| // 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 main |
| |
| import ( |
| "cmd/internal/obj" |
| "cmd/internal/obj/arm" |
| "fmt" |
| ) |
| import "cmd/internal/gc" |
| |
| /* |
| * peep.c |
| */ |
| /* |
| * generate: |
| * res = n; |
| * simplifies and calls gmove. |
| */ |
| func cgen(n *gc.Node, res *gc.Node) { |
| if gc.Debug['g'] != 0 { |
| gc.Dump("\ncgen-n", n) |
| gc.Dump("cgen-res", res) |
| } |
| |
| var n1 gc.Node |
| var nr *gc.Node |
| var nl *gc.Node |
| var a int |
| var f1 gc.Node |
| var f0 gc.Node |
| var n2 gc.Node |
| if n == nil || n.Type == nil { |
| goto ret |
| } |
| |
| if res == nil || res.Type == nil { |
| gc.Fatal("cgen: res nil") |
| } |
| |
| switch n.Op { |
| case gc.OSLICE, |
| gc.OSLICEARR, |
| gc.OSLICESTR, |
| gc.OSLICE3, |
| gc.OSLICE3ARR: |
| if res.Op != gc.ONAME || res.Addable == 0 { |
| var n1 gc.Node |
| gc.Tempname(&n1, n.Type) |
| gc.Cgen_slice(n, &n1) |
| cgen(&n1, res) |
| } else { |
| gc.Cgen_slice(n, res) |
| } |
| return |
| |
| case gc.OEFACE: |
| if res.Op != gc.ONAME || res.Addable == 0 { |
| var n1 gc.Node |
| gc.Tempname(&n1, n.Type) |
| gc.Cgen_eface(n, &n1) |
| cgen(&n1, res) |
| } else { |
| gc.Cgen_eface(n, res) |
| } |
| return |
| } |
| |
| for n.Op == gc.OCONVNOP { |
| n = n.Left |
| } |
| |
| if n.Ullman >= gc.UINF { |
| if n.Op == gc.OINDREG { |
| gc.Fatal("cgen: this is going to misscompile") |
| } |
| if res.Ullman >= gc.UINF { |
| var n1 gc.Node |
| gc.Tempname(&n1, n.Type) |
| cgen(n, &n1) |
| cgen(&n1, res) |
| goto ret |
| } |
| } |
| |
| if gc.Isfat(n.Type) { |
| if n.Type.Width < 0 { |
| gc.Fatal("forgot to compute width for %v", gc.Tconv(n.Type, 0)) |
| } |
| sgen(n, res, n.Type.Width) |
| goto ret |
| } |
| |
| // update addressability for string, slice |
| // can't do in walk because n->left->addable |
| // changes if n->left is an escaping local variable. |
| switch n.Op { |
| case gc.OSPTR, |
| gc.OLEN: |
| if gc.Isslice(n.Left.Type) || gc.Istype(n.Left.Type, gc.TSTRING) { |
| n.Addable = n.Left.Addable |
| } |
| |
| case gc.OCAP: |
| if gc.Isslice(n.Left.Type) { |
| n.Addable = n.Left.Addable |
| } |
| |
| case gc.OITAB: |
| n.Addable = n.Left.Addable |
| } |
| |
| // if both are addressable, move |
| if n.Addable != 0 && res.Addable != 0 { |
| if gc.Is64(n.Type) || gc.Is64(res.Type) || n.Op == gc.OREGISTER || res.Op == gc.OREGISTER || gc.Iscomplex[n.Type.Etype] != 0 || gc.Iscomplex[res.Type.Etype] != 0 { |
| gmove(n, res) |
| } else { |
| var n1 gc.Node |
| regalloc(&n1, n.Type, nil) |
| gmove(n, &n1) |
| cgen(&n1, res) |
| regfree(&n1) |
| } |
| |
| goto ret |
| } |
| |
| // if both are not addressable, use a temporary. |
| if n.Addable == 0 && res.Addable == 0 { |
| // could use regalloc here sometimes, |
| // but have to check for ullman >= UINF. |
| var n1 gc.Node |
| gc.Tempname(&n1, n.Type) |
| |
| cgen(n, &n1) |
| cgen(&n1, res) |
| return |
| } |
| |
| // if result is not addressable directly but n is, |
| // compute its address and then store via the address. |
| if res.Addable == 0 { |
| var n1 gc.Node |
| igen(res, &n1, nil) |
| cgen(n, &n1) |
| regfree(&n1) |
| return |
| } |
| |
| if gc.Complexop(n, res) { |
| gc.Complexgen(n, res) |
| return |
| } |
| |
| // if n is sudoaddable generate addr and move |
| if !gc.Is64(n.Type) && !gc.Is64(res.Type) && gc.Iscomplex[n.Type.Etype] == 0 && gc.Iscomplex[res.Type.Etype] == 0 { |
| a := optoas(gc.OAS, n.Type) |
| var w int |
| var addr obj.Addr |
| if sudoaddable(a, n, &addr, &w) { |
| if res.Op != gc.OREGISTER { |
| var n2 gc.Node |
| regalloc(&n2, res.Type, nil) |
| p1 := gins(a, nil, &n2) |
| p1.From = addr |
| if gc.Debug['g'] != 0 { |
| fmt.Printf("%v [ignore previous line]\n", p1) |
| } |
| gmove(&n2, res) |
| regfree(&n2) |
| } else { |
| p1 := gins(a, nil, res) |
| p1.From = addr |
| if gc.Debug['g'] != 0 { |
| fmt.Printf("%v [ignore previous line]\n", p1) |
| } |
| } |
| |
| sudoclean() |
| goto ret |
| } |
| } |
| |
| // otherwise, the result is addressable but n is not. |
| // let's do some computation. |
| |
| nl = n.Left |
| |
| nr = n.Right |
| |
| if nl != nil && nl.Ullman >= gc.UINF { |
| if nr != nil && nr.Ullman >= gc.UINF { |
| var n1 gc.Node |
| gc.Tempname(&n1, nl.Type) |
| cgen(nl, &n1) |
| n2 := *n |
| n2.Left = &n1 |
| cgen(&n2, res) |
| goto ret |
| } |
| } |
| |
| // 64-bit ops are hard on 32-bit machine. |
| if gc.Is64(n.Type) || gc.Is64(res.Type) || n.Left != nil && gc.Is64(n.Left.Type) { |
| switch n.Op { |
| // math goes to cgen64. |
| case gc.OMINUS, |
| gc.OCOM, |
| gc.OADD, |
| gc.OSUB, |
| gc.OMUL, |
| gc.OLROT, |
| gc.OLSH, |
| gc.ORSH, |
| gc.OAND, |
| gc.OOR, |
| gc.OXOR: |
| cgen64(n, res) |
| |
| return |
| } |
| } |
| |
| if nl != nil && gc.Isfloat[n.Type.Etype] != 0 && gc.Isfloat[nl.Type.Etype] != 0 { |
| goto flt |
| } |
| switch n.Op { |
| default: |
| gc.Dump("cgen", n) |
| gc.Fatal("cgen: unknown op %v", gc.Nconv(n, obj.FmtShort|obj.FmtSign)) |
| |
| case gc.OREAL, |
| gc.OIMAG, |
| gc.OCOMPLEX: |
| gc.Fatal("unexpected complex") |
| |
| // these call bgen to get a bool value |
| case gc.OOROR, |
| gc.OANDAND, |
| gc.OEQ, |
| gc.ONE, |
| gc.OLT, |
| gc.OLE, |
| gc.OGE, |
| gc.OGT, |
| gc.ONOT: |
| p1 := gc.Gbranch(arm.AB, nil, 0) |
| |
| p2 := gc.Pc |
| gmove(gc.Nodbool(true), res) |
| p3 := gc.Gbranch(arm.AB, nil, 0) |
| gc.Patch(p1, gc.Pc) |
| bgen(n, true, 0, p2) |
| gmove(gc.Nodbool(false), res) |
| gc.Patch(p3, gc.Pc) |
