//getFullName is returning unique name of obj.
func getFullName(obj types.Object, ctx *getDefinitionsContext, isType bool) string {
if obj == nil {
return ""
}
if isType {
return obj.Type().String()
}
result := ""
switch obj.(type) {
case *types.Func:
f := obj.(*types.Func)
r := strings.NewReplacer("(", "", "*", "", ")", "")
result = r.Replace(f.FullName())
default:
if obj.Pkg() != nil {
result += obj.Pkg().Path()
result += "."
}
if packageName, ok := ctx.structs[posToStr(ctx.fset, obj.Pos())]; ok {
result += packageName
result += "."
}
result += obj.Name()
}
return result
}
func (p *exporter) fileLine(obj types.Object) (file string, line int) {
if p.fset != nil {
pos := p.fset.Position(obj.Pos())
file = pos.Filename
line = pos.Line
}
return
}
func (v *visitor) decl(obj types.Object) {
key := getKey(obj)
if _, ok := v.uses[key]; !ok {
v.uses[key] = 0
}
if _, ok := v.positions[key]; !ok {
v.positions[key] = v.prog.Fset.Position(obj.Pos())
}
}
// memberFromObject populates package pkg with a member for the
// typechecker object obj.
//
// For objects from Go source code, syntax is the associated syntax
// tree (for funcs and vars only); it will be used during the build
// phase.
//
func memberFromObject(pkg *Package, obj types.Object, syntax ast.Node) {
name := obj.Name()
switch obj := obj.(type) {
case *types.TypeName:
pkg.Members[name] = &Type{
object: obj,
pkg: pkg,
}
case *types.Const:
c := &NamedConst{
object: obj,
Value: NewConst(obj.Val(), obj.Type()),
pkg: pkg,
}
pkg.values[obj] = c.Value
pkg.Members[name] = c
case *types.Var:
g := &Global{
Pkg: pkg,
name: name,
object: obj,
typ: types.NewPointer(obj.Type()), // address
pos: obj.Pos(),
}
pkg.values[obj] = g
pkg.Members[name] = g
case *types.Func:
sig := obj.Type().(*types.Signature)
if sig.Recv() == nil && name == "init" {
pkg.ninit++
name = fmt.Sprintf("init#%d", pkg.ninit)
}
fn := &Function{
name: name,
object: obj,
Signature: sig,
syntax: syntax,
pos: obj.Pos(),
Pkg: pkg,
Prog: pkg.Prog,
}
if syntax == nil {
fn.Synthetic = "loaded from gc object file"
}
pkg.values[obj] = fn
if sig.Recv() == nil {
pkg.Members[name] = fn // package-level function
}
default: // (incl. *types.Package)
panic("unexpected Object type: " + obj.String())
}
}
func (f *Function) addParamObj(obj types.Object) *Parameter {
name := obj.Name()
if name == "" {
name = fmt.Sprintf("arg%d", len(f.Params))
}
param := f.addParam(name, obj.Type(), obj.Pos())
param.object = obj
return param
}
// addSpilledParam declares a parameter that is pre-spilled to the
// stack; the function body will load/store the spilled location.
// Subsequent lifting will eliminate spills where possible.
//
func (f *Function) addSpilledParam(obj types.Object) {
param := f.addParamObj(obj)
spill := &Alloc{Comment: obj.Name()}
spill.setType(types.NewPointer(obj.Type()))
spill.setPos(obj.Pos())
f.objects[obj] = spill
f.Locals = append(f.Locals, spill)
f.emit(spill)
f.emit(&Store{Addr: spill, Val: param})
}
func (r *renamer) checkExport(id *ast.Ident, pkg *types.Package, from types.Object) bool {
// Reject cross-package references if r.to is unexported.
