[clang++] Crash using C++ modules

[olizit]

Crash when using pointer to member function

Model-0f3e90.cppm.log
Model-0f3e90.sh.log

[build] 1.	<eof> parser at end of file
[build] 2.	C:\Dev\DemoApp\src\events\Property.cppm:6:7: LLVM IR generation of declaration 'Property'
[build] Exception Code: 0xC0000005
[build]  #0 0x00007ff69f768f17 (C:\Program Files\LLVM\bin\clang++.exe+0x17e8f17)
[build]  #1 0x00007ff69e16a953 (C:\Program Files\LLVM\bin\clang++.exe+0x1ea953)
[build]  #2 0x00007ff69f7634d4 (C:\Program Files\LLVM\bin\clang++.exe+0x17e34d4)
[build]  #3 0x00007ff69f75a89a (C:\Program Files\LLVM\bin\clang++.exe+0x17da89a)
[build]  #4 0x00007ff69f764f8d (C:\Program Files\LLVM\bin\clang++.exe+0x17e4f8d)
[build]  #5 0x00007ff69f98b58e (C:\Program Files\LLVM\bin\clang++.exe+0x1a0b58e)
[build]  #6 0x00007ff69e9927d5 (C:\Program Files\LLVM\bin\clang++.exe+0xa127d5)
[build]  #7 0x00007ff6a069c2ec (C:\Program Files\LLVM\bin\clang++.exe+0x271c2ec)
[build]  #8 0x00007ff6a06a6d4b (C:\Program Files\LLVM\bin\clang++.exe+0x2726d4b)
[build]  #9 0x00007ff6a06a31c8 (C:\Program Files\LLVM\bin\clang++.exe+0x27231c8)
[build] #10 0x00007ff6a06a2b32 (C:\Program Files\LLVM\bin\clang++.exe+0x2722b32)
[build] #11 0x00007ff6a06a2aa9 (C:\Program Files\LLVM\bin\clang++.exe+0x2722aa9)
[build] #12 0x00007ff6a06a0ad5 (C:\Program Files\LLVM\bin\clang++.exe+0x2720ad5)
[build] #13 0x00007ff69f61d328 (C:\Program Files\LLVM\bin\clang++.exe+0x169d328)
[build] #14 0x00007ff69ff204bc (C:\Program Files\LLVM\bin\clang++.exe+0x1fa04bc)
[build] #15 0x00007ff69ff12d3f (C:\Program Files\LLVM\bin\clang++.exe+0x1f92d3f)
[build] #16 0x00007ff6a15f0e90 (C:\Program Files\LLVM\bin\clang++.exe+0x3670e90)
[build] #17 0x00007ff6a08ae4e1 (C:\Program Files\LLVM\bin\clang++.exe+0x292e4e1)
[build] #18 0x00007ff69fea6e84 (C:\Program Files\LLVM\bin\clang++.exe+0x1f26e84)
[build] #19 0x00007ff69e5a9453 (C:\Program Files\LLVM\bin\clang++.exe+0x629453)
[build] #20 0x00007ff69e5a909d (C:\Program Files\LLVM\bin\clang++.exe+0x62909d)
[build] #21 0x00007ff69e5a5d56 (C:\Program Files\LLVM\bin\clang++.exe+0x625d56)
[build] #22 0x00007ff69e5a28b8 (C:\Program Files\LLVM\bin\clang++.exe+0x6228b8)
[build] #23 0x00007ff69e5a114e (C:\Program Files\LLVM\bin\clang++.exe+0x62114e)
[build] #24 0x00007ff69e44c50a (C:\Program Files\LLVM\bin\clang++.exe+0x4cc50a)
[build] #25 0x00007ff69e448dc3 (C:\Program Files\LLVM\bin\clang++.exe+0x4c8dc3)
[build] #26 0x00007ff69ff6c890 (C:\Program Files\LLVM\bin\clang++.exe+0x1fec890)
[build] #27 0x00007ffff094e8d7 (C:\WINDOWS\System32\KERNEL32.DLL+0x2e8d7)
[build] #28 0x00007ffff2b3bf2c (C:\WINDOWS\SYSTEM32\ntdll.dll+0xbbf2c)
[build] clang++: error: clang frontend command failed due to signal (use -v to see invocation)
[build] clang version 21.1.2
[build] Target: x86_64-pc-windows-msvc
[build] Thread model: posix
[build] InstalledDir: C:\Program Files\LLVM\bin
[build] clang++: note: diagnostic msg: 
[build] ********************
[build] 
[build] PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
[build] Preprocessed source(s) and associated run script(s) are located at:
[build] clang++: note: diagnostic msg: C:\Users\OLIVIE~1.PEL\AppData\Local\Temp\Model-0f3e90.cppm
[build] clang++: note: diagnostic msg: C:\Users\OLIVIE~1.PEL\AppData\Local\Temp\Model-0f3e90.sh
[build] clang++: note: diagnostic msg: 
[build] 
[build] ********************

