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# Copyright 2012, 2013 Free Software Foundation, Inc.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# The in-memory cache.
array set gdb_data_cache {}
# A helper for gdb_caching_proc that handles the caching.
proc gdb_do_cache {name} {
global gdb_data_cache objdir
global GDB_PARALLEL
# See if some other process wrote the cache file. Cache value per
# "board" to handle runs with multiple options
# (e.g. unix/{-m32,-64}) correctly. We use "file join" here
# because we later use this in a real filename.
set cache_name [file join [target_info name] $name]
if {[info exists gdb_data_cache($cache_name)]} {
verbose "$name: returning '$gdb_data_cache($cache_name)' from cache" 2
return $gdb_data_cache($cache_name)
}
if {[info exists GDB_PARALLEL]} {
set cache_filename [file join $objdir cache $cache_name]
if {[file exists $cache_filename]} {
set fd [open $cache_filename]
set gdb_data_cache($cache_name) [read -nonewline $fd]
close $fd
verbose "$name: returning '$gdb_data_cache($cache_name)' from file cache" 2
return $gdb_data_cache($cache_name)
}
}
set real_name gdb_real__$name
set gdb_data_cache($cache_name) [uplevel 1 $real_name]
if {[info exists GDB_PARALLEL]} {
verbose "$name: returning '$gdb_data_cache($cache_name)' and writing file" 2
file mkdir [file dirname $cache_filename]
# Make sure to write the results file atomically.
set fd [open $cache_filename.[pid] w]
puts $fd $gdb_data_cache($cache_name)
close $fd
file rename -force -- $cache_filename.[pid] $cache_filename
}
return $gdb_data_cache($cache_name)
}
# Define a new proc named NAME that takes no arguments. BODY is the
# body of the proc. The proc will evaluate BODY and cache the
# results, both in memory and, if GDB_PARALLEL is defined, in the
# filesystem for use across invocations of dejagnu.
proc gdb_caching_proc {name body} {
# Define the underlying proc that we'll call.
set real_name gdb_real__$name
proc $real_name {} $body
# Define the advertised proc.
proc $name {} [list gdb_do_cache $name]
}
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