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obj.go
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obj.go
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//
// Copyright 2024 CloudWeGo Authors
//
// 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 obj
import (
`fmt`
`io`
`os`
)
// Format represents the saved binary file format.
type Format int
const (
// ELF indicates it should be saved as an ELF binary.
ELF Format = iota
// MachO indicates it should be saved as a Mach-O binary.
MachO
)
var formatTab = [...]func(w io.Writer, code []byte, base uint64, entry uint64) error {
ELF : nil,
MachO : assembleMachO,
}
var formatNames = map[Format]string {
ELF : "ELF",
MachO : "Mach-O",
}
// String returns the name of a specified format.
func (self Format) String() string {
if v, ok := formatNames[self]; ok {
return v
} else {
return fmt.Sprintf("Format(%d)", self)
}
}
// Write assembles a binary executable.
func (self Format) Write(w io.Writer, code []byte, base uint64, entry uint64) error {
if self >= 0 && int(self) < len(formatTab) && formatTab[self] != nil {
return formatTab[self](w, code, base, entry)
} else {
return fmt.Errorf("unsupported format: %s", self)
}
}
// Generate generates a binary executable file from the specified code.
func (self Format) Generate(name string, code []byte, base uint64, entry uint64) error {
var fp *os.File
var err error
/* create the output file */
if fp, err = os.Create(name); err != nil {
return err
}
/* generate the code */
if err = self.Write(fp, code, base, entry); err != nil {
_ = fp.Close()
_ = os.Remove(name)
return err
}
/* close the file and make it executable */
_ = fp.Close()
_ = os.Chmod(name, 0755)
return nil
}