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// 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 arm
import (
"cmd/compile/internal/gc"
"cmd/internal/obj"
"cmd/internal/obj/arm"
)
func defframe(ptxt *obj.Prog) {
// fill in argument size, stack size
ptxt.To.Type = obj.TYPE_TEXTSIZE
ptxt.To.Val = int32(gc.Rnd(gc.Curfn.Type.ArgWidth(), int64(gc.Widthptr)))
frame := uint32(gc.Rnd(gc.Stksize+gc.Maxarg, int64(gc.Widthreg)))
ptxt.To.Offset = int64(frame)
// insert code to contain ambiguously live variables
// so that garbage collector only sees initialized values
// when it looks for pointers.
p := ptxt
hi := int64(0)
lo := hi
r0 := uint32(0)
for _, n := range gc.Curfn.Func.Dcl {
if !n.Name.Needzero {
continue
}
if n.Class != gc.PAUTO {
gc.Fatalf("needzero class %d", n.Class)
}
if n.Type.Width%int64(gc.Widthptr) != 0 || n.Xoffset%int64(gc.Widthptr) != 0 || n.Type.Width == 0 {
gc.Fatalf("var %L has size %d offset %d", n, int(n.Type.Width), int(n.Xoffset))
}
if lo != hi && n.Xoffset+n.Type.Width >= lo-int64(2*gc.Widthptr) {
// merge with range we already have
lo = gc.Rnd(n.Xoffset, int64(gc.Widthptr))
continue
}
// zero old range
p = zerorange(p, int64(frame), lo, hi, &r0)
// set new range
hi = n.Xoffset + n.Type.Width
lo = n.Xoffset
}
// zero final range
zerorange(p, int64(frame), lo, hi, &r0)
}
func zerorange(p *obj.Prog, frame int64, lo int64, hi int64, r0 *uint32) *obj.Prog {
cnt := hi - lo
if cnt == 0 {
return p
}
if *r0 == 0 {
p = gc.Appendpp(p, arm.AMOVW, obj.TYPE_CONST, 0, 0, obj.TYPE_REG, arm.REG_R0, 0)
*r0 = 1
}
if cnt < int64(4*gc.Widthptr) {
for i := int64(0); i < cnt; i += int64(gc.Widthptr) {
p = gc.Appendpp(p, arm.AMOVW, obj.TYPE_REG, arm.REG_R0, 0, obj.TYPE_MEM, arm.REGSP, 4+frame+lo+i)
}
} else if !gc.Nacl && (cnt <= int64(128*gc.Widthptr)) {
p = gc.Appendpp(p, arm.AADD, obj.TYPE_CONST, 0, 4+frame+lo, obj.TYPE_REG, arm.REG_R1, 0)
p.Reg = arm.REGSP
p = gc.Appendpp(p, obj.ADUFFZERO, obj.TYPE_NONE, 0, 0, obj.TYPE_MEM, 0, 0)
gc.Naddr(&p.To, gc.Sysfunc("duffzero"))
p.To.Offset = 4 * (128 - cnt/int64(gc.Widthptr))
} else {
p = gc.Appendpp(p, arm.AADD, obj.TYPE_CONST, 0, 4+frame+lo, obj.TYPE_REG, arm.REG_R1, 0)
p.Reg = arm.REGSP
p = gc.Appendpp(p, arm.AADD, obj.TYPE_CONST, 0, cnt, obj.TYPE_REG, arm.REG_R2, 0)
p.Reg = arm.REG_R1
p = gc.Appendpp(p, arm.AMOVW, obj.TYPE_REG, arm.REG_R0, 0, obj.TYPE_MEM, arm.REG_R1, 4)
p1 := p
p.Scond |= arm.C_PBIT
p = gc.Appendpp(p, arm.ACMP, obj.TYPE_REG, arm.REG_R1, 0, obj.TYPE_NONE, 0, 0)
p.Reg = arm.REG_R2
p = gc.Appendpp(p, arm.ABNE, obj.TYPE_NONE, 0, 0, obj.TYPE_BRANCH, 0, 0)
gc.Patch(p, p1)
}
return p
}
func zeroAuto(n *gc.Node, pp *obj.Prog) {
// Note: this code must not clobber any registers.
sym := gc.Linksym(n.Sym)
size := n.Type.Size()
p := gc.Prog(arm.AMOVW)
p.From.Type = obj.TYPE_CONST
p.From.Offset = 0
p.To.Type = obj.TYPE_REG
p.To.Reg = arm.REGTMP
for i := int64(0); i < size; i += 4 {
p := gc.AddAsmAfter(arm.AMOVW, pp)
pp = p
p.From.Type = obj.TYPE_REG
p.From.Reg = arm.REGTMP
p.To.Type = obj.TYPE_MEM
p.To.Name = obj.NAME_AUTO
p.To.Reg = arm.REGSP
p.To.Offset = n.Xoffset + i
p.To.Sym = sym
}
}
func ginsnop() {
p := gc.Prog(arm.AAND)
p.From.Type = obj.TYPE_REG
p.From.Reg = arm.REG_R0
p.To.Type = obj.TYPE_REG
p.To.Reg = arm.REG_R0
p.Scond = arm.C_SCOND_EQ
}
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