Golang obj.Link類代碼示例

本文整理匯總了Golang中cmd/internal/obj.Link類的典型用法代碼示例。如果您正苦於以下問題：Golang Link類的具體用法？Golang Link怎麽用？Golang Link使用的例子？那麽, 這裏精選的類代碼示例或許可以為您提供幫助。

在下文中一共展示了Link類的15個代碼示例，這些例子默認根據受歡迎程度排序。您可以為喜歡或者感覺有用的代碼點讚，您的評價將有助於係統推薦出更棒的Golang代碼示例。

示例1: nacladdr

func nacladdr(ctxt *obj.Link, p *obj.Prog, a *obj.Addr) {
	if p.As == ALEAL || p.As == ALEAQ {
		return
	}

	if a.Reg == REG_BP {
		ctxt.Diag("invalid address: %v", p)
		return
	}

	if a.Reg == REG_TLS {
		a.Reg = REG_BP
	}
	if a.Type == obj.TYPE_MEM && a.Name == obj.NAME_NONE {
		switch a.Reg {
		// all ok
		case REG_BP, REG_SP, REG_R15:
			break

		default:
			if a.Index != REG_NONE {
				ctxt.Diag("invalid address %v", p)
			}
			a.Index = a.Reg
			if a.Index != REG_NONE {
				a.Scale = 1
			}
			a.Reg = REG_R15
		}
	}
}

開發者ID:duhaibo0404，項目名稱:go-1，代碼行數:31，代碼來源:obj6.go

示例2: follow

func follow(ctxt *obj.Link, s *obj.LSym) {
	ctxt.Cursym = s

	firstp := ctxt.NewProg()
	lastp := firstp
	xfol(ctxt, s.Text, &lastp)
	lastp.Link = nil
	s.Text = firstp.Link
}

開發者ID:arnold8，項目名稱:go，代碼行數:9，代碼來源:obj5.go

示例3: initdiv

func initdiv(ctxt *obj.Link) {
	if ctxt.Sym_div != nil {
		return
	}
	ctxt.Sym_div = obj.Linklookup(ctxt, "_div", 0)
	ctxt.Sym_divu = obj.Linklookup(ctxt, "_divu", 0)
	ctxt.Sym_mod = obj.Linklookup(ctxt, "_mod", 0)
	ctxt.Sym_modu = obj.Linklookup(ctxt, "_modu", 0)
}

開發者ID:arnold8，項目名稱:go，代碼行數:9，代碼來源:obj5.go

示例4: oplook

func oplook(ctxt *obj.Link, p *obj.Prog) *Optab {
	if oprange[AOR&obj.AMask].start == nil {
		buildop(ctxt)
	}

	a1 := int(p.Optab)
	if a1 != 0 {
		return &optab[a1-1:][0]
	}
	a1 = int(p.From.Class)
	if a1 == 0 {
		a1 = aclass(ctxt, &p.From) + 1
		p.From.Class = int8(a1)
	}

	a1--
	a3 := int(p.To.Class)
	if a3 == 0 {
		a3 = aclass(ctxt, &p.To) + 1
		p.To.Class = int8(a3)
	}

	a3--
	a2 := C_NONE
	if p.Reg != 0 {
		a2 = C_REG
	}

	//print("oplook %P %d %d %d\n", p, a1, a2, a3);
	r0 := p.As & obj.AMask

	o := oprange[r0].start
	if o == nil {
		o = oprange[r0].stop /* just generate an error */
	}
	e := oprange[r0].stop
	c1 := xcmp[a1][:]
	c3 := xcmp[a3][:]
	for ; -cap(o) < -cap(e); o = o[1:] {
		if int(o[0].a2) == a2 {
			if c1[o[0].a1] != 0 {
				if c3[o[0].a3] != 0 {
					p.Optab = uint16((-cap(o) + cap(optab)) + 1)
					return &o[0]
				}
			}
		}
	}

	ctxt.Diag("illegal combination %v %v %v %v", obj.Aconv(int(p.As)), DRconv(a1), DRconv(a2), DRconv(a3))
	prasm(p)
	if o == nil {
		o = optab
	}
	return &o[0]
}

