402 lines
11 KiB
C
402 lines
11 KiB
C
/* Miscellaneous utilities for GIMPLE streaming. Things that are used
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in both input and output are here.
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Copyright (C) 2009-2017 Free Software Foundation, Inc.
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Contributed by Doug Kwan <dougkwan@google.com>
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "backend.h"
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#include "tree.h"
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#include "gimple.h"
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#include "tree-streamer.h"
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#include "cgraph.h"
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#include "lto-streamer.h"
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#include "toplev.h"
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#include "lto-section-names.h"
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/* Statistics gathered during LTO, WPA and LTRANS. */
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struct lto_stats_d lto_stats;
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/* LTO uses bitmaps with different life-times. So use a separate
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obstack for all LTO bitmaps. */
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static bitmap_obstack lto_obstack;
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static bool lto_obstack_initialized;
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const char *section_name_prefix = LTO_SECTION_NAME_PREFIX;
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/* Set when streaming LTO for offloading compiler. */
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bool lto_stream_offload_p;
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/* Return a string representing LTO tag TAG. */
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const char *
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lto_tag_name (enum LTO_tags tag)
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{
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if (lto_tag_is_tree_code_p (tag))
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{
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/* For tags representing tree nodes, return the name of the
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associated tree code. */
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return get_tree_code_name (lto_tag_to_tree_code (tag));
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}
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if (lto_tag_is_gimple_code_p (tag))
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{
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/* For tags representing gimple statements, return the name of
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the associated gimple code. */
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return gimple_code_name[lto_tag_to_gimple_code (tag)];
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}
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switch (tag)
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{
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case LTO_null:
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return "LTO_null";
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case LTO_bb0:
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return "LTO_bb0";
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case LTO_bb1:
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return "LTO_bb1";
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case LTO_eh_region:
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return "LTO_eh_region";
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case LTO_function:
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return "LTO_function";
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case LTO_eh_table:
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return "LTO_eh_table";
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case LTO_ert_cleanup:
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return "LTO_ert_cleanup";
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case LTO_ert_try:
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return "LTO_ert_try";
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case LTO_ert_allowed_exceptions:
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return "LTO_ert_allowed_exceptions";
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case LTO_ert_must_not_throw:
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return "LTO_ert_must_not_throw";
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case LTO_tree_pickle_reference:
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return "LTO_tree_pickle_reference";
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case LTO_field_decl_ref:
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return "LTO_field_decl_ref";
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case LTO_function_decl_ref:
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return "LTO_function_decl_ref";
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case LTO_label_decl_ref:
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return "LTO_label_decl_ref";
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case LTO_namespace_decl_ref:
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return "LTO_namespace_decl_ref";
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case LTO_result_decl_ref:
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return "LTO_result_decl_ref";
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case LTO_ssa_name_ref:
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return "LTO_ssa_name_ref";
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case LTO_type_decl_ref:
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return "LTO_type_decl_ref";
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case LTO_type_ref:
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return "LTO_type_ref";
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case LTO_global_decl_ref:
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return "LTO_global_decl_ref";
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default:
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return "LTO_UNKNOWN";
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}
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}
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/* Allocate a bitmap from heap. Initializes the LTO obstack if necessary. */
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bitmap
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lto_bitmap_alloc (void)
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{
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if (!lto_obstack_initialized)
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{
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bitmap_obstack_initialize (<o_obstack);
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lto_obstack_initialized = true;
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}
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return BITMAP_ALLOC (<o_obstack);
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}
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/* Free bitmap B. */
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void
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lto_bitmap_free (bitmap b)
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{
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BITMAP_FREE (b);
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}
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/* Get a section name for a particular type or name. The NAME field
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is only used if SECTION_TYPE is LTO_section_function_body. For all
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others it is ignored. The callee of this function is responsible
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to free the returned name. */
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char *
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lto_get_section_name (int section_type, const char *name, struct lto_file_decl_data *f)
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{
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const char *add;
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char post[32];
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const char *sep;
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if (section_type == LTO_section_function_body)
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{
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gcc_assert (name != NULL);
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if (name[0] == '*')
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name++;
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add = name;
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sep = "";
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}
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else if (section_type < LTO_N_SECTION_TYPES)
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{
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add = lto_section_name[section_type];
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sep = ".";
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}
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else
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internal_error ("bytecode stream: unexpected LTO section %s", name);
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/* Make the section name unique so that ld -r combining sections
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doesn't confuse the reader with merged sections.
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For options don't add a ID, the option reader cannot deal with them
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and merging should be ok here. */
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if (section_type == LTO_section_opts)
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strcpy (post, "");
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else if (f != NULL)
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sprintf (post, "." HOST_WIDE_INT_PRINT_HEX_PURE, f->id);
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else
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sprintf (post, "." HOST_WIDE_INT_PRINT_HEX_PURE, get_random_seed (false));
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return concat (section_name_prefix, sep, add, post, NULL);
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}
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/* Show various memory usage statistics related to LTO. */
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void
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print_lto_report (const char *s)
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{
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unsigned i;
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fprintf (stderr, "[%s] # of input files: "
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HOST_WIDE_INT_PRINT_UNSIGNED "\n", s, lto_stats.num_input_files);
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fprintf (stderr, "[%s] # of input cgraph nodes: "
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HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
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lto_stats.num_input_cgraph_nodes);
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fprintf (stderr, "[%s] # of function bodies: "
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HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
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lto_stats.num_function_bodies);
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for (i = 0; i < NUM_TREE_CODES; i++)
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if (lto_stats.num_trees[i])
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fprintf (stderr, "[%s] # of '%s' objects read: "
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HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
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get_tree_code_name ((enum tree_code) i), lto_stats.num_trees[i]);
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if (flag_lto)
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{
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fprintf (stderr, "[%s] Compression: "
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HOST_WIDE_INT_PRINT_UNSIGNED " output bytes, "
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HOST_WIDE_INT_PRINT_UNSIGNED " compressed bytes", s,
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lto_stats.num_output_il_bytes,
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lto_stats.num_compressed_il_bytes);
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if (lto_stats.num_output_il_bytes > 0)
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{
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const float dividend = (float) lto_stats.num_compressed_il_bytes;
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const float divisor = (float) lto_stats.num_output_il_bytes;
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fprintf (stderr, " (ratio: %f)", dividend / divisor);
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}
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fprintf (stderr, "\n");
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}
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if (flag_wpa)
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{
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fprintf (stderr, "[%s] # of output files: "
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HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
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lto_stats.num_output_files);
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fprintf (stderr, "[%s] # of output symtab nodes: "
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HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
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lto_stats.num_output_symtab_nodes);
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fprintf (stderr, "[%s] # of output tree pickle references: "
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HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
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lto_stats.num_pickle_refs_output);
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fprintf (stderr, "[%s] # of output tree bodies: "
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HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
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lto_stats.num_tree_bodies_output);
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fprintf (stderr, "[%s] # callgraph partitions: "
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HOST_WIDE_INT_PRINT_UNSIGNED "\n", s,
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lto_stats.num_cgraph_partitions);
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fprintf (stderr, "[%s] Compression: "
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HOST_WIDE_INT_PRINT_UNSIGNED " input bytes, "
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HOST_WIDE_INT_PRINT_UNSIGNED " uncompressed bytes", s,
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lto_stats.num_input_il_bytes,
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lto_stats.num_uncompressed_il_bytes);
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if (lto_stats.num_input_il_bytes > 0)
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{
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const float dividend = (float) lto_stats.num_uncompressed_il_bytes;
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const float divisor = (float) lto_stats.num_input_il_bytes;
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fprintf (stderr, " (ratio: %f)", dividend / divisor);
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}
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fprintf (stderr, "\n");
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}
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for (i = 0; i < LTO_N_SECTION_TYPES; i++)
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fprintf (stderr, "[%s] Size of mmap'd section %s: "
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HOST_WIDE_INT_PRINT_UNSIGNED " bytes\n", s,
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lto_section_name[i], lto_stats.section_size[i]);
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}
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#ifdef LTO_STREAMER_DEBUG
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struct tree_hash_entry
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{
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tree key;
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intptr_t value;
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};
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struct tree_entry_hasher : nofree_ptr_hash <tree_hash_entry>
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{
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static inline hashval_t hash (const tree_hash_entry *);
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static inline bool equal (const tree_hash_entry *, const tree_hash_entry *);
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};
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inline hashval_t
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tree_entry_hasher::hash (const tree_hash_entry *e)
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{
