1# Copyright 2012-2016 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. 18array set gdb_data_cache {} 19 20# A helper for gdb_caching_proc that handles the caching. 21 22proc 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 68proc 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} 76