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expr.go
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expr.go
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/*
* Copyright (c) 2021 The GoPlus Authors (goplus.org). All rights reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cl
import (
"bytes"
goast "go/ast"
gotoken "go/token"
"go/types"
"log"
"math/big"
"reflect"
"strconv"
"strings"
"github.com/goplus/gop/ast"
"github.com/goplus/gop/cl/internal/typesutil"
"github.com/goplus/gop/printer"
"github.com/goplus/gop/token"
"github.com/goplus/gox"
"github.com/goplus/gox/cpackages"
)
/*-----------------------------------------------------------------------------
Name context:
- varVal (ident)
- varRef = expr (identLHS)
- pkgRef.member (selectorExpr)
- pkgRef.member = expr (selectorExprLHS)
- pkgRef.fn(args) (callExpr)
- fn(args) (callExpr)
- spx.fn(args) (callExpr)
- this.member (classMember)
- this.method(args) (classMember)
Name lookup:
- local variables
- $recv members (only in class files)
- package globals (variables, constants, types, imported packages etc.)
- $spx package exports (only in class files)
- $universe package exports (including builtins)
// ---------------------------------------------------------------------------*/
const (
clIdentCanAutoCall = 1 << iota
clIdentAllowBuiltin
clIdentLHS
clIdentSelectorExpr // this ident is X of ast.SelectorExpr
clIdentGoto
clCallWithTwoValue
clCommandWithoutArgs
)
const (
objNormal = iota
objPkgRef
objCPkgRef
)
const errorPkgPath = "github.com/qiniu/x/errors"
func compileIdent(ctx *blockCtx, ident *ast.Ident, flags int) (pkg *gox.PkgRef, kind int) {
fvalue := (flags&clIdentSelectorExpr) != 0 || (flags&clIdentLHS) == 0
name := ident.Name
if name == "_" {
if fvalue {
panic(ctx.newCodeError(ident.Pos(), "cannot use _ as value"))
}
ctx.cb.VarRef(nil)
return
}
var oldo types.Object
scope := ctx.pkg.Types.Scope()
at, o := ctx.cb.Scope().LookupParent(name, token.NoPos)
if o != nil {
if at != scope && at != types.Universe { // local object
goto find
}
}
if ctx.isClass { // in a Go+ class file
if fn := ctx.cb.Func(); fn != nil {
sig := fn.Ancestor().Type().(*types.Signature)
if recv := sig.Recv(); recv != nil {
ctx.cb.Val(recv)
chkFlag := flags &^ clCommandWithoutArgs
if chkFlag&clIdentSelectorExpr != 0 {
chkFlag = clIdentCanAutoCall
}
if compileMember(ctx, ident, name, chkFlag) == nil { // class member object
return
}
ctx.cb.InternalStack().PopN(1)
}
}
}
// global object
if ctx.loadSymbol(name) {
o, at = scope.Lookup(name), scope
}
if o != nil && at != types.Universe {
goto find
}
// pkgRef object
if (flags & clIdentSelectorExpr) != 0 {
if name == "C" && len(ctx.clookups) > 0 {
return nil, objCPkgRef
}
if pi, ok := ctx.findImport(name); ok {
if rec := ctx.recorder(); rec != nil {
rec.Use(ident, pi.pkgName)
}
return pi.PkgRef, objPkgRef
}
}
// object from import . "xxx"
if compilePkgRef(ctx, nil, ident, flags, objPkgRef) {
return
}
// universe object
if obj := ctx.pkg.Builtin().TryRef(name); obj != nil {
if (flags&clIdentAllowBuiltin) == 0 && isBuiltin(o) && !strings.HasPrefix(o.Name(), "print") {
panic(ctx.newCodeErrorf(ident.Pos(), "use of builtin %s not in function call", name))
}
oldo, o = o, obj
} else if o == nil {
if (clIdentGoto & flags) != 0 {
l := ident.Obj.Data.(*ast.Ident)
panic(ctx.newCodeErrorf(l.Pos(), "label %v is not defined", l.Name))
}
