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111
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1 /* Print RTL functions for GCC.
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145
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2 Copyright (C) 2016-2020 Free Software Foundation, Inc.
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111
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify it under
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7 the terms of the GNU General Public License as published by the Free
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8 Software Foundation; either version 3, or (at your option) any later
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9 version.
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10
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11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #include "config.h"
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21 #include "system.h"
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22 #include "coretypes.h"
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23 #include "tm.h"
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24 #include "rtl.h"
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25 #include "alias.h"
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26 #include "tree.h"
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27 #include "flags.h"
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28 #include "predict.h"
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29 #include "function.h"
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30 #include "basic-block.h"
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31 #include "print-rtl.h"
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32 #include "langhooks.h"
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33 #include "memmodel.h"
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34 #include "emit-rtl.h"
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35 #include "varasm.h"
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36
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37 /* Print an "(edge-from)" or "(edge-to)" directive describing E
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38 to OUTFILE. */
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39
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40 static void
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41 print_edge (FILE *outfile, edge e, bool from)
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42 {
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43 fprintf (outfile, " (%s ", from ? "edge-from" : "edge-to");
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44 basic_block bb = from ? e->src : e->dest;
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45 gcc_assert (bb);
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46 switch (bb->index)
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47 {
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48 case ENTRY_BLOCK:
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49 fprintf (outfile, "entry");
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50 break;
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51 case EXIT_BLOCK:
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52 fprintf (outfile, "exit");
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53 break;
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54 default:
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55 fprintf (outfile, "%i", bb->index);
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56 break;
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57 }
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58
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59 /* Express edge flags as a string with " | " separator.
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60 e.g. (flags "FALLTHRU | DFS_BACK"). */
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61 if (e->flags)
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62 {
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63 fprintf (outfile, " (flags \"");
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64 bool seen_flag = false;
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65 #define DEF_EDGE_FLAG(NAME,IDX) \
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66 do { \
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67 if (e->flags & EDGE_##NAME) \
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68 { \
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69 if (seen_flag) \
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70 fprintf (outfile, " | "); \
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71 fprintf (outfile, "%s", (#NAME)); \
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72 seen_flag = true; \
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73 } \
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74 } while (0);
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75 #include "cfg-flags.def"
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76 #undef DEF_EDGE_FLAG
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77
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78 fprintf (outfile, "\")");
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79 }
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80
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81 fprintf (outfile, ")\n");
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82 }
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83
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84 /* If BB is non-NULL, print the start of a "(block)" directive for it
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85 to OUTFILE, otherwise do nothing. */
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86
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87 static void
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88 begin_any_block (FILE *outfile, basic_block bb)
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89 {
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90 if (!bb)
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91 return;
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92
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93 edge e;
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94 edge_iterator ei;
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95
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96 fprintf (outfile, " (block %i\n", bb->index);
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97 FOR_EACH_EDGE (e, ei, bb->preds)
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98 print_edge (outfile, e, true);
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99 }
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100
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101 /* If BB is non-NULL, print the end of a "(block)" directive for it
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102 to OUTFILE, otherwise do nothing. */
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103
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104 static void
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105 end_any_block (FILE *outfile, basic_block bb)
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106 {
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107 if (!bb)
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108 return;
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109
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110 edge e;
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111 edge_iterator ei;
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112
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113 FOR_EACH_EDGE (e, ei, bb->succs)
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114 print_edge (outfile, e, false);
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115 fprintf (outfile, " ) ;; block %i\n", bb->index);
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116 }
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117
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118 /* Determine if INSN is of a kind that can have a basic block. */
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119
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120 static bool
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121 can_have_basic_block_p (const rtx_insn *insn)
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122 {
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123 rtx_code code = GET_CODE (insn);
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124 if (code == BARRIER)
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125 return false;
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126 gcc_assert (GET_RTX_FORMAT (code)[2] == 'B');
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127 return true;
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128 }
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129
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130 /* Subroutine of print_param. Write the name of ARG, if any, to OUTFILE. */
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131
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132 static void
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133 print_any_param_name (FILE *outfile, tree arg)
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134 {
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135 if (DECL_NAME (arg))
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136 fprintf (outfile, " \"%s\"", IDENTIFIER_POINTER (DECL_NAME (arg)));
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137 }
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138
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139 /* Print a "(param)" directive for ARG to OUTFILE. */
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140
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141 static void
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142 print_param (FILE *outfile, rtx_writer &w, tree arg)
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143 {
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144 fprintf (outfile, " (param");
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145 print_any_param_name (outfile, arg);
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146 fprintf (outfile, "\n");
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147
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148 /* Print the value of DECL_RTL (without lazy-evaluation). */
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149 fprintf (outfile, " (DECL_RTL ");
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150 w.print_rtx (DECL_RTL_IF_SET (arg));
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151 w.finish_directive ();
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152
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153 /* Print DECL_INCOMING_RTL. */
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154 fprintf (outfile, " (DECL_RTL_INCOMING ");
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155 w.print_rtx (DECL_INCOMING_RTL (arg));
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156 fprintf (outfile, ")");
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157
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158 w.finish_directive ();
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159 }
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160
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161 /* Write FN to OUTFILE in a form suitable for parsing, with indentation
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162 and comments to make the structure easy for a human to grok. Track
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163 the basic blocks of insns in the chain, wrapping those that are within
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164 blocks within "(block)" directives.
