// asmcheck -gcflags=-spectre=ret

//go:build amd64

package codegen

func CallFunc(f func()) {
	// amd64:`CALL\truntime.retpoline`
	f()
}

func CallInterface(x interface{ M() }) {
	// amd64:`CALL\truntime.retpoline`
	x.M()
}

// Check to make sure that jump tables are disabled
// when retpoline is on. See issue 57097.
func noJumpTables(x int) int {
	switch x {
	case 0:
		return 0
	case 1:
		return 1

TEXT runtime·retpolineR8(SB),NOSPLIT|NOFRAME,$0; RETPOLINE(8)
TEXT runtime·retpolineR9(SB),NOSPLIT|NOFRAME,$0; RETPOLINE(9)
TEXT runtime·retpolineR10(SB),NOSPLIT|NOFRAME,$0; RETPOLINE(10)
TEXT runtime·retpolineR11(SB),NOSPLIT|NOFRAME,$0; RETPOLINE(11)
TEXT runtime·retpolineR12(SB),NOSPLIT|NOFRAME,$0; RETPOLINE(12)
TEXT runtime·retpolineR13(SB),NOSPLIT|NOFRAME,$0; RETPOLINE(13)

		os.Exit(2)
	case "":
		// nothing
	case "index":
		// known to compiler; ignore here so people can use
		// the same list with -gcflags=-spectre=LIST and -asmflags=-spectrre=LIST
	case "all", "ret":
		ctxt.Retpoline = true
	}

	ctxt.Bso = bufio.NewWriter(os.Stdout)
	defer ctxt.Bso.Flush()

	architecture.Init(ctxt)

	// Create object file, write header.
	buf, err := bio.Create(*flags.OutputFile)
	if err != nil {

	Flag_dynlink       bool
	Flag_linkshared    bool
	Flag_optimize      bool
	Flag_locationlists bool
	Flag_noRefName     bool   // do not include referenced symbol names in object file
	Retpoline          bool   // emit use of retpoline stubs for indirect jmp/call
	Flag_maymorestack  string // If not "", call this function before stack checks
	Bso                *bufio.Writer
	Pathname           string

	const minCases = 8   // have at least minCases cases in the switch
	const minDensity = 4 // use at least 1 out of every minDensity entries

	if base.Flag.N != 0 || !ssagen.Arch.LinkArch.CanJumpTable || base.Ctxt.Retpoline {
		return false
	}
	if len(cc) < minCases {
		return false // not enough cases for it to be worth it
	}
	if cc[0].lo.Val().Kind() != constant.Int {
		return false // e.g. float
	}

}

var oprange [ALAST & obj.AMask][]Optab

var xcmp [C_NCLASS][C_NCLASS]bool

func span0(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
	if ctxt.Retpoline {
		ctxt.Diag("-spectre=ret not supported on mips")
		ctxt.Retpoline = false // don't keep printing
	}

	p := cursym.Func().Text
	if p == nil || p.Link == nil { // handle external functions and ELF section symbols
		return
	}

}

var oprange [ALAST & obj.AMask][]Optab

var xcmp [C_NCLASS][C_NCLASS]bool

func span0(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
	if ctxt.Retpoline {
		ctxt.Diag("-spectre=ret not supported on loong64")
		ctxt.Retpoline = false // don't keep printing
	}

	p := cursym.Func().Text
	if p == nil || p.Link == nil { // handle external functions and ELF section symbols
		return
	}

			}
		}
		if ctxt.Retpoline && (p.As == obj.ACALL || p.As == obj.AJMP) && (p.To.Type == obj.TYPE_REG || p.To.Type == obj.TYPE_MEM) {
			if p.To.Type != obj.TYPE_REG {
				ctxt.Diag("non-retpoline-compatible: %v", p)
				continue
			}
			p.To.Type = obj.TYPE_BRANCH
			p.To.Name = obj.NAME_EXTERN
			p.To.Sym = ctxt.Lookup("runtime.retpoline" + obj.Rconv(int(p.To.Reg)))
			p.To.Reg = 0

}

// assemble emits machine code.
// It is called at the very end of the assembly process.
func assemble(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
	if ctxt.Retpoline {
		ctxt.Diag("-spectre=ret not supported on riscv")
		ctxt.Retpoline = false // don't keep printing
	}

	// If errors were encountered during preprocess/validation, proceeding
	// and attempting to encode said instructions will only lead to panics.

	if p.Scond&C_UBIT != 0 && o.scond&C_UBIT == 0 {
		c.ctxt.Diag("invalid .U suffix: %v", p)
	}
}

func span5(ctxt *obj.Link, cursym *obj.LSym, newprog obj.ProgAlloc) {
	if ctxt.Retpoline {
		ctxt.Diag("-spectre=ret not supported on arm")
		ctxt.Retpoline = false // don't keep printing
	}

	var p *obj.Prog
	var op *obj.Prog

	p = cursym.Func().Text