591193b01f
ssa/debug_test.go already had a step limit; this exposes it to individual tests, and it is then set low for the infinite loop tests. That however is not enough; in an infinite loop debuggers see an unchanging line number, and therefore keep trying until they see a different one. To do this, the concept of a "bogus" line number is introduced, and on output single-instruction infinite loops are detected and a hardware nop with correct line number is inserted into the loop; the branch itself receives a bogus line number. This breaks up the endless stream of same line number and causes both gdb and delve to not hang; Delve complains about the incorrect line number while gdb does a sort of odd step-to-nowhere that then steps back to the loop. Since repeats are suppressed in the reference file, a single line is shown there. (The wrong line number mentioned in previous message was an artifact of debug_test.go, not Delve, and is now fixed.) The bogus line number exposed in Delve is less than wonderful, but compared to hanging, it is better. Fixes #30664. Change-Id: I30c927cf8869a84c6c9b84033ee44d7044aab552 Reviewed-on: https://go-review.googlesource.com/c/go/+/168477 Run-TryBot: David Chase <drchase@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Keith Randall <khr@golang.org> |
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