97 lines
2.2 KiB
Go
97 lines
2.2 KiB
Go
package wazevoapi
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import (
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"fmt"
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"os"
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"strconv"
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"sync"
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)
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var PerfMap *Perfmap
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func init() {
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if PerfMapEnabled {
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pid := os.Getpid()
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filename := "/tmp/perf-" + strconv.Itoa(pid) + ".map"
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fh, err := os.OpenFile(filename, os.O_APPEND|os.O_RDWR|os.O_CREATE, 0o644)
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if err != nil {
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panic(err)
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}
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PerfMap = &Perfmap{fh: fh}
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}
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}
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// Perfmap holds perfmap entries to be flushed into a perfmap file.
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type Perfmap struct {
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entries []entry
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mux sync.Mutex
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fh *os.File
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}
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type entry struct {
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index int
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offset int64
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size uint64
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name string
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}
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func (f *Perfmap) Lock() {
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f.mux.Lock()
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}
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func (f *Perfmap) Unlock() {
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f.mux.Unlock()
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}
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// AddModuleEntry adds a perfmap entry into the perfmap file.
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// index is the index of the function in the module, offset is the offset of the function in the module,
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// size is the size of the function, and name is the name of the function.
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//
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// Note that the entries are not flushed into the perfmap file until Flush is called,
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// and the entries are module-scoped; Perfmap must be locked until Flush is called.
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func (f *Perfmap) AddModuleEntry(index int, offset int64, size uint64, name string) {
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e := entry{index: index, offset: offset, size: size, name: name}
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if f.entries == nil {
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f.entries = []entry{e}
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return
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}
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f.entries = append(f.entries, e)
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}
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// Flush writes the perfmap entries into the perfmap file where the entries are adjusted by the given `addr` and `functionOffsets`.
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func (f *Perfmap) Flush(addr uintptr, functionOffsets []int) {
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defer func() {
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_ = f.fh.Sync()
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}()
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for _, e := range f.entries {
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if _, err := f.fh.WriteString(fmt.Sprintf("%x %s %s\n",
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uintptr(e.offset)+addr+uintptr(functionOffsets[e.index]),
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strconv.FormatUint(e.size, 16),
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e.name,
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)); err != nil {
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panic(err)
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}
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}
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f.entries = f.entries[:0]
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}
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// Clear clears the perfmap entries not yet flushed.
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func (f *Perfmap) Clear() {
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f.entries = f.entries[:0]
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}
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// AddEntry writes a perfmap entry directly into the perfmap file, not using the entries.
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func (f *Perfmap) AddEntry(addr uintptr, size uint64, name string) {
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_, err := f.fh.WriteString(fmt.Sprintf("%x %s %s\n",
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addr,
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strconv.FormatUint(size, 16),
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name,
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))
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if err != nil {
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panic(err)
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}
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}
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