// insertInWithin places before/after advice around a statement
func (wb *WithinBlock) insertInWithin(a ast.Stmt, w *Weave) string {
rout := ""
mName := grabMethodName(a)
// begin line
begin := wb.fset.Position(a.Pos()).Line - 1
after := wb.fset.Position(a.End()).Line + 1
// until this is refactored - any lines we add in our
// advice need to be accounted for w/begin
before_advice := formatAdvice(wb.aspect.advize.before, mName)
after_advice := formatAdvice(wb.aspect.advize.after, mName)
if before_advice != "" {
rout = w.writeAtLine(wb.fname, begin+wb.linecnt, before_advice)
wb.linecnt += strings.Count(before_advice, "\n") + 1
}
if after_advice != "" {
rout = w.writeAtLine(wb.fname, after+wb.linecnt-1, after_advice)
wb.linecnt += strings.Count(after_advice, "\n") + 1
}
for t := 0; t < len(wb.aspect.importz); t++ {
wb.importsNeeded = append(wb.importsNeeded, wb.aspect.importz[t])
}
return rout
}
// statementBoundary finds the location in s that terminates the current basic
// block in the source.
func (f *File) statementBoundary(s ast.Stmt) token.Pos {
// Control flow statements are easy.
switch s := s.(type) {
case *ast.BlockStmt:
// Treat blocks like basic blocks to avoid overlapping counters.
return s.Lbrace
case *ast.IfStmt:
return s.Body.Lbrace
case *ast.ForStmt:
return s.Body.Lbrace
case *ast.LabeledStmt:
return f.statementBoundary(s.Stmt)
case *ast.RangeStmt:
return s.Body.Lbrace
case *ast.SwitchStmt:
return s.Body.Lbrace
case *ast.SelectStmt:
return s.Body.Lbrace
case *ast.TypeSwitchStmt:
return s.Body.Lbrace
}
// If not a control flow statement, it is a declaration, expression, call, etc. and it may have a function literal.
// If it does, that's tricky because we want to exclude the body of the function from this block.
// Draw a line at the start of the body of the first function literal we find.
// TODO: what if there's more than one? Probably doesn't matter much.
var literal funcLitFinder
ast.Walk(&literal, s)
if literal.found() {
return token.Pos(literal)
}
return s.End()
}
func emitTraceStmt(f *Function, event TraceEvent, syntax ast.Stmt) Value {
t := &Trace{
Event: event,
Start: syntax.Pos(),
End: syntax.End(),
Breakpoint: false,
syntax: syntax,
}
return emitTraceCommon(f, t)
}
func (p *parser) makeExpr(s ast.Stmt) ast.Expr {
if s == nil {
return nil
}
if es, isExpr := s.(*ast.ExprStmt); isExpr {
return p.checkExpr(es.X)
}
p.error(s.Pos(), "expected condition, found simple statement")
return &ast.BadExpr{s.Pos(), s.End()}
}
func (v *ShortError) VisitStmt(scope *ast.Scope, stmt ast.Stmt) ScopeVisitor {
v.stmt = stmt
switch stmt := stmt.(type) {
case *ast.BlockStmt:
return &ShortError{v.file, v.patches, v.stmt, stmt, 0, new([]byte)}
case *ast.ExprStmt:
if call := calltomust(stmt.X); call != nil {
// TODO(elazarl): depends on number of variables it returns, currently we assume one
pos := v.file.Fset.Position(stmt.Pos())
fmt.Printf("%s:%d:%d: 'must' builtin must be assigned into variable\n",
pos.Filename, pos.Line, pos.Column)
}
case *ast.AssignStmt:
if len(stmt.Rhs) != 1 {
return v
}
if rhs, ok := stmt.Rhs[0].(*ast.CallExpr); ok {
if fun, ok := rhs.Fun.(*ast.Ident); ok && fun.Name == MustKeyword {
if stmt.Tok == token.DEFINE {
tmpVar := v.tempVar("assignerr_", scope)
*v.patches = append(*v.patches,
patch.Insert(stmt.TokPos, ", "+tmpVar+" "),
patch.Replace(fun, ""),
patch.Insert(stmt.End(),
"; if "+tmpVar+" != nil "+
"{ panic("+tmpVar+") };"),
)
for _, arg := range rhs.Args {
v.VisitExpr(scope, arg)
}
return nil
} else if stmt.Tok == token.ASSIGN {
vars := []string{}
for i := 0; i < len(stmt.Lhs); i++ {
vars = append(vars, v.tempVar(fmt.Sprint("assgn", i, "_"), scope))
}
assgnerr := v.tempVar("assgnErr_", scope)
*v.patches = append(*v.patches,
patch.Insert(stmt.Pos(),
strings.Join(append(vars, assgnerr), ", ")+":="),
patch.InsertNode(stmt.Pos(), rhs.Args[0]),
patch.Insert(stmt.Pos(),
"; if "+assgnerr+" != nil "+
"{ panic("+assgnerr+") };"),
patch.Replace(rhs, strings.Join(vars, ", ")),
)
v.VisitExpr(scope, rhs.Args[0])
return nil
}
}
}
}
return v
}
// statementBoundary finds the location in s that terminates the current basic
// block in the source.
