gcc/gimple-streamer-out.c

   1 /* Routines for emitting GIMPLE to a file stream.
   2
   3    Copyright (C) 2011-2015 Free Software Foundation, Inc.
   4    Contributed by Diego Novillo <dnovillo@google.com>
   5
   6 This file is part of GCC.
   7
   8 GCC is free software; you can redistribute it and/or modify it under
   9 the terms of the GNU General Public License as published by the Free
  10 Software Foundation; either version 3, or (at your option) any later
  11 version.
  12
  13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  15 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  16 for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with GCC; see the file COPYING3.  If not see
  20 <http://www.gnu.org/licenses/>.  */
  21
  22 #include "config.h"
  23 #include "system.h"
  24 #include "coretypes.h"
  25 #include "alias.h"
  26 #include "backend.h"
  27 #include "tree.h"
  28 #include "gimple.h"
  29 #include "hard-reg-set.h"
  30 #include "options.h"
  31 #include "fold-const.h"
  32 #include "internal-fn.h"
  33 #include "tree-eh.h"
  34 #include "gimple-iterator.h"
  35 #include "gimple-ssa.h"
  36 #include "cgraph.h"
  37 #include "data-streamer.h"
  38 #include "gimple-streamer.h"
  39 #include "lto-streamer.h"
  40 #include "tree-streamer.h"
  41 #include "value-prof.h"
  42
  43 /* Output PHI function PHI to the main stream in OB.  */
  44
  45 static void
  46 output_phi (struct output_block *ob, gphi *phi)
  47 {
  48   unsigned i, len = gimple_phi_num_args (phi);
  49
  50   streamer_write_record_start (ob, lto_gimple_code_to_tag (GIMPLE_PHI));
  51   streamer_write_uhwi (ob, SSA_NAME_VERSION (PHI_RESULT (phi)));
  52
  53   for (i = 0; i < len; i++)
  54     {
  55       stream_write_tree (ob, gimple_phi_arg_def (phi, i), true);
  56       streamer_write_uhwi (ob, gimple_phi_arg_edge (phi, i)->src->index);
  57       bitpack_d bp = bitpack_create (ob->main_stream);
  58       stream_output_location (ob, &bp, gimple_phi_arg_location (phi, i));
  59       streamer_write_bitpack (&bp);
  60     }
  61 }
  62
  63
  64 /* Emit statement STMT on the main stream of output block OB.  */
  65
  66 static void
  67 output_gimple_stmt (struct output_block *ob, gimple stmt)
  68 {
  69   unsigned i;
  70   enum gimple_code code;
  71   enum LTO_tags tag;
  72   struct bitpack_d bp;
  73   histogram_value hist;
  74
  75   /* Emit identifying tag.  */
  76   code = gimple_code (stmt);
  77   tag = lto_gimple_code_to_tag (code);
  78   streamer_write_record_start (ob, tag);
  79
  80   /* Emit the tuple header.  */
  81   bp = bitpack_create (ob->main_stream);
  82   bp_pack_var_len_unsigned (&bp, gimple_num_ops (stmt));
  83   bp_pack_value (&bp, gimple_no_warning_p (stmt), 1);
  84   if (is_gimple_assign (stmt))
  85     bp_pack_value (&bp,
  86                    gimple_assign_nontemporal_move_p (
  87                      as_a <gassign *> (stmt)),
  88                    1);
  89   bp_pack_value (&bp, gimple_has_volatile_ops (stmt), 1);
  90   hist = gimple_histogram_value (cfun, stmt);
  91   bp_pack_value (&bp, hist != NULL, 1);
  92   bp_pack_var_len_unsigned (&bp, stmt->subcode);
  93
  94   /* Emit location information for the statement.  */
  95   stream_output_location (ob, &bp, LOCATION_LOCUS (gimple_location (stmt)));
  96   streamer_write_bitpack (&bp);
  97
  98   /* Emit the lexical block holding STMT.  */
  99   stream_write_tree (ob, gimple_block (stmt), true);
 100
 101   /* Emit the operands.  */
 102   switch (gimple_code (stmt))
 103     {
 104     case GIMPLE_RESX:
 105       streamer_write_hwi (ob, gimple_resx_region (as_a <gresx *> (stmt)));
 106       break;
 107
 108     case GIMPLE_EH_MUST_NOT_THROW:
 109       stream_write_tree (ob,
 110                          gimple_eh_must_not_throw_fndecl (
 111                            as_a <geh_mnt *> (stmt)),
 112                          true);
 113       break;
 114
 115     case GIMPLE_EH_DISPATCH:
 116       streamer_write_hwi (ob,
 117                           gimple_eh_dispatch_region (
 118                             as_a <geh_dispatch *> (stmt)));
 119       break;
 120
 121     case GIMPLE_ASM:
 122       {
 123         gasm *asm_stmt = as_a <gasm *> (stmt);
 124         streamer_write_uhwi (ob, gimple_asm_ninputs (asm_stmt));
 125         streamer_write_uhwi (ob, gimple_asm_noutputs (asm_stmt));
 126         streamer_write_uhwi (ob, gimple_asm_nclobbers (asm_stmt));
 127         streamer_write_uhwi (ob, gimple_asm_nlabels (asm_stmt));
 128         streamer_write_string (ob, ob->main_stream,
 129                                gimple_asm_string (asm_stmt), true);
 130       }
 131       /* Fallthru  */
 132
 133     case GIMPLE_ASSIGN:
 134     case GIMPLE_CALL:
 135     case GIMPLE_RETURN:
 136     case GIMPLE_SWITCH:
 137     case GIMPLE_LABEL:
 138     case GIMPLE_COND:
 139     case GIMPLE_GOTO:
 140     case GIMPLE_DEBUG:
 141       for (i = 0; i < gimple_num_ops (stmt); i++)
 142         {
 143           tree op = gimple_op (stmt, i);
 144           tree *basep = NULL;
 145           /* Wrap all uses of non-automatic variables inside MEM_REFs
 146              so that we do not have to deal with type mismatches on
 147              merged symbols during IL read in.  The first operand
 148              of GIMPLE_DEBUG must be a decl, not MEM_REF, though.  */
 149           if (op && (i || !is_gimple_debug (stmt)))
 150             {
 151               basep = &op;
 152               if (TREE_CODE (*basep) == ADDR_EXPR)
 153                 basep = &TREE_OPERAND (*basep, 0);
 154               while (handled_component_p (*basep))
 155                 basep = &TREE_OPERAND (*basep, 0);
 156               if (TREE_CODE (*basep) == VAR_DECL
 157                   && !auto_var_in_fn_p (*basep, current_function_decl)
 158                   && !DECL_REGISTER (*basep))
 159                 {
 160                   bool volatilep = TREE_THIS_VOLATILE (*basep);
 161                   tree ptrtype = build_pointer_type (TREE_TYPE (*basep));
 162                   *basep = build2 (MEM_REF, TREE_TYPE (*basep),
 163                                    build1 (ADDR_EXPR, ptrtype, *basep),
 164                                    build_int_cst (ptrtype, 0));
 165                   TREE_THIS_VOLATILE (*basep) = volatilep;
 166                 }
 167               else
 168                 basep = NULL;
 169             }
 170           stream_write_tree (ob, op, true);
 171           /* Restore the original base if we wrapped it inside a MEM_REF.  */
 172           if (basep)
 173             *basep = TREE_OPERAND (TREE_OPERAND (*basep, 0), 0);
 174         }
 175       if (is_gimple_call (stmt))
 176         {
 177           if (gimple_call_internal_p (stmt))
 178             streamer_write_enum (ob->main_stream, internal_fn,
 179                                  IFN_LAST, gimple_call_internal_fn (stmt));
 180           else
 181             stream_write_tree (ob, gimple_call_fntype (stmt), true);
 182         }
 183       break;
 184
 185     case GIMPLE_NOP:
 186     case GIMPLE_PREDICT:
 187       break;
 188
 189     case GIMPLE_TRANSACTION:
 190       {
 191         gtransaction *trans_stmt = as_a <gtransaction *> (stmt);
 192         gcc_assert (gimple_transaction_body (trans_stmt) == NULL);
 193         stream_write_tree (ob, gimple_transaction_label (trans_stmt), true);
 194       }
 195       break;
 196
 197     default:
 198       gcc_unreachable ();
 199     }
 200   if (hist)
 201     stream_out_histogram_value (ob, hist);
 202 }
 203
 204
 205 /* Output a basic block BB to the main stream in OB for this FN.  */
 206
 207 void
 208 output_bb (struct output_block *ob, basic_block bb, struct function *fn)
 209 {
 210   gimple_stmt_iterator bsi = gsi_start_bb (bb);
 211
 212   streamer_write_record_start (ob,
 213                                (!gsi_end_p (bsi)) || phi_nodes (bb)
 214                                 ? LTO_bb1
 215                                 : LTO_bb0);
 216
 217   streamer_write_uhwi (ob, bb->index);
 218   streamer_write_gcov_count (ob, bb->count);
 219   streamer_write_hwi (ob, bb->frequency);
 220   streamer_write_hwi (ob, bb->flags);
 221
 222   if (!gsi_end_p (bsi) || phi_nodes (bb))
 223     {
 224       /* Output the statements.  The list of statements is terminated
 225          with a zero.  */
 226       for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi))
 227         {
 228           int region;
 229           gimple stmt = gsi_stmt (bsi);
 230
 231           output_gimple_stmt (ob, stmt);
 232
 233           /* Emit the EH region holding STMT.  */
 234           region = lookup_stmt_eh_lp_fn (fn, stmt);
 235           if (region != 0)
 236             {
 237               streamer_write_record_start (ob, LTO_eh_region);
 238               streamer_write_hwi (ob, region);
 239             }
 240           else
 241             streamer_write_record_start (ob, LTO_null);
 242         }
 243
 244       streamer_write_record_start (ob, LTO_null);
 245
 246       for (gphi_iterator psi = gsi_start_phis (bb);
 247            !gsi_end_p (psi);
 248            gsi_next (&psi))
 249         {
 250           gphi *phi = psi.phi ();
 251
 252           /* Only emit PHIs for gimple registers.  PHI nodes for .MEM
 253              will be filled in on reading when the SSA form is
 254              updated.  */
 255           if (!virtual_operand_p (gimple_phi_result (phi)))
 256             output_phi (ob, phi);
 257         }
 258
 259       streamer_write_record_start (ob, LTO_null);
 260     }
 261 }