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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"
"syscall"
"github.com/goplus/gogen"
"github.com/goplus/gogen/cpackages"
"github.com/goplus/gop/ast"
"github.com/goplus/gop/printer"
"github.com/goplus/gop/token"
)
/*-----------------------------------------------------------------------------
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 // allow auto property
clIdentAllowBuiltin
clIdentLHS
clIdentSelectorExpr // this ident is X (not Sel) of ast.SelectorExpr
clIdentGoto
clCallWithTwoValue
clCommandWithoutArgs // this expr is a command without args (eg. ls)
clCommandIdent // this expr is a command and an ident (eg. mkdir "abc")
clIdentInStringLitEx // this expr is an ident in a string extended literal (eg. ${PATH})
)
const (
objNormal = iota
objPkgRef
objCPkgRef
objGopExecOrEnv
objGopEnv = objGopExecOrEnv
objGopExec = objGopExecOrEnv
)
func compileIdent(ctx *blockCtx, ident *ast.Ident, flags int) (pkg gogen.PkgRef, kind int) {
fvalue := (flags&clIdentSelectorExpr) != 0 || (flags&clIdentLHS) == 0
cb := ctx.cb
name := ident.Name
if name == "_" {
if fvalue {
panic(ctx.newCodeError(ident.Pos(), "cannot use _ as value"))
}
cb.VarRef(nil)
return
}
var recv *types.Var
var oldo types.Object
scope := ctx.pkg.Types.Scope()
at, o := 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 recv = classRecv(cb); recv != nil {
cb.Val(recv)
chkFlag := flags
if chkFlag&clIdentSelectorExpr != 0 { // TODO: remove this condition
chkFlag = clIdentCanAutoCall
}
if compileMember(ctx, ident, name, chkFlag) == nil { // class member object
return
}
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 {
kind = objCPkgRef
return
}
if pi, ok := ctx.findImport(name); ok {
if rec := ctx.recorder(); rec != nil {
rec.Use(ident, pi.pkgName)
}
return pi.PkgRef, objPkgRef
}
}
// function alias
if compileFuncAlias(ctx, scope, ident, flags) {
return
}
// object from import . "xxx"
if compilePkgRef(ctx, gogen.PkgRef{}, 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 {
// for support Gop_Exec, see TestSpxGopExec
if (clCommandIdent&flags) != 0 && recv != nil && gopMember(cb, recv, "Gop_Exec", ident) == nil {
kind = objGopExec
return
}
// for support Gop_Env, see TestSpxGopEnv
if (clIdentInStringLitEx&flags) != 0 && recv != nil && gopMember(cb, recv, "Gop_Env", ident) == nil {
kind = objGopEnv
return
}
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 {
cb.Val(o, ident)
} else {
cb.VarRef(o, ident)
}
if rec := ctx.recorder(); rec != nil {
e := cb.Get(-1)
if oldo != nil && gogen.IsTypeEx(e.Type) { // for builtin object
rec.recordIdent(ident, oldo)
return
}
rec.recordIdent(ident, o)
}
return
}
func compileEnvExpr(ctx *blockCtx, v *ast.EnvExpr) {
cb := ctx.cb
if ctx.isClass { // in a Go+ class file
if recv := classRecv(cb); recv != nil {
if gopMember(cb, recv, "Gop_Env", v) == nil {
name := v.Name
cb.Val(name.Name, name).CallWith(1, 0, v)
return
}
}
}
invalidVal(cb)
ctx.handleErrorf(v.Pos(), "operator $%v undefined", v.Name)
}
func classRecv(cb *gogen.CodeBuilder) *types.Var {
if fn := cb.Func(); fn != nil {
sig := fn.Ancestor().Type().(*types.Signature)
return sig.Recv()
}
return nil
}
func gopMember(cb *gogen.CodeBuilder, recv *types.Var, op string, src ...ast.Node) error {
_, e := cb.Val(recv).Member(op, gogen.MemberFlagVal, src...)
