func (r *renamer) checkLabel(label *types.Label) {
// Check there are no identical labels in the function's label block.
// (Label blocks don't nest, so this is easy.)
if prev := label.Parent().Lookup(r.to); prev != nil {
r.errorf(label.Pos(), "renaming this label %q to %q", label.Name(), prev.Name())
r.errorf(prev.Pos(), "\twould conflict with this one")
}
}
func (c *funcContext) translateLoopingStmt(cond func() string, body *ast.BlockStmt, bodyPrefix, post func(), label *types.Label, flatten bool) {
prevFlowData := c.flowDatas[nil]
data := &flowData{
postStmt: post,
}
if flatten {
data.beginCase = c.caseCounter
data.endCase = c.caseCounter + 1
c.caseCounter += 2
}
c.flowDatas[nil] = data
c.flowDatas[label] = data
defer func() {
delete(c.flowDatas, label)
c.flowDatas[nil] = prevFlowData
}()
if !flatten && label != nil {
c.Printf("%s:", label.Name())
}
c.PrintCond(!flatten, "while (true) {", fmt.Sprintf("case %d:", data.beginCase))
c.Indent(func() {
condStr := cond()
if condStr != "true" {
c.PrintCond(!flatten, fmt.Sprintf("if (!(%s)) { break; }", condStr), fmt.Sprintf("if(!(%s)) { $s = %d; continue; }", condStr, data.endCase))
}
prevEV := c.p.escapingVars
c.handleEscapingVars(body)
if bodyPrefix != nil {
bodyPrefix()
}
c.translateStmtList(body.List)
isTerminated := false
if len(body.List) != 0 {
switch body.List[len(body.List)-1].(type) {
case *ast.ReturnStmt, *ast.BranchStmt:
isTerminated = true
}
}
if !isTerminated {
post()
}
c.p.escapingVars = prevEV
})
c.PrintCond(!flatten, "}", fmt.Sprintf("$s = %d; continue; case %d:", data.beginCase, data.endCase))
}
func (c *funcContext) translateBranchingStmt(caseClauses []*ast.CaseClause, defaultClause *ast.CaseClause, canBreak bool, translateCond func(ast.Expr) *expression, label *types.Label, flatten bool) {
var caseOffset, defaultCase, endCase int
if flatten {
caseOffset = c.caseCounter
defaultCase = caseOffset + len(caseClauses)
endCase = defaultCase
if defaultClause != nil {
endCase++
}
c.caseCounter = endCase + 1
}
hasBreak := false
if canBreak {
prevFlowData := c.flowDatas[nil]
data := &flowData{
postStmt: prevFlowData.postStmt, // for "continue" of outer loop
beginCase: prevFlowData.beginCase, // same
endCase: endCase,
}
c.flowDatas[nil] = data
c.flowDatas[label] = data
defer func() {
delete(c.flowDatas, label)
c.flowDatas[nil] = prevFlowData
}()
for _, child := range caseClauses {
if analysis.HasBreak(child) {
hasBreak = true
break
}
}
if defaultClause != nil && analysis.HasBreak(defaultClause) {
hasBreak = true
}
}
if label != nil && !flatten {
c.Printf("%s:", label.Name())
}
condStrs := make([]string, len(caseClauses))
for i, clause := range caseClauses {
conds := make([]string, len(clause.List))
for j, cond := range clause.List {
conds[j] = translateCond(cond).String()
}
condStrs[i] = strings.Join(conds, " || ")
if flatten {
c.Printf("/* */ if (%s) { $s = %d; continue; }", condStrs[i], caseOffset+i)
}
}
if flatten {
c.Printf("/* */ $s = %d; continue;", defaultCase)
}
prefix := ""
suffix := ""
if label != nil || hasBreak {
prefix = "switch (0) { default: "
suffix = " }"
}
for i, clause := range caseClauses {
c.SetPos(clause.Pos())