func (f *File) statementBoundary(s ast.Stmt) token.Pos {
// Control flow statements are easy.
switch s := s.(type) {
case *ast.BlockStmt:
// Treat blocks like basic blocks to avoid overlapping counters.
return s.Lbrace
case *ast.IfStmt:
return s.Body.Lbrace
case *ast.ForStmt:
return s.Body.Lbrace
case *ast.LabeledStmt:
return f.statementBoundary(s.Stmt)
case *ast.RangeStmt:
// Ranges might loop over things with function literals.: for _ = range []func(){ ... } {.
// TODO: There are a few other such possibilities, but they're extremely unlikely.
found, pos := hasFuncLiteral(s.X)
if found {
return pos
}
return s.Body.Lbrace
case *ast.SwitchStmt:
return s.Body.Lbrace
case *ast.SelectStmt:
return s.Body.Lbrace
case *ast.TypeSwitchStmt:
return s.Body.Lbrace
}
// If not a control flow statement, it is a declaration, expression, call, etc. and it may have a function literal.
// If it does, that's tricky because we want to exclude the body of the function from this block.
// Draw a line at the start of the body of the first function literal we find.
// TODO: what if there's more than one? Probably doesn't matter much.
found, pos := hasFuncLiteral(s)
if found {
return pos
}
return s.End()
}
// stmt typechecks statement s.
func (check *Checker) stmt(ctxt stmtContext, s ast.Stmt) {
// statements cannot use iota in general
// (constant declarations set it explicitly)
assert(check.iota == nil)
// statements must end with the same top scope as they started with
if debug {
defer func(scope *Scope) {
// don't check if code is panicking
if p := recover(); p != nil {
panic(p)
}
assert(scope == check.scope)
}(check.scope)
}
inner := ctxt &^ fallthroughOk
switch s := s.(type) {
case *ast.BadStmt, *ast.EmptyStmt:
// ignore
case *ast.DeclStmt:
check.declStmt(s.Decl)
case *ast.LabeledStmt:
check.hasLabel = true
check.stmt(ctxt, s.Stmt)
case *ast.ExprStmt:
// spec: "With the exception of specific built-in functions,
// function and method calls and receive operations can appear
// in statement context. Such statements may be parenthesized."