// (Such references may be qualified identifiers or field/method
// selections.)
if !ast.IsExported(r.to) && pkg != from.Pkg() {
r.errorf(from.Pos(),
"renaming this %s %q to %q would make it unexported",
objectKind(from), from.Name(), r.to)
r.errorf(id.Pos(), "\tbreaking references from packages such as %q",
pkg.Path())
return false
}
return true
}
func printTargetObj(obj types.Object) {
if obj != nil && obj.Pos() != token.NoPos {
fmt.Println(posPrinter{obj})
return
}
if *godef != "" {
cmd := exec.Command(*godef, os.Args[1:]...)
cmd.Stdin = bytes.NewReader(fileBody)
b, err := cmd.Output()
if err != nil {
fail()
}
os.Stdout.Write(b)
return
}
fail()
}
func (r *renamer) checkInLocalScope(from types.Object) {
info := r.packages[from.Pkg()]
// Is this object an implicit local var for a type switch?
// Each case has its own var, whose position is the decl of y,
// but Ident in that decl does not appear in the Uses map.
//
// switch y := x.(type) { // Defs[Ident(y)] is undefined
// case int: print(y) // Implicits[CaseClause(int)] = Var(y_int)
// case string: print(y) // Implicits[CaseClause(string)] = Var(y_string)
// }
//
var isCaseVar bool
for syntax, obj := range info.Implicits {
if _, ok := syntax.(*ast.CaseClause); ok && obj.Pos() == from.Pos() {
isCaseVar = true
r.check(obj)
}
}
r.checkInLexicalScope(from, info)
// Finally, if this was a type switch, change the variable y.
if isCaseVar {
_, path, _ := r.iprog.PathEnclosingInterval(from.Pos(), from.Pos())
path[0].(*ast.Ident).Name = r.to // path is [Ident AssignStmt TypeSwitchStmt...]
}
}
// checkInPackageBlock performs safety checks for renames of
// func/var/const/type objects in the package block.
func (r *renamer) checkInPackageBlock(from types.Object) {
// Check that there are no references to the name from another
// package if the renaming would make it unexported.
if ast.IsExported(from.Name()) && !ast.IsExported(r.to) {
for pkg, info := range r.packages {
if pkg == from.Pkg() {
continue
}
if id := someUse(info, from); id != nil &&
!r.checkExport(id, pkg, from) {
break
}
}
}
info := r.packages[from.Pkg()]
// Check that in the package block, "init" is a function, and never referenced.
if r.to == "init" {
kind := objectKind(from)
if kind == "func" {
// Reject if intra-package references to it exist.
for id, obj := range info.Uses {
if obj == from {
r.errorf(from.Pos(),
"renaming this func %q to %q would make it a package initializer",
from.Name(), r.to)
r.errorf(id.Pos(), "\tbut references to it exist")
break
}
}
} else {
r.errorf(from.Pos(), "you cannot have a %s at package level named %q",
kind, r.to)
}
}
// Check for conflicts between package block and all file blocks.
for _, f := range info.Files {
fileScope := info.Info.Scopes[f]
b, prev := fileScope.LookupParent(r.to, token.NoPos)
if b == fileScope {
r.errorf(from.Pos(), "renaming this %s %q to %q would conflict",
objectKind(from), from.Name(), r.to)
r.errorf(prev.Pos(), "\twith this %s",
objectKind(prev))
return // since checkInPackageBlock would report redundant errors
}
}
// Check for conflicts in lexical scope.
if from.Exported() {
for _, info := range r.packages {
r.checkInLexicalScope(from, info)
}
} else {
r.checkInLexicalScope(from, info)
}
}
// check performs safety checks of the renaming of the 'from' object to r.to.
func (r *renamer) check(from types.Object) {
if r.objsToUpdate[from] {
return
}
r.objsToUpdate[from] = true
// NB: order of conditions is important.