c.PrintCond(!flatten, fmt.Sprintf("%sif (%s) {", prefix, condStrs[i]), fmt.Sprintf("case %d:", caseOffset+i))
c.Indent(func() {
c.translateStmtList(clause.Body)
if flatten && (i < len(caseClauses)-1 || defaultClause != nil) && !endsWithReturn(clause.Body) {
c.Printf("$s = %d; continue;", endCase)
}
})
prefix = "} else "
}
if defaultClause != nil {
c.PrintCond(!flatten, prefix+"{", fmt.Sprintf("case %d:", caseOffset+len(caseClauses)))
c.Indent(func() {
c.translateStmtList(defaultClause.Body)
})
}
c.PrintCond(!flatten, "}"+suffix, fmt.Sprintf("case %d:", endCase))
}
func (c *funcContext) translateStmt(stmt ast.Stmt, label *types.Label) {
c.SetPos(stmt.Pos())
stmt = filter.IncDecStmt(stmt, c.p.Info.Info)
stmt = filter.Assign(stmt, c.p.Info.Info, c.p.Info.Pkg)
switch s := stmt.(type) {
case *ast.BlockStmt:
c.translateStmtList(s.List)
case *ast.IfStmt:
var caseClauses []*ast.CaseClause
ifStmt := s
for {
if ifStmt.Init != nil {
panic("simplification error")
}
caseClauses = append(caseClauses, &ast.CaseClause{List: []ast.Expr{ifStmt.Cond}, Body: ifStmt.Body.List})
elseStmt, ok := ifStmt.Else.(*ast.IfStmt)
if !ok {
break
}
ifStmt = elseStmt
}
var defaultClause *ast.CaseClause
if block, ok := ifStmt.Else.(*ast.BlockStmt); ok {
defaultClause = &ast.CaseClause{Body: block.List}
}
c.translateBranchingStmt(caseClauses, defaultClause, false, c.translateExpr, nil, c.Flattened[s])
case *ast.SwitchStmt:
if s.Init != nil || s.Tag != nil || len(s.Body.List) != 1 {
panic("simplification error")
}
clause := s.Body.List[0].(*ast.CaseClause)
if len(clause.List) != 0 {
panic("simplification error")
}
prevFlowData := c.flowDatas[nil]
data := &flowData{
postStmt: prevFlowData.postStmt, // for "continue" of outer loop
beginCase: prevFlowData.beginCase, // same
}
c.flowDatas[nil] = data
c.flowDatas[label] = data
defer func() {
delete(c.flowDatas, label)
c.flowDatas[nil] = prevFlowData
}()
if c.Flattened[s] {
data.endCase = c.caseCounter
c.caseCounter++
c.Indent(func() {
c.translateStmtList(clause.Body)
})
c.Printf("case %d:", data.endCase)
return
}
if label != nil || analysis.HasBreak(clause) {
if label != nil {
c.Printf("%s:", label.Name())
}
c.Printf("switch (0) { default:")
c.Indent(func() {
c.translateStmtList(clause.Body)
})
c.Printf("}")
return
}
c.translateStmtList(clause.Body)
case *ast.TypeSwitchStmt:
if s.Init != nil {
c.translateStmt(s.Init, nil)
}
refVar := c.newVariable("_ref")
var expr ast.Expr
switch a := s.Assign.(type) {
case *ast.AssignStmt:
expr = a.Rhs[0].(*ast.TypeAssertExpr).X
case *ast.ExprStmt:
expr = a.X.(*ast.TypeAssertExpr).X
}
c.Printf("%s = %s;", refVar, c.translateExpr(expr))
translateCond := func(cond ast.Expr) *expression {
if types.Identical(c.p.TypeOf(cond), types.Typ[types.UntypedNil]) {
return c.formatExpr("%s === $ifaceNil", refVar)
}
return c.formatExpr("$assertType(%s, %s, true)[1]", refVar, c.typeName(c.p.TypeOf(cond)))
}
var caseClauses []*ast.CaseClause
var defaultClause *ast.CaseClause
for _, cc := range s.Body.List {
clause := cc.(*ast.CaseClause)
var bodyPrefix []ast.Stmt
if implicit := c.p.Implicits[clause]; implicit != nil {
value := refVar
