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// Package attr provides attributes for text and data sections.
package attr
import (
"fmt"
"math/bits"
"strings"
)
// Attribute represents TEXT or DATA flags.
type Attribute uint16
//go:generate go run make_textflag.go -output ztextflag.go
// Asm returns a representation of the attributes in assembly syntax. This may use macros from "textflags.h"; see ContainsTextFlags() to determine if this header is required.
func (a Attribute) Asm() string {
parts, rest := a.split()
if len(parts) == 0 || rest != 0 {
parts = append(parts, fmt.Sprintf("%d", rest))
}
return strings.Join(parts, "|")
}
// ContainsTextFlags returns whether the Asm() representation requires macros in "textflags.h".
func (a Attribute) ContainsTextFlags() bool {
flags, _ := a.split()
return len(flags) > 0
}
// split splits a into known flags and any remaining bits.
func (a Attribute) split() ([]string, Attribute) {
var flags []string
var rest Attribute
for a != 0 {
i := uint(bits.TrailingZeros16(uint16(a)))
bit := Attribute(1) << i
if flag := attrname[bit]; flag != "" {
flags = append(flags, flag)
} else {
rest |= bit
}
a ^= bit
}
return flags, rest
}
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