From df43d25fd366d96cd7af1ead8938ed0d2394e2fb Mon Sep 17 00:00:00 2001
From: Enrico Granata <egranata@apple.com>
Date: Thu, 1 Sep 2016 18:09:01 +0000
Subject: Change the formula for tagged NSIndexPath data formatting

Fixes rdar://25192935

llvm-svn: 280389
---
 lldb/source/Plugins/Language/ObjC/NSIndexPath.cpp | 40 ++++++++++++++++-------
 1 file changed, 29 insertions(+), 11 deletions(-)

(limited to 'lldb/source/Plugins/Language/ObjC')

diff --git a/lldb/source/Plugins/Language/ObjC/NSIndexPath.cpp b/lldb/source/Plugins/Language/ObjC/NSIndexPath.cpp
index 0c8a54d76df..0bebaca256b 100644
--- a/lldb/source/Plugins/Language/ObjC/NSIndexPath.cpp
+++ b/lldb/source/Plugins/Language/ObjC/NSIndexPath.cpp
@@ -26,6 +26,18 @@ using namespace lldb;
 using namespace lldb_private;
 using namespace lldb_private::formatters;
 
+static constexpr size_t
+PACKED_INDEX_SHIFT_64(size_t i)
+{
+    return (60 - (13 * (4-i)));
+}
+
+static constexpr size_t
+PACKED_INDEX_SHIFT_32(size_t i)
+{
+    return (32 - (13 * (2-i)));
+}
+
 class NSIndexPathSyntheticFrontEnd : public SyntheticChildrenFrontEnd
 {
 public:
@@ -284,23 +296,29 @@ protected:
             std::pair<uint64_t, bool>
             _indexAtPositionForInlinePayload(size_t pos)
             {
+                static const uint64_t PACKED_INDEX_MASK = ((1 << 13) - 1);
                 if (m_ptr_size == 8)
                 {
-                    switch (pos) {
-                        case 5: return {((m_indexes >> 51) & 0x1ff),true};
-                        case 4: return {((m_indexes >> 42) & 0x1ff),true};
-                        case 3: return {((m_indexes >> 33) & 0x1ff),true};
-                        case 2: return {((m_indexes >> 24) & 0x1ff),true};
-                        case 1: return {((m_indexes >> 15) & 0x1ff),true};
-                        case 0: return {((m_indexes >>  6) & 0x1ff),true};
+                    switch (pos)
+                    {
+                        case 3:
+                        case 2:
+                        case 1:
+                        case 0:
+                            return {(m_indexes >> PACKED_INDEX_SHIFT_64(pos)) & PACKED_INDEX_MASK,true};
+                        default:
+                            return {0,false};
                     }
                 }
                 else
                 {
-                    switch (pos) {
-                        case 2: return {((m_indexes >> 23) & 0x1ff),true};
-                        case 1: return {((m_indexes >> 14) & 0x1ff),true};
-                        case 0: return {((m_indexes >>  5) & 0x1ff),true};
+                    switch (pos)
+                    {
+                        case 0:
+                        case 1:
+                            return {(m_indexes >> PACKED_INDEX_SHIFT_32(pos)) & PACKED_INDEX_MASK,true};
+                        default:
+                            return {0,false};
                     }
                 }
                 return {0,false};
-- 
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