Intellisense not working

[dbersan]

Specs: Ubuntu 18.04, VSCode 1.47.3, C/C++ extension 0.30.0-insiders2 (also tried the non-insiders)

It's truly remarkable C++ has been around for at least 40 years and we still don't have a proper intellisense.

It is underlying in red the include header:

Even though I can still Ctrl+click it and go to the source file:

Of course I wouldn't be posting this issue if this were the only problem.

I also don't get auto-complete:

As a matter of fact, it gives me wrong auto-completion suggestions:

Yes, .vscode/c_cpp_properties.json exists, at the root of the folder, and contains the following:

{
    "configurations": [
        {
            "browse": {
                "databaseFilename": "",
                "limitSymbolsToIncludedHeaders": true
            },
            "includePath": [
                "/home/user/catkin_ws/devel/include/**",
                "/opt/ros/melodic/include/**",
                "/usr/include/**",
                "include/"
            ],
            "name": "ROS",
            "intelliSenseMode": "gcc-x64",
            "compilerPath": "/usr/bin/gcc",
            "cStandard": "gnu11",
            "cppStandard": "gnu++14",
            "compileCommands": "${workspaceFolder}/build/compile_commands.json"
        }
    ],
    "version": 4
}

/opt/ros/melodic/include/contains the ros folder with the header.

Am I doing something wrong?

[sean-mcmanus]

The "file not found" error message is from the C/C++ Clang Command Adapter extension and not the C++ extension.

After you disable that other extension, if you still get errors, you may want to run C/C++: Log Diagnostics (from the Command Palette) to see what include paths are getting passed to IntelliSense. And although you're using compileCommands, so the includePath setting won't be used unless it falls back to that, it would also be good to remove the system includes from includePath, because system includes should be auto-obtained from the compilerPath setting.

[dbersan]

The "file not found" error message is from the C/C++ Clang Command Adapter extension and not the C++ extension.

You are right about this, I tried installing this C lang extension to see if it solved the problem and forgot to remove. Now there is no re underlining.

it would also be good to remove the system includes from includePath, because system includes should be auto-obtained from the compilerPath setting

I removed it and still no auto complete.

you may want to run C/C++: Log Diagnostics (from the Command Palette)

here is the output, after removing system path.

-------- Diagnostics - 8/13/2020, 9:00:17 PM
Version: 0.30.0-insiders2
Current Configuration:
{
    "browse": {
        "limitSymbolsToIncludedHeaders": true,
        "path": [
            "/home/user/catkin_ws/devel/include/**",
            "/opt/ros/melodic/include/**",
            "include/",
            "${workspaceFolder}"
        ]
    },
    "includePath": [
        "/home/user/catkin_ws/devel/include/**",
        "/opt/ros/melodic/include/**",
        "include/"
    ],
    "name": "ROS",
    "intelliSenseMode": "gcc-x64",
    "compilerPath": "/usr/bin/g++-7",
    "cStandard": "gnu11",
    "cppStandard": "gnu++14",
    "compileCommands": "${workspaceFolder}/build/compile_commands.json",
    "compilerArgs": []
}
Translation Unit Mappings:
[ /home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp ]:
    /home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp
    /home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/include/driver/edo_driver.h
[ /home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface_node.cpp ]:
    /home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface_node.cpp
Translation Unit Configurations:
[ /home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp ]:
    Process ID: 18461
    Memory Usage: 259 MB
    Compiler Path: /usr/bin/g++-7
    Includes:
        /home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/include
        /usr/include/c++/7
        /usr/include/x86_64-linux-gnu/c++/7
        /usr/include/c++/7/backward
        /usr/lib/gcc/x86_64-linux-gnu/7/include
        /usr/local/include
        /usr/lib/gcc/x86_64-linux-gnu/7/include-fixed
        /usr/include/x86_64-linux-gnu
        /usr/include
        /home/user/catkin_ws/devel/include
        /opt/ros/melodic/include
        /opt/ros/melodic/include/g2o
        /opt/ros/melodic/include/moveit
    Standard Version: c++14
    IntelliSense Mode: gcc-x64
    Other Flags:
        --g++
        --gnu_version=70500
[ /home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface_node.cpp ]:
    Process ID: 18537
    Memory Usage: 466 MB
    Compiler Path: /usr/bin/g++-7
    Includes:
        /home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/include
        /usr/include/c++/7
        /usr/include/x86_64-linux-gnu/c++/7
        /usr/include/c++/7/backward
        /usr/lib/gcc/x86_64-linux-gnu/7/include
        /usr/local/include
        /usr/lib/gcc/x86_64-linux-gnu/7/include-fixed
        /usr/include/x86_64-linux-gnu
        /usr/include
        /opt/ros/melodic/include
        /opt/ros/melodic/include/g2o
        /opt/ros/melodic/include/moveit
    Standard Version: c++14
    IntelliSense Mode: gcc-x64
    Other Flags:
        --g++
        --gnu_version=70500
Total Memory Usage: 725 MB