var x operand
kind := check.rawExpr(&x, s.X, nil)
var msg string
switch x.mode {
default:
if kind == statement {
return
}
msg = "is not used"
case builtin:
msg = "must be called"
case typexpr:
msg = "is not an expression"
}
check.errorf(x.pos(), "%s %s", &x, msg)
case *ast.SendStmt:
var ch, x operand
check.expr(&ch, s.Chan)
check.expr(&x, s.Value)
if ch.mode == invalid || x.mode == invalid {
return
}
tch, ok := ch.typ.Underlying().(*Chan)
if !ok {
check.invalidOp(s.Arrow, "cannot send to non-chan type %s", ch.typ)
return
}
if tch.dir == RecvOnly {
check.invalidOp(s.Arrow, "cannot send to receive-only type %s", tch)
return
}
check.assignment(&x, tch.elem, "send")
case *ast.IncDecStmt:
var op token.Token
switch s.Tok {
case token.INC:
op = token.ADD
case token.DEC:
op = token.SUB
default:
check.invalidAST(s.TokPos, "unknown inc/dec operation %s", s.Tok)
return
}
var x operand
check.expr(&x, s.X)
if x.mode == invalid {
return
}
if !isNumeric(x.typ) {
check.invalidOp(s.X.Pos(), "%s%s (non-numeric type %s)", s.X, s.Tok, x.typ)
return
}
Y := &ast.BasicLit{ValuePos: s.X.Pos(), Kind: token.INT, Value: "1"} // use x's position
check.binary(&x, nil, s.X, Y, op)
if x.mode == invalid {
return
}
check.assignVar(s.X, &x)
case *ast.AssignStmt:
switch s.Tok {
case token.ASSIGN, token.DEFINE:
if len(s.Lhs) == 0 {
check.invalidAST(s.Pos(), "missing lhs in assignment")
return
}
if s.Tok == token.DEFINE {
check.shortVarDecl(s.TokPos, s.Lhs, s.Rhs)
} else {
// regular assignment
check.assignVars(s.Lhs, s.Rhs)
}
default:
// assignment operations
if len(s.Lhs) != 1 || len(s.Rhs) != 1 {
check.errorf(s.TokPos, "assignment operation %s requires single-valued expressions", s.Tok)
return
}
op := assignOp(s.Tok)
if op == token.ILLEGAL {
check.invalidAST(s.TokPos, "unknown assignment operation %s", s.Tok)
return
}
var x operand
check.binary(&x, nil, s.Lhs[0], s.Rhs[0], op)
if x.mode == invalid {
return
}
check.assignVar(s.Lhs[0], &x)
}
case *ast.GoStmt:
check.suspendedCall("go", s.Call)
case *ast.DeferStmt:
check.suspendedCall("defer", s.Call)
case *ast.ReturnStmt:
res := check.sig.results
if res.Len() > 0 {
// function returns results
// (if one, say the first, result parameter is named, all of them are named)
if len(s.Results) == 0 && res.vars[0].name != "" {
// spec: "Implementation restriction: A compiler may disallow an empty expression
// list in a "return" statement if a different entity (constant, type, or variable)
// with the same name as a result parameter is in scope at the place of the return."
for _, obj := range res.vars {
if _, alt := check.scope.LookupParent(obj.name, check.pos); alt != nil && alt != obj {
check.errorf(s.Pos(), "result parameter %s not in scope at return", obj.name)
check.errorf(alt.Pos(), "\tinner declaration of %s", obj)
// ok to continue
}
}
} else {
// return has results or result parameters are unnamed
check.initVars(res.vars, s.Results, s.Return)
}
} else if len(s.Results) > 0 {
check.error(s.Results[0].Pos(), "no result values expected")
check.use(s.Results...)
}
case *ast.BranchStmt:
if s.Label != nil {
check.hasLabel = true
return // checked in 2nd pass (check.labels)
}
switch s.Tok {
case token.BREAK:
if ctxt&breakOk == 0 {
check.error(s.Pos(), "break not in for, switch, or select statement")
}
case token.CONTINUE:
if ctxt&continueOk == 0 {
check.error(s.Pos(), "continue not in for statement")
}
case token.FALLTHROUGH:
if ctxt&fallthroughOk == 0 {
check.error(s.Pos(), "fallthrough statement out of place")
}
default:
check.invalidAST(s.Pos(), "branch statement: %s", s.Tok)
}
case *ast.BlockStmt:
check.openScope(s, "block")
defer check.closeScope()
check.stmtList(inner, s.List)
case *ast.IfStmt:
check.openScope(s, "if")
defer check.closeScope()
check.simpleStmt(s.Init)
var x operand
check.expr(&x, s.Cond)
if x.mode != invalid && !isBoolean(x.typ) {
check.error(s.Cond.Pos(), "non-boolean condition in if statement")
}
check.stmt(inner, s.Body)
// The parser produces a correct AST but if it was modified
// elsewhere the else branch may be invalid. Check again.
