c2047754c3
Compiler changes:
* Change map assignment to use mapassign and assign value directly.
* Change string iteration to use decoderune, faster for ASCII strings.
* Change makeslice to take int, and use makeslice64 for larger values.
* Add new noverflow field to hmap struct used for maps.
Unresolved problems, to be fixed later:
* Commented out test in go/types/sizes_test.go that doesn't compile.
* Commented out reflect.TestStructOf test for padding after zero-sized field.
Reviewed-on: https://go-review.googlesource.com/35231
gotools/:
Updates for Go 1.8rc1.
* Makefile.am (go_cmd_go_files): Add bug.go.
(s-zdefaultcc): Write defaultPkgConfig.
* Makefile.in: Rebuild.
From-SVN: r244456
43 lines
1.2 KiB
Go
43 lines
1.2 KiB
Go
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Go execution tracer.
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// The tracer captures a wide range of execution events like goroutine
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// creation/blocking/unblocking, syscall enter/exit/block, GC-related events,
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// changes of heap size, processor start/stop, etc and writes them to an io.Writer
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// in a compact form. A precise nanosecond-precision timestamp and a stack
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// trace is captured for most events. A trace can be analyzed later with
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// 'go tool trace' command.
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package trace
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import (
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"io"
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"runtime"
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)
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// Start enables tracing for the current program.
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// While tracing, the trace will be buffered and written to w.
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// Start returns an error if tracing is already enabled.
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func Start(w io.Writer) error {
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if err := runtime.StartTrace(); err != nil {
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return err
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}
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go func() {
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for {
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data := runtime.ReadTrace()
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if data == nil {
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break
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}
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w.Write(data)
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}
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}()
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return nil
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}
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// Stop stops the current tracing, if any.
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// Stop only returns after all the writes for the trace have completed.
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func Stop() {
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runtime.StopTrace()
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}
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