開發者ID:danny8002，項目名稱:go，代碼行數:56，代碼來源:asm0.go

示例5: addnop

func addnop(ctxt *obj.Link, p *obj.Prog) {
	q := ctxt.NewProg()
	// we want to use the canonical NOP (SLL $0,R0,R0) here,
	// however, as the assembler will always replace $0
	// as R0, we have to resort to manually encode the SLL
	// instruction as WORD $0.
	q.As = AWORD
	q.Lineno = p.Lineno
	q.From.Type = obj.TYPE_CONST
	q.From.Name = obj.NAME_NONE
	q.From.Offset = 0

	q.Link = p.Link
	p.Link = q
}

開發者ID:Harvey-OS，項目名稱:go，代碼行數:15，代碼來源:obj0.go

示例6: oplook

func oplook(ctxt *obj.Link, p *obj.Prog) *Optab {
	if oprange[AOR&obj.AMask] == nil {
		buildop(ctxt)
	}

	a1 := int(p.Optab)
	if a1 != 0 {
		return &optab[a1-1]
	}
	a1 = int(p.From.Class)
	if a1 == 0 {
		a1 = aclass(ctxt, &p.From) + 1
		p.From.Class = int8(a1)
	}

	a1--
	a3 := int(p.To.Class)
	if a3 == 0 {
		a3 = aclass(ctxt, &p.To) + 1
		p.To.Class = int8(a3)
	}

	a3--
	a2 := C_NONE
	if p.Reg != 0 {
		a2 = C_REG
	}

	//print("oplook %P %d %d %d\n", p, a1, a2, a3);

	ops := oprange[p.As&obj.AMask]
	c1 := &xcmp[a1]
	c3 := &xcmp[a3]
	for i := range ops {
		op := &ops[i]
		if int(op.a2) == a2 && c1[op.a1] && c3[op.a3] {
			p.Optab = uint16(cap(optab) - cap(ops) + i + 1)
			return op
		}
	}

	ctxt.Diag("illegal combination %v %v %v %v", obj.Aconv(p.As), DRconv(a1), DRconv(a2), DRconv(a3))
	prasm(p)
	if ops == nil {
		ops = optab
	}
	return &ops[0]
}

開發者ID:2thetop，項目名稱:go，代碼行數:48，代碼來源:asm0.go

示例7: preprocess

func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
	if ctxt.Headtype == obj.Hplan9 && ctxt.Plan9privates == nil {
		ctxt.Plan9privates = obj.Linklookup(ctxt, "_privates", 0)
	}

	ctxt.Cursym = cursym

	if cursym.Text == nil || cursym.Text.Link == nil {
		return
	}

	p := cursym.Text
	autoffset := int32(p.To.Offset)
	if autoffset < 0 {
		autoffset = 0
	}

	var bpsize int
	if p.Mode == 64 && ctxt.Framepointer_enabled && autoffset > 0 && p.From3.Offset&obj.NOFRAME == 0 {
		// Make room for to save a base pointer. If autoffset == 0,
		// this might do something special like a tail jump to
		// another function, so in that case we omit this.
		bpsize = ctxt.Arch.PtrSize
		autoffset += int32(bpsize)
		p.To.Offset += int64(bpsize)
	} else {
		bpsize = 0
	}

	textarg := int64(p.To.Val.(int32))
	cursym.Args = int32(textarg)
	cursym.Locals = int32(p.To.Offset)

	// TODO(rsc): Remove.
	if p.Mode == 32 && cursym.Locals < 0 {
		cursym.Locals = 0
	}

	// TODO(rsc): Remove 'p.Mode == 64 &&'.
	if p.Mode == 64 && autoffset < obj.StackSmall && p.From3Offset()&obj.NOSPLIT == 0 {
		leaf := true
	LeafSearch:
		for q := p; q != nil; q = q.Link {
			switch q.As {
			case obj.ACALL:
				// Treat common runtime calls that take no arguments
				// the same as duffcopy and duffzero.
				if !isZeroArgRuntimeCall(q.To.Sym) {
					leaf = false
					break LeafSearch
				}
				fallthrough
			case obj.ADUFFCOPY, obj.ADUFFZERO:
				if autoffset >= obj.StackSmall-8 {
					leaf = false
					break LeafSearch
				}
			}
		}

