-x objective-c throws System.ArgumentNullException

[Dadoum]

How bug is triggered

A code snipet:

var index = ClangService.CreateIndex();
     var trans = index.ParseTranslationUnit(objectivecfile, args, //that are actually containing "-x objective-c"
    null, 
    TranslationUnitFlags.SingleFileParse);

What does it outputs ?

Value cannot be null. Parameter name: handle

Stacktrace:

  at NClang.ClangObject..ctor (System.IntPtr handle) [0x00017] in <8ad3b26ee11343b1bd9b256eebdaec77>:0 
  at NClang.ClangTranslationUnit..ctor (System.IntPtr handle) [0x00000] in <8ad3b26ee11343b1bd9b256eebdaec77>:0 
  at NClang.ClangIndex.ParseTranslationUnit (System.String sourceFilename, System.String[] commandLineArgs, NClang.ClangUnsavedFile[] unsavedFiles, NClang.TranslationUnitFlags options) [0x00056] in <8ad3b26ee11343b1bd9b256eebdaec77>:0 
  at DemoCodeSnippet.Trigger [0x0005c] in the path of the file 
  at System.Threading.ThreadHelper.ThreadStart_Context (System.Object state) [0x00025] in <285579f54af44a2ca048dad6be20e190>:0 
  at System.Threading.ExecutionContext.RunInternal (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state, System.Boolean preserveSyncCtx) [0x00071] in <285579f54af44a2ca048dad6be20e190>:0 
  at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state, System.Boolean preserveSyncCtx) [0x00000] in <285579f54af44a2ca048dad6be20e190>:0 
  at System.Threading.ExecutionContext.Run (System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, System.Object state) [0x0002b] in <285579f54af44a2ca048dad6be20e190>:0 
  at System.Threading.ThreadHelper.ThreadStart (System.Object obj) [0x0000f] in <285579f54af44a2ca048dad6be20e190>:0 

System configuration:

OS : Linux x64, Ubuntu derrivatives - KUbuntu 19.04

[atsushieno]

Thanks for the report. Unfortunately I could not reproduce the issue. I tried what you explained above but it was successful:

/sources/nclang/NClang/bin/Debug/net462$ ls
NClang.dll  NClang.pdb  sample.m  x.cs  x.exe
/sources/nclang/NClang/bin/Debug/net462$ cat x.cs
using System;
using NClang;

public class Driver
{
	public static void Main (string [] args)
	{
		var index = ClangService.CreateIndex();
		var trans = index.ParseTranslationUnit("sample.m", args, null, TranslationUnitFlags.SingleFileParse);
	}
}

/sources/nclang/NClang/bin/Debug/net462$ csc x.cs -r:NClang.dll
Microsoft (R) Visual C# Compiler version 3.4.0-beta4-19569-03 (82f2e254)
Copyright (C) Microsoft Corporation. All rights reserved.

/sources/nclang/NClang/bin/Debug/net462$ mono x.exe -x objective-c
/sources/nclang/NClang/bin/Debug/net462$ cat sample.m
#import <Foundation/Foundation.h>

int main (int argc, const char * argv[]) {
   NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

   NSLog (@"hello world");
   [pool drain];
   return 0;
}

Could you please provide more specific repro steps, and/or check that the above works for you? Thanks.

[Dadoum]

AnotherTry.tar.gz Here is a sample that triggers the bug, (It could be triggered by iPhoneSDK maybe) And "-x objective-c" is given in one argument else it outputs error unable to build module Foundation

[atsushieno]

The execution result would depend on the environment as I'm running this on Linux but you want to use modern ParseTranslationUnit() overload:

        ClangTranslationUnit tu;
        var errors = index.ParseTranslationUnit("Sample.m", Flags, null, TranslationUnitFlags.SingleFileParse, out tu);
        Console.WriteLine (errors);

It resulted in ASTReadError for me.

[Dadoum]

Same for me it results to an ASTReadError (and I'm on Linux, Kubuntu as I said before)

[atsushieno]

I mean, the result is expected.

Try with the actual clang and see what it says:

~/Desktop/AnotherTry/bin/Debug$ cat Sample.m 
#import <Foundation/Foundation.h>

int main (int argc, const char * argv[]) {
   NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];

   NSLog (@"hello world");
   [pool drain];
   return 0;
}~/Desktop/AnotherTry/bin/Debug$ clang -x objective-c Sample.m 
Sample.m:1:9: fatal error: 'Foundation/Foundation.h' file not found
#import <Foundation/Foundation.h>
        ^~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.

[Dadoum]

clang -target ./target/arm64-apple-darwin14 -arch arm64 -x objective-c -fmodules -isysroot ./sdk/ Sample.m works itself while the sample given before with

static string[] Flags =
    { 
            "-target " + Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), "target/arm64-apple-darwin14"),
            "-isysroot " + Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), "sdk"),
            "-fmodules",
            "-x objective-c",
    };

with Debug.tar.gz doesn't work and fail

[atsushieno]

This does not seem to be runnable:

~/Desktop/AnotherTry/bin/Debug$ clang -target ./target/arm64-apple-darwin14 -arch arm64 -x objective-c -fmodules -isysroot ./sdk/ Sample.m
./target/arm64-apple-darwin14-ld: error while loading shared libraries: libtapi.so: cannot open shared object file: No such file or directory

[Dadoum]

This is because I installed libtapi on my computer, there it is in https://kabiroberai.com/toolchain/download.php?toolchain=ios-linux