if from_, ok := from.(*types.PkgName); ok {
r.checkInFileBlock(from_)
} else if from_, ok := from.(*types.Label); ok {
r.checkLabel(from_)
} else if isPackageLevel(from) {
r.checkInPackageBlock(from)
} else if v, ok := from.(*types.Var); ok && v.IsField() {
r.checkStructField(v)
} else if f, ok := from.(*types.Func); ok && recv(f) != nil {
r.checkMethod(f)
} else if isLocal(from) {
r.checkInLocalScope(from)
} else {
r.errorf(from.Pos(), "unexpected %s object %q (please report a bug)\n",
objectKind(from), from)
}
}
func saveRecent(ident *ast.Ident, obj types.Object) {
if *cacheFile == "" {
return
}
if obj == nil || obj.Pos() == token.NoPos {
return
}
if fset.Position(ident.Pos()).Filename == fset.Position(obj.Pos()).Filename {
lg("same file")
return
}
k := posPrinter{ident}.String()
sha := fileSHA(fset.Position(obj.Pos()).Filename)
if sha == "" {
return
}
now := time.Now()
ent := &objectEntry{
FromSHA1: fileSHA1,
ToPos: posPrinter{obj}.String(),
ToSHA1: sha,
Created: now.UnixNano(),
}
lg("new recent entry %s => %+v", k, ent)
if recents == nil {
recents = &recentObjects{entries: make(map[string]*objectEntry)}
}
recents.entries[k] = ent
expire := now.Add(-24 * time.Hour).UnixNano()
for k, ent := range recents.entries {
if ent.bad || ent.Created < expire {
delete(recents.entries, k)
}
}
b, err := json.MarshalIndent(recents.entries, "", " ")
if err != nil {
lg("marshal recents err=%v", err)
return
}
if err = ioutil.WriteFile(*cacheFile, b, 0600); err != nil {
lg("write recents err=%v", err)
}
}
func (r *renamer) selectionConflict(from types.Object, delta int, syntax *ast.SelectorExpr, obj types.Object) {
r.errorf(from.Pos(), "renaming this %s %q to %q",
objectKind(from), from.Name(), r.to)
switch {
case delta < 0:
// analogous to sub-block conflict
r.errorf(syntax.Sel.Pos(),
"\twould change the referent of this selection")
r.errorf(obj.Pos(), "\tof this %s", objectKind(obj))
case delta == 0:
// analogous to same-block conflict
r.errorf(syntax.Sel.Pos(),
"\twould make this reference ambiguous")
r.errorf(obj.Pos(), "\twith this %s", objectKind(obj))
case delta > 0:
// analogous to super-block conflict
r.errorf(syntax.Sel.Pos(),
"\twould shadow this selection")
r.errorf(obj.Pos(), "\tof the %s declared here",
objectKind(obj))
}
}
func fileLine(fset *token.FileSet, obj types.Object) string {
posn := fset.Position(obj.Pos())
return fmt.Sprintf("%s:%d", posn.Filename, posn.Line)
}
func formatNode(n ast.Node, obj types.Object, prog *loader.Program) string {
var nc ast.Node
// Render a copy of the node with no documentation.
// We emit the documentation ourself.
switch n := n.(type) {
case *ast.FuncDecl:
cp := *n
cp.Doc = nil
// Don't print the whole function body
cp.Body = nil
nc = &cp
case *ast.GenDecl:
cp := *n
cp.Doc = nil
if len(n.Specs) > 0 {
// Only print this one type, not all the types in the
// gendecl
switch n.Specs[0].(type) {
case *ast.TypeSpec:
spec := findTypeSpec(n, obj.Pos())
if spec != nil {
specCp := *spec
if *showUnexportedFields == false {
trimUnexportedElems(&specCp)
}
specCp.Doc = nil
cp.Specs = []ast.Spec{&specCp}
}
cp.Lparen = 0
cp.Rparen = 0
case *ast.ValueSpec:
spec := findVarSpec(n, obj.Pos())
if spec != nil {
specCp := *spec
specCp.Doc = nil
cp.Specs = []ast.Spec{&specCp}
}
cp.Lparen = 0
cp.Rparen = 0
}
}
nc = &cp
case *ast.Field:
// Not supported by go/printer
// TODO(dominikh): Methods in interfaces are syntactically
// represented as fields. Using types.Object.String for those
// causes them to look different from real functions.