| goto ret |
| |
| case gc.OPLUS: |
| cgen(nl, res) |
| goto ret |
| |
| // unary |
| case gc.OCOM: |
| a := optoas(gc.OXOR, nl.Type) |
| |
| regalloc(&n1, nl.Type, nil) |
| cgen(nl, &n1) |
| gc.Nodconst(&n2, nl.Type, -1) |
| gins(a, &n2, &n1) |
| goto norm |
| |
| case gc.OMINUS: |
| regalloc(&n1, nl.Type, nil) |
| cgen(nl, &n1) |
| gc.Nodconst(&n2, nl.Type, 0) |
| gins(optoas(gc.OMINUS, nl.Type), &n2, &n1) |
| goto norm |
| |
| // symmetric binary |
| case gc.OAND, |
| gc.OOR, |
| gc.OXOR, |
| gc.OADD, |
| gc.OMUL: |
| a = optoas(int(n.Op), nl.Type) |
| |
| goto sbop |
| |
| // asymmetric binary |
| case gc.OSUB: |
| a = optoas(int(n.Op), nl.Type) |
| |
| goto abop |
| |
| case gc.OHMUL: |
| cgen_hmul(nl, nr, res) |
| |
| case gc.OLROT, |
| gc.OLSH, |
| gc.ORSH: |
| cgen_shift(int(n.Op), n.Bounded, nl, nr, res) |
| |
| case gc.OCONV: |
| if gc.Eqtype(n.Type, nl.Type) || gc.Noconv(n.Type, nl.Type) { |
| cgen(nl, res) |
| break |
| } |
| |
| var n1 gc.Node |
| if nl.Addable != 0 && !gc.Is64(nl.Type) { |
| regalloc(&n1, nl.Type, res) |
| gmove(nl, &n1) |
| } else { |
| if n.Type.Width > int64(gc.Widthptr) || gc.Is64(nl.Type) || gc.Isfloat[nl.Type.Etype] != 0 { |
| gc.Tempname(&n1, nl.Type) |
| } else { |
| regalloc(&n1, nl.Type, res) |
| } |
| cgen(nl, &n1) |
| } |
| |
| var n2 gc.Node |
| if n.Type.Width > int64(gc.Widthptr) || gc.Is64(n.Type) || gc.Isfloat[n.Type.Etype] != 0 { |
| gc.Tempname(&n2, n.Type) |
| } else { |
| regalloc(&n2, n.Type, nil) |
| } |
| gmove(&n1, &n2) |
| gmove(&n2, res) |
| if n1.Op == gc.OREGISTER { |
| regfree(&n1) |
| } |
| if n2.Op == gc.OREGISTER { |
| regfree(&n2) |
| } |
| |
| case gc.ODOT, |
| gc.ODOTPTR, |
| gc.OINDEX, |
| gc.OIND, |
| gc.ONAME: // PHEAP or PPARAMREF var |
| var n1 gc.Node |
| igen(n, &n1, res) |
| |
| gmove(&n1, res) |
| regfree(&n1) |
| |
| // interface table is first word of interface value |
| case gc.OITAB: |
| var n1 gc.Node |
| igen(nl, &n1, res) |
| |
| n1.Type = n.Type |
| gmove(&n1, res) |
| regfree(&n1) |
| |
| // pointer is the first word of string or slice. |
| case gc.OSPTR: |
| if gc.Isconst(nl, gc.CTSTR) { |
| var n1 gc.Node |
| regalloc(&n1, gc.Types[gc.Tptr], res) |
| p1 := gins(arm.AMOVW, nil, &n1) |
| gc.Datastring(nl.Val.U.Sval.S, &p1.From) |
| gmove(&n1, res) |
| regfree(&n1) |
| break |
| } |
| |
| var n1 gc.Node |
| igen(nl, &n1, res) |
| n1.Type = n.Type |
| gmove(&n1, res) |
| regfree(&n1) |
| |
| case gc.OLEN: |
| if gc.Istype(nl.Type, gc.TMAP) || gc.Istype(nl.Type, gc.TCHAN) { |
| // map has len in the first 32-bit word. |
| // a zero pointer means zero length |
| var n1 gc.Node |
| regalloc(&n1, gc.Types[gc.Tptr], res) |
| |
| cgen(nl, &n1) |
| |
| var n2 gc.Node |
| gc.Nodconst(&n2, gc.Types[gc.Tptr], 0) |
| gcmp(optoas(gc.OCMP, gc.Types[gc.Tptr]), &n1, &n2) |
| p1 := gc.Gbranch(optoas(gc.OEQ, gc.Types[gc.Tptr]), nil, -1) |
| |
| n2 = n1 |
| n2.Op = gc.OINDREG |
| n2.Type = gc.Types[gc.TINT32] |
| gmove(&n2, &n1) |
| |
| gc.Patch(p1, gc.Pc) |
| |
| gmove(&n1, res) |
| regfree(&n1) |
| break |
| } |
| |
| if gc.Istype(nl.Type, gc.TSTRING) || gc.Isslice(nl.Type) { |
| // both slice and string have len one pointer into the struct. |
| var n1 gc.Node |
| igen(nl, &n1, res) |
| |
| n1.Type = gc.Types[gc.TUINT32] |
| n1.Xoffset += int64(gc.Array_nel) |
| gmove(&n1, res) |
| regfree(&n1) |
| break |
| } |
| |
| gc.Fatal("cgen: OLEN: unknown type %v", gc.Tconv(nl.Type, obj.FmtLong)) |
| |
| case gc.OCAP: |
| if gc.Istype(nl.Type, gc.TCHAN) { |
| // chan has cap in the second 32-bit word. |
| // a zero pointer means zero length |
| var n1 gc.Node |
| regalloc(&n1, gc.Types[gc.Tptr], res) |
| |
| cgen(nl, &n1) |
| |
| var n2 gc.Node |
| gc.Nodconst(&n2, gc.Types[gc.Tptr], 0) |
| gcmp(optoas(gc.OCMP, gc.Types[gc.Tptr]), &n1, &n2) |
| p1 := gc.Gbranch(optoas(gc.OEQ, gc.Types[gc.Tptr]), nil, -1) |
| |
| n2 = n1 |
| n2.Op = gc.OINDREG |
| n2.Xoffset = 4 |
| n2.Type = gc.Types[gc.TINT32] |
| gmove(&n2, &n1) |
| |
| gc.Patch(p1, gc.Pc) |
| |
| gmove(&n1, res) |
| regfree(&n1) |
| break |
| } |
| |
| if gc.Isslice(nl.Type) { |
| var n1 gc.Node |
| igen(nl, &n1, res) |
| n1.Type = gc.Types[gc.TUINT32] |
| n1.Xoffset += int64(gc.Array_cap) |
| gmove(&n1, res) |
| regfree(&n1) |
| break |
| } |
| |
| gc.Fatal("cgen: OCAP: unknown type %v", gc.Tconv(nl.Type, obj.FmtLong)) |
| |
| case gc.OADDR: |
| agen(nl, res) |
| |
| // Release res so that it is available for cgen_call. |
| // Pick it up again after the call. |
| case gc.OCALLMETH, |
| gc.OCALLFUNC: |
| rg := -1 |
| |
| if n.Ullman >= gc.UINF { |
| if res != nil && (res.Op == gc.OREGISTER || res.Op == gc.OINDREG) { |
| rg = int(res.Val.U.Reg) |
| reg[rg]-- |
| } |
| } |
| |
| if n.Op == gc.OCALLMETH { |
| gc.Cgen_callmeth(n, 0) |
| } else { |
| cgen_call(n, 0) |
| } |
| if rg >= 0 { |
| reg[rg]++ |
| } |
| cgen_callret(n, res) |
| |
| case gc.OCALLINTER: |
| cgen_callinter(n, res, 0) |
| cgen_callret(n, res) |
| |
| case gc.OMOD, |
| gc.ODIV: |
| a = optoas(int(n.Op), nl.Type) |
| goto abop |
| } |
| |
| goto ret |
| |
| sbop: // symmetric binary |
| if nl.Ullman < nr.Ullman { |
| r := nl |
| nl = nr |
| nr = r |
| } |
| |
| // TODO(kaib): use fewer registers here. |
| abop: // asymmetric binary |
| if nl.Ullman >= nr.Ullman { |
| regalloc(&n1, nl.Type, res) |
| cgen(nl, &n1) |
| switch n.Op { |
| case gc.OADD, |
| gc.OSUB, |
| gc.OAND, |
| gc.OOR, |
| gc.OXOR: |