		if leaf {
			p.From3.Offset |= obj.NOSPLIT
		}
	}

	if p.From3Offset()&obj.NOSPLIT == 0 || p.From3Offset()&obj.WRAPPER != 0 {
		p = obj.Appendp(ctxt, p)
		p = load_g_cx(ctxt, p) // load g into CX
	}

	if cursym.Text.From3Offset()&obj.NOSPLIT == 0 {
		p = stacksplit(ctxt, p, autoffset, int32(textarg)) // emit split check
	}

	if autoffset != 0 {
		if autoffset%int32(ctxt.Arch.RegSize) != 0 {
			ctxt.Diag("unaligned stack size %d", autoffset)
		}
		p = obj.Appendp(ctxt, p)
		p.As = AADJSP
		p.From.Type = obj.TYPE_CONST
		p.From.Offset = int64(autoffset)
		p.Spadj = autoffset
	}

	deltasp := autoffset

	if bpsize > 0 {
		// Save caller's BP
		p = obj.Appendp(ctxt, p)

		p.As = AMOVQ
		p.From.Type = obj.TYPE_REG
		p.From.Reg = REG_BP
		p.To.Type = obj.TYPE_MEM
		p.To.Reg = REG_SP
		p.To.Scale = 1
		p.To.Offset = int64(autoffset) - int64(bpsize)

		// Move current frame to BP
//.........這裏部分代碼省略.........

開發者ID:achanda，項目名稱:go，代碼行數:101，代碼來源:obj6.go

示例8: rewriteToUseGot

// Rewrite p, if necessary, to access global data via the global offset table.
func rewriteToUseGot(ctxt *obj.Link, p *obj.Prog) {
	var add, lea, mov obj.As
	var reg int16
	if p.Mode == 64 {
		add = AADDQ
		lea = ALEAQ
		mov = AMOVQ
		reg = REG_R15
	} else {
		add = AADDL
		lea = ALEAL
		mov = AMOVL
		reg = REG_CX
	}

	if p.As == obj.ADUFFCOPY || p.As == obj.ADUFFZERO {
		//     ADUFFxxx $offset
		// becomes
		//     $MOV [email protected], $reg
		//     $ADD $offset, $reg
		//     CALL $reg
		var sym *obj.LSym
		if p.As == obj.ADUFFZERO {
			sym = obj.Linklookup(ctxt, "runtime.duffzero", 0)
		} else {
			sym = obj.Linklookup(ctxt, "runtime.duffcopy", 0)
		}
		offset := p.To.Offset
		p.As = mov
		p.From.Type = obj.TYPE_MEM
		p.From.Name = obj.NAME_GOTREF
		p.From.Sym = sym
		p.To.Type = obj.TYPE_REG
		p.To.Reg = reg
		p.To.Offset = 0
		p.To.Sym = nil
		p1 := obj.Appendp(ctxt, p)
		p1.As = add
		p1.From.Type = obj.TYPE_CONST
		p1.From.Offset = offset
		p1.To.Type = obj.TYPE_REG
		p1.To.Reg = reg
		p2 := obj.Appendp(ctxt, p1)
		p2.As = obj.ACALL
		p2.To.Type = obj.TYPE_REG
		p2.To.Reg = reg
	}

