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Subject[PATCH v3 16/17] scripts: kernel-doc: improve nested logic to handle multiple identifiers
Date
It is possible to use nested structs like:

struct {
struct {
void *arg1;
} st1, st2, *st3, st4;
};

Handling it requires to split each parameter. Change the logic
to allow such definitions.

In order to test the new nested logic, the following file
was used to test

<code>
struct foo { int a; }; /* Just to avoid errors if compiled */

/**
* struct my_struct - a struct with nested unions and structs
* @arg1: first argument of anonymous union/anonymous struct
* @arg2: second argument of anonymous union/anonymous struct
* @arg1b: first argument of anonymous union/anonymous struct
* @arg2b: second argument of anonymous union/anonymous struct
* @arg3: third argument of anonymous union/anonymous struct
* @arg4: fourth argument of anonymous union/anonymous struct
* @bar.st1.arg1: first argument of struct st1 on union bar
* @bar.st1.arg2: second argument of struct st1 on union bar
* @bar.st1.bar1: bar1 at st1
* @bar.st1.bar2: bar2 at st1
* @bar.st2.arg1: first argument of struct st2 on union bar
* @bar.st2.arg2: second argument of struct st2 on union bar
* @bar.st3.arg2: second argument of struct st3 on union bar
* @f1: nested function on anonimous union/struct
* @bar.st2.f2: nested function on named union/struct
*/
struct my_struct {
/* Anonymous union/struct*/
union {
struct {
char arg1 : 1;
char arg2 : 3;
};
struct {
int arg1b;
int arg2b;
};
struct {
void *arg3;
int arg4;
int (*f1)(char foo, int bar);
};
};
union {
struct {
int arg1;
int arg2;
struct foo bar1, *bar2;
} st1; /* bar.st1 is undocumented, cause a warning */
struct {
void *arg1; /* bar.st3.arg1 is undocumented, cause a warning */
int arg2;
int (*f2)(char foo, int bar); /* bar.st3.fn2 is undocumented, cause a warning */
} st2, st3, *st4;
int (*f3)(char foo, int bar); /* f3 is undocumented, cause a warning */
} bar; /* bar is undocumented, cause a warning */

/* private: */
int undoc_privat; /* is undocumented but private, no warning */

/* public: */
int undoc_public; /* is undocumented, cause a warning */
};
</code>

It produces the following warnings, as expected:

test2.h:57: warning: Function parameter or member 'bar' not described in 'my_struct'
test2.h:57: warning: Function parameter or member 'bar.st1' not described in 'my_struct'
test2.h:57: warning: Function parameter or member 'bar.st2' not described in 'my_struct'
test2.h:57: warning: Function parameter or member 'bar.st3' not described in 'my_struct'
test2.h:57: warning: Function parameter or member 'bar.st3.arg1' not described in 'my_struct'
test2.h:57: warning: Function parameter or member 'bar.st3.f2' not described in 'my_struct'
test2.h:57: warning: Function parameter or member 'bar.st4' not described in 'my_struct'
test2.h:57: warning: Function parameter or member 'bar.st4.arg1' not described in 'my_struct'
test2.h:57: warning: Function parameter or member 'bar.st4.arg2' not described in 'my_struct'
test2.h:57: warning: Function parameter or member 'bar.st4.f2' not described in 'my_struct'
test2.h:57: warning: Function parameter or member 'bar.f3' not described in 'my_struct'
test2.h:57: warning: Function parameter or member 'undoc_public' not described in 'my_struct'

Suggested-by: Markus Heiser <markus.heiser@darmarit.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
---
scripts/kernel-doc | 69 ++++++++++++++++++++++++++++++++++--------------------
1 file changed, 44 insertions(+), 25 deletions(-)

diff --git a/scripts/kernel-doc b/scripts/kernel-doc
index 67e8712aa324..049044d95c0e 100755
--- a/scripts/kernel-doc
+++ b/scripts/kernel-doc
@@ -1008,15 +1008,16 @@ sub dump_struct($$) {
my $declaration = $members;

# Split nested struct/union elements as newer ones
- my $cont = 1;
- while ($cont) {
- $cont = 0;
- while ($members =~ m/(struct|union)([^{};]+){([^{}]*)}([^{}\;]*)\;/) {
- my $newmember = "$1 $4;";
- my $id = $4;
- my $content = $3;
+ while ($members =~ m/(struct|union)([^{};]+){([^{}]*)}([^{}\;]*)\;/) {
+ my $newmember;
+ my $maintype = $1;
+ my $ids = $4;
+ my $content = $3;
+ foreach my $id(split /,/, $ids) {
+ $newmember .= "$maintype $id; ";
+
$id =~ s/[:\[].*//;
- $id =~ s/^\*+//;
+ $id =~ s/^\s*\**(\S+)\s*/$1/;
foreach my $arg (split /;/, $content) {
next if ($arg =~ m/^\s*$/);
if ($arg =~ m/^([^\(]+\(\*?\s*)([\w\.]*)(\s*\).*)/) {
@@ -1027,30 +1028,48 @@ sub dump_struct($$) {
next if (!$name);
if ($id =~ m/^\s*$/) {
# anonymous struct/union
- $newmember .= "$type$name$extra;";
+ $newmember .= "$type$name$extra; ";
} else {
- $newmember .= "$type$id.$name$extra;";
+ $newmember .= "$type$id.$name$extra; ";
}
} else {
- my $type = $arg;
- my $name = $arg;
- $type =~ s/\s\S+$//;
- $name =~ s/.*\s+//;
- $name =~ s/[:\[].*//;
- $name =~ s/^\*+//;
- next if (($name =~ m/^\s*$/));
- if ($id =~ m/^\s*$/) {
- # anonymous struct/union
- $newmember .= "$type $name;";
+ my $type;
+ my $names;
+ $arg =~ s/^\s+//;
+ $arg =~ s/\s+$//;
+ # Handle bitmaps
+ $arg =~ s/:\s*\d+\s*//g;
+ # Handle arrays
+ $arg =~ s/\[\S+\]//g;
+ # The type may have multiple words,
+ # and multiple IDs can be defined, like:
+ # const struct foo, *bar, foobar
+ # So, we remove spaces when parsing the
+ # names, in order to match just names
+ # and commas for the names
+ $arg =~ s/\s*,\s*/,/g;
+ if ($arg =~ m/(.*)\s+([\S+,]+)/) {
+ $type = $1;
+ $names = $2;
} else {
- $newmember .= "$type $id.$name;";
+ $newmember .= "$arg; ";
+ next;
+ }
+ foreach my $name (split /,/, $names) {
+ $name =~ s/^\s*\**(\S+)\s*/$1/;
+ next if (($name =~ m/^\s*$/));
+ if ($id =~ m/^\s*$/) {
+ # anonymous struct/union
+ $newmember .= "$type $name; ";
+ } else {
+ $newmember .= "$type $id.$name; ";
+ }
}
}
}
- $members =~ s/(struct|union)([^{};]+){([^{}]*)}([^{}\;]*)\;/$newmember/;
- $cont = 1;
- };
- };
+ }
+ $members =~ s/(struct|union)([^{};]+){([^{}]*)}([^{}\;]*)\;/$newmember/;
+ }

# Ignore other nested elements, like enums
$members =~ s/({[^\{\}]*})//g;
--
2.13.6
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