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The Go programming language
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Time is a tiny struct, so the compiler copies a Time by copying each of the three fields. The layout of a time on amd64 is [ptr int32 gap32 ptr]. Copying a Time onto a location that formerly held a pointer in the second word changes only the low 32 bits, creating a different but still plausible pointer. This confuses the garbage collector when it appears in argument or result frames. To avoid this problem, declare nsec as uintptr, so that there is no gap on amd64 anymore, and therefore no partial pointers. Note that rearranging the fields to put the int32 last still leaves a gap - [ptr ptr int32 gap32] - because Time must have a total size that is ptr-width aligned. Update #5749 This CL is enough to fix the problem, but we should still do the other actions listed in the initial report. We're not too far from completely precise collection. R=golang-dev, dvyukov, r CC=golang-dev https://golang.org/cl/10504043 |
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This is the source code repository for the Go programming language.
For documentation about how to install and use Go,
visit http://golang.org/ or load doc/install.html in your web browser.
After installing Go, you can view a nicely formatted
doc/install.html by running godoc --http=:6060
and then visiting http://localhost:6060/doc/install.html.
Unless otherwise noted, the Go source files are distributed
under the BSD-style license found in the LICENSE file.
--
Binary Distribution Notes
If you have just untarred a binary Go distribution, you need to set
the environment variable $GOROOT to the full path of the go
directory (the one containing this README). You can omit the
variable if you unpack it into /usr/local/go, or if you rebuild
from sources by running all.bash (see doc/install.html).
You should also add the Go binary directory $GOROOT/bin
to your shell's path.
For example, if you extracted the tar file into $HOME/go, you might
put the following in your .profile:
export GOROOT=$HOME/go
export PATH=$PATH:$GOROOT/bin
See doc/install.html for more details.