gcc/gimple-streamer-out.c

   1 /* Routines for emitting GIMPLE to a file stream.
   2
   3    Copyright (C) 2011-2013 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 "tree.h"
  26 #include "gimple.h"
  27 #include "gimple-ssa.h"
  28 #include "data-streamer.h"
  29 #include "gimple-streamer.h"
  30 #include "lto-streamer.h"
  31 #include "tree-streamer.h"
  32 #include "value-prof.h"
  33
  34 /* Output PHI function PHI to the main stream in OB.  */
  35
  36 static void
  37 output_phi (struct output_block *ob, gimple phi)
  38 {
  39   unsigned i, len = gimple_phi_num_args (phi);
  40
  41   streamer_write_record_start (ob, lto_gimple_code_to_tag (GIMPLE_PHI));
  42   streamer_write_uhwi (ob, SSA_NAME_VERSION (PHI_RESULT (phi)));
  43
  44   for (i = 0; i < len; i++)
  45     {
  46       stream_write_tree (ob, gimple_phi_arg_def (phi, i), true);
  47       streamer_write_uhwi (ob, gimple_phi_arg_edge (phi, i)->src->index);
  48       bitpack_d bp = bitpack_create (ob->main_stream);
  49       stream_output_location (ob, &bp, gimple_phi_arg_location (phi, i));
  50       streamer_write_bitpack (&bp);
  51     }
  52 }
  53
  54
  55 /* Emit statement STMT on the main stream of output block OB.  */
  56
  57 static void
  58 output_gimple_stmt (struct output_block *ob, gimple stmt)
  59 {
  60   unsigned i;
  61   enum gimple_code code;
  62   enum LTO_tags tag;
  63   struct bitpack_d bp;
  64   histogram_value hist;
  65
  66   /* Emit identifying tag.  */
  67   code = gimple_code (stmt);
  68   tag = lto_gimple_code_to_tag (code);
  69   streamer_write_record_start (ob, tag);
  70
  71   /* Emit the tuple header.  */
  72   bp = bitpack_create (ob->main_stream);
  73   bp_pack_var_len_unsigned (&bp, gimple_num_ops (stmt));
  74   bp_pack_value (&bp, gimple_no_warning_p (stmt), 1);
  75   if (is_gimple_assign (stmt))
  76     bp_pack_value (&bp, gimple_assign_nontemporal_move_p (stmt), 1);
  77   bp_pack_value (&bp, gimple_has_volatile_ops (stmt), 1);
  78   hist = gimple_histogram_value (cfun, stmt);
  79   bp_pack_value (&bp, hist != NULL, 1);
  80   bp_pack_var_len_unsigned (&bp, stmt->gsbase.subcode);
  81
  82   /* Emit location information for the statement.  */
  83   stream_output_location (ob, &bp, LOCATION_LOCUS (gimple_location (stmt)));
  84   streamer_write_bitpack (&bp);
  85
  86   /* Emit the lexical block holding STMT.  */
  87   stream_write_tree (ob, gimple_block (stmt), true);
  88
  89   /* Emit the operands.  */
  90   switch (gimple_code (stmt))
  91     {
  92     case GIMPLE_RESX:
  93       streamer_write_hwi (ob, gimple_resx_region (stmt));
  94       break;
  95
  96     case GIMPLE_EH_MUST_NOT_THROW:
  97       stream_write_tree (ob, gimple_eh_must_not_throw_fndecl (stmt), true);
  98       break;
  99
 100     case GIMPLE_EH_DISPATCH:
 101       streamer_write_hwi (ob, gimple_eh_dispatch_region (stmt));
 102       break;
 103
 104     case GIMPLE_ASM:
 105       streamer_write_uhwi (ob, gimple_asm_ninputs (stmt));
 106       streamer_write_uhwi (ob, gimple_asm_noutputs (stmt));
 107       streamer_write_uhwi (ob, gimple_asm_nclobbers (stmt));
 108       streamer_write_uhwi (ob, gimple_asm_nlabels (stmt));
 109       streamer_write_string (ob, ob->main_stream, gimple_asm_string (stmt),
 110                              true);
 111       /* Fallthru  */
 112
 113     case GIMPLE_ASSIGN:
 114     case GIMPLE_CALL:
 115     case GIMPLE_RETURN:
 116     case GIMPLE_SWITCH:
 117     case GIMPLE_LABEL:
 118     case GIMPLE_COND:
 119     case GIMPLE_GOTO:
 120     case GIMPLE_DEBUG:
 121       for (i = 0; i < gimple_num_ops (stmt); i++)
 122         {
 123           tree op = gimple_op (stmt, i);
 124           tree *basep = NULL;
 125           /* Wrap all uses of non-automatic variables inside MEM_REFs
 126              so that we do not have to deal with type mismatches on
 127              merged symbols during IL read in.  The first operand
 128              of GIMPLE_DEBUG must be a decl, not MEM_REF, though.  */
