MachObjectWriter: Fix calculation of segmentFileSize

filipnavara · filipnavara · commit 3bbbd9c229a3 · 2026-02-27T20:42:39.000+01:00
diff --git a/src/coreclr/tools/Common/Compiler/ObjectWriter/MachObjectWriter.cs b/src/coreclr/tools/Common/Compiler/ObjectWriter/MachObjectWriter.cs
@@ -137,6 +137,7 @@ private void LayoutSections(bool recordFinalLayout, ref uint fileOffset, out uin
         {
             ulong virtualAddress = 0;
             byte sectionIndex = 1;
+            uint initialFileOffset = fileOffset;
 
             segmentFileSize = 0;
             segmentSize = 0;
@@ -151,7 +152,7 @@ private void LayoutSections(bool recordFinalLayout, ref uint fileOffset, out uin
                 {
                     section.FileOffset = fileOffset;
                     fileOffset += (uint)section.Size;
-                    segmentFileSize = Math.Max(segmentFileSize, fileOffset);
+                    segmentFileSize = Math.Max(segmentFileSize, fileOffset - initialFileOffset);
                 }
                 else
                 {

Original file line number	Diff line number	Diff line change
`@@ -137,6 +137,7 @@ private void LayoutSections(bool recordFinalLayout, ref uint fileOffset, out uin`
`137`	`137`	`{`
`138`	`138`	`ulong virtualAddress = 0;`
`139`	`139`	`byte sectionIndex = 1;`
	`140`	`+ uint initialFileOffset = fileOffset;`
`140`	`141`
`141`	`142`	`segmentFileSize = 0;`
`142`	`143`	`segmentSize = 0;`
`@@ -151,7 +152,7 @@ private void LayoutSections(bool recordFinalLayout, ref uint fileOffset, out uin`
`151`	`152`	`{`
`152`	`153`	`section.FileOffset = fileOffset;`
`153`	`154`	`fileOffset += (uint)section.Size;`
`154`		`- segmentFileSize = Math.Max(segmentFileSize, fileOffset);`
	`155`	`+ segmentFileSize = Math.Max(segmentFileSize, fileOffset - initialFileOffset);`
`155`	`156`	`}`
`156`	`157`	`else`
`157`	`158`	`{`