package types_test

import (
	"go/importer"
	"go/token"
	"path/filepath"
	"runtime"
	"testing"

	. "go/types"
)

// BenchmarkLookupFieldOrMethod measures types.LookupFieldOrMethod performance.
// LookupFieldOrMethod is a performance hotspot for both type-checking and
// external API calls.
func BenchmarkLookupFieldOrMethod(b *testing.B) {
	// Choose an arbitrary, large package.

	for _, test := range tests {
		src := prefix + test.decl
		pkg := mustTypecheck(src, nil, nil)
		typ := NewPointer(pkg.Scope().Lookup("X").Type())
		obj, _, _ := LookupFieldOrMethod(typ, false, pkg, "m")
		m, _ := obj.(*Func)
		if m == nil {
			t.Fatalf(`LookupFieldOrMethod(%s, "m") = %v, want func m`, typ, obj)
		}
		if got := ObjectString(m, RelativeTo(pkg)); got != test.want {
			t.Errorf("instantiated %q, want %q", got, test.want)

package types2_test

import (
	"path/filepath"
	"runtime"
	"testing"

	. "cmd/compile/internal/types2"
)

// BenchmarkLookupFieldOrMethod measures types.LookupFieldOrMethod performance.
// LookupFieldOrMethod is a performance hotspot for both type-checking and
// external API calls.
func BenchmarkLookupFieldOrMethod(b *testing.B) {
	// Choose an arbitrary, large package.

	for _, test := range tests {
		src := prefix + test.decl
		pkg := mustTypecheck(src, nil, nil)
		typ := NewPointer(pkg.Scope().Lookup("X").Type())
		obj, _, _ := LookupFieldOrMethod(typ, false, pkg, "m")
		m, _ := obj.(*Func)
		if m == nil {
			t.Fatalf(`LookupFieldOrMethod(%s, "m") = %v, want func m`, typ, obj)
		}
		if got := ObjectString(m, RelativeTo(pkg)); got != test.want {
			t.Errorf("instantiated %q, want %q", got, test.want)

//     the method's formal receiver base type, nor was the receiver addressable.
func LookupFieldOrMethod(T Type, addressable bool, pkg *Package, name string) (obj Object, index []int, indirect bool) {
	if T == nil {
		panic("LookupFieldOrMethod on nil type")
	}
	return lookupFieldOrMethod(T, addressable, pkg, name, false)
}

// lookupFieldOrMethod is like LookupFieldOrMethod but with the additional foldCase parameter

//     the method's formal receiver base type, nor was the receiver addressable.
func LookupFieldOrMethod(T Type, addressable bool, pkg *Package, name string) (obj Object, index []int, indirect bool) {
	if T == nil {
		panic("LookupFieldOrMethod on nil type")
	}
	return lookupFieldOrMethod(T, addressable, pkg, name, false)
}

// lookupFieldOrMethod is like LookupFieldOrMethod but with the additional foldCase parameter

//       internally if LookupFieldOrMethod completed the same
//       interfaces beforehand.

// NewMethodSet returns the method set for the given type T.
// It always returns a non-nil method set, even if it is empty.
func NewMethodSet(T Type) *MethodSet {
	// WARNING: The code in this function is extremely subtle - do not modify casually!
	//          This function and lookupFieldOrMethod should be kept in sync.

			if t := pkg.Scope().Lookup(typename); t != nil && disallowed[t] == "" {
				obj, _, _ = types.LookupFieldOrMethod(t.Type(), false, pkg, name)
			}

		case stdlib.Method:
			ptr, recvname, name := sym.SplitMethod()
			if t := pkg.Scope().Lookup(recvname); t != nil && disallowed[t] == "" {
				obj, _, _ = types.LookupFieldOrMethod(t.Type(), ptr, pkg, name)
			}
		}
		if obj != nil {
			disallowed[obj] = symVersion
		}
	}

	// get original error.Error method
	eface := Universe.Lookup("error")
	orig, _, _ := LookupFieldOrMethod(eface.Type(), false, nil, "Error")
	if orig == nil {
		t.Fatalf("original error.Error not found")
	}

	// get embedded error.Error method
	iface := pkg.Scope().Lookup("I")
	embed, _, _ := LookupFieldOrMethod(iface.Type(), false, nil, "Error")
	if embed == nil {
		t.Fatalf("embedded error.Error not found")
	}

	// get original error.Error method
	eface := Universe.Lookup("error")
	orig, _, _ := LookupFieldOrMethod(eface.Type(), false, nil, "Error")
	if orig == nil {
		t.Fatalf("original error.Error not found")
	}

	// get embedded error.Error method
	iface := pkg.Scope().Lookup("I")
	embed, _, _ := LookupFieldOrMethod(iface.Type(), false, nil, "Error")
	if embed == nil {
		t.Fatalf("embedded error.Error not found")
	}