panic(ctx.newCodeErrorf(ident.Pos(), "undefined: %s", name))
}
find:
if fvalue {
ctx.cb.Val(o, ident)
} else {
ctx.cb.VarRef(o, ident)
}
if rec := ctx.recorder(); rec != nil {
e := ctx.cb.Get(-1)
if oldo != nil && gox.IsTypeEx(e.Type) {
rec.Use(ident, oldo)
rec.Type(ident, typesutil.NewTypeAndValueForObject(oldo))
return
}
rec.Use(ident, o)
rec.Type(ident, typesutil.NewTypeAndValueForObject(o))
}
return
}
func isBuiltin(o types.Object) bool {
if _, ok := o.(*types.Builtin); ok {
return ok
}
return false
}
func compileMember(ctx *blockCtx, v ast.Node, name string, flags int) error {
var mflag gox.MemberFlag
switch {
case (flags & clIdentLHS) != 0:
mflag = gox.MemberFlagRef
case (flags & clCommandWithoutArgs) != 0:
mflag = gox.MemberFlagMethodAlias
case (flags & clIdentCanAutoCall) != 0:
mflag = gox.MemberFlagAutoProperty
default:
mflag = gox.MemberFlagMethodAlias
}
_, err := ctx.cb.Member(name, mflag, v)
return err
}
func compileExprLHS(ctx *blockCtx, expr ast.Expr) {
switch v := expr.(type) {
case *ast.Ident:
compileIdent(ctx, v, clIdentLHS)
case *ast.IndexExpr:
compileIndexExprLHS(ctx, v)
case *ast.SelectorExpr:
compileSelectorExprLHS(ctx, v)
recordTypesVariable(ctx, v, -1)
case *ast.StarExpr:
compileStarExprLHS(ctx, v)
default:
log.Panicln("compileExpr failed: unknown -", reflect.TypeOf(v))
}
}
func twoValue(inFlags []int) bool {
return inFlags != nil && (inFlags[0]&clCallWithTwoValue) != 0
}
func recordTypesValue(ctx *blockCtx, expr ast.Expr, n int) {
if rec := ctx.recorder(); rec != nil {
e := ctx.cb.Get(n)
rec.Type(expr, typesutil.NewTypeAndValueForValue(e.Type, e.CVal))
}
}
func recordTypesVariable(ctx *blockCtx, expr ast.Expr, n int) {
if rec := ctx.recorder(); rec != nil {
e := ctx.cb.Get(n)
t, _ := gox.DerefType(e.Type)
rec.Type(expr, typesutil.NewTypeAndValueForVariable(t))
}
}
func compileExpr(ctx *blockCtx, expr ast.Expr, inFlags ...int) {
switch v := expr.(type) {
case *ast.Ident:
flags := clIdentCanAutoCall
if inFlags != nil {
flags |= inFlags[0]
}
compileIdent(ctx, v, flags)
case *ast.BasicLit:
compileBasicLit(ctx, v)
recordTypesValue(ctx, v, -1)
case *ast.CallExpr:
flags := 0
if inFlags != nil {
flags = inFlags[0]
}
compileCallExpr(ctx, v, flags)
case *ast.SelectorExpr:
flags := clIdentCanAutoCall
if inFlags != nil {
flags |= inFlags[0]
}
compileSelectorExpr(ctx, v, flags)
case *ast.BinaryExpr:
compileBinaryExpr(ctx, v)
recordTypesValue(ctx, v, -1)
case *ast.UnaryExpr:
compileUnaryExpr(ctx, v, twoValue(inFlags))
recordTypesValue(ctx, v, -1)
case *ast.FuncLit:
compileFuncLit(ctx, v)
case *ast.CompositeLit:
compileCompositeLit(ctx, v, nil, false)
case *ast.SliceLit:
compileSliceLit(ctx, v, nil)
case *ast.RangeExpr:
compileRangeExpr(ctx, v)
case *ast.IndexExpr:
compileIndexExpr(ctx, v, twoValue(inFlags))
case *ast.IndexListExpr:
compileIndexListExpr(ctx, v, twoValue(inFlags))
case *ast.SliceExpr:
compileSliceExpr(ctx, v)
case *ast.StarExpr:
compileStarExpr(ctx, v)
case *ast.ArrayType:
ctx.cb.Typ(toArrayType(ctx, v), v)
case *ast.MapType:
ctx.cb.Typ(toMapType(ctx, v), v)
case *ast.StructType:
ctx.cb.Typ(toStructType(ctx, v), v)
case *ast.ChanType:
ctx.cb.Typ(toChanType(ctx, v), v)
case *ast.InterfaceType:
ctx.cb.Typ(toInterfaceType(ctx, v), v)
case *ast.ComprehensionExpr:
compileComprehensionExpr(ctx, v, twoValue(inFlags))
case *ast.TypeAssertExpr:
compileTypeAssertExpr(ctx, v, twoValue(inFlags))
case *ast.ParenExpr:
compileExpr(ctx, v.X, inFlags...)
