go ggen 源码
golang ggen 代码
文件路径：/src/cmd/compile/internal/arm64/ggen.go
// Copyright 2009 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 arm64
import (
"cmd/compile/internal/ir"
"cmd/compile/internal/objw"
"cmd/compile/internal/types"
"cmd/internal/obj"
"cmd/internal/obj/arm64"
"internal/buildcfg"
)
var darwin = buildcfg.GOOS == "darwin" || buildcfg.GOOS == "ios"
func padframe(frame int64) int64 {
// arm64 requires that the frame size (not counting saved FP&LR)
// be 16 bytes aligned. If not, pad it.
if frame%16 != 0 {
frame += 16 - (frame % 16)
}
return frame
}
func zerorange(pp *objw.Progs, p *obj.Prog, off, cnt int64, _ *uint32) *obj.Prog {
if cnt == 0 {
return p
}
if cnt < int64(4*types.PtrSize) {
for i := int64(0); i < cnt; i += int64(types.PtrSize) {
p = pp.Append(p, arm64.AMOVD, obj.TYPE_REG, arm64.REGZERO, 0, obj.TYPE_MEM, arm64.REGSP, 8+off+i)
}
} else if cnt <= int64(128*types.PtrSize) && !darwin { // darwin ld64 cannot handle BR26 reloc with non-zero addend
if cnt%(2*int64(types.PtrSize)) != 0 {
p = pp.Append(p, arm64.AMOVD, obj.TYPE_REG, arm64.REGZERO, 0, obj.TYPE_MEM, arm64.REGSP, 8+off)
off += int64(types.PtrSize)
cnt -= int64(types.PtrSize)
}
p = pp.Append(p, arm64.AMOVD, obj.TYPE_REG, arm64.REGSP, 0, obj.TYPE_REG, arm64.REG_R20, 0)
p = pp.Append(p, arm64.AADD, obj.TYPE_CONST, 0, 8+off, obj.TYPE_REG, arm64.REG_R20, 0)
p.Reg = arm64.REG_R20
p = pp.Append(p, obj.ADUFFZERO, obj.TYPE_NONE, 0, 0, obj.TYPE_MEM, 0, 0)
p.To.Name = obj.NAME_EXTERN
p.To.Sym = ir.Syms.Duffzero
p.To.Offset = 4 * (64 - cnt/(2*int64(types.PtrSize)))
} else {
// Not using REGTMP, so this is async preemptible (async preemption clobbers REGTMP).
// We are at the function entry, where no register is live, so it is okay to clobber
// other registers
const rtmp = arm64.REG_R20
p = pp.Append(p, arm64.AMOVD, obj.TYPE_CONST, 0, 8+off-8, obj.TYPE_REG, rtmp, 0)
p = pp.Append(p, arm64.AMOVD, obj.TYPE_REG, arm64.REGSP, 0, obj.TYPE_REG, arm64.REGRT1, 0)
p = pp.Append(p, arm64.AADD, obj.TYPE_REG, rtmp, 0, obj.TYPE_REG, arm64.REGRT1, 0)
p.Reg = arm64.REGRT1
p = pp.Append(p, arm64.AMOVD, obj.TYPE_CONST, 0, cnt, obj.TYPE_REG, rtmp, 0)
p = pp.Append(p, arm64.AADD, obj.TYPE_REG, rtmp, 0, obj.TYPE_REG, arm64.REGRT2, 0)
p.Reg = arm64.REGRT1
p = pp.Append(p, arm64.AMOVD, obj.TYPE_REG, arm64.REGZERO, 0, obj.TYPE_MEM, arm64.REGRT1, int64(types.PtrSize))
p.Scond = arm64.C_XPRE
p1 := p
p = pp.Append(p, arm64.ACMP, obj.TYPE_REG, arm64.REGRT1, 0, obj.TYPE_NONE, 0, 0)
p.Reg = arm64.REGRT2
p = pp.Append(p, arm64.ABNE, obj.TYPE_NONE, 0, 0, obj.TYPE_BRANCH, 0, 0)
p.To.SetTarget(p1)
}
return p
}
func ginsnop(pp *objw.Progs) *obj.Prog {
p := pp.Prog(arm64.AHINT)
p.From.Type = obj.TYPE_CONST
return p
}
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