go index 源码
golang index 代码
文件路径：/src/cmd/vendor/github.com/google/pprof/profile/index.go
// Copyright 2016 Google Inc. All Rights Reserved.
//
// 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 profile
import (
"fmt"
"strconv"
"strings"
)
// SampleIndexByName returns the appropriate index for a value of sample index.
// If numeric, it returns the number, otherwise it looks up the text in the
// profile sample types.
func (p *Profile) SampleIndexByName(sampleIndex string) (int, error) {
if sampleIndex == "" {
if dst := p.DefaultSampleType; dst != "" {
for i, t := range sampleTypes(p) {
if t == dst {
return i, nil
}
}
}
// By default select the last sample value
return len(p.SampleType) - 1, nil
}
if i, err := strconv.Atoi(sampleIndex); err == nil {
if i < 0 || i >= len(p.SampleType) {
return 0, fmt.Errorf("sample_index %s is outside the range [0..%d]", sampleIndex, len(p.SampleType)-1)
}
return i, nil
}
// Remove the inuse_ prefix to support legacy pprof options
// "inuse_space" and "inuse_objects" for profiles containing types
// "space" and "objects".
noInuse := strings.TrimPrefix(sampleIndex, "inuse_")
for i, t := range p.SampleType {
if t.Type == sampleIndex || t.Type == noInuse {
return i, nil
}
}
return 0, fmt.Errorf("sample_index %q must be one of: %v", sampleIndex, sampleTypes(p))
}
func sampleTypes(p *Profile) []string {
types := make([]string, len(p.SampleType))
for i, t := range p.SampleType {
types[i] = t.Type
}
return types
}
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