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cmd/compile: batch write barrier calls

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Have the write barrier call return a pointer to a buffer into which
the generated code records pointers that need write barrier treatment.

Change-Id: I7871764298e0aa1513de417010c8d46b296b199e
Reviewed-on: https://go-review.googlesource.com/c/go/+/447781
Reviewed-by: Keith Randall <khr@google.com>
Run-TryBot: Keith Randall <khr@golang.org>
TryBot-Bypass: Keith Randall <khr@golang.org>
Reviewed-by: Cherry Mui <cherryyz@google.com>
This commit is contained in:
Keith Randall 2022-11-01 16:46:43 -07:00
parent f684f3dc43
commit 21d82e6ac8
42 changed files with 712 additions and 395 deletions
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3
src/cmd/compile/internal/arm/ssa.go
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@ -710,7 +710,8 @@ func ssaGenValue(s *ssagen.State, v *ssa.Value) {
p := s.Prog(obj.ACALL)
p.To.Type = obj.TYPE_MEM
p.To.Name = obj.NAME_EXTERN
p.To.Sym = v.Aux.(*obj.LSym)
// AuxInt encodes how many buffer entries we need.
p.To.Sym = ir.Syms.GCWriteBarrier[v.AuxInt-1]
case ssa.OpARMLoweredPanicBoundsA, ssa.OpARMLoweredPanicBoundsB, ssa.OpARMLoweredPanicBoundsC:
p := s.Prog(obj.ACALL)
p.To.Type = obj.TYPE_MEM