suzanne.soy/racket
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

adjust cycle-detection valeu to avoid fixnum encoding

Browse Source 
Just in case.
This commit is contained in:
Matthew Flatt 2011-09-20 16:06:18 -06:00
parent 37823107d1
commit 27be90e7b7
1 changed files with 7 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
src/racket/src/read.c
View File

@ -4705,6 +4705,9 @@ static Scheme_Object *read_compact_k(void)
return read_compact(port, p->ku.k.i1);
}
/* never a valid symtab value: */
#define SYMTAB_IN_PROGRESS SCHEME_MULTIPLE_VALUES
static Scheme_Object *read_compact(CPort *port, int use_stack)
{
#define BLK_BUF_SIZE 32
@ -4746,13 +4749,13 @@ static Scheme_Object *read_compact(CPort *port, int use_stack)
l = read_compact_number(port);
RANGE_CHECK(l, < port->symtab_size);
v = port->symtab[l];
if (v == (Scheme_Object *)-1) {
if (v == SYMTAB_IN_PROGRESS) {
/* there is a cycle */
scheme_ill_formed_code(port);
};
}
if (!v) {
intptr_t save_pos = port->pos;
port->symtab[l] = (Scheme_Object *)-1; /* avoid cycles if marshaled form is broken: */
port->symtab[l] = SYMTAB_IN_PROGRESS; /* avoid cycles if marshaled form is broken: */
port->pos = port->shared_offsets[l - 1];
v = read_compact(port, 0);
port->pos = save_pos;
@ -5116,7 +5119,7 @@ static Scheme_Object *read_compact(CPort *port, int use_stack)
(Scheme_Object *)port->delay_info);
} else {
intptr_t save_pos = port->pos;
port->symtab[l] = scheme_false; /* avoid cycles if marshaled form is broken: */
port->symtab[l] = SYMTAB_IN_PROGRESS; /* avoid cycles if marshaled form is broken: */
port->pos = port->shared_offsets[l - 1];
v = read_compact(port, 0);
port->pos = save_pos;