Step to reproduce with reduce sample:

1. Define first module:

// In module1.cppm file
export module module1;

export class IFunc
{
public:
  virtual ~IFunc() = default;

public:
  virtual void firstFunc(double val) = 0;
};

2. Define second module:

// In module2.cppm file
export module module2;

import module1;

export void Consume(IFunc * object)
{
  double d{2.1};
  auto func = &IFunc::firstFunc;
  (object->*func)(d);
}

Arguments and result backtrace:

Stack dump:
0.      Program arguments: "C:\\Program Files\\LLVM\\bin\\clang++.exe" -cc1 -triple x86_64-pc-windows-msvc19.39.33521 -O0 -emit-obj -mincremental-linker-compatible -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name module2.cppm -mrelocation-model pic -pic-level 2 -mframe-pointer=none -relaxed-aliasing -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -fms-volatile -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -gno-column-info -gcodeview -debug-info-kind=constructor -fdebug-compilation-dir=C:\\Dev\\Build\\DemoApp\\Debug -object-file-name=C:\\Dev\\Build\\DemoApp\\Debug\\CMakeFiles\\DemoAppExe.dir\\example\\module2.cppm.obj -fcoverage-compilation-dir=C:\\Dev\\Build\\DemoApp\\Debug -resource-dir "C:\\Program Files\\LLVM\\lib\\clang\\21" -std=c++23 -fdeprecated-macro -ferror-limit 19 -fno-use-cxa-atexit -fms-extensions -fms-compatibility -fms-compatibility-version=19.39.33521 -fno-implicit-modules -fmodule-file=module1=CMakeFiles/DemoAppExe.dir/module1.pcm -fskip-odr-check-in-gmf -fcxx-exceptions -fexceptions --dependent-lib=msvcrtd -gcodeview -faddrsig -o CMakeFiles/DemoAppExe.dir/example/module2.cppm.obj -x pcm CMakeFiles/DemoAppExe.dir/module2.pcm
1.      <eof> parser at end of file
2.      C:\Dev\DemoApp\example\module2.cppm:5:13: LLVM IR generation of declaration 'Consume'
3.      C:\Dev\DemoApp\example\module2.cppm:5:13: Generating code for declaration 'Consume'
Exception Code: 0xC0000005
 #0 0x00007ff6916d8f17 (C:\Program Files\LLVM\bin\clang++.exe+0x17e8f17)
 #1 0x00007ff68ff545df (C:\Program Files\LLVM\bin\clang++.exe+0x645df)
 #2 0x00007ff691941d41 (C:\Program Files\LLVM\bin\clang++.exe+0x1a51d41)
 #3 0x00007ff68ff01856 (C:\Program Files\LLVM\bin\clang++.exe+0x11856)
 #4 0x00007ff691109fb6 (C:\Program Files\LLVM\bin\clang++.exe+0x1219fb6)
 #5 0x00007ff68ff00c6d (C:\Program Files\LLVM\bin\clang++.exe+0x10c6d)
 #6 0x00007ff68fefeefb (C:\Program Files\LLVM\bin\clang++.exe+0xeefb)
 #7 0x00007ff691102109 (C:\Program Files\LLVM\bin\clang++.exe+0x1212109)
 #8 0x00007ff6910ffbee (C:\Program Files\LLVM\bin\clang++.exe+0x120fbee)
 #9 0x00007ff6910ff73e (C:\Program Files\LLVM\bin\clang++.exe+0x120f73e)
#10 0x00007ff6910fdd55 (C:\Program Files\LLVM\bin\clang++.exe+0x120dd55)
#11 0x00007ff6910fb78e (C:\Program Files\LLVM\bin\clang++.exe+0x120b78e)
#12 0x00007ff6910fad0d (C:\Program Files\LLVM\bin\clang++.exe+0x120ad0d)
#13 0x00007ff69158f9d7 (C:\Program Files\LLVM\bin\clang++.exe+0x169f9d7)
#14 0x00007ff69158c5b2 (C:\Program Files\LLVM\bin\clang++.exe+0x169c5b2)
#15 0x00007ff691e904bc (C:\Program Files\LLVM\bin\clang++.exe+0x1fa04bc)
#16 0x00007ff691e82d3f (C:\Program Files\LLVM\bin\clang++.exe+0x1f92d3f)
#17 0x00007ff693560e90 (C:\Program Files\LLVM\bin\clang++.exe+0x3670e90)
#18 0x00007ff69281e4e1 (C:\Program Files\LLVM\bin\clang++.exe+0x292e4e1)
#19 0x00007ff691e16e84 (C:\Program Files\LLVM\bin\clang++.exe+0x1f26e84)
#20 0x00007ff690519453 (C:\Program Files\LLVM\bin\clang++.exe+0x629453)
#21 0x00007ff69051909d (C:\Program Files\LLVM\bin\clang++.exe+0x62909d)
#22 0x00007ff690515d56 (C:\Program Files\LLVM\bin\clang++.exe+0x625d56)
#23 0x00007ff6905128b8 (C:\Program Files\LLVM\bin\clang++.exe+0x6228b8)
#24 0x00007ff69051114e (C:\Program Files\LLVM\bin\clang++.exe+0x62114e)
#25 0x00007ff6903bc50a (C:\Program Files\LLVM\bin\clang++.exe+0x4cc50a)
#26 0x00007ff6903b8dc3 (C:\Program Files\LLVM\bin\clang++.exe+0x4c8dc3)
#27 0x00007ff691edc890 (C:\Program Files\LLVM\bin\clang++.exe+0x1fec890)
#28 0x00007ffff094e8d7 (C:\WINDOWS\System32\KERNEL32.DLL+0x2e8d7)
#29 0x00007ffff2b3bf2c (C:\WINDOWS\SYSTEM32\ntdll.dll+0xbbf2c)
clang++: error: clang frontend command failed due to signal (use -v to see invocation)
clang version 21.1.2
Target: x86_64-pc-windows-msvc
Thread model: posix
InstalledDir: C:\Program Files\LLVM\bin
clang++: note: diagnostic msg:
********************

PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
Preprocessed source(s) and associated run script(s) are located at:
clang++: note: diagnostic msg: C:\Users\OLIVIE~1.PEL\AppData\Local\Temp\module2-d17ad9.cppm
clang++: note: diagnostic msg: C:\Users\OLIVIE~1.PEL\AppData\Local\Temp\module2-d17ad9.sh
clang++: note: diagnostic msg:

********************

Log files:
module2-93f56c.cppm.log
module2-93f56c.sh.log

Regression status:
LLVM v19.1.1: failed
LLVM v18.1.8: failed

[llvmbot]

@llvm/issue-subscribers-clang-modules

Author: Olivier (olizit)

[Model-0f3e90.cppm.log](https://github.com/user-attachments/files/22558108/Model-0f3e90.cppm.log)

Model-0f3e90.sh.log

Crash when using pointer to member function

[build] 1.	<eof> parser at end of file
[build] 2.	C:\Dev\DemoApp\src\events\Property.cppm:6:7: LLVM IR generation of declaration 'Property'
[build] Exception Code: 0xC0000005
[build]  #<!-- -->0 0x00007ff69f768f17 (C:\Program Files\LLVM\bin\clang++.exe+0x17e8f17)
[build]  #<!-- -->1 0x00007ff69e16a953 (C:\Program Files\LLVM\bin\clang++.exe+0x1ea953)
[build]  #<!-- -->2 0x00007ff69f7634d4 (C:\Program Files\LLVM\bin\clang++.exe+0x17e34d4)
[build]  #<!-- -->3 0x00007ff69f75a89a (C:\Program Files\LLVM\bin\clang++.exe+0x17da89a)
[build]  #<!-- -->4 0x00007ff69f764f8d (C:\Program Files\LLVM\bin\clang++.exe+0x17e4f8d)
[build]  #<!-- -->5 0x00007ff69f98b58e (C:\Program Files\LLVM\bin\clang++.exe+0x1a0b58e)
[build]  #<!-- -->6 0x00007ff69e9927d5 (C:\Program Files\LLVM\bin\clang++.exe+0xa127d5)
[build]  #<!-- -->7 0x00007ff6a069c2ec (C:\Program Files\LLVM\bin\clang++.exe+0x271c2ec)
[build]  #<!-- -->8 0x00007ff6a06a6d4b (C:\Program Files\LLVM\bin\clang++.exe+0x2726d4b)
[build]  #<!-- -->9 0x00007ff6a06a31c8 (C:\Program Files\LLVM\bin\clang++.exe+0x27231c8)
[build] #<!-- -->10 0x00007ff6a06a2b32 (C:\Program Files\LLVM\bin\clang++.exe+0x2722b32)
[build] #<!-- -->11 0x00007ff6a06a2aa9 (C:\Program Files\LLVM\bin\clang++.exe+0x2722aa9)
[build] #<!-- -->12 0x00007ff6a06a0ad5 (C:\Program Files\LLVM\bin\clang++.exe+0x2720ad5)
[build] #<!-- -->13 0x00007ff69f61d328 (C:\Program Files\LLVM\bin\clang++.exe+0x169d328)
[build] #<!-- -->14 0x00007ff69ff204bc (C:\Program Files\LLVM\bin\clang++.exe+0x1fa04bc)
[build] #<!-- -->15 0x00007ff69ff12d3f (C:\Program Files\LLVM\bin\clang++.exe+0x1f92d3f)
[build] #<!-- -->16 0x00007ff6a15f0e90 (C:\Program Files\LLVM\bin\clang++.exe+0x3670e90)
[build] #<!-- -->17 0x00007ff6a08ae4e1 (C:\Program Files\LLVM\bin\clang++.exe+0x292e4e1)
[build] #<!-- -->18 0x00007ff69fea6e84 (C:\Program Files\LLVM\bin\clang++.exe+0x1f26e84)