[dbersan]

One weird thing that is happening is that I have the following structure:

And the autocomplete works fine on files like edo_hardware.h, edo_hardware_interface.h, edo_hardware_interface.cpp (each includes the other, sequentially):

But it does not work on edo_driver.h (or edo_driver.cpp), which is on another folder and doesn't include those files:

Even though they include the same header...

[sean-mcmanus]

Your includePath output looks good. Are you getting any error squiggles in edo_driver.cpp? Does any other IntelliSense functionality work in edo_driver.cpp (or edo_driver.h), such as error squiggles (if you add a syntax error) or go to definition on a local variable?

If you check your "C/C++" logging (not the C/C++ Diagnostics logging) do you see a "Failed to read response from server"? That would mean the IntelliSense process is crashing. 0.30.0-insiders2 has one known completion crash regression (#5960). If you don't see the "C/C++" logging pane then there hasn't been any error level logging.

[dbersan]

Your includePath output looks good. Are you getting any error squiggles in edo_driver.cpp? Does any other IntelliSense functionality work in edo_driver.cpp (or edo_driver.h), such as error squiggles (if you add a syntax error) or go to definition on a local variable?

Actually, in edo_driver.cpp auto-complete does not seem to work at all. I can still go to definitions, I don't see any syntax errors when I type somethign wrong:

If you check your "C/C++" logging (not the C/C++ Diagnostics logging) do you see a "Failed to read response from server"?

Where can I find this?

[sean-mcmanus]

If you don't get syntax errors, then IntelliSense is not functioning at all for that particular TU. Go to Definition on global variables can still operate without the IntelliSense process via querying the database, but you should see Go to Definition on local variables not working.

We have documentation on enabling debug logging at https://code.visualstudio.com/docs/cpp/enable-logging-cpp , but "Error" level logging should be sufficient for seeing if there's a crash, but Debug logging may show additional helpful diagnostics. Do you see any logging that appears to be unexpected?

[sean-mcmanus]

Also, we only shows errors for the currently open files, but it's possible a header file could be causing a parser error that is causing a cascading parse failure in the open files, so one potential thing to try is to use something like "g++ -E -std=c++17 > test.out.cpp" to generate a preprocessed file with no #includes and seeing if you see any IntelliSense errors with that file.

[dbersan]

I tried doing "Error" level logging, but I get absolutely no error ever. With "Information" level I get the following for working and non-working files:

Checking for syntax errors: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/include/edo_hardware_interface/edo_hardware.h
0 include path suggestion(s) discovered.

(this is a new header I just created inside the same folder as the header that works)

Checking for syntax errors: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/include/edo_hardware_interface/somefile.h
Checking for syntax errors: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/include/edo_hardware_interface/somefile.h
Checking for syntax errors: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/include/edo_hardware_interface/somefile.h
Checking for syntax errors: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/include/edo_hardware_interface/somefile.h

It seems to be searching over and over ...