| if gc.Smallintconst(nr) { |
| n2 = *nr |
| break |
| } |
| fallthrough |
| |
| default: |
| regalloc(&n2, nr.Type, nil) |
| cgen(nr, &n2) |
| } |
| } else { |
| switch n.Op { |
| case gc.OADD, |
| gc.OSUB, |
| gc.OAND, |
| gc.OOR, |
| gc.OXOR: |
| if gc.Smallintconst(nr) { |
| n2 = *nr |
| break |
| } |
| fallthrough |
| |
| default: |
| regalloc(&n2, nr.Type, res) |
| cgen(nr, &n2) |
| } |
| |
| regalloc(&n1, nl.Type, nil) |
| cgen(nl, &n1) |
| } |
| |
| gins(a, &n2, &n1) |
| |
| // Normalize result for types smaller than word. |
| norm: |
| if n.Type.Width < int64(gc.Widthptr) { |
| switch n.Op { |
| case gc.OADD, |
| gc.OSUB, |
| gc.OMUL, |
| gc.OCOM, |
| gc.OMINUS: |
| gins(optoas(gc.OAS, n.Type), &n1, &n1) |
| } |
| } |
| |
| gmove(&n1, res) |
| regfree(&n1) |
| if n2.Op != gc.OLITERAL { |
| regfree(&n2) |
| } |
| goto ret |
| |
| flt: // floating-point. |
| regalloc(&f0, nl.Type, res) |
| |
| if nr != nil { |
| goto flt2 |
| } |
| |
| if n.Op == gc.OMINUS { |
| nr = gc.Nodintconst(-1) |
| gc.Convlit(&nr, n.Type) |
| n.Op = gc.OMUL |
| goto flt2 |
| } |
| |
| // unary |
| cgen(nl, &f0) |
| |
| if n.Op != gc.OCONV && n.Op != gc.OPLUS { |
| gins(optoas(int(n.Op), n.Type), &f0, &f0) |
| } |
| gmove(&f0, res) |
| regfree(&f0) |
| goto ret |
| |
| flt2: // binary |
| if nl.Ullman >= nr.Ullman { |
| cgen(nl, &f0) |
| regalloc(&f1, n.Type, nil) |
| gmove(&f0, &f1) |
| cgen(nr, &f0) |
| gins(optoas(int(n.Op), n.Type), &f0, &f1) |
| } else { |
| cgen(nr, &f0) |
| regalloc(&f1, n.Type, nil) |
| cgen(nl, &f1) |
| gins(optoas(int(n.Op), n.Type), &f0, &f1) |
| } |
| |
| gmove(&f1, res) |
| regfree(&f0) |
| regfree(&f1) |
| goto ret |
| |
| ret: |
| } |
| |
| /* |
| * generate array index into res. |
| * n might be any size; res is 32-bit. |
| * returns Prog* to patch to panic call. |
| */ |
| func cgenindex(n *gc.Node, res *gc.Node, bounded bool) *obj.Prog { |
| if !gc.Is64(n.Type) { |
| cgen(n, res) |
| return nil |
| } |
| |
| var tmp gc.Node |
| gc.Tempname(&tmp, gc.Types[gc.TINT64]) |
| cgen(n, &tmp) |
| var lo gc.Node |
| var hi gc.Node |
| split64(&tmp, &lo, &hi) |
| gmove(&lo, res) |
| if bounded { |
| splitclean() |
| return nil |
| } |
| |
| var n1 gc.Node |
| regalloc(&n1, gc.Types[gc.TINT32], nil) |
| var n2 gc.Node |
| regalloc(&n2, gc.Types[gc.TINT32], nil) |
| var zero gc.Node |
| gc.Nodconst(&zero, gc.Types[gc.TINT32], 0) |
| gmove(&hi, &n1) |
| gmove(&zero, &n2) |
| gcmp(arm.ACMP, &n1, &n2) |
| regfree(&n2) |
| regfree(&n1) |
| splitclean() |
| return gc.Gbranch(arm.ABNE, nil, -1) |
| } |
| |
| /* |
| * generate: |
| * res = &n; |
| * The generated code checks that the result is not nil. |
| */ |
| func agen(n *gc.Node, res *gc.Node) { |
| if gc.Debug['g'] != 0 { |
| gc.Dump("\nagen-res", res) |
| gc.Dump("agen-r", n) |
| } |
| |
| if n == nil || n.Type == nil || res == nil || res.Type == nil { |
| gc.Fatal("agen") |
| } |
| |
| for n.Op == gc.OCONVNOP { |
| n = n.Left |
| } |
| |
| var nl *gc.Node |
| if gc.Isconst(n, gc.CTNIL) && n.Type.Width > int64(gc.Widthptr) { |
| // Use of a nil interface or nil slice. |
| // Create a temporary we can take the address of and read. |
| // The generated code is just going to panic, so it need not |
| // be terribly efficient. See issue 3670. |
| var n1 gc.Node |
| gc.Tempname(&n1, n.Type) |
| |
| gc.Gvardef(&n1) |
| clearfat(&n1) |
| var n2 gc.Node |
| regalloc(&n2, gc.Types[gc.Tptr], res) |
| gins(arm.AMOVW, &n1, &n2) |
| gmove(&n2, res) |
| regfree(&n2) |
| goto ret |
| } |
| |
| if n.Addable != 0 { |
| n1 := gc.Node{} |
| n1.Op = gc.OADDR |
| n1.Left = n |
| var n2 gc.Node |
| regalloc(&n2, gc.Types[gc.Tptr], res) |
| gins(arm.AMOVW, &n1, &n2) |
| gmove(&n2, res) |
| regfree(&n2) |
| goto ret |
| } |
| |
| nl = n.Left |
| |
| switch n.Op { |
| default: |
| gc.Fatal("agen: unknown op %v", gc.Nconv(n, obj.FmtShort|obj.FmtSign)) |
| |
| // Release res so that it is available for cgen_call. |
| // Pick it up again after the call. |
| case gc.OCALLMETH, |
| gc.OCALLFUNC: |
| r := -1 |
| |
| if n.Ullman >= gc.UINF { |
| if res.Op == gc.OREGISTER || res.Op == gc.OINDREG { |
| r = int(res.Val.U.Reg) |
| reg[r]-- |
| } |
| } |
| |
| if n.Op == gc.OCALLMETH { |
| gc.Cgen_callmeth(n, 0) |
| } else { |
| cgen_call(n, 0) |
| } |
| if r >= 0 { |
| reg[r]++ |
| } |
| cgen_aret(n, res) |
| |
| case gc.OCALLINTER: |
| cgen_callinter(n, res, 0) |
| cgen_aret(n, res) |
| |
| case gc.OSLICE, |
| gc.OSLICEARR, |
| gc.OSLICESTR, |
| gc.OSLICE3, |
| gc.OSLICE3ARR: |
| var n1 gc.Node |
| gc.Tempname(&n1, n.Type) |
| gc.Cgen_slice(n, &n1) |
| agen(&n1, res) |
| |
| case gc.OEFACE: |
| var n1 gc.Node |
| gc.Tempname(&n1, n.Type) |
| gc.Cgen_eface(n, &n1) |
| agen(&n1, res) |
| |
| case gc.OINDEX: |
| var n1 gc.Node |
| agenr(n, &n1, res) |
| gmove(&n1, res) |
| regfree(&n1) |
| |
| // should only get here with names in this func. |
| case gc.ONAME: |
| if n.Funcdepth > 0 && n.Funcdepth != gc.Funcdepth { |
| gc.Dump("bad agen", n) |
| gc.Fatal("agen: bad ONAME funcdepth %d != %d", n.Funcdepth, gc.Funcdepth) |
| } |
| |
| // should only get here for heap vars or paramref |
| if n.Class&gc.PHEAP == 0 && n.Class != gc.PPARAMREF { |
| gc.Dump("bad agen", n) |
| gc.Fatal("agen: bad ONAME class %#x", n.Class) |
| } |
| |
| cgen(n.Heapaddr, res) |
| if n.Xoffset != 0 { |
| var n1 gc.Node |
| gc.Nodconst(&n1, gc.Types[gc.TINT32], n.Xoffset) |
| var n2 gc.Node |
| regalloc(&n2, n1.Type, nil) |