return e
}
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 gogen.MemberFlag
switch {
case (flags & clIdentLHS) != 0:
mflag = gogen.MemberFlagRef
case (flags & clIdentCanAutoCall) != 0:
mflag = gogen.MemberFlagAutoProperty
default:
mflag = gogen.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)
case *ast.StarExpr:
compileStarExprLHS(ctx, v)
default:
log.Panicln("compileExpr failed: unknown -", reflect.TypeOf(v))
}
if rec := ctx.recorder(); rec != nil {
rec.recordExpr(ctx, expr, true)
}
}
func twoValue(inFlags []int) bool {
return inFlags != nil && (inFlags[0]&clCallWithTwoValue) != 0
}
func identOrSelectorFlags(inFlags []int) (flags int, cmdNoArgs bool) {
if inFlags == nil {
return clIdentCanAutoCall, false
}
flags = inFlags[0]
if cmdNoArgs = (flags & clCommandWithoutArgs) != 0; cmdNoArgs {
flags &^= clCommandWithoutArgs
} else {
flags |= clIdentCanAutoCall
}
return
}
func callCmdNoArgs(ctx *blockCtx, src ast.Node, panicErr bool) (err error) {
if gogen.IsFunc(ctx.cb.InternalStack().Get(-1).Type) {
if err = ctx.cb.CallWithEx(0, 0, src); err != nil {
if panicErr {
panic(err)
}
}
}
return
}
func compileExpr(ctx *blockCtx, expr ast.Expr, inFlags ...int) {
switch v := expr.(type) {
case *ast.Ident:
flags, cmdNoArgs := identOrSelectorFlags(inFlags)
if cmdNoArgs {
flags |= clCommandIdent // for support Gop_Exec, see TestSpxGopExec
}
_, kind := compileIdent(ctx, v, flags)
if cmdNoArgs || kind == objGopExecOrEnv {
cb := ctx.cb
if kind == objGopExecOrEnv {
cb.Val(v.Name, v)
} else {
err := callCmdNoArgs(ctx, expr, false)
if err == nil {
return
}
if !(ctx.isClass && tryGopExec(cb, v)) {
panic(err)
}
}
cb.CallWith(1, 0, v)
}
case *ast.BasicLit:
compileBasicLit(ctx, v)
case *ast.CallExpr:
flags := 0
if inFlags != nil {
flags = inFlags[0]
}
compileCallExpr(ctx, v, flags)
case *ast.SelectorExpr:
flags, cmdNoArgs := identOrSelectorFlags(inFlags)
compileSelectorExpr(ctx, v, flags)
if cmdNoArgs {
callCmdNoArgs(ctx, expr, true)
return
}
case *ast.BinaryExpr:
compileBinaryExpr(ctx, v)
case *ast.UnaryExpr:
compileUnaryExpr(ctx, v, twoValue(inFlags))
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.EnvExpr:
compileEnvExpr(ctx, v)
default:
log.Panicf("compileExpr failed: unknown - %T\n", v)
}
if rec := ctx.recorder(); rec != nil {
rec.recordExpr(ctx, expr, false)
}
}
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 err := compileMember(ctx, v, v.Sel.Name, flags); err != nil {
panic(err)
}
}
func compileFuncAlias(ctx *blockCtx, scope *types.Scope, x *ast.Ident, flags int) bool {
name := x.Name
if c := name[0]; c >= 'a' && c <= 'z' {
name = string(rune(c)+('A'-'a')) + name[1:]
o := scope.Lookup(name)
if o == nil && ctx.loadSymbol(name) {
o = scope.Lookup(name)
}
if o != nil {
return identVal(ctx, x, flags, o, true)
}
}
return false