if _, isInterface := implicit.Type().Underlying().(*types.Interface); !isInterface {
value += ".$val"
}
bodyPrefix = []ast.Stmt{&ast.AssignStmt{
Lhs: []ast.Expr{c.newIdent(c.objectName(implicit), implicit.Type())},
Tok: token.DEFINE,
Rhs: []ast.Expr{c.newIdent(value, implicit.Type())},
}}
}
c := &ast.CaseClause{
List: clause.List,
Body: append(bodyPrefix, clause.Body...),
}
if len(c.List) == 0 {
defaultClause = c
continue
}
caseClauses = append(caseClauses, c)
}
c.translateBranchingStmt(caseClauses, defaultClause, true, translateCond, label, c.Flattened[s])
case *ast.ForStmt:
if s.Init != nil {
c.translateStmt(s.Init, nil)
}
cond := func() string {
if s.Cond == nil {
return "true"
}
return c.translateExpr(s.Cond).String()
}
c.translateLoopingStmt(cond, s.Body, nil, func() {
if s.Post != nil {
c.translateStmt(s.Post, nil)
}
}, label, c.Flattened[s])
case *ast.RangeStmt:
refVar := c.newVariable("_ref")
c.Printf("%s = %s;", refVar, c.translateExpr(s.X))
switch t := c.p.TypeOf(s.X).Underlying().(type) {
case *types.Basic:
iVar := c.newVariable("_i")
c.Printf("%s = 0;", iVar)
runeVar := c.newVariable("_rune")
c.translateLoopingStmt(func() string { return iVar + " < " + refVar + ".length" }, s.Body, func() {
c.Printf("%s = $decodeRune(%s, %s);", runeVar, refVar, iVar)
if !isBlank(s.Key) {
c.Printf("%s", c.translateAssign(s.Key, c.newIdent(iVar, types.Typ[types.Int]), s.Tok == token.DEFINE))
}
if !isBlank(s.Value) {
c.Printf("%s", c.translateAssign(s.Value, c.newIdent(runeVar+"[0]", types.Typ[types.Rune]), s.Tok == token.DEFINE))
}
}, func() {
c.Printf("%s += %s[1];", iVar, runeVar)
}, label, c.Flattened[s])
case *types.Map:
iVar := c.newVariable("_i")
c.Printf("%s = 0;", iVar)
keysVar := c.newVariable("_keys")
c.Printf("%s = $keys(%s);", keysVar, refVar)
c.translateLoopingStmt(func() string { return iVar + " < " + keysVar + ".length" }, s.Body, func() {
entryVar := c.newVariable("_entry")
c.Printf("%s = %s[%s[%s]];", entryVar, refVar, keysVar, iVar)
c.translateStmt(&ast.IfStmt{
Cond: c.newIdent(entryVar+" === undefined", types.Typ[types.Bool]),
Body: &ast.BlockStmt{List: []ast.Stmt{&ast.BranchStmt{Tok: token.CONTINUE}}},
}, nil)
if !isBlank(s.Key) {
c.Printf("%s", c.translateAssign(s.Key, c.newIdent(entryVar+".k", t.Key()), s.Tok == token.DEFINE))
}
if !isBlank(s.Value) {
c.Printf("%s", c.translateAssign(s.Value, c.newIdent(entryVar+".v", t.Elem()), s.Tok == token.DEFINE))
}
}, func() {
c.Printf("%s++;", iVar)
}, label, c.Flattened[s])
case *types.Array, *types.Pointer, *types.Slice:
var length string
var elemType types.Type
switch t2 := t.(type) {
case *types.Array:
length = fmt.Sprintf("%d", t2.Len())
elemType = t2.Elem()
case *types.Pointer:
length = fmt.Sprintf("%d", t2.Elem().Underlying().(*types.Array).Len())
elemType = t2.Elem().Underlying().(*types.Array).Elem()
case *types.Slice:
length = refVar + ".$length"
elemType = t2.Elem()
}
iVar := c.newVariable("_i")
c.Printf("%s = 0;", iVar)
c.translateLoopingStmt(func() string { return iVar + " < " + length }, s.Body, func() {
if !isBlank(s.Key) {
c.Printf("%s", c.translateAssign(s.Key, c.newIdent(iVar, types.Typ[types.Int]), s.Tok == token.DEFINE))
}