case *ast.ErrWrapExpr:
compileErrWrapExpr(ctx, v, 0)
case *ast.FuncType:
ctx.cb.Typ(toFuncType(ctx, v, nil, nil), v)
case *ast.Ellipsis:
panic("compileEllipsis: ast.Ellipsis unexpected")
case *ast.KeyValueExpr:
panic("compileExpr: ast.KeyValueExpr unexpected")
default:
log.Panicln("compileExpr failed: unknown -", reflect.TypeOf(v))
}
}
func compileExprOrNone(ctx *blockCtx, expr ast.Expr) {
if expr != nil {
compileExpr(ctx, expr)
} else {
ctx.cb.None()
}
}
func compileUnaryExpr(ctx *blockCtx, v *ast.UnaryExpr, twoValue bool) {
compileExpr(ctx, v.X)
ctx.cb.UnaryOp(gotoken.Token(v.Op), twoValue, v)
}
func compileBinaryExpr(ctx *blockCtx, v *ast.BinaryExpr) {
compileExpr(ctx, v.X)
compileExpr(ctx, v.Y)
ctx.cb.BinaryOp(gotoken.Token(v.Op), v)
}
func compileIndexExprLHS(ctx *blockCtx, v *ast.IndexExpr) {
compileExpr(ctx, v.X)
compileExpr(ctx, v.Index)
ctx.cb.IndexRef(1, v)
}
func compileStarExprLHS(ctx *blockCtx, v *ast.StarExpr) { // *x = ...
compileExpr(ctx, v.X)
ctx.cb.ElemRef()
}
func compileStarExpr(ctx *blockCtx, v *ast.StarExpr) { // ... = *x
compileExpr(ctx, v.X)
ctx.cb.Star()
}
func compileTypeAssertExpr(ctx *blockCtx, v *ast.TypeAssertExpr, twoValue bool) {
compileExpr(ctx, v.X)
if v.Type == nil {
panic("TODO: x.(type) is only used in type switch")
}
typ := toType(ctx, v.Type)
ctx.cb.TypeAssert(typ, twoValue, v)
}
func compileIndexExpr(ctx *blockCtx, v *ast.IndexExpr, twoValue bool) { // x[i]
compileExpr(ctx, v.X)
compileExpr(ctx, v.Index)
ctx.cb.Index(1, twoValue, v)
}
func compileIndexListExpr(ctx *blockCtx, v *ast.IndexListExpr, twoValue bool) { // fn[t1,t2]
compileExpr(ctx, v.X)
n := len(v.Indices)
for i := 0; i < n; i++ {
compileExpr(ctx, v.Indices[i])
}
ctx.cb.Index(n, twoValue, v)
}
func compileSliceExpr(ctx *blockCtx, v *ast.SliceExpr) { // x[i:j:k]
compileExpr(ctx, v.X)
compileExprOrNone(ctx, v.Low)
compileExprOrNone(ctx, v.High)
if v.Slice3 {
compileExprOrNone(ctx, v.Max)
}
ctx.cb.Slice(v.Slice3, v)
}
func compileSelectorExprLHS(ctx *blockCtx, v *ast.SelectorExpr) {
switch x := v.X.(type) {
case *ast.Ident:
if at, kind := compileIdent(ctx, x, clIdentLHS|clIdentSelectorExpr); kind != objNormal {
ctx.cb.VarRef(at.Ref(v.Sel.Name))
return
}
default:
compileExpr(ctx, v.X)
}
ctx.cb.MemberRef(v.Sel.Name, v)
}
func compileSelectorExpr(ctx *blockCtx, v *ast.SelectorExpr, flags int) {
switch x := v.X.(type) {
case *ast.Ident:
if at, kind := compileIdent(ctx, x, flags|clIdentCanAutoCall|clIdentSelectorExpr); kind != objNormal {
if compilePkgRef(ctx, at, v.Sel, flags, kind) {
return
}
if token.IsExported(v.Sel.Name) {
panic(ctx.newCodeErrorf(x.Pos(), "undefined: %s.%s", x.Name, v.Sel.Name))
}
panic(ctx.newCodeErrorf(x.Pos(), "cannot refer to unexported name %s.%s", x.Name, v.Sel.Name))
}
default:
compileExpr(ctx, v.X)
if rec := ctx.recorder(); rec != nil {