	// We only care about global data: NAME_EXTERN means a global
	// symbol in the Go sense, and p.Sym.Local is true for a few
	// internally defined symbols.
	if p.As == lea && p.From.Type == obj.TYPE_MEM && p.From.Name == obj.NAME_EXTERN && !p.From.Sym.Local {
		// $LEA sym, Rx becomes $MOV $sym, Rx which will be rewritten below
		p.As = mov
		p.From.Type = obj.TYPE_ADDR
	}
	if p.From.Type == obj.TYPE_ADDR && p.From.Name == obj.NAME_EXTERN && !p.From.Sym.Local {
		// $MOV $sym, Rx becomes $MOV [email protected], Rx
		// $MOV $sym+<off>, Rx becomes $MOV [email protected], Rx; $LEA <off>(Rx), Rx
		// On 386 only, more complicated things like PUSHL $sym become $MOV [email protected], CX; PUSHL CX
		cmplxdest := false
		pAs := p.As
		var dest obj.Addr
		if p.To.Type != obj.TYPE_REG || pAs != mov {
			if p.Mode == 64 {
				ctxt.Diag("do not know how to handle LEA-type insn to non-register in %v with -dynlink", p)
			}
			cmplxdest = true
			dest = p.To
			p.As = mov
			p.To.Type = obj.TYPE_REG
			p.To.Reg = REG_CX
			p.To.Sym = nil
			p.To.Name = obj.NAME_NONE
		}
		p.From.Type = obj.TYPE_MEM
		p.From.Name = obj.NAME_GOTREF
		q := p
		if p.From.Offset != 0 {
			q = obj.Appendp(ctxt, p)
			q.As = lea
			q.From.Type = obj.TYPE_MEM
			q.From.Reg = p.To.Reg
			q.From.Offset = p.From.Offset
			q.To = p.To
			p.From.Offset = 0
		}
		if cmplxdest {
			q = obj.Appendp(ctxt, q)
			q.As = pAs
			q.To = dest
			q.From.Type = obj.TYPE_REG
			q.From.Reg = REG_CX
		}
	}
	if p.From3 != nil && p.From3.Name == obj.NAME_EXTERN {
		ctxt.Diag("don't know how to handle %v with -dynlink", p)
	}
	var source *obj.Addr
//.........這裏部分代碼省略.........

開發者ID:duhaibo0404，項目名稱:go-1，代碼行數:101，代碼來源:obj6.go

示例9: xfol

func xfol(ctxt *obj.Link, p *obj.Prog, last **obj.Prog) {
	var q *obj.Prog
	var r *obj.Prog
	var a int
	var i int

loop:
	if p == nil {
		return
	}
	a = int(p.As)
	if a == AB {
		q = p.Pcond
		if q != nil && q.As != obj.ATEXT {
			p.Mark |= FOLL
			p = q
			if p.Mark&FOLL == 0 {
				goto loop
			}
		}
	}

	if p.Mark&FOLL != 0 {
		i = 0
		q = p
		for ; i < 4; i, q = i+1, q.Link {
			if q == *last || q == nil {
				break
			}
			a = int(q.As)
			if a == obj.ANOP {
				i--
				continue
			}

			if a == AB || (a == obj.ARET && q.Scond == C_SCOND_NONE) || a == ARFE || a == obj.AUNDEF {
				goto copy
			}
			if q.Pcond == nil || (q.Pcond.Mark&FOLL != 0) {
				continue
			}
			if a != ABEQ && a != ABNE {
				continue
			}

		copy:
			for {
				r = ctxt.NewProg()
				*r = *p
				if r.Mark&FOLL == 0 {
					fmt.Printf("can't happen 1\n")
				}
				r.Mark |= FOLL
				if p != q {
					p = p.Link
					(*last).Link = r
					*last = r
					continue
				}

				(*last).Link = r
				*last = r
				if a == AB || (a == obj.ARET && q.Scond == C_SCOND_NONE) || a == ARFE || a == obj.AUNDEF {
					return
				}
				r.As = ABNE
				if a == ABNE {
					r.As = ABEQ
				}
				r.Pcond = p.Link
				r.Link = p.Pcond
				if r.Link.Mark&FOLL == 0 {
					xfol(ctxt, r.Link, last)
				}
				if r.Pcond.Mark&FOLL == 0 {
					fmt.Printf("can't happen 2\n")
				}
				return
			}
		}

		a = AB
		q = ctxt.NewProg()
		q.As = int16(a)
		q.Lineno = p.Lineno
		q.To.Type = obj.TYPE_BRANCH
		q.To.Offset = p.Pc
		q.Pcond = p
		p = q
	}

	p.Mark |= FOLL
	(*last).Link = p
	*last = p
	if a == AB || (a == obj.ARET && p.Scond == C_SCOND_NONE) || a == ARFE || a == obj.AUNDEF {
		return
	}

	if p.Pcond != nil {
		if a != ABL && a != ABX && p.Link != nil {
//.........這裏部分代碼省略.........

