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convert.go
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package cxgo
import (
"fmt"
"strings"
"modernc.org/cc/v3"
"modernc.org/token"
"github.com/gotranspile/cxgo/types"
)
func (g *translator) newIdent(name string, t types.Type) *types.Ident {
if id, ok := g.env.IdentByName(name); ok {
if it := id.CType(nil); it.Kind().Major() == t.Kind().Major() || (it.Kind().IsBool() && t.Kind().IsInt()) {
return id // FIXME: this is invalid, we should consult scopes instead
}
}
return types.NewIdent(name, t)
}
func (g *translator) convMacro(name string, fnc func() Expr) Expr {
if g.env.ForceMacro(name) {
return fnc()
}
id, ok := g.macros[name]
if ok {
return IdentExpr{id}
}
x := fnc()
typ := x.CType(nil)
id = g.newIdent(name, typ)
g.macros[name] = id
return IdentExpr{id}
}
func (g *translator) convertIdent(scope cc.Scope, tok cc.Token, t types.Type) IdentExpr {
var decl []cc.Node
for len(scope) != 0 {
if nodes, ok := scope[tok.Value]; ok {
decl = nodes
break
}
scope = scope.Parent()
}
if len(decl) == 0 {
panic(fmt.Errorf("unresolved identifier: %s (%s)", tok, tok.Position()))
}
return g.convertIdentWith(tok.String(), t, decl...)
}
func (g *translator) convertIdentWith(name string, t types.Type, decls ...cc.Node) IdentExpr {
for _, d := range decls {
if id, ok := g.decls[d]; ok && id.Name == name {
return IdentExpr{id}
}
}
id := g.newIdent(name, t)
if to, ok := g.idents[name]; ok && to.Rename != "" {
id.GoName = to.Rename
}
for _, d := range decls {
g.decls[d] = id
}
return IdentExpr{id}
}
func (g *translator) replaceIdentWith(id *types.Ident, decls ...cc.Node) {
for _, d := range decls {
g.decls[d] = id
}
}
func (g *translator) tryConvertIdentOn(t types.Type, tok cc.Token) (*types.Ident, bool) {
loop:
for {
switch s := t.(type) {
case types.PtrType:
t = s.Elem()
case types.ArrayType:
t = s.Elem()
case types.Named:
t = s.Underlying()
default:
break loop
}
}
switch t := t.(type) {
case *types.StructType:
name := tok.Value.String()
for _, f := range t.Fields() {
if name == f.Name.Name {
return f.Name, true
}
if f.Name.Name == "" {
if id, ok := g.tryConvertIdentOn(f.Type(), tok); ok {
return id, true
}
}
}
}
return nil, false
}
func (g *translator) convertIdentOn(t types.Type, tok cc.Token) *types.Ident {
id, ok := g.tryConvertIdentOn(t, tok)
if ok {
return id
}
panic(fmt.Errorf("%#v.%q (%s)", t, tok.Value.String(), tok.Position()))
}
func (g *translator) convertFuncDef(d *cc.FunctionDefinition) []CDecl {
decl := d.Declarator
switch dd := decl.DirectDeclarator; dd.Case {
case cc.DirectDeclaratorFuncParam, cc.DirectDeclaratorFuncIdent:
sname := decl.Name().String()
conf := g.idents[sname]
ft := g.convertFuncType(conf, decl, decl.Type(), decl.Position())
if !g.inCurFile(d) {
return nil
}
name := g.convertIdentWith(sname, ft, decl)
return []CDecl{
&CFuncDecl{
Name: name.Ident,
Type: ft,
Body: g.convertCompBlockStmt(d.CompoundStatement).In(ft),
Range: &Range{
Start: d.Position().Offset,
StartLine: d.Position().Line,
},
},
}
default:
panic(dd.Case.String() + " " + dd.Position().String())
}
}
type positioner interface {
Position() token.Position
}
func (g *translator) inCurFile(p positioner) bool {
name := strings.TrimLeft(p.Position().Filename, "./")
if g.cur == name {
return true
}
base, ok := strings.CutSuffix(g.cur, ".c")
if !ok {
return false
}
return base+".h" == name
}
func (g *translator) convertInitList(typ types.Type, list *cc.InitializerList) Expr {
var items []*CompLitField
var (
prev int64 = -1 // previous array init index
