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* staptree.h (struct indexable): New struct.
(classify_indexable): New function.
(classify_const_indexable): New function.
(struct symbol): Implement indexable.
(struct arrayindex): Take indexable as base.
(struct foreach_loop): Take indexable as base.
(struct print_format): New struct.
(enum stat_component_type): New enum.
(struct stat_op): New struct.
(enum historgram_type): New enum.
(struct hist_op): New struct.
(struct visitor)
(struct traversing_visitor)
(struct throwing_visitor)
(struct deep_copy_visitor): Add new visitor methods.
(require): Specialize for indexable*.
* staptree.cxx (print_format::*)
(stat_op::*)
(hist_op::*)
(indexable::*)
(traversing_visitor::*)
(throwing_visitor::*)
(deep_copy_visitor::*)
(classify_indexable)
(classify_const_indexable): Implement
(deep_copy_visitor::*): Update to use indexables.
* parse.h (parser::parse_indexable): New method.
(parser::parse_hist_op_or_bare_name): New method.
* parse.cxx (lexer::scan): Accept @ in identifiers.
(parser::parse_array_in)
(parser::parse_foreach_loop): Call parse_indexable.
(parser::parse_hist_op_or_bare_name): Implement.
(parser::parse_indexable): Implement.
(parser::parse_symbol): Accept printf, stat_ops, hist_ops.
* elaborate.h (struct typeresolution_info): Add methods for
visiting print_format, stat_op, hist_op.
* elaborate.cxx (symbol_fetcher): New class.
(get_symbol_within_expression): New function.
(get_symbol_within_indexable): New function.
(mutated_var_collector): Replace mutated_map_collector.
(no_var_mutation_during_iteration_check): Replace
no_map_mutation_during_iteration_check.
(semantic_pass_vars): Replace semantic_pass_maps.
(semantic_pass): Update call accordingly.
(symresolution_info::*) Add new visitors, teach about indexables
(typeresolution_info::*) Likewise.
* translate.cxx
(c_unparser::getiter): Take symbol, not foreach_loop.
(c_unparser::*) Add new visitors, teach about indexables.
(c_tmpcounter::*)
(delete_statement_operand_visitor::visit_arrayindex)
(c_tmpcounter_assignment::*)
(c_unparser_assignment::*): Likewise.
(hist_op_downcaster): New struct.
(expression_is_hist_op): New function.
* testsuite/buildok/printf.stp: New test for print_format.
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