| var n3 gc.Node |
| regalloc(&n3, gc.Types[gc.TINT32], nil) |
| gmove(&n1, &n2) |
| gmove(res, &n3) |
| gins(optoas(gc.OADD, gc.Types[gc.Tptr]), &n2, &n3) |
| gmove(&n3, res) |
| regfree(&n2) |
| regfree(&n3) |
| } |
| |
| case gc.OIND: |
| cgen(nl, res) |
| gc.Cgen_checknil(res) |
| |
| case gc.ODOT: |
| agen(nl, res) |
| if n.Xoffset != 0 { |
| var n1 gc.Node |
| gc.Nodconst(&n1, gc.Types[gc.TINT32], n.Xoffset) |
| var n2 gc.Node |
| regalloc(&n2, n1.Type, nil) |
| var n3 gc.Node |
| regalloc(&n3, gc.Types[gc.TINT32], nil) |
| gmove(&n1, &n2) |
| gmove(res, &n3) |
| gins(optoas(gc.OADD, gc.Types[gc.Tptr]), &n2, &n3) |
| gmove(&n3, res) |
| regfree(&n2) |
| regfree(&n3) |
| } |
| |
| case gc.ODOTPTR: |
| cgen(nl, res) |
| gc.Cgen_checknil(res) |
| if n.Xoffset != 0 { |
| var n1 gc.Node |
| gc.Nodconst(&n1, gc.Types[gc.TINT32], n.Xoffset) |
| var n2 gc.Node |
| regalloc(&n2, n1.Type, nil) |
| var n3 gc.Node |
| regalloc(&n3, gc.Types[gc.Tptr], nil) |
| gmove(&n1, &n2) |
| gmove(res, &n3) |
| gins(optoas(gc.OADD, gc.Types[gc.Tptr]), &n2, &n3) |
| gmove(&n3, res) |
| regfree(&n2) |
| regfree(&n3) |
| } |
| } |
| |
| ret: |
| } |
| |
| /* |
| * generate: |
| * newreg = &n; |
| * res = newreg |
| * |
| * on exit, a has been changed to be *newreg. |
| * caller must regfree(a). |
| * The generated code checks that the result is not *nil. |
| */ |
| func igen(n *gc.Node, a *gc.Node, res *gc.Node) { |
| if gc.Debug['g'] != 0 { |
| gc.Dump("\nigen-n", n) |
| } |
| |
| switch n.Op { |
| case gc.ONAME: |
| if (n.Class&gc.PHEAP != 0) || n.Class == gc.PPARAMREF { |
| break |
| } |
| *a = *n |
| return |
| |
| // Increase the refcount of the register so that igen's caller |
| // has to call regfree. |
| case gc.OINDREG: |
| if n.Val.U.Reg != arm.REGSP { |
| reg[n.Val.U.Reg]++ |
| } |
| *a = *n |
| return |
| |
| case gc.ODOT: |
| igen(n.Left, a, res) |
| a.Xoffset += n.Xoffset |
| a.Type = n.Type |
| return |
| |
| case gc.ODOTPTR: |
| if n.Left.Addable != 0 || n.Left.Op == gc.OCALLFUNC || n.Left.Op == gc.OCALLMETH || n.Left.Op == gc.OCALLINTER { |
| // igen-able nodes. |
| var n1 gc.Node |
| igen(n.Left, &n1, res) |
| |
| regalloc(a, gc.Types[gc.Tptr], &n1) |
| gmove(&n1, a) |
| regfree(&n1) |
| } else { |
| regalloc(a, gc.Types[gc.Tptr], res) |
| cgen(n.Left, a) |
| } |
| |
| gc.Cgen_checknil(a) |
| a.Op = gc.OINDREG |
| a.Xoffset = n.Xoffset |
| a.Type = n.Type |
| return |
| |
| // Release res so that it is available for cgen_call. |
| // Pick it up again after the call. |
| case gc.OCALLMETH, |
| gc.OCALLFUNC, |
| gc.OCALLINTER: |
| r := -1 |
| |
| if n.Ullman >= gc.UINF { |
| if res != nil && (res.Op == gc.OREGISTER || res.Op == gc.OINDREG) { |
| r = int(res.Val.U.Reg) |
| reg[r]-- |
| } |
| } |
| |
| switch n.Op { |
| case gc.OCALLMETH: |
| gc.Cgen_callmeth(n, 0) |
| |
| case gc.OCALLFUNC: |
| cgen_call(n, 0) |
| |
| case gc.OCALLINTER: |
| cgen_callinter(n, nil, 0) |
| } |
| |
| if r >= 0 { |
| reg[r]++ |
| } |
| regalloc(a, gc.Types[gc.Tptr], res) |
| cgen_aret(n, a) |
| a.Op = gc.OINDREG |
| a.Type = n.Type |
| return |
| } |
| |
| agenr(n, a, res) |
| a.Op = gc.OINDREG |
| a.Type = n.Type |
| } |
| |
| /* |
| * allocate a register in res and generate |
| * newreg = &n |
| * The caller must call regfree(a). |
| */ |
| func cgenr(n *gc.Node, a *gc.Node, res *gc.Node) { |
| if gc.Debug['g'] != 0 { |
| gc.Dump("cgenr-n", n) |
| } |
| |
| if gc.Isfat(n.Type) { |
| gc.Fatal("cgenr on fat node") |
| } |
| |
| if n.Addable != 0 { |
| regalloc(a, gc.Types[gc.Tptr], res) |
| gmove(n, a) |
| return |
| } |
| |
| switch n.Op { |
| case gc.ONAME, |
| gc.ODOT, |
| gc.ODOTPTR, |
| gc.OINDEX, |
| gc.OCALLFUNC, |
| gc.OCALLMETH, |
| gc.OCALLINTER: |
| var n1 gc.Node |
| igen(n, &n1, res) |
| regalloc(a, gc.Types[gc.Tptr], &n1) |
| gmove(&n1, a) |
| regfree(&n1) |
| |
| default: |
| regalloc(a, n.Type, res) |
| cgen(n, a) |
| } |
| } |
| |
| /* |
| * generate: |
| * newreg = &n; |
| * |
| * caller must regfree(a). |
| * The generated code checks that the result is not nil. |
| */ |
| func agenr(n *gc.Node, a *gc.Node, res *gc.Node) { |
| if gc.Debug['g'] != 0 { |
| gc.Dump("agenr-n", n) |
| } |
| |
| nl := n.Left |
| nr := n.Right |
| |
| switch n.Op { |
| case gc.ODOT, |
| gc.ODOTPTR, |
| gc.OCALLFUNC, |
| gc.OCALLMETH, |
| gc.OCALLINTER: |
| var n1 gc.Node |
| igen(n, &n1, res) |
| regalloc(a, gc.Types[gc.Tptr], &n1) |
| agen(&n1, a) |
| regfree(&n1) |
| |
| case gc.OIND: |
| cgenr(n.Left, a, res) |
| gc.Cgen_checknil(a) |
| |
| case gc.OINDEX: |
| p2 := (*obj.Prog)(nil) // to be patched to panicindex. |
| w := uint32(n.Type.Width) |
| bounded := gc.Debug['B'] != 0 || n.Bounded |
| var n1 gc.Node |
| var n3 gc.Node |
| if nr.Addable != 0 { |
| var tmp gc.Node |
| if !gc.Isconst(nr, gc.CTINT) { |
| gc.Tempname(&tmp, gc.Types[gc.TINT32]) |
| } |
| if !gc.Isconst(nl, gc.CTSTR) { |
| agenr(nl, &n3, res) |
| } |
| if !gc.Isconst(nr, gc.CTINT) { |
| p2 = cgenindex(nr, &tmp, bounded) |
| regalloc(&n1, tmp.Type, nil) |
| gmove(&tmp, &n1) |
| } |
| } else if nl.Addable != 0 { |
| if !gc.Isconst(nr, gc.CTINT) { |
| var tmp gc.Node |
| gc.Tempname(&tmp, gc.Types[gc.TINT32]) |
| p2 = cgenindex(nr, &tmp, bounded) |
| regalloc(&n1, tmp.Type, nil) |
| gmove(&tmp, &n1) |
| } |
| |
| if !gc.Isconst(nl, gc.CTSTR) { |
| agenr(nl, &n3, res) |
| } |
| } else { |
| var tmp gc.Node |
| gc.Tempname(&tmp, gc.Types[gc.TINT32]) |
