David Chase 0e02cfb369 cmd/compile: try harder to not use an empty src.XPos for a bogus line
The fix for #35652 did not guarantee that it was using a non-empty
src position to replace an empty one.  The new code checks again
and falls back to a more certain position.  (The input in question
compiles to a single empty infinite loop, and none of the actual instructions
had any source position at all.  That is a bug, but given the pathology
of this input, not one worth dealing with this late in the release cycle,
if ever.)

Literally:

00000 (5) TEXT "".f(SB), ABIInternal
00001 (5) PCDATA $0, $-2
00002 (5) PCDATA $1, $-2
00003 (5) FUNCDATA $0, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
00004 (5) FUNCDATA $1, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
00005 (5) FUNCDATA $2, gclocals·33cdeccccebe80329f1fdbee7f5874cb(SB)
b2
00006 (?) XCHGL AX, AX
b6
00007 (+1048575) JMP 6
00008 (?) END

TODO: Add runtime.InfiniteLoop(), replace infinite loops with a call to
that, and use an eco-friendly runtime.gopark instead.  (This was Cherry's
excellent idea.)

Updates #35652
Fixes #35695

Change-Id: I4b9a841142ee4df0f6b10863cfa0721a7e13b437
Reviewed-on: https://go-review.googlesource.com/c/go/+/207964
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
2019-11-22 03:06:22 +00:00
..
2019-03-06 18:53:12 +00:00
2019-09-08 17:28:20 +00:00
2018-05-29 02:39:16 +00:00
2015-01-29 13:07:30 +00:00
2019-09-08 17:28:20 +00:00
2018-10-06 15:40:03 +00:00
2015-07-11 14:36:33 +00:00
2015-07-11 14:36:33 +00:00
2019-09-25 17:06:15 +00:00
2019-09-25 17:06:15 +00:00
2019-09-08 17:28:20 +00:00
2018-04-30 19:39:18 +00:00
2019-09-08 17:28:20 +00:00
2019-03-18 20:10:55 +00:00
2019-11-01 20:13:05 +00:00
2014-10-27 18:59:02 -04:00
2018-11-26 14:13:53 +00:00
2018-11-27 15:36:08 +00:00
2018-11-26 14:13:53 +00:00
2018-11-26 14:13:53 +00:00
2019-09-08 17:28:20 +00:00
2018-03-01 21:11:16 +00:00
2018-12-03 16:48:21 +00:00
2019-09-08 17:28:20 +00:00

The test directory contains tests of the Go tool chain and runtime. It includes black box tests, regression tests, and error output tests. They are run as part of all.bash.

To run just these tests, execute:

../bin/go run run.go

Standard library tests should be written as regular Go tests in the appropriate package.

The tool chain and runtime also have regular Go tests in their packages. The main reasons to add a new test to this directory are:

  • it is most naturally expressed using the test runner; or
  • it is also applicable to gccgo and other Go tool chains.