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mapping.go
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mapping.go
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// Copyright 2022-2023 The Parca Authors
// 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 process
import (
"errors"
"github.com/google/pprof/profile"
)
var ErrNotFound = errors.New("not found")
type MappingCache interface {
MappingForPID(pid int) ([]*profile.Mapping, error)
}
type Mapping struct {
cache MappingCache
pidMappings map[int][]*profile.Mapping
pids []int
}
func NewMapping(cache MappingCache) *Mapping {
return &Mapping{
cache: cache,
pidMappings: map[int][]*profile.Mapping{},
pids: []int{},
}
}
func (m *Mapping) PIDAddrMapping(pid int, addr uint64) (*profile.Mapping, error) {
maps, ok := m.pidMappings[pid]
if !ok {
var err error
maps, err = m.cache.MappingForPID(pid)
if err != nil {
return nil, err
}
m.pidMappings[pid] = maps
m.pids = append(m.pids, pid)
}
return mappingForAddr(maps, addr), nil
}
type Map struct {
PID int
Mapping *profile.Mapping
}
func (m *Mapping) allMappings() ([]*profile.Mapping, []Map) {
res := []*profile.Mapping{}
mappedFiles := []Map{}
i := uint64(1) // Mapping IDs need to start with 1 in pprof.
for _, pid := range m.pids {
maps := m.pidMappings[pid]
for _, mapping := range maps {
if mapping.BuildID != "" {
mappedFiles = append(mappedFiles, Map{
PID: pid,
Mapping: mapping,
})
}
// TODO(brancz): Do we need to handle potentially duplicate
// vdso/vsyscall mappings?
mapping.ID = i
res = append(res, mapping)
i++
}
}
return res, mappedFiles
}
func (m *Mapping) MappingsForPID(pid int) []*profile.Mapping {
res := []*profile.Mapping{}
i := uint64(1) // Mapping IDs need to start with 1 in pprof.
maps := m.pidMappings[pid]
for _, mapping := range maps {
// TODO(brancz): Do we need to handle potentially duplicate vdso/vsyscall mappings?
mapping.ID = i
res = append(res, mapping)
i++
}
return res
}
func (m *Mapping) MapsForPID(pid int) []Map {
mappedFiles := []Map{}
maps := m.pidMappings[pid]
for _, mapping := range maps {
if mapping.BuildID != "" {
mappedFiles = append(mappedFiles, Map{
PID: pid,
Mapping: mapping,
})
}
}
return mappedFiles
}
func mappingForAddr(mapping []*profile.Mapping, addr uint64) *profile.Mapping {
for _, m := range mapping {
if m.Start <= addr && m.Limit >= addr {
return m
}
}
return nil
}