From bbd64de0e8c528097aef0768c038ebeee81974f5 Mon Sep 17 00:00:00 2001
From: blacktop <blacktop@users.noreply.github.com>
Date: Tue, 23 Apr 2024 13:29:04 -0600
Subject: [PATCH] fix: swift protocol typeref ptr == 0 bind parsing

---
 swift.go | 94 +++++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 66 insertions(+), 28 deletions(-)

diff --git a/swift.go b/swift.go
index 2d8f4dc..79475a7 100644
--- a/swift.go
+++ b/swift.go
@@ -1112,17 +1112,27 @@ func (f *File) parseProtocol(r io.ReadSeeker, typ *swift.Type) (prot *swift.Prot
 					if err != nil {
 						return nil, fmt.Errorf("failed to read signature requirement protocol pointer: %v", err)
 					}
-					prot.SignatureRequirements[idx].Kind, err = f.GetBindName(ptr)
-					if err != nil {
-						f.cr.SeekToAddr(ptr)
-						pc, err := f.getContextDesc(ptr)
-						if err != nil {
-							return nil, fmt.Errorf("failed to read signature requirement protocol: %v", err)
+					if ptr == 0 {
+						ptr = req.TypeOrProtocolOrConformanceOrLayoutOff.GetRelPtrAddress()
+						if (ptr & 1) == 1 {
+							ptr = ptr &^ 1
 						}
-						if pc.Parent != "" {
-							prot.SignatureRequirements[idx].Kind = fmt.Sprintf("%s.%s", pc.Parent, pc.Name)
-						} else {
-							prot.SignatureRequirements[idx].Kind = pc.Name
+						if bind, err := f.GetBindName(ptr); err == nil {
+							prot.SignatureRequirements[idx].Kind = bind
+						}
+					} else {
+						prot.SignatureRequirements[idx].Kind, err = f.GetBindName(ptr)
+						if err != nil {
+							f.cr.SeekToAddr(ptr)
+							pc, err := f.getContextDesc(ptr)
+							if err != nil {
+								return nil, fmt.Errorf("failed to read signature requirement protocol: %v", err)
+							}
+							if pc.Parent != "" {
+								prot.SignatureRequirements[idx].Kind = fmt.Sprintf("%s.%s", pc.Parent, pc.Name)
+							} else {
+								prot.SignatureRequirements[idx].Kind = pc.Name
+							}
 						}
 					}
 				}
@@ -1262,25 +1272,37 @@ func (f *File) readProtocolConformance(r io.ReadSeeker, addr uint64) (pcd *swift
 			return nil, fmt.Errorf("failed to get indirect type descriptor pointer: %v", err)
 		}
 		ptr = f.vma.Convert(ptr)
-		if bind, err := f.GetBindName(ptr); err == nil {
-			pcd.TypeRef = &swift.Type{
-				Address: ptr,
-				Name:    bind,
-			}
-		} else {
-			f.cr.SeekToAddr(ptr)
-			ctx, err := f.getContextDesc(ptr)
-			if err != nil {
-				return nil, fmt.Errorf("failed to get parent: %v", err)
+		if ptr == 0 {
+			if (addr & 1) == 1 {
+				addr = addr &^ 1
 			}
-			pcd.TypeRef = &swift.Type{
-				Address: ptr,
-				Name:    ctx.Name,
-				Parent: &swift.Type{
-					Name: ctx.Parent,
-				},
+			if bind, err := f.GetBindName(addr); err == nil {
+				pcd.TypeRef = &swift.Type{
+					Address: addr,
+					Name:    bind,
+				}
 			}
+		} else {
+			if bind, err := f.GetBindName(ptr); err == nil {
+				pcd.TypeRef = &swift.Type{
+					Address: ptr,
+					Name:    bind,
+				}
+			} else {
+				f.cr.SeekToAddr(ptr)
+				ctx, err := f.getContextDesc(ptr)
+				if err != nil {
+					return nil, fmt.Errorf("failed to get parent: %v", err)
+				}
+				pcd.TypeRef = &swift.Type{
+					Address: ptr,
+					Name:    ctx.Name,
+					Parent: &swift.Type{
+						Name: ctx.Parent,
+					},
+				}
 
+			}
 		}
 	case swift.DirectObjCClassName:
 		name, err := f.GetCString(pcd.TypeRefOffsest.GetRelPtrAddress())
@@ -1345,7 +1367,15 @@ func (f *File) readProtocolConformance(r io.ReadSeeker, addr uint64) (pcd *swift
 					return nil, fmt.Errorf("failed to read conditional requirement protocol pointer: %v", err)
 				}
 				ptr = f.vma.Convert(ptr)
-				if bind, err := f.GetBindName(ptr); err == nil {
+				if ptr == 0 {
+					ptr = req.TypeOrProtocolOrConformanceOrLayoutOff.GetRelPtrAddress()
+					if (ptr & 1) == 1 {
+						ptr = ptr &^ 1
+					}
+					if bind, err := f.GetBindName(ptr); err == nil {
+						pcd.ConditionalRequirements[idx].Kind = bind
+					}
+				} else if bind, err := f.GetBindName(ptr); err == nil {
 					pcd.ConditionalRequirements[idx].Kind = bind
 				} else {
 					f.cr.SeekToAddr(ptr)
@@ -2220,7 +2250,15 @@ func (f *File) parseGenericContext(ctx *swift.TypeGenericContext) (err error) {
 						return fmt.Errorf("failed to read generic requirement param protocol pointer: %v", err)
 					}
 					ptr = f.vma.Convert(ptr)
-					if bind, err := f.GetBindName(ptr); err == nil {
+					if ptr == 0 {
+						ptr = req.TypeOrProtocolOrConformanceOrLayoutOff.GetRelPtrAddress()
+						if (ptr & 1) == 1 {
+							ptr = ptr &^ 1
+						}
+						if bind, err := f.GetBindName(ptr); err == nil {
+							ctx.Requirements[idx].Kind = bind
+						}
+					} else if bind, err := f.GetBindName(ptr); err == nil {
 						ctx.Requirements[idx].Kind = bind
 					} else {
 						f.cr.SeekToAddr(ptr)