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