From 277b4e4a9b490756149877661457377d178038b0 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Mon, 5 Nov 2001 19:43:10 +0000
Subject: [PATCH] Don't print spurious linking warnings about methods that are
 never used. Cleanup ExprTypeConvert a bit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1141 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/ExprTypeConvert.cpp         | 18 ++++----
 lib/Transforms/IPO/DeadTypeElimination.cpp | 49 +++++++++++++---------
 2 files changed, 36 insertions(+), 31 deletions(-)

diff --git a/lib/Transforms/ExprTypeConvert.cpp b/lib/Transforms/ExprTypeConvert.cpp
index 5c94f8c729b..8f1af88cb78 100644
--- a/lib/Transforms/ExprTypeConvert.cpp
+++ b/lib/Transforms/ExprTypeConvert.cpp
@@ -403,12 +403,11 @@ void ConvertUsersType(Value *V, Value *NewVal, ValueMapCache &VMC) {
       // loops.  Note that we cannot use DCE because DCE won't remove a store
       // instruction, for example.
       //
-      BasicBlock::iterator It = find(BB->begin(), BB->end(), I);
-      assert(It != BB->end() && "Instruction no longer in basic block??");
 #ifdef DEBUG_EXPR_CONVERT
       cerr << "DELETING: " << (void*)I << " " << I;
 #endif
-      delete BB->getInstList().remove(It);
+      BB->getInstList().remove(I);
+      delete I;
     }
 }
 
@@ -550,12 +549,11 @@ static void ConvertOperandToType(User *U, Value *OldVal, Value *NewVal,
       // loops.  Note that we cannot use DCE because DCE won't remove a store
       // instruction, for example.
       //
-      BasicBlock::iterator It = find(BIL.begin(), BIL.end(), I);
-      assert(It != BIL.end() && "Instruction no longer in basic block??");
 #ifdef DEBUG_EXPR_CONVERT
       cerr << "DELETING: " << (void*)I << " " << I;
 #endif
-      delete BIL.remove(It);
+      BIL.remove(I);
+      delete I;
     } else {
       for (Value::use_iterator UI = I->use_begin(), UE = I->use_end();
            UI != UE; ++UI)
@@ -575,15 +573,13 @@ ValueHandle::~ValueHandle() {
     // instruction, for example.
     //
     Instruction *I = cast<Instruction>(V);
-    BasicBlock *BB = I->getParent();
-    assert(BB && "Inst not in basic block!");
+    assert(I->getParent() && "Inst not in basic block!");
 
-    BasicBlock::iterator It = find(BB->begin(), BB->end(), I);
-    assert(It != BB->end() && "Instruction no longer in basic block??");
 #ifdef DEBUG_EXPR_CONVERT
     cerr << "VH DELETING: " << (void*)I << " " << I;
 #endif
-    delete BB->getInstList().remove(It);
+    I->getParent()->getInstList().remove(I);
+    delete I;
   } else {
 #ifdef DEBUG_EXPR_CONVERT
     cerr << "VH RELEASING: " << Operands[0];
diff --git a/lib/Transforms/IPO/DeadTypeElimination.cpp b/lib/Transforms/IPO/DeadTypeElimination.cpp
index 43a286aa15d..d2d9e71ae61 100644
--- a/lib/Transforms/IPO/DeadTypeElimination.cpp
+++ b/lib/Transforms/IPO/DeadTypeElimination.cpp
@@ -105,29 +105,38 @@ bool CleanupGCCOutput::PatchUpMethodReferences(Module *M) {
   for (map<string, vector<Method*> >::iterator I = Methods.begin(), 
          E = Methods.end(); I != E; ++I) {
     vector<Method*> &Methods = I->second;
-    if (Methods.size() > 1) {         // Found a multiply defined method.
-      Method *Implementation = 0;     // Find the implementation
-      Method *Concrete = 0;
-      for (unsigned i = 0; i < Methods.size(); ++i) {
-        // TODO: Ignore methods that are never USED!  DCE them.
-        // Remove their name. this should fix a majority of problems here.
-
-        if (!Methods[i]->isExternal()) {  // Found an implementation
-          assert(Implementation == 0 && "Multiple definitions of the same"
-                 " method. Case not handled yet!");
-          Implementation = Methods[i];
-        }
-
-        if (!Methods[i]->getMethodType()->isVarArg() ||
-            Methods[i]->getMethodType()->getParamTypes().size()) {
-          if (Concrete) {  // Found two different methods types.  Can't choose
-            Concrete = 0;
-            break;
-          }
-          Concrete = Methods[i];
+    Method *Implementation = 0;     // Find the implementation
+    Method *Concrete = 0;
+    for (unsigned i = 0; i < Methods.size(); ) {
+      if (!Methods[i]->isExternal()) {  // Found an implementation
+        assert(Implementation == 0 && "Multiple definitions of the same"
+               " method. Case not handled yet!");
+        Implementation = Methods[i];
+      } else {
+        // Ignore methods that are never used so they don't cause spurious
+        // warnings... here we will actually DCE the function so that it isn't
+        // used later.
+        //
+        if (Methods[i]->use_size() == 0) {
+          M->getMethodList().remove(Methods[i]);
+          delete Methods[i];
+          Methods.erase(Methods.begin()+i);
+          Changed = true;
         }
       }
+      
+      if (Methods[i] && (!Methods[i]->getMethodType()->isVarArg() ||
+                         Methods[i]->getMethodType()->getParamTypes().size())) {
+        if (Concrete) {  // Found two different methods types.  Can't choose
+          Concrete = 0;
+          break;
+        }
+        Concrete = Methods[i];
+      }
+      ++i;
+    }
 
+    if (Methods.size() > 1) {         // Found a multiply defined method.
       // We should find exactly one non-vararg method definition, which is
       // probably the implementation.  Change all of the method definitions
       // and uses to use it instead.