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|
set test "affection"
# Goal: Ensure that the mechanism for figuring out which probes can affect the
# conditions of which other probes works properly. Also verifies that the probes
# lock the proper variables.
# Reads output from stap line by line and returns a list of pairs denoting
# affection. E.g. "1 0 3 4" means that probe 1 affects probe 0 and probe 3
# affects probe 4.
proc parse_affection {output} {
set ret ""
set re "probe (\[0-9\]+) can affect condition of probe (\[0-9\]+)"
foreach line [split $output "\n"] {
if {[regexp "^$re$" $line dummy pidx1 pidx2]} {
set ret "$ret $pidx1 $pidx2"
}
}
return [string trimleft $ret]
}
# Reads output from stap line by line and returns a list of pairs denoting
# locking. E.g. "1 {var1[r] var2[w]} 2 {}" means that probe 1 read-locks var1
# and write-locks var2, while probe 2 locks nothing.
proc parse_locking {output} {
set ret ""
set re "probe (\[0-9\]+) \\('\[^'\]+'\\) locks (.*)"
foreach line [split $output "\n"] {
if {[regexp "^$re$" $line dummy pidx vars] && \
![string equal $vars "nothing"]} {
lappend ret $pidx $vars
}
}
return $ret
}
# Runs a subtest
# @subtest: the name of the subtest
# @expected_affection: the affection expected given as a list of pairs
# @expected_locking: the locking expected given as a list of pairs
# @script: script to test
proc run_subtest {subtest expected_affection expected_locking script} {
global test
verbose -log "running: stap -p3 -vvv -e $script"
if {[catch {exec stap -p3 -vvv -e $script 2>@1} out]} {
fail "$test - $subtest (stap -p3)"
verbose -log "stap output: $out"
return
}
set actual_affection [parse_affection $out]
verbose -log "expected affection: $expected_affection"
verbose -log "received affection: $actual_affection"
if {$expected_affection != $actual_affection} {
fail "$test - $subtest (affection)"
return
}
set actual_locking [parse_locking $out]
verbose -log "expected locking: $expected_locking"
verbose -log "received locking: $actual_locking"
if {$expected_locking != $actual_locking} {
fail "$test - $subtest (locking)"
return
}
pass "$test - $subtest"
}
### SUBTESTS ###
# No affection
# NB: the [list 0 {enabled[rw]}] means "probe 0 locks var enabled for rw"
run_subtest "none" "" [list 0 {__global_enabled[rw]}] {
global enabled = 0 // NB: we try not just 0/1 but other integral values too
probe timer.s(5) {
enabled = enabled ? 0 : 100;
}
}
# NB: the [list 1 0] means "probe 1 affects condition of probe 0"
run_subtest "simple1" [list 1 0] [list 0 {__global_enabled[r]} \
1 {__global_enabled[rw]}] {
global enabled = 0
probe timer.s(1) if (enabled != 0) {
next
}
probe timer.s(5) {
enabled = !enabled
}
}
run_subtest "simple2" [list 0 1] [list 0 {__global_enabled[rw]} \
1 {__global_enabled[r]}] {
global enabled = 0
probe timer.s(5) {
enabled = enabled ? 0 : -9999
}
probe timer.s(1) if (enabled & 0xFFFF) {
next
}
}
run_subtest "self1" [list 0 0] [list 0 {__global_enabled[rw]}] {
global enabled = 0
probe timer.s(1) if (enabled) {
enabled = !enabled
}
}
run_subtest "self2" [list 0 1 \
1 1] \
[list 0 {__global_enabled[rw]} \
1 {__global_enabled[rw]}] {
global enabled = 0
probe timer.s(5) {
enabled = !enabled
}
probe timer.s(1) if (enabled * 1 != 0) {
enabled = !enabled
}
}
run_subtest "many_vars_1" [list 1 0] [list 0 {__global_var1[r] __global_var2[r] __global_var3[r]} \
1 {__global_var1[rw] __global_var2[rw] __global_var3[rw]}] {
global var1 = 0
global var2 = 1
global var3
probe timer.s(1) if (var1 && (var2 || var3)) {
next
}
probe timer.s(5) {
var1 = !var1
var2 = 0xFFFF // not just boolean range!
