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// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// This file contains tests for sizes.
package types2_test
import (
"cmd/compile/internal/syntax"
"cmd/compile/internal/types2"
"internal/testenv"
"testing"
)
// findStructType typechecks src and returns the first struct type encountered.
func findStructType(t *testing.T, src string) *types2.Struct {
return findStructTypeConfig(t, src, &types2.Config{})
}
func findStructTypeConfig(t *testing.T, src string, conf *types2.Config) *types2.Struct {
types := make(map[syntax.Expr]types2.TypeAndValue)
mustTypecheck(src, nil, &types2.Info{Types: types})
for _, tv := range types {
if ts, ok := tv.Type.(*types2.Struct); ok {
return ts
}
}
t.Fatalf("failed to find a struct type in src:\n%s\n", src)
return nil
}
// go.dev/issue/16316
func TestMultipleSizeUse(t *testing.T) {
const src = `
package main
type S struct {
i int
b bool
s string
n int
}
`
ts := findStructType(t, src)
sizes := types2.StdSizes{WordSize: 4, MaxAlign: 4}
if got := sizes.Sizeof(ts); got != 20 {
t.Errorf("Sizeof(%v) with WordSize 4 = %d want 20", ts, got)
}
sizes = types2.StdSizes{WordSize: 8, MaxAlign: 8}
if got := sizes.Sizeof(ts); got != 40 {
t.Errorf("Sizeof(%v) with WordSize 8 = %d want 40", ts, got)
}
}
// go.dev/issue/16464
func TestAlignofNaclSlice(t *testing.T) {
const src = `
package main
var s struct {
x *int
y []byte
}
`
ts := findStructType(t, src)
sizes := &types2.StdSizes{WordSize: 4, MaxAlign: 8}
var fields []*types2.Var
// Make a copy manually :(
for i := 0; i < ts.NumFields(); i++ {
fields = append(fields, ts.Field(i))
}
offsets := sizes.Offsetsof(fields)
if offsets[0] != 0 || offsets[1] != 4 {
t.Errorf("OffsetsOf(%v) = %v want %v", ts, offsets, []int{0, 4})
}
}
func TestIssue16902(t *testing.T) {
const src = `
package a
import "unsafe"
const _ = unsafe.Offsetof(struct{ x int64 }{}.x)
`
info := types2.Info{Types: make(map[syntax.Expr]types2.TypeAndValue)}
conf := types2.Config{
Importer: defaultImporter(),
Sizes: &types2.StdSizes{WordSize: 8, MaxAlign: 8},
}
mustTypecheck(src, &conf, &info)
for _, tv := range info.Types {
_ = conf.Sizes.Sizeof(tv.Type)
_ = conf.Sizes.Alignof(tv.Type)
}
}
// go.dev/issue/53884.
func TestAtomicAlign(t *testing.T) {
testenv.MustHaveGoBuild(t) // The Go command is needed for the importer to determine the locations of stdlib .a files.
const src = `
package main
import "sync/atomic"
var s struct {
x int32
y atomic.Int64
z int64
}
`
want := []int64{0, 8, 16}
for _, arch := range []string{"386", "amd64"} {
t.Run(arch, func(t *testing.T) {
conf := types2.Config{
Importer: defaultImporter(),
Sizes: types2.SizesFor("gc", arch),
}
ts := findStructTypeConfig(t, src, &conf)
var fields []*types2.Var
// Make a copy manually :(
for i := 0; i < ts.NumFields(); i++ {
fields = append(fields, ts.Field(i))
}
offsets := conf.Sizes.Offsetsof(fields)
if offsets[0] != want[0] || offsets[1] != want[1] || offsets[2] != want[2] {
t.Errorf("OffsetsOf(%v) = %v want %v", ts, offsets, want)
}
})
}
}
type gcSizeTest struct {
name string
src string
}
var gcSizesTests = []gcSizeTest{
{
"issue60431",
`
package main
import "unsafe"
// The foo struct size is expected to be rounded up to 16 bytes.
type foo struct {
a int64
b bool
}
func main() {
assert(unsafe.Sizeof(foo{}) == 16)
}`,
},
{
"issue60734",
`
package main
import (
"unsafe"
)
// The Data struct size is expected to be rounded up to 16 bytes.
type Data struct {
Value uint32 // 4 bytes
Label [10]byte // 10 bytes
Active bool // 1 byte
// padded with 1 byte to make it align
}
func main() {
assert(unsafe.Sizeof(Data{}) == 16)
}
`,
},
}
func TestGCSizes(t *testing.T) {
types2.DefPredeclaredTestFuncs()
for _, tc := range gcSizesTests {
tc := tc
t.Run(tc.name, func(t *testing.T) {
t.Parallel()
conf := types2.Config{Importer: defaultImporter(), Sizes: types2.SizesFor("gc", "amd64")}
mustTypecheck(tc.src, &conf, nil)
})
}
}
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