/* Write the GIMPLE representation to a file stream. Copyright (C) 2009-2020 Free Software Foundation, Inc. Contributed by Kenneth Zadeck Re-implemented by Diego Novillo This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GCC; see the file COPYING3. If not see . */ #include "config.h" #include "system.h" #include "coretypes.h" #include "backend.h" #include "target.h" #include "rtl.h" #include "tree.h" #include "gimple.h" #include "tree-pass.h" #include "ssa.h" #include "gimple-streamer.h" #include "alias.h" #include "stor-layout.h" #include "gimple-iterator.h" #include "except.h" #include "lto-symtab.h" #include "cgraph.h" #include "cfgloop.h" #include "builtins.h" #include "gomp-constants.h" #include "debug.h" #include "omp-offload.h" #include "print-tree.h" #include "tree-dfa.h" #include "file-prefix-map.h" /* remap_debug_filename() */ #include "output.h" static void lto_write_tree (struct output_block*, tree, bool); /* Clear the line info stored in DATA_IN. */ static void clear_line_info (struct output_block *ob) { ob->current_file = NULL; ob->current_line = 0; ob->current_col = 0; ob->current_sysp = false; } /* Create the output block and return it. SECTION_TYPE is LTO_section_function_body or LTO_static_initializer. */ struct output_block * create_output_block (enum lto_section_type section_type) { struct output_block *ob = XCNEW (struct output_block); if (streamer_dump_file) fprintf (streamer_dump_file, "Creating output block for %s\n", lto_section_name [section_type]); ob->section_type = section_type; ob->decl_state = lto_get_out_decl_state (); ob->main_stream = XCNEW (struct lto_output_stream); ob->string_stream = XCNEW (struct lto_output_stream); ob->writer_cache = streamer_tree_cache_create (!flag_wpa, true, false); if (section_type == LTO_section_function_body) ob->cfg_stream = XCNEW (struct lto_output_stream); clear_line_info (ob); ob->string_hash_table = new hash_table (37); gcc_obstack_init (&ob->obstack); return ob; } /* Destroy the output block OB. */ void destroy_output_block (struct output_block *ob) { enum lto_section_type section_type = ob->section_type; delete ob->string_hash_table; ob->string_hash_table = NULL; free (ob->main_stream); free (ob->string_stream); if (section_type == LTO_section_function_body) free (ob->cfg_stream); streamer_tree_cache_delete (ob->writer_cache); obstack_free (&ob->obstack, NULL); free (ob); } /* Look up NODE in the type table and write the index for it to OB. */ static void output_type_ref (struct output_block *ob, tree node) { streamer_write_record_start (ob, LTO_type_ref); lto_output_type_ref_index (ob->decl_state, ob->main_stream, node); } /* Wrapper around variably_modified_type_p avoiding type modification during WPA streaming. */ static bool lto_variably_modified_type_p (tree type) { return (in_lto_p ? TYPE_LANG_FLAG_0 (TYPE_MAIN_VARIANT (type)) : variably_modified_type_p (type, NULL_TREE)); } /* Return true if tree node T is written to various tables. For these nodes, we sometimes want to write their phyiscal representation (via lto_output_tree), and sometimes we need to emit an index reference into a table (via lto_output_tree_ref). */ static bool tree_is_indexable (tree t) { /* Parameters and return values of functions of variably modified types must go to global stream, because they may be used in the type definition. */ if ((TREE_CODE (t) == PARM_DECL || TREE_CODE (t) == RESULT_DECL) && DECL_CONTEXT (t)) return lto_variably_modified_type_p (TREE_TYPE (DECL_CONTEXT (t))); /* IMPORTED_DECL is put into BLOCK and thus it never can be shared. We should no longer need to stream it. */ else if (TREE_CODE (t) == IMPORTED_DECL) gcc_unreachable (); else if (TREE_CODE (t) == LABEL_DECL) return FORCED_LABEL (t) || DECL_NONLOCAL (t); else if (((VAR_P (t) && !TREE_STATIC (t)) || TREE_CODE (t) == TYPE_DECL || TREE_CODE (t) == CONST_DECL || TREE_CODE (t) == NAMELIST_DECL) && decl_function_context (t)) return false; else if (TREE_CODE (t) == DEBUG_EXPR_DECL) return false; /* Variably modified types need to be streamed alongside function bodies because they can refer to local entities. Together with them we have to localize their members as well. ??? In theory that includes non-FIELD_DECLs as well. */ else if (TYPE_P (t) && lto_variably_modified_type_p (t)) return false; else if (TREE_CODE (t) == FIELD_DECL && lto_variably_modified_type_p (DECL_CONTEXT (t))) return false; else return (TYPE_P (t) || DECL_P (t) || TREE_CODE (t) == SSA_NAME); } /* Output info about new location into bitpack BP. After outputting bitpack, lto_output_location_data has to be done to output actual data. */ void lto_output_location (struct output_block *ob, struct bitpack_d *bp, location_t loc) { expanded_location xloc; loc = LOCATION_LOCUS (loc); bp_pack_int_in_range (bp, 0, RESERVED_LOCATION_COUNT, loc < RESERVED_LOCATION_COUNT ? loc : RESERVED_LOCATION_COUNT); if (loc < RESERVED_LOCATION_COUNT) return; xloc = expand_location (loc); bp_pack_value (bp, ob->current_file != xloc.file, 1); bp_pack_value (bp, ob->current_line != xloc.line, 1); bp_pack_value (bp, ob->current_col != xloc.column, 1); if (ob->current_file != xloc.file) { bp_pack_string (ob, bp, remap_debug_filename (xloc.file), true); bp_pack_value (bp, xloc.sysp, 1); } ob->current_file = xloc.file; ob->current_sysp = xloc.sysp; if (ob->current_line != xloc.line) bp_pack_var_len_unsigned (bp, xloc.line); ob->current_line = xloc.line; if (ob->current_col != xloc.column) bp_pack_var_len_unsigned (bp, xloc.column); ob->current_col = xloc.column; } /* If EXPR is an indexable tree node, output a reference to it to output block OB. Otherwise, output the physical representation of EXPR to OB. */ static void lto_output_tree_ref (struct output_block *ob, tree expr) { enum tree_code code; if (TYPE_P (expr)) { output_type_ref (ob, expr); return; } code = TREE_CODE (expr); switch (code) { case SSA_NAME: streamer_write_record_start (ob, LTO_ssa_name_ref); streamer_write_uhwi (ob, SSA_NAME_VERSION (expr)); break; case FIELD_DECL: streamer_write_record_start (ob, LTO_field_decl_ref); lto_output_field_decl_index (ob->decl_state, ob->main_stream, expr); break; case FUNCTION_DECL: streamer_write_record_start (ob, LTO_function_decl_ref); lto_output_fn_decl_index (ob->decl_state, ob->main_stream, expr); break; case VAR_DECL: case DEBUG_EXPR_DECL: gcc_assert (decl_function_context (expr) == NULL || TREE_STATIC (expr)); /* FALLTHRU */ case PARM_DECL: streamer_write_record_start (ob, LTO_global_decl_ref); lto_output_var_decl_index (ob->decl_state, ob->main_stream, expr); break; case CONST_DECL: streamer_write_record_start (ob, LTO_const_decl_ref); lto_output_var_decl_index (ob->decl_state, ob->main_stream, expr); break; case IMPORTED_DECL: gcc_assert (decl_function_context (expr) == NULL); streamer_write_record_start (ob, LTO_imported_decl_ref); lto_output_var_decl_index (ob->decl_state, ob->main_stream, expr); break; case TYPE_DECL: streamer_write_record_start (ob, LTO_type_decl_ref); lto_output_type_decl_index (ob->decl_state, ob->main_stream, expr); break; case NAMELIST_DECL: streamer_write_record_start (ob, LTO_namelist_decl_ref); lto_output_var_decl_index (ob->decl_state, ob->main_stream, expr); break; case NAMESPACE_DECL: streamer_write_record_start (ob, LTO_namespace_decl_ref); lto_output_namespace_decl_index (ob->decl_state, ob->main_stream, expr); break; case LABEL_DECL: streamer_write_record_start (ob, LTO_label_decl_ref); lto_output_var_decl_index (ob->decl_state, ob->main_stream, expr); break; case RESULT_DECL: streamer_write_record_start (ob, LTO_result_decl_ref); lto_output_var_decl_index (ob->decl_state, ob->main_stream, expr); break; case TRANSLATION_UNIT_DECL: streamer_write_record_start (ob, LTO_translation_unit_decl_ref); lto_output_var_decl_index (ob->decl_state, ob->main_stream, expr); break; default: /* No other node is indexable, so it should have been handled by lto_output_tree. */ gcc_unreachable (); } } /* Return true if EXPR is a tree node that can be written to disk. */ static inline bool lto_is_streamable (tree expr) { enum tree_code code = TREE_CODE (expr); /* Notice that we reject SSA_NAMEs as well. We only emit the SSA name version in lto_output_tree_ref (see output_ssa_names). */ return !is_lang_specific (expr) && code != SSA_NAME && code != LANG_TYPE && code != MODIFY_EXPR && code != INIT_EXPR && code != TARGET_EXPR && code != BIND_EXPR && code != WITH_CLEANUP_EXPR && code != STATEMENT_LIST && (code == CASE_LABEL_EXPR || code == DECL_EXPR || TREE_CODE_CLASS (code) != tcc_statement); } /* Very rough estimate of streaming size of the initializer. If we ignored presence of strings, we could simply just count number of non-indexable tree nodes and number of references to indexable nodes. Strings however may be very large and we do not want to dump them int othe global stream. Count the size of initializer until the size in DATA is positive. */ static tree subtract_estimated_size (tree *tp, int *ws, void *data) { long *sum = (long *)data; if (tree_is_indexable (*tp)) { /* Indexable tree is one reference to global stream. Guess it may be about 4 bytes. */ *sum -= 4; *ws = 0; } /* String table entry + base of tree node needs to be streamed. */ if (TREE_CODE (*tp) == STRING_CST) *sum -= TREE_STRING_LENGTH (*tp) + 8; else { /* Identifiers are also variable length but should not appear naked in constructor. */ gcc_checking_assert (TREE_CODE (*tp) != IDENTIFIER_NODE); /* We do not really make attempt to work out size of pickled tree, as it is very variable. Make it bigger than the reference. */ *sum -= 16; } if (*sum < 0) return *tp; return NULL_TREE; } /* For EXPR lookup and return what we want to stream to OB as DECL_INITIAL. */ static tree get_symbol_initial_value (lto_symtab_encoder_t encoder, tree expr) { gcc_checking_assert (DECL_P (expr) && TREE_CODE (expr) != FUNCTION_DECL && TREE_CODE (expr) != TRANSLATION_UNIT_DECL); /* Handle DECL_INITIAL for symbols. */ tree initial = DECL_INITIAL (expr); if (VAR_P (expr) && (TREE_STATIC (expr) || DECL_EXTERNAL (expr)) && !DECL_IN_CONSTANT_POOL (expr) && initial) { varpool_node *vnode; /* Extra section needs about 30 bytes; do not produce it for simple scalar values. */ if (!