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[dev.regabi] cmd/compile: add code to support register ABI spills around morestack calls

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This is a selected copy from the register ABI experiment CL, focused
on the files and data structures that handle spilling around morestack.
Unnecessary code from the experiment was removed, other code was adapted.

Would it make sense to leave comments in the experiment as pieces are
brought over?

Experiment CL (for comparison purposes)
https://go-review.googlesource.com/c/go/+/28832

Change-Id: I92136f070351d4fcca1407b52ecf9b80898fed95
Reviewed-on: https://go-review.googlesource.com/c/go/+/279520
Trust: David Chase <drchase@google.com>
Run-TryBot: David Chase <drchase@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Jeremy Faller <jeremy@golang.org>
This commit is contained in:
David Chase 2020-09-28 17:42:30 -04:00
parent 2abd24f3b7
commit c1370e918f
4 changed files with 76 additions and 7 deletions
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3
src/cmd/compile/internal/ssa/func.go
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@ -58,6 +58,9 @@ type Func struct {
// of keys to make iteration order deterministic.
Names []LocalSlot
// RegArgs is a slice of register-memory pairs that must be spilled and unspilled in the uncommon path of function entry.
RegArgs []ArgPair
// WBLoads is a list of Blocks that branch on the write
// barrier flag. Safe-points are disabled from the OpLoad that
// reads the write-barrier flag until the control flow rejoins