Source code of Windows XP (NT5)
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//*** dbutil.cpp -- debug helpers
// DESCRIPTION
// this file has the shared-source 'master' implementation. it is
// #included in each DLL that uses it.
// clients do something like:
// #include "priv.h" // for types, ASSERT, DM_*, DF_*, etc.
// #include "../lib/dbutil.cpp"
#ifdef DEBUG // {
#if ( _X86_)
// warning: these macros assume we have an ebp-linked chain. for debug we do.
#define BP_GETOLDBP(pbp) (*((int *)(pbp) + 0))
#define BP_GETRET(pbp) (*((int *)(pbp) + 1))
//*** DBGetStackBack -- walk stack frame
// #if 0 w/ sanity checks #endif
// ENTRY/EXIT
// pfp INOUT ptr to frame ptr (IN:starting, OUT:ending)
// pstkback OUT:fp/ret pairs, IN:optional size/addr pairs for sanity check
// nstkback ARRAYSIZE(pstckback)
// #if 0
// ncheck # of IN pstkback size/addr sanity-check pairs
// #endif
// n (return) # of frames successfully walked
// DESCRIPTION
// fills in OUT pstckback w/ backtrace info for nstckback frames.
// #if 0
// if ncheck > 0, makes sure that initial backtrace entries are in the
// range of the function specified by the IN size/addr pairs in pstkback.
// #endif
// NOTES
// not sure if we return the right pfp' value (untested)
int DBGetStackBack(int *pfp, struct DBstkback *pstkback, int nstkback /*,int nchk*/)
{
int fp = *pfp;
int ret;
int i = 0;
__try {
for (; i < nstkback; i++, pstkback++) {
ret = BP_GETRET(fp);
#if 0
if (i < ncheck && pstkback->ret != 0) {
ASSERT(pstkback->fp == 0 || pstkback->fp == -1 || pstkback->fp <= 512);
if (!(pstkback->ret <= ret && ret <= pstkback->ret + pstkback->fp)) {
// constraint violated
break;
}
}
#endif
fp = BP_GETOLDBP(fp);
pstkback->ret = ret;
pstkback->fp = fp;
}
}
__except(EXCEPTION_EXECUTE_HANDLER) {
TraceMsg(TF_ALWAYS, "atm: GPF");
// just use last 'ret' we had
}
*pfp = fp;
return i;
}
#endif
#endif // }