switch s.Else.(type) {
case nil, *ast.BadStmt:
// valid or error already reported
case *ast.IfStmt, *ast.BlockStmt:
check.stmt(inner, s.Else)
default:
check.error(s.Else.Pos(), "invalid else branch in if statement")
}
case *ast.SwitchStmt:
inner |= breakOk
check.openScope(s, "switch")
defer check.closeScope()
check.simpleStmt(s.Init)
var x operand
if s.Tag != nil {
check.expr(&x, s.Tag)
// By checking assignment of x to an invisible temporary
// (as a compiler would), we get all the relevant checks.
check.assignment(&x, nil, "switch expression")
} else {
// spec: "A missing switch expression is
// equivalent to the boolean value true."
x.mode = constant_
x.typ = Typ[Bool]
x.val = constant.MakeBool(true)
x.expr = &ast.Ident{NamePos: s.Body.Lbrace, Name: "true"}
}
check.multipleDefaults(s.Body.List)
seen := make(valueMap) // map of seen case values to positions and types
for i, c := range s.Body.List {
clause, _ := c.(*ast.CaseClause)
if clause == nil {
check.invalidAST(c.Pos(), "incorrect expression switch case")
continue
}
check.caseValues(&x, clause.List, seen)
check.openScope(clause, "case")
inner := inner
if i+1 < len(s.Body.List) {
inner |= fallthroughOk
}
check.stmtList(inner, clause.Body)
check.closeScope()
}
case *ast.TypeSwitchStmt:
inner |= breakOk
check.openScope(s, "type switch")
defer check.closeScope()
check.simpleStmt(s.Init)
// A type switch guard must be of the form:
//
// TypeSwitchGuard = [ identifier ":=" ] PrimaryExpr "." "(" "type" ")" .
//
// The parser is checking syntactic correctness;
// remaining syntactic errors are considered AST errors here.
// TODO(gri) better factoring of error handling (invalid ASTs)
//
var lhs *ast.Ident // lhs identifier or nil
var rhs ast.Expr
switch guard := s.Assign.(type) {
case *ast.ExprStmt:
rhs = guard.X
case *ast.AssignStmt:
if len(guard.Lhs) != 1 || guard.Tok != token.DEFINE || len(guard.Rhs) != 1 {
check.invalidAST(s.Pos(), "incorrect form of type switch guard")
return
}
lhs, _ = guard.Lhs[0].(*ast.Ident)
if lhs == nil {
check.invalidAST(s.Pos(), "incorrect form of type switch guard")
return
}
if lhs.Name == "_" {
// _ := x.(type) is an invalid short variable declaration
check.softErrorf(lhs.Pos(), "no new variable on left side of :=")
lhs = nil // avoid declared but not used error below
} else {
check.recordDef(lhs, nil) // lhs variable is implicitly declared in each cause clause
}
rhs = guard.Rhs[0]
default:
check.invalidAST(s.Pos(), "incorrect form of type switch guard")
return
}
// rhs must be of the form: expr.(type) and expr must be an interface
expr, _ := rhs.(*ast.TypeAssertExpr)
if expr == nil || expr.Type != nil {
check.invalidAST(s.Pos(), "incorrect form of type switch guard")
return
}
var x operand
check.expr(&x, expr.X)
if x.mode == invalid {
return
}
xtyp, _ := x.typ.Underlying().(*Interface)
if xtyp == nil {
check.errorf(x.pos(), "%s is not an interface", &x)
return
}
check.multipleDefaults(s.Body.List)
var lhsVars []*Var // list of implicitly declared lhs variables
seen := make(map[Type]token.Pos) // map of seen types to positions
for _, s := range s.Body.List {
clause, _ := s.(*ast.CaseClause)
if clause == nil {
check.invalidAST(s.Pos(), "incorrect type switch case")
continue
}
// Check each type in this type switch case.
T := check.caseTypes(&x, xtyp, clause.List, seen)
check.openScope(clause, "case")
// If lhs exists, declare a corresponding variable in the case-local scope.
if lhs != nil {
// spec: "The TypeSwitchGuard may include a short variable declaration.
