| commit | 7799756a50f0a4070d66c67e9615375f852f2c04 | [log] [tgz] |
|---|---|---|
| author | Cherry Zhang <cherryyz@google.com> | Mon Jun 29 17:07:17 2020 -0400 |
| committer | Cherry Zhang <cherryyz@google.com> | Wed Jul 01 14:41:56 2020 +0000 |
| tree | ce59f4d4f6a8298ffeff8faaea43a6b9f0b8cb76 | |
| parent | d7553d9af916682e9f68d1a1aa585a12293ed1f8 [diff] |
cmd/link: fix GC data reading from shared library (attempt 2) When linking against a Go shared library, when a global variable in the main module has a type defined in the shared library, the linker needs to pull the GC data from the shared library to build the GC program for the global variable. Currently, this fails silently, as the shared library file is closed too early and the read failed (with no error check), causing a zero GC map emitted for the variable, which in turn causes the runtime to treat the variable as pointerless. For now, fix this by keeping the file open. In the future we may want to use mmap to read from the shared library instead. Also add error checking. And fix a (mostly harmless) mistake in size caluculation. Also remove an erroneous condition for ARM64. ARM64 used to have a special case to get the addend from the relocation on the gcdata field. That was removed, but the new code accidentally returned 0 unconditionally. It's no longer necessary to have any special case, since the addend is now applied directly to the gcdata field on ARM64, like on all the other platforms. Fixes #39927. This is the second attempt of CL 240462. And this reverts CL 240616. Change-Id: I01c82422b9f67e872d833336885935bc509bc91b Reviewed-on: https://go-review.googlesource.com/c/go/+/240621 Run-TryBot: Cherry Zhang <cherryyz@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Than McIntosh <thanm@google.com>
Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.
Gopher image by Renee French, licensed under Creative Commons 3.0 Attributions license.
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.
Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.
Official binary distributions are available at https://golang.org/dl/.
After downloading a binary release, visit https://golang.org/doc/install or load doc/install.html in your web browser for installation instructions.
If a binary distribution is not available for your combination of operating system and architecture, visit https://golang.org/doc/install/source or load doc/install-source.html in your web browser for source installation instructions.
Go is the work of thousands of contributors. We appreciate your help!
To contribute, please read the contribution guidelines: https://golang.org/doc/contribute.html
Note that the Go project uses the issue tracker for bug reports and proposals only. See https://golang.org/wiki/Questions for a list of places to ask questions about the Go language.