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qemu-e2k/tests/test-string-output-visitor.c
Markus Armbruster 54addb01d8 string-output-visitor: Fix to use sufficient precision 
The string output visitor should serialize numbers so that the string
input visitor deserializes them back to the same number.  It fails to
do so.

print_type_number() uses format %f.  This is prone to nasty rounding
errors.  For instance, numbers between 0 and 0.0000005 get flushed to
zero.

We currently use this visitor only for HMP info migrate, info network,
info qtree, and info memdev.  No double values occur there as far as I
can tell.

Fix anyway by formatting with %.17g.  17 decimal digits always suffice
for IEEE double.

See also recent commit "qobject: Fix qnum_to_string() to use
sufficient precision".

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20201210161452.2813491-9-armbru@redhat.com>
2020-12-19 10:37:16 +01:00

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/*
* String Output Visitor unit-tests.
*
* Copyright (C) 2012 Red Hat Inc.
*
* Authors:
* Paolo Bonzini <pbonzini@redhat.com> (based on test-qobject-output-visitor)
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu-common.h"
#include "qapi/error.h"
#include "qapi/string-output-visitor.h"
#include "test-qapi-visit.h"
typedef struct TestOutputVisitorData {
Visitor *ov;
char *str;
bool human;
} TestOutputVisitorData;
static void visitor_output_setup_internal(TestOutputVisitorData *data,
bool human)
{
data->human = human;
data->ov = string_output_visitor_new(human, &data->str);
g_assert(data->ov);
}
static void visitor_output_setup(TestOutputVisitorData *data,
const void *unused)
{
return visitor_output_setup_internal(data, false);
}
static void visitor_output_setup_human(TestOutputVisitorData *data,
const void *unused)
{
return visitor_output_setup_internal(data, true);
}
static void visitor_output_teardown(TestOutputVisitorData *data,
const void *unused)
{
visit_free(data->ov);
data->ov = NULL;
g_free(data->str);
data->str = NULL;
}
static char *visitor_get(TestOutputVisitorData *data)
{
visit_complete(data->ov, &data->str);
g_assert(data->str);
return data->str;
}
static void visitor_reset(TestOutputVisitorData *data)
{
bool human = data->human;
visitor_output_teardown(data, NULL);
visitor_output_setup_internal(data, human);
}
static void test_visitor_out_int(TestOutputVisitorData *data,
const void *unused)
{
int64_t value = 42;
char *str;
visit_type_int(data->ov, NULL, &value, &error_abort);
str = visitor_get(data);
if (data->human) {
g_assert_cmpstr(str, ==, "42 (0x2a)");
} else {
g_assert_cmpstr(str, ==, "42");
}
}
static void test_visitor_out_intList(TestOutputVisitorData *data,
const void *unused)
{
int64_t value[] = {0, 1, 9, 10, 16, 15, 14,
3, 4, 5, 6, 11, 12, 13, 21, 22, INT64_MAX - 1, INT64_MAX};
intList *list = NULL, **tmp = &list;
int i;
Error *err = NULL;
char *str;
for (i = 0; i < ARRAY_SIZE(value); i++) {
*tmp = g_malloc0(sizeof(**tmp));
(*tmp)->value = value[i];
tmp = &(*tmp)->next;
}
visit_type_intList(data->ov, NULL, &list, &err);
g_assert(err == NULL);
str = visitor_get(data);
if (data->human) {
g_assert_cmpstr(str, ==,
"0-1,3-6,9-16,21-22,9223372036854775806-9223372036854775807 "
"(0x0-0x1,0x3-0x6,0x9-0x10,0x15-0x16,"
"0x7ffffffffffffffe-0x7fffffffffffffff)");
} else {
g_assert_cmpstr(str, ==,
"0-1,3-6,9-16,21-22,9223372036854775806-9223372036854775807");
}
qapi_free_intList(list);
}
static void test_visitor_out_bool(TestOutputVisitorData *data,
const void *unused)
{
bool value = true;
char *str;
