Mercurial > hg > CbC > CbC_gcc
annotate gcc/dbgcnt.def @ 145:1830386684a0
gcc-9.2.0
| author | anatofuz |
|---|---|
| date | Thu, 13 Feb 2020 11:34:05 +0900 |
| parents | 84e7813d76e9 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* This file contains the list of the debug counter for GCC. |
| 145 | 2 Copyright (C) 2006-2020 Free Software Foundation, Inc. |
| 0 | 3 |
| 4 This file is part of GCC. | |
| 5 | |
| 6 GCC is free software; you can redistribute it and/or modify it under | |
| 7 the terms of the GNU General Public License as published by the Free | |
| 8 Software Foundation; either version 3, or (at your option) any later | |
| 9 version. | |
| 10 | |
| 11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
| 12 WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 for more details. | |
| 15 | |
| 16 You should have received a copy of the GNU General Public License | |
| 17 along with GCC; see the file COPYING3. If not see | |
| 18 <http://www.gnu.org/licenses/>. */ | |
| 19 | |
| 20 | |
| 21 /* A debug counter provides you a way to count an event | |
| 22 and return false after the counter has exceeded the threshold | |
| 23 specified by the option. | |
| 24 | |
| 25 What is it used for ? | |
| 26 | |
| 27 This is primarily used to speed up the search for the bad transformation | |
| 28 an optimization pass does. By doing a binary search on N, | |
| 29 you can quickly narrow down to one transformation | |
| 30 which is bad, or which triggers the bad behavior downstream | |
| 31 (usually in the form of the badly generated code). | |
| 32 | |
| 33 How does it work ? | |
| 34 | |
| 35 Every time dbg_cnt(named-counter) is called, | |
| 36 the counter is incremented for the named-counter. | |
| 37 And the incremented value is compared against the threshold (limit) | |
| 38 specified by the option. | |
| 39 dbg_cnt () returns true if it is at or below threshold, and false if above. | |
| 40 | |
| 41 How to add a new one ? | |
| 42 | |
| 43 To add a new counter, simply add an entry below with some descriptive name, | |
| 44 and add call(s) to dbg_cnt(your-counter-name) in appropriate places. | |
| 45 Usually, you want to control at the finest granularity | |
| 46 any particular transformation can happen. | |
| 47 e.g. for each instruction in a dead code elimination, | |
| 48 or for each copy instruction in register coalescing, | |
| 49 or constant-propagation for each insn, | |
| 50 or a block straightening, etc. | |
| 51 See dce.c for an example. With the dbg_cnt () call in dce.c, | |
| 52 now a developer can use -fdbg-cnt=dce:N | |
| 53 to stop doing the dead code elimination after N times. | |
| 54 | |
| 55 How to use it ? | |
| 56 | |
| 57 By default, all limits are UINT_MAX. | |
| 58 Since debug count is unsigned int, <= UINT_MAX returns true always. | |
| 59 i.e. dbg_cnt() returns true always regardless of the counter value | |
| 60 (although it still counts the event). | |
| 61 Use -fdbg-cnt=counter1:N,counter2:M,... | |
| 62 which sets the limit for counter1 to N, and the limit for counter2 to M, etc. | |
| 63 e.g. setting a limit to zero will make dbg_cnt () return false *always*. | |
| 64 | |
| 65 The following shell file can then be used to binary search for | |
| 66 exact transformation that causes the bug. A second shell script | |
| 67 should be written, say "tryTest", which exits with 1 if the | |
| 68 compiled program fails and exits with 0 if the program succeeds. | |
| 69 This shell script should take 1 parameter, the value to be passed | |
| 70 to set the counter of the compilation command in tryTest. Then, | |
| 71 assuming that the following script is called binarySearch, | |
| 72 the command: | |
| 73 | |
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74 binarySearch tryTest |
| 0 | 75 |
| 76 will automatically find the highest value of the counter for which | |
| 77 the program fails. If tryTest never fails, binarySearch will | |
| 78 produce unpredictable results as it will try to find an upper bound | |
| 79 that does not exist. | |
| 80 | |
| 81 When dbgcnt does hits the limit, it writes a comment in the current | |
| 82 dump_file of the form: | |
| 83 | |
| 84 ***dbgcnt: limit reached for %s.*** | |
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85 |
| 0 | 86 Assuming that the dump file is logging the analysis/transformations |
| 87 it is making, this pinpoints the exact position in the log file | |
| 88 where the problem transformation is being logged. | |
