gdb/testsuite/lib/cache.exp

   1 # Copyright 2012-2019 Free Software Foundation, Inc.
   2
   3 # This program is free software; you can redistribute it and/or modify
   4 # it under the terms of the GNU General Public License as published by
   5 # the Free Software Foundation; either version 3 of the License, or
   6 # (at your option) any later version.
   7 #
   8 # This program is distributed in the hope that it will be useful,
   9 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11 # GNU General Public License for more details.
  12 #
  13 # You should have received a copy of the GNU General Public License
  14 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  15
  16
  17 # The in-memory cache.
  18 array set gdb_data_cache {}
  19
  20 # A helper for gdb_caching_proc that handles the caching.
  21
  22 proc gdb_do_cache {name} {
  23     global gdb_data_cache objdir
  24     global GDB_PARALLEL
  25
  26     # See if some other process wrote the cache file.  Cache value per
  27     # "board" to handle runs with multiple options
  28     # (e.g. unix/{-m32,-64}) correctly.  We use "file join" here
  29     # because we later use this in a real filename.
  30     set cache_name [file join [target_info name] $name]
  31
  32     if {[info exists gdb_data_cache($cache_name)]} {
  33         verbose "$name: returning '$gdb_data_cache($cache_name)' from cache" 2
  34         return $gdb_data_cache($cache_name)
  35     }
  36
  37     if {[info exists GDB_PARALLEL]} {
  38         set cache_filename [make_gdb_parallel_path cache $cache_name]
  39         if {[file exists $cache_filename]} {
  40             set fd [open $cache_filename]
  41             set gdb_data_cache($cache_name) [read -nonewline $fd]
  42             close $fd
  43             verbose "$name: returning '$gdb_data_cache($cache_name)' from file cache" 2
  44             return $gdb_data_cache($cache_name)
  45         }
  46     }
  47
  48     set real_name gdb_real__$name
  49     set gdb_data_cache($cache_name) [uplevel 1 $real_name]
  50
  51     if {[info exists GDB_PARALLEL]} {
  52         verbose "$name: returning '$gdb_data_cache($cache_name)' and writing file" 2
  53         file mkdir [file dirname $cache_filename]
  54         # Make sure to write the results file atomically.
  55         set fd [open $cache_filename.[pid] w]
  56         puts $fd $gdb_data_cache($cache_name)
  57         close $fd
  58         file rename -force -- $cache_filename.[pid] $cache_filename
  59     }
  60     return $gdb_data_cache($cache_name)
  61 }
  62
  63 # Define a new proc named NAME that takes no arguments.  BODY is the
  64 # body of the proc.  The proc will evaluate BODY and cache the
  65 # results, both in memory and, if GDB_PARALLEL is defined, in the
  66 # filesystem for use across invocations of dejagnu.
  67
  68 proc gdb_caching_proc {name body} {
  69     # Define the underlying proc that we'll call.
  70     set real_name gdb_real__$name
  71     proc $real_name {} $body
  72
  73     # Define the advertised proc.
  74     proc $name {} [list gdb_do_cache $name]
  75 }