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(Fbyte_code): Add error check for jumping out of range.

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This commit is contained in:
Richard M. Stallman 1996-12-30 05:59:42 +00:00
parent 0e5f305ee7
commit 3d5fc37b72
1 changed files with 10 additions and 0 deletions
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10
src/bytecode.c
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@ -258,6 +258,10 @@ Lisp_Object Qbytecode;
if (consing_since_gc > gc_cons_threshold) \
Fgarbage_collect ();
/* Check for jumping out of range. */
#define CHECK_RANGE(ARG) \
if (ARG >= bytestr_length) abort ()
DEFUN ("byte-code", Fbyte_code, Sbyte_code, 3, 3, 0,
"Function used internally in byte-compiled code.\n\
The first argument, BYTESTR, is a string of byte code;\n\
@ -288,6 +292,7 @@ If the third argument is incorrect, Emacs may crash.")
/* Cached address of beginning of string,
valid if BYTESTR equals STRING_SAVED. */
register unsigned char *strbeg;
int bytestr_length = XSTRING (bytestr)->size;
CHECK_STRING (bytestr, 0);
if (!VECTORP (vector))
@ -441,6 +446,7 @@ If the third argument is incorrect, Emacs may crash.")
MAYBE_GC ();
QUIT;
op = FETCH2; /* pc = FETCH2 loses since FETCH2 contains pc++ */
CHECK_RANGE (op);
pc = XSTRING (string_saved)->data + op;
break;
@ -450,6 +456,7 @@ If the third argument is incorrect, Emacs may crash.")
if (NILP (POP))
{
QUIT;
CHECK_RANGE (op);
pc = XSTRING (string_saved)->data + op;
}
break;
@ -460,6 +467,7 @@ If the third argument is incorrect, Emacs may crash.")
if (!NILP (POP))
{
QUIT;
CHECK_RANGE (op);
pc = XSTRING (string_saved)->data + op;
}
break;
@ -470,6 +478,7 @@ If the third argument is incorrect, Emacs may crash.")
if (NILP (TOP))
{
QUIT;
CHECK_RANGE (op);
pc = XSTRING (string_saved)->data + op;
}
else DISCARD (1);
@ -481,6 +490,7 @@ If the third argument is incorrect, Emacs may crash.")
if (!NILP (TOP))
{
QUIT;
CHECK_RANGE (op);
pc = XSTRING (string_saved)->data + op;
}
else DISCARD (1);