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of: unittest: add program to process EXPECT messages
If unittest detects a problem it will print a warning or error message to the console. Unittest also triggers warning and error messages from other kernel code as a result of intentionally bad unittest data. This has led to confusion as to whether the triggered messages are an expected result of a test or whether there is a real problem that is independent of unittest. EXPECT messages were added to unittest to report each triggered message that is expected, resulting in verbose console output. scripts/dtc/of_unittest is a new program that processes the EXPECT messages to determine whether the triggered messages occurred and also removes the excess verbosity of the EXPECT messages. More information is available from 'scripts/dtc/of_unittest_expect --help'. Signed-off-by: Frank Rowand <frank.rowand@sony.com> Signed-off-by: Rob Herring <robh@kernel.org> Link: https://lore.kernel.org/r/20220201181413.2719955-1-frowand.list@gmail.com
This commit is contained in:
Frank Rowand
Rob Herring
parent
4eb7b1339c
commit
8e4296c286
@ -24,7 +24,28 @@ from the unflattened device tree data structure. This interface is used by
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most of the device drivers in various use cases.
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2. Test-data
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2. Verbose Output (EXPECT)
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==========================
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If unittest detects a problem it will print a warning or error message to
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the console. Unittest also triggers warning and error messages from other
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kernel code as a result of intentionally bad unittest data. This has led
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to confusion as to whether the triggered messages are an expected result
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of a test or whether there is a real problem that is independent of unittest.
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'EXPECT \ : text' (begin) and 'EXPECT / : text' (end) messages have been
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added to unittest to report that a warning or error is expected. The
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begin is printed before triggering the warning or error, and the end is
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printed after triggering the warning or error.
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The EXPECT messages result in very noisy console messages that are difficult
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to read. The script scripts/dtc/of_unittest_expect was created to filter
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this verbosity and highlight mismatches between triggered warnings and
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errors vs expected warnings and errors. More information is available
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from 'scripts/dtc/of_unittest_expect --help'.
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3. Test-data
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============
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The Device Tree Source file (drivers/of/unittest-data/testcases.dts) contains
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@ -56,7 +77,7 @@ The assembly file is compiled into an object file (testcases.dtb.o), and is
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linked into the kernel image.
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2.1. Adding the test data
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3.1. Adding the test data
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-------------------------
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Un-flattened device tree structure:
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@ -191,7 +212,7 @@ properties are updated to the live tree's node by calling the function
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update_node_properties().
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2.2. Removing the test data
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3.2. Removing the test data
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---------------------------
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Once the test case execution is complete, selftest_data_remove is called in
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408
scripts/dtc/of_unittest_expect
Executable file
408
scripts/dtc/of_unittest_expect
Executable file
@ -0,0 +1,408 @@
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#!/usr/bin/perl
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# SPDX-License-Identifier: GPL-2.0
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#
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# Copyright 2020, 2022 Sony Corporation
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#
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# Author: Frank Rowand
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# This program is meant to be an aid to reading the verbose output of
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# on the console log that results from executing the Linux kernel
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# devicetree unittest (drivers/of/unitest.c).
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$VUFX = "220201a";
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use strict 'refs';
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use strict subs;
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use Getopt::Long;
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use Text::Wrap;
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# strip off everything before final "/"
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(undef, $script_name) = split(/^.*\//, $0);
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# following /usr/include/sysexits.h
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$EX_OK=0;
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$EX_USAGE=64;
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#______________________________________________________________________________
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sub compare {
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my ($expect, $got) = @_;
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my $expect_next;
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my $expect_next_lit;
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my $got_next;
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my $type;
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while ($expect) {
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($expect_next, $type) = split(/<</, $expect);
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($type) = split(/>>/, $type);
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$expect =~ s/^.*?>>//; # '?' is non-greedy, minimal match
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# literal, ignore all metacharacters when used in a regex
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$expect_next_lit = quotemeta($expect_next);
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$got_next = $got;
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$got_next =~ s/^($expect_next_lit).*/\1/;
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$got =~ s/^$expect_next_lit//;
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if ($expect_next ne $got_next) {
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return 0;
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}
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if ($type eq "int") {
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if ($got =~ /^[+-]*[0-9]+/) {
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$got =~ s/^[+-]*[0-9]+//;
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} else {
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return 0;
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}
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} elsif ($type eq "hex") {
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if ($got =~ /^(0x)*[0-9a-f]+/) {
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$got =~ s/^(0x)*[0-9a-f]+//;
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} else {
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return 0;
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}
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} elsif ($type eq "") {
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if ($expect_next ne $got_next) {
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return 0;
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} else {
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return 1;
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}
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} else {
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$internal_err++;
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print "** ERROR: special pattern not recognized: <<$type>>, CONSOLE_LOG line: $.\n";
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return 0;
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}
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}
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# should not get here
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$internal_err++;
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print "** ERROR: $script_name internal error, at end of compare(), CONSOLE_LOG line: $.\n";
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return 0;
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}
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#______________________________________________________________________________
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sub usage {
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# ***** when editing, be careful to not put tabs in the string printed:
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print STDERR
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"
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usage:
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$script_name CONSOLE_LOG
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-h print program usage
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--help print program usage
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--hide-expect suppress output of EXPECTed lines
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--line-num report line number of CONSOLE_LOG
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--no-expect-stats do not report EXPECT statistics
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--no-strip-ts do not strip leading console timestamps
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--verbose do not suppress EXPECT begin and end lines
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--version print program version and exit
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Process a console log for EXPECTed test related messages to either
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highlight expected devicetree unittest related messages or suppress
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the messages. Leading console timestamps will be stripped.
