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
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