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Merge pull request #1123 from nspcc-dev/feature/variadic

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compiler: support `...` variadic calls
This commit is contained in:
Roman Khimov 2020-06-27 11:00:48 +03:00 committed by GitHub
commit b92a1e3480
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 18 additions and 5 deletions
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5
pkg/compiler/codegen.go
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@ -758,8 +758,9 @@ func (c *codegen) Visit(node ast.Node) ast.Visitor {
}
// Do not swap for builtin functions.
if !isBuiltin {
if typ, ok := c.typeOf(n.Fun).(*types.Signature); ok && typ.Variadic() {
// pack variadic args into an array
typ, ok := c.typeOf(n.Fun).(*types.Signature)
if ok && typ.Variadic() && !n.Ellipsis.IsValid() {
// pack variadic args into an array only if last argument is not of form `...`
varSize := len(n.Args) - typ.Params().Len() + 1
c.emitReverse(varSize)
emit.Int(c.prog.BinWriter, int64(varSize))

18
pkg/compiler/function_call_test.go
View file

@ -186,7 +186,7 @@ func TestLocalsCount(t *testing.T) {
}
func TestVariadic(t *testing.T) {
src := `package foo
srcTmpl := `package foo
func someFunc(a int, b ...int) int {
sum := a
for i := range b {
@ -195,9 +195,21 @@ func TestVariadic(t *testing.T) {
return sum
}
func Main() int {
return someFunc(10, 1, 2, 3)
%s
return someFunc(10, %s)
}`
eval(t, src, big.NewInt(4))
t.Run("Elements", func(t *testing.T) {
src := fmt.Sprintf(srcTmpl, "", "1, 2, 3")
eval(t, src, big.NewInt(4))
})
t.Run("Slice", func(t *testing.T) {
src := fmt.Sprintf(srcTmpl, "a := []int{1, 2, 3}", "a...")
eval(t, src, big.NewInt(4))
})
t.Run("Literal", func(t *testing.T) {
src := fmt.Sprintf(srcTmpl, "", "[]int{1, 2, 3}...")
eval(t, src, big.NewInt(4))
})
}
func TestVariadicMethod(t *testing.T) {