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inspect.go
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inspect.go
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// Copyright (C) 2017 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package validate
import (
"fmt"
"reflect"
"github.com/google/gapid/gapil/analysis"
"github.com/google/gapid/gapil/semantic"
)
// ErrUnreachable is the error raised for unreachable code.
// It wraps an analysis.Unreachable with an error interface.
type ErrUnreachable struct {
analysis.Unreachable
}
func (e ErrUnreachable) Error() string {
switch e.Node.(type) {
case *semantic.Block:
return "Unreachable block"
case semantic.Expression:
return "Unreachable expression"
case semantic.Statement:
return "Unreachable statement"
}
return fmt.Sprintf("Unreachable %v", reflect.TypeOf(e.Node).Name())
}
// Inspect checks the following:
// * There are no unreachable blocks.
// TODO: Check map indices are properly guarded by a check.
func Inspect(api *semantic.API, mappings *semantic.Mappings) Issues {
res := analysis.Analyze(api, mappings)
return inspect(api, mappings, res)
}
func inspect(api *semantic.API, mappings *semantic.Mappings, res *analysis.Results) Issues {
issues := Issues{}
for _, unreachable := range res.Unreachables {
issues.add(unreachable.At, ErrUnreachable{unreachable})
}
return issues
}