#429 debug windows 32bit program with cdb 64bit

[Debugfan Chin]

Codeblocks hung alway when debugged windows 32bit program with 64bit cdb. I found the reason that causes this problem by debugging: The command prompt is the form like "0:000:x86>" when debugging 32bit program with 64bit cdb, but the form codeblocks expects is like "0:000>".

[Teodor Petrov]

Good, but this patch breaks the original case when using 32bit cdb.
Would you be kind enough to provide a patch that works in both cases?
I'm mostly using linux, so cannot test this easily.

[Debugfan Chin]

Thanks for replying so quick. I have tested the patched version with 64bit cdb on my windows 7 and 32bit cdb on my windows xp in virtual machine. they both work. the original regex match for cdb promt is:

wxRegEx rePrompt(_T("([0-9]+:){1,2}[0-9]+>"))

the patched version is:

static wxRegEx rePrompt(_T("([0-9]+:){1,2}[0-9]+(:x86)?>"));

the patched version matches string "x86" 0 or 1 times, so it work with 64bit, and is compatible with 32bit.
I found another problem with cdb in the original version existed and described in the ticket #430. To make cdb work completely, I hope applying those two patches.

[Teodor Petrov]

Can you show me some output from both versions, so I can add some tests?

FYI: There is a separate project to create a better CDB debugger plugin. You can try it and see if it works better.

[Debugfan Chin]

32bit cdb output is as follow:

C:\Documents and Settings\anonymous>C:\WinDDK\7600.16385.1\Debuggers\cdb.exe -G
-lines -2 -y C:/projects/test/; -srcpath C:/projects/test/; C:/projects/test/bin
/Debug/test.exe

Microsoft (R) Windows Debugger Version 6.12.0002.633 X86
Copyright (c) Microsoft Corporation. All rights reserved.

CommandLine: C:/projects/test/bin/Debug/test.exe
Symbol search path is: C:/projects/test/
Executable search path is:
ModLoad: 00400000 00407000   test.exe
ModLoad: 7c920000 7c9b3000   ntdll.dll
ModLoad: 7c800000 7c91e000   C:\WINDOWS\system32\kernel32.dll
ModLoad: 10200000 1026c000   C:\WINDOWS\system32\MSVCRTD.dll
ModLoad: 10480000 104fe000   C:\WINDOWS\system32\MSVCP60D.dll
(4f8.4cc): Break instruction exception - code 80000003 (first chance)
eax=00241eb4 ebx=7ffdf000 ecx=00000004 edx=00000010 esi=00241f48 edi=00241eb4
eip=7c92120e esp=0012fb20 ebp=0012fc94 iopl=0         nv up ei pl nz na po nc
cs=001b  ss=0023  ds=0023  es=0023  fs=003b  gs=0000             efl=00000202
*** ERROR: Symbol file could not be found.  Defaulted to export symbols for ntdl
l.dll -
ntdll!DbgBreakPoint:
7c92120e cc              int     3
0:000>

64bit cdb will encounter two breakpoints after load. The first is as follow:

C:\Users\Administrator>D:\WinDDK\7600.16385.1\Debuggers\cdb.exe -G -lines -2 -y
D:/chateau/projects/dbgtest/; -srcpath D:/chateau/projects/dbgtest/; D:/chateau/
projects/dbgtest/bin/Debug/dbgtest.exe

Microsoft (R) Windows Debugger Version 6.12.0002.633 AMD64
Copyright (c) Microsoft Corporation. All rights reserved.

CommandLine: D:/chateau/projects/dbgtest/bin/Debug/dbgtest.exe
Symbol search path is: D:/chateau/projects/dbgtest/
Executable search path is:
ModLoad: 00000000`00400000 00000000`00407000   dbgtest.exe
ModLoad: 00000000`772e0000 00000000`7748a000   ntdll.dll
ModLoad: 00000000`774c0000 00000000`77640000   ntdll32.dll
ModLoad: 00000000`748c0000 00000000`748ff000   C:\Windows\SYSTEM32\wow64.dll
ModLoad: 00000000`74860000 00000000`748bc000   C:\Windows\SYSTEM32\wow64win.dll
ModLoad: 00000000`74850000 00000000`74858000   C:\Windows\SYSTEM32\wow64cpu.dll
(193c.2044): Break instruction exception - code 80000003 (first chance)
*** ERROR: Symbol file could not be found.  Defaulted to export symbols for ntdl
l.dll -
ntdll!CsrSetPriorityClass+0x40:
00000000`77387800 cc              int     3
0:000>

Input command 'g' to continue. It will encounter the second breakpoint as follow:

ModLoad: 00000000`74850000 00000000`74858000   C:\Windows\SYSTEM32\wow64cpu.dll
(193c.2044): Break instruction exception - code 80000003 (first chance)
*** ERROR: Symbol file could not be found.  Defaulted to export symbols for ntdl
l.dll -
ntdll!CsrSetPriorityClass+0x40:
00000000`77387800 cc              int     3
0:000> g
ModLoad: 00000000`77080000 00000000`7719f000   WOW64_IMAGE_SECTION
ModLoad: 00000000`76520000 00000000`76630000   WOW64_IMAGE_SECTION
ModLoad: 00000000`77080000 00000000`7719f000   NOT_AN_IMAGE
ModLoad: 00000000`76f80000 00000000`7707a000   NOT_AN_IMAGE
ModLoad: 00000000`76520000 00000000`76630000   C:\Windows\syswow64\kernel32.dll
ModLoad: 00000000`76d40000 00000000`76d87000   C:\Windows\syswow64\KERNELBASE.dl
l
ModLoad: 00000000`10200000 00000000`1026c000   C:\Windows\SysWOW64\MSVCRTD.dll
ModLoad: 00000000`10480000 00000000`104fe000   C:\Windows\SysWOW64\MSVCP60D.dll
(193c.2044): WOW64 breakpoint - code 4000001f (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
*** ERROR: Symbol file could not be found.  Defaulted to export symbols for ntdl
l32.dll -
ntdll32!LdrVerifyImageMatchesChecksum+0xf1f:
77560e14 cc              int     3
0:000:x86>

This time causes the problem, and so the after do. The same problem has been described before in
http://wiki.codeblocks.org/index.php?title=Debugging_with_Code::Blocks#Use_32bit_CDB_for_32bit_programs_and_64bit_CDB_for_64bit_programs
and http://forums.codeblocks.org/index.php?topic=19372.0.
The compromised solution is using 32bit cdb instead of 64bit. But my 64bit debugger in WDK is used for other development, and I don't want to install 32bit instead of it. so I made the patch after found the reason that caused this problem.

[Teodor Petrov]

Applied in svn. Thanks for contribution.