feat: out objc class ivars

objc.go

@@ -370,7 +370,7 @@ func (f *File) GetCFStrings() ([]objc.CFString, error) {
 		}
 	}
 
-	return nil, fmt.Errorf("file does not contain a __objc_catlist section")
+	return nil, fmt.Errorf("file does not contain a __DATA.__cfstring section")
 }
 
 func (f *File) GetObjCProtocols() ([]objc.Protocol, error) {
@@ -691,6 +691,17 @@ func (f *File) GetObjCIvars(vmAddr uint64) ([]objc.Ivar, error) {
 	}
 
 	for _, ivar := range ivs {
+		off, err := f.GetOffset(f.convertToVMAddr(uint64(ivar.Offset)))
+		if err != nil {
+			return nil, fmt.Errorf("failed to convert vmaddr: %v", err)
+		}
+
+		f.sr.Seek(int64(off), io.SeekStart)
+
+		var o uint32
+		if err := binary.Read(f.sr, f.ByteOrder, &o); err != nil {
+			return nil, fmt.Errorf("failed to read ivar.offset: %v", err)
+		}
 		n, err := f.GetCString(f.convertToVMAddr(uint64(ivar.NameVMAddr)))
 		if err != nil {
 			return nil, fmt.Errorf("failed to read cstring: %v", err)
@@ -700,9 +711,10 @@ func (f *File) GetObjCIvars(vmAddr uint64) ([]objc.Ivar, error) {
 			return nil, fmt.Errorf("failed to read cstring: %v", err)
 		}
 		ivars = append(ivars, objc.Ivar{
-			Name:  n,
-			Type:  t,
-			IvarT: ivar,
+			Name:   n,
+			Type:   t,
+			Offset: o,
+			IvarT:  ivar,
 		})
 	}
 

types/objc/objc.go

@@ -369,6 +369,13 @@ func (c *Class) String() string {
 	if len(c.InstanceMethods) == 0 {
 		iMethods = ""
 	}
+	iVars := "  // instance variables\n"
+	for _, ivar := range c.Ivars {
+		iVars += fmt.Sprintf("  %s\n", &ivar)
+	}
+	if len(c.Ivars) == 0 {
+		iVars = ""
+	}
 	var subClass string
 	if c.ReadOnlyData.Flags.IsRoot() {
 		subClass = "<ROOT>"
@@ -378,12 +385,13 @@ func (c *Class) String() string {
 	}
 	return fmt.Sprintf(
 		"0x%011x %s : %s\n"+
+			"%s"+
 			"%s",
 		c.ClassPtr.VMAdder,
 		c.Name,
 		subClass,
-		iMethods,
-	)
+		iVars,
+		iMethods)
 }
 
 type ObjcClassT struct {
@@ -497,7 +505,13 @@ type IvarT struct {
 }
 
 type Ivar struct {
-	Name string
-	Type string
+	Name   string
+	Type   string
+	Offset uint32
 	IvarT
 }
+
+func (i *Ivar) String() string {
+	return fmt.Sprintf("+%#02x %s %s (%#x)", i.Offset, i.Type, i.Name, i.Size)
+	// return fmt.Sprintf("+%#02x %s %s (%#x)", i.Offset, getReturnType(i.Type), i.Name, i.Size)
+}