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// Copyright 2017 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package runtime_test import ( "reflect" . "runtime" "testing" "time" "unsafe" ) func TestProfBuf(t *testing.T) { const hdrSize = 2 write := func(t *testing.T, b *ProfBuf, tag unsafe.Pointer, now int64, hdr []uint64, stk []uintptr) { b.Write(&tag, now, hdr, stk) } read := func(t *testing.T, b *ProfBuf, data []uint64, tags []unsafe.Pointer) { rdata, rtags, eof := b.Read(ProfBufNonBlocking) if !reflect.DeepEqual(rdata, data) || !reflect.DeepEqual(rtags, tags) { t.Fatalf("unexpected profile read:\nhave data %#x\nwant data %#x\nhave tags %#x\nwant tags %#x", rdata, data, rtags, tags) } if eof { t.Fatalf("unexpected eof") } } readBlock := func(t *testing.T, b *ProfBuf, data []uint64, tags []unsafe.Pointer) func() { c := make(chan int) go func() { eof := data == nil rdata, rtags, reof := b.Read(ProfBufBlocking) if !reflect.DeepEqual(rdata, data) || !reflect.DeepEqual(rtags, tags) || reof != eof { // Errorf, not Fatalf, because called in goroutine. t.Errorf("unexpected profile read:\nhave data %#x\nwant data %#x\nhave tags %#x\nwant tags %#x\nhave eof=%v, want %v", rdata, data, rtags, tags, reof, eof) } c <- 1 }() time.Sleep(10 * time.Millisecond) // let goroutine run and block return func() { <-c } } readEOF := func(t *testing.T, b *ProfBuf) { rdata, rtags, eof := b.Read(ProfBufBlocking) if rdata != nil || rtags != nil || !eof { t.Errorf("unexpected profile read: %#x, %#x, eof=%v; want nil, nil, eof=true", rdata, rtags, eof) } rdata, rtags, eof = b.Read(ProfBufNonBlocking) if rdata != nil || rtags != nil || !eof { t.Errorf("unexpected profile read (non-blocking): %#x, %#x, eof=%v; want nil, nil, eof=true", rdata, rtags, eof) } } myTags := make([]byte, 100) t.Logf("myTags is %p", &myTags[0]) t.Run("BasicWriteRead", func(t *testing.T) { b := NewProfBuf(2, 11, 1) write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) read(t, b, nil, nil) // release data returned by previous read write(t, b, unsafe.Pointer(&myTags[2]), 99, []uint64{101, 102}, []uintptr{201, 202, 203, 204}) read(t, b, []uint64{8, 99, 101, 102, 201, 202, 203, 204}, []unsafe.Pointer{unsafe.Pointer(&myTags[2])}) }) t.Run("ReadMany", func(t *testing.T) { b := NewProfBuf(2, 50, 50) write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) write(t, b, unsafe.Pointer(&myTags[2]), 99, []uint64{101, 102}, []uintptr{201, 202, 203, 204}) write(t, b, unsafe.Pointer(&myTags[1]), 500, []uint64{502, 504}, []uintptr{506}) read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 8, 99, 101, 102, 201, 202, 203, 204, 5, 500, 502, 504, 506}, []unsafe.Pointer{unsafe.Pointer(&myTags[0]), unsafe.Pointer(&myTags[2]), unsafe.Pointer(&myTags[1])}) }) t.Run("ReadManyShortData", func(t *testing.T) { b := NewProfBuf(2, 50, 50) write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) write(t, b, unsafe.Pointer(&myTags[2]), 99, []uint64{101, 102}, []uintptr{201, 202, 203, 204}) read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 8, 99, 101, 102, 201, 202, 203, 204}, []unsafe.Pointer{unsafe.Pointer(&myTags[0]), unsafe.Pointer(&myTags[2])}) }) t.Run("ReadManyShortTags", func(t *testing.T) { b := NewProfBuf(2, 50, 50) write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) write(t, b, unsafe.Pointer(&myTags[2]), 99, []uint64{101, 102}, []uintptr{201, 202, 203, 204}) read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9, 8, 99, 101, 102, 201, 202, 203, 204}, []unsafe.Pointer{unsafe.Pointer(&myTags[0]), unsafe.Pointer(&myTags[2])}) }) t.Run("ReadAfterOverflow1", func(t *testing.T) { // overflow record synthesized by write b := NewProfBuf(2, 16, 5) write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) // uses 