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Various unittests may trigger kernel messages from outside the
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unittest code. The unittest annotates that it expects the message
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to occur with an 'EXPECT \\ : text' (begin) before triggering the
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message, and an 'EXPECT / : text' (end) after triggering the message.
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If an expected message does not occur, that will be reported.
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For each expected message, the 'EXPECT \\ : text' (begin) and
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'EXPECT / : text' (end), 'text' will contain the message text.
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If 'EXPECT \\' (begin) and 'EXPECT /' (end) lines do not contain
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matching 'text', that will be reported.
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If EXPECT lines are nested, 'EXPECT /' (end) lines must be in the
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reverse order of the corresponding 'EXPECT \\' (begin) lines.
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'EXPECT \\ : text' (begin) and 'EXPECT / : text' (end) lines can
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contain special patterns in 'text':
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<<int>> matches: [+-]*[0-9]+
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<<hex>> matches: (0x)*[0-9a-f]+
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'EXPECT \\' (begin) and 'EXPECT /' (end) lines are suppressed.
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A prefix is added to every line of output:
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'ok ' Line matches an enclosing EXPECT begin/end pair
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'** ' Line reports $script_name warning or error
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'-> ' Line reports start or end of the unittests
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'>> ' Line reports a unittest test FAIL
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' ' Lines that are not otherwise prefixed
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Issues detected in CONSOLE_LOG are reported to STDOUT, not to STDERR.
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Known Issues:
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--line-num causes the CONSOLE_LOG line number to be printed in 4 columns.
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If CONSOLE_LOG contains more than 9999 lines then more columns will be
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used to report the line number for lines greater than 9999 (eg for
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lines 10000 - 99999, 5 columns will be used).
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";
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return {};
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}
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#______________________________________________________________________________
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#______________________________________________________________________________
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if (!GetOptions(
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"h" => \$help,
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"help" => \$help,
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"hide-expect" => \$hide_expect,
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"line-num" => \$print_line_num,
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"no-expect-stats" => \$no_expect_stats,
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"no-strip-ts" => \$no_strip_ts,
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"verbose" => \$verbose,
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"version" => \$version,
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)) {
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print STDERR "\n";
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print STDERR "ERROR processing command line options\n";
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print STDERR "\n";
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print STDERR "For help, type '$script_name --help'\n";
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print STDERR "\n";
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exit $EX_OK;
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}
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if ($no_strip_ts) {
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$strip_ts = 1;
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$no_strip_ts = 0;
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} else {
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$strip_ts = 0;
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$no_strip_ts = 1;
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}
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# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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if ($help){
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&usage;
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exit $EX_OK;
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}
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# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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if ($version) {
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print STDERR "\n$script_name $VUFX\n\n";
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print STDERR "\n";
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exit $EX_OK;
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}
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# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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if ($#ARGV != 0) {
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# Limit input files to exactly one.
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#
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# 'while ($line = <ARGV>) {' in the code below supports multiple file
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# names on the command line, but the EXPECT statistics are reported
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# once for all input - it is not an expected use case to generate one
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# set of statistics for multiple input files.