}
func pkgRef(at gogen.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 && gogen.IsFunc(v.Type()) {
return v, true
}
return
}
return at.TryRef(name), false
}
// allow pkg.Types to be nil
func lookupPkgRef(ctx *blockCtx, pkg gogen.PkgRef, x *ast.Ident, pkgKind int) (o types.Object, alias bool) {
if pkg.Types != 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
}
// allow at.Types to be nil
func compilePkgRef(ctx *blockCtx, at gogen.PkgRef, x *ast.Ident, flags, pkgKind int) bool {
if v, alias := lookupPkgRef(ctx, at, x, pkgKind); v != nil {
if (flags & clIdentLHS) != 0 {
if rec := ctx.recorder(); rec != nil {
rec.Use(x, v)
}
ctx.cb.VarRef(v, x)
return true
}
return identVal(ctx, x, flags, v, alias)
}
return false
}
func identVal(ctx *blockCtx, x *ast.Ident, flags int, v types.Object, alias bool) bool {
autocall := false
if alias {
if autocall = (flags & clIdentCanAutoCall) != 0; autocall {
if !gogen.HasAutoProperty(v.Type()) {
return false
}
}
}
if rec := ctx.recorder(); rec != nil {
rec.Use(x, v)
}
cb := ctx.cb.Val(v, x)
if autocall {
cb.CallWith(0, 0, x)
}
return true
}
type fnType struct {
next *fnType
params *types.Tuple
base int
size int
variadic bool
typetype bool
}
func (p *fnType) arg(i int, ellipsis bool) types.Type {
if i+p.base < p.size {
return p.params.At(i + p.base).Type()
}
if p.variadic {
t := p.params.At(p.size).Type()
if ellipsis {
return t
}
return t.(*types.Slice).Elem()
}
return nil
}
func (p *fnType) init(base int, t *types.Signature) {
p.base = base
p.params, p.variadic = t.Params(), t.Variadic()
p.size = p.params.Len()
if p.variadic {
p.size--
}
}
func (p *fnType) initTypeType(t *gogen.TypeType) {
param := types.NewParam(0, nil, "", t.Type())
p.params, p.typetype = types.NewTuple(param), true
p.size = 1
}
func (p *fnType) load(fnt types.Type) {
switch v := fnt.(type) {
case *gogen.TypeType:
p.initTypeType(v)
case *types.Signature:
typ, objs := gogen.CheckSigFuncExObjects(v)
switch typ.(type) {
case *gogen.TyOverloadFunc, *gogen.TyOverloadMethod:
p.initFuncs(0, objs)
return
case *gogen.TyTemplateRecvMethod:
p.initFuncs(1, objs)
return
}
p.init(0, v)
}
}
func (p *fnType) initFuncs(base int, funcs []types.Object) {
for i, obj := range funcs {
if sig, ok := obj.Type().(*types.Signature); ok {
if i == 0 {
p.init(base, sig)
} else {
fn := &fnType{}
fn.init(base, sig)
p.next = fn
p = p.next
}
}
}
}
func compileCallExpr(ctx *blockCtx, v *ast.CallExpr, inFlags int) {
var ifn *ast.Ident
switch fn := v.Fun.(type) {
case *ast.Ident:
if v.IsCommand() { // for support Gop_Exec, see TestSpxGopExec
inFlags |= clCommandIdent
}
if _, kind := compileIdent(ctx, fn, clIdentAllowBuiltin|inFlags); kind == objGopExec {
args := make([]ast.Expr, 1, len(v.Args)+1)
args[0] = toBasicLit(fn)
args = append(args, v.Args...)