// go/printer doesn't include the import paths in names, while
// Object.String does. Fix that.
return obj.String()
default:
return obj.String()
}
buf := &bytes.Buffer{}
cfg := printer.Config{Mode: printer.UseSpaces | printer.TabIndent, Tabwidth: 8}
err := cfg.Fprint(buf, prog.Fset, nc)
if err != nil {
return obj.String()
}
return buf.String()
}
// addNamedLocal creates a local variable, adds it to function f and
// returns it. Its name and type are taken from obj. Subsequent
// calls to f.lookup(obj) will return the same local.
//
func (f *Function) addNamedLocal(obj types.Object) *Alloc {
l := f.addLocal(obj.Type(), obj.Pos())
l.Comment = obj.Name()
f.objects[obj] = l
return l
}
// checkInLexicalScope performs safety checks that a renaming does not
// change the lexical reference structure of the specified package.
//
// For objects in lexical scope, there are three kinds of conflicts:
// same-, sub-, and super-block conflicts. We will illustrate all three
// using this example:
//
// var x int
// var z int
//
// func f(y int) {
// print(x)
// print(y)
// }
//
// Renaming x to z encounters a SAME-BLOCK CONFLICT, because an object
// with the new name already exists, defined in the same lexical block
// as the old object.
//
// Renaming x to y encounters a SUB-BLOCK CONFLICT, because there exists
// a reference to x from within (what would become) a hole in its scope.
// The definition of y in an (inner) sub-block would cast a shadow in
// the scope of the renamed variable.
//
// Renaming y to x encounters a SUPER-BLOCK CONFLICT. This is the
// converse situation: there is an existing definition of the new name
// (x) in an (enclosing) super-block, and the renaming would create a
// hole in its scope, within which there exist references to it. The
// new name casts a shadow in scope of the existing definition of x in
// the super-block.
//
// Removing the old name (and all references to it) is always safe, and
// requires no checks.
//
func (r *renamer) checkInLexicalScope(from types.Object, info *loader.PackageInfo) {
b := from.Parent() // the block defining the 'from' object
if b != nil {
toBlock, to := b.LookupParent(r.to, from.Parent().End())
if toBlock == b {
// same-block conflict
r.errorf(from.Pos(), "renaming this %s %q to %q",
objectKind(from), from.Name(), r.to)
r.errorf(to.Pos(), "\tconflicts with %s in same block",
objectKind(to))
return
} else if toBlock != nil {
// Check for super-block conflict.
// The name r.to is defined in a superblock.
// Is that name referenced from within this block?
forEachLexicalRef(info, to, func(id *ast.Ident, block *types.Scope) bool {
_, obj := lexicalLookup(block, from.Name(), id.Pos())
if obj == from {
// super-block conflict
r.errorf(from.Pos(), "renaming this %s %q to %q",
objectKind(from), from.Name(), r.to)
r.errorf(id.Pos(), "\twould shadow this reference")
r.errorf(to.Pos(), "\tto the %s declared here",
objectKind(to))
return false // stop
}
return true
})
}
}
// Check for sub-block conflict.
// Is there an intervening definition of r.to between
// the block defining 'from' and some reference to it?
forEachLexicalRef(info, from, func(id *ast.Ident, block *types.Scope) bool {
// Find the block that defines the found reference.
// It may be an ancestor.
fromBlock, _ := lexicalLookup(block, from.Name(), id.Pos())
// See what r.to would resolve to in the same scope.
toBlock, to := lexicalLookup(block, r.to, id.Pos())
if to != nil {
// sub-block conflict
if deeper(toBlock, fromBlock) {
r.errorf(from.Pos(), "renaming this %s %q to %q",
objectKind(from), from.Name(), r.to)
r.errorf(id.Pos(), "\twould cause this reference to become shadowed")
r.errorf(to.Pos(), "\tby this intervening %s definition",
objectKind(to))
return false // stop
}
}
return true
})
// Renaming a type that is used as an embedded field
// requires renaming the field too. e.g.
// type T int // if we rename this to U..
// var s struct {T}
// print(s.T) // ...this must change too
if _, ok := from.(*types.TypeName); ok {
for id, obj := range info.Uses {
if obj == from {
if field := info.Defs[id]; field != nil {
r.check(field)
}
}
}
}
}
