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 "plugin-api.h"
  43 #include "ipa-ref.h"
  44 #include "cgraph.h"
  45 #include "data-streamer.h"
  46 #include "gimple-streamer.h"
  47 #include "lto-streamer.h"
  48 #include "tree-streamer.h"
  49 #include "value-prof.h"
  50
  51 /* Output PHI function PHI to the main stream in OB.  */
  52
  53 static void
  54 output_phi (struct output_block *ob, gphi *phi)
  55 {
  56   unsigned i, len = gimple_phi_num_args (phi);
  57
  58   streamer_write_record_start (ob, lto_gimple_code_to_tag (GIMPLE_PHI));
  59   streamer_write_uhwi (ob, SSA_NAME_VERSION (PHI_RESULT (phi)));
  60
  61   for (i = 0; i < len; i++)
  62     {
  63       stream_write_tree (ob, gimple_phi_arg_def (phi, i), true);
  64       streamer_write_uhwi (ob, gimple_phi_arg_edge (phi, i)->src->index);
  65       bitpack_d bp = bitpack_create (ob->main_stream);
  66       stream_output_location (ob, &bp, gimple_phi_arg_location (phi, i));
  67       streamer_write_bitpack (&bp);
  68     }
  69 }
  70
  71
  72 /* Emit statement STMT on the main stream of output block OB.  */
  73
  74 static void
  75 output_gimple_stmt (struct output_block *ob, gimple stmt)
  76 {
  77   unsigned i;
  78   enum gimple_code code;
  79   enum LTO_tags tag;
  80   struct bitpack_d bp;
  81   histogram_value hist;
  82
  83   /* Emit identifying tag.  */
  84   code = gimple_code (stmt);
  85   tag = lto_gimple_code_to_tag (code);
  86   streamer_write_record_start (ob, tag);
  87
  88   /* Emit the tuple header.  */
  89   bp = bitpack_create (ob->main_stream);
  90   bp_pack_var_len_unsigned (&bp, gimple_num_ops (stmt));
  91   bp_pack_value (&bp, gimple_no_warning_p (stmt), 1);
  92   if (is_gimple_assign (stmt))
  93     bp_pack_value (&bp,
  94                    gimple_assign_nontemporal_move_p (
  95                      as_a <gassign *> (stmt)),
  96                    1);
  97   bp_pack_value (&bp, gimple_has_volatile_ops (stmt), 1);
  98   hist = gimple_histogram_value (cfun, stmt);
  99   bp_pack_value (&bp, hist != NULL, 1);
 100   bp_pack_var_len_unsigned (&bp, stmt->subcode);
 101
 102   /* Emit location information for the statement.  */
 103   stream_output_location (ob, &bp, LOCATION_LOCUS (gimple_location (stmt)));
 104   streamer_write_bitpack (&bp);
 105
 106   /* Emit the lexical block holding STMT.  */
 107   stream_write_tree (ob, gimple_block (stmt), true);
 108
 109   /* Emit the operands.  */
 110   switch (gimple_code (stmt))
 111     {
 112     case GIMPLE_RESX:
 113       streamer_write_hwi (ob, gimple_resx_region (as_a <gresx *> (stmt)));
 114       break;
 115
 116     case GIMPLE_EH_MUST_NOT_THROW:
 117       stream_write_tree (ob,
 118                          gimple_eh_must_not_throw_fndecl (
 119                            as_a <geh_mnt *> (stmt)),
 120                          true);
 121       break;
 122
 123     case GIMPLE_EH_DISPATCH:
 124       streamer_write_hwi (ob,
 125                           gimple_eh_dispatch_region (
 126                             as_a <geh_dispatch *> (stmt)));
 127       break;
 128
 129     case GIMPLE_ASM:
 130       {
 131         gasm *asm_stmt = as_a <gasm *> (stmt);
 132         streamer_write_uhwi (ob, gimple_asm_ninputs (asm_stmt));
 133         streamer_write_uhwi (ob, gimple_asm_noutputs (asm_stmt));
 134         streamer_write_uhwi (ob, gimple_asm_nclobbers (asm_stmt));
 135         streamer_write_uhwi (ob, gimple_asm_nlabels (asm_stmt));
 136         streamer_write_string (ob, ob->main_stream,
 137                                gimple_asm_string (asm_stmt), true);
 138       }
 139       /* Fallthru  */
 140
 141     case GIMPLE_ASSIGN:
 142     case GIMPLE_CALL:
 143     case GIMPLE_RETURN:
 144     case GIMPLE_SWITCH:
 145     case GIMPLE_LABEL:
 146     case GIMPLE_COND:
 147     case GIMPLE_GOTO:
 148     case GIMPLE_DEBUG:
 149       for (i = 0; i < gimple_num_ops (stmt); i++)
 150         {
 151           tree op = gimple_op (stmt, i);
 152           tree *basep = NULL;
 153           /* Wrap all uses of non-automatic variables inside MEM_REFs
 154              so that we do not have to deal with type mismatches on
 155              merged symbols during IL read in.  The first operand