e := ctx.cb.Get(-1)
rec.Type(v.X, typesutil.NewTypeAndValueForType(e.Type))
}
}
if err := compileMember(ctx, v, v.Sel.Name, flags); err != nil {
panic(err)
}
}
func pkgRef(at *gox.PkgRef, name string) (o types.Object, alias bool) {
if c := name[0]; c >= 'a' && c <= 'z' {
name = string(rune(c)+('A'-'a')) + name[1:]
if v := at.TryRef(name); v != nil && gox.IsFunc(v.Type()) {
return v, true
}
return
}
return at.TryRef(name), false
}
func lookupPkgRef(ctx *blockCtx, pkg *gox.PkgRef, x *ast.Ident, pkgKind int) (o types.Object, alias bool) {
if pkg != nil {
return pkgRef(pkg, x.Name)
}
if pkgKind == objPkgRef {
for _, at := range ctx.lookups {
if o2, alias2 := pkgRef(at, x.Name); o2 != nil {
if o != nil {
panic(ctx.newCodeErrorf(
x.Pos(), "confliction: %s declared both in \"%s\" and \"%s\"",
x.Name, at.Types.Path(), pkg.Types.Path()))
}
pkg, o, alias = at, o2, alias2
}
}
} else {
var cpkg *cpackages.PkgRef
for _, at := range ctx.clookups {
if o2 := at.Lookup(x.Name); o2 != nil {
if o != nil {
panic(ctx.newCodeErrorf(
x.Pos(), "confliction: %s declared both in \"%s\" and \"%s\"",
x.Name, at.Pkg().Types.Path(), cpkg.Pkg().Types.Path()))
}
cpkg, o = at, o2
}
}
}
return
}
func compilePkgRef(ctx *blockCtx, at *gox.PkgRef, x *ast.Ident, flags, pkgKind int) bool {
if v, alias := lookupPkgRef(ctx, at, x, pkgKind); v != nil {
cb := ctx.cb
if (flags & clIdentLHS) != 0 {
cb.VarRef(v, x)
} else {
autoprop := alias && (flags&clIdentCanAutoCall) != 0
if autoprop && !gox.HasAutoProperty(v.Type()) {
return false
}
cb.Val(v, x)
if autoprop {
cb.Call(0)
}
}
if rec := ctx.recorder(); rec != nil {
rec.Use(x, v)
}
return true
}
return false
}
type fnType struct {
next *fnType
params *types.Tuple
n1 int
variadic bool
typetype bool
inited bool
}
func (p *fnType) arg(i int, ellipsis bool) types.Type {
if i < p.n1 {
return p.params.At(i).Type()
}
if p.variadic {
t := p.params.At(p.n1).Type()
if ellipsis {
return t
}
return t.(*types.Slice).Elem()
}
return nil
}
func (p *fnType) init(t *types.Signature) {
p.params, p.variadic = t.Params(), t.Variadic()
p.n1 = p.params.Len()
if p.variadic {
p.n1--
}
}
func (p *fnType) initTypeType(t *gox.TypeType) {
param := types.NewParam(0, nil, "", t.Type())
p.params, p.typetype = types.NewTuple(param), true
p.n1 = 1
}
func (p *fnType) initWith(fnt types.Type, idx, nin int) {
if p.inited {
return
}
p.inited = true
if t, ok := fnt.(*gox.TypeType); ok {
p.initTypeType(t)
} else if t := gox.CheckSignatures(fnt, idx, nin); t != nil {
p.init(t[0])
for i := 1; i < len(t); i++ {
fn := &fnType{}
fn.inited = true
fn.init(t[i])
p.next = fn
p = p.next
}
}
}
func compileCallExpr(ctx *blockCtx, v *ast.CallExpr, inFlags int) {
switch fn := v.Fun.(type) {
case *ast.Ident:
compileIdent(ctx, fn, clIdentAllowBuiltin|inFlags)
case *ast.SelectorExpr:
compileSelectorExpr(ctx, fn, 0)
case *ast.ErrWrapExpr:
if v.IsCommand() {
callExpr := *v
callExpr.Fun = fn.X
ewExpr := *fn
ewExpr.X = &callExpr
compileErrWrapExpr(ctx, &ewExpr, inFlags)
return
}
compileErrWrapExpr(ctx, fn, 0)
default:
compileExpr(ctx, fn)
}
var fnt = ctx.cb.Get(-1).Type
var flags gox.InstrFlags
var ellipsis = v.Ellipsis != gotoken.NoPos
if ellipsis {
flags = gox.InstrFlagEllipsis
}
if (inFlags & clCallWithTwoValue) != 0 {
flags |= gox.InstrFlagTwoValue
}
var fn *fnType = &fnType{}
for fn != nil {
err := compileCallArgs(fn, fnt, ctx, v, ellipsis, flags)
if err == nil {
if rec := ctx.recorder(); rec != nil {
rec.Type(v, typesutil.NewTypeAndValueForCallResult(ctx.cb.Get(-1).Type))
}
break
}
if fn.next == nil {
panic(err)
}
fn = fn.next
}
}
func compileCallArgs(fn *fnType, fnt types.Type, ctx *blockCtx, v *ast.CallExpr, ellipsis bool, flags gox.InstrFlags) (err error) {
n := ctx.cb.InternalStack().Len()
defer func() {
if r := recover(); r != nil {
if e, ok := r.(error); ok {
err = e
} else {
src := ctx.LoadExpr(v)
err = ctx.newCodeErrorf(v.Pos(), "compile func %v error: %v", src, r)
}
ctx.cb.InternalStack().SetLen(n)
}
}()
for i, arg := range v.Args {
switch expr := arg.(type) {
case *ast.LambdaExpr:
fn.initWith(fnt, i, len(expr.Lhs))
sig := checkLambdaFuncType(ctx, expr, fn.arg(i, true), clLambaArgument, v.Fun)
compileLambdaExpr(ctx, expr, sig)
case *ast.LambdaExpr2:
fn.initWith(fnt, i, len(expr.Lhs))
sig := checkLambdaFuncType(ctx, expr, fn.arg(i, true), clLambaArgument, v.Fun)
compileLambdaExpr2(ctx, expr, sig)
case *ast.CompositeLit:
fn.initWith(fnt, i, -1)
compileCompositeLit(ctx, expr, fn.arg(i, ellipsis), true)
case *ast.SliceLit:
fn.initWith(fnt, i, -2)
t := fn.arg(i, ellipsis)
switch t.(type) {
case *types.Slice:
case *types.Named:
if _, ok := getUnderlying(ctx, t).(*types.Slice); !ok {
t = nil
}
default:
t = nil
}
typetype := fn.typetype && t != nil
if typetype {
ctx.cb.InternalStack().Pop()
}
compileSliceLit(ctx, expr, t)
if typetype {
return
}
default:
compileExpr(ctx, arg)
}
}
ctx.cb.CallWith(len(v.Args), flags, v)
return
}
type clLambaFlag string
const (
clLambaAssign clLambaFlag = "assignment"
clLambaField clLambaFlag = "field value"
clLambaArgument clLambaFlag = "argument"
)
// check lambda func type
func checkLambdaFuncType(ctx *blockCtx, lambda ast.Expr, ftyp types.Type, flag clLambaFlag, toNode ast.Node) *types.Signature {
typ := ftyp
retry:
switch t := typ.(type) {
case *types.Signature:
if l, ok := lambda.(*ast.LambdaExpr); ok {
if len(l.Rhs) != t.Results().Len() {
break
}
}
return t
case *types.Named:
typ = t.Underlying()
goto retry
}
src := ctx.LoadExpr(toNode)
err := ctx.newCodeErrorf(lambda.Pos(), "cannot use lambda literal as type %v in %v to %v", ftyp, flag, src)
panic(err)
}
func compileLambda(ctx *blockCtx, lambda ast.Expr, sig *types.Signature) {