v = &ast.CallExpr{Fun: fn, Args: args, Ellipsis: v.Ellipsis, NoParenEnd: v.NoParenEnd}
} else {
ifn = fn
}
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 err error
var stk = ctx.cb.InternalStack()
var base = stk.Len()
var fnt = stk.Get(-1).Type
var flags gogen.InstrFlags
var ellipsis = v.Ellipsis != gotoken.NoPos
if ellipsis {
flags = gogen.InstrFlagEllipsis
}
if (inFlags & clCallWithTwoValue) != 0 {
flags |= gogen.InstrFlagTwoValue
}
fn := &fnType{}
fn.load(fnt)
for fn != nil {
if err = compileCallArgs(fn, ctx, v, ellipsis, flags); err == nil {
if rec := ctx.recorder(); rec != nil {
rec.recordCallExpr(ctx, v, fnt)
}
return
}
stk.SetLen(base)
fn = fn.next
}
if ifn != nil && builtinOrGopExec(ctx, ifn, v, flags) == nil {
return
}
panic(err)
}
func toBasicLit(fn *ast.Ident) *ast.BasicLit {
return &ast.BasicLit{ValuePos: fn.NamePos, Kind: token.STRING, Value: strconv.Quote(fn.Name)}
}
// maybe builtin new/delete: see TestSpxNewObj, TestMayBuiltinDelete
// maybe Gop_Exec: see TestSpxGopExec
func builtinOrGopExec(ctx *blockCtx, ifn *ast.Ident, v *ast.CallExpr, flags gogen.InstrFlags) error {
cb := ctx.cb
switch name := ifn.Name; name {
case "new", "delete":
cb.InternalStack().PopN(1)
cb.Val(ctx.pkg.Builtin().Ref(name), ifn)
return fnCall(ctx, v, flags, 0)
default:
// for support Gop_Exec, see TestSpxGopExec
if v.IsCommand() && ctx.isClass && tryGopExec(cb, ifn) {
return fnCall(ctx, v, flags, 1)
}
}
return syscall.ENOENT
}
func tryGopExec(cb *gogen.CodeBuilder, ifn *ast.Ident) bool {
if recv := classRecv(cb); recv != nil {
cb.InternalStack().PopN(1)
if gopMember(cb, recv, "Gop_Exec", ifn) == nil {
cb.Val(ifn.Name, ifn)
return true
}
}
return false
}
func fnCall(ctx *blockCtx, v *ast.CallExpr, flags gogen.InstrFlags, extra int) error {
for _, arg := range v.Args {
compileExpr(ctx, arg)
}
return ctx.cb.CallWithEx(len(v.Args)+extra, flags, v)
}
func compileCallArgs(fn *fnType, ctx *blockCtx, v *ast.CallExpr, ellipsis bool, flags gogen.InstrFlags) (err error) {
for i, arg := range v.Args {
switch expr := arg.(type) {
case *ast.LambdaExpr:
sig, e := checkLambdaFuncType(ctx, expr, fn.arg(i, ellipsis), clLambaArgument, v.Fun)
if e != nil {
return e
}
if err = compileLambdaExpr(ctx, expr, sig); err != nil {
return
}
case *ast.LambdaExpr2:
sig, e := checkLambdaFuncType(ctx, expr, fn.arg(i, ellipsis), clLambaArgument, v.Fun)
if e != nil {
return e
}
if err = compileLambdaExpr2(ctx, expr, sig); err != nil {
return
}
case *ast.CompositeLit:
if err = compileCompositeLitEx(ctx, expr, fn.arg(i, ellipsis), true); err != nil {
return
}
case *ast.SliceLit:
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().PopN(1)
}
if err = compileSliceLit(ctx, expr, t, true); err != nil {
return
}
if typetype {
return
}
default:
compileExpr(ctx, arg)
}
}
return ctx.cb.CallWithEx(len(v.Args), flags, v)
}
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, error) {
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, nil
case *types.Named:
typ = t.Underlying()
goto retry
}
src := ctx.LoadExpr(toNode)
return nil, ctx.newCodeErrorf(lambda.Pos(), "cannot use lambda literal as type %v in %v to %v", ftyp, flag, src)
}
func compileLambda(ctx *blockCtx, lambda ast.Expr, sig *types.Signature) {
switch expr := lambda.(type) {
case *ast.LambdaExpr:
if err := compileLambdaExpr(ctx, expr, sig); err != nil {
panic(err)
}
case *ast.LambdaExpr2:
if err := compileLambdaExpr2(ctx, expr, sig); err != nil {
panic(err)
}
}
}
func makeLambdaParams(ctx *blockCtx, pos token.Pos, lhs []*ast.Ident, in *types.Tuple) (*types.Tuple, error) {
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
}
return nil, 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, nil
}
params := make([]*types.Var, n)
for i, name := range lhs {
param := pkg.NewParam(name.Pos(), name.Name, in.At(i).Type())
params[i] = param
if rec := ctx.recorder(); rec != nil {
rec.Def(name, param)
}
}
return types.NewTuple(params...), nil
}
func makeLambdaResults(pkg *gogen.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) error {
pkg := ctx.pkg
params, err := makeLambdaParams(ctx, v.Pos(), v.Lhs, sig.Params())
if err != nil {
return err
}
results := makeLambdaResults(pkg, sig.Results())
ctx.cb.NewClosure(params, results, false).BodyStart(pkg)
if len(v.Lhs) > 0 {
defNames(ctx, v.Lhs, ctx.cb.Scope())
}
for _, v := range v.Rhs {
compileExpr(ctx, v)
}
if rec := ctx.recorder(); rec != nil {
rec.Scope(v, ctx.cb.Scope())
}
ctx.cb.Return(len(v.Rhs)).End(v)
return nil
}
func compileLambdaExpr2(ctx *blockCtx, v *ast.LambdaExpr2, sig *types.Signature) error {
pkg := ctx.pkg
params, err := makeLambdaParams(ctx, v.Pos(), v.Lhs, sig.Params())
if err != nil {
return err
}
results := makeLambdaResults(pkg, sig.Results())
comments, once := ctx.cb.BackupComments()
fn := ctx.cb.NewClosure(params, results, false)
cb := fn.BodyStart(ctx.pkg, v.Body)
if len(v.Lhs) > 0 {
defNames(ctx, v.Lhs, cb.Scope())
}
compileStmts(ctx, v.Body.List)
if rec := ctx.recorder(); rec != nil {
rec.Scope(v, ctx.cb.Scope())
}
cb.End(v)
ctx.cb.SetComments(comments, once)
return nil
}
func compileFuncLit(ctx *blockCtx, v *ast.FuncLit) {
cb := ctx.cb
comments, once := cb.BackupComments()
sig := toFuncType(ctx, v.Type, nil, nil)
if rec := ctx.recorder(); rec != nil {
rec.recordFuncLit(v, sig)
}
fn := cb.NewClosureWith(sig)
if body := v.Body; body != nil {
loadFuncBody(ctx, fn, body, nil, 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:
if v.Extra == nil {
basicLit(cb, v)
return
}
compileStringLitEx(ctx, cb, v)
}
}
func invalidVal(cb *gogen.CodeBuilder) {
cb.Val(&gogen.Element{Type: types.Typ[types.Invalid]})
}
func basicLit(cb *gogen.CodeBuilder, v *ast.BasicLit) {
cb.Val(&goast.BasicLit{Kind: gotoken.Token(v.Kind), Value: v.Value}, v)
}
const (
stringutilPkgPath = "github.com/qiniu/x/stringutil"
)
func compileStringLitEx(ctx *blockCtx, cb *gogen.CodeBuilder, lit *ast.BasicLit) {
pos := lit.ValuePos + 1
quote := lit.Value[:1]
parts := lit.Extra.Parts
n := len(parts)
if n != 1 {
cb.Val(ctx.pkg.Import(stringutilPkgPath).Ref("Concat"))
}
for _, part := range parts {
switch v := part.(type) {
case string: // normal string literal or end with "$$"
next := pos + token.Pos(len(v))
if strings.HasSuffix(v, "$$") {
v = v[:len(v)-1]
}
basicLit(cb, &ast.BasicLit{ValuePos: pos - 1, Value: quote + v + quote, Kind: token.STRING})
pos = next
case ast.Expr:
flags := 0
if _, ok := v.(*ast.Ident); ok {
flags = clIdentInStringLitEx
}
compileExpr(ctx, v, flags)
t := cb.Get(-1).Type
if t.Underlying() != types.Typ[types.String] {
if _, err := cb.Member("string", gogen.MemberFlagAutoProperty); err != nil {
if e, ok := err.(*gogen.CodeError); ok {
err = ctx.newCodeErrorf(v.Pos(), "%s.string%s", ctx.LoadExpr(v), e.Msg)
}
ctx.handleErr(err)
}