https://bugs.kde.org/show_bug.cgi?id=409596
Bug ID: 409596
Summary: Adding a lambda as a template argument in a specific
project (of mine) causes a crash when trying to parse
a file.
Product: kdevelop
Version: git master
Platform: Manjaro
OS: Linux
Status: REPORTED
Severity: crash
Priority: NOR
Component: Code completion
Assignee: kdevelop-bugs-n...@kde.org
Reporter: mattibr...@protonmail.com
Target Milestone: ---
Created attachment 121371
--> https://bugs.kde.org/attachment.cgi?id=121371&action=edit
File attempting to produce a reduced form of the bug (failed)
SUMMARY
Adding a lambda as a template argument in a specific project (of mine) causes a
crash when trying to parse a file.
STEPS TO REPRODUCE
1. Download the project via `git clone
https://gitlab.com/TheEdenCrazy/correlative-neural-network.git`, `git checkout
e8861a831819b858f9792570b8aebe9b2641b06b`
2. Open in kdevelop, making sure to set the C++ parser to C++17 (I don't know
if the bug is c++-version-dependent but this should replicate it).
3. Add `_impl_add_t<&neuron_index::idx, [](){}> v;` to the file at
"correlative-neural-network/library/include/cnn/storeprotodef/field_encode_gen.hpp",
as a member of the template struct `_impl_FieldEncodingGenerator`, after the
templates.
OBSERVED RESULT
KDevelop crashes with a segfault after producing the following on the console:
QProcess: Destroyed while process ("clang") is still running.
kdevplatform.shell: process finished with error: QProcess::Crashed
QProcess: Destroyed while process ("clang") is still running.
kdevplatform.shell: process finished with error: QProcess::Crashed
kdevelop.plugins.clang: Unhandled type: Dependent <dependent type>
kdevelop.plugins.clang: Unhandled type: Dependent <dependent type>
kdevelop.plugins.clang: Unhandled type: Dependent <dependent type>
kdevelop.plugins.clang: Unhandled type: Dependent <dependent type>
kdevelop.plugins.clang: Unhandled type: Dependent <dependent type>
kdevelop.plugins.clang: Unhandled type: Dependent <dependent type>
EXPECTED RESULT
KDevelop does not crash, and (depending on the C++ version) there is either a
syntax error or no syntax error (C++20 allows lambdas as function template
arguments).
SOFTWARE/OS VERSIONS
Windows:
macOS:
Linux/KDE Plasma: Manjaro (latest update)
(available in About System)
KDE Plasma Version: [using xfce4-gtk3]
KDE Frameworks Version: KDevelop 5.3.2 and KDevelop as built from master.
Qt Version: 5.12.4
ADDITIONAL INFORMATION
I downloaded the Kdevelop project and built it and examined it in a debugger.
As far as I can tell, the issue is related to the parser not recognising the
type as one of those processed in kdevelop/plugins/clang, builder.cpp,
Visitor::makeType.
I have attempted to replicate the bug by simply copy-pasting the core type
structure (i.e. type-template in template in 2 namespaces), but it does not
work. However, I cannot replicate it and it produces the expected behaviour.
See the file I used for testing attached.
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