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Some projects need to prevent reordering of specific top level declarations with LTO, in particular declarations defining init calls. The only way to do that with LTO was to use -fno-toplevel-reorder, which stops reordering for all declarations and makes LTO partitioning less efficient. This patch adds a new no_reorder attribute that stops reordering only for the marked declaration. The program can then only mark e.g. the initcalls and leave all the other declarations alone. The patch does: - Adds the new no_reorder attribute for the C family. - Initializes a new no_reorder flag in the symtab_nodes in the function visibility flag. - Maintains the no_reorder flag when creating new nodes. - Changes the partition code to always keep a separate sorted queue of ordered nodes and flush them in order with the other nodes. This is used by all nodes with -fno-toplevel-reorder, and only the marked ones without it. Parts of the old -fno-toplevel-reorder code paths are reused. - Adds various checks throughout the tree to make no_reorder marked functions behave the same as with -fno-toplevel-reorder - Changes the LTO streamer to serialize the no_reorder attribute. gcc/c-family/: 2014-09-23 Andi Kleen <ak@linux.intel.com> * c-common.c (handle_no_reorder_attribute): New function. (c_common_attribute_table): Add no_reorder attribute. gcc/: 2014-09-23 Andi Kleen <ak@linux.intel.com> * cgraph.h (symtab_node): Add no_reorder attribute. (symbol_table::output_asm_statements): Remove. * cgraphclones.c (cgraph_node::create_clone): Copy no_reorder. (cgraph_node::create_version_clone): Dito. (symbol_table::output_asm_statements): Remove. * trans-mem.c (ipa_tm_create_version_alias): Dito. * cgraphunit.c (varpool_node::finalize_decl): Check no_reorder. (output_in_order): Add no_reorder flag. Only handle no_reorder nodes when set. (symbol_table::compile): Add separate pass for no_reorder nodes. (process_common_attributes): Set no_reorder flag in symtab node. Add node argument. (process_function_and_variable_attributes): Pass symtab nodes to process_common_attributes. * doc/extend.texi (no_reorder): Document no_reorder attribute. * lto-cgraph.c (lto_output_node): Serialize no_reorder. (lto_output_varpool_node): Dito. (input_overwrite_node): Dito. (input_varpool_node): Dito. * varpool.c (varpool_node::add): Set no_reorder attribute. (symbol_table::remove_unreferenced_decls): Handle no_reorder. (symbol_table::output_variables): Dito. * symtab.c (symtab_node::dump_base): Print no_reorder. gcc/lto/: 2014-09-23 Andi Kleen <ak@linux.intel.com> * lto-partition.c (node_cmp): Update comment. (varpool_node_cmp): Use symtab_node for comparison. (add_sorted_nodes): New function. (lto_balanced_map): Change to keep ordered queue of ordered node. Handle no_reorder attribute. From-SVN: r215537
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