gdbsupport/btrace-common.cc

   1 /* Copyright (C) 2014-2024 Free Software Foundation, Inc.
   2
   3    Contributed by Intel Corp. <markus.t.metzger@intel.com>
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "common-defs.h"
  21 #include "btrace-common.h"
  22
  23
  24 /* See btrace-common.h.  */
  25
  26 const char *
  27 btrace_format_string (enum btrace_format format)
  28 {
  29   switch (format)
  30     {
  31     case BTRACE_FORMAT_NONE:
  32       return _("No or unknown format");
  33
  34     case BTRACE_FORMAT_BTS:
  35       return _("Branch Trace Store");
  36
  37     case BTRACE_FORMAT_PT:
  38       return _("Intel Processor Trace");
  39     }
  40
  41   internal_error (_("Unknown branch trace format"));
  42 }
  43
  44 /* See btrace-common.h.  */
  45
  46 const char *
  47 btrace_format_short_string (enum btrace_format format)
  48 {
  49   switch (format)
  50     {
  51     case BTRACE_FORMAT_NONE:
  52       return "unknown";
  53
  54     case BTRACE_FORMAT_BTS:
  55       return "bts";
  56
  57     case BTRACE_FORMAT_PT:
  58       return "pt";
  59     }
  60
  61   internal_error (_("Unknown branch trace format"));
  62 }
  63
  64 /* See btrace-common.h.  */
  65
  66 void
  67 btrace_data::fini ()
  68 {
  69   switch (format)
  70     {
  71     case BTRACE_FORMAT_NONE:
  72       /* Nothing to do.  */
  73       return;
  74
  75     case BTRACE_FORMAT_BTS:
  76       delete variant.bts.blocks;
  77       variant.bts.blocks = nullptr;
  78       return;
  79
  80     case BTRACE_FORMAT_PT:
  81       xfree (variant.pt.data);
  82       return;
  83     }
  84
  85   internal_error (_("Unkown branch trace format."));
  86 }
  87
  88 /* See btrace-common.h.  */
  89
  90 bool
  91 btrace_data::empty () const
  92 {
  93   switch (format)
  94     {
  95     case BTRACE_FORMAT_NONE:
  96       return true;
  97
  98     case BTRACE_FORMAT_BTS:
  99       return variant.bts.blocks->empty ();
 100
 101     case BTRACE_FORMAT_PT:
 102       return (variant.pt.size == 0);
 103     }
 104
 105   internal_error (_("Unkown branch trace format."));
 106 }
 107
 108 /* See btrace-common.h.  */
 109
 110 void
 111 btrace_data::clear ()
 112 {
 113   fini ();
 114   format = BTRACE_FORMAT_NONE;
 115 }
 116
 117 /* See btrace-common.h.  */
 118
 119 int
 120 btrace_data_append (struct btrace_data *dst,
 121                     const struct btrace_data *src)
 122 {
 123   switch (src->format)
 124     {
 125     case BTRACE_FORMAT_NONE:
 126       return 0;
 127
 128     case BTRACE_FORMAT_BTS:
 129       switch (dst->format)
 130         {
 131         default:
 132           return -1;
 133
 134         case BTRACE_FORMAT_NONE:
 135           dst->format = BTRACE_FORMAT_BTS;
 136           dst->variant.bts.blocks = new std::vector<btrace_block>;
 137           [[fallthrough]];
 138         case BTRACE_FORMAT_BTS:
 139           {
 140             unsigned int blk;
 141
 142             /* We copy blocks in reverse order to have the oldest block at
 143                index zero.  */
 144             blk = src->variant.bts.blocks->size ();
 145             while (blk != 0)
 146               {
 147                 const btrace_block &block
 148                   = src->variant.bts.blocks->at (--blk);
 149                 dst->variant.bts.blocks->push_back (block);
 150               }
 151           }
 152         }
 153       return 0;
 154
 155     case BTRACE_FORMAT_PT:
 156       switch (dst->format)
 157         {
 158         default:
 159           return -1;
 160
 161         case BTRACE_FORMAT_NONE:
 162           dst->format = BTRACE_FORMAT_PT;
 163           dst->variant.pt.data = NULL;
 164           dst->variant.pt.size = 0;
 165           [[fallthrough]];
 166         case BTRACE_FORMAT_PT:
 167           {
 168             gdb_byte *data;
 169             size_t size;
 170
 171             size = src->variant.pt.size + dst->variant.pt.size;
 172             data = (gdb_byte *) xmalloc (size);
 173
 174             if (dst->variant.pt.size > 0)
 175               memcpy (data, dst->variant.pt.data, dst->variant.pt.size);
 176             memcpy (data + dst->variant.pt.size, src->variant.pt.data,
 177                     src->variant.pt.size);
 178
 179             xfree (dst->variant.pt.data);
 180
 181             dst->variant.pt.data = data;
 182             dst->variant.pt.size = size;
 183           }
 184         }
 185       return 0;
 186     }
 187
 188   internal_error (_("Unkown branch trace format."));
 189 }