pi int64 = 0 // relative index added to the last seen item; see below
)
for it := list; it != nil; it = it.InitializerList {
val := g.convertInitExpr(it.Initializer)
var f *CompLitField
if it.Designation == nil {
// no index in the initializer - assign automatically
pi++
f = &CompLitField{Index: cIntLit(prev+pi, 10), Value: val}
items = append(items, f)
continue
}
f = g.convertOneDesignator(typ, it.Designation.DesignatorList, val)
if lit, ok := f.Index.(IntLit); ok {
if prev == -1 {
// first item - note that we started initializing indexes
prev = 0
} else if prev == lit.Int() {
// this was an old bug in CC where it returned stale indexes
// for items without any index designators
// it looks like it is fixed now, but we keep the workaround just in case
pi++
f.Index = cIntLit(prev+pi, 10)
} else {
// valid index - set previous and reset relative index
prev = lit.Int()
pi = 0
}
}
items = append(items, f)
}
return g.NewCCompLitExpr(
typ,
items,
)
}
func (g *translator) convertInitExpr(d *cc.Initializer) Expr {
switch d.Case {
case cc.InitializerExpr:
return g.convertAssignExpr(d.AssignmentExpression)
case cc.InitializerInitList:
return g.convertInitList(
g.convertTypeRoot(IdentConfig{}, d.Type(), d.Position()),
d.InitializerList,
)
default:
panic(d.Case.String() + " " + d.Position().String())
}
}
func (g *translator) convertEnum(b *cc.Declaration, typ types.Type, d *cc.EnumSpecifier) []CDecl {
if d.EnumeratorList == nil {
return nil
}
implicitType := false
if typ == nil {
implicitType = true
typ = types.UntypedIntT(g.env.IntSize())
}
vd := &CVarDecl{
Const: true,
Single: false,
CVarSpec: CVarSpec{g: g, Type: typ},
}
var (
autos = 0 // number of implicit inits
values = 0 // number of explicit inits
)
for it := d.EnumeratorList; it != nil; it = it.EnumeratorList {
e := it.Enumerator
if e.Case == cc.EnumeratorExpr {
init := g.convertConstExpr(e.ConstantExpression)
vd.Inits = append(vd.Inits, init)
values++
if l, ok := cUnwrap(init).(IntLit); ok {
if implicitType && l.IsNegative() {
typ = types.AsSignedIntT(types.UntypedIntT(g.env.IntSize()))
vd.Type = typ
}
}
continue
}
vd.Inits = append(vd.Inits, nil)
autos++
}
if autos == 1 && vd.Inits[0] == nil {
autos--
values++
vd.Inits[0] = cIntLit(0, 10)
}
// use iota if there is only one explicit init (the first one), or no explicit values are set
isIota := (vd.Inits[0] == nil && autos == 1) || autos == len(vd.Inits)
if len(vd.Inits) > 1 && vd.Inits[0] != nil && values == 1 {
if _, ok := cUnwrap(vd.Inits[0]).(IntLit); ok {
isIota = true
values--
autos++
}
}
if len(vd.Inits) != 0 && isIota && values != 0 {
panic("TODO: mixed enums")
}
var next int64
for it, i := d.EnumeratorList, 0; it != nil; it, i = it.EnumeratorList, i+1 {
e := it.Enumerator
if isIota {
if i == 0 {
iot := g.Iota()
if val := vd.Inits[0]; val != nil {
if l, ok := cUnwrap(val).(IntLit); !ok || !l.IsZero() {
iot = &CBinaryExpr{Left: iot, Op: BinOpAdd, Right: val}
}
}
if !typ.Kind().IsUntypedInt() {
iot = &CCastExpr{Type: typ, Expr: iot}
}
vd.Inits[0] = iot
}
} else {
if vd.Inits[i] == nil {
vd.Inits[i] = cIntLit(next, 10)
next++
} else if l, ok := cUnwrap(vd.Inits[i]).(IntLit); ok {
next = l.Int() + 1
}
}
vd.Names = append(vd.Names, g.convertIdentWith(e.Token.Value.String(), typ, e).Ident)
}
if len(vd.Names) == 0 {
return nil
}
if isIota {
vd.Type = nil
}
return []CDecl{vd}
}
func (g *translator) convertTypedefName(d *cc.Declaration) (cc.Token, *cc.Declarator) {
if d.InitDeclaratorList == nil || d.InitDeclaratorList.InitDeclarator == nil {
panic("no decl")
}
