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aligncheck.go
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/
aligncheck.go
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// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package main
import (
"flag"
"fmt"
"go/build"
"log"
"os"
"sort"
"unsafe"
"github.com/kisielk/gotool"
"golang.org/x/tools/go/loader"
"go/types"
)
var stdSizes = types.StdSizes{
WordSize: int64(unsafe.Sizeof(int(0))),
MaxAlign: 8,
}
func main() {
flag.Parse()
exitStatus := 0
importPaths := gotool.ImportPaths(flag.Args())
if len(importPaths) == 0 {
importPaths = []string{"."}
}
ctx := build.Default
loadcfg := loader.Config{
Build: &ctx,
}
rest, err := loadcfg.FromArgs(importPaths, false)
if err != nil {
log.Fatalf("could not parse arguments: %s", err)
}
if len(rest) > 0 {
log.Fatalf("unhandled extra arguments: %v", rest)
}
program, err := loadcfg.Load()
if err != nil {
log.Fatalf("could not type check: %s", err)
}
var lines []string
for _, pkgInfo := range program.InitialPackages() {
for _, obj := range pkgInfo.Defs {
if obj == nil {
continue
}
if _, ok := obj.(*types.TypeName); !ok {
continue
}
typ, ok := obj.Type().(*types.Named)
if !ok {
continue
}
strukt, ok := typ.Underlying().(*types.Struct)
if !ok {
continue
}
structAlign := int(stdSizes.Alignof(strukt))
structSize := int(stdSizes.Sizeof(strukt))
if structSize%structAlign != 0 {
structSize += structAlign - structSize%structAlign
}
minSize := 0
for i := 0; i < strukt.NumFields(); i++ {
field := strukt.Field(i)
fieldType := field.Type()
typeSize := int(stdSizes.Sizeof(fieldType))
minSize += typeSize
}
if minSize%structAlign != 0 {
minSize += structAlign - minSize%structAlign
}
if minSize != structSize {
pos := program.Fset.Position(obj.Pos())
lines = append(lines, fmt.Sprintf(
"%s: %s:%d:%d: struct %s could have size %d (currently %d)",
obj.Pkg().Path(),
pos.Filename,
pos.Line,
pos.Column,
obj.Name(),
minSize,
structSize,
))
exitStatus = 1
}
}
}
sort.Strings(lines)
for _, line := range lines {
fmt.Println(line)
}
os.Exit(exitStatus)
}