[dbersan]

Also, we only shows errors for the currently open files, but it's possible a header file could be causing a parser error that is causing a cascading parse failure in the open files, so one potential thing to try is to use something like "g++ -E -std=c++17 > test.out.cpp" to generate a preprocessed file with no #includes and seeing if you see any IntelliSense errors with that file.

I'm not sure if I understood exactly,.. when I try that command passing a cpp file it can't find the headers, I'm not sure how to specify the header locations that are not relative (the ones installed on the system, written inside <> brackets).

ex:

g++ somefile.cpp -I. -E -std=c++17 > somefile.out

result:

somefile.h:3:10: fatal error: ros/ros.h: No such file or directory
 #include <ros/ros.h>
          ^~~~~~~~~~~

[sean-mcmanus]

So it sounds like someFile.h isn't getting IntelliSense (no squiggle for the missing include). That looks like a like #5923 that got fixed with 0.30.0-insiders2, but it looks like you have 0.30.0-insiders2 already. The "Checking for syntax error" is supposed to only happen after some edit or config change. If you enable "Debug" level logging you may be able to see what is triggering the multiple checks.

By "g++ ..." I meant to say you need to use whatever command line is required to build that particular file, so you may need to add -I or other flags, e.g. '-I /opt/ros/melodic/include`, etc.

[dbersan]

So it sounds like someFile.h isn't getting IntelliSense (no squiggle for the missing include). That looks like a like #5923 that got fixed with 0.30.0-insiders2, but it looks like you have 0.30.0-insiders2 already. The "Checking for syntax error" is supposed to only happen after some edit or config change. If you enable "Debug" level logging you may be able to see what is triggering the multiple checks.

By "g++ ..." I meant to say you need to use whatever command line is required to build that particular file, so you may need to add -I or other flags, e.g. '-I /opt/ros/melodic/include`, etc.

Yes I have this version

The log is extensive, but I will send it for the following cases

1) I type a variable and press ".", wait for auto complete (but don't get it):

textDocument/didChange: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp
cpptools/textEditorSelectionChange
textDocument/completion: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp (id: 1835)
auto_complete::handle_completion: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp (18:25)
Offering completion
sending 1 changes to server
cpptools/getFoldingRanges: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp (id: 1836)
cpptools/getCodeActions: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp (id: 1837)
cpptools/getSemanticTokens: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp (id: 1838)
cpptools/getDocumentSymbols: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp (id: 1839)
cpptools/getDocumentSymbols
Checking for syntax errors: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp
Queueing IntelliSense update for files in translation unit of: /home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp
  tag parsing file: /home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp
cpptools/finishUpdateSquiggles
Error squiggle count: 0
Update IntelliSense time (sec): 0.258
Database safe to open

2. Clean the output and type gibberish:

textDocument/didChange: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp
cpptools/textEditorSelectionChange
textDocument/didChange: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp
cpptools/textEditorSelectionChange
textDocument/completion: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp (id: 1847)
auto_complete::handle_completion: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp (18:27)
Offering completion
sending 1 changes to server
sending 1 changes to server
textDocument/didChange: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp
cpptools/textEditorSelectionChange
textDocument/didChange: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp
cpptools/textEditorSelectionChange
textDocument/didChange: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp
cpptools/textEditorSelectionChange
textDocument/completion: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp (id: 1848)
auto_complete::handle_completion: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp (18:30)
Offering completion
sending 1 changes to server
sending 1 changes to server
sending 1 changes to server
textDocument/didChange: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp
cpptools/textEditorSelectionChange
cpptools/getSemanticTokens: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp (id: 1849)
textDocument/didChange: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp
cpptools/textEditorSelectionChange
textDocument/didChange: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp
cpptools/textEditorSelectionChange
textDocument/didChange: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp
cpptools/textEditorSelectionChange
cpptools/getFoldingRanges: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp (id: 1850)
cpptools/getCodeActions: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp (id: 1851)
cpptools/getDocumentSymbols: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp (id: 1852)
cpptools/getDocumentSymbols
Checking for syntax errors: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp
Queueing IntelliSense update for files in translation unit of: /home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp
  tag parsing file: /home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp
sending 1 changes to server
sending 1 changes to server
sending 1 changes to server
sending 1 changes to server
cpptools/finishUpdateSquiggles
Error squiggle count: 0
Update IntelliSense time (sec): 0.259
cpptools/getSemanticTokens: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_driver.cpp (id: 1853)
Database safe to open

