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