switch expr := lambda.(type) {
case *ast.LambdaExpr:
compileLambdaExpr(ctx, expr, sig)
case *ast.LambdaExpr2:
compileLambdaExpr2(ctx, expr, sig)
}
}
func makeLambdaParams(ctx *blockCtx, pos token.Pos, lhs []*ast.Ident, in *types.Tuple) *types.Tuple {
pkg := ctx.pkg
n := len(lhs)
if nin := in.Len(); n != nin {
fewOrMany := "few"
if n > nin {
fewOrMany = "many"
}
has := make([]string, n)
for i, v := range lhs {
has[i] = v.Name
}
panic(ctx.newCodeErrorf(
pos, "too %s arguments in lambda expression\n\thave (%s)\n\twant %v", fewOrMany, strings.Join(has, ", "), in))
}
if n == 0 {
return nil
}
params := make([]*types.Var, n)
for i, name := range lhs {
params[i] = pkg.NewParam(name.Pos(), name.Name, in.At(i).Type())
}
return types.NewTuple(params...)
}
func makeLambdaResults(pkg *gox.Package, out *types.Tuple) *types.Tuple {
nout := out.Len()
if nout == 0 {
return nil
}
results := make([]*types.Var, nout)
for i := 0; i < nout; i++ {
results[i] = pkg.NewParam(token.NoPos, "", out.At(i).Type())
}
return types.NewTuple(results...)
}
func compileLambdaExpr(ctx *blockCtx, v *ast.LambdaExpr, sig *types.Signature) {
pkg := ctx.pkg
params := makeLambdaParams(ctx, v.Pos(), v.Lhs, sig.Params())
results := makeLambdaResults(pkg, sig.Results())
ctx.cb.NewClosure(params, results, false).BodyStart(pkg)
for _, v := range v.Rhs {
compileExpr(ctx, v)
}
ctx.cb.Return(len(v.Rhs)).End(v)
}
func compileLambdaExpr2(ctx *blockCtx, v *ast.LambdaExpr2, sig *types.Signature) {
pkg := ctx.pkg
params := makeLambdaParams(ctx, v.Pos(), v.Lhs, sig.Params())
results := makeLambdaResults(pkg, sig.Results())
comments, once := ctx.cb.BackupComments()
fn := ctx.cb.NewClosure(params, results, false)
loadFuncBody(ctx, fn, v.Body, v)
ctx.cb.SetComments(comments, once)
}
func compileFuncLit(ctx *blockCtx, v *ast.FuncLit) {
cb := ctx.cb
comments, once := cb.BackupComments()
sig := toFuncType(ctx, v.Type, nil, nil)
fn := cb.NewClosureWith(sig)
if body := v.Body; body != nil {
loadFuncBody(ctx, fn, body, v)
cb.SetComments(comments, once)
}
}
func compileBasicLit(ctx *blockCtx, v *ast.BasicLit) {
cb := ctx.cb
switch v.Kind {
case token.RAT:
val := v.Value
bi, _ := new(big.Int).SetString(val[:len(val)-1], 10) // remove r suffix
cb.UntypedBigInt(bi, v)
case token.CSTRING:
s, err := strconv.Unquote(v.Value)
if err != nil {
log.Panicln("compileBasicLit:", err)
}
n := len(s)
tyInt8 := types.Typ[types.Int8]
typ := types.NewArray(tyInt8, int64(n+1))
cb.Typ(types.NewPointer(tyInt8)).Typ(types.Typ[types.UnsafePointer])
for i := 0; i < n; i++ {
cb.Val(rune(s[i]))
}
cb.Val(rune(0)).ArrayLit(typ, n+1).UnaryOp(gotoken.AND).Call(1).Call(1)
default:
cb.Val(&goast.BasicLit{Kind: gotoken.Token(v.Kind), Value: v.Value}, v)
}
}
const (
compositeLitVal = 0
compositeLitKeyVal = 1
)