開發者ID:arnold8，項目名稱:go，代碼行數:101，代碼來源:obj5.go

示例10: aclass

func aclass(ctxt *obj.Link, a *obj.Addr) int {
	switch a.Type {
	case obj.TYPE_NONE:
		return C_NONE

	case obj.TYPE_REG:
		if REG_R0 <= a.Reg && a.Reg <= REG_R31 {
			return C_REG
		}
		if REG_F0 <= a.Reg && a.Reg <= REG_F31 {
			return C_FREG
		}
		if REG_M0 <= a.Reg && a.Reg <= REG_M31 {
			return C_MREG
		}
		if REG_FCR0 <= a.Reg && a.Reg <= REG_FCR31 {
			return C_FCREG
		}
		if a.Reg == REG_LO {
			return C_LO
		}
		if a.Reg == REG_HI {
			return C_HI
		}
		return C_GOK

	case obj.TYPE_MEM:
		switch a.Name {
		case obj.NAME_EXTERN,
			obj.NAME_STATIC:
			if a.Sym == nil {
				break
			}
			ctxt.Instoffset = a.Offset
			if a.Sym != nil { // use relocation
				return C_ADDR
			}
			return C_LEXT

		case obj.NAME_AUTO:
			ctxt.Instoffset = int64(ctxt.Autosize) + a.Offset
			if ctxt.Instoffset >= -BIG && ctxt.Instoffset < BIG {
				return C_SAUTO
			}
			return C_LAUTO

		case obj.NAME_PARAM:
			ctxt.Instoffset = int64(ctxt.Autosize) + a.Offset + 8
			if ctxt.Instoffset >= -BIG && ctxt.Instoffset < BIG {
				return C_SAUTO
			}
			return C_LAUTO

		case obj.NAME_NONE:
			ctxt.Instoffset = a.Offset
			if ctxt.Instoffset == 0 {
				return C_ZOREG
			}
			if ctxt.Instoffset >= -BIG && ctxt.Instoffset < BIG {
				return C_SOREG
			}
			return C_LOREG
		}

		return C_GOK

	case obj.TYPE_TEXTSIZE:
		return C_TEXTSIZE

	case obj.TYPE_CONST,
		obj.TYPE_ADDR:
		switch a.Name {
		case obj.NAME_NONE:
			ctxt.Instoffset = a.Offset
			if a.Reg != 0 {
				if -BIG <= ctxt.Instoffset && ctxt.Instoffset <= BIG {
					return C_SACON
				}
				if isint32(ctxt.Instoffset) {
					return C_LACON
				}
				return C_DACON
			}

			goto consize

		case obj.NAME_EXTERN,
			obj.NAME_STATIC:
			s := a.Sym
			if s == nil {
				break
			}
			if s.Type == obj.SCONST {
				ctxt.Instoffset = s.Value + a.Offset
				goto consize
			}

			ctxt.Instoffset = s.Value + a.Offset

			/* not sure why this barfs */
//.........這裏部分代碼省略.........

開發者ID:danny8002，項目名稱:go，代碼行數:101，代碼來源:asm0.go

示例11: opirr

func opirr(ctxt *obj.Link, a int) uint32 {
	switch a {
	case AADD:
		return SP(1, 0)
	case AADDU:
		return SP(1, 1)
	case ASGT:
		return SP(1, 2)
	case ASGTU:
		return SP(1, 3)
	case AAND:
		return SP(1, 4)
	case AOR:
		return SP(1, 5)
	case AXOR:
		return SP(1, 6)
	case ALAST:
		return SP(1, 7) /* lui */
	case ASLL:
		return OP(0, 0)
	case ASRL:
		return OP(0, 2)
	case ASRA:
		return OP(0, 3)
	case AADDV:
		return SP(3, 0)
	case AADDVU:
		return SP(3, 1)