var3 = var1 && var2
}
}
run_subtest "many_vars_2" [list 0 3 \
1 3 \
2 3] \
[list 0 {__global_var1[rw] __global_var2[r] __global_var3[r]} \
1 {__global_var1[r] __global_var2[rw] __global_var3[r]} \
2 {__global_var1[r] __global_var2[r] __global_var3[rw]} \
3 {__global_var1[r] __global_var2[r] __global_var3[r]}] {
global var1 = 0
global var2 = -1
global var3
probe timer.s(5) {
var1 = !var1
}
probe timer.s(7) {
var2 = ~var2
}
probe timer.s(11) {
var3 = 1-var3
}
probe timer.s(1) if (var1 && (var2 || var3)) {
next
}
}
# NB: This is a tricky test for locking. Probe 1 needs to write-lock var1, but
# also read-lock var2 which needs to be read during the re-evaluation of probe
# 0's condition in the epilogue of probe 1.
run_subtest "many_vars_3" [list 1 0 \
2 0] \
[list 0 {__global_var1[r] __global_var2[r]} \
1 {__global_var1[rw] __global_var2[r]} \
2 {__global_var1[r] __global_var2[rw]}] {
global var1 = 29
global var2 = -0x123
probe timer.s(1) if (var1 || var2) {
next
}
probe timer.s(2) {
var1--
}
probe timer.s(3) {
var2--
}
}
run_subtest "many_probes_1" [list 2 0 \
2 1] \
[list 0 {__global_var1[r]} \
1 {__global_var1[r]} \
2 {__global_var1[rw]}] {
global var1 = 0
probe timer.s(5) if (var1) {
next
}
probe timer.s(7) if (!var1) {
next
}
probe timer.s(11) {
var1 = !var1
}
}
run_subtest "many_probes_2" [list 0 0 \
0 3 \
1 0 \
1 3 \
2 1 \
2 3] \
[list 0 {__global_var1[rw] __global_var2[r] __global_var3[r]} \
1 {__global_var1[r] __global_var2[rw] __global_var3[r]} \
2 {__global_var1[r] __global_var2[r] __global_var3[rw]} \
3 {__global_var1[r] __global_var2[r] __global_var3[r]}] {
global var1 = 0
global var2 = 1
global var3
probe timer.s(5) if (var1 || var2) {
var1 = !var1
}
probe timer.s(7) if (var3) {
var2 = !var2
}
probe timer.s(11) {
var3 = !var3
}
probe timer.s(1) if (var1 && (var2 || var3)) {
next
}
}
run_subtest "functions_1" [list 1 0] \
[list 0 {__global_enabled[r]} \
1 {__global_enabled[rw]}] {
global enabled = 0
probe timer.s(1) if (enabled) {
next
}
function toggler() {
enabled = !enabled
}
probe timer.s(5) {
toggler()
}
}
run_subtest "functions_2" [list 1 0] \
[list 0 {__global_enabled[r]} \
1 {__global_enabled[rw]}] {
global enabled = 0
probe timer.s(1) if (enabled) {
next
}
function realtoggler() {
enabled = !enabled
}
function faketoggler() {
realtoggler()
}
probe timer.s(5) {
faketoggler()
}
}
run_subtest "functions_3" [list 0 1 \
1 0 \
1 1 \
2 0 \
2 1] \
[list 0 {__global_var1[r] __global_var2[rw]} \
1 {__global_var1[rw] __global_var2[r]} \
2 {__global_var1[rw] __global_var2[rw]}] {
global var1 = 0
global var2 = 1
function toggler1() {
var2 = !var2
}
probe timer.s(1) if (var1) {
toggler1()
}
function toggler2() {
var1 = !var1
}
probe timer.s(2) if (!var2 || var1) {
toggler2()
}
probe timer.s(5) {
toggler1()
toggler2()
}
}
|