func checkCompositeLitElts(ctx *blockCtx, elts []ast.Expr, onlyStruct bool) (kind int) {
for _, elt := range elts {
if _, ok := elt.(*ast.KeyValueExpr); ok {
return compositeLitKeyVal
}
}
if len(elts) == 0 && onlyStruct {
return compositeLitKeyVal
}
return compositeLitVal
}
func compileCompositeLitElts(ctx *blockCtx, elts []ast.Expr, kind int, expected *kvType) {
for _, elt := range elts {
if kv, ok := elt.(*ast.KeyValueExpr); ok {
if key, ok := kv.Key.(*ast.CompositeLit); ok && key.Type == nil {
compileCompositeLit(ctx, key, expected.Key(), false)
} else {
compileExpr(ctx, kv.Key)
}
if val, ok := kv.Value.(*ast.CompositeLit); ok && val.Type == nil {
compileCompositeLit(ctx, val, expected.Elem(), false)
} else {
compileExpr(ctx, kv.Value)
}
} else {
if kind == compositeLitKeyVal {
ctx.cb.None()
}
if val, ok := elt.(*ast.CompositeLit); ok && val.Type == nil {
compileCompositeLit(ctx, val, expected.Elem(), false)
} else {
compileExpr(ctx, elt)
}
}
}
}
func compileStructLitInKeyVal(ctx *blockCtx, elts []ast.Expr, t *types.Struct, typ types.Type, src *ast.CompositeLit) {
for _, elt := range elts {
kv := elt.(*ast.KeyValueExpr)
name := kv.Key.(*ast.Ident)
idx := lookupField(t, name.Name)
if idx >= 0 {
ctx.cb.Val(idx)
} else {
src := ctx.LoadExpr(name)
err := ctx.newCodeErrorf(name.Pos(), "%s undefined (type %v has no field or method %s)", src, typ, name.Name)
panic(err)
}
if rec := ctx.recorder(); rec != nil {
rec.Use(name, t.Field(idx))
}
switch expr := kv.Value.(type) {
case *ast.LambdaExpr, *ast.LambdaExpr2:
sig := checkLambdaFuncType(ctx, expr, t.Field(idx).Type(), clLambaField, kv.Key)
compileLambda(ctx, expr, sig)
default:
compileExpr(ctx, kv.Value)
}
}
ctx.cb.StructLit(typ, len(elts)<<1, true, src)
}
func lookupField(t *types.Struct, name string) int {
for i, n := 0, t.NumFields(); i < n; i++ {
if fld := t.Field(i); fld.Name() == name {
return i
}
}
return -1
}
type kvType struct {
underlying types.Type
key, val types.Type
cached bool
}
func (p *kvType) required() *kvType {
if !p.cached {
p.cached = true
switch t := p.underlying.(type) {
case *types.Slice:
p.key, p.val = types.Typ[types.Int], t.Elem()
case *types.Array:
p.key, p.val = types.Typ[types.Int], t.Elem()
case *types.Map:
p.key, p.val = t.Key(), t.Elem()
}
}
return p
}
func (p *kvType) Key() types.Type {
return p.required().key
}
func (p *kvType) Elem() types.Type {
return p.required().val
}
func getUnderlying(ctx *blockCtx, typ types.Type) types.Type {
u := typ.Underlying()
if u == nil {
if t, ok := typ.(*types.Named); ok {
ctx.loadNamed(ctx.pkg, t)
u = t.Underlying()
}
}
return u
}
func compileCompositeLit(ctx *blockCtx, v *ast.CompositeLit, expected types.Type, onlyStruct bool) {
var hasPtr bool
var typ, underlying types.Type
var kind = checkCompositeLitElts(ctx, v.Elts, onlyStruct)
if v.Type != nil {