	case AJMP:
		return SP(0, 2)
	case AJAL,
		obj.ADUFFZERO,
		obj.ADUFFCOPY:
		return SP(0, 3)
	case ABEQ:
		return SP(0, 4)
	case ABEQ + ALAST:
		return SP(2, 4) /* likely */
	case ABNE:
		return SP(0, 5)
	case ABNE + ALAST:
		return SP(2, 5) /* likely */
	case ABGEZ:
		return SP(0, 1) | BCOND(0, 1)
	case ABGEZ + ALAST:
		return SP(0, 1) | BCOND(0, 3) /* likely */
	case ABGEZAL:
		return SP(0, 1) | BCOND(2, 1)
	case ABGEZAL + ALAST:
		return SP(0, 1) | BCOND(2, 3) /* likely */
	case ABGTZ:
		return SP(0, 7)
	case ABGTZ + ALAST:
		return SP(2, 7) /* likely */
	case ABLEZ:
		return SP(0, 6)
	case ABLEZ + ALAST:
		return SP(2, 6) /* likely */
	case ABLTZ:
		return SP(0, 1) | BCOND(0, 0)
	case ABLTZ + ALAST:
		return SP(0, 1) | BCOND(0, 2) /* likely */
	case ABLTZAL:
		return SP(0, 1) | BCOND(2, 0)
	case ABLTZAL + ALAST:
		return SP(0, 1) | BCOND(2, 2) /* likely */
	case ABFPT:
		return SP(2, 1) | (257 << 16)
	case ABFPT + ALAST:
		return SP(2, 1) | (259 << 16) /* likely */
	case ABFPF:
		return SP(2, 1) | (256 << 16)
	case ABFPF + ALAST:
		return SP(2, 1) | (258 << 16) /* likely */

	case AMOVB,
		AMOVBU:
		return SP(5, 0)
	case AMOVH,
		AMOVHU:
		return SP(5, 1)
	case AMOVW,
		AMOVWU:
		return SP(5, 3)
	case AMOVV:
		return SP(7, 7)
	case AMOVF:
		return SP(7, 1)
	case AMOVD:
		return SP(7, 5)
	case AMOVWL:
		return SP(5, 2)
	case AMOVWR:
		return SP(5, 6)
	case AMOVVL:
		return SP(5, 4)
	case AMOVVR:
		return SP(5, 5)

//.........這裏部分代碼省略.........

開發者ID:danny8002，項目名稱:go，代碼行數:101，代碼來源:asm0.go

示例12: vregoff

func vregoff(ctxt *obj.Link, a *obj.Addr) int64 {
	ctxt.Instoffset = 0
	aclass(ctxt, a)
	return ctxt.Instoffset
}

開發者ID:danny8002，項目名稱:go，代碼行數:5，代碼來源:asm0.go

示例13: preprocess

func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
	autosize := int32(0)

	ctxt.Cursym = cursym

	if cursym.Text == nil || cursym.Text.Link == nil {
		return
	}

	softfloat(ctxt, cursym)

	p := cursym.Text
	autoffset := int32(p.To.Offset)
	if autoffset < 0 {
		autoffset = 0
	}
	cursym.Locals = autoffset
	cursym.Args = p.To.Val.(int32)

	/*
	 * find leaf subroutines
	 * strip NOPs
	 * expand RET
	 * expand BECOME pseudo
	 */
	var q1 *obj.Prog
	var q *obj.Prog
	for p := cursym.Text; p != nil; p = p.Link {
		switch p.As {
		case obj.ATEXT:
			p.Mark |= LEAF

		case obj.ARET:
			break

		case ADIV, ADIVU, AMOD, AMODU:
			q = p
			if ctxt.Sym_div == nil {
				initdiv(ctxt)
			}
			cursym.Text.Mark &^= LEAF
			continue

		case obj.ANOP:
			q1 = p.Link
			q.Link = q1 /* q is non-nop */
			if q1 != nil {
				q1.Mark |= p.Mark
			}
			continue

		case ABL,
			ABX,
			obj.ADUFFZERO,
			obj.ADUFFCOPY:
			cursym.Text.Mark &^= LEAF
			fallthrough

		case AB,
			ABEQ,
			ABNE,
			ABCS,
			ABHS,
			ABCC,
			ABLO,
			ABMI,
			ABPL,
			ABVS,
			ABVC,
			ABHI,
			ABLS,
			ABGE,
			ABLT,
			ABGT,
			ABLE:
			q1 = p.Pcond
			if q1 != nil {
				for q1.As == obj.ANOP {
					q1 = q1.Link
					p.Pcond = q1
				}
			}
		}

		q = p
	}

	var o int
	var p1 *obj.Prog
	var p2 *obj.Prog
	var q2 *obj.Prog
	for p := cursym.Text; p != nil; p = p.Link {
		o = int(p.As)
		switch o {
		case obj.ATEXT:
			autosize = int32(p.To.Offset + 4)
			if autosize <= 4 {
				if cursym.Text.Mark&LEAF != 0 {
					p.To.Offset = -4
					autosize = 0
//.........這裏部分代碼省略.........