visit_type_bool(data->ov, NULL, &value, &error_abort);
str = visitor_get(data);
g_assert_cmpstr(str, ==, "true");
}
static void test_visitor_out_number(TestOutputVisitorData *data,
const void *unused)
{
double value = 3.1415926535897932;
char *str;
visit_type_number(data->ov, NULL, &value, &error_abort);
str = visitor_get(data);
g_assert_cmpstr(str, ==, "3.1415926535897931");
}
static void test_visitor_out_string(TestOutputVisitorData *data,
const void *unused)
{
char *string = (char *) "Q E M U";
const char *string_human = "\"Q E M U\"";
char *str;
visit_type_str(data->ov, NULL, &string, &error_abort);
str = visitor_get(data);
if (data->human) {
g_assert_cmpstr(str, ==, string_human);
} else {
g_assert_cmpstr(str, ==, string);
}
}
static void test_visitor_out_no_string(TestOutputVisitorData *data,
const void *unused)
{
char *string = NULL;
char *str;
/* A null string should return "" */
visit_type_str(data->ov, NULL, &string, &error_abort);
str = visitor_get(data);
if (data->human) {
g_assert_cmpstr(str, ==, "<null>");
} else {
g_assert_cmpstr(str, ==, "");
}
}
static void test_visitor_out_enum(TestOutputVisitorData *data,
const void *unused)
{
char *str;
EnumOne i;
for (i = 0; i < ENUM_ONE__MAX; i++) {
visit_type_EnumOne(data->ov, "unused", &i, &error_abort);
str = visitor_get(data);
if (data->human) {
char *str_human = g_strdup_printf("\"%s\"", EnumOne_str(i));
g_assert_cmpstr(str, ==, str_human);
g_free(str_human);
} else {
g_assert_cmpstr(str, ==, EnumOne_str(i));
}
visitor_reset(data);
}
}
static void
output_visitor_test_add(const char *testpath,
TestOutputVisitorData *data,
void (*test_func)(TestOutputVisitorData *data,
const void *user_data),
bool human)
{
g_test_add(testpath, TestOutputVisitorData, data,
human ? visitor_output_setup_human : visitor_output_setup,
test_func, visitor_output_teardown);
}
int main(int argc, char **argv)
{
TestOutputVisitorData out_visitor_data;
g_test_init(&argc, &argv, NULL);
output_visitor_test_add("/string-visitor/output/int",
&out_visitor_data, test_visitor_out_int, false);
output_visitor_test_add("/string-visitor/output/int-human",
&out_visitor_data, test_visitor_out_int, true);
output_visitor_test_add("/string-visitor/output/bool",
&out_visitor_data, test_visitor_out_bool, false);
output_visitor_test_add("/string-visitor/output/bool-human",
&out_visitor_data, test_visitor_out_bool, true);
output_visitor_test_add("/string-visitor/output/number",
&out_visitor_data, test_visitor_out_number, false);
output_visitor_test_add("/string-visitor/output/number-human",
&out_visitor_data, test_visitor_out_number, true);
output_visitor_test_add("/string-visitor/output/string",
&out_visitor_data, test_visitor_out_string, false);
output_visitor_test_add("/string-visitor/output/string-human",
&out_visitor_data, test_visitor_out_string, true);
output_visitor_test_add("/string-visitor/output/no-string",
&out_visitor_data, test_visitor_out_no_string,
false);
output_visitor_test_add("/string-visitor/output/no-string-human",
&out_visitor_data, test_visitor_out_no_string,
true);
output_visitor_test_add("/string-visitor/output/enum",
&out_visitor_data, test_visitor_out_enum, false);
output_visitor_test_add("/string-visitor/output/enum-human",
&out_visitor_data, test_visitor_out_enum, true);
output_visitor_test_add("/string-visitor/output/intList",
&out_visitor_data, test_visitor_out_intList, false);
output_visitor_test_add("/string-visitor/output/intList-human",
&out_visitor_data, test_visitor_out_intList, true);
g_test_run();
return 0;
}
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