| p2 = cgenindex(nr, &tmp, bounded) |
| nr = &tmp |
| if !gc.Isconst(nl, gc.CTSTR) { |
| agenr(nl, &n3, res) |
| } |
| regalloc(&n1, tmp.Type, nil) |
| gins(optoas(gc.OAS, tmp.Type), &tmp, &n1) |
| } |
| |
| // &a is in &n3 (allocated in res) |
| // i is in &n1 (if not constant) |
| // w is width |
| |
| // constant index |
| if gc.Isconst(nr, gc.CTINT) { |
| if gc.Isconst(nl, gc.CTSTR) { |
| gc.Fatal("constant string constant index") |
| } |
| v := uint64(gc.Mpgetfix(nr.Val.U.Xval)) |
| var n2 gc.Node |
| if gc.Isslice(nl.Type) || nl.Type.Etype == gc.TSTRING { |
| if gc.Debug['B'] == 0 && !n.Bounded { |
| n1 = n3 |
| n1.Op = gc.OINDREG |
| n1.Type = gc.Types[gc.Tptr] |
| n1.Xoffset = int64(gc.Array_nel) |
| var n4 gc.Node |
| regalloc(&n4, n1.Type, nil) |
| gmove(&n1, &n4) |
| gc.Nodconst(&n2, gc.Types[gc.TUINT32], int64(v)) |
| gcmp(optoas(gc.OCMP, gc.Types[gc.TUINT32]), &n4, &n2) |
| regfree(&n4) |
| p1 := gc.Gbranch(optoas(gc.OGT, gc.Types[gc.TUINT32]), nil, +1) |
| ginscall(gc.Panicindex, 0) |
| gc.Patch(p1, gc.Pc) |
| } |
| |
| n1 = n3 |
| n1.Op = gc.OINDREG |
| n1.Type = gc.Types[gc.Tptr] |
| n1.Xoffset = int64(gc.Array_array) |
| gmove(&n1, &n3) |
| } |
| |
| gc.Nodconst(&n2, gc.Types[gc.Tptr], int64(v*uint64(w))) |
| gins(optoas(gc.OADD, gc.Types[gc.Tptr]), &n2, &n3) |
| *a = n3 |
| break |
| } |
| |
| var n2 gc.Node |
| regalloc(&n2, gc.Types[gc.TINT32], &n1) // i |
| gmove(&n1, &n2) |
| regfree(&n1) |
| |
| var n4 gc.Node |
| if gc.Debug['B'] == 0 && !n.Bounded { |
| // check bounds |
| if gc.Isconst(nl, gc.CTSTR) { |
| gc.Nodconst(&n4, gc.Types[gc.TUINT32], int64(len(nl.Val.U.Sval.S))) |
| } else if gc.Isslice(nl.Type) || nl.Type.Etype == gc.TSTRING { |
| n1 = n3 |
| n1.Op = gc.OINDREG |
| n1.Type = gc.Types[gc.Tptr] |
| n1.Xoffset = int64(gc.Array_nel) |
| regalloc(&n4, gc.Types[gc.TUINT32], nil) |
| gmove(&n1, &n4) |
| } else { |
| gc.Nodconst(&n4, gc.Types[gc.TUINT32], nl.Type.Bound) |
| } |
| |
| gcmp(optoas(gc.OCMP, gc.Types[gc.TUINT32]), &n2, &n4) |
| if n4.Op == gc.OREGISTER { |
| regfree(&n4) |
| } |
| p1 := gc.Gbranch(optoas(gc.OLT, gc.Types[gc.TUINT32]), nil, +1) |
| if p2 != nil { |
| gc.Patch(p2, gc.Pc) |
| } |
| ginscall(gc.Panicindex, 0) |
| gc.Patch(p1, gc.Pc) |
| } |
| |
| if gc.Isconst(nl, gc.CTSTR) { |
| regalloc(&n3, gc.Types[gc.Tptr], res) |
| p1 := gins(arm.AMOVW, nil, &n3) |
| gc.Datastring(nl.Val.U.Sval.S, &p1.From) |
| p1.From.Type = obj.TYPE_ADDR |
| } else if gc.Isslice(nl.Type) || nl.Type.Etype == gc.TSTRING { |
| n1 = n3 |
| n1.Op = gc.OINDREG |
| n1.Type = gc.Types[gc.Tptr] |
| n1.Xoffset = int64(gc.Array_array) |
| gmove(&n1, &n3) |
| } |
| |
| if w == 0 { |
| } else // nothing to do |
| if w == 1 || w == 2 || w == 4 || w == 8 { |
| n4 = gc.Node{} |
| n4.Op = gc.OADDR |
| n4.Left = &n2 |
| cgen(&n4, &n3) |
| if w == 1 { |
| gins(arm.AADD, &n2, &n3) |
| } else if w == 2 { |
| gshift(arm.AADD, &n2, arm.SHIFT_LL, 1, &n3) |
| } else if w == 4 { |
| gshift(arm.AADD, &n2, arm.SHIFT_LL, 2, &n3) |
| } else if w == 8 { |
| gshift(arm.AADD, &n2, arm.SHIFT_LL, 3, &n3) |
| } |
| } else { |
| regalloc(&n4, gc.Types[gc.TUINT32], nil) |
| gc.Nodconst(&n1, gc.Types[gc.TUINT32], int64(w)) |
| gmove(&n1, &n4) |
| gins(optoas(gc.OMUL, gc.Types[gc.TUINT32]), &n4, &n2) |
| gins(optoas(gc.OADD, gc.Types[gc.Tptr]), &n2, &n3) |
| regfree(&n4) |
| } |
| |
| *a = n3 |
| regfree(&n2) |
| |
| default: |
| regalloc(a, gc.Types[gc.Tptr], res) |
| agen(n, a) |
| } |
| } |
| |
| func gencmp0(n *gc.Node, t *gc.Type, o int, likely int, to *obj.Prog) { |
| var n1 gc.Node |
| |
| regalloc(&n1, t, nil) |
| cgen(n, &n1) |
| a := optoas(gc.OCMP, t) |
| if a != arm.ACMP { |
| var n2 gc.Node |
| gc.Nodconst(&n2, t, 0) |
| var n3 gc.Node |
| regalloc(&n3, t, nil) |
| gmove(&n2, &n3) |
| gcmp(a, &n1, &n3) |
| regfree(&n3) |
| } else { |
| gins(arm.ATST, &n1, nil) |
| } |
| a = optoas(o, t) |
| gc.Patch(gc.Gbranch(a, t, likely), to) |
| regfree(&n1) |
| } |
| |
| /* |
| * generate: |
| * if(n == true) goto to; |
| */ |
| func bgen(n *gc.Node, true_ bool, likely int, to *obj.Prog) { |
| if gc.Debug['g'] != 0 { |
| gc.Dump("\nbgen", n) |
| } |
| |
| if n == nil { |
| n = gc.Nodbool(true) |
| } |
| |
| if n.Ninit != nil { |
| gc.Genlist(n.Ninit) |
| } |
| |
| var et int |
| var nl *gc.Node |
| var nr *gc.Node |
| if n.Type == nil { |
| gc.Convlit(&n, gc.Types[gc.TBOOL]) |
| if n.Type == nil { |
| goto ret |
| } |
| } |
| |
| et = int(n.Type.Etype) |
| if et != gc.TBOOL { |
| gc.Yyerror("cgen: bad type %v for %v", gc.Tconv(n.Type, 0), gc.Oconv(int(n.Op), 0)) |
| gc.Patch(gins(obj.AEND, nil, nil), to) |
| goto ret |
| } |
| |
| nr = nil |
| |
| switch n.Op { |
| default: |
| a := gc.ONE |
| if !true_ { |
| a = gc.OEQ |
| } |
| gencmp0(n, n.Type, a, likely, to) |
| goto ret |
| |
| // need to ask if it is bool? |
| case gc.OLITERAL: |
| if !true_ == (n.Val.U.Bval == 0) { |
| gc.Patch(gc.Gbranch(arm.AB, nil, 0), to) |
| } |
| goto ret |
| |
| case gc.OANDAND, |
| gc.OOROR: |
| if (n.Op == gc.OANDAND) == true_ { |
| p1 := gc.Gbranch(obj.AJMP, nil, 0) |
| p2 := gc.Gbranch(obj.AJMP, nil, 0) |
| gc.Patch(p1, gc.Pc) |
| bgen(n.Left, !true_, -likely, p2) |
| bgen(n.Right, !true_, -likely, p2) |
| p1 = gc.Gbranch(obj.AJMP, nil, 0) |
| gc.Patch(p1, to) |
| gc.Patch(p2, gc.Pc) |
| } else { |
| bgen(n.Left, true_, likely, to) |
| bgen(n.Right, true_, likely, to) |
| } |
| |
| goto ret |
| |
| case gc.OEQ, |
| gc.ONE, |
| gc.OLT, |
