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cmd/compile: use ABI0 for cgo_unsafe_args functions

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cgo_unsafe_args paragma indicates that the function (or its
callee) uses address and offsets to dispatch arguments, which
currently using ABI0 frame layout. Pin them to ABI0.

With this, "GOEXPERIMENT=regabi,regabiargs go run hello.go" works
on Darwin/AMD64.

Change-Id: I3eadd5a3646a9de8fa681fa0a7f46e7cdc217d24
Reviewed-on: https://go-review.googlesource.com/c/go/+/306609
Trust: Cherry Zhang <cherryyz@google.com>
Reviewed-by: Austin Clements <austin@google.com>
Reviewed-by: Than McIntosh <thanm@google.com>
This commit is contained in:
Cherry Zhang 2021-04-01 11:11:04 -04:00
parent 759116b3ac
commit 6996bae5d1
4 changed files with 15 additions and 13 deletions
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14
src/cmd/compile/internal/amd64/ssa.go
View File

@ -824,10 +824,7 @@ func ssaGenValue(s *ssagen.State, v *ssa.Value) {
p.To.Reg = v.Args[0].Reg()
ssagen.AddAux2(&p.To, v, sc.Off64())
case ssa.OpAMD64MOVOstorezero:
if s.ABI != obj.ABIInternal {
v.Fatalf("MOVOstorezero can be only used in ABIInternal functions")
}
if !objabi.Experiment.RegabiG {
if !objabi.Experiment.RegabiG || s.ABI != obj.ABIInternal {
// zero X15 manually
opregreg(s, x86.AXORPS, x86.REG_X15, x86.REG_X15)
}
@ -918,10 +915,7 @@ func ssaGenValue(s *ssagen.State, v *ssa.Value) {
p.To.Type = obj.TYPE_REG
p.To.Reg = v.Reg()
case ssa.OpAMD64DUFFZERO:
if s.ABI != obj.ABIInternal {
v.Fatalf("MOVOconst can be only used in ABIInternal functions")
}
if !objabi.Experiment.RegabiG {
if !objabi.Experiment.RegabiG || s.ABI != obj.ABIInternal {
// zero X15 manually
opregreg(s, x86.AXORPS, x86.REG_X15, x86.REG_X15)
}
@ -1004,8 +998,8 @@ func ssaGenValue(s *ssagen.State, v *ssa.Value) {
// Closure pointer is DX.
ssagen.CheckLoweredGetClosurePtr(v)
case ssa.OpAMD64LoweredGetG:
if objabi.Experiment.RegabiG {
v.Fatalf("LoweredGetG should not appear in new ABI")
if objabi.Experiment.RegabiG && s.ABI == obj.ABIInternal {
v.Fatalf("LoweredGetG should not appear in ABIInternal")
}
r := v.Reg()
getgFromTLS(s, r)

2
src/cmd/compile/internal/ssa/gen/AMD64.rules
View File

@ -460,7 +460,7 @@
(IsInBounds idx len) => (SETB (CMPQ idx len))
(IsSliceInBounds idx len) => (SETBE (CMPQ idx len))
(NilCheck ...) => (LoweredNilCheck ...)
(GetG mem) && !objabi.Experiment.RegabiG => (LoweredGetG mem) // only lower in old ABI. in new ABI we have a G register.
(GetG mem) && !(objabi.Experiment.RegabiG && v.Block.Func.OwnAux.Fn.ABI() == obj.ABIInternal) => (LoweredGetG mem) // only lower in old ABI. in new ABI we have a G register.
(GetClosurePtr ...) => (LoweredGetClosurePtr ...)
(GetCallerPC ...) => (LoweredGetCallerPC ...)
(GetCallerSP ...) => (LoweredGetCallerSP ...)

5
src/cmd/compile/internal/ssa/rewriteAMD64.go
View File

@ -4,6 +4,7 @@
package ssa
import "math"
import "cmd/internal/obj"
import "cmd/internal/objabi"
import "cmd/compile/internal/types"
@ -30465,11 +30466,11 @@ func rewriteValueAMD64_OpFloor(v *Value) bool {
func rewriteValueAMD64_OpGetG(v *Value) bool {
v_0 := v.Args[0]
// match: (GetG mem)
// cond: !objabi.Experiment.RegabiG
// cond: !(objabi.Experiment.RegabiG && v.Block.Func.OwnAux.Fn.ABI() == obj.ABIInternal)
// result: (LoweredGetG mem)
for {
mem := v_0
if !(!objabi.Experiment.RegabiG) {
if !(!(objabi.Experiment.RegabiG && v.Block.Func.OwnAux.Fn.ABI() == obj.ABIInternal)) {
break
}
v.reset(OpAMD64LoweredGetG)

7
src/cmd/compile/internal/ssagen/abi.go
View File

@ -146,6 +146,13 @@ func (s *SymABIs) GenABIWrappers() {
fn.ABI = defABI
}
if fn.Pragma&ir.CgoUnsafeArgs != 0 {
// CgoUnsafeArgs indicates the function (or its callee) uses
// offsets to dispatch arguments, which currently using ABI0
// frame layout. Pin it to ABI0.
fn.ABI = obj.ABI0
}
// Apply references.
if abis, ok := s.refs[symName]; ok {
fn.ABIRefs |= abis