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 "symtab.h"
  27 #include "options.h"
  28 #include "tree.h"
  29 #include "fold-const.h"
  30 #include "predict.h"
  31 #include "tm.h"
  32 #include "hard-reg-set.h"
  33 #include "function.h"
  34 #include "basic-block.h"
  35 #include "tree-ssa-alias.h"
  36 #include "internal-fn.h"
  37 #include "tree-eh.h"
  38 #include "gimple-expr.h"
  39 #include "gimple.h"
  40 #include "gimple-iterator.h"
  41 #include "gimple-ssa.h"
  42 #include "cgraph.h"
  43 #include "data-streamer.h"
  44 #include "gimple-streamer.h"
  45 #include "lto-streamer.h"
  46 #include "tree-streamer.h"
  47 #include "value-prof.h"
  48
  49 /* Output PHI function PHI to the main stream in OB.  */
  50
  51 static void
  52 output_phi (struct output_block *ob, gphi *phi)
  53 {
  54   unsigned i, len = gimple_phi_num_args (phi);
  55
  56   streamer_write_record_start (ob, lto_gimple_code_to_tag (GIMPLE_PHI));
  57   streamer_write_uhwi (ob, SSA_NAME_VERSION (PHI_RESULT (phi)));
  58
  59   for (i = 0; i < len; i++)
  60     {
  61       stream_write_tree (ob, gimple_phi_arg_def (phi, i), true);
  62       streamer_write_uhwi (ob, gimple_phi_arg_edge (phi, i)->src->index);
  63       bitpack_d bp = bitpack_create (ob->main_stream);
  64       stream_output_location (ob, &bp, gimple_phi_arg_location (phi, i));
  65       streamer_write_bitpack (&bp);
  66     }
  67 }
  68
  69
  70 /* Emit statement STMT on the main stream of output block OB.  */
  71
  72 static void
  73 output_gimple_stmt (struct output_block *ob, gimple stmt)
  74 {
  75   unsigned i;
  76   enum gimple_code code;
  77   enum LTO_tags tag;
  78   struct bitpack_d bp;
  79   histogram_value hist;
  80
  81   /* Emit identifying tag.  */
  82   code = gimple_code (stmt);
  83   tag = lto_gimple_code_to_tag (code);
  84   streamer_write_record_start (ob, tag);
  85
  86   /* Emit the tuple header.  */
  87   bp = bitpack_create (ob->main_stream);
  88   bp_pack_var_len_unsigned (&bp, gimple_num_ops (stmt));
  89   bp_pack_value (&bp, gimple_no_warning_p (stmt), 1);
  90   if (is_gimple_assign (stmt))
  91     bp_pack_value (&bp,
  92                    gimple_assign_nontemporal_move_p (
  93                      as_a <gassign *> (stmt)),
  94                    1);
  95   bp_pack_value (&bp, gimple_has_volatile_ops (stmt), 1);
  96   hist = gimple_histogram_value (cfun, stmt);
  97   bp_pack_value (&bp, hist != NULL, 1);
  98   bp_pack_var_len_unsigned (&bp, stmt->subcode);
  99
 100   /* Emit location information for the statement.  */
 101   stream_output_location (ob, &bp, LOCATION_LOCUS (gimple_location (stmt)));
 102   streamer_write_bitpack (&bp);
 103
 104   /* Emit the lexical block holding STMT.  */
 105   stream_write_tree (ob, gimple_block (stmt), true);
 106
 107   /* Emit the operands.  */
 108   switch (gimple_code (stmt))
 109     {
 110     case GIMPLE_RESX:
 111       streamer_write_hwi (ob, gimple_resx_region (as_a <gresx *> (stmt)));
 112       break;
 113
 114     case GIMPLE_EH_MUST_NOT_THROW:
 115       stream_write_tree (ob,
 116                          gimple_eh_must_not_throw_fndecl (
 117                            as_a <geh_mnt *> (stmt)),
 118                          true);
 119       break;
 120
 121     case GIMPLE_EH_DISPATCH:
 122       streamer_write_hwi (ob,
 123                           gimple_eh_dispatch_region (
 124                             as_a <geh_dispatch *> (stmt)));
 125       break;
 126
 127     case GIMPLE_ASM:
 128       {
 129         gasm *asm_stmt = as_a <gasm *> (stmt);
 130         streamer_write_uhwi (ob, gimple_asm_ninputs (asm_stmt));
 131         streamer_write_uhwi (ob, gimple_asm_noutputs (asm_stmt));
 132         streamer_write_uhwi (ob, gimple_asm_nclobbers (asm_stmt));
 133         streamer_write_uhwi (ob, gimple_asm_nlabels (asm_stmt));
 134         streamer_write_string (ob, ob->main_stream,
 135                                gimple_asm_string (asm_stmt), true);
 136       }
 137       /* Fallthru  */
 138
 139     case GIMPLE_ASSIGN:
 140     case GIMPLE_CALL:
 141     case GIMPLE_RETURN:
 142     case GIMPLE_SWITCH:
 143     case GIMPLE_LABEL:
 144     case GIMPLE_COND:
 145     case GIMPLE_GOTO:
 146     case GIMPLE_DEBUG:
 147       for (i = 0; i < gimple_num_ops (stmt); i++)
 148         {
 149           tree op = gimple_op (stmt, i);
 150           tree *basep = NULL;
 151           /* Wrap all uses of non-automatic variables inside MEM_REFs