if d.InitDeclaratorList.InitDeclaratorList != nil {
panic("should have one decl")
}
id := d.InitDeclaratorList.InitDeclarator
if id.Case != cc.InitDeclaratorDecl {
panic(id.Case.String())
}
dd := id.Declarator
if dd.DirectDeclarator.Case != cc.DirectDeclaratorIdent {
panic(dd.DirectDeclarator.Case)
}
return dd.DirectDeclarator.Token, dd
}
func (g *translator) convertDecl(d *cc.Declaration) []CDecl {
inCur := g.inCurFile(d)
var (
isConst bool
isVolatile bool
isTypedef bool
isStatic bool
isExtern bool
isForward bool
isFunc bool
isPrim bool
isAuto bool
typeSpec types.Type
enumSpec *cc.EnumSpecifier
names []string // used only for the hooks
)
for il := d.InitDeclaratorList; il != nil; il = il.InitDeclaratorList {
id := il.InitDeclarator
switch id.Case {
case cc.InitDeclaratorDecl, cc.InitDeclaratorInit:
dd := id.Declarator
if name := dd.Name().String(); name != "" {
names = append(names, name)
}
}
}
spec := d.DeclarationSpecifiers
if spec != nil && spec.Case == cc.DeclarationSpecifiersStorage &&
spec.StorageClassSpecifier.Case == cc.StorageClassSpecifierTypedef {
isTypedef = true
spec = spec.DeclarationSpecifiers
}
for sp := spec; sp != nil; sp = sp.DeclarationSpecifiers {
switch sp.Case {
case cc.DeclarationSpecifiersTypeQual:
ds := sp.TypeQualifier
switch ds.Case {
case cc.TypeQualifierConst:
isConst = true
case cc.TypeQualifierVolatile:
isVolatile = true
default:
panic(ds.Case.String())
}
case cc.DeclarationSpecifiersStorage:
ds := sp.StorageClassSpecifier
switch ds.Case {
case cc.StorageClassSpecifierStatic:
isStatic = true
case cc.StorageClassSpecifierExtern:
isExtern = true
case cc.StorageClassSpecifierAuto:
isAuto = true
case cc.StorageClassSpecifierRegister:
// ignore
default:
panic(ds.Case.String())
}
if isTypedef {
panic("wrong type")
}
case cc.DeclarationSpecifiersTypeSpec:
ds := sp.TypeSpecifier
switch ds.Case {
case cc.TypeSpecifierStructOrUnion:
su := ds.StructOrUnionSpecifier
var conf IdentConfig
for _, name := range names {
if c, ok := g.idents[name]; ok {
conf = c
break
}
}
switch su.Case {
case cc.StructOrUnionSpecifierTag:
// struct/union forward declaration
isForward = true
typeSpec = g.convertType(conf, su.Type(), d.Position()).(types.Named)
case cc.StructOrUnionSpecifierDef:
// struct/union declaration
if isForward {
panic("already marked as a forward decl")
}
typeSpec = g.convertType(conf, su.Type(), d.Position())
default:
panic(su.Case.String())
}
case cc.TypeSpecifierEnum:
enumSpec = ds.EnumSpecifier
case cc.TypeSpecifierVoid:
isFunc = true
default:
isPrim = true
}
case cc.DeclarationSpecifiersFunc:
isFunc = true
// TODO: use specifiers
default:
panic(sp.Case.String() + " " + sp.Position().String())
}
}
_ = isStatic // FIXME: static
_ = isVolatile
_ = isAuto // FIXME: auto
var decls []CDecl
if enumSpec != nil {
if isForward {
panic("TODO")
}
if isPrim || isFunc {
panic("wrong type")
}
if typeSpec != nil {
panic("should have no type")
}
if !inCur {
return nil
}
var (
typ types.Type
hasOtherDecls = false
)
if isTypedef {
name, dd := g.convertTypedefName(d)
und := g.convertType(IdentConfig{}, dd.Type(), name.Position())
nt := g.newOrFindNamedType(name.Value.String(), func() types.Type {
return und
})
typ = nt
decls = append(decls, &CTypeDef{nt})
} else if d.InitDeclaratorList != nil {
hasOtherDecls = true
} else if name := enumSpec.Token2; name.Value != 0 {
nt := g.newOrFindNamedType(name.Value.String(), func() types.Type {
return g.env.DefIntT()
})
typ = nt
decls = append(decls, &CTypeDef{nt})
}
if !hasOtherDecls {
decls = append(decls, g.convertEnum(d, typ, enumSpec)...)
