Your technique could fail this way if there is some complex code following the call to FJit_pHlpMyTest in the helper. The helper frame interpreter needs to interpret its way out into the jitted code. If you want to know more details, read the "How FCall works" paragraph in clr\src\vm\fcall.h.
I do not see why there could be a problem in the example you gave. The helper frame interpreter should be able to go through the code generated by "*((int*) ((char*)(or_obj)+offset)) = val;". If you give me exact steps to reproduce the problem (the version and edition of the compiler you are using, the test you are getting this failure with, etc.), I can take a look. -Jan This posting is provided "AS IS" with no warranties, and confers no rights. -----Original Message----- From: Discussion of the Rotor Shared Source CLI implementation [mailto:[EMAIL PROTECTED] On Behalf Of Yuan Yu Sent: Friday, January 23, 2004 10:27 AM To: [EMAIL PROTECTED] Subject: [DOTNET-ROTOR] Stacktrace Sometimes, I'd like to print out the stack trace inside a jit helper. As an example, I tried it on HELPER_CALL STFLD_I4_helper in fjit\fjitdef.h: void HELPER_CALL STFLD_I4_helper(unsigned int offset, int val, CORINFO_Object* or_obj) { if (or_obj == NULL) { THROW_FROM_HELPER(CORINFO_NullReferenceException); } // Added to print stack trace: FJit_pHlpMyTest(NULL); *((int*) ((char*)(or_obj)+offset)) = val; } As a first cut, I wanted to call PrintStackTraceToStdout() in vm\debughelp.cpp. To do that, I defined the following function in vm\jitinterface.cpp: HCIMPL1(void, JIT_MyTest, void* arg) { HELPER_METHOD_FRAME_BEGIN_0(); printf("My test to print stack trace.\n"); void PrintStackTraceToStdout(); PrintStackTraceToStdout(); HELPER_METHOD_FRAME_END(); } HCIMPLEND And then made the needed changes in inc\corinfo.h, fjit\fjit.h, and fjit\fjitcompiler.cpp so that my function could be called in fjit\fjitdef.h. It compiled successfully. However, when I tried it on some simple c# programs, it failed with the following message: Assert failure(PID 5220 [0x00001464], Thread: 4876 [0x130c]): !"Bad opcode" File: c:\yuan\proj\rotor\sscli-0\clr\src\vm\rotor_x86 \../i386/gmsx86.cpp, Line: 533 Image: What did I do wrong? Thanks, -Yuan =================================== This list is hosted by DevelopMentor(r) http://www.develop.com NEW! ASP.NET courses you may be interested in: 2 Days of ASP.NET, 29 Sept 2003, in Redmond http://www.develop.com/courses/2daspdotnet Guerrilla ASP.NET, 13 Oct 2003, in Boston http://www.develop.com/courses/gaspdotnet View archives and manage your subscription(s) at http://discuss.develop.com =================================== This list is hosted by DevelopMentorŪ http://www.develop.com NEW! ASP.NET courses you may be interested in: 2 Days of ASP.NET, 29 Sept 2003, in Redmond http://www.develop.com/courses/2daspdotnet Guerrilla ASP.NET, 13 Oct 2003, in Boston http://www.develop.com/courses/gaspdotnet View archives and manage your subscription(s) at http://discuss.develop.com
