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