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