[Rcpp-devel] Missing PROTECT()s in forward_exception_to_r()?
Ben.North at sig.com
Mon Oct 8 12:24:51 CEST 2012
I've been using Rcpp for a while now, and finding it very useful ---
Recently, though, I came across strange behaviour when running under
gctorture(TRUE) and C++ exceptions were being forwarded to R. The error
message string at the R level was some essentially random pathname, and
the string in the C++ exception was nowhere to be seen. The classname
at the R level was the logical TRUE value.
The patch below fixed the problem for me. I would not claim to fully
know what I'm doing, so perhaps somebody who does could review and then
make the proper fix :-)
--- src/exceptions.cpp 2012-10-01 01:29:53.000000000 +0100
+++ ../Rcpp/src/exceptions.cpp 2012-10-08 11:14:39.435644100 +0100
@@ -161,14 +161,23 @@
exception_class = name ; /* just using the mangled name */
- SEXP cppExceptSym = Rf_install("cpp_exception"); // cannot cause a gc() once in symbol table
- ), R_FindNamespace(Rf_mkString("Rcpp"))
- ) ;
+ SEXP cppExceptSym;
+ SEXP str_what, str_class, str_ns, ns, expr;
+ PROTECT(cppExceptSym = Rf_install("cpp_exception"));
+ PROTECT(str_what = Rf_mkString(exception_what.c_str()));
+ PROTECT(str_class = Rf_mkString(exception_class.c_str()));
+ PROTECT(str_ns = Rf_mkString("Rcpp"));
+ PROTECT(ns = R_FindNamespace(str_ns));
+ PROTECT(expr = Rf_lang3(cppExceptSym, str_what, str_class));
+ Rf_eval(expr, ns); /* Should not return. */
+ // Do this in case somehow someone replaces the definition of
+ // "cpp_exception" such that it does return:
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