44ee2b00db
When cmd/compile generates position-independent code on linux (the -shared flag), it refers to runtime.tlsg as a TLS IE variable. When cmd/link is linking a PIE executable internally, all TLS IE relocations are generated by cmd/compile, and the variable they refer to, runtime.tlsg, is local to the binary. This means we can optimize this particular IE case to LE, and thus implement IE support when internally linking. To do this optimization in the linker, we need to rewrite the PC-relative MOVD to a constant load. This may seem like an unconscionable act born of enthusiasm, but it turns out this is standard operating procedure for linkers. GNU gold does exactly the same optimization. I spent some time reading it and documented at least one missing feature from this version. Part of adding PIE internal linking on linux/amd64. Change-Id: I1eb068d0ec774724944c6b308aa5084582ecde0b Reviewed-on: https://go-review.googlesource.com/28540 Reviewed-by: Ian Lance Taylor <iant@golang.org> Run-TryBot: Ian Lance Taylor <iant@golang.org> Run-TryBot: David Crawshaw <crawshaw@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> |
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README.md
The Go Programming Language
Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.
For documentation about how to install and use Go, visit https://golang.org/ or load doc/install-source.html in your web browser.
Our canonical Git repository is located at https://go.googlesource.com/go. There is a mirror of the repository at https://github.com/golang/go.
Go is the work of hundreds of contributors. We appreciate your help!
To contribute, please read the contribution guidelines: https://golang.org/doc/contribute.html
Note that we do not accept pull requests and that we use the issue tracker for bug reports and proposals only. Please ask questions on https://forum.golangbridge.org or https://groups.google.com/forum/#!forum/golang-nuts.
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 file). 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-source.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 https://golang.org/doc/install or doc/install.html for more details.