[build] #<!-- -->19 0x00007ff69e5a9453 (C:\Program Files\LLVM\bin\clang++.exe+0x629453)
[build] #<!-- -->20 0x00007ff69e5a909d (C:\Program Files\LLVM\bin\clang++.exe+0x62909d)
[build] #<!-- -->21 0x00007ff69e5a5d56 (C:\Program Files\LLVM\bin\clang++.exe+0x625d56)
[build] #<!-- -->22 0x00007ff69e5a28b8 (C:\Program Files\LLVM\bin\clang++.exe+0x6228b8)
[build] #<!-- -->23 0x00007ff69e5a114e (C:\Program Files\LLVM\bin\clang++.exe+0x62114e)
[build] #<!-- -->24 0x00007ff69e44c50a (C:\Program Files\LLVM\bin\clang++.exe+0x4cc50a)
[build] #<!-- -->25 0x00007ff69e448dc3 (C:\Program Files\LLVM\bin\clang++.exe+0x4c8dc3)
[build] #<!-- -->26 0x00007ff69ff6c890 (C:\Program Files\LLVM\bin\clang++.exe+0x1fec890)
[build] #<!-- -->27 0x00007ffff094e8d7 (C:\WINDOWS\System32\KERNEL32.DLL+0x2e8d7)
[build] #<!-- -->28 0x00007ffff2b3bf2c (C:\WINDOWS\SYSTEM32\ntdll.dll+0xbbf2c)
[build] clang++: error: clang frontend command failed due to signal (use -v to see invocation)
[build] clang version 21.1.2
[build] Target: x86_64-pc-windows-msvc
[build] Thread model: posix
[build] InstalledDir: C:\Program Files\LLVM\bin
[build] clang++: note: diagnostic msg: 
[build] ********************
[build] 
[build] PLEASE ATTACH THE FOLLOWING FILES TO THE BUG REPORT:
[build] Preprocessed source(s) and associated run script(s) are located at:
[build] clang++: note: diagnostic msg: C:\Users\OLIVIE~1.PEL\AppData\Local\Temp\Model-0f3e90.cppm
[build] clang++: note: diagnostic msg: C:\Users\OLIVIE~1.PEL\AppData\Local\Temp\Model-0f3e90.sh
[build] clang++: note: diagnostic msg: 
[build] 
[build] ********************

[ChuanqiXu9]

It is better to asserted clang to give more information. And it will be helpful to test with trunk and previous version. If it doesn't occur with previous version, this is a regression. We can find the commit introduces the regression.

Finally, it will be much better to provide a reduced example.

[olizit]

Ticket modified with a reduce example with sample code and log files.

[ChuanqiXu9]

Can you test with trunk and enable assertions? And it will be helpful to get rid of headers like <functional>

[olizit]

Ticket modified without headers and add regression status

[ChuanqiXu9]

Ticket modified without headers and add regression status

This is not valid:

// In module2.cppm file
export module module2;

import module1;

export void Consume(IFunc & func)
{
  double d{2.1};
  auto func = &IFunc::firstFunc;
  (object->*func)(d);
}

func redefined and object not defined.

[olizit]

Oupps sorry wrong copy paste. It's fixed now