jyapayne/swig
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

Fix crash in Python backend when using empty docstrings

Browse source 
Due to confusion in build_combined_docstring(), we could call
DohDelete() on the "feature:docstring" string, which resulted in a crash
when trying to use it later.

Fix this and simplify the code at the same time by ensuring that we
always use a copy of "feature:docstring" if it's not empty or don't use
it at all if it's empty -- like this we don't have to check for its
length each time before using it.

Closes #1648.
This commit is contained in:
Vadim Zeitlin 2020-01-25 17:06:20 +01:00
commit e14532ce52
3 changed files with 22 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

15
Source/Modules/python.cxx
View file

@ -1484,8 +1484,15 @@ public:
String *build_combined_docstring(Node *n, autodoc_t ad_type, const String *indent = "", bool low_level = false) {
String *docstr = Getattr(n, "feature:docstring");
if (docstr && Len(docstr)) {
docstr = Copy(docstr);
if (docstr) {
// Simplify the code below by just ignoring empty docstrings.
if (!Len(docstr))
docstr = NULL;
else
docstr = Copy(docstr);
}
if (docstr) {
char *t = Char(docstr);
if (*t == '{') {
Delitem(docstr, 0);
@ -1496,7 +1503,7 @@ public:
if (Getattr(n, "feature:autodoc") && !GetFlag(n, "feature:noautodoc")) {
String *autodoc = make_autodoc(n, ad_type, low_level);
if (autodoc && Len(autodoc) > 0) {
if (docstr && Len(docstr)) {
if (docstr) {
Append(autodoc, "\n");
Append(autodoc, docstr);
}
@ -1509,7 +1516,7 @@ public:
Delete(autodoc);
}
if (!docstr || !Len(docstr)) {
if (!docstr) {
if (doxygen) {
docstr = Getattr(n, "python:docstring");
if (!docstr && doxygenTranslator->hasDocumentation(n)) {