There seems to be a latent flaw in the definition of struct SEXPREC
in Rinternals.h, which likely doesn't cause problems now, but could
if the relative sizes of data types changes.
The SEXPREC structure contains a union that includes a primsxp,
symsxp, etc, but not a vecsxp. However, in allocVector in memory.c,
zero-length vectors are allocated using allocSExpNonCons, which
appears to allocates a SEXPREC structure. This won't work if a vecsxp
is larger than the other types that are in the union in the SEXPREC
structure.
Simply adding a vecsxp to the union would seem to fix this, as in
the following patch:
Index: src/include/Rinternals.h
===================================================================
--- src/include/Rinternals.h (revision 56640)
+++ src/include/Rinternals.h (working copy)
@@ -219,6 +219,7 @@
typedef struct SEXPREC {
SEXPREC_HEADER;
union {
+ struct vecsxp_struct vecsxp;
struct primsxp_struct primsxp;
struct symsxp_struct symsxp;
struct listsxp_struct listsxp;
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