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// Copyright 2025 syzkaller project authors. All rights reserved.
// Use of this source code is governed by Apache 2 LICENSE that can be found in the LICENSE file.
package aflow
import (
"fmt"
"maps"
"reflect"
"slices"
)
type verifyContext struct {
actions map[string]bool
state map[string]*varState
models map[string]bool
err error
}
type varState struct {
action string
typ reflect.Type
used bool
}
func (ctx *verifyContext) errorf(who, msg string, args ...any) {
noteError(&ctx.err, fmt.Sprintf("action %v: %v", who, msg), args...)
}
func (ctx *verifyContext) requireNotEmpty(who, name, value string) {
if value == "" {
ctx.errorf(who, "%v must not be empty", name)
}
}
func (ctx *verifyContext) requireInput(who, name string, typ reflect.Type) {
state := ctx.state[name]
if state == nil {
ctx.errorf(who, "no input %v, available inputs: %v",
name, slices.Collect(maps.Keys(ctx.state)))
return
}
if typ != state.typ {
ctx.errorf(who, "input %v has wrong type: want %v, has %v",
name, typ, state.typ)
}
state.used = true
}
func (ctx *verifyContext) provideOutput(who, name string, typ reflect.Type, unique bool) {
state := ctx.state[name]
if state != nil {
if unique {
ctx.errorf(who, "output %v is already set", name)
} else if typ != state.typ {
ctx.errorf(who, "output %v changes type: %v -> %v",
name, state.typ, typ)
} else if !state.used {
ctx.errorf(state.action, "output %v is unused", name)
}
}
ctx.state[name] = &varState{
action: who,
typ: typ,
}
}
func (ctx *verifyContext) finalize() error {
for name, state := range ctx.state {
if !state.used {
ctx.errorf(state.action, "output %v is unused", name)
}
}
return ctx.err
}
func noteError(errp *error, msg string, args ...any) {
if *errp == nil {
*errp = fmt.Errorf(msg, args...)
}
}
func requireInputs[T any](ctx *verifyContext, who string) {
for name, typ := range foreachFieldOf[T]() {
ctx.requireInput(who, name, typ)
}
}
func provideOutputs[T any](ctx *verifyContext, who string) {
for name, typ := range foreachFieldOf[T]() {
ctx.provideOutput(who, name, typ, true)
}
}
func provideArrayOutputs[T any](ctx *verifyContext, who string) {
for name, typ := range foreachFieldOf[T]() {
ctx.provideOutput(who, name, reflect.SliceOf(typ), true)
}
}
func requireSchema[T any](ctx *verifyContext, who, what string) {
if _, err := schemaFor[T](); err != nil {
ctx.errorf(who, "%v: %v", what, err)
}
}
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