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, gphi *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,
  84                    gimple_assign_nontemporal_move_p (
  85                      as_a <gassign *> (stmt)),
  86                    1);
  87   bp_pack_value (&bp, gimple_has_volatile_ops (stmt), 1);
  88   hist = gimple_histogram_value (cfun, stmt);
  89   bp_pack_value (&bp, hist != NULL, 1);
  90   bp_pack_var_len_unsigned (&bp, stmt->subcode);
  91
  92   /* Emit location information for the statement.  */
  93   stream_output_location (ob, &bp, LOCATION_LOCUS (gimple_location (stmt)));
  94   streamer_write_bitpack (&bp);
  95
  96   /* Emit the lexical block holding STMT.  */
  97   stream_write_tree (ob, gimple_block (stmt), true);
  98
  99   /* Emit the operands.  */
 100   switch (gimple_code (stmt))
 101     {
 102     case GIMPLE_RESX:
 103       streamer_write_hwi (ob, gimple_resx_region (as_a <gresx *> (stmt)));
 104       break;
 105
 106     case GIMPLE_EH_MUST_NOT_THROW:
 107       stream_write_tree (ob,
 108                          gimple_eh_must_not_throw_fndecl (
 109                            as_a <geh_mnt *> (stmt)),
 110                          true);
 111       break;
 112
 113     case GIMPLE_EH_DISPATCH:
 114       streamer_write_hwi (ob,
 115                           gimple_eh_dispatch_region (
 116                             as_a <geh_dispatch *> (stmt)));
 117       break;
 118
 119     case GIMPLE_ASM:
 120       {
 121         gasm *asm_stmt = as_a <gasm *> (stmt);
 122         streamer_write_uhwi (ob, gimple_asm_ninputs (asm_stmt));
 123         streamer_write_uhwi (ob, gimple_asm_noutputs (asm_stmt));
 124         streamer_write_uhwi (ob, gimple_asm_nclobbers (asm_stmt));
 125         streamer_write_uhwi (ob, gimple_asm_nlabels (asm_stmt));
 126         streamer_write_string (ob, ob->main_stream,
 127                                gimple_asm_string (asm_stmt), true);
 128       }
 129       /* Fallthru  */
 130
 131     case GIMPLE_ASSIGN:
 132     case GIMPLE_CALL:
 133     case GIMPLE_RETURN:
 134     case GIMPLE_SWITCH:
 135     case GIMPLE_LABEL:
 136     case GIMPLE_COND:
 137     case GIMPLE_GOTO:
 138     case GIMPLE_DEBUG:
 139       for (i = 0; i < gimple_num_ops (stmt); i++)
 140         {
 141           tree op = gimple_op (stmt, i);
 142           tree *basep = NULL;
 143           /* Wrap all uses of non-automatic variables inside MEM_REFs
 144              so that we do not have to deal with type mismatches on
 145              merged symbols during IL read in.  The first operand
 146              of GIMPLE_DEBUG must be a decl, not MEM_REF, though.  */
 147           if (op && (i || !is_gimple_debug (stmt)))
 148             {
 149               basep = &op;
 150               if (TREE_CODE (*basep) == ADDR_EXPR)
 151                 basep = &TREE_OPERAND (*basep, 0);
 152               while (handled_component_p (*basep))
 153                 basep = &TREE_OPERAND (*basep, 0);
 154               if (TREE_CODE (*basep) == VAR_DECL
 155                   && !auto_var_in_fn_p (*basep, current_function_decl)
 156                   && !DECL_REGISTER (*basep))
 157                 {
 158                   bool volatilep = TREE_THIS_VOLATILE (*basep);
 159                   tree ptrtype = build_pointer_type (TREE_TYPE (*basep));
 160                   *basep = build2 (MEM_REF, TREE_TYPE (*basep),
 161                                    build1 (ADDR_EXPR, ptrtype, *basep),
 162                                    build_int_cst (ptrtype, 0));
 163                   TREE_THIS_VOLATILE (*basep) = volatilep;
 164                 }
 165               else
 166                 basep = NULL;
 167             }
 168           stream_write_tree (ob, op, true);
 169           /* Restore the original base if we wrapped it inside a MEM_REF.  */
 170           if (basep)
 171             *basep = TREE_OPERAND (TREE_OPERAND (*basep, 0), 0);
 172         }
 173       if (is_gimple_call (stmt))
 174         {
 175           if (gimple_call_internal_p (stmt))
 176             streamer_write_enum (ob->main_stream, internal_fn,
 177                                  IFN_LAST, gimple_call_internal_fn (stmt));
 178           else
 179             stream_write_tree (ob, gimple_call_fntype (stmt), true);
 180         }
 181       break;
 182
 183     case GIMPLE_NOP:
 184     case GIMPLE_PREDICT:
 185       break;
 186
 187     case GIMPLE_TRANSACTION:
 188       {
 189         gtransaction *trans_stmt = as_a <gtransaction *> (stmt);
 190         gcc_assert (gimple_transaction_body (trans_stmt) == NULL);
 191         stream_write_tree (ob, gimple_transaction_label (trans_stmt), true);
 192       }
 193       break;
 194
 195     default:
 196       gcc_unreachable ();
 197     }
 198   if (hist)
 199     stream_out_histogram_value (ob, hist);
 200 }
 201
 202
 203 /* Output a basic block BB to the main stream in OB for this FN.  */
 204
 205 void
 206 output_bb (struct output_block *ob, basic_block bb, struct function *fn)
 207 {
 208   gimple_stmt_iterator bsi = gsi_start_bb (bb);
 209
 210   streamer_write_record_start (ob,
 211                                (!gsi_end_p (bsi)) || phi_nodes (bb)
 212                                 ? LTO_bb1
 213                                 : LTO_bb0);
 214
 215   streamer_write_uhwi (ob, bb->index);
 216   streamer_write_gcov_count (ob, bb->count);
 217   streamer_write_hwi (ob, bb->frequency);
 218   streamer_write_hwi (ob, bb->flags);
 219
 220   if (!gsi_end_p (bsi) || phi_nodes (bb))
 221     {
 222       /* Output the statements.  The list of statements is terminated
 223          with a zero.  */
 224       for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi))
 225         {
 226           int region;
 227           gimple stmt = gsi_stmt (bsi);
 228
 229           output_gimple_stmt (ob, stmt);
 230
 231           /* Emit the EH region holding STMT.  */
 232           region = lookup_stmt_eh_lp_fn (fn, stmt);
 233           if (region != 0)
 234             {
 235               streamer_write_record_start (ob, LTO_eh_region);
 236               streamer_write_hwi (ob, region);
 237             }
 238           else
 239             streamer_write_record_start (ob, LTO_null);
 240         }
 241
 242       streamer_write_record_start (ob, LTO_null);
 243
 244       for (gphi_iterator psi = gsi_start_phis (bb);
 245            !gsi_end_p (psi);
 246            gsi_next (&psi))
 247         {
 248           gphi *phi = psi.phi ();
 249
 250           /* Only emit PHIs for gimple registers.  PHI nodes for .MEM
 251              will be filled in on reading when the SSA form is
 252              updated.  */
 253           if (!virtual_operand_p (gimple_phi_result (phi)))
 254             output_phi (ob, phi);
 255         }
 256
 257       streamer_write_record_start (ob, LTO_null);
 258     }
 259 }