(vnode = varpool_node::get (expr)) || !lto_symtab_encoder_encode_initializer_p (encoder, vnode)) initial = error_mark_node; if (initial != error_mark_node) { long max_size = 30; if (walk_tree (&initial, subtract_estimated_size, (void *)&max_size, NULL)) initial = error_mark_node; } } return initial; } /* Write a physical representation of tree node EXPR to output block OB. If REF_P is true, the leaves of EXPR are emitted as references via lto_output_tree_ref. IX is the index into the streamer cache where EXPR is stored. */ static void lto_write_tree_1 (struct output_block *ob, tree expr, bool ref_p) { /* Pack all the non-pointer fields in EXPR into a bitpack and write the resulting bitpack. */ streamer_write_tree_bitfields (ob, expr); /* Write all the pointer fields in EXPR. */ streamer_write_tree_body (ob, expr, ref_p); /* Write any LTO-specific data to OB. */ if (DECL_P (expr) && TREE_CODE (expr) != FUNCTION_DECL && TREE_CODE (expr) != TRANSLATION_UNIT_DECL) { /* Handle DECL_INITIAL for symbols. */ tree initial = get_symbol_initial_value (ob->decl_state->symtab_node_encoder, expr); stream_write_tree (ob, initial, ref_p); } /* Stream references to early generated DIEs. Keep in sync with the trees handled in dwarf2out_die_ref_for_decl. */ if ((DECL_P (expr) && TREE_CODE (expr) != FIELD_DECL && TREE_CODE (expr) != DEBUG_EXPR_DECL && TREE_CODE (expr) != TYPE_DECL) || TREE_CODE (expr) == BLOCK) { const char *sym; unsigned HOST_WIDE_INT off; if (debug_info_level > DINFO_LEVEL_NONE && debug_hooks->die_ref_for_decl (expr, &sym, &off)) { streamer_write_string (ob, ob->main_stream, sym, true); streamer_write_uhwi (ob, off); } else streamer_write_string (ob, ob->main_stream, NULL, true); } } /* Write a physical representation of tree node EXPR to output block OB. If REF_P is true, the leaves of EXPR are emitted as references via lto_output_tree_ref. IX is the index into the streamer cache where EXPR is stored. */ static void lto_write_tree (struct output_block *ob, tree expr, bool ref_p) { if (!lto_is_streamable (expr)) internal_error ("tree code %qs is not supported in LTO streams", get_tree_code_name (TREE_CODE (expr))); /* Write the header, containing everything needed to materialize EXPR on the reading side. */ streamer_write_tree_header (ob, expr); lto_write_tree_1 (ob, expr, ref_p); /* Mark the end of EXPR. */ streamer_write_zero (ob); } /* Emit the physical representation of tree node EXPR to output block OB, If THIS_REF_P is true, the leaves of EXPR are emitted as references via lto_output_tree_ref. REF_P is used for streaming siblings of EXPR. */ static void lto_output_tree_1 (struct output_block *ob, tree expr, hashval_t hash, bool ref_p, bool this_ref_p) { unsigned ix; gcc_checking_assert (expr != NULL_TREE && !(this_ref_p && tree_is_indexable (expr))); bool exists_p = streamer_tree_cache_insert (ob->writer_cache, expr, hash, &ix); gcc_assert (!exists_p); if (TREE_CODE (expr) == INTEGER_CST && !TREE_OVERFLOW (expr)) { /* Shared INTEGER_CST nodes are special because they need their original type to be materialized by the reader (to implement TYPE_CACHED_VALUES). */ streamer_write_integer_cst (ob, expr, ref_p); } else { /* This is the first time we see EXPR, write its fields to OB. */ lto_write_tree (ob, expr, ref_p); } } class DFS { public: DFS (struct output_block *ob, tree expr, bool ref_p, bool this_ref_p, bool single_p); ~DFS (); struct scc_entry { tree t; hashval_t hash; }; auto_vec sccstack; private: struct sccs { unsigned int dfsnum; unsigned int low; }; struct worklist { tree expr; sccs *from_state; sccs *cstate; bool ref_p; bool this_ref_p; }; static int scc_entry_compare (const void *, const void *); void DFS_write_tree_body (struct output_block *ob, tree expr, sccs *expr_state, bool ref_p); void DFS_write_tree (struct output_block *ob, sccs *from_state, tree expr, bool ref_p, bool this_ref_p); hashval_t hash_scc (struct output_block *ob, unsigned first, unsigned size, bool ref_p, bool this_ref_p); hash_map sccstate; auto_vec worklist_vec; struct obstack sccstate_obstack; }; /* Emit the physical representation of tree node EXPR to output block OB, using depth-first search on the subgraph. If THIS_REF_P is true, the leaves of EXPR are emitted as references via lto_output_tree_ref. REF_P is used for streaming siblings of EXPR. If SINGLE_P is true, this is for a rewalk of a single leaf SCC. */ DFS::DFS (struct output_block *ob, tree expr, bool ref_p, bool this_ref_p, bool single_p) { unsigned int next_dfs_num = 1; gcc_obstack_init (&sccstate_obstack); DFS_write_tree (ob, NULL, expr, ref_p, this_ref_p); while (!worklist_vec.is_empty ()) { worklist &w = worklist_vec.last (); expr = w.expr; sccs *from_state = w.from_state; sccs *cstate = w.cstate; ref_p = w.ref_p; this_ref_p = w.this_ref_p; if (cstate == NULL) { sccs **slot = &sccstate.get_or_insert (expr); cstate = *slot; if (cstate) { gcc_checking_assert (from_state); if (cstate->dfsnum < from_state->dfsnum) from_state->low = MIN (cstate->dfsnum, from_state->low); worklist_vec.pop (); continue; } scc_entry e = { expr, 0 }; /* Not yet visited. DFS recurse and push it onto the stack. */ *slot = cstate = XOBNEW (&sccstate_obstack, struct sccs); sccstack.safe_push (e); cstate->dfsnum = next_dfs_num++; cstate->low = cstate->dfsnum; w.cstate = cstate; if (TREE_CODE (expr) == INTEGER_CST && !TREE_OVERFLOW (expr)) DFS_write_tree (ob, cstate, TREE_TYPE (expr), ref_p, ref_p); else { DFS_write_tree_body (ob, expr, cstate, ref_p); /* Walk any LTO-specific edges. */ if (DECL_P (expr) && TREE_CODE (expr) != FUNCTION_DECL && TREE_CODE (expr) != TRANSLATION_UNIT_DECL) { /* Handle DECL_INITIAL for symbols. */ tree initial = get_symbol_initial_value (ob->decl_state->symtab_node_encoder, expr); DFS_write_tree (ob, cstate, initial, ref_p, ref_p); } } continue; } /* See if we found an SCC. */ if (cstate->low == cstate->dfsnum) { unsigned first, size; tree x; /* If we are re-walking a single leaf SCC just pop it, let earlier worklist item access the sccstack. */ if (single_p) { worklist_vec.pop (); continue; } /* Pop the SCC and compute its size. */ first = sccstack.length (); do { x = sccstack[--first].t; } while (x != expr); size = sccstack.length () - first; /* No need to compute hashes for LTRANS units, we don't perform any merging there. */ hashval_t scc_hash = 0; unsigned scc_entry_len = 0; if (!flag_wpa) { scc_hash = hash_scc (ob, first, size, ref_p, this_ref_p); /* Put the entries with the least number of collisions first. */ unsigned entry_start = 0; scc_entry_len = size + 1; for (unsigned i = 0; i < size;) { unsigned from = i; for (i = i + 1; i < size && (sccstack[first + i].hash == sccstack[first + from].hash); ++i) ; if (i - from < scc_entry_len) { scc_entry_len = i - from; entry_start = from; } } for (unsigned i = 0; i < scc_entry_len; ++i) std::swap (sccstack[first + i], sccstack[first + entry_start + i]); /* We already sorted SCC deterministically in hash_scc. */ /* Check that we have only one SCC. Naturally we may have conflicts if hash function is not strong enough. Lets see how far this gets. */ gcc_checking_assert (scc_entry_len == 1); } /* Write LTO_tree_scc. */ streamer_write_record_start (ob, LTO_tree_scc); streamer_write_uhwi (ob, size); streamer_write_uhwi (ob, scc_hash); /* Write size-1 SCCs without wrapping them inside SCC bundles. All INTEGER_CSTs need to be handled this way as we need their type to materialize them. Also builtins are handled this way. ??? We still wrap these in LTO_tree_scc so at the input side we can properly identify the tree we want to ultimatively return. */ if (size == 1) lto_output_tree_1 (ob, expr, scc_hash, ref_p, this_ref_p); else { /* Write the size of the SCC entry candidates. */ streamer_write_uhwi (ob, scc_entry_len); /* Write all headers and populate the streamer cache. */ for (unsigned i = 0; i < size; ++i) { hashval_t hash = sccstack[first+i].hash; tree t = sccstack[first+i].t; bool exists_p = streamer_tree_cache_insert (ob->writer_cache, t, hash, NULL); gcc_assert (!exists_p); if (!lto_is_streamable (t)) internal_error ("tree code %qs is not supported " "in LTO streams", get_tree_code_name (TREE_CODE (t))); /* Write the header, containing everything needed to materialize EXPR on the reading side. */ streamer_write_tree_header (ob, t); } /* Write the bitpacks and tree references. */ for (unsigned i = 0; i < size; ++i) { lto_write_tree_1 (ob, sccstack[first+i].t, ref_p); /* Mark the end of the tree. */ streamer_write_zero (ob); } } /* Finally truncate the vector. */ sccstack.truncate (first); if (from_state) from_state->low = MIN (from_state->low, cstate->low); worklist_vec.pop (); continue; } gcc_checking_assert (from_state); from_state->low = MIN (from_state->low, cstate->low); if (cstate->dfsnum < from_state->dfsnum) from_state->low = MIN (cstate->dfsnum, from_state->low); worklist_vec.pop (); } } DFS::~DFS () { obstack_free (&sccstate_obstack, NULL); } /* Handle the tree EXPR in the DFS walk with SCC state EXPR_STATE and DFS recurse for all tree edges originating from it. */ void DFS::DFS_write_tree_body (struct output_block *ob, tree expr, sccs *expr_state, bool ref_p) { #define DFS_follow_tree_edge(DEST) \ DFS_write_tree (ob, expr_state, DEST, ref_p, ref_p) enum tree_code code; if (streamer_dump_file) { print_node_brief (streamer_dump_file, " Streaming ", expr, 4); fprintf (streamer_dump_file, " to %s\n", lto_section_name [ob->section_type]); } code = TREE_CODE (expr); if (CODE_CONTAINS_STRUCT (code, TS_TYPED)) { if (TREE_CODE (expr) != IDENTIFIER_NODE) DFS_follow_tree_edge (TREE_TYPE (expr)); } if (CODE_CONTAINS_STRUCT (code, TS_VECTOR)) { unsigned int count = vector_cst_encoded_nelts (expr); for (unsigned int i = 0; i < count; ++i) DFS_follow_tree_edge (VECTOR_CST_ENCODED_ELT (expr, i)); } if (CODE_CONTAINS_STRUCT (code, TS_POLY_INT_CST)) for (unsigned int i = 0; i < NUM_POLY_INT_COEFFS; ++i) DFS_follow_tree_edge (POLY_INT_CST_COEFF (expr, i)); if (CODE_CONTAINS_STRUCT (code, TS_COMPLEX)) { DFS_follow_tree_edge (TREE_REALPART (expr)); DFS_follow_tree_edge (TREE_IMAGPART (expr)); } if (CODE_CONTAINS_STRUCT (code, TS_DECL_MINIMAL)) { /* Drop names that were created for anonymous entities. */ if (DECL_NAME (expr) && TREE_CODE (DECL_NAME (expr)) == IDENTIFIER_NODE && IDENTIFIER_ANON_P (DECL_NAME (expr))) ; else DFS_follow_tree_edge (DECL_NAME (expr)); if (TREE_CODE (expr) != TRANSLATION_UNIT_DECL && ! DECL_CONTEXT (expr)) DFS_follow_tree_edge ((*all_translation_units)[0]); else DFS_follow_tree_edge (DECL_CONTEXT (expr)); } if (CODE_CONTAINS_STRUCT (code, TS_DECL_COMMON)) { DFS_follow_tree_edge (DECL_SIZE (expr)); DFS_follow_tree_edge (DECL_SIZE_UNIT (expr)); /* Note, DECL_INITIAL is not handled here. Since DECL_INITIAL needs special handling in LTO, it must be handled by streamer hooks. */ DFS_follow_tree_edge (DECL_ATTRIBUTES (expr)); /* We use DECL_ABSTRACT_ORIGIN == error_mark_node to mark declarations which should be eliminated by decl merging. Be sure none leaks to this point. */ gcc_assert (DECL_ABSTRACT_ORIGIN (expr) != error_mark_node); DFS_follow_tree_edge (DECL_ABSTRACT_ORIGIN (expr)); if ((VAR_P (expr) || TREE_CODE (expr) == PARM_DECL) && DECL_HAS_VALUE_EXPR_P (expr)) DFS_follow_tree_edge (DECL_VALUE_EXPR (expr)); if (VAR_P (expr) && DECL_HAS_DEBUG_EXPR_P (expr)) DFS_follow_tree_edge (DECL_DEBUG_EXPR (expr)); } if (CODE_CONTAINS_STRUCT (code, TS_DECL_WITH_VIS)) { /* Make sure we don't inadvertently set the assembler name. */ if (DECL_ASSEMBLER_NAME_SET_P (expr)) DFS_follow_tree_edge (DECL_ASSEMBLER_NAME (expr)); } if (CODE_CONTAINS_STRUCT (code, TS_FIELD_DECL)) { DFS_follow_tree_edge (DECL_FIELD_OFFSET (expr)); DFS_follow_tree_edge (DECL_BIT_FIELD_TYPE (expr)); DFS_follow_tree_edge (DECL_BIT_FIELD_REPRESENTATIVE (expr)); DFS_follow_tree_edge (DECL_FIELD_BIT_OFFSET (expr)); gcc_checking_assert (!DECL_FCONTEXT (expr)); } if (CODE_CONTAINS_STRUCT (code, TS_FUNCTION_DECL)) { gcc_checking_assert (DECL_VINDEX (expr) == NULL); DFS_follow_tree_edge (DECL_FUNCTION_PERSONALITY (expr)); DFS_follow_tree_edge (DECL_FUNCTION_SPECIFIC_TARGET (expr)); DFS_follow_tree_edge (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (expr)); } if (CODE_CONTAINS_STRUCT (code, TS_TYPE_COMMON)) { DFS_follow_tree_edge (TYPE_SIZE (expr)); DFS_follow_tree_edge (TYPE_SIZE_UNIT (expr)); DFS_follow_tree_edge (TYPE_ATTRIBUTES (expr)); DFS_follow_tree_edge (TYPE_NAME (expr)); /* Do not follow TYPE_POINTER_TO or TYPE_REFERENCE_TO. They will be reconstructed during fixup. */ /* Do not follow TYPE_NEXT_VARIANT, we reconstruct the variant lists during fixup. */ DFS_follow_tree_edge (TYPE_MAIN_VARIANT (expr)); DFS_follow_tree_edge (TYPE_CONTEXT (expr)); /* TYPE_CANONICAL is re-computed during type merging, so no need to follow it here. */ /* Do not stream TYPE_STUB_DECL; it is not needed by LTO but currently it cannot be freed by free_lang_data without triggering ICEs in langhooks. */ } if (CODE_CONTAINS_STRUCT (code, TS_TYPE_NON_COMMON)) { if (TREE_CODE (expr) == ENUMERAL_TYPE) DFS_follow_tree_edge (TYPE_VALUES (expr)); else if (TREE_CODE (expr) == ARRAY_TYPE) DFS_follow_tree_edge (TYPE_DOMAIN (expr)); else if (RECORD_OR_UNION_TYPE_P (expr)) for (tree t = TYPE_FIELDS (expr); t; t = TREE_CHAIN (t)) DFS_follow_tree_edge (t); else if (TREE_CODE (expr) == FUNCTION_TYPE || TREE_CODE (expr) == METHOD_TYPE) DFS_follow_tree_edge (TYPE_ARG_TYPES (expr)); if (!POINTER_TYPE_P (expr)) DFS_follow_tree_edge (TYPE_MIN_VALUE_RAW (expr)); DFS_follow_tree_edge (TYPE_MAX_VALUE_RAW (expr)); } if (CODE_CONTAINS_STRUCT (code, TS_LIST)) { DFS_follow_tree_edge (TREE_PURPOSE (expr)); DFS_follow_tree_edge (TREE_VALUE (expr)); DFS_follow_tree_edge (TREE_CHAIN (expr)); } if (CODE_CONTAINS_STRUCT (code, TS_VEC)) { for (int i = 0; i < TREE_VEC_LENGTH (expr); i++) DFS_follow_tree_edge (TREE_VEC_ELT (expr, i)); } if (CODE_CONTAINS_STRUCT (code, TS_EXP)) { for (int i = 0; i < TREE_OPERAND_LENGTH (expr); i++) DFS_follow_tree_edge (TREE_OPERAND (expr, i)); DFS_follow_tree_edge (TREE_BLOCK (expr)); } if (CODE_CONTAINS_STRUCT (code, TS_BLOCK)) { for (tree t = BLOCK_VARS (expr); t; t = TREE_CHAIN (t)) { /* We would have to stream externals in the block chain as non-references but we should have dropped them in free-lang-data. */ gcc_assert (!VAR_OR_FUNCTION_DECL_P (t) || !DECL_EXTERNAL (t)); DFS_follow_tree_edge (t); } DFS_follow_tree_edge (BLOCK_SUPERCONTEXT (expr)); DFS_follow_tree_edge (BLOCK_ABSTRACT_ORIGIN (expr)); /* Do not follow BLOCK_NONLOCALIZED_VARS. We cannot handle debug information for early inlined BLOCKs so drop it on the floor instead of ICEing in dwarf2out.c. */ /* BLOCK_FRAGMENT_ORIGIN and BLOCK_FRAGMENT_CHAIN is not live at LTO streaming time. */ /* Do not output BLOCK_SUBBLOCKS. Instead on streaming-in this list is re-constructed from BLOCK_SUPERCONTEXT. */ } if (CODE_CONTAINS_STRUCT (code, TS_BINFO)) { unsigned i; tree t; /* Note that the number of BINFO slots has already been emitted in EXPR's header (see streamer_write_tree_header) because this length is needed to build the empty BINFO node on the reader side. */ FOR_EACH_VEC_ELT (*BINFO_BASE_BINFOS (expr), i, t) DFS_follow_tree_edge (t); DFS_follow_tree_edge (BINFO_OFFSET (expr)); DFS_follow_tree_edge (BINFO_VTABLE (expr)); /* Do not walk BINFO_INHERITANCE_CHAIN, BINFO_SUBVTT_INDEX, BINFO_BASE_ACCESSES and BINFO_VPTR_INDEX; these are used by C++ FE only. */ } if (CODE_CONTAINS_STRUCT (code, TS_CONSTRUCTOR)) { unsigned i; tree index, value; FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (expr), i, index, value) { DFS_follow_tree_edge (index); DFS_follow_tree_edge (value); } } if (code == OMP_CLAUSE) { int i; for (i = 0; i < omp_clause_num_ops[OMP_CLAUSE_CODE (expr)]; i++) DFS_follow_tree_edge (OMP_CLAUSE_OPERAND (expr, i)); DFS_follow_tree_edge (OMP_CLAUSE_CHAIN (expr)); } #undef DFS_follow_tree_edge } /* Return a hash value for the tree T. CACHE holds hash values of trees outside current SCC. MAP, if non-NULL, may hold hash values if trees inside current SCC. */ static hashval_t hash_tree (struct streamer_tree_cache_d *cache, hash_map *map, tree t) { inchash::hash hstate; #define visit(SIBLING) \ do { \ unsigned ix; \ if (!SIBLING) \ hstate.add_int (0); \ else if (streamer_tree_cache_lookup (cache, SIBLING, &ix)) \ hstate.add_int (streamer_tree_cache_get_hash (cache, ix)); \ else if (map) \ hstate.add_int (*map->get (SIBLING)); \ else \ hstate.add_int (1); \ } while (0) /* Hash TS_BASE. */ enum tree_code code = TREE_CODE (t); hstate.add_int (code); if (!TYPE_P (t)) { hstate.add_flag (TREE_SIDE_EFFECTS (t)); hstate.add_flag (TREE_CONSTANT (t)); hstate.add_flag (TREE_READONLY (t)); hstate.add_flag (TREE_PUBLIC (t)); } hstate.add_flag (TREE_ADDRESSABLE (t)); hstate.add_flag (TREE_THIS_VOLATILE (t)); if (DECL_P (t)) hstate.add_flag (DECL_UNSIGNED (t)); else if (TYPE_P (t)) hstate.add_flag (TYPE_UNSIGNED (t)); if (TYPE_P (t)) hstate.add_flag (TYPE_ARTIFICIAL (t)); else hstate.add_flag (TREE_NO_WARNING (t)); hstate.add_flag (TREE_NOTHROW (t)); hstate.add_flag (TREE_STATIC (t)); hstate.add_flag (TREE_PROTECTED (t)); hstate.add_flag (TREE_DEPRECATED (t)); if (code != TREE_BINFO) hstate.add_flag (TREE_PRIVATE (t)); if (TYPE_P (t)) { hstate.add_flag (AGGREGATE_TYPE_P (t) ? TYPE_REVERSE_STORAGE_ORDER (t) : TYPE_SATURATING (t)); hstate.add_flag (TYPE_ADDR_SPACE (t)); } else if (code == SSA_NAME) hstate.add_flag (SSA_NAME_IS_DEFAULT_DEF (t)); hstate.commit_flag (); if (CODE_CONTAINS_STRUCT (code, TS_INT_CST)) hstate.add_wide_int (wi::to_widest (t)); if (CODE_CONTAINS_STRUCT (code, TS_REAL_CST)) { REAL_VALUE_TYPE r = TREE_REAL_CST (t); hstate.add_flag (r.cl); hstate.add_flag (r.sign); hstate.add_flag (r.signalling); hstate.add_flag (r.canonical); hstate.commit_flag (); hstate.add_int (r.uexp); hstate.add (r.sig, sizeof (r.sig)); } if (CODE_CONTAINS_STRUCT (code, TS_FIXED_CST)) { FIXED_VALUE_TYPE f = TREE_FIXED_CST (t); hstate.add_int (f.mode); hstate.add_int (f.data.low); hstate.add_int (f.data.high); } if (CODE_CONTAINS_STRUCT (code, TS_DECL_COMMON)) { hstate.add_hwi (DECL_MODE (t)); hstate.add_flag (DECL_NONLOCAL (t)); hstate.add_flag (DECL_VIRTUAL_P (t)); hstate.add_flag (DECL_IGNORED_P (t)); hstate.add_flag (DECL_ABSTRACT_P (t)); hstate.add_flag (DECL_ARTIFICIAL (t)); hstate.add_flag (DECL_USER_ALIGN (t)); hstate.add_flag (DECL_PRESERVE_P (t)); hstate.add_flag (DECL_EXTERNAL (t)); hstate.add_flag (DECL_GIMPLE_REG_P (t)); hstate.commit_flag (); hstate.add_int (DECL_ALIGN (t)); if (code == LABEL_DECL) { hstate.add_int (EH_LANDING_PAD_NR (t)); hstate.add_int (LABEL_DECL_UID (t)); } else if (code == FIELD_DECL) { hstate.add_flag (DECL_PACKED (t)); hstate.add_flag (DECL_NONADDRESSABLE_P (t)); hstate.add_flag (DECL_PADDING_P (t)); hstate.add_flag (DECL_FIELD_ABI_IGNORED (t)); hstate.add_int (DECL_OFFSET_ALIGN (t)); } else if (code == VAR_DECL) { hstate.add_flag (DECL_HAS_DEBUG_EXPR_P (t)); hstate.add_flag (DECL_NONLOCAL_FRAME (t)); } if (code == RESULT_DECL || code == PARM_DECL || code == VAR_DECL) { hstate.add_flag (DECL_BY_REFERENCE (t)); if (code == VAR_DECL || code == PARM_DECL) hstate.add_flag (DECL_HAS_VALUE_EXPR_P (t)); } hstate.commit_flag (); } if (CODE_CONTAINS_STRUCT (code, TS_DECL_WRTL)) hstate.add_int (DECL_REGISTER (t)); if (CODE_CONTAINS_STRUCT (code, TS_DECL_WITH_VIS)) { hstate.add_flag (DECL_COMMON (t)); hstate.add_flag (DECL_DLLIMPORT_P (t)); hstate.add_flag (DECL_WEAK (t)); hstate.add_flag (DECL_SEEN_IN_BIND_EXPR_P (t)); hstate.add_flag (DECL_COMDAT (t)); hstate.add_flag (DECL_VISIBILITY_SPECIFIED (t)); hstate.add_int (DECL_VISIBILITY (t)); if (code == VAR_DECL) { /* DECL_IN_TEXT_SECTION is set during final asm output only. */ hstate.add_flag (DECL_HARD_REGISTER (t)); hstate.add_flag (DECL_IN_CONSTANT_POOL (t)); } if (TREE_CODE (t) == FUNCTION_DECL) { hstate.add_flag (DECL_FINAL_P (t)); hstate.add_flag (DECL_CXX_CONSTRUCTOR_P (t)); hstate.add_flag (DECL_CXX_DESTRUCTOR_P (t)); } hstate.commit_flag (); } if (CODE_CONTAINS_STRUCT (code, TS_FUNCTION_DECL)) { hstate.add_int (DECL_BUILT_IN_CLASS (t)); hstate.add_flag (DECL_STATIC_CONSTRUCTOR (t)); hstate.add_flag (DECL_STATIC_DESTRUCTOR (t)); hstate.add_flag (FUNCTION_DECL_DECL_TYPE (t)); hstate.add_flag (DECL_UNINLINABLE (t)); hstate.add_flag (DECL_POSSIBLY_INLINED (t)); hstate.add_flag (DECL_IS_NOVOPS (t)); hstate.add_flag (DECL_IS_RETURNS_TWICE (t)); hstate.add_flag (DECL_IS_MALLOC (t)); hstate.add_flag (DECL_DECLARED_INLINE_P (t)); hstate.add_flag (DECL_STATIC_CHAIN (t)); hstate.add_flag (DECL_NO_INLINE_WARNING_P (t)); hstate.add_flag (DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (t)); hstate.add_flag (DECL_NO_LIMIT_STACK (t)); hstate.add_flag (DECL_DISREGARD_INLINE_LIMITS (t)); hstate.add_flag (DECL_PURE_P (t)); hstate.add_flag (DECL_LOOPING_CONST_OR_PURE_P (t)); hstate.commit_flag (); if (DECL_BUILT_IN_CLASS (t) != NOT_BUILT_IN) hstate.add_int (DECL_UNCHECKED_FUNCTION_CODE (t)); } if (CODE_CONTAINS_STRUCT (code, TS_TYPE_COMMON)) { hstate.add_hwi (TYPE_MODE (t)); /* TYPE_NO_FORCE_BLK is private to stor-layout and need no streaming. */ hstate.add_flag (TYPE_PACKED (t)); hstate.add_flag (TYPE_RESTRICT (t)); hstate.add_flag (TYPE_USER_ALIGN (t)); hstate.add_flag (TYPE_READONLY (t)); if (RECORD_OR_UNION_TYPE_P (t)) { hstate.add_flag (TYPE_TRANSPARENT_AGGR (t)); hstate.add_flag (TYPE_FINAL_P (t)); hstate.add_flag (TYPE_CXX_ODR_P (t)); } else if (code == ARRAY_TYPE) hstate.add_flag (TYPE_NONALIASED_COMPONENT (t)); if (code == ARRAY_TYPE || code == INTEGER_TYPE) hstate.add_flag (TYPE_STRING_FLAG (t)); if (AGGREGATE_TYPE_P (t)) hstate.add_flag (TYPE_TYPELESS_STORAGE (t)); hstate.commit_flag (); hstate.add_int (TYPE_PRECISION (t)); hstate.add_int (TYPE_ALIGN (t)); hstate.add_int (TYPE_EMPTY_P (t)); } if (CODE_CONTAINS_STRUCT (code, TS_TRANSLATION_UNIT_DECL)) hstate.add (TRANSLATION_UNIT_LANGUAGE (t), strlen (TRANSLATION_UNIT_LANGUAGE (t))); if (CODE_CONTAINS_STRUCT (code, TS_TARGET_OPTION) /* We don't stream these when passing things to a different target. */ && !lto_stream_offload_p) hstate.add_hwi (cl_target_option_hash (TREE_TARGET_OPTION (t))); if (CODE_CONTAINS_STRUCT (code, TS_OPTIMIZATION)) hstate.add_hwi (cl_optimization_hash (TREE_OPTIMIZATION (t))); if (CODE_CONTAINS_STRUCT (code, TS_IDENTIFIER)) hstate.merge_hash (IDENTIFIER_HASH_VALUE (t)); if (CODE_CONTAINS_STRUCT (code, TS_STRING)) hstate.add (TREE_STRING_POINTER (t), TREE_STRING_LENGTH (t)); if (CODE_CONTAINS_STRUCT (code, TS_TYPED)) { if (code != IDENTIFIER_NODE) visit (TREE_TYPE (t)); } if (CODE_CONTAINS_STRUCT (code, TS_VECTOR)) { unsigned int count = vector_cst_encoded_nelts (t); for (unsigned int i = 0; i < count; ++i) visit (VECTOR_CST_ENCODED_ELT (t, i)); } if (CODE_CONTAINS_STRUCT (code, TS_POLY_INT_CST)) for (unsigned int i = 0; i < NUM_POLY_INT_COEFFS; ++i) visit (POLY_INT_CST_COEFF (t, i)); if (CODE_CONTAINS_STRUCT (code, TS_COMPLEX)) { visit (TREE_REALPART (t)); visit (TREE_IMAGPART (t)); } if (CODE_CONTAINS_STRUCT (code, TS_DECL_MINIMAL)) { /* Drop names that were created for anonymous entities. */ if (DECL_NAME (t) && TREE_CODE (DECL_NAME (t)) == IDENTIFIER_NODE && IDENTIFIER_ANON_P (DECL_NAME (t))) ; else visit (DECL_NAME (t)); if (DECL_FILE_SCOPE_P (t)) ; else visit (DECL_CONTEXT (t)); } if (CODE_CONTAINS_STRUCT (code, TS_DECL_COMMON)) { visit (DECL_SIZE (t)); visit (DECL_SIZE_UNIT (t)); visit (DECL_ATTRIBUTES (t)); if ((code == VAR_DECL || code == PARM_DECL) && DECL_HAS_VALUE_EXPR_P (t)) visit (DECL_VALUE_EXPR (t)); if (code == VAR_DECL && DECL_HAS_DEBUG_EXPR_P (t)) visit (DECL_DEBUG_EXPR (t)); /* ??? Hash DECL_INITIAL as streamed. Needs the output-block to be able to call get_symbol_initial_value. */ } if (CODE_CONTAINS_STRUCT (code, TS_DECL_WITH_VIS)) { if (DECL_ASSEMBLER_NAME_SET_P (t)) visit (DECL_ASSEMBLER_NAME (t)); } if (CODE_CONTAINS_STRUCT (code, TS_FIELD_DECL)) { visit (DECL_FIELD_OFFSET (t)); visit (DECL_BIT_FIELD_TYPE (t)); visit (DECL_BIT_FIELD_REPRESENTATIVE (t)); visit (DECL_FIELD_BIT_OFFSET (t)); } if (CODE_CONTAINS_STRUCT (code, TS_FUNCTION_DECL)) { visit (DECL_FUNCTION_PERSONALITY (t)); visit (DECL_FUNCTION_SPECIFIC_TARGET (t)); visit (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (t)); } if (CODE_CONTAINS_STRUCT (code, TS_TYPE_COMMON)) { visit (TYPE_SIZE (t)); visit (TYPE_SIZE_UNIT (t)); visit (TYPE_ATTRIBUTES (t)); visit (TYPE_NAME (t)); visit (TYPE_MAIN_VARIANT (t)); if (TYPE_FILE_SCOPE_P (t)) ; else visit (TYPE_CONTEXT (t)); } if (CODE_CONTAINS_STRUCT (code, TS_TYPE_NON_COMMON)) { if (code == ENUMERAL_TYPE) visit (TYPE_VALUES (t)); else if (code == ARRAY_TYPE) visit (TYPE_DOMAIN (t)); else if (RECORD_OR_UNION_TYPE_P (t)) for (tree f = TYPE_FIELDS (t); f; f = TREE_CHAIN (f)) visit (f); else if (code == FUNCTION_TYPE || code == METHOD_TYPE) visit (TYPE_ARG_TYPES (t)); if (!POINTER_TYPE_P (t)) visit (TYPE_MIN_VALUE_RAW (t)); visit (TYPE_MAX_VALUE_RAW (t)); } if (CODE_CONTAINS_STRUCT (code, TS_LIST)) { visit (TREE_PURPOSE (t)); visit (TREE_VALUE (t)); visit (TREE_CHAIN (t)); } if (CODE_CONTAINS_STRUCT (code, TS_VEC)) for (int i = 0; i < TREE_VEC_LENGTH (t); ++i) visit (TREE_VEC_ELT (t, i)); if (CODE_CONTAINS_STRUCT (code, TS_EXP)) { hstate.add_hwi (TREE_OPERAND_LENGTH (t)); for (int i = 0; i < TREE_OPERAND_LENGTH (t); ++i) visit (TREE_OPERAND (t, i)); } if (CODE_CONTAINS_STRUCT (code, TS_BINFO)) { unsigned i; tree b; FOR_EACH_VEC_ELT (*BINFO_BASE_BINFOS (t), i, b) visit (b); visit (BINFO_OFFSET (t)); visit (BINFO_VTABLE (t)); /* Do not walk BINFO_INHERITANCE_CHAIN, BINFO_SUBVTT_INDEX BINFO_BASE_ACCESSES and BINFO_VPTR_INDEX; these are used by C++ FE only. */ } if (CODE_CONTAINS_STRUCT (code, TS_CONSTRUCTOR)) { unsigned i; tree index, value; hstate.add_hwi (CONSTRUCTOR_NELTS (t)); FOR_EACH_CONSTRUCTOR_ELT (CONSTRUCTOR_ELTS (t), i, index, value) { visit (index); visit (value); } } if (code == OMP_CLAUSE) { int i; HOST_WIDE_INT val; hstate.add_hwi (OMP_CLAUSE_CODE (t)); switch (OMP_CLAUSE_CODE (t)) { case OMP_CLAUSE_DEFAULT: val = OMP_CLAUSE_DEFAULT_KIND (t); break; case OMP_CLAUSE_SCHEDULE: val = OMP_CLAUSE_SCHEDULE_KIND (t); break; case OMP_CLAUSE_DEPEND: val = OMP_CLAUSE_DEPEND_KIND (t); break; case OMP_CLAUSE_MAP: val = OMP_CLAUSE_MAP_KIND (t); break; case OMP_CLAUSE_PROC_BIND: val = OMP_CLAUSE_PROC_BIND_KIND (t); break; case OMP_CLAUSE_REDUCTION: case OMP_CLAUSE_TASK_REDUCTION: case OMP_CLAUSE_IN_REDUCTION: val = OMP_CLAUSE_REDUCTION_CODE (t); break; default: val = 0; break; } hstate.add_hwi (val); for (i = 0; i < omp_clause_num_ops[OMP_CLAUSE_CODE (t)]; i++) visit (OMP_CLAUSE_OPERAND (t, i)); visit (OMP_CLAUSE_CHAIN (t)); } return hstate.end (); #undef visit } /* Compare two SCC entries by their hash value for qsorting them. */ int DFS::scc_entry_compare (const void *p1_, const void *p2_) { const scc_entry *p1 = (const scc_entry *) p1_; const scc_entry *p2 = (const scc_entry *) p2_; if (p1->hash < p2->hash) return -1; else if (p1->hash > p2->hash) return 1; return 0; } /* Return a hash value for the SCC on the SCC stack from FIRST with SIZE. THIS_REF_P and REF_P are as passed to lto_output_tree for FIRST. */ hashval_t DFS::hash_scc (struct output_block *ob, unsigned first, unsigned size, bool ref_p, bool this_ref_p) { unsigned int last_classes = 0, iterations = 0; /* Compute hash values for the SCC members. */ for (unsigned i = 0; i < size; ++i) sccstack[first+i].hash = hash_tree (ob->writer_cache, NULL, sccstack[first+i].t); if (size == 1) return sccstack[first].hash; /* We aim to get unique hash for every tree within SCC and compute hash value of the whole SCC by combining all values together in a stable (entry-point independent) order. This guarantees that the same SCC regions within different translation units will get the same hash values and therefore will be merged at WPA time. Often the hashes are already unique. In that case we compute the SCC hash by combining individual hash values in an increasing order. If there are duplicates, we seek at least one tree with unique hash (and pick one with minimal hash and this property). Then we obtain a stable order by DFS walk starting from this unique tree and then use the index within this order to make individual hash values unique. If there is no tree with unique hash, we iteratively propagate the hash values across the internal edges of SCC. This usually quickly leads to unique hashes. Consider, for example, an SCC containing two pointers that are identical except for the types they point to and assume that these types are also part of the SCC. The propagation will add the points-to type information into their hash values. */ do { /* Sort the SCC so we can easily check for uniqueness. */ qsort (&sccstack[first], size, sizeof (scc_entry), scc_entry_compare); unsigned int classes = 1; int firstunique = -1; /* Find the tree with lowest unique hash (if it exists) and compute the number of equivalence classes. */ if (sccstack[first].hash != sccstack[first+1].hash) firstunique = 0; for (unsigned i = 1; i < size; ++i) if (sccstack[first+i-1].hash != sccstack[first+i].hash) { classes++; if (firstunique == -1 && (i == size - 1 || sccstack[first+i+1].hash != sccstack[first+i].hash)) firstunique = i; } /* If we found a tree with unique hash, stop the iteration. */ if (firstunique != -1 /* Also terminate if we run out of iterations or if the number of equivalence classes is no longer increasing. For example a cyclic list of trees that are all equivalent will never have unique entry point; we however do not build such SCCs in our IL. */ || classes <= last_classes || iterations > 16) { hashval_t scc_hash; /* If some hashes are not unique (CLASSES != SIZE), use the DFS walk starting from FIRSTUNIQUE to obtain a stable order. */ if (classes != size && firstunique != -1) { hash_map map(size*2); /* Store hash values into a map, so we can associate them with the reordered SCC. */ for (unsigned i = 0; i < size; ++i) map.put (sccstack[first+i].t, sccstack[first+i].hash); DFS again (ob, sccstack[first+firstunique].t, ref_p, this_ref_p, true); gcc_assert (again.sccstack.length () == size); memcpy (sccstack.address () + first, again.sccstack.address (), sizeof (scc_entry) * size); /* Update hash values of individual members by hashing in the index within the stable order. This ensures uniqueness. Also compute the SCC hash by mixing in all hash values in the stable order we obtained. */ sccstack[first].hash = *map.get (sccstack[first].t); scc_hash = sccstack[first].hash; for (unsigned i = 1; i < size; ++i) { sccstack[first+i].hash = iterative_hash_hashval_t (i, *map.get (sccstack[first+i].t)); scc_hash = iterative_hash_hashval_t (scc_hash, sccstack[first+i].hash); } } /* If we got a unique hash value for each tree, then sort already ensured entry-point independent order. Only compute the final SCC hash. If we failed to find the unique entry point, we go by the same route. We will eventually introduce unwanted hash conflicts. */ else { scc_hash = sccstack[first].hash; for (unsigned i = 1; i < size; ++i) scc_hash = iterative_hash_hashval_t (scc_hash, sccstack[first+i].hash); /* We cannot 100% guarantee that the hash won't conflict so as to make it impossible to find a unique hash. This however should be an extremely rare case. ICE for now so possible issues are found and evaluated. */ gcc_checking_assert (classes == size); } /* To avoid conflicts across SCCs, iteratively hash the whole SCC hash into the hash of each element. */ for (unsigned i = 0; i < size; ++i) sccstack[first+i].hash = iterative_hash_hashval_t (sccstack[first+i].hash, scc_hash); return scc_hash; } last_classes = classes; iterations++; /* We failed to identify the entry point; propagate hash values across the edges. */ hash_map map(size*2); for (unsigned i = 0; i < size; ++i) map.put (sccstack[first+i].t, sccstack[first+i].hash); for (unsigned i = 0; i < size; i++) sccstack[first+i].hash = hash_tree (ob->writer_cache, &map, sccstack[first+i].t); } while (true); } /* DFS walk EXPR and stream SCCs of tree bodies if they are not already in the streamer cache. Main routine called for each visit of EXPR. */ void DFS::DFS_write_tree (struct output_block *ob, sccs *from_state, tree expr, bool ref_p, bool this_ref_p) { /* Handle special cases. */ if (expr == NULL_TREE) return; /* Do not DFS walk into indexable trees. */ if (this_ref_p && tree_is_indexable (expr)) return; /* Check if we already streamed EXPR. */ if (streamer_tree_cache_lookup (ob->writer_cache, expr, NULL)) return; worklist w; w.expr = expr; w.from_state = from_state; w.cstate = NULL; w.ref_p = ref_p; w.this_ref_p = this_ref_p; worklist_vec.safe_push (w); } /* Emit the physical representation of tree node EXPR to output block OB. If THIS_REF_P is true, the leaves of EXPR are emitted as references via lto_output_tree_ref. REF_P is used for streaming siblings of EXPR. */ void lto_output_tree (struct output_block *ob, tree expr, bool ref_p, bool this_ref_p) { unsigned ix; bool existed_p; if (expr == NULL_TREE) { streamer_write_record_start (ob, LTO_null); return; } if (this_ref_p && tree_is_indexable (expr)) { lto_output_tree_ref (ob, expr); return; } existed_p = streamer_tree_cache_lookup (ob->writer_cache, expr, &ix); if (existed_p) { /* If a node has already been streamed out, make sure that we don't write it more than once. Otherwise, the reader will instantiate two different nodes for the same object. */ streamer_write_record_start (ob, LTO_tree_pickle_reference); streamer_write_uhwi (ob, ix); streamer_write_enum (ob->main_stream, LTO_tags, LTO_NUM_TAGS, lto_tree_code_to_tag (TREE_CODE (expr))); lto_stats.num_pickle_refs_output++; } else { /* This is the first time we see EXPR, write all reachable trees to OB. */ static bool in_dfs_walk; /* Protect against recursion which means disconnect between what tree edges we walk in the DFS walk and what edges we stream out. */ gcc_assert (!in_dfs_walk); if (streamer_dump_file) { print_node_brief (streamer_dump_file, " Streaming SCC of ", expr, 4); fprintf (streamer_dump_file, "\n"); } /* Start the DFS walk. */ /* Save ob state ... */ /* let's see ... */ in_dfs_walk = true; DFS (ob, expr, ref_p, this_ref_p, false); in_dfs_walk = false; /* Finally append a reference to the tree we were writing. ??? If expr ended up as a singleton we could have inlined it here and avoid outputting a reference. */ existed_p = streamer_tree_cache_lookup (ob->writer_cache, expr, &ix); gcc_assert (existed_p); streamer_write_record_start (ob, LTO_tree_pickle_reference); streamer_write_uhwi (ob, ix); streamer_write_enum (ob->main_stream, LTO_tags, LTO_NUM_TAGS, lto_tree_code_to_tag (TREE_CODE (expr))); if (streamer_dump_file) { print_node_brief (streamer_dump_file, " Finished SCC of ", expr, 4); fprintf (streamer_dump_file, "\n\n"); } lto_stats.num_pickle_refs_output++; } } /* Output to OB a list of try/catch handlers starting with FIRST. */ static void output_eh_try_list (struct output_block *ob, eh_catch first) { eh_catch n; for (n = first; n; n = n->next_catch) { streamer_write_record_start (ob, LTO_eh_catch); stream_write_tree (ob, n->type_list, true); stream_write_tree (ob, n->filter_list, true); stream_write_tree (ob, n->label, true); } streamer_write_record_start (ob, LTO_null); } /* Output EH region R in function FN to OB. CURR_RN is the slot index that is being emitted in FN->EH->REGION_ARRAY. This is used to detect EH region sharing. */ static void output_eh_region (struct output_block *ob, eh_region r) { enum LTO_tags tag; if (r == NULL) { streamer_write_record_start (ob, LTO_null); return; } if (r->type == ERT_CLEANUP) tag = LTO_ert_cleanup; else if (r->type == ERT_TRY) tag = LTO_ert_try; else if (r->type == ERT_ALLOWED_EXCEPTIONS) tag = LTO_ert_allowed_exceptions; else if (r->type == ERT_MUST_NOT_THROW) tag = LTO_ert_must_not_throw; else gcc_unreachable (); streamer_write_record_start (ob, tag); streamer_write_hwi (ob, r->index); if (r->outer) streamer_write_hwi (ob, r->outer->index); else streamer_write_zero (ob); if (r->inner) streamer_write_hwi (ob, r->inner->index); else streamer_write_zero (ob); if (r->next_peer) streamer_write_hwi (ob, r->next_peer->index); else streamer_write_zero (ob); if (r->type == ERT_TRY) { output_eh_try_list (ob, r->u.eh_try.first_catch); } else if (r->type == ERT_ALLOWED_EXCEPTIONS) { stream_write_tree (ob, r->u.allowed.type_list, true); stream_write_tree (ob, r->u.allowed.label, true); streamer_write_uhwi (ob, r->u.allowed.filter); } else if (r->type == ERT_MUST_NOT_THROW) { stream_write_tree (ob, r->u.must_not_throw.failure_decl, true); bitpack_d bp = bitpack_create (ob->main_stream); stream_output_location (ob, &bp, r->u.must_not_throw.failure_loc); streamer_write_bitpack (&bp); } if (r->landing_pads) streamer_write_hwi (ob, r->landing_pads->index); else streamer_write_zero (ob); } /* Output landing pad LP to OB. */ static void output_eh_lp (struct output_block *ob, eh_landing_pad lp) { if (lp == NULL) { streamer_write_record_start (ob, LTO_null); return; } streamer_write_record_start (ob, LTO_eh_landing_pad); streamer_write_hwi (ob, lp->index); if (lp->next_lp) streamer_write_hwi (ob, lp->next_lp->index); else streamer_write_zero (ob); if (lp->region) streamer_write_hwi (ob, lp->region->index); else streamer_write_zero (ob); stream_write_tree (ob, lp->post_landing_pad, true); } /* Output the existing eh_table to OB. */ static void output_eh_regions (struct output_block *ob, struct function *fn) { if (fn->eh && fn->eh->region_tree) { unsigned i; eh_region eh; eh_landing_pad lp; tree ttype; streamer_write_record_start (ob, LTO_eh_table); /* Emit the index of the root of the EH region tree. */ streamer_write_hwi (ob, fn->eh->region_tree->index); /* Emit all the EH regions in the region array. */ streamer_write_hwi (ob, vec_safe_length (fn->eh->region_array)); FOR_EACH_VEC_SAFE_ELT (fn->eh->region_array, i, eh) output_eh_region (ob, eh); /* Emit all landing pads. */ streamer_write_hwi (ob, vec_safe_length (fn->eh->lp_array)); FOR_EACH_VEC_SAFE_ELT (fn->eh->lp_array, i, lp) output_eh_lp (ob, lp); /* Emit all the runtime type data. */ streamer_write_hwi (ob, vec_safe_length (fn->eh->ttype_data)); FOR_EACH_VEC_SAFE_ELT (fn->eh->ttype_data, i, ttype) stream_write_tree (ob, ttype, true); /* Emit the table of action chains. */ if (targetm.arm_eabi_unwinder) { tree t; streamer_write_hwi (ob, vec_safe_length (fn->eh->ehspec_data.arm_eabi)); FOR_EACH_VEC_SAFE_ELT (fn->eh->ehspec_data.arm_eabi, i, t) stream_write_tree (ob, t, true); } else { uchar c; streamer_write_hwi (ob, vec_safe_length (fn->eh->ehspec_data.other)); FOR_EACH_VEC_SAFE_ELT (fn->eh->ehspec_data.other, i, c) streamer_write_char_stream (ob->main_stream, c); } } /* The LTO_null either terminates the record or indicates that there are no eh_records at all. */ streamer_write_record_start (ob, LTO_null); } /* Output all of the active ssa names to the ssa_names stream. */ static void output_ssa_names (struct output_block *ob, struct function *fn) { unsigned int i, len; len = vec_safe_length (SSANAMES (fn)); streamer_write_uhwi (ob, len); for (i = 1; i < len; i++) { tree ptr = (*SSANAMES (fn))[i]; if (ptr == NULL_TREE || SSA_NAME_IN_FREE_LIST (ptr) || virtual_operand_p (ptr) /* Simply skip unreleased SSA names. */ || (! SSA_NAME_IS_DEFAULT_DEF (ptr) && (! SSA_NAME_DEF_STMT (ptr) || ! gimple_bb (SSA_NAME_DEF_STMT (ptr))))) continue; streamer_write_uhwi (ob, i); streamer_write_char_stream (ob->main_stream, SSA_NAME_IS_DEFAULT_DEF (ptr)); if (SSA_NAME_VAR (ptr)) stream_write_tree (ob, SSA_NAME_VAR (ptr), true); else /* ??? This drops SSA_NAME_IDENTIFIER on the floor. */ stream_write_tree (ob, TREE_TYPE (ptr), true); } streamer_write_zero (ob); } /* Output the cfg. */ static void output_cfg (struct output_block *ob, struct function *fn) { struct lto_output_stream *tmp_stream = ob->main_stream; basic_block bb; ob->main_stream = ob->cfg_stream; streamer_write_enum (ob->main_stream, profile_status_d, PROFILE_LAST, profile_status_for_fn (fn)); /* Output the number of the highest basic block. */ streamer_write_uhwi (ob, last_basic_block_for_fn (fn)); FOR_ALL_BB_FN (bb, fn) { edge_iterator ei; edge e; streamer_write_hwi (ob, bb->index); /* Output the successors and the edge flags. */ streamer_write_uhwi (ob, EDGE_COUNT (bb->succs)); FOR_EACH_EDGE (e, ei, bb->succs) { streamer_write_uhwi (ob, e->dest->index); e->probability.stream_out (ob); streamer_write_uhwi (ob, e->flags); } } streamer_write_hwi (ob, -1); bb = ENTRY_BLOCK_PTR_FOR_FN (fn); while (bb->next_bb) { streamer_write_hwi (ob, bb->next_bb->index); bb = bb->next_bb; } streamer_write_hwi (ob, -1); /* Output the number of loops. */ streamer_write_uhwi (ob, number_of_loops (fn)); /* Output each loop, skipping the tree root which has number zero. */ for (unsigned i = 1; i < number_of_loops (fn); ++i) { class loop *loop = get_loop (fn, i); /* Write the index of the loop header. That's enough to rebuild the loop tree on the reader side. Stream -1 for an unused loop entry. */ if (!loop) { streamer_write_hwi (ob, -1); continue; } else streamer_write_hwi (ob, loop->header->index); /* Write everything copy_loop_info copies. */ streamer_write_enum (ob->main_stream, loop_estimation, EST_LAST, loop->estimate_state); streamer_write_hwi (ob, loop->any_upper_bound); if (loop->any_upper_bound) streamer_write_widest_int (ob, loop->nb_iterations_upper_bound); streamer_write_hwi (ob, loop->any_likely_upper_bound); if (loop->any_likely_upper_bound) streamer_write_widest_int (ob, loop->nb_iterations_likely_upper_bound); streamer_write_hwi (ob, loop->any_estimate); if (loop->any_estimate) streamer_write_widest_int (ob, loop->nb_iterations_estimate); /* Write OMP SIMD related info. */ streamer_write_hwi (ob, loop->safelen); streamer_write_hwi (ob, loop->unroll); streamer_write_hwi (ob, loop->owned_clique); streamer_write_hwi (ob, loop->dont_vectorize); streamer_write_hwi (ob, loop->force_vectorize); streamer_write_hwi (ob, loop->finite_p); stream_write_tree (ob, loop->simduid, true); } ob->main_stream = tmp_stream; } /* Create the header in the file using OB. If the section type is for a function, set FN to the decl for that function. */ void produce_asm (struct output_block *ob, tree fn) { enum lto_section_type section_type = ob->section_type; struct lto_function_header header; char *section_name; if (section_type == LTO_section_function_body) { const char *name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fn)); section_name = lto_get_section_name (section_type, name, symtab_node::get (fn)->order, NULL); } else section_name = lto_get_section_name (section_type, NULL, 0, NULL); lto_begin_section (section_name, !flag_wpa); free (section_name); /* The entire header is stream computed here. */ memset (&header, 0, sizeof (struct lto_function_header)); if (section_type == LTO_section_function_body) header.cfg_size = ob->cfg_stream->total_size; header.main_size = ob->main_stream->total_size; header.string_size = ob->string_stream->total_size; lto_write_data (&header, sizeof header); /* Put all of the gimple and the string table out the asm file as a block of text. */ if (section_type == LTO_section_function_body) lto_write_stream (ob->cfg_stream); lto_write_stream (ob->main_stream); lto_write_stream (ob->string_stream); lto_end_section (); } /* Output the base body of struct function FN using output block OB. */ static void output_struct_function_base (struct output_block *ob, struct function *fn) { struct bitpack_d bp; unsigned i; tree t; /* Output the static chain and non-local goto save area. */ stream_write_tree (ob, fn->static_chain_decl, true); stream_write_tree (ob, fn->nonlocal_goto_save_area, true); /* Output all the local variables in the function. */ streamer_write_hwi (ob, vec_safe_length (fn->local_decls)); FOR_EACH_VEC_SAFE_ELT (fn->local_decls, i, t) stream_write_tree (ob, t, true); /* Output current IL state of the function. */ streamer_write_uhwi (ob, fn->curr_properties); /* Write all the attributes for FN. */ bp = bitpack_create (ob->main_stream); bp_pack_value (&bp, fn->is_thunk, 1); bp_pack_value (&bp, fn->has_local_explicit_reg_vars, 1); bp_pack_value (&bp, fn->returns_pcc_struct, 1); bp_pack_value (&bp, fn->returns_struct, 1); bp_pack_value (&bp, fn->can_throw_non_call_exceptions, 1); bp_pack_value (&bp, fn->can_delete_dead_exceptions, 1); bp_pack_value (&bp, fn->always_inline_functions_inlined, 1); bp_pack_value (&bp, fn->after_inlining, 1); bp_pack_value (&bp, fn->stdarg, 1); bp_pack_value (&bp, fn->has_nonlocal_label, 1); bp_pack_value (&bp, fn->has_forced_label_in_static, 1); bp_pack_value (&bp, fn->calls_alloca, 1); bp_pack_value (&bp, fn->calls_setjmp, 1); bp_pack_value (&bp, fn->calls_eh_return, 1); bp_pack_value (&bp, fn->has_force_vectorize_loops, 1); bp_pack_value (&bp, fn->has_simduid_loops, 1); bp_pack_value (&bp, fn->va_list_fpr_size, 8); bp_pack_value (&bp, fn->va_list_gpr_size, 8); bp_pack_value (&bp, fn->last_clique, sizeof (short) * 8); /* Output the function start and end loci. */ stream_output_location (ob, &bp, fn->function_start_locus); stream_output_location (ob, &bp, fn->function_end_locus); /* Save the instance discriminator if present. */ int *instance_number_p = NULL; if (decl_to_instance_map) instance_number_p = decl_to_instance_map->get (fn->decl); bp_pack_value (&bp, !!instance_number_p, 1); if (instance_number_p) bp_pack_value (&bp, *instance_number_p, sizeof (int) * CHAR_BIT); streamer_write_bitpack (&bp); } /* Collect all leaf BLOCKs beyond ROOT into LEAFS. */ static void collect_block_tree_leafs (tree root, vec &leafs) { for (root = BLOCK_SUBBLOCKS (root); root; root = BLOCK_CHAIN (root)) if (! BLOCK_SUBBLOCKS (root)) leafs.safe_push (root); else collect_block_tree_leafs (BLOCK_SUBBLOCKS (root), leafs); } /* This performs function body modifications that are needed for streaming to work. */ void lto_prepare_function_for_streaming (struct cgraph_node *node) { struct function *fn = DECL_STRUCT_FUNCTION (node->decl); basic_block bb; if (number_of_loops (fn)) { push_cfun (fn); loop_optimizer_init (AVOID_CFG_MODIFICATIONS); loop_optimizer_finalize (); pop_cfun (); } /* We will renumber the statements. The code that does this uses the same ordering that we use for serializing them so we can use the same code on the other end and not have to write out the statement numbers. We do not assign UIDs to PHIs here because virtual PHIs get re-computed on-the-fly which would make numbers inconsistent. */ set_gimple_stmt_max_uid (fn, 0); FOR_ALL_BB_FN (bb, fn) { for (gphi_iterator gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi)) { gphi *stmt = gsi.phi (); /* Virtual PHIs are not going to be streamed. */ if (!virtual_operand_p (gimple_phi_result (stmt))) gimple_set_uid (stmt, inc_gimple_stmt_max_uid (fn)); } for (gimple_stmt_iterator gsi = gsi_start_bb (bb); !gsi_end_p (gsi); gsi_next (&gsi)) { gimple *stmt = gsi_stmt (gsi); gimple_set_uid (stmt, inc_gimple_stmt_max_uid (fn)); } } /* To avoid keeping duplicate gimple IDs in the statements, renumber virtual phis now. */ FOR_ALL_BB_FN (bb, fn) { for (gphi_iterator gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi)) { gphi *stmt = gsi.phi (); if (virtual_operand_p (gimple_phi_result (stmt))) gimple_set_uid (stmt, inc_gimple_stmt_max_uid (fn)); } } } /* Output the body of function NODE->DECL. */ static void output_function (struct cgraph_node *node) { tree function; struct function *fn; basic_block bb; struct output_block *ob; if (streamer_dump_file) fprintf (streamer_dump_file, "\nStreaming body of %s\n", node->dump_name ()); function = node->decl; fn = DECL_STRUCT_FUNCTION (function); ob = create_output_block (LTO_section_function_body); clear_line_info (ob); ob->symbol = node; gcc_assert (current_function_decl == NULL_TREE && cfun == NULL); /* Make string 0 be a NULL string. */ streamer_write_char_stream (ob->string_stream, 0); streamer_write_record_start (ob, LTO_function); /* Output decls for parameters and args. */ stream_write_tree (ob, DECL_RESULT (function), true); streamer_write_chain (ob, DECL_ARGUMENTS (function), true); /* Output debug args if available. */ vec **debugargs = decl_debug_args_lookup (function); if (! debugargs) streamer_write_uhwi (ob, 0); else { streamer_write_uhwi (ob, (*debugargs)->length ()); for (unsigned i = 0; i < (*debugargs)->length (); ++i) stream_write_tree (ob, (**debugargs)[i], true); } /* Output DECL_INITIAL for the function, which contains the tree of lexical scopes. */ stream_write_tree (ob, DECL_INITIAL (function), true); /* As we do not recurse into BLOCK_SUBBLOCKS but only BLOCK_SUPERCONTEXT collect block tree leafs and stream those. */ auto_vec block_tree_leafs; if (DECL_INITIAL (function)) collect_block_tree_leafs (DECL_INITIAL (function), block_tree_leafs); streamer_write_uhwi (ob, block_tree_leafs.length ()); for (unsigned i = 0; i < block_tree_leafs.length (); ++i) stream_write_tree (ob, block_tree_leafs[i], true); /* We also stream abstract functions where we stream only stuff needed for debug info. */ if (gimple_has_body_p (function)) { streamer_write_uhwi (ob, 1); output_struct_function_base (ob, fn); /* Output all the SSA names used in the function. */ output_ssa_names (ob, fn); /* Output any exception handling regions. */ output_eh_regions (ob, fn); /* Output the code for the function. */ FOR_ALL_BB_FN (bb, fn) output_bb (ob, bb, fn); /* The terminator for this function. */ streamer_write_record_start (ob, LTO_null); output_cfg (ob, fn); } else streamer_write_uhwi (ob, 0); /* Create a section to hold the pickled output of this function. */ produce_asm (ob, function); destroy_output_block (ob); if (streamer_dump_file) fprintf (streamer_dump_file, "Finished streaming %s\n", node->dump_name ()); } /* Output the body of function NODE->DECL. */ static void output_constructor (struct varpool_node *node) { tree var = node->decl; struct output_block *ob; if (streamer_dump_file) fprintf (streamer_dump_file, "\nStreaming constructor of %s\n", node->dump_name ()); timevar_push (TV_IPA_LTO_CTORS_OUT); ob = create_output_block (LTO_section_function_body); clear_line_info (ob); ob->symbol = node; /* Make string 0 be a NULL string. */ streamer_write_char_stream (ob->string_stream, 0); /* Output DECL_INITIAL for the function, which contains the tree of lexical scopes. */ stream_write_tree (ob, DECL_INITIAL (var), true); /* Create a section to hold the pickled output of this function. */ produce_asm (ob, var); destroy_output_block (ob); if (streamer_dump_file) fprintf (streamer_dump_file, "Finished streaming %s\n", node->dump_name ()); timevar_pop (TV_IPA_LTO_CTORS_OUT); } /* Emit toplevel asms. */ void lto_output_toplevel_asms (void) { struct output_block *ob; struct asm_node *can; char *section_name; struct lto_simple_header_with_strings header; if (!symtab->first_asm_symbol ()) return; ob = create_output_block (LTO_section_asm); /* Make string 0 be a NULL string. */ streamer_write_char_stream (ob->string_stream, 0); for (can = symtab->first_asm_symbol (); can; can = can->next) { streamer_write_string_cst (ob, ob->main_stream, can->asm_str); streamer_write_hwi (ob, can->order); } streamer_write_string_cst (ob, ob->main_stream, NULL_TREE); section_name = lto_get_section_name (LTO_section_asm, NULL, 0, NULL); lto_begin_section (section_name, !flag_wpa); free (section_name); /* The entire header stream is computed here. */ memset (&header, 0, sizeof (header)); header.main_size = ob->main_stream->total_size; header.string_size = ob->string_stream->total_size; lto_write_data (&header, sizeof header); /* Put all of the gimple and the string table out the asm file as a block of text. */ lto_write_stream (ob->main_stream); lto_write_stream (ob->string_stream); lto_end_section (); destroy_output_block (ob); } /* Copy the function body or variable constructor of NODE without deserializing. */ static void copy_function_or_variable (struct symtab_node *node) { tree function = node->decl; struct lto_file_decl_data *file_data = node->lto_file_data; const char *data; size_t len; const char *name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (function)); char *section_name = lto_get_section_name (LTO_section_function_body, name, node->order, NULL); size_t i, j; struct lto_in_decl_state *in_state; struct lto_out_decl_state *out_state = lto_get_out_decl_state (); if (streamer_dump_file) fprintf (streamer_dump_file, "Copying section for %s\n", name); lto_begin_section (section_name, false); free (section_name); /* We may have renamed the declaration, e.g., a static function. */ name = lto_get_decl_name_mapping (file_data, name); data = lto_get_raw_section_data (file_data, LTO_section_function_body, name, node->order - file_data->order_base, &len); gcc_assert (data); /* Do a bit copy of the function body. */ lto_write_raw_data (data, len); /* Copy decls. */ in_state = lto_get_function_in_decl_state (node->lto_file_data, function); out_state->compressed = in_state->compressed; gcc_assert (in_state); for (i = 0; i < LTO_N_DECL_STREAMS; i++) { size_t n = vec_safe_length (in_state->streams[i]); vec *trees = in_state->streams[i]; struct lto_tree_ref_encoder *encoder = &(out_state->streams[i]); /* The out state must have the same indices and the in state. So just copy the vector. All the encoders in the in state must be empty where we reach here. */ gcc_assert (lto_tree_ref_encoder_size (encoder) == 0); encoder->trees.reserve_exact (n); for (j = 0; j < n; j++) encoder->trees.safe_push ((*trees)[j]); } lto_free_raw_section_data (file_data, LTO_section_function_body, name, data, len); lto_end_section (); } /* Wrap symbol references in *TP inside a type-preserving MEM_REF. */ static tree wrap_refs (tree *tp, int *ws, void *) { tree t = *tp; if (handled_component_p (t) && TREE_CODE (TREE_OPERAND (t, 0)) == VAR_DECL && TREE_PUBLIC (TREE_OPERAND (t, 0))) { tree decl = TREE_OPERAND (t, 0); tree ptrtype = build_pointer_type (TREE_TYPE (decl)); TREE_OPERAND (t, 0) = build2 (MEM_REF, TREE_TYPE (decl), build1 (ADDR_EXPR, ptrtype, decl), build_int_cst (ptrtype, 0)); TREE_THIS_VOLATILE (TREE_OPERAND (t, 0)) = TREE_THIS_VOLATILE (decl); *ws = 0; } else if (TREE_CODE (t) == CONSTRUCTOR) ; else if (!EXPR_P (t)) *ws = 0; return NULL_TREE; } /* Remove functions that are no longer used from offload_funcs, and mark the remaining ones with DECL_PRESERVE_P. */ static void prune_offload_funcs (void) { if (!offload_funcs) return; unsigned ix, ix2; tree *elem_ptr; VEC_ORDERED_REMOVE_IF (*offload_funcs, ix, ix2, elem_ptr, cgraph_node::get (*elem_ptr) == NULL); tree fn_decl; FOR_EACH_VEC_ELT (*offload_funcs, ix, fn_decl) DECL_PRESERVE_P (fn_decl) = 1; } /* Produce LTO section that contains global information about LTO bytecode. */ static void produce_lto_section () { /* Stream LTO meta section. */ output_block *ob = create_output_block (LTO_section_lto); char * section_name = lto_get_section_name (LTO_section_lto, NULL, 0, NULL); lto_begin_section (section_name, false); free (section_name); #ifdef HAVE_ZSTD_H lto_compression compression = ZSTD; #else lto_compression compression = ZLIB; #endif bool slim_object = flag_generate_lto && !flag_fat_lto_objects; lto_section s = { LTO_major_version, LTO_minor_version, slim_object, 0 }; s.set_compression (compression); lto_write_data (&s, sizeof s); lto_end_section (); destroy_output_block (ob); } /* Compare symbols to get them sorted by filename (to optimize streaming) */ static int cmp_symbol_files (const void *pn1, const void *pn2, void *id_map_) { const symtab_node *n1 = *(const symtab_node * const *)pn1; const symtab_node *n2 = *(const symtab_node * const *)pn2; hash_map *id_map = (hash_map *)id_map_; int file_order1 = n1->lto_file_data ? n1->lto_file_data->order : -1; int file_order2 = n2->lto_file_data ? n2->lto_file_data->order : -1; /* Order files same way as they appeared in the command line to reduce seeking while copying sections. */ if (file_order1 != file_order2) return file_order1 - file_order2; /* Order within static library. */ if (n1->lto_file_data && n1->lto_file_data->id != n2->lto_file_data->id) return *id_map->get (n1->lto_file_data) - *id_map->get (n2->lto_file_data); /* And finaly order by the definition order. */ return n1->order - n2->order; } /* Main entry point from the pass manager. */ void lto_output (void) { struct lto_out_decl_state *decl_state; bitmap output = NULL; bitmap_obstack output_obstack; unsigned int i, n_nodes; lto_symtab_encoder_t encoder = lto_get_out_decl_state ()->symtab_node_encoder; auto_vec symbols_to_copy; prune_offload_funcs (); if (flag_checking) { bitmap_obstack_initialize (&output_obstack); output = BITMAP_ALLOC (&output_obstack); } /* Initialize the streamer. */ lto_streamer_init (); produce_lto_section (); n_nodes = lto_symtab_encoder_size (encoder); /* Prepare vector of functions to output and then sort it to optimize section copying. */ for (i = 0; i < n_nodes; i++) { symtab_node *snode = lto_symtab_encoder_deref (encoder, i); if (snode->alias) continue; if (cgraph_node *node = dyn_cast (snode)) { if (lto_symtab_encoder_encode_body_p (encoder, node)) symbols_to_copy.safe_push (node); } else if (varpool_node *node = dyn_cast (snode)) { /* Wrap symbol references inside the ctor in a type preserving MEM_REF. */ tree ctor = DECL_INITIAL (node->decl); if (ctor && !in_lto_p) walk_tree (&ctor, wrap_refs, NULL, NULL); if (get_symbol_initial_value (encoder, node->decl) == error_mark_node && lto_symtab_encoder_encode_initializer_p (encoder, node)) symbols_to_copy.safe_push (node); } } /* Map the section hash to an order it appears in symbols_to_copy since we want to sort same ID symbols next to each other but need to avoid making overall order depend on the actual hash value. */ int order = 0; hash_map id_map; for (i = 0; i < symbols_to_copy.length (); ++i) { symtab_node *snode = symbols_to_copy[i]; if (snode->lto_file_data) { bool existed_p = false; int &ord = id_map.get_or_insert (snode->lto_file_data, &existed_p); if (!existed_p) ord = order++; } } symbols_to_copy.sort (cmp_symbol_files, (void *)&id_map); for (i = 0; i < symbols_to_copy.length (); i++) { symtab_node *snode = symbols_to_copy[i]; cgraph_node *cnode; varpool_node *vnode; if (flag_checking) gcc_assert (bitmap_set_bit (output, DECL_UID (snode->decl))); decl_state = lto_new_out_decl_state (); lto_push_out_decl_state (decl_state); if ((cnode = dyn_cast (snode)) && (gimple_has_body_p (cnode->decl) || (!flag_wpa && flag_incremental_link != INCREMENTAL_LINK_LTO) /* Thunks have no body but they may be synthetized at WPA time. */ || DECL_ARGUMENTS (cnode->decl))) output_function (cnode); else if ((vnode = dyn_cast (snode)) && (DECL_INITIAL (vnode->decl) != error_mark_node || (!flag_wpa && flag_incremental_link != INCREMENTAL_LINK_LTO))) output_constructor (vnode); else copy_function_or_variable (snode); gcc_assert (lto_get_out_decl_state () == decl_state); lto_pop_out_decl_state (); lto_record_function_out_decl_state (snode->decl, decl_state); } /* Emit the callgraph after emitting function bodies. This needs to be done now to make sure that all the statements in every function have been renumbered so that edges can be associated with call statements using the statement UIDs. */ output_symtab (); output_offload_tables (); if (flag_checking) { BITMAP_FREE (output); bitmap_obstack_release (&output_obstack); } } /* Write each node in encoded by ENCODER to OB, as well as those reachable from it and required for correct representation of its semantics. Each node in ENCODER must be a global declaration or a type. A node is written only once, even if it appears multiple times in the vector. Certain transitively-reachable nodes, such as those representing expressions, may be duplicated, but such nodes must not appear in ENCODER itself. */ static void write_global_stream (struct output_block *ob, struct lto_tree_ref_encoder *encoder) { tree t; size_t index; const size_t size = lto_tree_ref_encoder_size (encoder); for (index = 0; index < size; index++) { t = lto_tree_ref_encoder_get_tree (encoder, index); if (streamer_dump_file) { fprintf (streamer_dump_file, " %i:", (int)index); print_node_brief (streamer_dump_file, "", t, 4); fprintf (streamer_dump_file, "\n"); } if (!streamer_tree_cache_lookup (ob->writer_cache, t, NULL)) stream_write_tree (ob, t, false); } } /* Write a sequence of indices into the globals vector corresponding to the trees in ENCODER. These are used by the reader to map the indices used to refer to global entities within function bodies to their referents. */ static void write_global_references (struct output_block *ob, struct lto_tree_ref_encoder *encoder) { tree t; uint32_t index; const uint32_t size = lto_tree_ref_encoder_size (encoder); /* Write size and slot indexes as 32-bit unsigned numbers. */ uint32_t *data = XNEWVEC (uint32_t, size + 1); data[0] = size; for (index = 0; index < size; index++) { unsigned slot_num; t = lto_tree_ref_encoder_get_tree (encoder, index); streamer_tree_cache_lookup (ob->writer_cache, t, &slot_num); gcc_assert (slot_num != (unsigned)-1); data[index + 1] = slot_num; } lto_write_data (data, sizeof (int32_t) * (size + 1)); free (data); } /* Write all the streams in an lto_out_decl_state STATE using output block OB and output stream OUT_STREAM. */ void lto_output_decl_state_streams (struct output_block *ob, struct lto_out_decl_state *state) { int i; for (i = 0; i < LTO_N_DECL_STREAMS; i++) write_global_stream (ob, &state->streams[i]); } /* Write all the references in an lto_out_decl_state STATE using output block OB and output stream OUT_STREAM. */ void lto_output_decl_state_refs (struct output_block *ob, struct lto_out_decl_state *state) { unsigned i; unsigned ref; tree decl; /* Write reference to FUNCTION_DECL. If there is not function, write reference to void_type_node. */ decl = (state->fn_decl) ? state->fn_decl : void_type_node; streamer_tree_cache_lookup (ob->writer_cache, decl, &ref); gcc_assert (ref != (unsigned)-1); ref = ref * 2 + (state->compressed ? 