delta/go-git.git, branch dev.link

[dev.link] all: merge branch 'master' into dev.link

2020-10-28T13:12:20+00:00

Clean merge.

Change-Id: Ia7b2808bc649790198d34c226a61d9e569084dc5

cmd/go/internal/modfetch: update expected tags for TestCodeRepoVersions

2020-10-28T12:41:19+00:00

Updates #28856

Change-Id: I89c564cefd7c5777904bc00c74617dab693373bf
Reviewed-on: https://go-review.googlesource.com/c/go/+/265819
Trust: Tobias Klauser 
Run-TryBot: Tobias Klauser 
Reviewed-by: Alberto Donizetti 
Reviewed-by: Bryan C. Mills 
TryBot-Result: Go Bot

cmd/compile,cmd/internal/obj/riscv,runtime: use Duff's devices on riscv64

2020-10-28T05:02:44+00:00

Implement runtime.duffzero and runtime.duffcopy for riscv64.
Use obj.ADUFFZERO/obj.ADUFFCOPY for medium size, word aligned
zeroing/moving.

Change-Id: I42ec622055630c94cb77e286d8d33dbe7c9f846c
Reviewed-on: https://go-review.googlesource.com/c/go/+/237797
Run-TryBot: Cherry Zhang 
Reviewed-by: Joel Sing 
Reviewed-by: Cherry Zhang

cmd/compile: optimize generated struct/array equality code

2020-10-28T04:33:41+00:00

Use a standard "not-equal" label that we can jump to when we
detect that the arguments are not equal. This prevents the
recombination that was noticed in #39428.

Fixes #39428

Change-Id: Ib7c6b3539f4f6046043fd7148f940fcdcab70427
Reviewed-on: https://go-review.googlesource.com/c/go/+/255317
Trust: Keith Randall 
Run-TryBot: Keith Randall 
TryBot-Result: Go Bot 
Reviewed-by: Josh Bleecher Snyder

runtime: move TestNeedmDeadlock to crash_cgo_test.go

2020-10-28T04:20:39+00:00

It requires cgo. Also, skip the test on windows and plan9.

For #42207

Change-Id: I8522773f93bc3f9826506a41a08b86a083262e31
Reviewed-on: https://go-review.googlesource.com/c/go/+/265778
Trust: Ian Lance Taylor 
Run-TryBot: Ian Lance Taylor 
Reviewed-by: Brad Fitzpatrick

cmd/compile: make sure field offset is aligned for structure splitting

2020-10-28T01:22:47+00:00

Always use the aligned form -- the old code sometimes could
at least nominally use a misaligned field in an SSA-able struct,
even if not actually.

Fixes #42181.

Change-Id: Ibdce0985f9349da70921a37423054b85ee4200d0
Reviewed-on: https://go-review.googlesource.com/c/go/+/265277
Reviewed-by: Than McIntosh 
Reviewed-by: Cherry Zhang 
Trust: David Chase

cmd/link: remove all constants of elf

2020-10-28T01:18:38+00:00

Use debug/elf instead.

Related:
CL 252478
CL 265317

Change-Id: If63b0458d9a6e825b40616bfb7a5a2c2e32402b4
Reviewed-on: https://go-review.googlesource.com/c/go/+/265318
Trust: Meng Zhuo 
Run-TryBot: Meng Zhuo 
TryBot-Result: Go Bot 
Reviewed-by: Joel Sing 
Reviewed-by: Ian Lance Taylor

runtime: block signals in needm before allocating M

2020-10-28T01:03:23+00:00

Otherwise, if a signal occurs just after we allocated the M,
we can deadlock if the signal handler needs to allocate an M
itself.

Fixes #42207

Change-Id: I76f44547f419e8b1c14cbf49bf602c6e645d8c14
Reviewed-on: https://go-review.googlesource.com/c/go/+/265759
Trust: Ian Lance Taylor 
Run-TryBot: Ian Lance Taylor 
TryBot-Result: Go Bot 
Reviewed-by: Bryan C. Mills

cmd/go: add -include to cgo whitelist

2020-10-28T00:49:40+00:00

Fixes #39988.

Change-Id: Ia6f5b73e6508f27e3badbcbd29dbeadffd55a932
Reviewed-on: https://go-review.googlesource.com/c/go/+/240739
Trust: Tobias Klauser 
Run-TryBot: Tobias Klauser 
TryBot-Result: Go Bot 
Reviewed-by: Ian Lance Taylor

runtime: handle signal 34 for musl setgid

2020-10-28T00:48:22+00:00

It has been observed that setgid hangs when using cgo with musl.
This fix ensures that signal 34 gets handled in an appropriate way,
like signal 33 when using glibc.

Fixes #39343

Change-Id: I89565663e2c361f62cbccfe80aaedf290bd58d57
Reviewed-on: https://go-review.googlesource.com/c/go/+/236518
Run-TryBot: Tobias Klauser 
TryBot-Result: Go Bot 
Trust: Tobias Klauser 
Reviewed-by: Ian Lance Taylor