}
}
if d.InitDeclaratorList == nil || d.InitDeclaratorList.InitDeclarator == nil {
if typeSpec == nil && enumSpec != nil {
return decls
}
if isTypedef && isForward {
panic("wrong type")
}
if isPrim || isFunc {
panic("wrong type")
}
if isForward {
if typeSpec == nil {
panic("no type for forward decl")
}
if !inCur || !g.conf.ForwardDecl {
return nil
}
} else {
if !inCur {
return nil
}
if isTypedef {
panic("TODO")
}
}
nt, ok := typeSpec.(types.Named)
if !ok {
if isForward {
panic("forward declaration of unnamed type")
} else {
panic(fmt.Errorf("declaration of unnamed type: %T", typeSpec))
}
}
decls = append(decls, &CTypeDef{nt})
return decls
}
var (
added = 0
skipped = 0
)
for il := d.InitDeclaratorList; il != nil; il = il.InitDeclaratorList {
id := il.InitDeclarator
switch id.Case {
case cc.InitDeclaratorDecl, cc.InitDeclaratorInit:
dd := id.Declarator
dname := dd.Name().String()
conf := g.idents[dname]
vt := g.convertTypeRootOpt(conf, dd.Type(), id.Position())
if isTypedef && vt == nil {
vt = types.StructT(nil)
}
var init Expr
if id.Initializer != nil && inCur {
if isTypedef {
panic("init in typedef: " + id.Position().String())
}
init = g.convertInitExpr(id.Initializer)
}
if isConst && propagateConst(vt) {
isConst = false
}
if isTypedef {
if enumSpec != nil {
continue
}
nt, ok := vt.(types.Named)
// TODO: this case is "too smart", we already handle those kind of double typedefs on a lower level
if !ok || nt.Name().Name != dd.Name().String() {
// we don't call a *From version of the method here because dd.Type() is an underlying type,
// not a typedef type
if ok && !strings.HasPrefix(nt.Name().Name, "_cxgo_") {
decls = append(decls, &CTypeDef{nt})
}
if vt == nil {
panic("TODO: typedef of void? " + id.Position().String())
}
nt = g.newOrFindNamedTypedef(dd.Name().String(), func() types.Type {
return vt
})
if nt == nil {
// typedef suppressed
skipped++
continue
}
}
decls = append(decls, &CTypeDef{nt})
continue
}
name := g.convertIdentWith(dd.NameTok().String(), vt, dd)
isDecl := false
for di := dd.DirectDeclarator; di != nil; di = di.DirectDeclarator {
if di.Case == cc.DirectDeclaratorDecl {
isDecl = true
break
}
}
if !isDecl && !isForward {
if nt, ok := typeSpec.(types.Named); ok {
decls = append(decls, &CTypeDef{nt})
}
}
if ft, ok := vt.(*types.FuncType); ok && !isDecl {
// forward declaration
if l, id, ok := g.tenv.LibIdentByName(name.Name); ok && id.CType(nil).Kind().IsFunc() {
// forward declaration of stdlib function
// we must first load the corresponding library to the real env
l, ok = g.env.GetLibrary(l.Name)
if !ok {
panic("cannot load stdlib")
}
id, ok = l.Idents[name.Name]
if !ok {
panic("cannot find stdlib ident")
}
g.replaceIdentWith(id, dd)
skipped++
} else if g.conf.ForwardDecl {
decls = append(decls, &CFuncDecl{
Name: name.Ident,
Type: ft,
Body: nil,
})
} else {
skipped++
}
} else {
decls = decls[:len(decls)-added]
if !isExtern {
var inits []Expr
if init != nil {
inits = []Expr{init}
}
decls = append(decls, &CVarDecl{
// There is no real const in C
Const: false, // Const: isConst,
CVarSpec: CVarSpec{
g: g,
Type: vt,
Names: []*types.Ident{name.Ident},
Inits: inits,
},
})
} else {
skipped++
}
}
default:
panic(id.Case.String())
}
}
if !inCur {
return nil
}
if len(decls) == 0 && skipped == 0 {
panic("no declarations converted: " + d.Position().String())
}
return decls
}
func (g *translator) convertCompStmt(d *cc.CompoundStatement) []CStmt {
var stmts []CStmt
for it := d.BlockItemList; it != nil; it = it.BlockItemList {
st := it.BlockItem
switch st.Case {
case cc.BlockItemDecl:
for _, dec := range g.convertDecl(st.Declaration) {
stmts = append(stmts, g.NewCDeclStmt(dec)...)
