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CLang's optimizer is more aggressive at inlining functions than gcc and so will often inline functions that our tests want to mock-override. This causes the test to fail in bizarre ways. We don't want to disable inlining completely, but we must at least prevent inlining of mocked functions. Fortunately there is a 'noinline' attribute that lets us control this per function. A syntax check rule is added that parses tests/*mock.c to extract the list of functions that are mocked (restricted to names starting with 'vir' prefix). It then checks that src/*.h header file to ensure it has a 'ATTRIBUTE_NOINLINE' annotation. This should prevent use from bit-rotting in future. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
73 lines
1.5 KiB
Perl
73 lines
1.5 KiB
Perl
#!/usr/bin/perl
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my %noninlined;
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my %mocked;
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# Functions in public header don't get the noinline annotation
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# so whitelist them here
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$noninlined{"virEventAddTimeout"} = 1;
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foreach my $arg (@ARGV) {
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if ($arg =~ /\.h$/) {
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#print "Scan header $arg\n";
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&scan_annotations($arg);
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} elsif ($arg =~ /mock\.c$/) {
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#print "Scan mock $arg\n";
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&scan_overrides($arg);
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}
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}
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my $warned = 0;
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foreach my $func (keys %mocked) {
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next if exists $noninlined{$func};
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$warned++;
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print STDERR "$func is mocked at $mocked{$func} but missing noinline annotation\n";
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}
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exit $warned ? 1 : 0;
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sub scan_annotations {
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my $file = shift;
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open FH, $file or die "cannot read $file: $!";
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my $func;
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while (<FH>) {
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if (/^\s*(\w+)\(/ || /^(?:\w+\*?\s+)+(?:\*\s*)?(\w+)\(/) {
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my $name = $1;
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if ($name !~ /ATTRIBUTE/) {
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$func = $name;
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}
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} elsif (/^\s*$/) {
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$func = undef;
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}
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if (/ATTRIBUTE_NOINLINE/) {
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if (defined $func) {
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$noninlined{$func} = 1;
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}
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}
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}
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close FH
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}
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sub scan_overrides {
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my $file = shift;
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open FH, $file or die "cannot read $file: $!";
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my $func;
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while (<FH>) {
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if (/^(\w+)\(/ || /^\w+\s*(?:\*\s*)?(\w+)\(/) {
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my $name = $1;
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if ($name =~ /^vir/) {
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$mocked{$name} = "$file:$.";
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}
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}
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}
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close FH
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}
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