if !isBlank(s.Value) {
c.Printf("%s", c.translateAssign(s.Value, c.setType(&ast.IndexExpr{
X: c.newIdent(refVar, t),
Index: c.newIdent(iVar, types.Typ[types.Int]),
}, elemType), s.Tok == token.DEFINE))
}
}, func() {
c.Printf("%s++;", iVar)
}, label, c.Flattened[s])
case *types.Chan:
okVar := c.newIdent(c.newVariable("_ok"), types.Typ[types.Bool])
key := s.Key
tok := s.Tok
if key == nil {
key = ast.NewIdent("_")
tok = token.ASSIGN
}
forStmt := &ast.ForStmt{
Body: &ast.BlockStmt{
List: []ast.Stmt{
&ast.AssignStmt{
Lhs: []ast.Expr{
key,
okVar,
},
Rhs: []ast.Expr{
c.setType(&ast.UnaryExpr{X: c.newIdent(refVar, t), Op: token.ARROW}, types.NewTuple(types.NewVar(0, nil, "", t.Elem()), types.NewVar(0, nil, "", types.Typ[types.Bool]))),
},
Tok: tok,
},
&ast.IfStmt{
Cond: &ast.UnaryExpr{X: okVar, Op: token.NOT},
Body: &ast.BlockStmt{List: []ast.Stmt{&ast.BranchStmt{Tok: token.BREAK}}},
},
s.Body,
},
},
}
c.Flattened[forStmt] = true
c.translateStmt(forStmt, label)
default:
panic("")
}
case *ast.BranchStmt:
normalLabel := ""
blockingLabel := ""
data := c.flowDatas[nil]
if s.Label != nil {
normalLabel = " " + s.Label.Name
blockingLabel = " s" // use explicit label "s", because surrounding loop may not be flattened
data = c.flowDatas[c.p.Uses[s.Label].(*types.Label)]
}
switch s.Tok {
case token.BREAK:
c.PrintCond(data.endCase == 0, fmt.Sprintf("break%s;", normalLabel), fmt.Sprintf("$s = %d; continue%s;", data.endCase, blockingLabel))
case token.CONTINUE:
data.postStmt()
c.PrintCond(data.beginCase == 0, fmt.Sprintf("continue%s;", normalLabel), fmt.Sprintf("$s = %d; continue%s;", data.beginCase, blockingLabel))
case token.GOTO:
c.PrintCond(false, "goto "+s.Label.Name, fmt.Sprintf("$s = %d; continue;", c.labelCase(c.p.Uses[s.Label].(*types.Label))))
case token.FALLTHROUGH:
// handled in CaseClause
default:
panic("Unhandled branch statment: " + s.Tok.String())
}
case *ast.ReturnStmt:
results := s.Results
if c.resultNames != nil {
if len(s.Results) != 0 {
c.translateStmt(&ast.AssignStmt{
Lhs: c.resultNames,
Tok: token.ASSIGN,
Rhs: s.Results,
}, nil)
}
results = c.resultNames
}
rVal := c.translateResults(results)
if c.Flattened[s] {
resumeCase := c.caseCounter
c.caseCounter++
c.Printf("/* */ $s = %[1]d; case %[1]d:", resumeCase)
}
c.Printf("return%s;", rVal)
case *ast.DeferStmt:
isBuiltin := false
isJs := false
switch fun := s.Call.Fun.(type) {
case *ast.Ident:
var builtin *types.Builtin
builtin, isBuiltin = c.p.Uses[fun].(*types.Builtin)
if isBuiltin && builtin.Name() == "recover" {
c.Printf("$deferred.push([$recover, []]);")
return
}
case *ast.SelectorExpr:
isJs = typesutil.IsJsPackage(c.p.Uses[fun.Sel].Pkg())
}
sig := c.p.TypeOf(s.Call.Fun).Underlying().(*types.Signature)
args := c.translateArgs(sig, s.Call.Args, s.Call.Ellipsis.IsValid(), true)
if isBuiltin || isJs {
vars := make([]string, len(s.Call.Args))
callArgs := make([]ast.Expr, len(s.Call.Args))
for i, arg := range s.Call.Args {
v := c.newVariable("_arg")
vars[i] = v
callArgs[i] = c.newIdent(v, c.p.TypeOf(arg))
}
call := c.translateExpr(&ast.CallExpr{
Fun: s.Call.Fun,
Args: callArgs,
Ellipsis: s.Call.Ellipsis,
})
