From 4100f3b78aa840ceb3a84e1bdabc274a848bc01d Mon Sep 17 00:00:00 2001 From: Eric Blake Date: Mon, 19 Feb 2018 23:20:01 -0500 Subject: [PATCH] qapi: Consolidate visitor small integer callbacks Commit 4e27e819 introduced optional visitor callbacks for all sorts of int types, but no visitor has supplied any of the callbacks for sizes less than 64 bits. In other words, the generic implementation based on using type_[u]int64() followed by bounds-checking works just fine. In the interest of simplicity, it's easier to make the visitor callback interface not have to worry about the other sizes. Adding some helper functions minimizes the boilerplate required to correct FIXMEs added earlier with regards to questionable reuse of errp, particularly now that we can guarantee from a single file audit that value is unchanged if an error is set. Backports commit 04e070d217b4414f1f91aa8ad25fc0ae7ca0be93 from qemu --- qemu/include/qapi/visitor-impl.h | 6 -- qemu/qapi/qapi-visit-core.c | 150 +++++++++++-------------------- 2 files changed, 52 insertions(+), 104 deletions(-) diff --git a/qemu/include/qapi/visitor-impl.h b/qemu/include/qapi/visitor-impl.h index f06a3307..1fa8eb57 100644 --- a/qemu/include/qapi/visitor-impl.h +++ b/qemu/include/qapi/visitor-impl.h @@ -55,12 +55,6 @@ struct Visitor /* May be NULL; most useful for input visitors. */ void (*optional)(Visitor *v, bool *present, const char *name); - 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_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); bool (*start_union)(Visitor *v, bool data_present, Error **errp); }; diff --git a/qemu/qapi/qapi-visit-core.c b/qemu/qapi/qapi-visit-core.c index 1ba40ea3..b52a3b4b 100644 --- a/qemu/qapi/qapi-visit-core.c +++ b/qemu/qapi/qapi-visit-core.c @@ -97,67 +97,42 @@ void visit_type_int(Visitor *v, const char *name, int64_t *obj, Error **errp) v->type_int64(v, obj, name, errp); } -void visit_type_uint8(Visitor *v, const char *name, uint8_t *obj, - Error **errp) +static void visit_type_uintN(Visitor *v, uint64_t *obj, const char *name, + uint64_t max, const char *type, Error **errp) { - uint64_t value; + Error *err = NULL; + uint64_t value = *obj; - if (v->type_uint8) { - v->type_uint8(v, obj, name, errp); + v->type_uint64(v, &value, name, &err); + if (err) { + error_propagate(errp, err); + } else if (value > max) { + error_setg(errp, QERR_INVALID_PARAMETER_VALUE, + name ? name : "null", type); } else { - value = *obj; - v->type_uint64(v, &value, name, errp); - if (value > UINT8_MAX) { - /* FIXME questionable reuse of errp if callback changed - value on error */ - error_setg(errp, QERR_INVALID_PARAMETER_VALUE, - name ? name : "null", "uint8_t"); - return; - } - *obj = (uint8_t)value; + *obj = value; } } -void visit_type_uint16(Visitor *v, const char *name, uint16_t *obj, - Error **errp) +void visit_type_uint8(Visitor *v, const char *name, uint8_t *obj, Error **errp) { - uint64_t value; - - if (v->type_uint16) { - v->type_uint16(v, obj, name, errp); - } else { - value = *obj; - v->type_uint64(v, &value, name, errp); - if (value > UINT16_MAX) { - /* FIXME questionable reuse of errp if callback changed - value on error */ - error_setg(errp, QERR_INVALID_PARAMETER_VALUE, - name ? name : "null", "uint16_t"); - return; - } - *obj = (uint16_t)value; - } + uint64_t value = *obj; + visit_type_uintN(v, &value, name, UINT8_MAX, "uint8_t", errp); + *obj = value; } -void visit_type_uint32(Visitor *v, const char *name, uint32_t *obj, - Error **errp) +void visit_type_uint16(Visitor *v, const char *name, uint16_t *obj, Error **errp) { - uint64_t value; + uint64_t value = *obj; + visit_type_uintN(v, &value, name, UINT16_MAX, "uint16_t", errp); + *obj = value; +} - if (v->type_uint32) { - v->type_uint32(v, obj, name, errp); - } else { - value = *obj; - v->type_uint64(v, &value, name, errp); - if (value > UINT32_MAX) { - /* FIXME questionable reuse of errp if callback changed - value on error */ - error_setg(errp, QERR_INVALID_PARAMETER_VALUE, - name ? name : "null", "uint32_t"); - return; - } - *obj = (uint32_t)value; - } +void visit_type_uint32(Visitor *v, const char *name, uint32_t *obj, Error **errp) +{ + uint64_t value = *obj; + visit_type_uintN(v, &value, name, UINT32_MAX, "uint32_t", errp); + *obj = value; } void visit_type_uint64(Visitor *v, const char *name, uint64_t *obj, @@ -166,66 +141,45 @@ void visit_type_uint64(Visitor *v, const char *name, uint64_t *obj, v->type_uint64(v, obj, name, errp); } +static void visit_type_intN(Visitor *v, int64_t *obj, const char *name, + int64_t min, int64_t max, const char *type, + Error **errp) +{ + Error *err = NULL; + int64_t value = *obj; + + v->type_int64(v, &value, name, &err); + if (err) { + error_propagate(errp, err); + } else if (value < min || value > max) { + error_setg(errp, QERR_INVALID_PARAMETER_VALUE, + name ? name : "null", type); + } else { + *obj = value; + } +} + void visit_type_int8(Visitor *v, const char *name, int8_t *obj, Error **errp) { - int64_t value; - - if (v->type_int8) { - v->type_int8(v, obj, name, errp); - } else { - value = *obj; - v->type_int64(v, &value, name, errp); - if (value < INT8_MIN || value > INT8_MAX) { - /* FIXME questionable reuse of errp if callback changed - value on error */ - error_setg(errp, QERR_INVALID_PARAMETER_VALUE, - name ? name : "null", "int8_t"); - return; - } - *obj = (int8_t)value; - } + int64_t value = *obj; + visit_type_intN(v, &value, name, INT8_MIN, INT8_MAX, "int8_t", errp); + *obj = value; } void visit_type_int16(Visitor *v, const char *name, int16_t *obj, Error **errp) { - int64_t value; - - if (v->type_int16) { - v->type_int16(v, obj, name, errp); - } else { - value = *obj; - v->type_int64(v, &value, name, errp); - if (value < INT16_MIN || value > INT16_MAX) { - /* FIXME questionable reuse of errp if callback changed - value on error */ - error_setg(errp, QERR_INVALID_PARAMETER_VALUE, - name ? name : "null", "int16_t"); - return; - } - *obj = (int16_t)value; - } + int64_t value = *obj; + visit_type_intN(v, &value, name, INT16_MIN, INT16_MAX, "int16_t", errp); + *obj = value; } void visit_type_int32(Visitor *v, const char *name, int32_t *obj, Error **errp) { - int64_t value; - - if (v->type_int32) { - v->type_int32(v, obj, name, errp); - } else { - value = *obj; - v->type_int64(v, &value, name, errp); - if (value < INT32_MIN || value > INT32_MAX) { - /* FIXME questionable reuse of errp if callback changed - value on error */ - error_setg(errp, QERR_INVALID_PARAMETER_VALUE, - name ? name : "null", "int32_t"); - return; - } - *obj = (int32_t)value; - } + int64_t value = *obj; + visit_type_intN(v, &value, name, INT32_MIN, INT32_MAX, "int32_t", errp); + *obj = value; } void visit_type_int64(Visitor *v, const char *name, int64_t *obj,