.in: Remove all calls to push_label_level and pop_label_level. Use declare_label for __label__ decls. * doc/extend.texi: Clarify that __label__ can be used to declare labels with local scope in any nested block, not just statement expressions. Cross-reference nested functions section from local labels section. testsuite: * gcc.dg/noncompile/label-1.c: New comprehensive test case for diagnostics of ill-formed constructs involving labels. * gcc.dg/noncompile/label-lineno-1.c: Add error regexp for the new 'previously defined here' message. From-SVN: r69597
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