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165
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166 If COMPACT, then instructions are printed in a compact form:
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167 - INSN_UIDs are omitted, except for jumps and CODE_LABELs,
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168 - INSN_CODEs are omitted,
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169 - register numbers are omitted for hard and virtual regs, and
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170 non-virtual pseudos are offset relative to the first such reg, and
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171 printed with a '%' sigil e.g. "%0" for (LAST_VIRTUAL_REGISTER + 1),
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172 - insn names are prefixed with "c" (e.g. "cinsn", "cnote", etc)
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173
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174 Example output (with COMPACT==true):
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175
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176 (function "times_two"
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177 (param "i"
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178 (DECL_RTL (mem/c:SI (plus:DI (reg/f:DI virtual-stack-vars)
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179 (const_int -4)) [1 i+0 S4 A32]))
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180 (DECL_RTL_INCOMING (reg:SI di [ i ])))
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181 (insn-chain
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182 (cnote 1 NOTE_INSN_DELETED)
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183 (block 2
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184 (edge-from entry (flags "FALLTHRU"))
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185 (cnote 4 [bb 2] NOTE_INSN_BASIC_BLOCK)
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186 (cinsn 2 (set (mem/c:SI (plus:DI (reg/f:DI virtual-stack-vars)
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187 (const_int -4)) [1 i+0 S4 A32])
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188 (reg:SI di [ i ])) "t.c":2)
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189 (cnote 3 NOTE_INSN_FUNCTION_BEG)
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190 (cinsn 6 (set (reg:SI <2>)
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191 (mem/c:SI (plus:DI (reg/f:DI virtual-stack-vars)
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192 (const_int -4)) [1 i+0 S4 A32])) "t.c":3)
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193 (cinsn 7 (parallel [
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194 (set (reg:SI <0> [ _2 ])
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195 (ashift:SI (reg:SI <2>)
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196 (const_int 1)))
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197 (clobber (reg:CC flags))
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198 ]) "t.c":3
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199 (expr_list:REG_EQUAL (ashift:SI (mem/c:SI (plus:DI (reg/f:DI virtual-stack-vars)
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200 (const_int -4)) [1 i+0 S4 A32])
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201 (const_int 1))))
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202 (cinsn 10 (set (reg:SI <1> [ <retval> ])
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203 (reg:SI <0> [ _2 ])) "t.c":3)
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204 (cinsn 14 (set (reg/i:SI ax)
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205 (reg:SI <1> [ <retval> ])) "t.c":4)
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206 (cinsn 15 (use (reg/i:SI ax)) "t.c":4)
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207 (edge-to exit (flags "FALLTHRU"))
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208 ) ;; block 2
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209 ) ;; insn-chain
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210 (crtl
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211 (return_rtx
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212 (reg/i:SI ax)
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213 ) ;; return_rtx
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214 ) ;; crtl
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215 ) ;; function "times_two"
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216 */
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217
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218 DEBUG_FUNCTION void
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219 print_rtx_function (FILE *outfile, function *fn, bool compact)
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220 {
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221 rtx_reuse_manager r;
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222 rtx_writer w (outfile, 0, false, compact, &r);
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223
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224 /* Support "reuse_rtx" in the dump. */
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225 for (rtx_insn *insn = get_insns (); insn; insn = NEXT_INSN (insn))
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226 r.preprocess (insn);
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227
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228 tree fdecl = fn->decl;
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229
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230 const char *dname = lang_hooks.decl_printable_name (fdecl, 1);
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231
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232 fprintf (outfile, "(function \"%s\"\n", dname);
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233
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234 /* Params. */
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235 for (tree arg = DECL_ARGUMENTS (fdecl); arg; arg = DECL_CHAIN (arg))
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236 print_param (outfile, w, arg);
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237
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238 /* The instruction chain. */
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239 fprintf (outfile, " (insn-chain\n");
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240 basic_block curr_bb = NULL;
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241 for (rtx_insn *insn = get_insns (); insn; insn = NEXT_INSN (insn))
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242 {
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243 basic_block insn_bb;
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244 if (can_have_basic_block_p (insn))
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245 insn_bb = BLOCK_FOR_INSN (insn);
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246 else
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247 insn_bb = NULL;
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248 if (curr_bb != insn_bb)
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249 {
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250 end_any_block (outfile, curr_bb);
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251 curr_bb = insn_bb;
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252 begin_any_block (outfile, curr_bb);
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253 }
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254 w.print_rtl_single_with_indent (insn, curr_bb ? 6 : 4);
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255 }
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256 end_any_block (outfile, curr_bb);
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257 fprintf (outfile, " ) ;; insn-chain\n");
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258
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259 /* Additional RTL state. */
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260 fprintf (outfile, " (crtl\n");
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261 fprintf (outfile, " (return_rtx \n");
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262 w.print_rtl_single_with_indent (crtl->return_rtx, 6);
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263 fprintf (outfile, " ) ;; return_rtx\n");
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264 fprintf (outfile, " ) ;; crtl\n");
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265
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266 fprintf (outfile, ") ;; function \"%s\"\n", dname);
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267 }
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