From 26e25b3bf0c4f423a5a06263ea060643bc788909 Mon Sep 17 00:00:00 2001
From: Ted Kremenek <kremenek@apple.com>
Date: Tue, 6 Nov 2007 19:49:16 +0000
Subject: [PATCH] Added support for processing abbreviations in the
 Deserializer. Added some #ifdef-controlled messages for debugging
 backpatching.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43771 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Bitcode/Deserialize.h |  2 +-
 lib/Bitcode/Reader/Deserialize.cpp | 21 +++++++++++++++++++--
 2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/include/llvm/Bitcode/Deserialize.h b/include/llvm/Bitcode/Deserialize.h
index 0398e434ca4..283e6035c79 100644
--- a/include/llvm/Bitcode/Deserialize.h
+++ b/include/llvm/Bitcode/Deserialize.h
@@ -156,9 +156,9 @@ public:
   
   bool AtEnd();
 
+  bool inRecord();
 private:
   void ReadRecord();  
-  bool inRecord();
   uintptr_t ReadInternalRefPtr();
   
   static inline bool HasFinalPtr(MapTy::value_type& V) {
diff --git a/lib/Bitcode/Reader/Deserialize.cpp b/lib/Bitcode/Reader/Deserialize.cpp
index ef4e4f7e000..5642f37fac5 100644
--- a/lib/Bitcode/Reader/Deserialize.cpp
+++ b/lib/Bitcode/Reader/Deserialize.cpp
@@ -13,6 +13,10 @@
 
 #include "llvm/Bitcode/Deserialize.h"
 
+#ifdef DEBUG_BACKPATCH
+#include "llvm/Support/Streams.h"
+#endif
+
 using namespace llvm;
 
 Deserializer::Deserializer(BitstreamReader& stream)
@@ -71,6 +75,11 @@ void Deserializer::ReadRecord() {
       continue;
     }
     
+    if (Code == bitc::DEFINE_ABBREV) {
+      Stream.ReadAbbrevRecord();
+      continue;
+    }
+    
     break;
   }
   
@@ -136,6 +145,10 @@ void Deserializer::RegisterPtr(unsigned PtrId, const void* Ptr) {
   
   assert (!HasFinalPtr(E) && "Pointer already registered.");
 
+#ifdef DEBUG_BACKPATCH
+  llvm::cerr << "RegisterPtr: " << PtrId << " => " << Ptr << "\n";
+#endif 
+  
   SetPtr(E,Ptr);
 }
 
@@ -145,8 +158,12 @@ void Deserializer::ReadUIntPtr(uintptr_t& PtrRef) {
   if (PtrId == 0) {
     PtrRef = 0;
     return;
-  }  
-
+  }
+  
+#ifdef DEBUG_BACKPATCH
+  llvm::cerr << "ReadUintPtr: " << PtrId << "\n";
+#endif
+  
   MapTy::value_type& E = BPatchMap.FindAndConstruct(BPKey(PtrId));
   
   if (HasFinalPtr(E))
-- 
2.34.1