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      1 #   Copyright 2018-2024 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 # When caching a proc using gdb_caching_proc, it will become less likely to
     17 # be executed, and consequently it's going to be harder to detect that the
     18 # proc is racy.  OTOH, in general the proc is easy to rerun.  So, run all
     19 # uncached gdb_caching_procs a number of times and detect inconsistent results.
     20 # The purpose of caching is to reduce runtime, so rerunning is somewhat
     21 # counter-productive in that aspect, but it's better than uncached, because the
     22 # number of reruns is constant-bounded, and the increase in runtime is bound to
     23 # this test-case, and could be disabled on slow targets.
     24 
     25 # Test gdb_caching_proc NAME
     26 proc test_proc { name } {
     27     set real_name gdb_real__$name
     28 
     29     set resultlist [list]
     30 
     31     with_test_prefix initial {
     32 	set first [gdb_do_cache_wrap $real_name]
     33     }
     34     lappend resultlist $first
     35 
     36     # Ten repetitions was enough to trigger target_supports_scheduler_locking,
     37     # and costs about 20 seconds on an i7-6600U.
     38     set repeat 10
     39 
     40     set racy 0
     41     for {set i 0} {$i < $repeat} {incr i} {
     42 	with_test_prefix $i {
     43 	    set rerun [gdb_do_cache_wrap $real_name]
     44 	}
     45 	lappend resultlist $rerun
     46 	if { $rerun != $first } {
     47 	    set racy 1
     48 	}
     49     }
     50 
     51     if { $racy  == 0 } {
     52 	pass "consistency"
     53     } else {
     54 	fail "consistency"
     55 	verbose -log "$name: $resultlist"
     56     }
     57 }
     58 
     59 # Test gdb_caching_procs in FILE
     60 proc test_file { file } {
     61     upvar obj obj
     62     set procnames [list]
     63 
     64     set fp [open $file]
     65     while { [gets $fp line] >= 0 } {
     66 	if [regexp -- "^gdb_caching_proc \[ \t\]*(\[^ \t\]*)" $line \
     67 		match procname] {
     68 	    lappend procnames $procname
     69 	}
     70     }
     71     close $fp
     72 
     73     if { [llength $procnames] == 0 } {
     74 	return
     75     }
     76 
     77     if { [file tail $file] == "gdb.exp" } {
     78 	# Already loaded
     79     } else {
     80 	load_lib [file tail $file]
     81     }
     82 
     83     foreach procname $procnames {
     84 	if { [info args $procname] != "" } {
     85 	    # With args.
     86 	    continue
     87 	}
     88 	with_test_prefix $procname {
     89 	    switch $procname {
     90 		"is_address_zero_readable" { set setup_gdb 1 }
     91 		"target_is_gdbserver" { set setup_gdb 1 }
     92 		"supports_memtag" { set setup_gdb 1 }
     93 		"have_native_target" { set setup_gdb 1 }
     94 		default {set setup_gdb 0 }
     95 	    }
     96 
     97 	    if { $setup_gdb } {
     98 		clean_restart $obj
     99 	    }
    100 
    101 	    test_proc $procname
    102 
    103 	    gdb_exit
    104 	}
    105     }
    106 }
    107 
    108 # Init
    109 set me "gdb_caching_proc"
    110 set src { int main() { return 0; } }
    111 if { ![gdb_simple_compile $me $src executable] } {
    112     return 0
    113 }
    114 
    115 # Test gdb_caching_procs in gdb/testsuite/lib/*.exp
    116 set files [eval glob -types f $srcdir/lib/*.exp]
    117 set files [lsort $files]
    118 foreach file $files {
    119     test_file $file
    120 }
    121 
    122 # Cleanup
    123 remote_file build delete $obj
    124