objc_namespace: Update parsing logic to account for otool changes

The textual output of otool in recent Xcode releases has changed.
We now look for OBJC_CLASS_RO/OBJC_METACLASS_RO rather than
class_ro_t.

Pick-to: 6.2 6.3 5.15
Change-Id: I86192e91e55d8deb7e5c6790b327855fc0f7e594
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

mkspecs/features/data/mac/objc_namespace.sh

@@ -115,20 +115,25 @@ read_32bit_value() {
 inspect_binary() {
     inspect_mode="$1"
 
-    echo -n "🔎  Inspecting binary '$target', "
+    echo "🔎  Inspecting binary '$target'..."
     if [ ! -f "$target" ]; then
-        echo "target does not exist!"
+        echo " 💥  Target does not exist!"
         exit 1
     fi
 
     read -a mach_header <<< "$(otool -h "$target" -v | tail -n 1)"
     if [ "${mach_header[1]}" != "X86_64" ]; then
-        echo "binary is not 64-bit, only 64-bit binaries are supported!"
+        echo " 💥  Binary is not 64-bit, only 64-bit binaries are supported!"
         exit 1
     fi
 
     classnames_section="__objc_classname"
     classnames=$(otool -v -s __TEXT $classnames_section "$target" | tail -n +3)
+    if [ -z "$classnames" ]; then
+        echo " ℹ️  No Objective-C classes found in binary"
+        return 1
+    fi
+
     while read -a classname; do
         address=$(sanitize_address ${classname[0]})
         name=${classname[1]}
@@ -140,19 +145,23 @@ inspect_binary() {
     extra_classnames_file="$(mktemp -t ${classnames_section}_additions).S"
 
     if [ "$inspect_mode" == "inject_classnames" ]; then
-        echo "class names have not been namespaced, adding suffix '$suffix'..."
+        echo " ℹ️  Class names have not been namespaced, adding suffix '$suffix'..."
         printf ".section __TEXT,$classnames_section,cstring_literals,no_dead_strip\n" > $extra_classnames_file
     elif [ "$inspect_mode" == "patch_classes" ]; then
-        echo "found namespaced class names, updating class entries..."
+        echo " ℹ️  Found namespaced class names, updating class entries..."
+    fi
+
+    classes=$(otool -o -v "$target" | grep "OBJC_CLASS_RO\|OBJC_METACLASS_RO")
+    if [ -z "$classes" ]; then
+        echo " 💥  Failed to read class entries from binary"
+        exit 1
     fi
 
-    classes=$(otool -o -v "$target" | grep class_ro_t)
     while read -a class; do
         address="$(sanitize_address ${class[1]})"
-
         class_flags="0x$(read_32bit_value $address)"
         if [ -z "$class_flags" ]; then
-            echo " 💥  failed to read class flags for class at $address"
+            echo " 💥  Failed to read class flags for class at $address"
             continue
         fi
 
@@ -161,13 +170,13 @@ inspect_binary() {
         name_offset=$(($address + 24))
         classname_address="0x$(read_32bit_value $name_offset)"
         if [ -z "$classname_address" ]; then
-            echo " 💥  failed to read class name address for class at $address"
+            echo " 💥  Failed to read class name address for class at $address"
             continue
         fi
 
         classname=$(get_entry address_to_classname $classname_address)
         if [ -z "$classname" ]; then
-            echo " 💥  failed to resolve class name for address '$classname_address'"
+            echo " 💥  Failed to resolve class name for address '$classname_address'"
             continue
         fi
 
@@ -177,7 +186,7 @@ inspect_binary() {
             else
                 class_type="class"
             fi
-            echo " 🚽  skipping excluded $class_type '$classname'"
+            echo " 🚽  Skipping excluded $class_type '$classname'"
             continue
         fi
 
@@ -188,13 +197,13 @@ inspect_binary() {
                 continue
             fi
 
-            echo " 💉  injecting $classnames_section entry '$newclassname' for '$classname'"
+            echo " 💉  Injecting $classnames_section entry '$newclassname' for '$classname'"
             printf ".asciz \"$newclassname\"\n" >> $extra_classnames_file
 
         elif [ "$inspect_mode" == "patch_classes" ]; then
             newclassname_address=$(get_entry classname_to_address ${newclassname})
             if [ -z "$newclassname_address" ]; then
-                echo " 💥  failed to resolve class name address for class '$newclassname'"
+                echo " 💥  Failed to resolve class name address for class '$newclassname'"
                 continue
             fi
 
@@ -204,7 +213,7 @@ inspect_binary() {
                 class_type="class"
             fi
 
-            echo " 🔨  patching class_ro_t at $address ($class_type) from $classname_address ($classname) to $newclassname_address ($newclassname)"
+            echo " 🔨  Patching class_ro_t at $address ($class_type) from $classname_address ($classname) to $newclassname_address ($newclassname)"
             echo ${newclassname_address: -8} | rev | dd conv=swab 2>/dev/null | xxd -p -r -seek $name_offset -l 4 - "$target"
         fi
     done <<< "$classes"
@@ -214,6 +223,9 @@ echo "🔩  Linking binary using '$original_ld'..."
 link_binary
 
 inspect_binary inject_classnames
+if [ $? -ne 0 ]; then
+    exit
+fi
 
 echo "🔩  Re-linking binary with extra __objc_classname section..."
 link_binary $extra_classnames_file