// When that form is used, the variable is declared at the beginning of
// the implicit block in each clause. In clauses with a case listing
// exactly one type, the variable has that type; otherwise, the variable
// has the type of the expression in the TypeSwitchGuard."
if len(clause.List) != 1 || T == nil {
T = x.typ
}
obj := NewVar(lhs.Pos(), check.pkg, lhs.Name, T)
scopePos := clause.End()
if len(clause.Body) > 0 {
scopePos = clause.Body[0].Pos()
}
check.declare(check.scope, nil, obj, scopePos)
check.recordImplicit(clause, obj)
// For the "declared but not used" error, all lhs variables act as
// one; i.e., if any one of them is 'used', all of them are 'used'.
// Collect them for later analysis.
lhsVars = append(lhsVars, obj)
}
check.stmtList(inner, clause.Body)
check.closeScope()
}
// If lhs exists, we must have at least one lhs variable that was used.
if lhs != nil {
var used bool
for _, v := range lhsVars {
if v.used {
used = true
}
v.used = true // avoid usage error when checking entire function
}
if !used {
check.softErrorf(lhs.Pos(), "%s declared but not used", lhs.Name)
}
}
case *ast.SelectStmt:
inner |= breakOk
check.multipleDefaults(s.Body.List)
for _, s := range s.Body.List {
clause, _ := s.(*ast.CommClause)
if clause == nil {
continue // error reported before
}
// clause.Comm must be a SendStmt, RecvStmt, or default case
valid := false
var rhs ast.Expr // rhs of RecvStmt, or nil
switch s := clause.Comm.(type) {
case nil, *ast.SendStmt:
valid = true
case *ast.AssignStmt:
if len(s.Rhs) == 1 {
rhs = s.Rhs[0]
}
case *ast.ExprStmt:
rhs = s.X
}
// if present, rhs must be a receive operation
if rhs != nil {
if x, _ := unparen(rhs).(*ast.UnaryExpr); x != nil && x.Op == token.ARROW {
valid = true
}
}
if !valid {
check.error(clause.Comm.Pos(), "select case must be send or receive (possibly with assignment)")
continue
}
check.openScope(s, "case")
if clause.Comm != nil {
check.stmt(inner, clause.Comm)
}
check.stmtList(inner, clause.Body)
check.closeScope()
}
case *ast.ForStmt:
inner |= breakOk | continueOk
check.openScope(s, "for")
defer check.closeScope()
check.simpleStmt(s.Init)
if s.Cond != nil {
var x operand
check.expr(&x, s.Cond)
if x.mode != invalid && !isBoolean(x.typ) {
check.error(s.Cond.Pos(), "non-boolean condition in for statement")
}
}
check.simpleStmt(s.Post)
// spec: "The init statement may be a short variable
// declaration, but the post statement must not."
if s, _ := s.Post.(*ast.AssignStmt); s != nil && s.Tok == token.DEFINE {
check.softErrorf(s.Pos(), "cannot declare in post statement")
check.use(s.Lhs...) // avoid follow-up errors
}
check.stmt(inner, s.Body)
case *ast.RangeStmt:
inner |= breakOk | continueOk
check.openScope(s, "for")
defer check.closeScope()
// check expression to iterate over
var x operand
check.expr(&x, s.X)
// determine key/value types
var key, val Type
if x.mode != invalid {
switch typ := x.typ.Underlying().(type) {
case *Basic:
if isString(typ) {
key = Typ[Int]
val = universeRune // use 'rune' name
}
case *Array:
key = Typ[Int]
val = typ.elem
case *Slice:
key = Typ[Int]
val = typ.elem
case *Pointer:
if typ, _ := typ.base.Underlying().(*Array); typ != nil {
key = Typ[Int]
val = typ.elem
}
case *Map:
key = typ.key
val = typ.elem
case *Chan:
key = typ.elem
val = Typ[Invalid]
if typ.dir == SendOnly {
check.errorf(x.pos(), "cannot range over send-only channel %s", &x)
// ok to continue
}
if s.Value != nil {
check.errorf(s.Value.Pos(), "iteration over %s permits only one iteration variable", &x)
// ok to continue
}
}
}
if key == nil {
check.errorf(x.pos(), "cannot range over %s", &x)
