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111
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1 /* Routines for emitting GIMPLE to a file stream.
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2
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3 Copyright (C) 2011-2017 Free Software Foundation, Inc.
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4 Contributed by Diego Novillo <dnovillo@google.com>
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5
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6 This file is part of GCC.
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7
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8 GCC is free software; you can redistribute it and/or modify it under
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9 the terms of the GNU General Public License as published by the Free
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10 Software Foundation; either version 3, or (at your option) any later
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11 version.
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12
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13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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16 for more details.
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17
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18 You should have received a copy of the GNU General Public License
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19 along with GCC; see the file COPYING3. If not see
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20 <http://www.gnu.org/licenses/>. */
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21
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22 #include "config.h"
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23 #include "system.h"
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24 #include "coretypes.h"
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25 #include "backend.h"
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26 #include "tree.h"
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27 #include "gimple.h"
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28 #include "gimple-ssa.h"
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29 #include "gimple-streamer.h"
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30 #include "tree-eh.h"
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31 #include "gimple-iterator.h"
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32 #include "cgraph.h"
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33 #include "value-prof.h"
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34
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35 /* Output PHI function PHI to the main stream in OB. */
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36
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37 static void
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38 output_phi (struct output_block *ob, gphi *phi)
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39 {
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40 unsigned i, len = gimple_phi_num_args (phi);
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41
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42 streamer_write_record_start (ob, lto_gimple_code_to_tag (GIMPLE_PHI));
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43 streamer_write_uhwi (ob, SSA_NAME_VERSION (PHI_RESULT (phi)));
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44
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45 for (i = 0; i < len; i++)
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46 {
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47 stream_write_tree (ob, gimple_phi_arg_def (phi, i), true);
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48 streamer_write_uhwi (ob, gimple_phi_arg_edge (phi, i)->src->index);
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49 bitpack_d bp = bitpack_create (ob->main_stream);
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50 stream_output_location (ob, &bp, gimple_phi_arg_location (phi, i));
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51 streamer_write_bitpack (&bp);
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52 }
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53 }
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54
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55
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56 /* Emit statement STMT on the main stream of output block OB. */
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57
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58 static void
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59 output_gimple_stmt (struct output_block *ob, gimple *stmt)
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60 {
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61 unsigned i;
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62 enum gimple_code code;
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63 enum LTO_tags tag;
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64 struct bitpack_d bp;
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65 histogram_value hist;
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66
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67 /* Emit identifying tag. */
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68 code = gimple_code (stmt);
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69 tag = lto_gimple_code_to_tag (code);
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70 streamer_write_record_start (ob, tag);
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71
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72 /* Emit the tuple header. */
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73 bp = bitpack_create (ob->main_stream);
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74 bp_pack_var_len_unsigned (&bp, gimple_num_ops (stmt));
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75 bp_pack_value (&bp, gimple_no_warning_p (stmt), 1);
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76 if (is_gimple_assign (stmt))
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77 bp_pack_value (&bp,
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78 gimple_assign_nontemporal_move_p (
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79 as_a <gassign *> (stmt)),
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80 1);
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81 bp_pack_value (&bp, gimple_has_volatile_ops (stmt), 1);
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82 hist = gimple_histogram_value (cfun, stmt);
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83 bp_pack_value (&bp, hist != NULL, 1);
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84 bp_pack_var_len_unsigned (&bp, stmt->subcode);
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85
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86 /* Emit location information for the statement. */
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87 stream_output_location (ob, &bp, LOCATION_LOCUS (gimple_location (stmt)));
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88 streamer_write_bitpack (&bp);
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89
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90 /* Emit the lexical block holding STMT. */
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91 stream_write_tree (ob, gimple_block (stmt), true);
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92
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93 /* Emit the operands. */
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94 switch (gimple_code (stmt))
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95 {
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96 case GIMPLE_RESX:
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97 streamer_write_hwi (ob, gimple_resx_region (as_a <gresx *> (stmt)));
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98 break;
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99
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100 case GIMPLE_EH_MUST_NOT_THROW:
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101 stream_write_tree (ob,
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102 gimple_eh_must_not_throw_fndecl (
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103 as_a <geh_mnt *> (stmt)),
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104 true);
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105 break;
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106
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107 case GIMPLE_EH_DISPATCH:
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108 streamer_write_hwi (ob,
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109 gimple_eh_dispatch_region (
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110 as_a <geh_dispatch *> (stmt)));
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111 break;
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112
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113 case GIMPLE_ASM:
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114 {
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115 gasm *asm_stmt = as_a <gasm *> (stmt);
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116 streamer_write_uhwi (ob, gimple_asm_ninputs (asm_stmt));
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117 streamer_write_uhwi (ob, gimple_asm_noutputs (asm_stmt));
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118 streamer_write_uhwi (ob, gimple_asm_nclobbers (asm_stmt));
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119 streamer_write_uhwi (ob, gimple_asm_nlabels (asm_stmt));
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120 streamer_write_string (ob, ob->main_stream,
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121 gimple_asm_string (asm_stmt), true);
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122 }
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123 /* Fallthru */
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124
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125 case GIMPLE_ASSIGN:
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126 case GIMPLE_CALL:
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127 case GIMPLE_RETURN:
