| commit | 0e02cfb369b62c7747d7623cf21ff55f7cabde07 | [log] [tgz] |
|---|---|---|
| author | David Chase <drchase@google.com> | Tue Nov 19 13:23:35 2019 -0500 |
| committer | David Chase <drchase@google.com> | Fri Nov 22 03:06:22 2019 +0000 |
| tree | 0fd5540621aa0528f0fcaa399f0fbf05a9d84611 | |
| parent | bbbc6589dfbc05be2bfa59f51c20f9eaa8d0c531 [diff] |
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>
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