c.Printf("$deferred.push([function(%s) { %s; }, [%s]]);", strings.Join(vars, ", "), call, strings.Join(args, ", "))
return
}
c.Printf("$deferred.push([%s, [%s]]);", c.translateExpr(s.Call.Fun), strings.Join(args, ", "))
case *ast.AssignStmt:
if s.Tok != token.ASSIGN && s.Tok != token.DEFINE {
panic(s.Tok)
}
switch {
case len(s.Lhs) == 1 && len(s.Rhs) == 1:
lhs := astutil.RemoveParens(s.Lhs[0])
if isBlank(lhs) {
if analysis.HasSideEffect(s.Rhs[0], c.p.Info.Info) {
c.Printf("%s;", c.translateExpr(s.Rhs[0]))
}
return
}
c.Printf("%s", c.translateAssign(lhs, s.Rhs[0], s.Tok == token.DEFINE))
case len(s.Lhs) > 1 && len(s.Rhs) == 1:
tupleVar := c.newVariable("_tuple")
c.Printf("%s = %s;", tupleVar, c.translateExpr(s.Rhs[0]))
tuple := c.p.TypeOf(s.Rhs[0]).(*types.Tuple)
for i, lhs := range s.Lhs {
lhs = astutil.RemoveParens(lhs)
if !isBlank(lhs) {
c.Printf("%s", c.translateAssign(lhs, c.newIdent(fmt.Sprintf("%s[%d]", tupleVar, i), tuple.At(i).Type()), s.Tok == token.DEFINE))
}
}
case len(s.Lhs) == len(s.Rhs):
tmpVars := make([]string, len(s.Rhs))
for i, rhs := range s.Rhs {
tmpVars[i] = c.newVariable("_tmp")
if isBlank(astutil.RemoveParens(s.Lhs[i])) {
if analysis.HasSideEffect(rhs, c.p.Info.Info) {
c.Printf("%s;", c.translateExpr(rhs))
}
continue
}
c.Printf("%s", c.translateAssign(c.newIdent(tmpVars[i], c.p.TypeOf(s.Lhs[i])), rhs, true))
}
for i, lhs := range s.Lhs {
lhs = astutil.RemoveParens(lhs)
if !isBlank(lhs) {
c.Printf("%s", c.translateAssign(lhs, c.newIdent(tmpVars[i], c.p.TypeOf(lhs)), s.Tok == token.DEFINE))
}
}
default:
panic("Invalid arity of AssignStmt.")
}
case *ast.DeclStmt:
decl := s.Decl.(*ast.GenDecl)
switch decl.Tok {
case token.VAR:
for _, spec := range s.Decl.(*ast.GenDecl).Specs {
valueSpec := spec.(*ast.ValueSpec)
lhs := make([]ast.Expr, len(valueSpec.Names))
for i, name := range valueSpec.Names {
lhs[i] = name
}
rhs := valueSpec.Values
if len(rhs) == 0 {
rhs = make([]ast.Expr, len(lhs))
for i, e := range lhs {
rhs[i] = c.zeroValue(c.p.TypeOf(e))
}
}
c.translateStmt(&ast.AssignStmt{
Lhs: lhs,
Tok: token.DEFINE,
Rhs: rhs,
}, nil)
}
case token.TYPE:
for _, spec := range decl.Specs {
o := c.p.Defs[spec.(*ast.TypeSpec).Name].(*types.TypeName)
c.p.typeNames = append(c.p.typeNames, o)
c.p.objectNames[o] = c.newVariableWithLevel(o.Name(), true)
c.p.dependencies[o] = true
}
case token.CONST:
// skip, constants are inlined
}
case *ast.ExprStmt:
expr := c.translateExpr(s.X)
if expr != nil && expr.String() != "" {
c.Printf("%s;", expr)
}
case *ast.LabeledStmt:
label := c.p.Defs[s.Label].(*types.Label)
if c.GotoLabel[label] {
c.PrintCond(false, s.Label.Name+":", fmt.Sprintf("case %d:", c.labelCase(label)))
}
c.translateStmt(s.Stmt, label)
case *ast.GoStmt:
c.Printf("$go(%s, [%s]);", c.translateExpr(s.Call.Fun), strings.Join(c.translateArgs(c.p.TypeOf(s.Call.Fun).Underlying().(*types.Signature), s.Call.Args, s.Call.Ellipsis.IsValid(), true), ", "))
case *ast.SendStmt:
chanType := c.p.TypeOf(s.Chan).Underlying().(*types.Chan)
call := &ast.CallExpr{
Fun: c.newIdent("$send", types.NewSignature(nil, types.NewTuple(types.NewVar(0, nil, "", chanType), types.NewVar(0, nil, "", chanType.Elem())), nil, false)),