 152              so that we do not have to deal with type mismatches on
 153              merged symbols during IL read in.  The first operand
 154              of GIMPLE_DEBUG must be a decl, not MEM_REF, though.  */
 155           if (op && (i || !is_gimple_debug (stmt)))
 156             {
 157               basep = &op;
 158               if (TREE_CODE (*basep) == ADDR_EXPR)
 159                 basep = &TREE_OPERAND (*basep, 0);
 160               while (handled_component_p (*basep))
 161                 basep = &TREE_OPERAND (*basep, 0);
 162               if (TREE_CODE (*basep) == VAR_DECL
 163                   && !auto_var_in_fn_p (*basep, current_function_decl)
 164                   && !DECL_REGISTER (*basep))
 165                 {
 166                   bool volatilep = TREE_THIS_VOLATILE (*basep);
 167                   tree ptrtype = build_pointer_type (TREE_TYPE (*basep));
 168                   *basep = build2 (MEM_REF, TREE_TYPE (*basep),
 169                                    build1 (ADDR_EXPR, ptrtype, *basep),
 170                                    build_int_cst (ptrtype, 0));
 171                   TREE_THIS_VOLATILE (*basep) = volatilep;
 172                 }
 173               else
 174                 basep = NULL;
 175             }
 176           stream_write_tree (ob, op, true);
 177           /* Restore the original base if we wrapped it inside a MEM_REF.  */
 178           if (basep)
 179             *basep = TREE_OPERAND (TREE_OPERAND (*basep, 0), 0);
 180         }
 181       if (is_gimple_call (stmt))
 182         {
 183           if (gimple_call_internal_p (stmt))
 184             streamer_write_enum (ob->main_stream, internal_fn,
 185                                  IFN_LAST, gimple_call_internal_fn (stmt));
 186           else
 187             stream_write_tree (ob, gimple_call_fntype (stmt), true);
 188         }
 189       break;
 190
 191     case GIMPLE_NOP:
 192     case GIMPLE_PREDICT:
 193       break;
 194
 195     case GIMPLE_TRANSACTION:
 196       {
 197         gtransaction *trans_stmt = as_a <gtransaction *> (stmt);
 198         gcc_assert (gimple_transaction_body (trans_stmt) == NULL);
 199         stream_write_tree (ob, gimple_transaction_label (trans_stmt), true);
 200       }
 201       break;
 202
 203     default:
 204       gcc_unreachable ();
 205     }
 206   if (hist)
 207     stream_out_histogram_value (ob, hist);
 208 }
 209
 210
 211 /* Output a basic block BB to the main stream in OB for this FN.  */
 212
 213 void
 214 output_bb (struct output_block *ob, basic_block bb, struct function *fn)
 215 {
 216   gimple_stmt_iterator bsi = gsi_start_bb (bb);
 217
 218   streamer_write_record_start (ob,
 219                                (!gsi_end_p (bsi)) || phi_nodes (bb)
 220                                 ? LTO_bb1
 221                                 : LTO_bb0);
 222
 223   streamer_write_uhwi (ob, bb->index);
 224   streamer_write_gcov_count (ob, bb->count);
 225   streamer_write_hwi (ob, bb->frequency);
 226   streamer_write_hwi (ob, bb->flags);
 227
 228   if (!gsi_end_p (bsi) || phi_nodes (bb))
 229     {
 230       /* Output the statements.  The list of statements is terminated
 231          with a zero.  */
 232       for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi))
 233         {
 234           int region;
 235           gimple stmt = gsi_stmt (bsi);
 236
 237           output_gimple_stmt (ob, stmt);
 238
 239           /* Emit the EH region holding STMT.  */
 240           region = lookup_stmt_eh_lp_fn (fn, stmt);
 241           if (region != 0)
 242             {
 243               streamer_write_record_start (ob, LTO_eh_region);
 244               streamer_write_hwi (ob, region);
 245             }
 246           else
 247             streamer_write_record_start (ob, LTO_null);
 248         }
 249
 250       streamer_write_record_start (ob, LTO_null);
 251
 252       for (gphi_iterator psi = gsi_start_phis (bb);
 253            !gsi_end_p (psi);
 254            gsi_next (&psi))
 255         {
 256           gphi *phi = psi.phi ();
 257
 258           /* Only emit PHIs for gimple registers.  PHI nodes for .MEM
 259              will be filled in on reading when the SSA form is
 260              updated.  */
 261           if (!virtual_operand_p (gimple_phi_result (phi)))
 262             output_phi (ob, phi);
 263         }
 264
 265       streamer_write_record_start (ob, LTO_null);
 266     }
 267 }