 156              of GIMPLE_DEBUG must be a decl, not MEM_REF, though.  */
 157           if (op && (i || !is_gimple_debug (stmt)))
 158             {
 159               basep = &op;
 160               if (TREE_CODE (*basep) == ADDR_EXPR)
 161                 basep = &TREE_OPERAND (*basep, 0);
 162               while (handled_component_p (*basep))
 163                 basep = &TREE_OPERAND (*basep, 0);
 164               if (TREE_CODE (*basep) == VAR_DECL
 165                   && !auto_var_in_fn_p (*basep, current_function_decl)
 166                   && !DECL_REGISTER (*basep))
 167                 {
 168                   bool volatilep = TREE_THIS_VOLATILE (*basep);
 169                   tree ptrtype = build_pointer_type (TREE_TYPE (*basep));
 170                   *basep = build2 (MEM_REF, TREE_TYPE (*basep),
 171                                    build1 (ADDR_EXPR, ptrtype, *basep),
 172                                    build_int_cst (ptrtype, 0));
 173                   TREE_THIS_VOLATILE (*basep) = volatilep;
 174                 }
 175               else
 176                 basep = NULL;
 177             }
 178           stream_write_tree (ob, op, true);
 179           /* Restore the original base if we wrapped it inside a MEM_REF.  */
 180           if (basep)
 181             *basep = TREE_OPERAND (TREE_OPERAND (*basep, 0), 0);
 182         }
 183       if (is_gimple_call (stmt))
 184         {
 185           if (gimple_call_internal_p (stmt))
 186             streamer_write_enum (ob->main_stream, internal_fn,
 187                                  IFN_LAST, gimple_call_internal_fn (stmt));
 188           else
 189             stream_write_tree (ob, gimple_call_fntype (stmt), true);
 190         }
 191       break;
 192
 193     case GIMPLE_NOP:
 194     case GIMPLE_PREDICT:
 195       break;
 196
 197     case GIMPLE_TRANSACTION:
 198       {
 199         gtransaction *trans_stmt = as_a <gtransaction *> (stmt);
 200         gcc_assert (gimple_transaction_body (trans_stmt) == NULL);
 201         stream_write_tree (ob, gimple_transaction_label (trans_stmt), true);
 202       }
 203       break;
 204
 205     default:
 206       gcc_unreachable ();
 207     }
 208   if (hist)
 209     stream_out_histogram_value (ob, hist);
 210 }
 211
 212
 213 /* Output a basic block BB to the main stream in OB for this FN.  */
 214
 215 void
 216 output_bb (struct output_block *ob, basic_block bb, struct function *fn)
 217 {
 218   gimple_stmt_iterator bsi = gsi_start_bb (bb);
 219
 220   streamer_write_record_start (ob,
 221                                (!gsi_end_p (bsi)) || phi_nodes (bb)
 222                                 ? LTO_bb1
 223                                 : LTO_bb0);
 224
 225   streamer_write_uhwi (ob, bb->index);
 226   streamer_write_gcov_count (ob, bb->count);
 227   streamer_write_hwi (ob, bb->frequency);
 228   streamer_write_hwi (ob, bb->flags);
 229
 230   if (!gsi_end_p (bsi) || phi_nodes (bb))
 231     {
 232       /* Output the statements.  The list of statements is terminated
 233          with a zero.  */
 234       for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi))
 235         {
 236           int region;
 237           gimple stmt = gsi_stmt (bsi);
 238
 239           output_gimple_stmt (ob, stmt);
 240
 241           /* Emit the EH region holding STMT.  */
 242           region = lookup_stmt_eh_lp_fn (fn, stmt);
 243           if (region != 0)
 244             {
 245               streamer_write_record_start (ob, LTO_eh_region);
 246               streamer_write_hwi (ob, region);
 247             }
 248           else
 249             streamer_write_record_start (ob, LTO_null);
 250         }
 251
 252       streamer_write_record_start (ob, LTO_null);
 253
 254       for (gphi_iterator psi = gsi_start_phis (bb);
 255            !gsi_end_p (psi);
 256            gsi_next (&psi))
 257         {
 258           gphi *phi = psi.phi ();
 259
 260           /* Only emit PHIs for gimple registers.  PHI nodes for .MEM
 261              will be filled in on reading when the SSA form is
 262              updated.  */
 263           if (!virtual_operand_p (gimple_phi_result (phi)))
 264             output_phi (ob, phi);
 265         }
 266
 267       streamer_write_record_start (ob, LTO_null);
 268     }
 269 }