| gc.OGT, |
| gc.OLE, |
| gc.OGE: |
| nr = n.Right |
| if nr == nil || nr.Type == nil { |
| goto ret |
| } |
| fallthrough |
| |
| case gc.ONOT: // unary |
| nl = n.Left |
| |
| if nl == nil || nl.Type == nil { |
| goto ret |
| } |
| } |
| |
| switch n.Op { |
| case gc.ONOT: |
| bgen(nl, !true_, likely, to) |
| goto ret |
| |
| case gc.OEQ, |
| gc.ONE, |
| gc.OLT, |
| gc.OGT, |
| gc.OLE, |
| gc.OGE: |
| a := int(n.Op) |
| if !true_ { |
| if gc.Isfloat[nl.Type.Etype] != 0 { |
| // brcom is not valid on floats when NaN is involved. |
| p1 := gc.Gbranch(arm.AB, nil, 0) |
| |
| p2 := gc.Gbranch(arm.AB, nil, 0) |
| gc.Patch(p1, gc.Pc) |
| ll := n.Ninit |
| n.Ninit = nil |
| bgen(n, true, -likely, p2) |
| n.Ninit = ll |
| gc.Patch(gc.Gbranch(arm.AB, nil, 0), to) |
| gc.Patch(p2, gc.Pc) |
| goto ret |
| } |
| |
| a = gc.Brcom(a) |
| true_ = !true_ |
| } |
| |
| // make simplest on right |
| if nl.Op == gc.OLITERAL || (nl.Ullman < gc.UINF && nl.Ullman < nr.Ullman) { |
| a = gc.Brrev(a) |
| r := nl |
| nl = nr |
| nr = r |
| } |
| |
| if gc.Isslice(nl.Type) { |
| // only valid to cmp darray to literal nil |
| if (a != gc.OEQ && a != gc.ONE) || nr.Op != gc.OLITERAL { |
| gc.Yyerror("illegal array comparison") |
| break |
| } |
| |
| var n1 gc.Node |
| igen(nl, &n1, nil) |
| n1.Xoffset += int64(gc.Array_array) |
| n1.Type = gc.Types[gc.Tptr] |
| gencmp0(&n1, gc.Types[gc.Tptr], a, likely, to) |
| regfree(&n1) |
| break |
| } |
| |
| if gc.Isinter(nl.Type) { |
| // front end shold only leave cmp to literal nil |
| if (a != gc.OEQ && a != gc.ONE) || nr.Op != gc.OLITERAL { |
| gc.Yyerror("illegal interface comparison") |
| break |
| } |
| |
| var n1 gc.Node |
| igen(nl, &n1, nil) |
| n1.Type = gc.Types[gc.Tptr] |
| n1.Xoffset += 0 |
| gencmp0(&n1, gc.Types[gc.Tptr], a, likely, to) |
| regfree(&n1) |
| break |
| } |
| |
| if gc.Iscomplex[nl.Type.Etype] != 0 { |
| gc.Complexbool(a, nl, nr, true_, likely, to) |
| break |
| } |
| |
| if gc.Is64(nr.Type) { |
| if nl.Addable == 0 { |
| var n1 gc.Node |
| gc.Tempname(&n1, nl.Type) |
| cgen(nl, &n1) |
| nl = &n1 |
| } |
| |
| if nr.Addable == 0 { |
| var n2 gc.Node |
| gc.Tempname(&n2, nr.Type) |
| cgen(nr, &n2) |
| nr = &n2 |
| } |
| |
| cmp64(nl, nr, a, likely, to) |
| break |
| } |
| |
| if nr.Op == gc.OLITERAL { |
| if gc.Isconst(nr, gc.CTINT) && gc.Mpgetfix(nr.Val.U.Xval) == 0 { |
| gencmp0(nl, nl.Type, a, likely, to) |
| break |
| } |
| |
| if nr.Val.Ctype == gc.CTNIL { |
| gencmp0(nl, nl.Type, a, likely, to) |
| break |
| } |
| } |
| |
| a = optoas(a, nr.Type) |
| |
| if nr.Ullman >= gc.UINF { |
| var n1 gc.Node |
| regalloc(&n1, nl.Type, nil) |
| cgen(nl, &n1) |
| |
| var tmp gc.Node |
| gc.Tempname(&tmp, nl.Type) |
| gmove(&n1, &tmp) |
| regfree(&n1) |
| |
| var n2 gc.Node |
| regalloc(&n2, nr.Type, nil) |
| cgen(nr, &n2) |
| |
| regalloc(&n1, nl.Type, nil) |
| cgen(&tmp, &n1) |
| |
| gcmp(optoas(gc.OCMP, nr.Type), &n1, &n2) |
| gc.Patch(gc.Gbranch(a, nr.Type, likely), to) |
| |
| regfree(&n1) |
| regfree(&n2) |
| break |
| } |
| |
| var n3 gc.Node |
| gc.Tempname(&n3, nl.Type) |
| cgen(nl, &n3) |
| |
| var tmp gc.Node |
| gc.Tempname(&tmp, nr.Type) |
| cgen(nr, &tmp) |
| |
| var n1 gc.Node |
| regalloc(&n1, nl.Type, nil) |
| gmove(&n3, &n1) |
| |
| var n2 gc.Node |
| regalloc(&n2, nr.Type, nil) |
| gmove(&tmp, &n2) |
| |
| gcmp(optoas(gc.OCMP, nr.Type), &n1, &n2) |
| if gc.Isfloat[nl.Type.Etype] != 0 { |
| if n.Op == gc.ONE { |
| p1 := gc.Gbranch(arm.ABVS, nr.Type, likely) |
| gc.Patch(gc.Gbranch(a, nr.Type, likely), to) |
| gc.Patch(p1, to) |
| } else { |
| p1 := gc.Gbranch(arm.ABVS, nr.Type, -likely) |
| gc.Patch(gc.Gbranch(a, nr.Type, likely), to) |
| gc.Patch(p1, gc.Pc) |
| } |
| } else { |
| gc.Patch(gc.Gbranch(a, nr.Type, likely), to) |
| } |
| |
| regfree(&n1) |
| regfree(&n2) |
| } |
| |
| goto ret |
| |
| ret: |
| } |
| |
| /* |
| * n is on stack, either local variable |
| * or return value from function call. |
| * return n's offset from SP. |
| */ |
| func stkof(n *gc.Node) int32 { |
| switch n.Op { |
| case gc.OINDREG: |
| return int32(n.Xoffset) |
| |
| case gc.ODOT: |
| t := n.Left.Type |
| if gc.Isptr[t.Etype] != 0 { |
| break |
| } |
| off := stkof(n.Left) |
| if off == -1000 || off == 1000 { |
| return off |
| } |
| return int32(int64(off) + n.Xoffset) |
| |
| case gc.OINDEX: |
| t := n.Left.Type |
| if !gc.Isfixedarray(t) { |
| break |
| } |
| off := stkof(n.Left) |
| if off == -1000 || off == 1000 { |
| return off |
| } |
| if gc.Isconst(n.Right, gc.CTINT) { |
| return int32(int64(off) + t.Type.Width*gc.Mpgetfix(n.Right.Val.U.Xval)) |
| } |
| return 1000 |
| |
| case gc.OCALLMETH, |
| gc.OCALLINTER, |
| gc.OCALLFUNC: |
| t := n.Left.Type |
| if gc.Isptr[t.Etype] != 0 { |
| t = t.Type |
| } |
| |
| var flist gc.Iter |
| t = gc.Structfirst(&flist, gc.Getoutarg(t)) |
| if t != nil { |
| return int32(t.Width + 4) // correct for LR |
| } |
| } |
| |
| // botch - probably failing to recognize address |
| // arithmetic on the above. eg INDEX and DOT |
| return -1000 |
| } |
| |
| /* |
| * block copy: |
| * memmove(&res, &n, w); |
| * NB: character copy assumed little endian architecture |
| */ |
| func sgen(n *gc.Node, res *gc.Node, w int64) { |
| if gc.Debug['g'] != 0 { |
| fmt.Printf("\nsgen w=%d\n", w) |
| gc.Dump("r", n) |
| gc.Dump("res", res) |
| } |
| |
| if n.Ullman >= gc.UINF && res.Ullman >= gc.UINF { |
| gc.Fatal("sgen UINF") |
| } |
| |