}
case cc.BlockItemStmt:
stmts = append(stmts, g.convertStmt(st.Statement)...)
default:
panic(st.Case.String())
}
}
// TODO: shouldn't it return statements without a block? or call an optimizing version of block constructor?
return []CStmt{g.newBlockStmt(stmts...)}
}
func (g *translator) convertCompBlockStmt(d *cc.CompoundStatement) *BlockStmt {
stmts := g.convertCompStmt(d)
if len(stmts) == 1 {
if b, ok := stmts[0].(*BlockStmt); ok {
return b
}
}
// TODO: shouldn't it call a version that applies optimizations?
return g.newBlockStmt(stmts...)
}
func (g *translator) convertExpr(d *cc.Expression) Expr {
if d.Expression == nil {
return g.convertAssignExpr(d.AssignmentExpression)
}
var exprs []*cc.AssignmentExpression
for ; d != nil; d = d.Expression {
exprs = append(exprs, d.AssignmentExpression)
}
var m []Expr
for i := len(exprs) - 1; i >= 0; i-- {
m = append(m, g.convertAssignExpr(exprs[i]))
}
return g.NewCMultiExpr(m...)
}
func (g *translator) convertExprOpt(d *cc.Expression) Expr {
if d == nil {
return nil
}
return g.convertExpr(d)
}
func (g *translator) convertMulExpr(d *cc.MultiplicativeExpression) Expr {
switch d.Case {
case cc.MultiplicativeExpressionCast:
return g.convertCastExpr(d.CastExpression)
}
x := g.convertMulExpr(d.MultiplicativeExpression)
y := g.convertCastExpr(d.CastExpression)
var op BinaryOp
switch d.Case {
case cc.MultiplicativeExpressionMul:
op = BinOpMult
case cc.MultiplicativeExpressionDiv:
op = BinOpDiv
case cc.MultiplicativeExpressionMod:
op = BinOpMod
default:
panic(d.Case.String())
}
return g.NewCBinaryExprT(
x, op, y,
g.convertTypeOper(d.Operand, d.Position()),
)
}
func (g *translator) convertAddExpr(d *cc.AdditiveExpression) Expr {
switch d.Case {
case cc.AdditiveExpressionMul:
return g.convertMulExpr(d.MultiplicativeExpression)
}
x := g.convertAddExpr(d.AdditiveExpression)
y := g.convertMulExpr(d.MultiplicativeExpression)
var op BinaryOp
switch d.Case {
case cc.AdditiveExpressionAdd:
op = BinOpAdd
case cc.AdditiveExpressionSub:
op = BinOpSub
default:
panic(d.Case.String())
}
return g.NewCBinaryExprT(
x, op, y,
g.convertTypeOper(d.Operand, d.Position()),
)
}
func (g *translator) convertShiftExpr(d *cc.ShiftExpression) Expr {
switch d.Case {
case cc.ShiftExpressionAdd:
return g.convertAddExpr(d.AdditiveExpression)
}
x := g.convertShiftExpr(d.ShiftExpression)
y := g.convertAddExpr(d.AdditiveExpression)
var op BinaryOp
switch d.Case {
case cc.ShiftExpressionLsh:
op = BinOpLsh
case cc.ShiftExpressionRsh:
op = BinOpRsh
default:
panic(d.Case.String())
}
return g.NewCBinaryExprT(
x, op, y,
g.convertTypeOper(d.Operand, d.Position()),
)
}
func (g *translator) convertRelExpr(d *cc.RelationalExpression) Expr {
switch d.Case {
case cc.RelationalExpressionShift:
return g.convertShiftExpr(d.ShiftExpression)
}
x := g.convertRelExpr(d.RelationalExpression)
y := g.convertShiftExpr(d.ShiftExpression)
var op ComparisonOp
switch d.Case {
case cc.RelationalExpressionLt:
op = BinOpLt
case cc.RelationalExpressionGt:
op = BinOpGt
case cc.RelationalExpressionLeq:
op = BinOpLte
