Source file src/pkg/cmd/vendor/github.com/google/pprof/profile/index.go

     1	// Copyright 2016 Google Inc. All Rights Reserved.
     2	//
     3	// Licensed under the Apache License, Version 2.0 (the "License");
     4	// you may not use this file except in compliance with the License.
     5	// You may obtain a copy of the License at
     6	//
     7	//     http://www.apache.org/licenses/LICENSE-2.0
     8	//
     9	// Unless required by applicable law or agreed to in writing, software
    10	// distributed under the License is distributed on an "AS IS" BASIS,
    11	// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12	// See the License for the specific language governing permissions and
    13	// limitations under the License.
    14	
    15	package profile
    16	
    17	import (
    18		"fmt"
    19		"strconv"
    20		"strings"
    21	)
    22	
    23	// SampleIndexByName returns the appropriate index for a value of sample index.
    24	// If numeric, it returns the number, otherwise it looks up the text in the
    25	// profile sample types.
    26	func (p *Profile) SampleIndexByName(sampleIndex string) (int, error) {
    27		if sampleIndex == "" {
    28			if dst := p.DefaultSampleType; dst != "" {
    29				for i, t := range sampleTypes(p) {
    30					if t == dst {
    31						return i, nil
    32					}
    33				}
    34			}
    35			// By default select the last sample value
    36			return len(p.SampleType) - 1, nil
    37		}
    38		if i, err := strconv.Atoi(sampleIndex); err == nil {
    39			if i < 0 || i >= len(p.SampleType) {
    40				return 0, fmt.Errorf("sample_index %s is outside the range [0..%d]", sampleIndex, len(p.SampleType)-1)
    41			}
    42			return i, nil
    43		}
    44	
    45		// Remove the inuse_ prefix to support legacy pprof options
    46		// "inuse_space" and "inuse_objects" for profiles containing types
    47		// "space" and "objects".
    48		noInuse := strings.TrimPrefix(sampleIndex, "inuse_")
    49		for i, t := range p.SampleType {
    50			if t.Type == sampleIndex || t.Type == noInuse {
    51				return i, nil
    52			}
    53		}
    54	
    55		return 0, fmt.Errorf("sample_index %q must be one of: %v", sampleIndex, sampleTypes(p))
    56	}
    57	
    58	func sampleTypes(p *Profile) []string {
    59		types := make([]string, len(p.SampleType))
    60		for i, t := range p.SampleType {
    61			types[i] = t.Type
    62		}
    63		return types
    64	}
    65	

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