gcc/gimple-streamer-out.c

   1 /* Routines for emitting GIMPLE to a file stream.
   2
   3    Copyright 2011 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       lto_output_location (ob, gimple_phi_arg_location (phi, i));
  47     }
  48 }
  49
  50
  51 /* Emit statement STMT on the main stream of output block OB.  */
  52
  53 static void
  54 output_gimple_stmt (struct output_block *ob, gimple stmt)
  55 {
  56   unsigned i;
  57   enum gimple_code code;
  58   enum LTO_tags tag;
  59   struct bitpack_d bp;
  60
  61   /* Emit identifying tag.  */
  62   code = gimple_code (stmt);
  63   tag = lto_gimple_code_to_tag (code);
  64   streamer_write_record_start (ob, tag);
  65
  66   /* Emit the tuple header.  */
  67   bp = bitpack_create (ob->main_stream);
  68   bp_pack_var_len_unsigned (&bp, gimple_num_ops (stmt));
  69   bp_pack_value (&bp, gimple_no_warning_p (stmt), 1);
  70   if (is_gimple_assign (stmt))
  71     bp_pack_value (&bp, gimple_assign_nontemporal_move_p (stmt), 1);
  72   bp_pack_value (&bp, gimple_has_volatile_ops (stmt), 1);
  73   bp_pack_var_len_unsigned (&bp, stmt->gsbase.subcode);
  74   streamer_write_bitpack (&bp);
  75
  76   /* Emit location information for the statement.  */
  77   lto_output_location (ob, gimple_location (stmt));
  78
  79   /* Emit the lexical block holding STMT.  */
  80   stream_write_tree (ob, gimple_block (stmt), true);
  81
  82   /* Emit the operands.  */
  83   switch (gimple_code (stmt))
  84     {
  85     case GIMPLE_RESX:
  86       streamer_write_hwi (ob, gimple_resx_region (stmt));
  87       break;
  88
  89     case GIMPLE_EH_MUST_NOT_THROW:
  90       stream_write_tree (ob, gimple_eh_must_not_throw_fndecl (stmt), true);
  91       break;
  92
  93     case GIMPLE_EH_DISPATCH:
  94       streamer_write_hwi (ob, gimple_eh_dispatch_region (stmt));
  95       break;
  96
  97     case GIMPLE_ASM:
  98       streamer_write_uhwi (ob, gimple_asm_ninputs (stmt));
  99       streamer_write_uhwi (ob, gimple_asm_noutputs (stmt));
 100       streamer_write_uhwi (ob, gimple_asm_nclobbers (stmt));
 101       streamer_write_uhwi (ob, gimple_asm_nlabels (stmt));
 102       streamer_write_string (ob, ob->main_stream, gimple_asm_string (stmt),
 103                              true);
 104       /* Fallthru  */
 105
 106     case GIMPLE_ASSIGN:
 107     case GIMPLE_CALL:
 108     case GIMPLE_RETURN:
 109     case GIMPLE_SWITCH:
 110     case GIMPLE_LABEL:
 111     case GIMPLE_COND:
 112     case GIMPLE_GOTO:
 113     case GIMPLE_DEBUG:
 114       for (i = 0; i < gimple_num_ops (stmt); i++)
 115         {
 116           tree op = gimple_op (stmt, i);
 117           /* Wrap all uses of non-automatic variables inside MEM_REFs
 118              so that we do not have to deal with type mismatches on
 119              merged symbols during IL read in.  The first operand
 120              of GIMPLE_DEBUG must be a decl, not MEM_REF, though.  */
 121           if (op && (i || !is_gimple_debug (stmt)))
 122             {
 123               tree *basep = &op;
 124               while (handled_component_p (*basep))
 125                 basep = &TREE_OPERAND (*basep, 0);
 126               if (TREE_CODE (*basep) == VAR_DECL
 127                   && !auto_var_in_fn_p (*basep, current_function_decl)
 128                   && !DECL_REGISTER (*basep))
 129                 {
 130                   bool volatilep = TREE_THIS_VOLATILE (*basep);
 131                   *basep = build2 (MEM_REF, TREE_TYPE (*basep),
 132                                    build_fold_addr_expr (*basep),
 133                                    build_int_cst (build_pointer_type
 134                                                   (TREE_TYPE (*basep)), 0));
 135                   TREE_THIS_VOLATILE (*basep) = volatilep;
 136                 }
 137             }
 138           stream_write_tree (ob, op, true);
 139         }
 140       if (is_gimple_call (stmt))
 141         {
 142           if (gimple_call_internal_p (stmt))
 143             streamer_write_enum (ob->main_stream, internal_fn,
 144                                  IFN_LAST, gimple_call_internal_fn (stmt));
 145           else
 146             stream_write_tree (ob, gimple_call_fntype (stmt), true);
 147         }
 148       break;
 149
 150     case GIMPLE_NOP:
 151     case GIMPLE_PREDICT:
 152       break;
 153
 154     case GIMPLE_TRANSACTION:
 155       gcc_assert (gimple_transaction_body (stmt) == NULL);
 156       stream_write_tree (ob, gimple_transaction_label (stmt), true);
 157       break;
 158
 159     default:
 160       gcc_unreachable ();
 161     }
 162 }
 163
 164
 165 /* Output a basic block BB to the main stream in OB for this FN.  */
 166
 167 void
 168 output_bb (struct output_block *ob, basic_block bb, struct function *fn)
 169 {
 170   gimple_stmt_iterator bsi = gsi_start_bb (bb);
 171
 172   streamer_write_record_start (ob,
 173                                (!gsi_end_p (bsi)) || phi_nodes (bb)
 174                                 ? LTO_bb1
 175                                 : LTO_bb0);
 176
 177   streamer_write_uhwi (ob, bb->index);
 178   streamer_write_hwi (ob, bb->count);
 179   streamer_write_hwi (ob, bb->frequency);
 180   streamer_write_hwi (ob, bb->flags);
 181
 182   if (!gsi_end_p (bsi) || phi_nodes (bb))
 183     {
 184       /* Output the statements.  The list of statements is terminated
 185          with a zero.  */
 186       for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi))
 187         {
 188           int region;
 189           gimple stmt = gsi_stmt (bsi);
 190
 191           output_gimple_stmt (ob, stmt);
 192
 193           /* Emit the EH region holding STMT.  */
 194           region = lookup_stmt_eh_lp_fn (fn, stmt);
 195           if (region != 0)
 196             {
 197               streamer_write_record_start (ob, LTO_eh_region);
 198               streamer_write_hwi (ob, region);
 199             }
 200           else
 201             streamer_write_record_start (ob, LTO_null);
 202         }
 203
 204       streamer_write_record_start (ob, LTO_null);
 205
 206       for (bsi = gsi_start_phis (bb); !gsi_end_p (bsi); gsi_next (&bsi))
 207         {
 208           gimple phi = gsi_stmt (bsi);
 209
 210           /* Only emit PHIs for gimple registers.  PHI nodes for .MEM
 211              will be filled in on reading when the SSA form is
 212              updated.  */
 213           if (!virtual_operand_p (gimple_phi_result (phi)))
 214             output_phi (ob, phi);
 215         }
 216
 217       streamer_write_record_start (ob, LTO_null);
 218     }
 219 }