 129           if (op && (i || !is_gimple_debug (stmt)))
 130             {
 131               basep = &op;
 132               while (handled_component_p (*basep))
 133                 basep = &TREE_OPERAND (*basep, 0);
 134               if (TREE_CODE (*basep) == VAR_DECL
 135                   && !auto_var_in_fn_p (*basep, current_function_decl)
 136                   && !DECL_REGISTER (*basep))
 137                 {
 138                   bool volatilep = TREE_THIS_VOLATILE (*basep);
 139                   *basep = build2 (MEM_REF, TREE_TYPE (*basep),
 140                                    build_fold_addr_expr (*basep),
 141                                    build_int_cst (build_pointer_type
 142                                                   (TREE_TYPE (*basep)), 0));
 143                   TREE_THIS_VOLATILE (*basep) = volatilep;
 144                 }
 145               else
 146                 basep = NULL;
 147             }
 148           stream_write_tree (ob, op, true);
 149           /* Restore the original base if we wrapped it inside a MEM_REF.  */
 150           if (basep)
 151             *basep = TREE_OPERAND (TREE_OPERAND (*basep, 0), 0);
 152         }
 153       if (is_gimple_call (stmt))
 154         {
 155           if (gimple_call_internal_p (stmt))
 156             streamer_write_enum (ob->main_stream, internal_fn,
 157                                  IFN_LAST, gimple_call_internal_fn (stmt));
 158           else
 159             stream_write_tree (ob, gimple_call_fntype (stmt), true);
 160         }
 161       break;
 162
 163     case GIMPLE_NOP:
 164     case GIMPLE_PREDICT:
 165       break;
 166
 167     case GIMPLE_TRANSACTION:
 168       gcc_assert (gimple_transaction_body (stmt) == NULL);
 169       stream_write_tree (ob, gimple_transaction_label (stmt), true);
 170       break;
 171
 172     default:
 173       gcc_unreachable ();
 174     }
 175   if (hist)
 176     stream_out_histogram_value (ob, hist);
 177 }
 178
 179
 180 /* Output a basic block BB to the main stream in OB for this FN.  */
 181
 182 void
 183 output_bb (struct output_block *ob, basic_block bb, struct function *fn)
 184 {
 185   gimple_stmt_iterator bsi = gsi_start_bb (bb);
 186
 187   streamer_write_record_start (ob,
 188                                (!gsi_end_p (bsi)) || phi_nodes (bb)
 189                                 ? LTO_bb1
 190                                 : LTO_bb0);
 191
 192   streamer_write_uhwi (ob, bb->index);
 193   streamer_write_gcov_count (ob, bb->count);
 194   streamer_write_hwi (ob, bb->frequency);
 195   streamer_write_hwi (ob, bb->flags);
 196
 197   if (!gsi_end_p (bsi) || phi_nodes (bb))
 198     {
 199       /* Output the statements.  The list of statements is terminated
 200          with a zero.  */
 201       for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi))
 202         {
 203           int region;
 204           gimple stmt = gsi_stmt (bsi);
 205
 206           output_gimple_stmt (ob, stmt);
 207
 208           /* Emit the EH region holding STMT.  */
 209           region = lookup_stmt_eh_lp_fn (fn, stmt);
 210           if (region != 0)
 211             {
 212               streamer_write_record_start (ob, LTO_eh_region);
 213               streamer_write_hwi (ob, region);
 214             }
 215           else
 216             streamer_write_record_start (ob, LTO_null);
 217         }
 218
 219       streamer_write_record_start (ob, LTO_null);
 220
 221       for (bsi = gsi_start_phis (bb); !gsi_end_p (bsi); gsi_next (&bsi))
 222         {
 223           gimple phi = gsi_stmt (bsi);
 224
 225           /* Only emit PHIs for gimple registers.  PHI nodes for .MEM
 226              will be filled in on reading when the SSA form is
 227              updated.  */
 228           if (!virtual_operand_p (gimple_phi_result (phi)))
 229             output_phi (ob, phi);
 230         }
 231
 232       streamer_write_record_start (ob, LTO_null);
 233     }
 234 }