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# cache.exp
# flag values
proc F_UNCACHED {} {return 0x1}; # compilation should be uncached
proc F_CACHED {} {return 0x2}; # compilation should be cached
proc F_NO_COMPILE {} {return 0x4}; # script doesn't compile
proc F_COMPILE {} {return 0x8}; # script compiles
# mask values to get either the cache vale or the compile value
proc F_CACHE_MASK {} {return [expr [F_UNCACHED] | [F_CACHED]]}
proc F_COMPILE_MASK {} {return [expr [F_NO_COMPILE] | [F_COMPILE]]}
# convenience combination of flags
proc F_CACHED_COMPILE {} {return [expr [F_CACHED] | [F_COMPILE]]}
proc F_UNCACHED_COMPILE {} {return [expr [F_UNCACHED] | [F_COMPILE]]}
proc F_UNCACHED_NO_COMPILE {} {return [expr [F_UNCACHED] | [F_NO_COMPILE]]}
# cache_compile TEST_NAME flags script args
# - TEST_NAME is the name of the current test
# - flags indicates the expected outcome of this test
# - script is the script to compile
# Additional arguments are passed to stap as-is.
proc cache_compile { TEST_NAME flags script args } {
set cmd [concat {stap -v -p4 -e} $script $args]
eval spawn $cmd
set cached 0
set compile_errors 0
expect {
-timeout 180
-re {^Pass\ [1234]:[^\r]*\ in\ [^\r]*\ ms\.\r\n} {exp_continue}
-re {^Pass\ [34]: using cached [^\r\n]+\r\n} {incr cached 1; exp_continue}
-re "^WARNING" {exp_continue}
# pass-4 output
-re {^/[^\r\n]+\.ko\r\n} {exp_continue}
-re "compilation failed" {incr compile_errors 1; exp_continue}
-re "semantic error:" {incr compile_errors 1; exp_continue}
timeout { fail "$TEST_NAME (timeout)" }
}
catch close
wait
# If we've got compile errors and the script was supposed to
# compile, fail.
if {$compile_errors > 0
&& [expr $flags & [F_COMPILE_MASK]] == [F_COMPILE]} {
fail "$TEST_NAME compilation failed"
return
}
# If we were supposed to use a cached module...
if {[expr $flags & [F_CACHE_MASK]] == [F_CACHED]} {
if {$cached == 2} {
pass "$TEST_NAME was cached"
} else {
fail "$TEST_NAME wasn't cached"
}
# If we weren't supposed to use a cached module...
} else {
if {$cached > 0} {
fail "$TEST_NAME was cached"
} else {
pass "$TEST_NAME wasn't cached"
}
}
}
# Since we need a clean cache directory, we'll use a temporary
# systemtap directory and cache (add user name so make check and
# sudo make installcheck don't clobber each others)
set local_systemtap_dir [exec pwd]/.cache_test-[exec whoami]
exec /bin/rm -rf $local_systemtap_dir
if [info exists env(SYSTEMTAP_DIR)] {
set old_systemtap_dir $env(SYSTEMTAP_DIR)
}
set env(SYSTEMTAP_DIR) $local_systemtap_dir
# Set up the scripts we'll use.
set basic_script1 "\"probe begin { println(1) }\""
set basic_script2 "\"probe begin, end { println(2) }\""
set error_script "\"probe XbeginX { }\""
# Check basic functionality. The 1st compilation of a script won't
# be cached, the 2nd should be cached.
cache_compile BASIC1 [F_UNCACHED_COMPILE] $basic_script1
cache_compile BASIC2 [F_CACHED_COMPILE] $basic_script1
# Adding in a macro definition should change the hash
cache_compile OPTION1 [F_UNCACHED_COMPILE] $basic_script1 -DFOO=1
cache_compile OPTION2 [F_CACHED_COMPILE] $basic_script1 -DFOO=1
# Using '-b' (bulk/relayfs mode) should change the hash
cache_compile BULK1 [F_UNCACHED_COMPILE] $basic_script1 -b
cache_compile BULK2 [F_CACHED_COMPILE] $basic_script1 -b
# Using '-M' (don't merge per-cpu files for bulk mode) should change
# the hash
cache_compile MERGE1 [F_UNCACHED_COMPILE] $basic_script1 -b -M
cache_compile MERGE2 [F_CACHED_COMPILE] $basic_script1 -b -M
# Using '-t' (benchmark timing) should change the hash
cache_compile TIMING1 [F_UNCACHED_COMPILE] $basic_script1 -t
cache_compile TIMING2 [F_CACHED_COMPILE] $basic_script1 -t
# Changing the runtime directory should change the hash
set new_runtime [exec pwd]/.cache_test_runtime
exec /bin/rm -f $new_runtime
exec /bin/ln -s $env(SYSTEMTAP_RUNTIME) $new_runtime
cache_compile RUNTIME1 [F_UNCACHED_COMPILE] $basic_script1 -R $new_runtime
cache_compile RUNTIME2 [F_CACHED_COMPILE] $basic_script1 -R $new_runtime
exec /bin/rm -f $new_runtime
# Disable the cache with SYSTEMTAP_DIR
set env(SYSTEMTAP_DIR) /dev/null
cache_compile DISABLED1 [F_UNCACHED_COMPILE] $basic_script1
cache_compile DISABLED2 [F_UNCACHED_COMPILE] $basic_script1
set env(SYSTEMTAP_DIR) $local_systemtap_dir
eval [list exec /bin/rm -f] [glob "stap_*.ko"]
# Disable the cache with '-m'
cache_compile MODNAM1 [F_UNCACHED_COMPILE] $basic_script1 -m modnam
exec /bin/rm -f modnam.ko
cache_compile MODNAM2 [F_UNCACHED_COMPILE] $basic_script1 -m modnam
exec /bin/rm -f modnam.ko
# Make sure scripts that don't actually compile don't get cached
cache_compile ERROR1 [F_UNCACHED_NO_COMPILE] $error_script
cache_compile ERROR2 [F_UNCACHED_NO_COMPILE] $error_script
# Make sure basic stuff still works.
cache_compile BASIC3 [F_UNCACHED_COMPILE] $basic_script2
cache_compile BASIC4 [F_CACHED_COMPILE] $basic_script2
# Cleanup.
exec /bin/rm -rf $local_systemtap_dir
if [info exists old_systemtap_dir] {
set env(SYSTEMTAP_DIR) $old_systemtap_dir
} else {
unset env(SYSTEMTAP_DIR)
}
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