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print STDERR "\n";
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print STDERR "Required arguments: CONSOLE_LOG\n";
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print STDERR "\n";
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exit $EX_USAGE;
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}
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#______________________________________________________________________________
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# Patterns to match 'EXPECT \ : ' (begin) and 'EXPECT / : ' (end)
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#
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# $exp_* are used as regex match patterns,
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# so '\\\\' in $exp_begin matches a single '\'
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# quotemeta() does not do the right thing in this case
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#
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# $pr_fmt is the prefix that unittest prints for every message
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$pr_fmt = "### dt-test ### ";
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$exp_begin = "${pr_fmt}EXPECT \\\\ : ";
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$exp_end = "${pr_fmt}EXPECT / : ";
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$line_num = "";
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$timestamp = "";
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LINE:
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while ($line = <ARGV>) {
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chomp $line;
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$prefix = " "; ## 2 characters
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if ($strip_ts) {
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$timestamp = $line;
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if ($timestamp =~ /^\[\s*[0-9]+\.[0-9]*\] /) {
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($timestamp, $null) = split(/]/, $line);
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$timestamp = $timestamp . "] ";
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} else {
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$timestamp = "";
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}
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}
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$line =~ s/^\[\s*[0-9]+\.[0-9]*\] //;
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# ----- find EXPECT begin
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if ($line =~ /^\s*$exp_begin/) {
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$data = $line;
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$data =~ s/^\s*$exp_begin//;
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push @begin, $data;
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if ($verbose) {
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if ($print_line_num) {
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$line_num = sprintf("%4s ", $.);
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}
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printf "%s %s%s%s\n", $prefix, $line_num, $timestamp, $line;
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}
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next LINE;
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}
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# ----- find EXPECT end
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if ($line =~ /^\s*$exp_end/) {
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$data = $line;
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$data =~ s/^\s*$exp_end//;
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if ($verbose) {
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if ($print_line_num) {
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$line_num = sprintf("%4s ", $.);
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}
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printf "%s %s%s%s\n", $prefix, $line_num, $timestamp, $line;
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}
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$found = 0;
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$no_begin = 0;
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if (@found_or_begin > 0) {
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$begin = pop @found_or_begin;
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if (compare($data, $begin)) {
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$found = 1;
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}
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} elsif (@begin > 0) {
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$begin = pop @begin;
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} else {
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$no_begin = 1;
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}
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if ($no_begin) {
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$expect_missing_begin++;
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print "** ERROR: EXPECT end without any EXPECT begin:\n";
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print " end ---> $line\n";
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} elsif (! $found) {
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if ($print_line_num) {
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$line_num = sprintf("%4s ", $.);
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}
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$expect_not_found++;
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printf "** %s%s$script_name WARNING - not found ---> %s\n",
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$line_num, $timestamp, $data;
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} elsif (! compare($data, $begin)) {
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$expect_missing_end++;
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print "** ERROR: EXPECT end does not match EXPECT begin:\n";
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print " begin -> $begin\n";
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print " end ---> $line\n";
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} else {
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$expect_found++;
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}
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next LINE;
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}
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# ----- not an EXPECT line
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if (($line =~ /^${pr_fmt}start of unittest - you will see error messages$/) ||
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($line =~ /^${pr_fmt}end of unittest - [0-9]+ passed, [0-9]+ failed$/ ) ) {
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$prefix = "->"; # 2 characters
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} elsif ($line =~ /^${pr_fmt}FAIL /) {
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$unittest_fail++;
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$prefix = ">>"; # 2 characters
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}
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$found = 0;
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foreach $begin (@begin) {
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if (compare($begin, $line)) {
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$found = 1;
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last;
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}
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}
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if ($found) {
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$begin = shift @begin;
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while (! compare($begin, $line)) {
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push @found_or_begin, $begin;
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$begin = shift @begin;
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}
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push @found_or_begin, $line;
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if ($hide_expect) {
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$suppress_line = 1;
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next LINE;
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}
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$prefix = "ok"; # 2 characters
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}
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if ($print_line_num) {
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$line_num = sprintf("%4s ", $.);
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}
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printf "%s %s%s%s\n", $prefix, $line_num, $timestamp, $line;
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}
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if (! $no_expect_stats) {
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print "\n";
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print "** EXPECT statistics:\n";
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print "**\n";
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printf "** EXPECT found : %4i\n", $expect_found;
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printf "** EXPECT not found : %4i\n", $expect_not_found;
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printf "** missing EXPECT begin : %4i\n", $expect_missing_begin;
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printf "** missing EXPECT end : %4i\n", $expect_missing_end;
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printf "** unittest FAIL : %4i\n", $unittest_fail;
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printf "** internal error : %4i\n", $internal_err;
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}
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if (@begin) {
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print "** ERROR: EXPECT begin without any EXPECT end:\n";
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print " This list may be misleading.\n";
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foreach $begin (@begin) {
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print " begin ---> $begin\n";
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}
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}
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