gcc/gimple-streamer-out.c

   1 /* Routines for emitting GIMPLE to a file stream.
   2
   3    Copyright (C) 2011-2014 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 "basic-block.h"
  27 #include "tree-ssa-alias.h"
  28 #include "internal-fn.h"
  29 #include "tree-eh.h"
  30 #include "gimple-expr.h"
  31 #include "is-a.h"
  32 #include "gimple.h"
  33 #include "gimple-iterator.h"
  34 #include "gimple-ssa.h"
  35 #include "data-streamer.h"
  36 #include "gimple-streamer.h"
  37 #include "lto-streamer.h"
  38 #include "tree-streamer.h"
  39 #include "value-prof.h"
  40
  41 /* Output PHI function PHI to the main stream in OB.  */
  42
  43 static void
  44 output_phi (struct output_block *ob, gimple_phi phi)
  45 {
  46   unsigned i, len = gimple_phi_num_args (phi);
  47
  48   streamer_write_record_start (ob, lto_gimple_code_to_tag (GIMPLE_PHI));
  49   streamer_write_uhwi (ob, SSA_NAME_VERSION (PHI_RESULT (phi)));
  50
  51   for (i = 0; i < len; i++)
  52     {
  53       stream_write_tree (ob, gimple_phi_arg_def (phi, i), true);
  54       streamer_write_uhwi (ob, gimple_phi_arg_edge (phi, i)->src->index);
  55       bitpack_d bp = bitpack_create (ob->main_stream);
  56       stream_output_location (ob, &bp, gimple_phi_arg_location (phi, i));
  57       streamer_write_bitpack (&bp);
  58     }
  59 }
  60
  61
  62 /* Emit statement STMT on the main stream of output block OB.  */
  63
  64 static void
  65 output_gimple_stmt (struct output_block *ob, gimple stmt)
  66 {
  67   unsigned i;
  68   enum gimple_code code;
  69   enum LTO_tags tag;
  70   struct bitpack_d bp;
  71   histogram_value hist;
  72
  73   /* Emit identifying tag.  */
  74   code = gimple_code (stmt);
  75   tag = lto_gimple_code_to_tag (code);
  76   streamer_write_record_start (ob, tag);
  77
  78   /* Emit the tuple header.  */
  79   bp = bitpack_create (ob->main_stream);
  80   bp_pack_var_len_unsigned (&bp, gimple_num_ops (stmt));
  81   bp_pack_value (&bp, gimple_no_warning_p (stmt), 1);
  82   if (is_gimple_assign (stmt))
  83     bp_pack_value (&bp, gimple_assign_nontemporal_move_p (stmt), 1);
  84   bp_pack_value (&bp, gimple_has_volatile_ops (stmt), 1);
  85   hist = gimple_histogram_value (cfun, stmt);
  86   bp_pack_value (&bp, hist != NULL, 1);
  87   bp_pack_var_len_unsigned (&bp, stmt->subcode);
  88
  89   /* Emit location information for the statement.  */
  90   stream_output_location (ob, &bp, LOCATION_LOCUS (gimple_location (stmt)));
  91   streamer_write_bitpack (&bp);
  92
  93   /* Emit the lexical block holding STMT.  */
  94   stream_write_tree (ob, gimple_block (stmt), true);
  95
  96   /* Emit the operands.  */
  97   switch (gimple_code (stmt))
  98     {
  99     case GIMPLE_RESX:
 100       streamer_write_hwi (ob, gimple_resx_region (as_a <gimple_resx> (stmt)));
 101       break;
 102
 103     case GIMPLE_EH_MUST_NOT_THROW:
 104       stream_write_tree (ob,
 105                          gimple_eh_must_not_throw_fndecl (
 106                            as_a <gimple_eh_must_not_throw> (stmt)),
 107                          true);
 108       break;
 109
 110     case GIMPLE_EH_DISPATCH:
 111       streamer_write_hwi (ob,
 112                           gimple_eh_dispatch_region (
 113                             as_a <gimple_eh_dispatch> (stmt)));
 114       break;
 115
 116     case GIMPLE_ASM:
 117       {
 118         gimple_asm asm_stmt = as_a <gimple_asm> (stmt);
 119         streamer_write_uhwi (ob, gimple_asm_ninputs (asm_stmt));
 120         streamer_write_uhwi (ob, gimple_asm_noutputs (asm_stmt));
 121         streamer_write_uhwi (ob, gimple_asm_nclobbers (asm_stmt));
 122         streamer_write_uhwi (ob, gimple_asm_nlabels (asm_stmt));
 123         streamer_write_string (ob, ob->main_stream,
 124                                gimple_asm_string (asm_stmt), true);
 125       }
 126       /* Fallthru  */
 127
 128     case GIMPLE_ASSIGN:
 129     case GIMPLE_CALL:
 130     case GIMPLE_RETURN:
 131     case GIMPLE_SWITCH:
 132     case GIMPLE_LABEL:
 133     case GIMPLE_COND:
 134     case GIMPLE_GOTO:
 135     case GIMPLE_DEBUG:
 136       for (i = 0; i < gimple_num_ops (stmt); i++)
 137         {
 138           tree op = gimple_op (stmt, i);
 139           tree *basep = NULL;
 140           /* Wrap all uses of non-automatic variables inside MEM_REFs
 141              so that we do not have to deal with type mismatches on
