[Qemu-devel] [PATCH 2/8] qapi: Unit tests for visitor-based serialization

[Andreas Färber]

From: Michael Roth <address@hidden>

Currently we test our visitors individually, and seperately for input
vs. output. This is useful for validating internal representations
against the native C types and vice-versa, and other visitor-specific
testing, but it doesn't cover the potential use-case of using visitor
pairs for serialization/deserialization very well, and makes it
hard to easily extend the coverage for different C types / boundary
conditions.

To cover that we add a set of unit tests that takes a number of native C
values, passes them into an output visitor, extracts the values with an
input visitor, then compares the result to the original.

Plugging in new visitors to the test harness only requires a user to
implement the SerializeOps interface and add it to a list.

Signed-off-by: Michael Roth <address@hidden>
Signed-off-by: Andreas Färber <address@hidden>
---
 tests/Makefile                     |    4 +-
 tests/test-visitor-serialization.c |  744 ++++++++++++++++++++++++++++++++++++
 2 files changed, 747 insertions(+), 1 deletions(-)
 create mode 100644 tests/test-visitor-serialization.c

diff --git a/tests/Makefile b/tests/Makefile
index 2e754c3..d66ab19 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -13,6 +13,7 @@ check-unit-y += tests/test-qmp-commands$(EXESUF)
 check-unit-y += tests/test-string-input-visitor$(EXESUF)
 check-unit-y += tests/test-string-output-visitor$(EXESUF)
 check-unit-y += tests/test-coroutine$(EXESUF)
+check-unit-y += tests/test-visitor-serialization$(EXESUF)
 
 check-block-$(CONFIG_POSIX) += tests/qemu-iotests-quick.sh
 
@@ -31,7 +32,7 @@ test-obj-y = tests/check-qint.o tests/check-qstring.o 
tests/check-qdict.o \
        tests/test-coroutine.o tests/test-string-output-visitor.o \
        tests/test-string-input-visitor.o tests/test-qmp-output-visitor.o \
        tests/test-qmp-input-visitor.o tests/test-qmp-input-strict.o \
-       tests/test-qmp-commands.o
+       tests/test-qmp-commands.o tests/test-visitor-serialization.o
 
 test-qapi-obj-y =  $(qobject-obj-y) $(qapi-obj-y) $(tools-obj-y)
 test-qapi-obj-y += tests/test-qapi-visit.o tests/test-qapi-types.o
@@ -64,6 +65,7 @@ tests/test-qmp-output-visitor$(EXESUF): 
tests/test-qmp-output-visitor.o $(test-q
 tests/test-qmp-input-visitor$(EXESUF): tests/test-qmp-input-visitor.o 
$(test-qapi-obj-y)
 tests/test-qmp-input-strict$(EXESUF): tests/test-qmp-input-strict.o 
$(test-qapi-obj-y)
 tests/test-qmp-commands$(EXESUF): tests/test-qmp-commands.o 
tests/test-qmp-marshal.o $(test-qapi-obj-y)
+tests/test-visitor-serialization$(EXESUF): tests/test-visitor-serialization.o 
$(test-qapi-obj-y)
 
 tests/rtc-test$(EXESUF): tests/rtc-test.o $(trace-obj-y)
 tests/m48t59-test$(EXESUF): tests/m48t59-test.o $(trace-obj-y)
diff --git a/tests/test-visitor-serialization.c 
b/tests/test-visitor-serialization.c
new file mode 100644
index 0000000..6ef57d0
--- /dev/null
+++ b/tests/test-visitor-serialization.c
@@ -0,0 +1,744 @@
+/*
+ * Unit-tests for visitor-based serialization
+ *
+ * Copyright IBM, Corp. 2012
+ *
+ * Authors:
+ *  Michael Roth <address@hidden>
+ *
+ * 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 <glib.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <float.h>
+#include "test-qapi-types.h"
+#include "test-qapi-visit.h"
+#include "qemu-objects.h"
+#include "qapi/qmp-input-visitor.h"
+#include "qapi/qmp-output-visitor.h"
+
+typedef struct PrimitiveType {
+    union {
+        const char *string;
+        bool boolean;
+        double number;
+        int64_t integer;
+        uint8_t u8;
+        uint16_t u16;
+        uint32_t u32;
+        uint64_t u64;
+        int8_t s8;
+        int16_t s16;
+        int32_t s32;
+        int64_t s64;
+        intmax_t max;
+    } value;
+    enum {
+        PTYPE_STRING = 0,
+        PTYPE_BOOLEAN,
+        PTYPE_NUMBER,
+        PTYPE_INTEGER,
+        PTYPE_U8,
+        PTYPE_U16,
+        PTYPE_U32,
+        PTYPE_U64,
+        PTYPE_S8,
+        PTYPE_S16,
+        PTYPE_S32,
+        PTYPE_S64,
+        PTYPE_EOL,
+    } type;
+    const char *description;
+} PrimitiveType;
+
+/* test helpers */
+
+static void visit_primitive_type(Visitor *v, void **native, Error **errp)
+{
+    PrimitiveType *pt = *native;
+    switch(pt->type) {
+    case PTYPE_STRING:
+        visit_type_str(v, (char **)&pt->value.string, NULL, errp);
+        break;
+    case PTYPE_BOOLEAN:
+        visit_type_bool(v, &pt->value.boolean, NULL, errp);
+        break;
+    case PTYPE_NUMBER:
+        visit_type_number(v, &pt->value.number, NULL, errp);
+        break;
+    case PTYPE_INTEGER:
+        visit_type_int(v, &pt->value.integer, NULL, errp);
+        break;
+    case PTYPE_U8:
+        visit_type_uint8(v, &pt->value.u8, NULL, errp);
+        break;
+    case PTYPE_U16:
+        visit_type_uint16(v, &pt->value.u16, NULL, errp);
+        break;
+    case PTYPE_U32:
+        visit_type_uint32(v, &pt->value.u32, NULL, errp);
+        break;
+    case PTYPE_U64:
+        visit_type_uint64(v, &pt->value.u64, NULL, errp);
+        break;
+    case PTYPE_S8:
+        visit_type_int8(v, &pt->value.s8, NULL, errp);
+        break;
+    case PTYPE_S16:
+        visit_type_int16(v, &pt->value.s16, NULL, errp);
+        break;
+    case PTYPE_S32:
+        visit_type_int32(v, &pt->value.s32, NULL, errp);
+        break;
+    case PTYPE_S64:
+        visit_type_int64(v, &pt->value.s64, NULL, errp);
+        break;
+    case PTYPE_EOL:
+        g_assert(false);
+    }
+}
+
+typedef struct TestStruct
+{
+    int64_t integer;
+    bool boolean;
+    char *string;
+} TestStruct;
+
+static void visit_type_TestStruct(Visitor *v, TestStruct **obj,
+                                  const char *name, Error **errp)
+{
+    visit_start_struct(v, (void **)obj, NULL, name, sizeof(TestStruct), errp);
+
+    visit_type_int(v, &(*obj)->integer, "integer", errp);
+    visit_type_bool(v, &(*obj)->boolean, "boolean", errp);
+    visit_type_str(v, &(*obj)->string, "string", errp);
+
+    visit_end_struct(v, errp);
+}
+
+static TestStruct *struct_create(void)
+{
+    TestStruct *ts = g_malloc0(sizeof(*ts));
+    ts->integer = -42;
+    ts->boolean = true;
+    ts->string = strdup("test string");
+    return ts;
+}
+
+static void struct_compare(TestStruct *ts1, TestStruct *ts2)
+{
+    g_assert(ts1);
+    g_assert(ts2);
+    g_assert_cmpint(ts1->integer, ==, ts2->integer);
+    g_assert(ts1->boolean == ts2->boolean);
+    g_assert_cmpstr(ts1->string, ==, ts2->string);
+}
+
+static void struct_cleanup(TestStruct *ts)
+{
+    g_free(ts->string);
+    g_free(ts);
+}
+
+static void visit_struct(Visitor *v, void **native, Error **errp)
+{
+    visit_type_TestStruct(v, (TestStruct **)native, NULL, errp);
+}
+
+static UserDefNested *nested_struct_create(void)
+{
+    UserDefNested *udnp = g_malloc0(sizeof(*udnp));
+    udnp->string0 = strdup("test_string0");
+    udnp->dict1.string1 = strdup("test_string1");
+    udnp->dict1.dict2.userdef1 = g_malloc0(sizeof(UserDefOne));
+    udnp->dict1.dict2.userdef1->integer = 42;
+    udnp->dict1.dict2.userdef1->string = strdup("test_string");
+    udnp->dict1.dict2.string2 = strdup("test_string2");
+    udnp->dict1.has_dict3 = true;
+    udnp->dict1.dict3.userdef2 = g_malloc0(sizeof(UserDefOne));
+    udnp->dict1.dict3.userdef2->integer = 43;
+    udnp->dict1.dict3.userdef2->string = strdup("test_string");
+    udnp->dict1.dict3.string3 = strdup("test_string3");
+    return udnp;
+}
+
+static void nested_struct_compare(UserDefNested *udnp1, UserDefNested *udnp2)
+{
+    g_assert(udnp1);
+    g_assert(udnp2);
+    g_assert_cmpstr(udnp1->string0, ==, udnp2->string0);
+    g_assert_cmpstr(udnp1->dict1.string1, ==, udnp2->dict1.string1);
+    g_assert_cmpint(udnp1->dict1.dict2.userdef1->integer, ==,
+                    udnp2->dict1.dict2.userdef1->integer);
+    g_assert_cmpstr(udnp1->dict1.dict2.userdef1->string, ==,
+                    udnp2->dict1.dict2.userdef1->string);
+    g_assert_cmpstr(udnp1->dict1.dict2.string2, ==, 
udnp2->dict1.dict2.string2);
+    g_assert(udnp1->dict1.has_dict3 == udnp2->dict1.has_dict3);
+    g_assert_cmpint(udnp1->dict1.dict3.userdef2->integer, ==,
+                    udnp2->dict1.dict3.userdef2->integer);
+    g_assert_cmpstr(udnp1->dict1.dict3.userdef2->string, ==,
+                    udnp2->dict1.dict3.userdef2->string);
+    g_assert_cmpstr(udnp1->dict1.dict3.string3, ==, 
udnp2->dict1.dict3.string3);
+}
+
+static void nested_struct_cleanup(UserDefNested *udnp)
+{
+    qapi_free_UserDefNested(udnp);
+}
+
+static void visit_nested_struct(Visitor *v, void **native, Error **errp)
+{
+    visit_type_UserDefNested(v, (UserDefNested **)native, NULL, errp);
+}
+
+static void visit_nested_struct_list(Visitor *v, void **native, Error **errp)
+{
+    visit_type_UserDefNestedList(v, (UserDefNestedList **)native, NULL, errp);
+}
+
+/* test cases */
+
+typedef void (*VisitorFunc)(Visitor *v, void **native, Error **errp);
+
+typedef enum VisitorCapabilities {
+    VCAP_PRIMITIVES = 1,
+    VCAP_STRUCTURES = 2,
+    VCAP_LISTS = 4,
+} VisitorCapabilities;
+
+typedef struct SerializeOps {
+    void (*serialize)(void *native_in, void **datap,
+                      VisitorFunc visit, Error **errp);
+    void (*deserialize)(void **native_out, void *datap,
+                            VisitorFunc visit, Error **errp);
+    void (*cleanup)(void *datap);
+    const char *type;
+    VisitorCapabilities caps;
+} SerializeOps;
+
+typedef struct TestArgs {
+    const SerializeOps *ops;
+    void *test_data;
+} TestArgs;
+
+#define FLOAT_STRING_PRECISION 6 /* corresponding to n in %.nf formatting */
+static gsize calc_float_string_storage(double value)
+{
+    int whole_value = value;
+    gsize i = 0;
+    do {
+        i++;
+    } while (whole_value /= 10);
+    return i + 2 + FLOAT_STRING_PRECISION;
+}
+
+static void test_primitives(gconstpointer opaque)
+{
+    TestArgs *args = (TestArgs *) opaque;
+    const SerializeOps *ops = args->ops;
+    PrimitiveType *pt = args->test_data;
+    PrimitiveType *pt_copy = g_malloc0(sizeof(*pt_copy));
+    Error *err = NULL;
+    void *serialize_data;
+    char *double1, *double2;
+
+    pt_copy->type = pt->type;
+    ops->serialize(pt, &serialize_data, visit_primitive_type, &err);
+    ops->deserialize((void **)&pt_copy, serialize_data, visit_primitive_type, 
&err);
+
+    g_assert(err == NULL);
+    g_assert(pt_copy != NULL);
+    if (pt->type == PTYPE_STRING) {
+        g_assert_cmpstr(pt->value.string, ==, pt_copy->value.string);
+    } else if (pt->type == PTYPE_NUMBER) {
+        /* we serialize with %f for our reference visitors, so rather than 
fuzzy
+         * floating math to test "equality", just compare the formatted values
+         */
+        double1 = g_malloc0(calc_float_string_storage(pt->value.number));
+        double2 = g_malloc0(calc_float_string_storage(pt_copy->value.number));
+        g_assert_cmpstr(double1, ==, double2);
+        g_free(double1);
+        g_free(double2);
+    } else if (pt->type == PTYPE_BOOLEAN) {
+        g_assert_cmpint(!!pt->value.max, ==, !!pt->value.max);
+    } else {
+        g_assert_cmpint(pt->value.max, ==, pt_copy->value.max);
+    }
+
+    ops->cleanup(serialize_data);
+    g_free(args);
+}
+
+static void test_struct(gconstpointer opaque)
+{
+    TestArgs *args = (TestArgs *) opaque;
+    const SerializeOps *ops = args->ops;
+    TestStruct *ts = struct_create();
+    TestStruct *ts_copy = NULL;
+    Error *err = NULL;
+    void *serialize_data;
+
+    ops->serialize(ts, &serialize_data, visit_struct, &err);
+    ops->deserialize((void **)&ts_copy, serialize_data, visit_struct, &err); 
+
+    g_assert(err == NULL);
+    struct_compare(ts, ts_copy);
+
+    struct_cleanup(ts);
+    struct_cleanup(ts_copy);
+
+    ops->cleanup(serialize_data);
+    g_free(args);
+}
+
+static void test_nested_struct(gconstpointer opaque)
+{
+    TestArgs *args = (TestArgs *) opaque;
+    const SerializeOps *ops = args->ops;
+    UserDefNested *udnp = nested_struct_create();
+    UserDefNested *udnp_copy = NULL;
+    Error *err = NULL;
+    void *serialize_data;
+    
+    ops->serialize(udnp, &serialize_data, visit_nested_struct, &err);
+    ops->deserialize((void **)&udnp_copy, serialize_data, visit_nested_struct, 
&err); 
+
+    g_assert(err == NULL);
+    nested_struct_compare(udnp, udnp_copy);
+
+    nested_struct_cleanup(udnp);
+    nested_struct_cleanup(udnp_copy);
+
+    ops->cleanup(serialize_data);
+    g_free(args);
+}
+
+static void test_nested_struct_list(gconstpointer opaque)
+{
+    TestArgs *args = (TestArgs *) opaque;
+    const SerializeOps *ops = args->ops;
+    UserDefNestedList *listp = NULL, *tmp, *tmp_copy, *listp_copy = NULL;
+    Error *err = NULL;
+    void *serialize_data;
+    int i = 0;
+
+    for (i = 0; i < 8; i++) {
+        tmp = g_malloc0(sizeof(UserDefNestedList));
+        tmp->value = nested_struct_create();
+        tmp->next = listp;
+        listp = tmp;
+    }
+    
+    ops->serialize(listp, &serialize_data, visit_nested_struct_list, &err);
+    ops->deserialize((void **)&listp_copy, serialize_data,
+                     visit_nested_struct_list, &err); 
+
+    g_assert(err == NULL);
+
+    tmp = listp;
+    tmp_copy = listp_copy;
+    while (listp_copy) {
+        g_assert(listp);
+        nested_struct_compare(listp->value, listp_copy->value);
+        listp = listp->next;
+        listp_copy = listp_copy->next;
+    }
+
+    qapi_free_UserDefNestedList(tmp);
+    qapi_free_UserDefNestedList(tmp_copy);
+
+    ops->cleanup(serialize_data);
+    g_free(args);
+}
+
+PrimitiveType pt_values[] = {
+    /* string tests */
+    {
+        .description = "string_empty",
+        .type = PTYPE_STRING,
+        .value.string = "",
+    },
+    {
+        .description = "string_whitespace",
+        .type = PTYPE_STRING,
+        .value.string = "a b  c\td",
+    },
+    {
+        .description = "string_newlines",
+        .type = PTYPE_STRING,
+        .value.string = "a\nb\n",
+    },
+    {
+        .description = "string_commas",
+        .type = PTYPE_STRING,
+        .value.string = "a,b, c,d",
+    },
+    {
+        .description = "string_single_quoted",
+        .type = PTYPE_STRING,
+        .value.string = "'a b',cd",
+    },
+    {
+        .description = "string_double_quoted",
+        .type = PTYPE_STRING,
+        .value.string = "\"a b\",cd",
+    },
+    /* boolean tests */
+    {
+        .description = "boolean_true1",
+        .type = PTYPE_BOOLEAN,
+        .value.boolean = true,
+    },
+    {
+        .description = "boolean_true2",
+        .type = PTYPE_BOOLEAN,
+        .value.boolean = 8,
+    },
+    {
+        .description = "boolean_true3",
+        .type = PTYPE_BOOLEAN,
+        .value.boolean = -1,
+    },
+    {
+        .description = "boolean_false1",
+        .type = PTYPE_BOOLEAN,
+        .value.boolean = false,
+    },
+    {
+        .description = "boolean_false2",
+        .type = PTYPE_BOOLEAN,
+        .value.boolean = 0,
+    },
+    /* number tests (double) */
+    /* note: we format these to %.6f before comparing, since that's how
+     * we serialize them and it doesn't make sense to check precision
+     * beyond that.
+     */
+    {
+        .description = "number_sanity1",
+        .type = PTYPE_NUMBER,
+        .value.number = -1,
+    },
+    {
+        .description = "number_sanity2",
+        .type = PTYPE_NUMBER,
+        .value.number = 3.14159265,
+    },
+    {
+        .description = "number_min",
+        .type = PTYPE_NUMBER,
+        .value.number = DBL_MIN,
+    },
+    {
+        .description = "number_max",
+        .type = PTYPE_NUMBER,
+        .value.number = DBL_MAX,
+    },
+    /* integer tests (int64) */
+    {
+        .description = "integer_sanity1",
+        .type = PTYPE_INTEGER,
+        .value.integer = -1,
+    },
+    {
+        .description = "integer_sanity2",
+        .type = PTYPE_INTEGER,
+        .value.integer = INT64_MAX / 2 + 1,
+    },
+    {
+        .description = "integer_min",
+        .type = PTYPE_INTEGER,
+        .value.integer = INT64_MIN,
+    },
+    {
+        .description = "integer_max",
+        .type = PTYPE_INTEGER,
+        .value.integer = INT64_MAX,
+    },
+    /* uint8 tests */
+    {
+        .description = "uint8_sanity1",
+        .type = PTYPE_U8,
+        .value.u8 = 1,
+    },
+    {
+        .description = "uint8_sanity2",
+        .type = PTYPE_U8,
+        .value.u8 = UINT8_MAX / 2 + 1,
+    },
+    {
+        .description = "uint8_min",
+        .type = PTYPE_U8,
+        .value.u8 = 0,
+    },
+    {
+        .description = "uint8_max",
+        .type = PTYPE_U8,
+        .value.u8 = UINT8_MAX,
+    },
+    /* uint16 tests */
+    {
+        .description = "uint16_sanity1",
+        .type = PTYPE_U16,
+        .value.u16 = 1,
+    },
+    {
+        .description = "uint16_sanity2",
+        .type = PTYPE_U16,
+        .value.u16 = UINT16_MAX / 2 + 1,
+    },
+    {
+        .description = "uint16_min",
+        .type = PTYPE_U16,
+        .value.u16 = 0,
+    },
+    {
+        .description = "uint16_max",
+        .type = PTYPE_U16,
+        .value.u16 = UINT16_MAX,
+    },
+    /* uint32 tests */
+    {
+        .description = "uint32_sanity1",
+        .type = PTYPE_U32,
+        .value.u32 = 1,
+    },
+    {
+        .description = "uint32_sanity2",
+        .type = PTYPE_U32,
+        .value.u32 = UINT32_MAX / 2 + 1,
+    },
+    {
+        .description = "uint32_min",
+        .type = PTYPE_U32,
+        .value.u32 = 0,
+    },
+    {
+        .description = "uint32_max",
+        .type = PTYPE_U32,
+        .value.u32 = UINT32_MAX,
+    },
+    /* uint64 tests */
+    {
+        .description = "uint64_sanity1",
+        .type = PTYPE_U64,
+        .value.u64 = 1,
+    },
+    {
+        .description = "uint64_sanity2",
+        .type = PTYPE_U64,
+        .value.u64 = UINT64_MAX / 2 + 1,
+    },
+    {
+        .description = "uint64_min",
+        .type = PTYPE_U64,
+        .value.u64 = 0,
+    },
+    {
+        .description = "uint64_max",
+        .type = PTYPE_U64,
+        .value.u64 = UINT64_MAX,
+    },
+    /* int8 tests */
+    {
+        .description = "int8_sanity1",
+        .type = PTYPE_S8,
+        .value.s8 = -1,
+    },
+    {
+        .description = "int8_sanity2",
+        .type = PTYPE_S8,
+        .value.s8 = INT8_MAX / 2 + 1,
+    },
+    {
+        .description = "int8_min",
+        .type = PTYPE_S8,
+        .value.s8 = INT8_MIN,
+    },
+    {
+        .description = "int8_max",
+        .type = PTYPE_S8,
+        .value.s8 = INT8_MAX,
+    },
+    /* int16 tests */
+    {
+        .description = "int16_sanity1",
+        .type = PTYPE_S16,
+        .value.s16 = -1,
+    },
+    {
+        .description = "int16_sanity2",
+        .type = PTYPE_S16,
+        .value.s16 = INT16_MAX / 2 + 1,
+    },
+    {
+        .description = "int16_min",
+        .type = PTYPE_S16,
+        .value.s16 = INT16_MIN,
+    },
+    {
+        .description = "int16_max",
+        .type = PTYPE_S16,
+        .value.s16 = INT16_MAX,
+    },
+    /* int32 tests */
+    {
+        .description = "int32_sanity1",
+        .type = PTYPE_S32,
+        .value.s32 = -1,
+    },
+    {
+        .description = "int32_sanity2",
+        .type = PTYPE_S32,
+        .value.s32 = INT32_MAX / 2 + 1,
+    },
+    {
+        .description = "int32_min",
+        .type = PTYPE_S32,
+        .value.s32 = INT32_MIN,
+    },
+    {
+        .description = "int32_max",
+        .type = PTYPE_S32,
+        .value.s32 = INT32_MAX,
+    },
+    /* int64 tests */
+    {
+        .description = "int64_sanity1",
+        .type = PTYPE_S64,
+        .value.s64 = -1,
+    },
+    {
+        .description = "int64_sanity2",
+        .type = PTYPE_S64,
+        .value.s64 = INT64_MAX / 2 + 1,
+    },
+    {
+        .description = "int64_min",
+        .type = PTYPE_S64,
+        .value.s64 = INT64_MIN,
+    },
+    {
+        .description = "int64_max",
+        .type = PTYPE_S64,
