// return location at which the exception <er> occurred.
// params: see debug_ResolveSymbol.
static void GetExceptionLocus(EXCEPTION_POINTERS* ep,
wchar_t* file, int* line, wchar_t* func)
{
// HACK: <ep> provides no useful information - ExceptionAddress always
// points to kernel32!RaiseException. we use debug_GetCaller to
// determine the real location.
const wchar_t* const lastFuncToSkip = L"RaiseException";
void* func_addr = debug_GetCaller(ep->ContextRecord, lastFuncToSkip);
(void)debug_ResolveSymbol(func_addr, func, file, line);
}
Status debug_DumpStack(wchar_t* buf, size_t max_chars, void* UNUSED(context), const wchar_t* UNUSED(lastFuncToSkip))
{
static const size_t N_FRAMES = 16;
void *bt[N_FRAMES];
int bt_size = 0;
wchar_t *bufpos = buf;
wchar_t *bufend = buf + max_chars;
bt_size = backtrace(bt, ARRAY_SIZE(bt));
// Assumed max length of a single print-out
static const size_t MAX_OUT_CHARS = 1024;
for (size_t i = 0; (int)i < bt_size && bufpos+MAX_OUT_CHARS < bufend; i++)
{
wchar_t file[DEBUG_FILE_CHARS];
wchar_t symbol[DEBUG_SYMBOL_CHARS];
int line;
int len;
if (debug_ResolveSymbol(bt[i], symbol, file, &line) == 0)
{
if (file[0])
len = swprintf(bufpos, MAX_OUT_CHARS, L"(%p) %ls:%d %ls\n", bt[i], file, line, symbol);
else
len = swprintf(bufpos, MAX_OUT_CHARS, L"(%p) %ls\n", bt[i], symbol);
}
else
{
len = swprintf(bufpos, MAX_OUT_CHARS, L"(%p)\n", bt[i]);
}
if (len < 0)
{
// MAX_OUT_CHARS exceeded, realistically this was caused by some
// mindbogglingly long symbol name... replace the end with an
// ellipsis and a newline
memcpy(&bufpos[MAX_OUT_CHARS-6], L"...\n", 5*sizeof(wchar_t));
len = MAX_OUT_CHARS;
}
bufpos += len;
}
return INFO::OK;
}
