Fix various iOS treemap inaccuracies (#473)

Author: trevor-e

src/launchpad/size/analyzers/apple.py

@@ -563,8 +563,19 @@ def _extract_segments_info(self, binary: lief.MachO.Binary) -> List[SegmentInfo]
 
                     section_infos: List[SectionInfo] = []
                     for section in command.sections:
+                        if section.segment.file_size == 0:
+                            logger.warning(
+                                "size.apple.skip_segment.zero_file_size",
+                                extra={
+                                    "segment_name": segment_name,
+                                    "section_name": section.name,
+                                },
+                            )
+                            continue
+
                         section_name = self._parse_lief_name(section.name)
-                        section_infos.append(SectionInfo(name=section_name, size=section.size))
+                        is_zerofill = section.type == lief.MachO.Section.TYPE.ZEROFILL
+                        section_infos.append(SectionInfo(name=section_name, size=section.size, is_zerofill=is_zerofill))
 
                     segments.append(
                         SegmentInfo(

src/launchpad/size/models/apple.py

@@ -116,6 +116,7 @@ class SectionInfo:
 
     name: str
     size: int
+    is_zerofill: bool  # True if this section doesn't occupy file space (e.g., __bss)
 
 
 @dataclass

src/launchpad/size/models/common.py

@@ -15,7 +15,7 @@
 # so we can update treemap logic and not give users confusing diffs.
 # Patch versions are ignored.
 ANDROID_ANALYSIS_VERSION = "1.0.0"
-APPLE_ANALYSIS_VERSION = "1.1.0"
+APPLE_ANALYSIS_VERSION = "1.2.0"
 
 
 class BaseAppInfo(BaseModel):

src/launchpad/size/symbols/swift_aggregator.py

@@ -32,13 +32,9 @@ def is_swift_symbol(mangled_name: str) -> bool:
         Includes:
         - _$s: Modern Swift mangling
         - _Tt: Older Swift mangling
-        - __IVARS__Tt: ObjC runtime metadata for Swift classes
-        - __DATA__Tt: Data section symbols for Swift types
+        - __Tt: Swift classes exposed to ObjC with metadata
         """
-        if mangled_name.startswith("_$s") or mangled_name.startswith("_Tt"):
-            return True
-        # Swift classes exposed to ObjC have metadata with Swift mangling
-        if "__Tt" in mangled_name:
+        if mangled_name.startswith("_$s") or mangled_name.startswith("_Tt") or mangled_name.startswith("__Tt"):
             return True
         return False