開發者ID:arnold8，項目名稱:go，代碼行數:101，代碼來源:obj5.go

示例14: preprocess

func preprocess(ctxt *obj.Link, cursym *obj.LSym) {
	// TODO(minux): add morestack short-cuts with small fixed frame-size.
	ctxt.Cursym = cursym

	if cursym.Text == nil || cursym.Text.Link == nil {
		return
	}

	p := cursym.Text
	textstksiz := p.To.Offset
	if textstksiz == -8 {
		// Compatibility hack.
		p.From3.Offset |= obj.NOFRAME
		textstksiz = 0
	}
	if textstksiz%8 != 0 {
		ctxt.Diag("frame size %d not a multiple of 8", textstksiz)
	}
	if p.From3.Offset&obj.NOFRAME != 0 {
		if textstksiz != 0 {
			ctxt.Diag("NOFRAME functions must have a frame size of 0, not %d", textstksiz)
		}
	}

	cursym.Args = p.To.Val.(int32)
	cursym.Locals = int32(textstksiz)

	/*
	 * find leaf subroutines
	 * strip NOPs
	 * expand RET
	 * expand BECOME pseudo
	 */
	if ctxt.Debugvlog != 0 {
		fmt.Fprintf(ctxt.Bso, "%5.2f noops\n", obj.Cputime())
	}
	ctxt.Bso.Flush()

	var q *obj.Prog
	var q1 *obj.Prog
	for p := cursym.Text; p != nil; p = p.Link {
		switch p.As {
		/* too hard, just leave alone */
		case obj.ATEXT:
			q = p

			p.Mark |= LABEL | LEAF | SYNC
			if p.Link != nil {
				p.Link.Mark |= LABEL
			}

		case ANOR:
			q = p
			if p.To.Type == obj.TYPE_REG {
				if p.To.Reg == REGZERO {
					p.Mark |= LABEL | SYNC
				}
			}

		case ALWAR,
			ASTWCCC,
			AECIWX,
			AECOWX,
			AEIEIO,
			AICBI,
			AISYNC,
			ATLBIE,
			ATLBIEL,
			ASLBIA,
			ASLBIE,
			ASLBMFEE,
			ASLBMFEV,
			ASLBMTE,
			ADCBF,
			ADCBI,
			ADCBST,
			ADCBT,
			ADCBTST,
			ADCBZ,
			ASYNC,
			ATLBSYNC,
			APTESYNC,
			ATW,
			AWORD,
			ARFI,
			ARFCI,
			ARFID,
			AHRFID:
			q = p
			p.Mark |= LABEL | SYNC
			continue

		case AMOVW, AMOVWZ, AMOVD:
			q = p
			if p.From.Reg >= REG_SPECIAL || p.To.Reg >= REG_SPECIAL {
				p.Mark |= LABEL | SYNC
			}
			continue

		case AFABS,
//.........這裏部分代碼省略.........

