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* array.c (rb_ary_{permutation,combination}): disallow reentrance 

with continuation since work-buffers cannot restore.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@24364 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
nobu 2009-08-03 06:48:46 +00:00
parent 8b0fef3747
commit 49816a2552
2 changed files with 20 additions and 9 deletions
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5
ChangeLog
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@ -1,4 +1,7 @@
Mon Aug 3 13:05:22 2009 Nobuyoshi Nakada <nobu@ruby-lang.org>
Mon Aug 3 15:48:40 2009 Nobuyoshi Nakada <nobu@ruby-lang.org>
* array.c (rb_ary_{permutation,combination}): disallow reentrance
with continuation since work-buffers cannot restore.
* array.c (rb_ary_{permutation,combination,product}): must not use
ary_discard on strings.

24
array.c
View File

@ -3647,6 +3647,9 @@ rb_ary_cycle(int argc, VALUE *argv, VALUE ary)
}
#define tmpbuf(n, size) rb_str_tmp_new((n)*(size))
#define tmpbuf_discard(s) (rb_str_resize((s), 0L), RBASIC(s)->klass = rb_cString)
#define tmpary(n) rb_ary_tmp_new(n)
#define tmpary_discard(a) (ary_discard(a), RBASIC(a)->klass = rb_cArray)
/*
* Recursively compute permutations of r elements of the set [0..n-1].
@ -3684,6 +3687,9 @@ permute0(long n, long r, long *p, long index, int *used, VALUE values)
for (j = 0; j < r; j++) result_array[j] = values_array[p[j]];
ARY_SET_LEN(result, r);
rb_yield(result);
if (RBASIC(values)->klass) {
rb_raise(rb_eRuntimeError, "permute reentered");
}
}
}
}
@ -3748,8 +3754,8 @@ rb_ary_permutation(int argc, VALUE *argv, VALUE ary)
for (i = 0; i < n; i++) used[i] = 0; /* initialize array */
permute0(n, r, p, 0, used, ary0); /* compute and yield permutations */
rb_str_resize(t0, 0L);
rb_str_resize(t1, 0L);
tmpbuf_discard(t0);
tmpbuf_discard(t1);
RBASIC(ary0)->klass = rb_cArray;
}
return ary;
@ -3822,11 +3828,10 @@ rb_ary_combination(VALUE ary, VALUE num)
volatile VALUE t0 = tmpbuf(n+1, sizeof(long));
long *stack = (long*)RSTRING_PTR(t0);
long nlen = combi_len(len, n);
volatile VALUE cc = rb_ary_new2(n);
volatile VALUE cc = tmpary(n);
VALUE *chosen = RARRAY_PTR(cc);
long lev = 0;
RBASIC(cc)->klass = 0;
MEMZERO(stack, long, n);
stack[0] = -1;
for (i = 0; i < nlen; i++) {
@ -3835,12 +3840,15 @@ rb_ary_combination(VALUE ary, VALUE num)
chosen[lev] = RARRAY_PTR(ary)[stack[lev+1] = stack[lev]+1];
}
rb_yield(rb_ary_new4(n, chosen));
if (RBASIC(t0)->klass) {
rb_raise(rb_eRuntimeError, "combination reentered");
}
do {
stack[lev--]++;
} while (lev && (stack[lev+1]+n == len+lev+1));
}
rb_str_resize(t0, 0L);
ary_discard(cc);
tmpbuf_discard(t0);
tmpary_discard(cc);
}
return ary;
}
@ -3918,8 +3926,8 @@ rb_ary_product(int argc, VALUE *argv, VALUE ary)
counters[m]++;
}
}
rb_str_resize(t0, 0L);
rb_str_resize(t1, 0L);
tmpbuf_discard(t0);
tmpbuf_discard(t1);
return result;
}