// ok to continue
}
// check assignment to/declaration of iteration variables
// (irregular assignment, cannot easily map to existing assignment checks)
// lhs expressions and initialization value (rhs) types
lhs := [2]ast.Expr{s.Key, s.Value}
rhs := [2]Type{key, val} // key, val may be nil
if s.Tok == token.DEFINE {
// short variable declaration; variable scope starts after the range clause
// (the for loop opens a new scope, so variables on the lhs never redeclare
// previously declared variables)
var vars []*Var
for i, lhs := range lhs {
if lhs == nil {
continue
}
// determine lhs variable
var obj *Var
if ident, _ := lhs.(*ast.Ident); ident != nil {
// declare new variable
name := ident.Name
obj = NewVar(ident.Pos(), check.pkg, name, nil)
check.recordDef(ident, obj)
// _ variables don't count as new variables
if name != "_" {
vars = append(vars, obj)
}
} else {
check.errorf(lhs.Pos(), "cannot declare %s", lhs)
obj = NewVar(lhs.Pos(), check.pkg, "_", nil) // dummy variable
}
// initialize lhs variable
if typ := rhs[i]; typ != nil {
x.mode = value
x.expr = lhs // we don't have a better rhs expression to use here
x.typ = typ
check.initVar(obj, &x, "range clause")
} else {
obj.typ = Typ[Invalid]
obj.used = true // don't complain about unused variable
}
}
// declare variables
if len(vars) > 0 {
for _, obj := range vars {
// spec: "The scope of a constant or variable identifier declared inside
// a function begins at the end of the ConstSpec or VarSpec (ShortVarDecl
// for short variable declarations) and ends at the end of the innermost
// containing block."
scopePos := s.End()
check.declare(check.scope, nil /* recordDef already called */, obj, scopePos)
}
} else {
check.error(s.TokPos, "no new variables on left side of :=")
}
} else {
// ordinary assignment
for i, lhs := range lhs {
if lhs == nil {
continue
}
if typ := rhs[i]; typ != nil {
x.mode = value
x.expr = lhs // we don't have a better rhs expression to use here
x.typ = typ
check.assignVar(lhs, &x)
}
}
}
check.stmt(inner, s.Body)
default:
check.error(s.Pos(), "invalid statement")
}
}
func (check *Checker) openScope(s ast.Stmt, comment string) {
scope := NewScope(check.scope, s.Pos(), s.End(), comment)
check.recordScope(s, scope)
check.scope = scope
}
func (v *stmtVisitor) VisitStmt(s ast.Stmt) {
var statements *[]ast.Stmt
switch s := s.(type) {
case *ast.BlockStmt:
statements = &s.List
case *ast.CaseClause:
statements = &s.Body
case *ast.CommClause:
statements = &s.Body
case *ast.ForStmt:
if s.Init != nil {
v.VisitStmt(s.Init)
}
if s.Post != nil {
v.VisitStmt(s.Post)
}
v.VisitStmt(s.Body)
case *ast.IfStmt:
if s.Init != nil {
v.VisitStmt(s.Init)
}
v.VisitStmt(s.Body)
if s.Else != nil {
v.VisitStmt(s.Else)
}
case *ast.LabeledStmt:
v.VisitStmt(s.Stmt)
case *ast.RangeStmt:
v.VisitStmt(s.Body)
case *ast.SelectStmt:
v.VisitStmt(s.Body)
case *ast.SwitchStmt:
if s.Init != nil {
v.VisitStmt(s.Init)
}
v.VisitStmt(s.Body)
case *ast.TypeSwitchStmt:
if s.Init != nil {
v.VisitStmt(s.Init)
}
v.VisitStmt(s.Assign)
v.VisitStmt(s.Body)
}
if statements == nil {
return
}
for i := 0; i < len(*statements); i++ {
s := (*statements)[i]
switch s.(type) {
case *ast.CaseClause, *ast.CommClause, *ast.BlockStmt:
break
default:
start, end := v.fset.Position(s.Pos()), v.fset.Position(s.End())
stmtObj := v.functions[len(v.functions)-1].RegisterStatement(start.Offset, end.Offset)
expr := makeCall(fmt.Sprint(stmtObj, ".At"))
stmt := &ast.ExprStmt{X: expr}
item := []ast.Stmt{stmt}
*statements = append((*statements)[:i], append(item, (*statements)[i:]...)...)
