3c0fee10db
This adds a "framepointer" GOEXPERIMENT that that makes the amd64 toolchain maintain base pointer chains in the same way that gcc -fno-omit-frame-pointer does. Go doesn't use these saved base pointers, but this does enable external tools like Linux perf and VTune to unwind Go stacks when collecting system-wide profiles. This requires support in the compilers to not clobber BP, support in liblink for generating the BP-saving function prologue and unwinding epilogue, and support in the runtime to save BPs across preemption, to skip saved BPs during stack unwinding and, and to adjust saved BPs during stack moving. As with other GOEXPERIMENTs, everything from the toolchain to the runtime must be compiled with this experiment enabled. To do this, run make.bash (or all.bash) with GOEXPERIMENT=framepointer. Change-Id: I4024853beefb9539949e5ca381adfdd9cfada544 Reviewed-on: https://go-review.googlesource.com/2992 Reviewed-by: Russ Cox <rsc@golang.org> |
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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.)
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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
Please note that we do not use pull requests.
Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.
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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.