 142              merged symbols during IL read in.  The first operand
 143              of GIMPLE_DEBUG must be a decl, not MEM_REF, though.  */
 144           if (op && (i || !is_gimple_debug (stmt)))
 145             {
 146               basep = &op;
 147               if (TREE_CODE (*basep) == ADDR_EXPR)
 148                 basep = &TREE_OPERAND (*basep, 0);
 149               while (handled_component_p (*basep))
 150                 basep = &TREE_OPERAND (*basep, 0);
 151               if (TREE_CODE (*basep) == VAR_DECL
 152                   && !auto_var_in_fn_p (*basep, current_function_decl)
 153                   && !DECL_REGISTER (*basep))
 154                 {
 155                   bool volatilep = TREE_THIS_VOLATILE (*basep);
 156                   tree ptrtype = build_pointer_type (TREE_TYPE (*basep));
 157                   *basep = build2 (MEM_REF, TREE_TYPE (*basep),
 158                                    build1 (ADDR_EXPR, ptrtype, *basep),
 159                                    build_int_cst (ptrtype, 0));
 160                   TREE_THIS_VOLATILE (*basep) = volatilep;
 161                 }
 162               else
 163                 basep = NULL;
 164             }
 165           stream_write_tree (ob, op, true);
 166           /* Restore the original base if we wrapped it inside a MEM_REF.  */
 167           if (basep)
 168             *basep = TREE_OPERAND (TREE_OPERAND (*basep, 0), 0);
 169         }
 170       if (is_gimple_call (stmt))
 171         {
 172           if (gimple_call_internal_p (stmt))
 173             streamer_write_enum (ob->main_stream, internal_fn,
 174                                  IFN_LAST, gimple_call_internal_fn (stmt));
 175           else
 176             stream_write_tree (ob, gimple_call_fntype (stmt), true);
 177         }
 178       break;
 179
 180     case GIMPLE_NOP:
 181     case GIMPLE_PREDICT:
 182       break;
 183
 184     case GIMPLE_TRANSACTION:
 185       {
 186         gimple_transaction trans_stmt = as_a <gimple_transaction> (stmt);
 187         gcc_assert (gimple_transaction_body (trans_stmt) == NULL);
 188         stream_write_tree (ob, gimple_transaction_label (trans_stmt), true);
 189       }
 190       break;
 191
 192     default:
 193       gcc_unreachable ();
 194     }
 195   if (hist)
 196     stream_out_histogram_value (ob, hist);
 197 }
 198
 199
 200 /* Output a basic block BB to the main stream in OB for this FN.  */
 201
 202 void
 203 output_bb (struct output_block *ob, basic_block bb, struct function *fn)
 204 {
 205   gimple_stmt_iterator bsi = gsi_start_bb (bb);
 206
 207   streamer_write_record_start (ob,
 208                                (!gsi_end_p (bsi)) || phi_nodes (bb)
 209                                 ? LTO_bb1
 210                                 : LTO_bb0);
 211
 212   streamer_write_uhwi (ob, bb->index);
 213   streamer_write_gcov_count (ob, bb->count);
 214   streamer_write_hwi (ob, bb->frequency);
 215   streamer_write_hwi (ob, bb->flags);
 216
 217   if (!gsi_end_p (bsi) || phi_nodes (bb))
 218     {
 219       /* Output the statements.  The list of statements is terminated
 220          with a zero.  */
 221       for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi))
 222         {
 223           int region;
 224           gimple stmt = gsi_stmt (bsi);
 225
 226           output_gimple_stmt (ob, stmt);
 227
 228           /* Emit the EH region holding STMT.  */
 229           region = lookup_stmt_eh_lp_fn (fn, stmt);
 230           if (region != 0)
 231             {
 232               streamer_write_record_start (ob, LTO_eh_region);
 233               streamer_write_hwi (ob, region);
 234             }
 235           else
 236             streamer_write_record_start (ob, LTO_null);
 237         }
 238
 239       streamer_write_record_start (ob, LTO_null);
 240
 241       for (gimple_phi_iterator psi = gsi_start_phis (bb);
 242            !gsi_end_p (psi);
 243            gsi_next (&psi))
 244         {
 245           gimple_phi phi = psi.phi ();
 246
 247           /* Only emit PHIs for gimple registers.  PHI nodes for .MEM
 248              will be filled in on reading when the SSA form is
 249              updated.  */
 250           if (!virtual_operand_p (gimple_phi_result (phi)))
 251             output_phi (ob, phi);
 252         }
 253
 254       streamer_write_record_start (ob, LTO_null);
 255     }
 256 }