Args: []ast.Expr{s.Chan, c.newIdent(c.translateImplicitConversionWithCloning(s.Value, chanType.Elem()).String(), chanType.Elem())},
}
c.Blocking[call] = true
c.translateStmt(&ast.ExprStmt{X: call}, label)
case *ast.SelectStmt:
selectionVar := c.newVariable("_selection")
var channels []string
var caseClauses []*ast.CaseClause
flattened := false
hasDefault := false
for i, cc := range s.Body.List {
clause := cc.(*ast.CommClause)
switch comm := clause.Comm.(type) {
case nil:
channels = append(channels, "[]")
hasDefault = true
case *ast.ExprStmt:
channels = append(channels, c.formatExpr("[%e]", astutil.RemoveParens(comm.X).(*ast.UnaryExpr).X).String())
case *ast.AssignStmt:
channels = append(channels, c.formatExpr("[%e]", astutil.RemoveParens(comm.Rhs[0]).(*ast.UnaryExpr).X).String())
case *ast.SendStmt:
chanType := c.p.TypeOf(comm.Chan).Underlying().(*types.Chan)
channels = append(channels, c.formatExpr("[%e, %s]", comm.Chan, c.translateImplicitConversionWithCloning(comm.Value, chanType.Elem())).String())
default:
panic(fmt.Sprintf("unhandled: %T", comm))
}
indexLit := &ast.BasicLit{Kind: token.INT}
c.p.Types[indexLit] = types.TypeAndValue{Type: types.Typ[types.Int], Value: constant.MakeInt64(int64(i))}
var bodyPrefix []ast.Stmt
if assign, ok := clause.Comm.(*ast.AssignStmt); ok {
switch rhsType := c.p.TypeOf(assign.Rhs[0]).(type) {
case *types.Tuple:
bodyPrefix = []ast.Stmt{&ast.AssignStmt{Lhs: assign.Lhs, Rhs: []ast.Expr{c.newIdent(selectionVar+"[1]", rhsType)}, Tok: assign.Tok}}
default:
bodyPrefix = []ast.Stmt{&ast.AssignStmt{Lhs: assign.Lhs, Rhs: []ast.Expr{c.newIdent(selectionVar+"[1][0]", rhsType)}, Tok: assign.Tok}}
}
}
caseClauses = append(caseClauses, &ast.CaseClause{
List: []ast.Expr{indexLit},
Body: append(bodyPrefix, clause.Body...),
})
flattened = flattened || c.Flattened[clause]
}
selectCall := c.setType(&ast.CallExpr{
Fun: c.newIdent("$select", types.NewSignature(nil, types.NewTuple(types.NewVar(0, nil, "", types.NewInterface(nil, nil))), types.NewTuple(types.NewVar(0, nil, "", types.Typ[types.Int])), false)),
Args: []ast.Expr{c.newIdent(fmt.Sprintf("[%s]", strings.Join(channels, ", ")), types.NewInterface(nil, nil))},
}, types.Typ[types.Int])
c.Blocking[selectCall] = !hasDefault
c.Printf("%s = %s;", selectionVar, c.translateExpr(selectCall))
if len(caseClauses) != 0 {
translateCond := func(cond ast.Expr) *expression {
return c.formatExpr("%s[0] === %e", selectionVar, cond)
}
c.translateBranchingStmt(caseClauses, nil, true, translateCond, label, flattened)
}
case *ast.EmptyStmt:
// skip
default:
panic(fmt.Sprintf("Unhandled statement: %T\n", s))
}
}
func (c *funcContext) translateBranchingStmt(caseClauses []ast.Stmt, isSwitch bool, translateCond func(ast.Expr) *expression, printCaseBodyPrefix func(int), label *types.Label, flatten bool) {
var branches []*branch
var defaultBranch *branch
var openBranches []*branch
clauseLoop:
for i, cc := range caseClauses {
clause := cc.(*ast.CaseClause)
branch := &branch{index: i, clause: clause}
openBranches = append(openBranches, branch)
for _, openBranch := range openBranches {
openBranch.body = append(openBranch.body, clause.Body...)
