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SF bug #494668: PUSH() should assert-fail on overflow. 

eval_frame():  Added asserts to the top of the eval loop, to verify
that the eval stack pointer is in bounds, plus some comments.
This commit is contained in:
Tim Peters 2001-12-19 04:11:07 +00:00
parent 81b61bdc1a
commit b6d14daa1c
1 changed files with 4 additions and 2 deletions
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Python/ceval.c
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@ -497,7 +497,7 @@ eval_frame(PyFrameObject *f)
#ifdef DXPAIRS
int lastopcode = 0;
#endif
PyObject **stack_pointer;
PyObject **stack_pointer; /* Next free slot in value stack */
register unsigned char *next_instr;
register int opcode=0; /* Current opcode */
register int oparg=0; /* Current opcode argument, if any */
@ -586,7 +586,7 @@ eval_frame(PyFrameObject *f)
next_instr = first_instr + f->f_lasti;
stack_pointer = f->f_stacktop;
assert(stack_pointer != NULL);
f->f_stacktop = NULL;
f->f_stacktop = NULL; /* remains NULL unless yield suspends frame */
if (tstate->use_tracing) {
if (tstate->c_tracefunc != NULL) {
@ -634,6 +634,8 @@ eval_frame(PyFrameObject *f)
w = NULL;
for (;;) {
assert(stack_pointer >= f->f_valuestack); /* else underflow */
assert(STACK_LEVEL() <= f->f_stacksize); /* else overflow */
/* Do periodic things. Doing this every time through
the loop would add too much overhead, so we do it
only every Nth instruction. We also do it if