| 89 | |
| 90 ===================================== | |
| 91 #!/bin/bash | |
| 92 | |
| 93 while getopts "l:u:i:" opt | |
| 94 do | |
| 95 case $opt in | |
| 96 l) lb="$OPTARG";; | |
| 97 u) ub="$OPTARG";; | |
| 98 i) init="$OPTARG";; | |
| 99 ?) usage; exit 3;; | |
| 100 esac | |
| 101 done | |
| 102 | |
| 103 shift $(($OPTIND - 1)) | |
| 104 echo $@ | |
| 105 cmd=${1+"${@}"} | |
| 106 | |
| 107 lb=${lb:=0} | |
| 108 init=${init:=100} | |
| 109 | |
| 110 $cmd $lb | |
| 111 lb_val=$? | |
| 112 if [ -z "$ub" ]; then | |
| 113 # find the upper bound | |
| 114 ub=$(($init + $lb)) | |
| 115 true | |
| 116 while [ $? -eq $lb_val ]; do | |
| 117 ub=$(($ub * 10)) | |
| 118 #ub=`expr $ub \* 10` | |
| 119 $cmd $ub | |
| 120 done | |
| 121 fi | |
| 122 | |
| 123 echo command: $cmd | |
| 124 | |
| 125 true | |
| 126 while [ `expr $ub - $lb` -gt 1 ]; do | |
| 127 try=$(($lb + ( $ub - $lb ) / 2)) | |
| 128 $cmd $try | |
| 129 if [ $? -eq $lb_val ]; then | |
| 130 lb=$try | |
| 131 else | |
| 132 ub=$try | |
| 133 fi | |
| 134 done | |
| 135 | |
| 136 echo lbound: $lb | |
| 137 echo ubound: $ub | |
| 138 | |
| 139 ===================================== | |
| 140 | |
| 141 */ | |
| 142 | |
| 145 | 143 /* Debug counter definitions. |
| 144 Please keep the list sorted in alphabetic order. */ | |
| 111 | 145 DEBUG_COUNTER (asan_use_after_scope) |
| 0 | 146 DEBUG_COUNTER (auto_inc_dec) |
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147 DEBUG_COUNTER (ccp) |
| 0 | 148 DEBUG_COUNTER (cfg_cleanup) |
| 111 | 149 DEBUG_COUNTER (cprop) |
| 0 | 150 DEBUG_COUNTER (cse2_move2add) |
| 151 DEBUG_COUNTER (dce) | |
| 152 DEBUG_COUNTER (dce_fast) | |
| 153 DEBUG_COUNTER (dce_ud) | |
| 154 DEBUG_COUNTER (delete_trivial_dead) | |
| 111 | 155 DEBUG_COUNTER (devirt) |
| 0 | 156 DEBUG_COUNTER (df_byte_scan) |
| 145 | 157 DEBUG_COUNTER (dom_unreachable_edges) |
| 0 | 158 DEBUG_COUNTER (dse) |
| 159 DEBUG_COUNTER (dse1) | |
| 160 DEBUG_COUNTER (dse2) | |
| 161 DEBUG_COUNTER (gcse2_delete) | |
| 145 | 162 DEBUG_COUNTER (gimple_unroll) |
| 0 | 163 DEBUG_COUNTER (global_alloc_at_func) |
| 164 DEBUG_COUNTER (global_alloc_at_reg) | |
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165 DEBUG_COUNTER (graphite_scop) |
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166 DEBUG_COUNTER (hoist) |
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parents:
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changeset
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167 DEBUG_COUNTER (hoist_insn) |
| 0 | 168 DEBUG_COUNTER (ia64_sched2) |
| 111 | 169 DEBUG_COUNTER (if_after_combine) |
| 170 DEBUG_COUNTER (if_after_reload) | |
| 0 | 171 DEBUG_COUNTER (if_conversion) |
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f6334be47118
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nobuyasu <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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diff
changeset
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172 DEBUG_COUNTER (if_conversion_tree) |
| 145 | 173 DEBUG_COUNTER (ipa_sra_params) |
| 174 DEBUG_COUNTER (ipa_sra_retvalues) | |
| 111 | 175 DEBUG_COUNTER (ira_move) |
| 145 | 176 DEBUG_COUNTER (ivopts_loop) |
| 0 | 177 DEBUG_COUNTER (local_alloc_for_sched) |
| 145 | 178 DEBUG_COUNTER (match) |
| 111 | 179 DEBUG_COUNTER (merged_ipa_icf) |
| 0 | 180 DEBUG_COUNTER (postreload_cse) |
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181 DEBUG_COUNTER (pre) |
| 0 | 182 DEBUG_COUNTER (pre_insn) |
| 111 | 183 DEBUG_COUNTER (prefetch) |
| 184 DEBUG_COUNTER (registered_jump_thread) | |
| 0 | 185 DEBUG_COUNTER (sched2_func) |
| 186 DEBUG_COUNTER (sched_block) | |
| 111 | 187 DEBUG_COUNTER (sched_breakdep) |
| 0 | 188 DEBUG_COUNTER (sched_func) |
| 189 DEBUG_COUNTER (sched_insn) | |
| 190 DEBUG_COUNTER (sched_region) | |
| 191 DEBUG_COUNTER (sel_sched_cnt) | |
| 111 | 192 DEBUG_COUNTER (sel_sched_insn_cnt) |
| 0 | 193 DEBUG_COUNTER (sel_sched_region_cnt) |
| 194 DEBUG_COUNTER (sms_sched_loop) | |
| 111 | 195 DEBUG_COUNTER (split_for_sched2) |
| 145 | 196 DEBUG_COUNTER (store_merging) |
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parents:
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197 DEBUG_COUNTER (store_motion) |
| 111 | 198 DEBUG_COUNTER (stv_conversion) |
| 0 | 199 DEBUG_COUNTER (tail_call) |
| 145 | 200 DEBUG_COUNTER (tree_sra) |
| 111 | 201 DEBUG_COUNTER (treepre_insert) |
| 202 DEBUG_COUNTER (vect_loop) | |
| 203 DEBUG_COUNTER (vect_slp) |