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log: Clean up misuse of Range for -dfilter 

Range encodes an integer interval [a,b] as { begin = a, end = b + 1 },
where a \in [0,2^64-1] and b \in [1,2^64].  Thus, zero end is to be
interpreted as 2^64.

The implementation of -dfilter (commit 3514552) uses Range
differently: it encodes [a,b] as { begin = a, end = b }.  The code
works, but it contradicts the specification of Range in range.h.

Switch to the specified representation.  Since it can't represent
[0,UINT64_MAX], we have to reject that now.  Add a test for it.

While we're rejecting anyway: observe that we reject -dfilter LOB..UPB
where LOB > UPB when UPB is zero, but happily create an empty Range
when it isn't.  Reject it then, too, and add a test for it.

While there, add a positive test for the problematic upper bound
UINT64_MAX.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Markus Armbruster 2016-07-01 13:47:46 +02:00 committed by Michael S. Tsirkin
parent 5178ecd863
commit 58e19e6e79
2 changed files with 25 additions and 13 deletions
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10
tests/test-logging.c
View File

@ -68,6 +68,16 @@ static void test_parse_range(void)
g_assert(qemu_log_in_addr_range(0x2050));
g_assert(qemu_log_in_addr_range(0x3050));
qemu_set_dfilter_ranges("0xffffffffffffffff-1", &error_abort);
g_assert(qemu_log_in_addr_range(UINT64_MAX));
g_assert_false(qemu_log_in_addr_range(UINT64_MAX - 1));
qemu_set_dfilter_ranges("0..0xffffffffffffffff", &err);
error_free_or_abort(&err);
qemu_set_dfilter_ranges("2..1", &err);
error_free_or_abort(&err);
qemu_set_dfilter_ranges("0x1000+onehundred", &err);
error_free_or_abort(&err);

28
util/log.c
View File

@ -131,8 +131,8 @@ bool qemu_log_in_addr_range(uint64_t addr)
if (debug_regions) {
int i = 0;
for (i = 0; i < debug_regions->len; i++) {
struct Range *range = &g_array_index(debug_regions, Range, i);
if (addr >= range->begin && addr <= range->end) {
Range *range = &g_array_index(debug_regions, Range, i);
if (addr >= range->begin && addr <= range->end - 1) {
return true;
}
}
@ -158,7 +158,7 @@ void qemu_set_dfilter_ranges(const char *filter_spec, Error **errp)
for (i = 0; ranges[i]; i++) {
const char *r = ranges[i];
const char *range_op, *r2, *e;
uint64_t r1val, r2val;
uint64_t r1val, r2val, lob, upb;
struct Range range;
range_op = strstr(r, "-");
@ -187,27 +187,29 @@ void qemu_set_dfilter_ranges(const char *filter_spec, Error **errp)
(int)(r2 - range_op), range_op);
goto out;
}
if (r2val == 0) {
error_setg(errp, "Invalid range");
goto out;
}
switch (*range_op) {
case '+':
range.begin = r1val;
range.end = r1val + (r2val - 1);
lob = r1val;
upb = r1val + r2val - 1;
break;
case '-':
range.end = r1val;
range.begin = r1val - (r2val - 1);
upb = r1val;
lob = r1val - (r2val - 1);
break;
case '.':
range.begin = r1val;
range.end = r2val;
lob = r1val;
upb = r2val;
break;
default:
g_assert_not_reached();
}
if (lob > upb || (lob == 0 && upb == UINT64_MAX)) {
error_setg(errp, "Invalid range");
goto out;
}
range.begin = lob;
range.end = upb + 1;
g_array_append_val(debug_regions, range);
}
out: