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log: Fix qemu_set_dfilter_ranges() error reporting

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g_error() is not an acceptable way to report errors to the user:

    $ qemu-system-x86_64 -dfilter 1000+0

    ** (process:17187): ERROR **: Failed to parse range in: 1000+0
    Trace/breakpoint trap (core dumped)

g_assert() isn't, either:

    $ qemu-system-x86_64 -dfilter 1000x+64
    **
    ERROR:/work/armbru/qemu/util/log.c:180:qemu_set_dfilter_ranges: assertion failed: (e == range_op)
    Aborted (core dumped)

Convert qemu_set_dfilter_ranges() to Error.  Rework its deeply nested
control flow.  Touch up the error messages.  Call it with
&error_fatal.

This also permits testing without a subprocess, so do that.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <1466011636-6112-3-git-send-email-armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Markus Armbruster 2016-06-15 19:27:15 +02:00
parent 2ec62faea2
commit bd6fee9f12
4 changed files with 77 additions and 93 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/qemu/log.h
View File

@ -107,7 +107,7 @@ extern const QEMULogItem qemu_log_items[];
void qemu_set_log(int log_flags);
void qemu_log_needs_buffers(void);
void qemu_set_log_filename(const char *filename);
void qemu_set_dfilter_ranges(const char *ranges);
void qemu_set_dfilter_ranges(const char *ranges, Error **errp);
bool qemu_log_in_addr_range(uint64_t addr);
int qemu_str_to_log_mask(const char *str);

49
tests/test-logging.c
View File

@ -27,11 +27,14 @@
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "include/qemu/log.h"
#include "qapi/error.h"
#include "qemu/log.h"
static void test_parse_range(void)
{
qemu_set_dfilter_ranges("0x1000+0x100");
Error *err = NULL;
qemu_set_dfilter_ranges("0x1000+0x100", &error_abort);
g_assert_false(qemu_log_in_addr_range(0xfff));
g_assert(qemu_log_in_addr_range(0x1000));
@ -39,56 +42,40 @@ static void test_parse_range(void)
g_assert(qemu_log_in_addr_range(0x10ff));
g_assert_false(qemu_log_in_addr_range(0x1100));
qemu_set_dfilter_ranges("0x1000-0x100");
qemu_set_dfilter_ranges("0x1000-0x100", &error_abort);
g_assert_false(qemu_log_in_addr_range(0x1001));
g_assert(qemu_log_in_addr_range(0x1000));
g_assert(qemu_log_in_addr_range(0x0f01));
g_assert_false(qemu_log_in_addr_range(0x0f00));
qemu_set_dfilter_ranges("0x1000..0x1100");
qemu_set_dfilter_ranges("0x1000..0x1100", &error_abort);
g_assert_false(qemu_log_in_addr_range(0xfff));
g_assert(qemu_log_in_addr_range(0x1000));
g_assert(qemu_log_in_addr_range(0x1100));
g_assert_false(qemu_log_in_addr_range(0x1101));
qemu_set_dfilter_ranges("0x1000..0x1000");
qemu_set_dfilter_ranges("0x1000..0x1000", &error_abort);
g_assert_false(qemu_log_in_addr_range(0xfff));
g_assert(qemu_log_in_addr_range(0x1000));
g_assert_false(qemu_log_in_addr_range(0x1001));
qemu_set_dfilter_ranges("0x1000+0x100,0x2100-0x100,0x3000..0x3100");
qemu_set_dfilter_ranges("0x1000+0x100,0x2100-0x100,0x3000..0x3100",
&error_abort);
g_assert(qemu_log_in_addr_range(0x1050));
g_assert(qemu_log_in_addr_range(0x2050));
g_assert(qemu_log_in_addr_range(0x3050));
qemu_set_dfilter_ranges("0x1000+onehundred", &err);
error_free_or_abort(&err);
qemu_set_dfilter_ranges("0x1000+0", &err);
error_free_or_abort(&err);
}
#ifdef CONFIG_HAS_GLIB_SUBPROCESS_TESTS
static void test_parse_invalid_range_subprocess(void)
{
qemu_set_dfilter_ranges("0x1000+onehundred");
}
static void test_parse_invalid_range(void)
{
g_test_trap_subprocess("/logging/parse_invalid_range/subprocess", 0, 0);
g_test_trap_assert_failed();
g_test_trap_assert_stdout("");
g_test_trap_assert_stderr("*Failed to parse range in: 0x1000+onehundred\n");
}
static void test_parse_zero_range_subprocess(void)
{
qemu_set_dfilter_ranges("0x1000+0");
}
static void test_parse_zero_range(void)
{
g_test_trap_subprocess("/logging/parse_zero_range/subprocess", 0, 0);
g_test_trap_assert_failed();
g_test_trap_assert_stdout("");
g_test_trap_assert_stderr("*Failed to parse range in: 0x1000+0\n");
}
/* As the only real failure from a bad log filename path spec is
* reporting to the user we have to use the g_test_trap_subprocess
* mechanism and check no errors reported on stderr.
@ -126,10 +113,6 @@ int main(int argc, char **argv)
g_test_add_func("/logging/parse_range", test_parse_range);
#ifdef CONFIG_HAS_GLIB_SUBPROCESS_TESTS
g_test_add_func("/logging/parse_invalid_range/subprocess", test_parse_invalid_range_subprocess);
g_test_add_func("/logging/parse_invalid_range", test_parse_invalid_range);
g_test_add_func("/logging/parse_zero_range/subprocess", test_parse_zero_range_subprocess);
g_test_add_func("/logging/parse_zero_range", test_parse_zero_range);
g_test_add_func("/logging/parse_path", test_parse_path);
g_test_add_func("/logging/parse_path/subprocess", test_parse_path_subprocess);
g_test_add_func("/logging/parse_invalid_path", test_parse_invalid_path);

61
util/log.c
View File

@ -22,6 +22,7 @@
#include "qemu/log.h"
#include "qemu/range.h"
#include "qemu/error-report.h"
#include "qapi/error.h"
#include "qemu/cutils.h"
#include "trace/control.h"
@ -142,24 +143,26 @@ bool qemu_log_in_addr_range(uint64_t addr)
}
void qemu_set_dfilter_ranges(const char *filter_spec)
void qemu_set_dfilter_ranges(const char *filter_spec, Error **errp)
{
gchar **ranges = g_strsplit(filter_spec, ",", 0);
int i;
if (debug_regions) {
g_array_unref(debug_regions);
debug_regions = NULL;
}
if (ranges) {
gchar **next = ranges;
gchar *r = *next++;
debug_regions = g_array_sized_new(FALSE, FALSE,
sizeof(Range), g_strv_length(ranges));
while (r) {
char *range_op = strstr(r, "-");
char *r2 = range_op ? range_op + 1 : NULL;
for (i = 0; ranges[i]; i++) {
const char *r = ranges[i];
const char *range_op, *r2, *e;
uint64_t r1val, r2val;
struct Range range;
range_op = strstr(r, "-");
r2 = range_op ? range_op + 1 : NULL;
if (!range_op) {
range_op = strstr(r, "+");
r2 = range_op ? range_op + 1 : NULL;
@ -168,30 +171,36 @@ void qemu_set_dfilter_ranges(const char *filter_spec)
range_op = strstr(r, "..");
r2 = range_op ? range_op + 2 : NULL;
}
if (range_op) {
const char *e = NULL;
uint64_t r1val, r2val;
if (!range_op) {
error_setg(errp, "Bad range specifier");
goto out;
}
if ((qemu_strtoull(r, &e, 0, &r1val) == 0) &&
(qemu_strtoull(r2, NULL, 0, &r2val) == 0) &&
r2val > 0) {
struct Range range;
g_assert(e == range_op);
if (qemu_strtoull(r, &e, 0, &r1val)
|| e != range_op) {
error_setg(errp, "Invalid number to the left of %.*s",
(int)(r2 - range_op), range_op);
goto out;
}
if (qemu_strtoull(r2, NULL, 0, &r2val)) {
error_setg(errp, "Invalid number to the right of %.*s",
(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);
break;
}
case '-':
{
range.end = r1val;
range.begin = r1val - (r2val - 1);
break;
}
case '.':
range.begin = r1val;
range.end = r2val;
@ -200,17 +209,9 @@ void qemu_set_dfilter_ranges(const char *filter_spec)
g_assert_not_reached();
}
g_array_append_val(debug_regions, range);
} else {
g_error("Failed to parse range in: %s", r);
}
} else {
g_error("Bad range specifier in: %s", r);
}
r = *next++;
}
out:
g_strfreev(ranges);
}
}
/* fflush() the log file */

2
vl.c
View File

@ -3339,7 +3339,7 @@ int main(int argc, char **argv, char **envp)
log_file = optarg;
break;
case QEMU_OPTION_DFILTER:
qemu_set_dfilter_ranges(optarg);
qemu_set_dfilter_ranges(optarg, &error_fatal);
break;
case QEMU_OPTION_s:
add_device_config(DEV_GDB, "tcp::" DEFAULT_GDBSTUB_PORT);