[Qemu-devel] [PATCH 14/25] qapi: add Visitor interfaces for uint*_t and int*_t

[Paolo Bonzini <pbonzini@redhat.com>]

From: Michael Roth <mdroth@linux.vnet.ibm.com>

This adds visitor interfaces for fixed-width integers types.
Implementing these in visitors is optional, otherwise we fall back to
visit_type_int() (int64_t) with some additional bounds checking to avoid
integer overflows for cases where the value fetched exceeds the bounds
of our target C type.

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 hw/mc146818rtc.c       |    7 ---
 qapi/qapi-visit-core.c |  139 ++++++++++++++++++++++++++++++++++++++++++++++++
 qapi/qapi-visit-core.h |   16 ++++++
 3 files changed, 155 insertions(+), 7 deletions(-)

diff --git a/hw/mc146818rtc.c b/hw/mc146818rtc.c
index 9c64e0a..3777f85 100644
--- a/hw/mc146818rtc.c
+++ b/hw/mc146818rtc.c
@@ -599,13 +599,6 @@ static const MemoryRegionOps cmos_ops = {
     .old_portio = cmos_portio
 };
 
-// FIXME add int32 visitor
-static void visit_type_int32(Visitor *v, int *value, const char *name, Error **errp)
-{
-    int64_t val = *value;
-    visit_type_int(v, &val, name, errp);
-}
-
 static void rtc_get_date(Object *obj, Visitor *v, void *opaque,
                          const char *name, Error **errp)
 {
diff --git a/qapi/qapi-visit-core.c b/qapi/qapi-visit-core.c
index a4e088c..9a29674 100644
--- a/qapi/qapi-visit-core.c
+++ b/qapi/qapi-visit-core.c
@@ -97,6 +97,145 @@ void visit_type_int(Visitor *v, int64_t *obj, const char *name, Error **errp)
     }
 }
 
