.

pkg/pclntab/pclntab_macho.go

@@ -0,0 +1,57 @@
+//go:build darwin
+
+package pclntab
+
+import (
+	"debug/macho"
+	"fmt"
+)
+
+func readPclntabSection(binaryPath string) ([]byte, error) {
+	f, err := macho.Open(binaryPath)
+	if err != nil {
+		return nil, fmt.Errorf("pclntab: failed to open Mach-O: %w", err)
+	}
+	defer f.Close()
+
+	sectionNames := []string{
+		"__gopclntab",
+		"__pclntab",
+	}
+
+	for _, section := range f.Sections {
+		for _, name := range sectionNames {
+			if section.Name == name {
+				data, err := section.Data()
+				if err != nil {
+					return nil, fmt.Errorf("pclntab: failed to read section %s: %w", name, err)
+				}
+				buf := make([]byte, len(data))
+				copy(buf, data)
+				return buf, nil
+			}
+		}
+	}
+
+	for _, section := range f.Sections {
+		data, err := section.Data()
+		if err != nil {
+			continue
+		}
+		if len(data) >= 8 {
+			for _, magic := range pclntabMagics {
+				if len(data) >= len(magic) && bytesEqual(data[:len(magic)], magic) {
+					buf := make([]byte, len(data))
+					copy(buf, data)
+					return buf, nil
+				}
+			}
+		}
+	}
+
+	return nil, nil
+}
+
+func WriteCorruptedPclntab(binaryPath string, corrupted []byte, outputPath string) error {
+	return fmt.Errorf("pclntab: offline Mach-O patching not yet implemented; use runtime corruption instead")
+}