func grindFunc(ctxt *grinder.Context, pkg *grinder.Package, edit *grinder.EditBuffer, fn *ast.FuncDecl) {
if fn.Name.Name == "evconst" {
old := debug
debug = true
defer func() { debug = old }()
}
if pkg.TypesError != nil {
// Without scoping information, we can't be sure code moves are okay.
fmt.Printf("%s: cannot inline gotos without type information\n", fn.Name)
return
}
if fn.Body == nil {
return
}
blocks := block.Build(pkg.FileSet, fn.Body)
for labelname, gotos := range blocks.Goto {
target, ok := findTargetBlock(pkg, edit, fn, blocks, labelname)
if debug {
println("TARGET", ok, labelname, len(gotos), target.dead, target.short)
}
if ok && (len(gotos) == 1 && target.dead || target.short) {
numReplaced := 0
for _, g := range gotos {
code := edit.TextAt(target.comment, target.start) + target.code
if !objsMatch(pkg, fn, g.Pos(), target.objs, target.start, target.end) {
if debug {
println("OBJS DO NOT MATCH")
}
// Cannot inline code here; needed identifiers have different meanings.
continue
}
if target.needReturn {
// NOTE: Should really check to see if function results are shadowed.
// If we screw up, the code won't compile, so we can put it off.
code += "; return"
}
if target.needGoto != "" {
code += "; goto " + target.needGoto
}
edit.Replace(g.Pos(), g.End(), code)
numReplaced++
}
if numReplaced == len(gotos) {
if len(gotos) == 1 && target.dead {
edit.Delete(target.comment, target.end)
} else {
edit.DeleteLine(target.start, target.endLabel)
}
}
// The code we move might itself have gotos to inline,
// and we can't make that change until we get new line
// number position, so return after each label change.
if numReplaced > 0 {
return
}
}
}
}
func grindFunc(ctxt *grinder.Context, pkg *grinder.Package, edit *grinder.EditBuffer, fn *ast.FuncDecl) {
vars := analyzeFunc(pkg, edit, fn.Body)
// fmt.Printf("%s", vardecl.PrintVars(conf.Fset, vars))
for _, v := range vars {
spec := v.Decl.Decl.(*ast.GenDecl).Specs[0].(*ast.ValueSpec)
if len(spec.Names) > 1 {
// TODO: Handle decls with multiple variables
continue
}
if pkg.FileSet.Position(v.Decl.Pos()).Line != pkg.FileSet.Position(v.Decl.End()).Line {
// Declaration spans line. Maybe not great to move or duplicate?
continue
}
keepDecl := false
for _, d := range v.Defs {
if d.Init == v.Decl {
keepDecl = true
continue
}
switch x := d.Init.(type) {
default:
panic("unexpected init")
case *ast.EmptyStmt:
edit.CopyLine(v.Decl.Pos(), v.Decl.End(), x.Semicolon)
case *ast.AssignStmt:
edit.Insert(x.TokPos, ":")
if !hasType(pkg, fn, edit, x.Rhs[0], x.Lhs[0]) {
typ := edit.TextAt(spec.Type.Pos(), spec.Type.End())
if strings.Contains(typ, " ") || typ == "interface{}" || typ == "struct{}" || strings.HasPrefix(typ, "*") {
typ = "(" + typ + ")"
}
edit.Insert(x.Rhs[0].Pos(), typ+"(")
edit.Insert(x.Rhs[0].End(), ")")
}
}
}
if !keepDecl {
edit.DeleteLine(v.Decl.Pos(), v.Decl.End())
}
}
if edit.NumEdits() == 0 {
initToDecl(ctxt, pkg, edit, fn)
}
}