go writebarrier_test 源码
golang writebarrier_test 代码
文件路径：/src/cmd/compile/internal/ssa/writebarrier_test.go
// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package ssa
import (
"cmd/compile/internal/types"
"testing"
)
func TestWriteBarrierStoreOrder(t *testing.T) {
// Make sure writebarrier phase works even StoreWB ops are not in dependency order
c := testConfig(t)
ptrType := c.config.Types.BytePtr
fun := c.Fun("entry",
Bloc("entry",
Valu("start", OpInitMem, types.TypeMem, 0, nil),
Valu("sb", OpSB, c.config.Types.Uintptr, 0, nil),
Valu("sp", OpSP, c.config.Types.Uintptr, 0, nil),
Valu("v", OpConstNil, ptrType, 0, nil),
Valu("addr1", OpAddr, ptrType, 0, nil, "sb"),
Valu("wb2", OpStore, types.TypeMem, 0, ptrType, "addr1", "v", "wb1"),
Valu("wb1", OpStore, types.TypeMem, 0, ptrType, "addr1", "v", "start"), // wb1 and wb2 are out of order
Goto("exit")),
Bloc("exit",
Exit("wb2")))
CheckFunc(fun.f)
writebarrier(fun.f)
CheckFunc(fun.f)
}
func TestWriteBarrierPhi(t *testing.T) {
// Make sure writebarrier phase works for single-block loop, where
// a Phi op takes the store in the same block as argument.
// See issue #19067.
c := testConfig(t)
ptrType := c.config.Types.BytePtr
fun := c.Fun("entry",
Bloc("entry",
Valu("start", OpInitMem, types.TypeMem, 0, nil),
Valu("sb", OpSB, c.config.Types.Uintptr, 0, nil),
Valu("sp", OpSP, c.config.Types.Uintptr, 0, nil),
Goto("loop")),
Bloc("loop",
Valu("phi", OpPhi, types.TypeMem, 0, nil, "start", "wb"),
Valu("v", OpConstNil, ptrType, 0, nil),
Valu("addr", OpAddr, ptrType, 0, nil, "sb"),
Valu("wb", OpStore, types.TypeMem, 0, ptrType, "addr", "v", "phi"), // has write barrier
Goto("loop")))
CheckFunc(fun.f)
writebarrier(fun.f)
CheckFunc(fun.f)
}
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