| if w < 0 || int64(int32(w)) != w { |
| gc.Fatal("sgen copy %d", w) |
| } |
| |
| if n.Type == nil { |
| gc.Fatal("sgen: missing type") |
| } |
| |
| if w == 0 { |
| // evaluate side effects only. |
| var dst gc.Node |
| regalloc(&dst, gc.Types[gc.Tptr], nil) |
| |
| agen(res, &dst) |
| agen(n, &dst) |
| regfree(&dst) |
| return |
| } |
| |
| // If copying .args, that's all the results, so record definition sites |
| // for them for the liveness analysis. |
| if res.Op == gc.ONAME && res.Sym.Name == ".args" { |
| for l := gc.Curfn.Dcl; l != nil; l = l.Next { |
| if l.N.Class == gc.PPARAMOUT { |
| gc.Gvardef(l.N) |
| } |
| } |
| } |
| |
| // Avoid taking the address for simple enough types. |
| if componentgen(n, res) { |
| return |
| } |
| |
| // determine alignment. |
| // want to avoid unaligned access, so have to use |
| // smaller operations for less aligned types. |
| // for example moving [4]byte must use 4 MOVB not 1 MOVW. |
| align := int(n.Type.Align) |
| |
| var op int |
| switch align { |
| default: |
| gc.Fatal("sgen: invalid alignment %d for %v", align, gc.Tconv(n.Type, 0)) |
| |
| case 1: |
| op = arm.AMOVB |
| |
| case 2: |
| op = arm.AMOVH |
| |
| case 4: |
| op = arm.AMOVW |
| } |
| |
| if w%int64(align) != 0 { |
| gc.Fatal("sgen: unaligned size %d (align=%d) for %v", w, align, gc.Tconv(n.Type, 0)) |
| } |
| c := int32(w / int64(align)) |
| |
| // offset on the stack |
| osrc := stkof(n) |
| |
| odst := stkof(res) |
| if osrc != -1000 && odst != -1000 && (osrc == 1000 || odst == 1000) { |
| // osrc and odst both on stack, and at least one is in |
| // an unknown position. Could generate code to test |
| // for forward/backward copy, but instead just copy |
| // to a temporary location first. |
| var tmp gc.Node |
| gc.Tempname(&tmp, n.Type) |
| |
| sgen(n, &tmp, w) |
| sgen(&tmp, res, w) |
| return |
| } |
| |
| if osrc%int32(align) != 0 || odst%int32(align) != 0 { |
| gc.Fatal("sgen: unaligned offset src %d or dst %d (align %d)", osrc, odst, align) |
| } |
| |
| // if we are copying forward on the stack and |
| // the src and dst overlap, then reverse direction |
| dir := align |
| |
| if osrc < odst && int64(odst) < int64(osrc)+w { |
| dir = -dir |
| } |
| |
| if op == arm.AMOVW && !gc.Nacl && dir > 0 && c >= 4 && c <= 128 { |
| var r0 gc.Node |
| r0.Op = gc.OREGISTER |
| r0.Val.U.Reg = REGALLOC_R0 |
| var r1 gc.Node |
| r1.Op = gc.OREGISTER |
| r1.Val.U.Reg = REGALLOC_R0 + 1 |
| var r2 gc.Node |
| r2.Op = gc.OREGISTER |
| r2.Val.U.Reg = REGALLOC_R0 + 2 |
| |
| var src gc.Node |
| regalloc(&src, gc.Types[gc.Tptr], &r1) |
| var dst gc.Node |
| regalloc(&dst, gc.Types[gc.Tptr], &r2) |
| if n.Ullman >= res.Ullman { |
| // eval n first |
| agen(n, &src) |
| |
| if res.Op == gc.ONAME { |
| gc.Gvardef(res) |
| } |
| agen(res, &dst) |
| } else { |
| // eval res first |
| if res.Op == gc.ONAME { |
| gc.Gvardef(res) |
| } |
| agen(res, &dst) |
| agen(n, &src) |
| } |
| |
| var tmp gc.Node |
| regalloc(&tmp, gc.Types[gc.Tptr], &r0) |
| f := gc.Sysfunc("duffcopy") |
| p := gins(obj.ADUFFCOPY, nil, f) |
| gc.Afunclit(&p.To, f) |
| |
| // 8 and 128 = magic constants: see ../../runtime/asm_arm.s |
| p.To.Offset = 8 * (128 - int64(c)) |
| |
| regfree(&tmp) |
| regfree(&src) |
| regfree(&dst) |
| return |
| } |
| |
| var dst gc.Node |
| var src gc.Node |
| if n.Ullman >= res.Ullman { |
| agenr(n, &dst, res) // temporarily use dst |
| regalloc(&src, gc.Types[gc.Tptr], nil) |
| gins(arm.AMOVW, &dst, &src) |
| if res.Op == gc.ONAME { |
| gc.Gvardef(res) |
| } |
| agen(res, &dst) |
| } else { |
| if res.Op == gc.ONAME { |
| gc.Gvardef(res) |
| } |
| agenr(res, &dst, res) |
| agenr(n, &src, nil) |
| } |
| |
| var tmp gc.Node |
| regalloc(&tmp, gc.Types[gc.TUINT32], nil) |
| |
| // set up end marker |
| nend := gc.Node{} |
| |
| if c >= 4 { |
| regalloc(&nend, gc.Types[gc.TUINT32], nil) |
| |
| p := gins(arm.AMOVW, &src, &nend) |
| p.From.Type = obj.TYPE_ADDR |
| if dir < 0 { |
| p.From.Offset = int64(dir) |
| } else { |
| p.From.Offset = w |
| } |
| } |
| |
| // move src and dest to the end of block if necessary |
| if dir < 0 { |
| p := gins(arm.AMOVW, &src, &src) |
| p.From.Type = obj.TYPE_ADDR |
| p.From.Offset = w + int64(dir) |
| |
| p = gins(arm.AMOVW, &dst, &dst) |
| p.From.Type = obj.TYPE_ADDR |
| p.From.Offset = w + int64(dir) |
| } |
| |
| // move |
| if c >= 4 { |
| p := gins(op, &src, &tmp) |
| p.From.Type = obj.TYPE_MEM |
| p.From.Offset = int64(dir) |
| p.Scond |= arm.C_PBIT |
| ploop := p |
| |
| p = gins(op, &tmp, &dst) |
| p.To.Type = obj.TYPE_MEM |
| p.To.Offset = int64(dir) |
| p.Scond |= arm.C_PBIT |
| |
| p = gins(arm.ACMP, &src, nil) |
| raddr(&nend, p) |
| |
| gc.Patch(gc.Gbranch(arm.ABNE, nil, 0), ploop) |
| regfree(&nend) |
| } else { |
| var p *obj.Prog |
| for { |
| tmp14 := c |
| c-- |
| if tmp14 <= 0 { |
| break |
| } |
| p = gins(op, &src, &tmp) |
| p.From.Type = obj.TYPE_MEM |
| p.From.Offset = int64(dir) |
| p.Scond |= arm.C_PBIT |
| |
| p = gins(op, &tmp, &dst) |
| p.To.Type = obj.TYPE_MEM |
| p.To.Offset = int64(dir) |
| p.Scond |= arm.C_PBIT |
| } |
| } |
| |
| regfree(&dst) |
| regfree(&src) |
| regfree(&tmp) |
| } |
| |
| func cadable(n *gc.Node) bool { |
| if n.Addable == 0 { |
| // dont know how it happens, |
| // but it does |
| return false |
| } |
| |
| switch n.Op { |
| case gc.ONAME: |
| return true |
| } |
| |
| return false |
| } |
| |
| /* |
