import (
	"cmd/compile/internal/types"
	"cmd/internal/obj"
)

// Syms holds known symbols.
var Syms symsStruct

type symsStruct struct {
	AssertE2I         *obj.LSym
	AssertE2I2        *obj.LSym
	AssertI2I         *obj.LSym
	AssertI2I2        *obj.LSym
	Asanread          *obj.LSym
	Asanwrite         *obj.LSym
	CgoCheckMemmove   *obj.LSym
	CgoCheckPtrWrite  *obj.LSym
	CheckPtrAlignment *obj.LSym

	{"runtime.convTnoptr", 1},
	{"runtime.convT16", 1},
	{"runtime.convT32", 1},
	{"runtime.convT64", 1},
	{"runtime.convTstring", 1},
	{"runtime.convTslice", 1},
	{"runtime.assertE2I", 1},
	{"runtime.assertE2I2", 1},
	{"runtime.panicdottypeE", 1},
	{"runtime.panicdottypeI", 1},
	{"runtime.panicnildottype", 1},
	{"runtime.typeAssert", 1},
	{"runtime.interfaceSwitch", 1},
	{"runtime.ifaceeq", 1},
	{"runtime.efaceeq", 1},

func convT64(val uint64) unsafe.Pointer
func convTstring(val string) unsafe.Pointer
func convTslice(val []uint8) unsafe.Pointer

// interface type assertions x.(T)
func assertE2I(inter *byte, typ *byte) *byte
func assertE2I2(inter *byte, typ *byte) *byte
func panicdottypeE(have, want, iface *byte)
func panicdottypeI(have, want, iface *byte)
func panicnildottype(want *byte)
func typeAssert(s *byte, typ *byte) *byte

	{"convTnoptr", funcTag, 57},
	{"convT16", funcTag, 59},
	{"convT32", funcTag, 61},
	{"convT64", funcTag, 62},
	{"convTstring", funcTag, 63},
	{"convTslice", funcTag, 66},
	{"assertE2I", funcTag, 67},
	{"assertE2I2", funcTag, 67},
	{"panicdottypeE", funcTag, 68},
	{"panicdottypeI", funcTag, 68},
	{"panicnildottype", funcTag, 69},
	{"typeAssert", funcTag, 67},
	{"interfaceSwitch", funcTag, 70},
	{"ifaceeq", funcTag, 72},

		}
	case fint.Kind_&abi.KindMask == abi.Interface:
		ityp := (*interfacetype)(unsafe.Pointer(fint))
		if len(ityp.Methods) == 0 {
			// ok - satisfies empty interface
			goto okarg
		}
		if itab := assertE2I2(ityp, efaceOf(&obj)._type); itab != nil {
			goto okarg
		}
	}
	throw("runtime.SetFinalizer: cannot pass " + toRType(etyp).string() + " to finalizer " + toRType(ftyp).string())
okarg:

	if t == nil {
		// explicit conversions require non-nil interface value.
		panic(&TypeAssertionError{nil, nil, &inter.Type, ""})
	}
	return getitab(inter, t, false)
}

func assertE2I2(inter *interfacetype, t *_type) *itab {
	if t == nil {
		return nil
	}
	return getitab(inter, t, true)
}

// typeAssert builds an itab for the concrete type t and the

	// Set up some runtime functions we'll need to call.
	ir.Syms.AssertE2I = typecheck.LookupRuntimeFunc("assertE2I")
	ir.Syms.AssertE2I2 = typecheck.LookupRuntimeFunc("assertE2I2")
	ir.Syms.AssertI2I = typecheck.LookupRuntimeFunc("assertI2I")
	ir.Syms.AssertI2I2 = typecheck.LookupRuntimeFunc("assertI2I2")
	ir.Syms.CgoCheckMemmove = typecheck.LookupRuntimeFunc("cgoCheckMemmove")