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Iskander Sharipov ff468a43be cmd/compile/internal/gc: better handling of self-assignments in esc.go
Teach escape analysis to recognize these assignment patterns
as not causing the src to leak:

	val.x = val.y
	val.x[i] = val.y[j]
	val.x1.x2 = val.x1.y2
	... etc

Helps to avoid "leaking param" with assignments showed above.
The implementation is based on somewhat similiar xs=xs[a:b]
special case that is ignored by the escape analysis.

We may figure out more generalized version of this,
but this one looks like a safe step into that direction.

Updates #14858

Change-Id: I6fe5bfedec9c03bdc1d7624883324a523bd11fde
Reviewed-on: https://go-review.googlesource.com/126395
Run-TryBot: Iskander Sharipov <iskander.sharipov@intel.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
2018-09-03 14:28:51 +00:00
.github .github: use HTTPS for Stack Overflow link in SUPPORT.md 2018-06-12 11:08:14 +00:00
api syscall: implement Unix Socket for Windows 2018-08-28 09:26:45 +00:00
doc doc: fix os.Pipe() call in the example. 2018-08-31 06:39:16 +00:00
lib/time lib/time: update vendored tzdata to release 2018e 2018-06-11 14:47:06 +00:00
misc all: fix typos detected by github.com/client9/misspell 2018-08-23 15:54:07 +00:00
src cmd/compile/internal/gc: better handling of self-assignments in esc.go 2018-09-03 14:28:51 +00:00
test cmd/compile/internal/gc: better handling of self-assignments in esc.go 2018-09-03 14:28:51 +00:00
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AUTHORS A+C: add VMware as author, Venil Noronha as contributor 2018-08-31 02:14:24 +00:00
CONTRIBUTING.md all: restore changes from faulty merge/revert 2018-02-12 20:13:59 +00:00
CONTRIBUTORS A+C: add VMware as author, Venil Noronha as contributor 2018-08-31 02:14:24 +00:00
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