+void visit_type_uint8(Visitor *v, uint8_t *obj, const char *name, Error **errp)
+{
+    int64_t value;
+    if (!error_is_set(errp)) {
+        if (v->type_uint8) {
+            v->type_uint8(v, obj, name, errp);
+        } else {
+            value = *obj;
+            v->type_int(v, &value, name, errp);
+            if (value > UINT8_MAX) {
+                error_set(errp, QERR_INVALID_PARAMETER_VALUE, name ? name : "null",
+                          "uint8_t");
+                return;
+            }
+            *obj = value;
+        }
+    }
+}
+
+void visit_type_uint16(Visitor *v, uint16_t *obj, const char *name, Error **errp)
+{
+    int64_t value;
+    if (!error_is_set(errp)) {
+        if (v->type_uint16) {
+            v->type_uint16(v, obj, name, errp);
+        } else {
+            value = *obj;
+            v->type_int(v, &value, name, errp);
+            if (value > UINT16_MAX) {
+                error_set(errp, QERR_INVALID_PARAMETER_VALUE, name ? name : "null",
+                          "uint16_t");
+                return;
+            }
+            *obj = value;
+        }
+    }
+}
+
+void visit_type_uint32(Visitor *v, uint32_t *obj, const char *name, Error **errp)
+{
+    int64_t value;
+    if (!error_is_set(errp)) {
+        if (v->type_uint32) {
+            v->type_uint32(v, obj, name, errp);
+        } else {
+            value = *obj;
+            v->type_int(v, &value, name, errp);
+            if (value > UINT32_MAX) {
+                error_set(errp, QERR_INVALID_PARAMETER_VALUE, name ? name : "null",
+                          "uint32_t");
+                return;
+            }
+            *obj = value;
+        }
+    }
+}
+
+void visit_type_uint64(Visitor *v, uint64_t *obj, const char *name, Error **errp)
+{
+    int64_t value;
+    if (!error_is_set(errp)) {
+        if (v->type_uint64) {
+            v->type_uint64(v, obj, name, errp);
+        } else {
+            value = *obj;
+            v->type_int(v, &value, name, errp);
+            *obj = value;
+        }
+    }
+}
+
+void visit_type_int8(Visitor *v, int8_t *obj, const char *name, Error **errp)
+{
+    int64_t value;
+    if (!error_is_set(errp)) {
+        if (v->type_int8) {
+            v->type_int8(v, obj, name, errp);
+        } else {
+            value = *obj;
+            v->type_int(v, &value, name, errp);
+            if (value < INT8_MIN || value > INT8_MAX) {
+                error_set(errp, QERR_INVALID_PARAMETER_VALUE, name ? name : "null",
+                          "int8_t");
+                return;
+            }
+            *obj = value;
+        }
+    }
+}
+
+void visit_type_int16(Visitor *v, int16_t *obj, const char *name, Error **errp)
+{
+    int64_t value;
+    if (!error_is_set(errp)) {
+        if (v->type_int16) {
+            v->type_int16(v, obj, name, errp);
+        } else {
+            value = *obj;
+            v->type_int(v, &value, name, errp);
+            if (value < INT16_MIN || value > INT16_MAX) {
+                error_set(errp, QERR_INVALID_PARAMETER_VALUE, name ? name : "null",
+                          "int16_t");
+                return;
+            }
+            *obj = value;
+        }
+    }
+}
+
+void visit_type_int32(Visitor *v, int32_t *obj, const char *name, Error **errp)
+{
+    int64_t value;
+    if (!error_is_set(errp)) {
+        if (v->type_int32) {
+            v->type_int32(v, obj, name, errp);
+        } else {
+            value = *obj;
+            v->type_int(v, &value, name, errp);
+            if (value < INT32_MIN || value > INT32_MAX) {
+                error_set(errp, QERR_INVALID_PARAMETER_VALUE, name ? name : "null",
+                          "int32_t");
+                return;
+            }
+            *obj = value;
+        }
+    }
+}
+
+void visit_type_int64(Visitor *v, int64_t *obj, const char *name, Error **errp)
+{
+    if (!error_is_set(errp)) {
+        if (v->type_int64) {
+            v->type_int64(v, obj, name, errp);
+        } else {
+            v->type_int(v, obj, name, errp);
+        }
+    }
+}
+
 void visit_type_bool(Visitor *v, bool *obj, const char *name, Error **errp)
 {
     if (!error_is_set(errp)) {
diff --git a/qapi/qapi-visit-core.h b/qapi/qapi-visit-core.h
index e850746..a19d70c 100644
--- a/qapi/qapi-visit-core.h
+++ b/qapi/qapi-visit-core.h
@@ -52,6 +52,14 @@ struct Visitor
     void (*start_handle)(Visitor *v, void **obj, const char *kind,
                          const char *name, Error **errp);
     void (*end_handle)(Visitor *v, Error **errp);
+    void (*type_uint8)(Visitor *v, uint8_t *obj, const char *name, Error **errp);
+    void (*type_uint16)(Visitor *v, uint16_t *obj, const char *name, Error **errp);
+    void (*type_uint32)(Visitor *v, uint32_t *obj, const char *name, Error **errp);
+    void (*type_uint64)(Visitor *v, uint64_t *obj, const char *name, Error **errp);
+    void (*type_int8)(Visitor *v, int8_t *obj, const char *name, Error **errp);
+    void (*type_int16)(Visitor *v, int16_t *obj, const char *name, Error **errp);
+    void (*type_int32)(Visitor *v, int32_t *obj, const char *name, Error **errp);
+    void (*type_int64)(Visitor *v, int64_t *obj, const char *name, Error **errp);
 };
 
 void visit_start_handle(Visitor *v, void **obj, const char *kind,
@@ -69,6 +77,14 @@ void visit_end_optional(Visitor *v, Error **errp);
 void visit_type_enum(Visitor *v, int *obj, const char *strings[],
                      const char *kind, const char *name, Error **errp);
 void visit_type_int(Visitor *v, int64_t *obj, const char *name, Error **errp);
+void visit_type_uint8(Visitor *v, uint8_t *obj, const char *name, Error **errp);
+void visit_type_uint16(Visitor *v, uint16_t *obj, const char *name, Error **errp);
+void visit_type_uint32(Visitor *v, uint32_t *obj, const char *name, Error **errp);
+void visit_type_uint64(Visitor *v, uint64_t *obj, const char *name, Error **errp);
+void visit_type_int8(Visitor *v, int8_t *obj, const char *name, Error **errp);
+void visit_type_int16(Visitor *v, int16_t *obj, const char *name, Error **errp);
+void visit_type_int32(Visitor *v, int32_t *obj, const char *name, Error **errp);
+void visit_type_int64(Visitor *v, int64_t *obj, const char *name, Error **errp);
 void visit_type_bool(Visitor *v, bool *obj, const char *name, Error **errp);
 void visit_type_str(Visitor *v, char **obj, const char *name, Error **errp);
 void visit_type_number(Visitor *v, double *obj, const char *name, Error **errp);
-- 
1.7.9.3