+        .value.s64 = INT64_MAX,
+    },
+    { .type = PTYPE_EOL }
+};
+
+/* visitor-specific op implementations */
+
+typedef struct QmpSerializeData {
+    QmpOutputVisitor *qov;
+    QmpInputVisitor *qiv;
+} QmpSerializeData;
+
+static void qmp_serialize(void *native_in, void **datap,
+                          VisitorFunc visit, Error **errp)
+{
+    QmpSerializeData *d = g_malloc0(sizeof(*d));
+
+    d->qov = qmp_output_visitor_new();
+    visit(qmp_output_get_visitor(d->qov), &native_in, errp);
+    *datap = d;
+}
+
+static void qmp_deserialize(void **native_out, void *datap,
+                            VisitorFunc visit, Error **errp)
+{
+    QmpSerializeData *d = datap;
+    QString *output_json = qobject_to_json(qmp_output_get_qobject(d->qov));
+    QObject *obj = qobject_from_json(qstring_get_str(output_json));
+
+    QDECREF(output_json);
+    d->qiv = qmp_input_visitor_new(obj);
+    visit(qmp_input_get_visitor(d->qiv), native_out, errp);
+}
+
+static void qmp_cleanup(void *datap)
+{
+    QmpSerializeData *d = datap;
+    qmp_output_visitor_cleanup(d->qov);
+    qmp_input_visitor_cleanup(d->qiv);
+}
+
+/* visitor registration, test harness */
+
+/* note: to function interchangeably as a serialization mechanism your
+ * visitor test implementation should pass the test cases for all visitor
+ * capabilities: primitives, structures, and lists
+ */
+static const SerializeOps visitors[] = {
+    {
+        .type = "QMP",
+        .serialize = qmp_serialize,
+        .deserialize = qmp_deserialize,
+        .cleanup = qmp_cleanup,
+        .caps = VCAP_PRIMITIVES | VCAP_STRUCTURES | VCAP_LISTS
+    },
+    { NULL }
+};
+
+static void add_visitor_type(const SerializeOps *ops)
+{
+    char testname_prefix[128];
+    char testname[128];
+    TestArgs *args;
+    int i = 0;
+
+    sprintf(testname_prefix, "/visitor/serialization/%s", ops->type);
+
+    if (ops->caps & VCAP_PRIMITIVES) {
+        while (pt_values[i].type != PTYPE_EOL) {
+            sprintf(testname, "%s/primitives/%s", testname_prefix,
+                    pt_values[i].description);
+            args = g_malloc0(sizeof(*args));
+            args->ops = ops;
+            args->test_data = &pt_values[i];
+            g_test_add_data_func(testname, args, test_primitives);
+            i++;
+        }
+    }
+
+    if (ops->caps & VCAP_STRUCTURES) {
+        sprintf(testname, "%s/struct", testname_prefix);
+        args = g_malloc0(sizeof(*args));
+        args->ops = ops;
+        args->test_data = NULL;
+        g_test_add_data_func(testname, args, test_struct);
+
+        sprintf(testname, "%s/nested_struct", testname_prefix);
+        args = g_malloc0(sizeof(*args));
+        args->ops = ops;
+        args->test_data = NULL;
+        g_test_add_data_func(testname, args, test_nested_struct);
+    }
+
+    if (ops->caps & VCAP_LISTS) {
+        sprintf(testname, "%s/nested_struct_list", testname_prefix);
+        args = g_malloc0(sizeof(*args));
+        args->ops = ops;
+        args->test_data = NULL;
+        g_test_add_data_func(testname, args, test_nested_struct_list);
+    }
+}
+
+int main(int argc, char **argv)
+{
+    int i = 0;
+
+    g_test_init(&argc, &argv, NULL);
+
+    while (visitors[i].type != NULL) {
+        add_visitor_type(&visitors[i]);
+        i++;
+    }
+
+    g_test_run();
+
+    return 0;
+}
-- 
1.7.7