From 9e60d8dbdc3f335a938331e7974808ff77d5e821 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Thu, 5 May 2005 22:21:19 +0000
Subject: [PATCH] add support for undef values of opaque type, addressing PR541

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21701 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Bytecode/Writer/SlotCalculator.cpp | 19 ++++++++++---------
 lib/Bytecode/Writer/Writer.cpp         |  6 +++---
 2 files changed, 13 insertions(+), 12 deletions(-)

diff --git a/lib/Bytecode/Writer/SlotCalculator.cpp b/lib/Bytecode/Writer/SlotCalculator.cpp
index 8ac2e3f9b0a..c051e315a0b 100644
--- a/lib/Bytecode/Writer/SlotCalculator.cpp
+++ b/lib/Bytecode/Writer/SlotCalculator.cpp
@@ -121,8 +121,8 @@ void SlotCalculator::processModule() {
 
   // Add all of the global variables to the value table...
   //
-  for (Module::const_global_iterator I = TheModule->global_begin(), E = TheModule->global_end();
-       I != E; ++I)
+  for (Module::const_global_iterator I = TheModule->global_begin(),
+         E = TheModule->global_end(); I != E; ++I)
     getOrCreateSlot(I);
 
   // Scavenge the types out of the functions, then add the functions themselves
@@ -134,8 +134,8 @@ void SlotCalculator::processModule() {
 
   // Add all of the module level constants used as initializers
   //
-  for (Module::const_global_iterator I = TheModule->global_begin(), E = TheModule->global_end();
-       I != E; ++I)
+  for (Module::const_global_iterator I = TheModule->global_begin(),
+         E = TheModule->global_end(); I != E; ++I)
     if (I->hasInitializer())
       getOrCreateSlot(I->getInitializer());
 
@@ -388,8 +388,8 @@ void SlotCalculator::purgeFunction() {
   SC_DEBUG("end purgeFunction!\n");
 }
 
-static inline bool hasNullValue(unsigned TyID) {
-  return TyID != Type::LabelTyID && TyID != Type::VoidTyID;
+static inline bool hasNullValue(const Type *Ty) {
+  return Ty != Type::LabelTy && Ty != Type::VoidTy && !isa<OpaqueType>(Ty);
 }
 
 /// getOrCreateCompactionTableSlot - This method is used to build up the initial
@@ -413,7 +413,7 @@ unsigned SlotCalculator::getOrCreateCompactionTableSlot(const Value *V) {
 
   // Make sure to insert the null entry if the thing we are inserting is not a
   // null constant.
-  if (TyPlane.empty() && hasNullValue(V->getType()->getTypeID())) {
+  if (TyPlane.empty() && hasNullValue(V->getType())) {
     Value *ZeroInitializer = Constant::getNullValue(V->getType());
     if (V != ZeroInitializer) {
       TyPlane.push_back(ZeroInitializer);
@@ -461,7 +461,8 @@ void SlotCalculator::buildCompactionTable(const Function *F) {
   }
 
   // Next, include any types used by function arguments.
-  for (Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end(); I != E; ++I)
+  for (Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end();
+       I != E; ++I)
     getOrCreateCompactionTableSlot(I->getType());
 
   // Next, find all of the types and values that are referred to by the
@@ -829,7 +830,7 @@ int SlotCalculator::doInsertValue(const Value *D) {
 
   // If this is the first value to get inserted into the type plane, make sure
   // to insert the implicit null value...
-  if (Table[Ty].empty() &&  hasNullValue(Ty)) {
+  if (Table[Ty].empty() && hasNullValue(Typ)) {
     Value *ZeroInitializer = Constant::getNullValue(Typ);
 
     // If we are pushing zeroinit, it will be handled below.
diff --git a/lib/Bytecode/Writer/Writer.cpp b/lib/Bytecode/Writer/Writer.cpp
index cdda1c7410c..d4f231b13d5 100644
--- a/lib/Bytecode/Writer/Writer.cpp
+++ b/lib/Bytecode/Writer/Writer.cpp
@@ -843,8 +843,8 @@ void BytecodeWriter::outputConstantsInPlane(const std::vector<const Value*>
   }
 }
 
-static inline bool hasNullValue(unsigned TyID) {
-  return TyID != Type::LabelTyID && TyID != Type::VoidTyID;
+static inline bool hasNullValue(const Type *Ty) {
+  return Ty != Type::LabelTy && Ty != Type::VoidTy && !isa<OpaqueType>(Ty);
 }
 
 void BytecodeWriter::outputConstants(bool isFunction) {
@@ -867,7 +867,7 @@ void BytecodeWriter::outputConstants(bool isFunction) {
       if (isFunction)                  // Don't re-emit module constants
         ValNo += Table.getModuleLevel(pno);
 
-      if (hasNullValue(pno)) {
+      if (hasNullValue(Plane[0]->getType())) {
         // Skip zero initializer
         if (ValNo == 0)
           ValNo = 1;