開發者ID:gmwu，項目名稱:go，代碼行數:101，代碼來源:obj9.go

示例15: rewriteToUseGot

// Rewrite p, if necessary, to access global data via the global offset table.
func rewriteToUseGot(ctxt *obj.Link, p *obj.Prog) {
	if p.As == obj.ADUFFCOPY || p.As == obj.ADUFFZERO {
		//     ADUFFxxx $offset
		// becomes
		//     MOVD [email protected], R12
		//     ADD $offset, R12
		//     MOVD R12, CTR
		//     BL (CTR)
		var sym *obj.LSym
		if p.As == obj.ADUFFZERO {
			sym = obj.Linklookup(ctxt, "runtime.duffzero", 0)
		} else {
			sym = obj.Linklookup(ctxt, "runtime.duffcopy", 0)
		}
		offset := p.To.Offset
		p.As = AMOVD
		p.From.Type = obj.TYPE_MEM
		p.From.Name = obj.NAME_GOTREF
		p.From.Sym = sym
		p.To.Type = obj.TYPE_REG
		p.To.Reg = REG_R12
		p.To.Name = obj.NAME_NONE
		p.To.Offset = 0
		p.To.Sym = nil
		p1 := obj.Appendp(ctxt, p)
		p1.As = AADD
		p1.From.Type = obj.TYPE_CONST
		p1.From.Offset = offset
		p1.To.Type = obj.TYPE_REG
		p1.To.Reg = REG_R12
		p2 := obj.Appendp(ctxt, p1)
		p2.As = AMOVD
		p2.From.Type = obj.TYPE_REG
		p2.From.Reg = REG_R12
		p2.To.Type = obj.TYPE_REG
		p2.To.Reg = REG_CTR
		p3 := obj.Appendp(ctxt, p2)
		p3.As = obj.ACALL
		p3.From.Type = obj.TYPE_REG
		p3.From.Reg = REG_R12
		p3.To.Type = obj.TYPE_REG
		p3.To.Reg = REG_CTR
	}

	// We only care about global data: NAME_EXTERN means a global
	// symbol in the Go sense, and p.Sym.Local is true for a few
	// internally defined symbols.
	if p.From.Type == obj.TYPE_ADDR && p.From.Name == obj.NAME_EXTERN && !p.From.Sym.Local {
		// MOVD $sym, Rx becomes MOVD [email protected], Rx
		// MOVD $sym+<off>, Rx becomes MOVD [email protected], Rx; ADD <off>, Rx
		if p.As != AMOVD {
			ctxt.Diag("do not know how to handle TYPE_ADDR in %v with -dynlink", p)
		}
		if p.To.Type != obj.TYPE_REG {
			ctxt.Diag("do not know how to handle LEAQ-type insn to non-register in %v with -dynlink", p)
		}
		p.From.Type = obj.TYPE_MEM
		p.From.Name = obj.NAME_GOTREF
		if p.From.Offset != 0 {
			q := obj.Appendp(ctxt, p)
			q.As = AADD
			q.From.Type = obj.TYPE_CONST
			q.From.Offset = p.From.Offset
			q.To = p.To
			p.From.Offset = 0
		}
	}
	if p.From3 != nil && p.From3.Name == obj.NAME_EXTERN {
		ctxt.Diag("don't know how to handle %v with -dynlink", p)
	}
	var source *obj.Addr
	// MOVx sym, Ry becomes MOVD [email protected], REGTMP; MOVx (REGTMP), Ry
	// MOVx Ry, sym becomes MOVD [email protected], REGTMP; MOVx Ry, (REGTMP)
	// An addition may be inserted between the two MOVs if there is an offset.
	if p.From.Name == obj.NAME_EXTERN && !p.From.Sym.Local {
		if p.To.Name == obj.NAME_EXTERN && !p.To.Sym.Local {
			ctxt.Diag("cannot handle NAME_EXTERN on both sides in %v with -dynlink", p)
		}
		source = &p.From
	} else if p.To.Name == obj.NAME_EXTERN && !p.To.Sym.Local {
		source = &p.To
	} else {
		return
	}
	if p.As == obj.ATEXT || p.As == obj.AFUNCDATA || p.As == obj.ACALL || p.As == obj.ARET || p.As == obj.AJMP {
		return
	}
	if source.Sym.Type == obj.STLSBSS {
		return
	}
	if source.Type != obj.TYPE_MEM {
		ctxt.Diag("don't know how to handle %v with -dynlink", p)
	}
	p1 := obj.Appendp(ctxt, p)
	p2 := obj.Appendp(ctxt, p1)

	p1.As = AMOVD
	p1.From.Type = obj.TYPE_MEM
	p1.From.Sym = source.Sym
//.........這裏部分代碼省略.........

開發者ID:gmwu，項目名稱:go，代碼行數:101，代碼來源:obj9.go

注：本文中的cmd/internal/obj.Link類示例由純淨天空整理自Github/MSDocs等開源代碼及文檔管理平台，相關代碼片段篩選自各路編程大神貢獻的開源項目，源碼版權歸原作者所有，傳播和使用請參考對應項目的License；未經允許，請勿轉載。