}
if !hasFallthrough(clause) {
openBranches = nil
}
if len(clause.List) == 0 {
defaultBranch = branch
continue
}
for _, cond := range clause.List {
if translateCond == nil {
if b, ok := analysis.BoolValue(cond, c.p.Info.Info); ok {
if b {
defaultBranch = branch
break clauseLoop
}
continue
}
}
branch.conds = append(branch.conds, cond)
}
if len(branch.conds) == 0 {
continue
}
branches = append(branches, branch)
}
for defaultBranch == nil && len(branches) != 0 && len(branches[len(branches)-1].body) == 0 && printCaseBodyPrefix == nil {
branches = branches[:len(branches)-1]
}
if len(branches) == 0 {
if defaultBranch != nil {
c.translateStmtList(defaultBranch.body)
return
}
return
}
hasBreak := false
if isSwitch {
switch label {
case nil:
for _, child := range caseClauses {
if analysis.HasBreak(child) {
hasBreak = true
break
}
}
default:
hasBreak = true // always assume break if label is given
}
}
var caseOffset, endCase int
if flatten {
caseOffset = c.caseCounter
endCase = caseOffset + len(branches)
if defaultBranch != nil {
endCase++
}
c.caseCounter = endCase + 1
}
if isSwitch {
prevFlowData := c.flowDatas[nil]
data := &flowData{
postStmt: prevFlowData.postStmt, // for "continue" of outer loop
beginCase: prevFlowData.beginCase, // same
endCase: endCase,
}
c.flowDatas[nil] = data
c.flowDatas[label] = data
defer func() {
delete(c.flowDatas, label)
c.flowDatas[nil] = prevFlowData
}()
}
if isSwitch && !flatten && label != nil {
c.Printf("%s:", label.Name())
}
prefix := ""
if hasBreak {
prefix = "switch (0) { default: "
}
for i, b := range branches {
conds := make([]string, len(b.conds))
for i, cond := range b.conds {
if translateCond == nil {
conds[i] = c.translateExpr(cond).String()
continue
}
conds[i] = translateCond(cond).String()
}
b.condStr = strings.Join(conds, " || ")
if flatten {
c.Printf("/* */ if (%s) { $s = %d; continue; }", b.condStr, caseOffset+i)
}
}
if flatten {
c.Printf("/* */ $s = %d; continue;", caseOffset+len(branches))
}
for i, b := range branches {
c.SetPos(b.clause.Pos())
c.PrintCond(!flatten, fmt.Sprintf("%sif (%s) {", prefix, b.condStr), fmt.Sprintf("case %d:", caseOffset+i))
c.Indent(func() {
if printCaseBodyPrefix != nil {
printCaseBodyPrefix(b.index)
}
c.translateStmtList(b.body)
if flatten && (defaultBranch != nil || i != len(branches)-1) && !endsWithReturn(b.body) {
c.Printf("$s = %d; continue;", endCase)
}
})
prefix = "} else "
}
if defaultBranch != nil {
c.PrintCond(!flatten, "} else {", fmt.Sprintf("case %d:", caseOffset+len(branches)))
c.Indent(func() {
if printCaseBodyPrefix != nil {
printCaseBodyPrefix(defaultBranch.index)
}
c.translateStmtList(defaultBranch.body)
})
}
if hasBreak {
c.PrintCond(!flatten, "} }", fmt.Sprintf("case %d:", endCase))
return
}
c.PrintCond(!flatten, "}", fmt.Sprintf("case %d:", endCase))
}