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return htab_hash_pointer (e->key);
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}
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inline bool
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tree_entry_hasher::equal (const tree_hash_entry *e1, const tree_hash_entry *e2)
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{
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return (e1->key == e2->key);
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}
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static hash_table<tree_entry_hasher> *tree_htab;
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#endif
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/* Initialization common to the LTO reader and writer. */
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void
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lto_streamer_init (void)
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{
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/* Check that all the TS_* handled by the reader and writer routines
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match exactly the structures defined in treestruct.def. When a
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new TS_* astructure is added, the streamer should be updated to
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handle it. */
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if (flag_checking)
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streamer_check_handled_ts_structures ();
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#ifdef LTO_STREAMER_DEBUG
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tree_htab = new hash_table<tree_entry_hasher> (31);
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#endif
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}
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/* Gate function for all LTO streaming passes. */
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bool
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gate_lto_out (void)
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{
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return ((flag_generate_lto || flag_generate_offload || in_lto_p)
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/* Don't bother doing anything if the program has errors. */
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&& !seen_error ());
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}
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#ifdef LTO_STREAMER_DEBUG
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/* Add a mapping between T and ORIG_T, which is the numeric value of
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the original address of T as it was seen by the LTO writer. This
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mapping is useful when debugging streaming problems. A debugging
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session can be started on both reader and writer using ORIG_T
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as a breakpoint value in both sessions.
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Note that this mapping is transient and only valid while T is
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being reconstructed. Once T is fully built, the mapping is
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removed. */
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void
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lto_orig_address_map (tree t, intptr_t orig_t)
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{
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struct tree_hash_entry ent;
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struct tree_hash_entry **slot;
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ent.key = t;
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ent.value = orig_t;
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slot = tree_htab->find_slot (&ent, INSERT);
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gcc_assert (!*slot);
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*slot = XNEW (struct tree_hash_entry);
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**slot = ent;
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}
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/* Get the original address of T as it was seen by the writer. This
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is only valid while T is being reconstructed. */
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intptr_t
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lto_orig_address_get (tree t)
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{
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struct tree_hash_entry ent;
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struct tree_hash_entry **slot;
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ent.key = t;
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slot = tree_htab->find_slot (&ent, NO_INSERT);
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return (slot ? (*slot)->value : 0);
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}
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/* Clear the mapping of T to its original address. */
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void
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lto_orig_address_remove (tree t)
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{
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struct tree_hash_entry ent;
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struct tree_hash_entry **slot;
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ent.key = t;
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slot = tree_htab->find_slot (&ent, NO_INSERT);
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gcc_assert (slot);
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free (*slot);
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tree_htab->clear_slot (slot);
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}
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#endif
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/* Check that the version MAJOR.MINOR is the correct version number. */
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void
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lto_check_version (int major, int minor, const char *file_name)
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{
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if (major != LTO_major_version || minor != LTO_minor_version)
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fatal_error (input_location,
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"bytecode stream in file %qs generated with LTO version "
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"%d.%d instead of the expected %d.%d",
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file_name,
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major, minor,
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LTO_major_version, LTO_minor_version);
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}
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/* Initialize all the streamer hooks used for streaming GIMPLE. */
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void
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lto_streamer_hooks_init (void)
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{
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streamer_hooks_init ();
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streamer_hooks.write_tree = lto_output_tree;
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streamer_hooks.read_tree = lto_input_tree;
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streamer_hooks.input_location = lto_input_location;
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streamer_hooks.output_location = lto_output_location;
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}
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