typ = toType(ctx, v.Type)
underlying = getUnderlying(ctx, typ)
} else if expected != nil {
if t, ok := expected.(*types.Pointer); ok {
expected, hasPtr = t.Elem(), true
}
if onlyStruct {
if kind == compositeLitKeyVal {
t := getUnderlying(ctx, expected)
if _, ok := t.(*types.Struct); ok { // can't omit non-struct type
typ, underlying = expected, t
}
}
} else {
typ, underlying = expected, getUnderlying(ctx, expected)
}
}
if t, ok := underlying.(*types.Struct); ok && kind == compositeLitKeyVal {
compileStructLitInKeyVal(ctx, v.Elts, t, typ, v)
if rec := ctx.recorder(); rec != nil {
rec.Type(v, typesutil.NewTypeAndValueForValue(typ, nil))
}
if hasPtr {
ctx.cb.UnaryOp(gotoken.AND)
}
return
}
compileCompositeLitElts(ctx, v.Elts, kind, &kvType{underlying: underlying})
n := len(v.Elts)
if typ == nil {
if kind == compositeLitVal && n > 0 {
panic("TODO: mapLit should be in {key: val, ...} form")
}
ctx.cb.MapLit(nil, n<<1)
return
}
if rec := ctx.recorder(); rec != nil {
rec.Type(v.Type, typesutil.NewTypeAndValueForType(typ))
rec.Type(v, typesutil.NewTypeAndValueForValue(typ, nil))
}
switch underlying.(type) {
case *types.Slice:
ctx.cb.SliceLitEx(typ, n<<kind, kind == compositeLitKeyVal, v)
case *types.Array:
ctx.cb.ArrayLitEx(typ, n<<kind, kind == compositeLitKeyVal, v)
case *types.Map:
ctx.cb.MapLit(typ, n<<1, v)
case *types.Struct:
ctx.cb.StructLit(typ, n, false, v)
default:
log.Panicln("compileCompositeLit: unknown type -", reflect.TypeOf(underlying))
}
if hasPtr {
ctx.cb.UnaryOp(gotoken.AND)
}
}
func compileSliceLit(ctx *blockCtx, v *ast.SliceLit, typ types.Type) {
n := len(v.Elts)
for _, elt := range v.Elts {
compileExpr(ctx, elt)
}
if sliceHasTypeParam(ctx, typ) {
ctx.cb.SliceLitEx(nil, n, false, v)
} else {
ctx.cb.SliceLitEx(typ, n, false, v)
}
}
func compileRangeExpr(ctx *blockCtx, v *ast.RangeExpr) {
pkg, cb := ctx.pkg, ctx.cb
cb.Val(pkg.Builtin().Ref("newRange"))
if v.First == nil {
ctx.cb.Val(0, v)
} else {
compileExpr(ctx, v.First)
}
compileExpr(ctx, v.Last)
if v.Expr3 == nil {
ctx.cb.Val(1, v)
} else {
compileExpr(ctx, v.Expr3)
}
cb.Call(3)
}
const (
comprehensionInvalid = iota
comprehensionList
comprehensionMap
comprehensionSelect
)
func comprehensionKind(v *ast.ComprehensionExpr) int {
switch v.Tok {
case token.LBRACK: // [
return comprehensionList
case token.LBRACE: // {
if _, ok := v.Elt.(*ast.KeyValueExpr); ok {
return comprehensionMap
}
return comprehensionSelect
}
panic("TODO: invalid comprehensionExpr")
}
// [expr for k, v <- container, cond]
// {for k, v <- container, cond}
// {expr for k, v <- container, cond}
// {kexpr: vexpr for k, v <- container, cond}
func compileComprehensionExpr(ctx *blockCtx, v *ast.ComprehensionExpr, twoValue bool) {
kind := comprehensionKind(v)
pkg, cb := ctx.pkg, ctx.cb
var results *types.Tuple
var ret *gox.Param