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| author | Cherry Zhang <cherryyz@google.com> | 2021-03-17 19:15:38 -0400 |
|---|---|---|
| committer | Cherry Zhang <cherryyz@google.com> | 2021-03-19 23:21:21 +0000 |
| commit | 6ae3b70ef255cd7317764a12b7230f293683f2c5 (patch) | |
| tree | ba2d6362e17980c0123f9e1b37c3c3a54e4d4214 /src/cmd/compile/internal/amd64 | |
| parent | 9f2a71b6e7b418182dd0467e7d054ccf8130c026 (diff) | |
| download | go-6ae3b70ef255cd7317764a12b7230f293683f2c5.tar.gz go-6ae3b70ef255cd7317764a12b7230f293683f2c5.zip | |
cmd/compile: add clobberdeadreg mode
When -clobberdeadreg flag is set, the compiler inserts code that
clobbers integer registers at call sites. This may be helpful for
debugging register ABI.
Only implemented on AMD64 for now.
Change-Id: Ia203d3f891c30fd95d0103489056fe01d63a2899
Reviewed-on: https://go-review.googlesource.com/c/go/+/302809
Trust: Cherry Zhang <cherryyz@google.com>
Run-TryBot: Cherry Zhang <cherryyz@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: David Chase <drchase@google.com>
Diffstat (limited to 'src/cmd/compile/internal/amd64')
| -rw-r--r-- | src/cmd/compile/internal/amd64/ssa.go | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/cmd/compile/internal/amd64/ssa.go b/src/cmd/compile/internal/amd64/ssa.go index bdd9da77b0..2c767d36d7 100644 --- a/src/cmd/compile/internal/amd64/ssa.go +++ b/src/cmd/compile/internal/amd64/ssa.go @@ -1242,6 +1242,13 @@ func ssaGenValue(s *ssagen.State, v *ssa.Value) { p.To.Reg = x86.REG_SP ssagen.AddAux(&p.To, v) p.To.Offset += 4 + case ssa.OpClobberReg: + x := uint64(0xdeaddeaddeaddead) + p := s.Prog(x86.AMOVQ) + p.From.Type = obj.TYPE_CONST + p.From.Offset = int64(x) + p.To.Type = obj.TYPE_REG + p.To.Reg = v.Reg() default: v.Fatalf("genValue not implemented: %s", v.LongString()) } |