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Introduce save_vars, a testsuite proc for safely manipulating globals 

gdb/testsuite/ChangeLog:

	* lib/gdb.exp (save_vars): New proc.
This commit is contained in:
Patrick Palka 2015-06-18 21:33:26 -04:00
parent 87ad46af87
commit abe8e6075b
2 changed files with 71 additions and 0 deletions
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4
gdb/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2015-08-12 Patrick Palka <patrick@parcs.ath.cx>
* lib/gdb.exp (save_vars): New proc.
2015-08-11 Keith Seitz <keiths@redhat.com>
* gdb.base/help.exp: Update help_breakpoint_text.

67
gdb/testsuite/lib/gdb.exp
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@ -1897,6 +1897,73 @@ proc with_test_prefix { prefix body } {
}
}
# Run BODY in the context of the caller. After BODY is run, the variables
# listed in VARS will be reset to the values they had before BODY was run.
#
# This is useful for providing a scope in which it is safe to temporarily
# modify global variables, e.g.
#
# global INTERNAL_GDBFLAGS
# global env
#
# set foo GDBHISTSIZE
#
# save_vars { INTERNAL_GDBFLAGS env($foo) env(HOME) } {
# append INTERNAL_GDBFLAGS " -nx"
# unset -nocomplain env(GDBHISTSIZE)
# gdb_start
# gdb_test ...
# }
#
# Here, although INTERNAL_GDBFLAGS, env(GDBHISTSIZE) and env(HOME) may be
# modified inside BODY, this proc guarantees that the modifications will be
# undone after BODY finishes executing.
proc save_vars { vars body } {
array set saved_scalars { }
array set saved_arrays { }
set unset_vars { }
foreach var $vars {
# First evaluate VAR in the context of the caller in case the variable
# name may be a not-yet-interpolated string like env($foo)
set var [uplevel 1 list $var]
if [uplevel 1 [list info exists $var]] {
if [uplevel 1 [list array exists $var]] {
set saved_arrays($var) [uplevel 1 [list array get $var]]
} else {
set saved_scalars($var) [uplevel 1 [list set $var]]
}
} else {
lappend unset_vars $var
}
}
set code [catch {uplevel 1 $body} result]
foreach {var value} [array get saved_scalars] {
uplevel 1 [list set $var $value]
}
foreach {var value} [array get saved_arrays] {
uplevel 1 [list unset $var]
uplevel 1 [list array set $var $value]
}
foreach var $unset_vars {
uplevel 1 [list unset -nocomplain $var]
}
if {$code == 1} {
global errorInfo errorCode
return -code $code -errorinfo $errorInfo -errorcode $errorCode $result
} else {
return -code $code $result
}
}
# Run tests in BODY with GDB prompt and variable $gdb_prompt set to
# PROMPT. When BODY is finished, restore GDB prompt and variable
# $gdb_prompt.