i++
}
v.VisitStmt(s)
}
}
func (f *File) statementBoundary(s ast.Stmt) token.Pos {
// Control flow statements are easy.
switch s := s.(type) {
case *ast.BlockStmt:
// Treat blocks like basic blocks to avoid overlapping counters.
return s.Lbrace
case *ast.IfStmt:
found, pos := hasFuncLiteral(s.Init)
if found {
return pos
}
found, pos = hasFuncLiteral(s.Cond)
if found {
return pos
}
return s.Body.Lbrace
case *ast.ForStmt:
found, pos := hasFuncLiteral(s.Init)
if found {
return pos
}
found, pos = hasFuncLiteral(s.Cond)
if found {
return pos
}
found, pos = hasFuncLiteral(s.Post)
if found {
return pos
}
return s.Body.Lbrace
case *ast.LabeledStmt:
return f.statementBoundary(s.Stmt)
case *ast.RangeStmt:
found, pos := hasFuncLiteral(s.X)
if found {
return pos
}
return s.Body.Lbrace
case *ast.SwitchStmt:
found, pos := hasFuncLiteral(s.Init)
if found {
return pos
}
found, pos = hasFuncLiteral(s.Tag)
if found {
return pos
}
return s.Body.Lbrace
case *ast.SelectStmt:
return s.Body.Lbrace
case *ast.TypeSwitchStmt:
found, pos := hasFuncLiteral(s.Init)
if found {
return pos
}
return s.Body.Lbrace
}
found, pos := hasFuncLiteral(s)
if found {
return pos
}
return s.End()
}
func (v *StmtVisitor) VisitStmt(s ast.Stmt) {
var statements *[]ast.Stmt
switch s := s.(type) {
case *ast.BlockStmt:
statements = &s.List
case *ast.CaseClause:
statements = &s.Body
case *ast.CommClause:
statements = &s.Body
case *ast.ForStmt:
if s.Init != nil {
v.VisitStmt(s.Init)
}
if s.Post != nil {
v.VisitStmt(s.Post)
}
v.VisitStmt(s.Body)
case *ast.IfStmt:
if s.Init != nil {
v.VisitStmt(s.Init)
}
v.VisitStmt(s.Body)
if s.Else != nil {
// Code copied from go.tools/cmd/cover, to deal with "if x {} else if y {}"
const backupToElse = token.Pos(len("else ")) // The AST doesn't remember the else location. We can make an accurate guess.
switch stmt := s.Else.(type) {
case *ast.IfStmt:
block := &ast.BlockStmt{
Lbrace: stmt.If - backupToElse, // So the covered part looks like it starts at the "else".
List: []ast.Stmt{stmt},
Rbrace: stmt.End(),
}
s.Else = block
case *ast.BlockStmt:
stmt.Lbrace -= backupToElse // So the block looks like it starts at the "else".
default:
panic("unexpected node type in if")
}
v.VisitStmt(s.Else)
}
case *ast.LabeledStmt:
v.VisitStmt(s.Stmt)
case *ast.RangeStmt:
v.VisitStmt(s.Body)
case *ast.SelectStmt:
v.VisitStmt(s.Body)
case *ast.SwitchStmt:
if s.Init != nil {
v.VisitStmt(s.Init)
}
v.VisitStmt(s.Body)
case *ast.TypeSwitchStmt:
if s.Init != nil {
v.VisitStmt(s.Init)
}
v.VisitStmt(s.Assign)
v.VisitStmt(s.Body)
}
if statements == nil {
return
}
for i := 0; i < len(*statements); i++ {
s := (*statements)[i]
switch s.(type) {
case *ast.CaseClause, *ast.CommClause, *ast.BlockStmt:
break
default:
start, end := v.fset.Position(s.Pos()), v.fset.Position(s.End())
se := &StmtExtent{
startOffset: start.Offset,
startLine: start.Line,
startCol: start.Column,
endOffset: end.Offset,
endLine: end.Line,
endCol: end.Column,
}
v.function.stmts = append(v.function.stmts, se)
}
v.VisitStmt(s)
}
}