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128 case GIMPLE_SWITCH:
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129 case GIMPLE_LABEL:
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130 case GIMPLE_COND:
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131 case GIMPLE_GOTO:
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132 case GIMPLE_DEBUG:
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133 for (i = 0; i < gimple_num_ops (stmt); i++)
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134 {
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135 tree op = gimple_op (stmt, i);
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136 tree *basep = NULL;
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137 /* Wrap all uses of non-automatic variables inside MEM_REFs
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138 so that we do not have to deal with type mismatches on
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139 merged symbols during IL read in. The first operand
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140 of GIMPLE_DEBUG must be a decl, not MEM_REF, though. */
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141 if (op && (i || !is_gimple_debug (stmt)))
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142 {
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143 basep = &op;
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144 if (TREE_CODE (*basep) == ADDR_EXPR)
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145 basep = &TREE_OPERAND (*basep, 0);
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146 while (handled_component_p (*basep))
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147 basep = &TREE_OPERAND (*basep, 0);
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148 if (VAR_P (*basep)
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149 && !auto_var_in_fn_p (*basep, current_function_decl)
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150 && !DECL_REGISTER (*basep))
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151 {
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152 bool volatilep = TREE_THIS_VOLATILE (*basep);
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153 tree ptrtype = build_pointer_type (TREE_TYPE (*basep));
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154 *basep = build2 (MEM_REF, TREE_TYPE (*basep),
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155 build1 (ADDR_EXPR, ptrtype, *basep),
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156 build_int_cst (ptrtype, 0));
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157 TREE_THIS_VOLATILE (*basep) = volatilep;
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158 }
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159 else
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160 basep = NULL;
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161 }
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162 stream_write_tree (ob, op, true);
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163 /* Restore the original base if we wrapped it inside a MEM_REF. */
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164 if (basep)
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165 *basep = TREE_OPERAND (TREE_OPERAND (*basep, 0), 0);
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166 }
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167 if (is_gimple_call (stmt))
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168 {
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169 if (gimple_call_internal_p (stmt))
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170 streamer_write_enum (ob->main_stream, internal_fn,
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171 IFN_LAST, gimple_call_internal_fn (stmt));
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172 else
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173 stream_write_tree (ob, gimple_call_fntype (stmt), true);
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174 }
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175 break;
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176
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177 case GIMPLE_NOP:
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178 case GIMPLE_PREDICT:
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179 break;
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180
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181 case GIMPLE_TRANSACTION:
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182 {
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183 gtransaction *txn = as_a <gtransaction *> (stmt);
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184 gcc_assert (gimple_transaction_body (txn) == NULL);
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185 stream_write_tree (ob, gimple_transaction_label_norm (txn), true);
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186 stream_write_tree (ob, gimple_transaction_label_uninst (txn), true);
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187 stream_write_tree (ob, gimple_transaction_label_over (txn), true);
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188 }
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189 break;
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190
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191 default:
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192 gcc_unreachable ();
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193 }
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194 if (hist)
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195 stream_out_histogram_value (ob, hist);
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196 }
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197
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198
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199 /* Output a basic block BB to the main stream in OB for this FN. */
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200
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201 void
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202 output_bb (struct output_block *ob, basic_block bb, struct function *fn)
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203 {
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204 gimple_stmt_iterator bsi = gsi_start_bb (bb);
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205
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206 streamer_write_record_start (ob,
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207 (!gsi_end_p (bsi)) || phi_nodes (bb)
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208 ? LTO_bb1
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209 : LTO_bb0);
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210
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211 streamer_write_uhwi (ob, bb->index);
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212 bb->count.stream_out (ob);
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213 streamer_write_hwi (ob, bb->frequency);
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214 streamer_write_hwi (ob, bb->flags);
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215
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216 if (!gsi_end_p (bsi) || phi_nodes (bb))
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217 {
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218 /* Output the statements. The list of statements is terminated
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219 with a zero. */
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220 for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi))
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221 {
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222 int region;
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223 gimple *stmt = gsi_stmt (bsi);
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224
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225 output_gimple_stmt (ob, stmt);
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226
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227 /* Emit the EH region holding STMT. */
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228 region = lookup_stmt_eh_lp_fn (fn, stmt);
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229 if (region != 0)
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230 {
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231 streamer_write_record_start (ob, LTO_eh_region);
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232 streamer_write_hwi (ob, region);
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233 }
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234 else
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235 streamer_write_record_start (ob, LTO_null);
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236 }
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237
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238 streamer_write_record_start (ob, LTO_null);
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239
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240 for (gphi_iterator psi = gsi_start_phis (bb);
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241 !gsi_end_p (psi);
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242 gsi_next (&psi))
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243 {
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244 gphi *phi = psi.phi ();
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245
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246 /* Only emit PHIs for gimple registers. PHI nodes for .MEM
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247 will be filled in on reading when the SSA form is
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248 updated. */
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249 if (!virtual_operand_p (gimple_phi_result (phi)))
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250 output_phi (ob, phi);
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251 }
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252
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253 streamer_write_record_start (ob, LTO_null);
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254 }
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255 }
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