1 : 0); lto_write_data (&ref, sizeof (uint32_t)); for (i = 0; i < LTO_N_DECL_STREAMS; i++) write_global_references (ob, &state->streams[i]); } /* Return the written size of STATE. */ static size_t lto_out_decl_state_written_size (struct lto_out_decl_state *state) { int i; size_t size; size = sizeof (int32_t); /* fn_ref. */ for (i = 0; i < LTO_N_DECL_STREAMS; i++) { size += sizeof (int32_t); /* vector size. */ size += (lto_tree_ref_encoder_size (&state->streams[i]) * sizeof (int32_t)); } return size; } /* Write symbol T into STREAM in CACHE. SEEN specifies symbols we wrote so far. */ static void write_symbol (struct streamer_tree_cache_d *cache, tree t, hash_set *seen, bool alias) { const char *name; enum gcc_plugin_symbol_kind kind; enum gcc_plugin_symbol_visibility visibility = GCCPV_DEFAULT; unsigned slot_num; uint64_t size; const char *comdat; unsigned char c; gcc_assert (VAR_OR_FUNCTION_DECL_P (t)); name = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (t)); /* This behaves like assemble_name_raw in varasm.c, performing the same name manipulations that ASM_OUTPUT_LABELREF does. */ name = IDENTIFIER_POINTER ((*targetm.asm_out.mangle_assembler_name) (name)); if (seen->add (name)) return; streamer_tree_cache_lookup (cache, t, &slot_num); gcc_assert (slot_num != (unsigned)-1); if (DECL_EXTERNAL (t)) { if (DECL_WEAK (t)) kind = GCCPK_WEAKUNDEF; else kind = GCCPK_UNDEF; } else { if (DECL_WEAK (t)) kind = GCCPK_WEAKDEF; else if (DECL_COMMON (t)) kind = GCCPK_COMMON; else kind = GCCPK_DEF; /* When something is defined, it should have node attached. */ gcc_assert (alias || !VAR_P (t) || varpool_node::get (t)->definition); gcc_assert (alias || TREE_CODE (t) != FUNCTION_DECL || (cgraph_node::get (t) && cgraph_node::get (t)->definition)); } /* Imitate what default_elf_asm_output_external do. When symbol is external, we need to output it with DEFAULT visibility when compiling with -fvisibility=default, while with HIDDEN visibility when symbol has attribute (visibility("hidden")) specified. targetm.binds_local_p check DECL_VISIBILITY_SPECIFIED and gets this right. */ if (DECL_EXTERNAL (t) && !targetm.binds_local_p (t)) visibility = GCCPV_DEFAULT; else switch (DECL_VISIBILITY (t)) { case VISIBILITY_DEFAULT: visibility = GCCPV_DEFAULT; break; case VISIBILITY_PROTECTED: visibility = GCCPV_PROTECTED; break; case VISIBILITY_HIDDEN: visibility = GCCPV_HIDDEN; break; case VISIBILITY_INTERNAL: visibility = GCCPV_INTERNAL; break; } if (kind == GCCPK_COMMON && DECL_SIZE_UNIT (t) && TREE_CODE (DECL_SIZE_UNIT (t)) == INTEGER_CST) size = TREE_INT_CST_LOW (DECL_SIZE_UNIT (t)); else size = 0; if (DECL_ONE_ONLY (t)) comdat = IDENTIFIER_POINTER (decl_comdat_group_id (t)); else comdat = ""; lto_write_data (name, strlen (name) + 1); lto_write_data (comdat, strlen (comdat) + 1); c = (unsigned char) kind; lto_write_data (&c, 1); c = (unsigned char) visibility; lto_write_data (&c, 1); lto_write_data (&size, 8); lto_write_data (&slot_num, 4); } /* Write extension information for symbols (symbol type, section flags). */ static void write_symbol_extension_info (tree t) { unsigned char c; c = ((unsigned char) TREE_CODE (t) == VAR_DECL ? GCCST_VARIABLE : GCCST_FUNCTION); lto_write_data (&c, 1); unsigned char section_kind = 0; if (TREE_CODE (t) == VAR_DECL) { section *s = get_variable_section (t, false); if (s->common.flags & SECTION_BSS) section_kind |= GCCSSK_BSS; } lto_write_data (§ion_kind, 1); } /* Write an IL symbol table to OB. SET and VSET are cgraph/varpool node sets we are outputting. */ static unsigned int produce_symtab (struct output_block *ob) { unsigned int streamed_symbols = 0; struct streamer_tree_cache_d *cache = ob->writer_cache; char *section_name = lto_get_section_name (LTO_section_symtab, NULL, 0, NULL); lto_symtab_encoder_t encoder = ob->decl_state->symtab_node_encoder; lto_symtab_encoder_iterator lsei; lto_begin_section (section_name, false); free (section_name); hash_set seen; /* Write the symbol table. First write everything defined and then all declarations. This is necessary to handle cases where we have duplicated symbols. */ for (lsei = lsei_start (encoder); !lsei_end_p (lsei); lsei_next (&lsei)) { symtab_node *node = lsei_node (lsei); if (DECL_EXTERNAL (node->decl) || !node->output_to_lto_symbol_table_p ()) continue; write_symbol (cache, node->decl, &seen, false); ++streamed_symbols; } for (lsei = lsei_start (encoder); !lsei_end_p (lsei); lsei_next (&lsei)) { symtab_node *node = lsei_node (lsei); if (!DECL_EXTERNAL (node->decl) || !node->output_to_lto_symbol_table_p ()) continue; write_symbol (cache, node->decl, &seen, false); ++streamed_symbols; } lto_end_section (); return streamed_symbols; } /* Symtab extension version. */ #define LTO_SYMTAB_EXTENSION_VERSION 1 /* Write an IL symbol table extension to OB. SET and VSET are cgraph/varpool node sets we are outputting. */ static void produce_symtab_extension (struct output_block *ob, unsigned int previous_streamed_symbols) { unsigned int streamed_symbols = 0; char *section_name = lto_get_section_name (LTO_section_symtab_extension, NULL, 0, NULL); lto_symtab_encoder_t encoder = ob->decl_state->symtab_node_encoder; lto_symtab_encoder_iterator lsei; lto_begin_section (section_name, false); free (section_name); unsigned char version = LTO_SYMTAB_EXTENSION_VERSION; lto_write_data (&version, 1); /* Write the symbol table. First write everything defined and then all declarations. This is necessary to handle cases where we have duplicated symbols. */ for (lsei = lsei_start (encoder); !lsei_end_p (lsei); lsei_next (&lsei)) { symtab_node *node = lsei_node (lsei); if (DECL_EXTERNAL (node->decl) || !node->output_to_lto_symbol_table_p ()) continue; write_symbol_extension_info (node->decl); ++streamed_symbols; } for (lsei = lsei_start (encoder); !lsei_end_p (lsei); lsei_next (&lsei)) { symtab_node *node = lsei_node (lsei); if (!DECL_EXTERNAL (node->decl) || !node->output_to_lto_symbol_table_p ()) continue; write_symbol_extension_info (node->decl); ++streamed_symbols; } gcc_assert (previous_streamed_symbols == streamed_symbols); lto_end_section (); } /* Init the streamer_mode_table for output, where we collect info on what machine_mode values have been streamed. */ void lto_output_init_mode_table (void) { memset (streamer_mode_table, '\0', MAX_MACHINE_MODE); } /* Write the mode table. */ static void lto_write_mode_table (void) { struct output_block *ob; ob = create_output_block (LTO_section_mode_table); bitpack_d bp = bitpack_create (ob->main_stream); /* Ensure that for GET_MODE_INNER (m) != m we have also the inner mode marked. */ for (int i = 0; i < (int) MAX_MACHINE_MODE; i++) if (streamer_mode_table[i]) { machine_mode m = (machine_mode) i; machine_mode inner_m = GET_MODE_INNER (m); if (inner_m != m) streamer_mode_table[(int) inner_m] = 1; } /* First stream modes that have GET_MODE_INNER (m) == m, so that we can refer to them afterwards. */ for (int pass = 0; pass < 2; pass++) for (int i = 0; i < (int) MAX_MACHINE_MODE; i++) if (streamer_mode_table[i] && i != (int) VOIDmode && i != (int) BLKmode) { machine_mode m = (machine_mode) i; if ((GET_MODE_INNER (m) == m) ^ (pass == 0)) continue; bp_pack_value (&bp, m, 8); bp_pack_enum (&bp, mode_class, MAX_MODE_CLASS, GET_MODE_CLASS (m)); bp_pack_poly_value (&bp, GET_MODE_SIZE (m), 16); bp_pack_poly_value (&bp, GET_MODE_PRECISION (m), 16); bp_pack_value (&bp, GET_MODE_INNER (m), 8); bp_pack_poly_value (&bp, GET_MODE_NUNITS (m), 16); switch (GET_MODE_CLASS (m)) { case MODE_FRACT: case MODE_UFRACT: case MODE_ACCUM: case MODE_UACCUM: bp_pack_value (&bp, GET_MODE_IBIT (m), 8); bp_pack_value (&bp, GET_MODE_FBIT (m), 8); break; case MODE_FLOAT: case MODE_DECIMAL_FLOAT: bp_pack_string (ob, &bp, REAL_MODE_FORMAT (m)->name, true); break; default: break; } bp_pack_string (ob, &bp, GET_MODE_NAME (m), true); } bp_pack_value (&bp, VOIDmode, 8); streamer_write_bitpack (&bp); char *section_name = lto_get_section_name (LTO_section_mode_table, NULL, 0, NULL); lto_begin_section (section_name, !flag_wpa); free (section_name); /* The entire header stream is computed here. */ struct lto_simple_header_with_strings header; memset (&header, 0, sizeof (header)); header.main_size = ob->main_stream->total_size; header.string_size = ob->string_stream->total_size; lto_write_data (&header, sizeof header); /* Put all of the gimple and the string table out the asm file as a block of text. */ lto_write_stream (ob->main_stream); lto_write_stream (ob->string_stream); lto_end_section (); destroy_output_block (ob); } /* This pass is run after all of the functions are serialized and all of the IPA passes have written their serialized forms. This pass causes the vector of all of the global decls and types used from this file to be written in to a section that can then be read in to recover these on other side. */ void produce_asm_for_decls (void) { struct lto_out_decl_state *out_state; struct lto_out_decl_state *fn_out_state; struct lto_decl_header header; char *section_name; struct output_block *ob; unsigned idx, num_fns; size_t decl_state_size; int32_t num_decl_states; ob = create_output_block (LTO_section_decls); memset (&header, 0, sizeof (struct lto_decl_header)); section_name = lto_get_section_name (LTO_section_decls, NULL, 0, NULL); lto_begin_section (section_name, !flag_wpa); free (section_name); /* Make string 0 be a NULL string. */ streamer_write_char_stream (ob->string_stream, 0); gcc_assert (!alias_pairs); /* Get rid of the global decl state hash tables to save some memory. */ out_state = lto_get_out_decl_state (); for (int i = 0; i < LTO_N_DECL_STREAMS; i++) if (out_state->streams[i].tree_hash_table) { delete out_state->streams[i].tree_hash_table; out_state->streams[i].tree_hash_table = NULL; } /* Write the global symbols. */ if (streamer_dump_file) fprintf (streamer_dump_file, "Outputting global stream\n"); lto_output_decl_state_streams (ob, out_state); num_fns = lto_function_decl_states.length (); for (idx = 0; idx < num_fns; idx++) { fn_out_state = lto_function_decl_states[idx]; if (streamer_dump_file) fprintf (streamer_dump_file, "Outputting stream for %s\n", IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fn_out_state->fn_decl))); lto_output_decl_state_streams (ob, fn_out_state); } /* Currently not used. This field would allow us to preallocate the globals vector, so that it need not be resized as it is extended. */ header.num_nodes = -1; /* Compute the total size of all decl out states. */ decl_state_size = sizeof (int32_t); decl_state_size += lto_out_decl_state_written_size (out_state); for (idx = 0; idx < num_fns; idx++) { fn_out_state = lto_function_decl_states[idx]; decl_state_size += lto_out_decl_state_written_size (fn_out_state); } header.decl_state_size = decl_state_size; header.main_size = ob->main_stream->total_size; header.string_size = ob->string_stream->total_size; lto_write_data (&header, sizeof header); /* Write the main out-decl state, followed by out-decl states of functions. */ num_decl_states = num_fns + 1; lto_write_data (&num_decl_states, sizeof (num_decl_states)); lto_output_decl_state_refs (ob, out_state); for (idx = 0; idx < num_fns; idx++) { fn_out_state = lto_function_decl_states[idx]; lto_output_decl_state_refs (ob, fn_out_state); } lto_write_stream (ob->main_stream); lto_write_stream (ob->string_stream); lto_end_section (); /* Write the symbol table. It is used by linker to determine dependencies and thus we can skip it for WPA. */ if (!flag_wpa) { unsigned int streamed_symbols = produce_symtab (ob); produce_symtab_extension (ob, streamed_symbols); } /* Write command line opts. */ lto_write_options (); /* Deallocate memory and clean up. */ for (idx = 0; idx < num_fns; idx++) { fn_out_state = lto_function_decl_states[idx]; lto_delete_out_decl_state (fn_out_state); } lto_symtab_encoder_delete (ob->decl_state->symtab_node_encoder); lto_function_decl_states.release (); destroy_output_block (ob); if (lto_stream_offload_p) lto_write_mode_table (); }