case cc.RelationalExpressionGeq:
op = BinOpGte
default:
panic(d.Case.String())
}
return g.Compare(x, op, y)
}
func (g *translator) convertEqExpr(d *cc.EqualityExpression) Expr {
switch d.Case {
case cc.EqualityExpressionRel:
return g.convertRelExpr(d.RelationalExpression)
}
x := g.convertEqExpr(d.EqualityExpression)
y := g.convertRelExpr(d.RelationalExpression)
var op ComparisonOp
switch d.Case {
case cc.EqualityExpressionEq:
op = BinOpEq
case cc.EqualityExpressionNeq:
op = BinOpNeq
default:
panic(d.Case.String())
}
return g.Compare(x, op, y)
}
func (g *translator) convertAndExpr(d *cc.AndExpression) Expr {
switch d.Case {
case cc.AndExpressionEq:
return g.convertEqExpr(d.EqualityExpression)
case cc.AndExpressionAnd:
x := g.convertAndExpr(d.AndExpression)
y := g.convertEqExpr(d.EqualityExpression)
return g.NewCBinaryExprT(
x, BinOpBitAnd, y,
g.convertTypeOper(d.Operand, d.Position()),
)
default:
panic(d.Case.String())
}
}
func (g *translator) convertLOrExcExpr(d *cc.ExclusiveOrExpression) Expr {
switch d.Case {
case cc.ExclusiveOrExpressionAnd:
return g.convertAndExpr(d.AndExpression)
case cc.ExclusiveOrExpressionXor:
x := g.convertLOrExcExpr(d.ExclusiveOrExpression)
y := g.convertAndExpr(d.AndExpression)
return g.NewCBinaryExprT(
x, BinOpBitXor, y,
g.convertTypeOper(d.Operand, d.Position()),
)
default:
panic(d.Case.String())
}
}
func (g *translator) convertLOrIncExpr(d *cc.InclusiveOrExpression) Expr {
switch d.Case {
case cc.InclusiveOrExpressionXor:
return g.convertLOrExcExpr(d.ExclusiveOrExpression)
case cc.InclusiveOrExpressionOr:
x := g.convertLOrIncExpr(d.InclusiveOrExpression)
y := g.convertLOrExcExpr(d.ExclusiveOrExpression)
return g.NewCBinaryExprT(
x, BinOpBitOr, y,
g.convertTypeOper(d.Operand, d.Position()),
)
default:
panic(d.Case.String())
}
}
func (g *translator) convertLAndExpr(d *cc.LogicalAndExpression) Expr {
switch d.Case {
case cc.LogicalAndExpressionOr:
return g.convertLOrIncExpr(d.InclusiveOrExpression)
case cc.LogicalAndExpressionLAnd:
x := g.convertLAndExpr(d.LogicalAndExpression)
y := g.convertLOrIncExpr(d.InclusiveOrExpression)
return And(g.ToBool(x), g.ToBool(y))
default:
panic(d.Case.String())
}
}
func (g *translator) convertLOrExpr(d *cc.LogicalOrExpression) Expr {
switch d.Case {
case cc.LogicalOrExpressionLAnd:
return g.convertLAndExpr(d.LogicalAndExpression)
case cc.LogicalOrExpressionLOr:
x := g.convertLOrExpr(d.LogicalOrExpression)
y := g.convertLAndExpr(d.LogicalAndExpression)
return Or(g.ToBool(x), g.ToBool(y))
default:
panic(d.Case.String())
}
}
func (g *translator) convertCondExpr(d *cc.ConditionalExpression) Expr {
switch d.Case {
case cc.ConditionalExpressionLOr:
return g.convertLOrExpr(d.LogicalOrExpression)
case cc.ConditionalExpressionCond:
cond := g.convertLOrExpr(d.LogicalOrExpression)
return g.NewCTernaryExpr(
g.ToBool(cond),
g.convertExpr(d.Expression),
g.convertCondExpr(d.ConditionalExpression),
)
default:
panic(d.Case.String())
}
}
func (g *translator) convertPriExpr(d *cc.PrimaryExpression) Expr {
switch d.Case {
case cc.PrimaryExpressionIdent: // x