3. Same as (1), but with a working file:

textDocument/hover: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp (id: 1895)
Database safe to open
textDocument/didChange: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp
cpptools/textEditorSelectionChange
textDocument/completion: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp (id: 1896)
auto_complete::handle_completion: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp (33:13)
Offering completion
sending 1 changes to server
completionItem/resolve (id: 1897)
cpptools/getFoldingRanges: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp (id: 1898)
cpptools/getCodeActions: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp (id: 1899)
cpptools/getSemanticTokens: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp (id: 1900)
cpptools/getDocumentSymbols: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp (id: 1901)
cpptools/getDocumentSymbols

4. Same as (2), but with working file:
   

textDocument/didChange: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp
cpptools/textEditorSelectionChange
textDocument/completion: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp (id: 1944)
auto_complete::handle_completion: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp (33:14)
Offering completion
sending 1 changes to server
completionItem/resolve (id: 1945)
Request canceled: 1945
textDocument/didChange: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp
cpptools/textEditorSelectionChange
completionItem/resolve (id: 1946)
Request canceled: 1946
textDocument/didChange: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp
cpptools/textEditorSelectionChange
textDocument/didChange: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp
cpptools/textEditorSelectionChange
textDocument/completion: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp (id: 1947)
auto_complete::handle_completion: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp (33:17)
Offering completion
sending 1 changes to server
sending 1 changes to server
sending 1 changes to server
textDocument/didChange: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp
cpptools/textEditorSelectionChange
textDocument/completion: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp (id: 1948)
auto_complete::handle_completion: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp (33:18)
Offering completion
sending 1 changes to server
cpptools/getSemanticTokens: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp (id: 1949)
textDocument/didChange: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp
cpptools/textEditorSelectionChange
textDocument/completion: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp (id: 1950)
auto_complete::handle_completion: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp (33:19)
Offering completion
sending 1 changes to server
cpptools/getFoldingRanges: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp (id: 1951)
cpptools/getCodeActions: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp (id: 1952)
textDocument/hover: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp (id: 1953)
cpptools/getDocumentSymbols: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp (id: 1954)
cpptools/getDocumentSymbols
Checking for syntax errors: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp
Queueing IntelliSense update for files in translation unit of: /home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp
  tag parsing file: /home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp
cpptools/finishUpdateSquiggles
Error squiggle count: 3
Error squiggle count: 0
Update IntelliSense time (sec): 0.255
cpptools/getSemanticTokens: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp (id: 1955)
cpptools/getSemanticTokens: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/include/edo_hardware_interface/edo_hardware.h (id: 1956)
cpptools/getSemanticTokens: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/somefile.h (id: 1957)
cpptools/getCodeActions: file:///home/user/catkin_ws/src/MoveitArm-Example/edo_hardware_interface/src/edo_hardware_interface.cpp (id: 1958)
Database safe to open

[dbersan]

Not sure if this is helpful, I guess the best approach would be to find out why one file is working and the other isn't. Probably would be the headers? ..

[sean-mcmanus]

Yeah, nothing stands out in those logs as being an error. My guess is that an included but not opened header dependency is causing an IntelliSense parser failure (not a crash). So either the -E mechanism or manually using Go to Definition on the #includes may help locate the root parser failure.

Another possibility is there's an error with our IntelliSense cache files, so it would be worth temporarily changing C_Cpp.intelliSenseCacheSize to 0 and seeing if that fixes the issue.