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 initToDecl(ctxt *grinder.Context, pkg *grinder.Package, edit *grinder.EditBuffer, fn *ast.FuncDecl) {
// Rewrite x := T{} (for struct or array type T) and x := (*T)(nil) to var x T.
ast.Inspect(fn.Body, func(x ast.Node) bool {
list := grinder.BlockList(x)
for _, stmt := range list {
as, ok := stmt.(*ast.AssignStmt)
if !ok || len(as.Lhs) > 1 || as.Tok != token.DEFINE {
continue
}
var typ string
if t, ok := isNilPtr(pkg, edit, as.Rhs[0]); ok {
typ = t
} else if t, ok := isStructOrArrayLiteral(pkg, edit, as.Rhs[0]); ok {
typ = t
}
if typ != "" {
edit.Replace(stmt.Pos(), stmt.End(), "var "+as.Lhs[0].(*ast.Ident).Name+" "+typ)
}
}
return true
})
}