if d.Token.String() == "asm" {
return &CAsmExpr{e: g.env.Env}
}
if d.Operand == nil {
panic(ErrorfWithPos(d.Position(), "empty operand for %q", d.Token.String()))
}
return g.convertIdent(d.ResolvedIn(), d.Token, g.convertTypeOper(d.Operand, d.Position()))
case cc.PrimaryExpressionEnum: // X
return g.convertIdent(d.ResolvedIn(), d.Token, g.convertTypeOper(d.Operand, d.Position()))
case cc.PrimaryExpressionInt: // 1
fnc := func() Expr {
v, err := parseCIntLit(d.Token.String(), g.conf.IntReformat)
if err != nil {
panic(err)
}
return v
}
if m := d.Token.Macro(); m != 0 {
return g.convMacro(m.String(), fnc)
}
return fnc()
case cc.PrimaryExpressionFloat: // 0.0
fnc := func() Expr {
v, err := parseCFloatLit(d.Token.String())
if err != nil {
panic(err)
}
if d.Operand == nil {
return v
}
return g.cCast(
g.convertTypeOper(d.Operand, d.Position()),
v,
)
}
if m := d.Token.Macro(); m != 0 {
return g.convMacro(m.String(), fnc)
}
return fnc()
case cc.PrimaryExpressionChar: // 'x'
fnc := func() Expr {
return cLitT(
d.Token.String(), CLitChar,
g.convertTypeOper(d.Operand, d.Position()),
)
}
if m := d.Token.Macro(); m != 0 {
return g.convMacro(m.String(), fnc)
}
return fnc()
case cc.PrimaryExpressionLChar: // 'x'
fnc := func() Expr {
return cLitT(
d.Token.String(), CLitWChar,
g.convertTypeOper(d.Operand, d.Position()),
)
}
if m := d.Token.Macro(); m != 0 {
return g.convMacro(m.String(), fnc)
}
return fnc()
case cc.PrimaryExpressionString: // "x"
fnc := func() Expr {
v, err := g.parseCStringLit(d.Token.String())
if err != nil {
panic(err)
}
return v
}
if m := d.Token.Macro(); m != 0 {
return g.convMacro(m.String(), fnc)
}
return fnc()
case cc.PrimaryExpressionLString: // L"x"
fnc := func() Expr {
v, err := g.parseCWStringLit(d.Token.String())
if err != nil {
panic(err)
}
return v
}
if m := d.Token.Macro(); m != 0 {
return g.convMacro(m.String(), fnc)
}
return fnc()
case cc.PrimaryExpressionExpr: // "(x)"
e := g.convertExpr(d.Expression)
return cParen(e)
case cc.PrimaryExpressionStmt: // "({...; x})"
stmt := g.convertCompStmt(d.CompoundStatement)
if len(stmt) != 1 {
panic("TODO")
}
stmt = stmt[0].(*BlockStmt).Stmts
last, ok := stmt[len(stmt)-1].(*CExprStmt)
if !ok {
// let it cause a compilation error in Go
return &CallExpr{
Fun: g.NewFuncLit(g.env.FuncTT(g.env.DefIntT()), stmt...),
}
}
typ := last.Expr.CType(nil)
stmt = append(stmt[:len(stmt)-1], g.NewReturnStmt(last.Expr, typ)...)
return &CallExpr{
Fun: g.NewFuncLit(g.env.FuncTT(typ), stmt...),
}
default:
panic(fmt.Errorf("%v (%v)", d.Case, d.Position()))
}
}
func (g *translator) convertOneDesignator(typ types.Type, list *cc.DesignatorList, val Expr) *CompLitField {
d := list.Designator
var (
f *CompLitField
sub types.Type
)
switch d.Case {
case cc.DesignatorIndex:
f = &CompLitField{Index: g.convertConstExpr(d.ConstantExpression)}
sub = typ.(types.ArrayType).Elem()
case cc.DesignatorField:
f = &CompLitField{Field: g.convertIdentOn(typ, d.Token2)}
sub = f.Field.CType(nil)
case cc.DesignatorField2:
f = &CompLitField{Field: g.convertIdentOn(typ, d.Token)}