10 read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) // reads 10 but still in use until next read write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5}) // uses 6 read(t, b, []uint64{6, 1, 2, 3, 4, 5}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) // reads 6 but still in use until next read // now 10 available write(t, b, unsafe.Pointer(&myTags[2]), 99, []uint64{101, 102}, []uintptr{201, 202, 203, 204, 205, 206, 207, 208, 209}) // no room for i := 0; i < 299; i++ { write(t, b, unsafe.Pointer(&myTags[3]), int64(100+i), []uint64{101, 102}, []uintptr{201, 202, 203, 204}) // no room for overflow+this record } write(t, b, unsafe.Pointer(&myTags[1]), 500, []uint64{502, 504}, []uintptr{506}) // room for overflow+this record read(t, b, []uint64{5, 99, 0, 0, 300, 5, 500, 502, 504, 506}, []unsafe.Pointer{nil, unsafe.Pointer(&myTags[1])}) }) t.Run("ReadAfterOverflow2", func(t *testing.T) { // overflow record synthesized by read b := NewProfBuf(2, 16, 5) write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) write(t, b, unsafe.Pointer(&myTags[2]), 99, []uint64{101, 102}, []uintptr{201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213}) for i := 0; i < 299; i++ { write(t, b, unsafe.Pointer(&myTags[3]), 100, []uint64{101, 102}, []uintptr{201, 202, 203, 204}) } read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) // reads 10 but still in use until next read write(t, b, unsafe.Pointer(&myTags[1]), 500, []uint64{502, 504}, []uintptr{}) // still overflow read(t, b, []uint64{5, 99, 0, 0, 301}, []unsafe.Pointer{nil}) // overflow synthesized by read write(t, b, unsafe.Pointer(&myTags[1]), 500, []uint64{502, 505}, []uintptr{506}) // written read(t, b, []uint64{5, 500, 502, 505, 506}, []unsafe.Pointer{unsafe.Pointer(&myTags[1])}) }) t.Run("ReadAtEndAfterOverflow", func(t *testing.T) { b := NewProfBuf(2, 12, 5) write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) write(t, b, unsafe.Pointer(&myTags[2]), 99, []uint64{101, 102}, []uintptr{201, 202, 203, 204}) for i := 0; i < 299; i++ { write(t, b, unsafe.Pointer(&myTags[3]), 100, []uint64{101, 102}, []uintptr{201, 202, 203, 204}) } read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) read(t, b, []uint64{5, 99, 0, 0, 300}, []unsafe.Pointer{nil}) write(t, b, unsafe.Pointer(&myTags[1]), 500, []uint64{502, 504}, []uintptr{506}) read(t, b, []uint64{5, 500, 502, 504, 506}, []unsafe.Pointer{unsafe.Pointer(&myTags[1])}) }) t.Run("BlockingWriteRead", func(t *testing.T) { b := NewProfBuf(2, 11, 1) wait := readBlock(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) wait() wait = readBlock(t, b, []uint64{8, 99, 101, 102, 201, 202, 203, 204}, []unsafe.Pointer{unsafe.Pointer(&myTags[2])}) time.Sleep(10 * time.Millisecond) write(t, b, unsafe.Pointer(&myTags[2]), 99, []uint64{101, 102}, []uintptr{201, 202, 203, 204}) wait() wait = readBlock(t, b, nil, nil) b.Close() wait() wait = readBlock(t, b, nil, nil) wait() readEOF(t, b) }) t.Run("DataWraparound", func(t *testing.T) { b := NewProfBuf(2, 16, 1024) for i := 0; i < 10; i++ { write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) read(t, b, nil, nil) // release data returned by previous read } }) t.Run("TagWraparound", func(t *testing.T) { b := NewProfBuf(2, 1024, 2) for i := 0; i < 10; i++ { write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) read(t, b, nil, nil) // release data returned by previous read } }) t.Run("BothWraparound", func(t *testing.T) { b := NewProfBuf(2, 16, 2) for i := 0; i < 10; i++ { write(t, b, unsafe.Pointer(&myTags[0]), 1, []uint64{2, 3}, []uintptr{4, 5, 6, 7, 8, 9}) read(t, b, []uint64{10, 1, 2, 3, 4, 5, 6, 7, 8, 9}, []unsafe.Pointer{unsafe.Pointer(&myTags[0])}) read(t, b, nil, nil) // release data returned by previous read } }) }