Hi Dirk, Douglas,
Many thanks for your time in digging into this. I did some further
experiments yesterday and cut down the PROTECT()s a bit, but your
version below is much tidier. I confirm that your suggested code
SEXP cppExceptExpr = PROTECT(Rf_lang3(cppExceptSym,
Rf_mkString(exception_what.c_str()),
Rf_mkString(exception_class.c_str())));
Rf_eval(cppExceptExpr, R_FindNamespace(Rf_mkString("Rcpp"))); // Should
not return.
// Do this in case somehow someone replaces the definition of
// "cpp_exception" such that it does return:
UNPROTECT(1);
behaves correctly in my case. For completeness, the full text of the
forward_exception_to_r() function I now have is:
void forward_exception_to_r( const std::exception& ex){
std::string exception_class ;
std::string exception_what = ex.what();
const char *name = typeid(ex).name() ;
// now we need to demangle "name"
{
int status = -1;
char *dem = 0;
dem = abi::__cxa_demangle(name, 0, 0, &status);
if( status == 0){
exception_class = dem ; /* great we can use the demangled name */
free(dem);
} else{
exception_class = name ; /* just using the mangled name */
}
}
SEXP cppExceptSym = Rf_install("cpp_exception"); // cannot cause a gc()
once in symbol table
SEXP cppExceptExpr = PROTECT(Rf_lang3(cppExceptSym,
Rf_mkString(exception_what.c_str()),
Rf_mkString(exception_class.c_str())));
Rf_eval(cppExceptExpr, R_FindNamespace(Rf_mkString("Rcpp"))); // Should not
return.
// Do this in case somehow someone replaces the definition of
// "cpp_exception" such that it does return:
UNPROTECT(1);
}
(I did try using Rf_install() but as Douglas predicted, this creates a
symbol rather than a string, and cpp_exception doesn't like this.)
I am now seeing another strange error under gctorture() which I might try
to track down further, and will report back if it looks like Rcpp rather
than my code.
Thanks,
Ben.
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