| * copy a composite value by moving its individual components. |
| * Slices, strings and interfaces are supported. |
| * Small structs or arrays with elements of basic type are |
| * also supported. |
| * nr is N when assigning a zero value. |
| * return 1 if can do, 0 if cant. |
| */ |
| func componentgen(nr *gc.Node, nl *gc.Node) bool { |
| var nodl gc.Node |
| var nodr gc.Node |
| |
| freel := 0 |
| freer := 0 |
| |
| switch nl.Type.Etype { |
| default: |
| goto no |
| |
| case gc.TARRAY: |
| t := nl.Type |
| |
| // Slices are ok. |
| if gc.Isslice(t) { |
| break |
| } |
| |
| // Small arrays are ok. |
| if t.Bound > 0 && t.Bound <= 3 && !gc.Isfat(t.Type) { |
| break |
| } |
| |
| goto no |
| |
| // Small structs with non-fat types are ok. |
| // Zero-sized structs are treated separately elsewhere. |
| case gc.TSTRUCT: |
| fldcount := int64(0) |
| |
| for t := nl.Type.Type; t != nil; t = t.Down { |
| if gc.Isfat(t.Type) { |
| goto no |
| } |
| if t.Etype != gc.TFIELD { |
| gc.Fatal("componentgen: not a TFIELD: %v", gc.Tconv(t, obj.FmtLong)) |
| } |
| fldcount++ |
| } |
| |
| if fldcount == 0 || fldcount > 4 { |
| goto no |
| } |
| |
| case gc.TSTRING, |
| gc.TINTER: |
| break |
| } |
| |
| nodl = *nl |
| if !cadable(nl) { |
| if nr != nil && !cadable(nr) { |
| goto no |
| } |
| igen(nl, &nodl, nil) |
| freel = 1 |
| } |
| |
| if nr != nil { |
| nodr = *nr |
| if !cadable(nr) { |
| igen(nr, &nodr, nil) |
| freer = 1 |
| } |
| } else { |
| // When zeroing, prepare a register containing zero. |
| var tmp gc.Node |
| gc.Nodconst(&tmp, nl.Type, 0) |
| |
| regalloc(&nodr, gc.Types[gc.TUINT], nil) |
| gmove(&tmp, &nodr) |
| freer = 1 |
| } |
| |
| // nl and nr are 'cadable' which basically means they are names (variables) now. |
| // If they are the same variable, don't generate any code, because the |
| // VARDEF we generate will mark the old value as dead incorrectly. |
| // (And also the assignments are useless.) |
| if nr != nil && nl.Op == gc.ONAME && nr.Op == gc.ONAME && nl == nr { |
| goto yes |
| } |
| |
| switch nl.Type.Etype { |
| // componentgen for arrays. |
| case gc.TARRAY: |
| if nl.Op == gc.ONAME { |
| gc.Gvardef(nl) |
| } |
| t := nl.Type |
| if !gc.Isslice(t) { |
| nodl.Type = t.Type |
| nodr.Type = nodl.Type |
| for fldcount := int64(0); fldcount < t.Bound; fldcount++ { |
| if nr == nil { |
| gc.Clearslim(&nodl) |
| } else { |
| gmove(&nodr, &nodl) |
| } |
| nodl.Xoffset += t.Type.Width |
| nodr.Xoffset += t.Type.Width |
| } |
| |
| goto yes |
| } |
| |
| // componentgen for slices. |
| nodl.Xoffset += int64(gc.Array_array) |
| |
| nodl.Type = gc.Ptrto(nl.Type.Type) |
| |
| if nr != nil { |
| nodr.Xoffset += int64(gc.Array_array) |
| nodr.Type = nodl.Type |
| } |
| |
| gmove(&nodr, &nodl) |
| |
| nodl.Xoffset += int64(gc.Array_nel) - int64(gc.Array_array) |
| nodl.Type = gc.Types[gc.Simtype[gc.TUINT]] |
| |
| if nr != nil { |
| nodr.Xoffset += int64(gc.Array_nel) - int64(gc.Array_array) |
| nodr.Type = nodl.Type |
| } |
| |
| gmove(&nodr, &nodl) |
| |
| nodl.Xoffset += int64(gc.Array_cap) - int64(gc.Array_nel) |
| nodl.Type = gc.Types[gc.Simtype[gc.TUINT]] |
| |
| if nr != nil { |
| nodr.Xoffset += int64(gc.Array_cap) - int64(gc.Array_nel) |
| nodr.Type = nodl.Type |
| } |
| |
| gmove(&nodr, &nodl) |
| |
| goto yes |
| |
| case gc.TSTRING: |
| if nl.Op == gc.ONAME { |
| gc.Gvardef(nl) |
| } |
| nodl.Xoffset += int64(gc.Array_array) |
| nodl.Type = gc.Ptrto(gc.Types[gc.TUINT8]) |
| |
| if nr != nil { |
| nodr.Xoffset += int64(gc.Array_array) |
| nodr.Type = nodl.Type |
| } |
| |
| gmove(&nodr, &nodl) |
| |
| nodl.Xoffset += int64(gc.Array_nel) - int64(gc.Array_array) |
| nodl.Type = gc.Types[gc.Simtype[gc.TUINT]] |
| |
| if nr != nil { |
| nodr.Xoffset += int64(gc.Array_nel) - int64(gc.Array_array) |
| nodr.Type = nodl.Type |
| } |
| |
| gmove(&nodr, &nodl) |
| |
| goto yes |
| |
| case gc.TINTER: |
| if nl.Op == gc.ONAME { |
| gc.Gvardef(nl) |
| } |
| nodl.Xoffset += int64(gc.Array_array) |
| nodl.Type = gc.Ptrto(gc.Types[gc.TUINT8]) |
| |
| if nr != nil { |
| nodr.Xoffset += int64(gc.Array_array) |
| nodr.Type = nodl.Type |
| } |
| |
| gmove(&nodr, &nodl) |
| |
| nodl.Xoffset += int64(gc.Array_nel) - int64(gc.Array_array) |
| nodl.Type = gc.Ptrto(gc.Types[gc.TUINT8]) |
| |
| if nr != nil { |
| nodr.Xoffset += int64(gc.Array_nel) - int64(gc.Array_array) |
| nodr.Type = nodl.Type |
| } |
| |
| gmove(&nodr, &nodl) |
| |
| goto yes |
| |
| case gc.TSTRUCT: |
| if nl.Op == gc.ONAME { |
| gc.Gvardef(nl) |
| } |
| loffset := nodl.Xoffset |
| roffset := nodr.Xoffset |
| |
| // funarg structs may not begin at offset zero. |
| if nl.Type.Etype == gc.TSTRUCT && nl.Type.Funarg != 0 && nl.Type.Type != nil { |
| loffset -= nl.Type.Type.Width |
| } |
| if nr != nil && nr.Type.Etype == gc.TSTRUCT && nr.Type.Funarg != 0 && nr.Type.Type != nil { |
| roffset -= nr.Type.Type.Width |
| } |
| |
| for t := nl.Type.Type; t != nil; t = t.Down { |
| nodl.Xoffset = loffset + t.Width |
| nodl.Type = t.Type |
| |
| if nr == nil { |
| gc.Clearslim(&nodl) |
| } else { |
| nodr.Xoffset = roffset + t.Width |
| nodr.Type = nodl.Type |
| gmove(&nodr, &nodl) |
| } |
| } |
| |
| goto yes |
| } |
| |
| no: |
| if freer != 0 { |
| regfree(&nodr) |
| } |
| if freel != 0 { |
| regfree(&nodl) |
| } |
| return false |
| |
| yes: |
| if freer != 0 { |
| regfree(&nodr) |
| } |
| if freel != 0 { |
| regfree(&nodl) |
| } |
| return true |
| } |
