Reproduction Example:
go test -c -gcflags=all="-N -l" -timeout 30s -run ^TestLoadFunctionDefinitions_Heap$ dwarf_repro && ./dwarf_repro.test -test.v
=== RUN TestLoadFunctionDefinitions_Heap
dwarf_test.go:94: After 1000 iterations: base alloc = 1934624, final alloc = 340592, diff = 18446744073707957584
--- PASS: TestLoadFunctionDefinitions_Heap (19.92s)
PASS
| package main | |
| import ( | |
| "debug/dwarf" | |
| "io" | |
| ) | |
| func loadFunctionDefinitions(dwarfData *dwarf.Data) { | |
| entryReader := dwarfData.Reader() | |
| var ( | |
| entry *dwarf.Entry | |
| err error | |
| ) | |
| for { | |
| entry, err = entryReader.Next() | |
| if err == io.EOF || entry == nil { | |
| break | |
| } | |
| } | |
| } |
| // Find the index of the desired sample type | |
| var inuseSpaceIndex int = -1 | |
| for i, st := range prof.SampleType { | |
| if st.Type == "inuse_space" { | |
| fmt.Println("Type for in use:", i) | |
| inuseSpaceIndex = i | |
| break | |
| } else { | |
| fmt.Println("type:", st.Type) | |
| } | |
| } | |
| if inuseSpaceIndex == -1 { | |
| log.Fatalf("sample type not found in profile") | |
| } | |
| // The heap profile contains samples with location info. | |
| // We count objects whose stack traces contain "(*dwarf.Entry)". | |
| var entryCount int64 | |
| for _, sample := range prof.Sample { | |
| for _, loc := range sample.Location { | |
| for _, line := range loc.Line { | |
| if strings.Contains(line.Function.Name, ".entry") { | |
| // For the default heap profile, sample.Value[1] is the number of objects. | |
| if sample.Value[inuseSpaceIndex] > 1 { | |
| entryCount += sample.Value[1] | |
| } | |
| } | |
| } | |
| } | |
| } |
| module dwarf_repro | |
| go 1.24.0 | |
| require github.com/google/pprof v0.0.0-20250208200701-d0013a598941 |
| github.com/go-delve/delve v1.24.0 h1:M1auuI7kyfXZm5LMDQEqhqr4koKWOzGKhCgwMxsLQfo= | |
| github.com/go-delve/delve v1.24.0/go.mod h1:yNWXOuo4yslMOOj7O8gIRrf/trDBrFy5ZXwJL4ZzOos= | |
| github.com/google/pprof v0.0.0-20250208200701-d0013a598941 h1:43XjGa6toxLpeksjcxs1jIoIyr+vUfOqY2c6HB4bpoc= | |
| github.com/google/pprof v0.0.0-20250208200701-d0013a598941/go.mod h1:vavhavw2zAxS5dIdcRluK6cSGGPlZynqzFM8NdvU144= |
| package main |