chore: go mod vendor / tidy

vendor/github.com/mmcloughlin/avo/attr/attr.go

@@ -0,0 +1,45 @@
+// 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
+}