diff options
| -rw-r--r-- | src/lread.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/lread.c b/src/lread.c index c124d5a1d8f..f39e81ae2cf 100644 --- a/src/lread.c +++ b/src/lread.c @@ -2974,6 +2974,21 @@ read1 (Lisp_Object readcharfun, int *pch, bool first_in_list) vec = XVECTOR (tmp); if (vec->header.size == 0) invalid_syntax ("Empty byte-code object"); + + if (COMPILED_DOC_STRING < vec->header.size + && AREF (tmp, COMPILED_DOC_STRING) == make_fixnum (0)) + { + /* read_list found a docstring like '(#$ . 5521)' and treated it + as 0. This placeholder 0 would lead to accidental sharing in + purecopy's hash-consing, so replace it with a (hopefully) + unique integer placeholder, which is negative so that it is + not confused with a DOC file offset. Eventually + Snarf-documentation should replace the placeholder with the + actual docstring. */ + EMACS_UINT hash = XHASH (tmp) | (INTMASK - INTMASK / 2); + ASET (tmp, COMPILED_DOC_STRING, make_ufixnum (hash)); + } + make_byte_code (vec); return tmp; } |