Return iterator from BasicBlock::eraseFromParent

Summary:
Same as the last patch, but for BasicBlock
(Requires same code movement)

Reviewers: chandlerc

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D8801

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233992 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/IR/BasicBlock.h

@@ -28,6 +28,23 @@ class LandingPadInst;
 class TerminatorInst;
 class LLVMContext;
 class BlockAddress;
+class Function;
+
+// Traits for intrusive list of basic blocks...
+template<> struct ilist_traits<BasicBlock>
+  : public SymbolTableListTraits<BasicBlock, Function> {
+
+  BasicBlock *createSentinel() const;
+  static void destroySentinel(BasicBlock*) {}
+
+  BasicBlock *provideInitialHead() const { return createSentinel(); }
+  BasicBlock *ensureHead(BasicBlock*) const { return createSentinel(); }
+  static void noteHead(BasicBlock*, BasicBlock*) {}
+
+  static ValueSymbolTable *getSymTab(Function *ItemParent);
+private:
+  mutable ilist_half_node<BasicBlock> Sentinel;
+};
 
 
 /// \brief LLVM Basic Block Representation
@@ -151,7 +168,9 @@ public:
   void removeFromParent();
 
   /// \brief Unlink 'this' from the containing function and delete it.
-  void eraseFromParent();
+  ///
+  // \returns an iterator pointing to the element after the erased one.
+  iplist<BasicBlock>::iterator eraseFromParent();
 
   /// \brief Unlink this basic block from its current function and insert it
   /// into the function that \p MovePos lives in, right before \p MovePos.
@@ -307,6 +326,12 @@ private:
   }
 };
 
+// createSentinel is used to get hold of the node that marks the end of the
+// list... (same trick used here as in ilist_traits<Instruction>)
+inline BasicBlock *ilist_traits<BasicBlock>::createSentinel() const {
+    return static_cast<BasicBlock*>(&Sentinel);
+}
+
 // Create wrappers for C Binding types (see CBindingWrapping.h).
 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(BasicBlock, LLVMBasicBlockRef)
 

include/llvm/IR/Function.h

@@ -31,26 +31,6 @@ namespace llvm {
 class FunctionType;
 class LLVMContext;
 
-// Traits for intrusive list of basic blocks...
-template<> struct ilist_traits<BasicBlock>
-  : public SymbolTableListTraits<BasicBlock, Function> {
-
-  // createSentinel is used to get hold of the node that marks the end of the
-  // list... (same trick used here as in ilist_traits<Instruction>)
-  BasicBlock *createSentinel() const {
-    return static_cast<BasicBlock*>(&Sentinel);
-  }
-  static void destroySentinel(BasicBlock*) {}
-
-  BasicBlock *provideInitialHead() const { return createSentinel(); }
-  BasicBlock *ensureHead(BasicBlock*) const { return createSentinel(); }
-  static void noteHead(BasicBlock*, BasicBlock*) {}
-
-  static ValueSymbolTable *getSymTab(Function *ItemParent);
-private:
-  mutable ilist_half_node<BasicBlock> Sentinel;
-};
-
 template<> struct ilist_traits<Argument>
   : public SymbolTableListTraits<Argument, Function> {
 

lib/IR/BasicBlock.cpp

@@ -94,8 +94,8 @@ void BasicBlock::removeFromParent() {
   getParent()->getBasicBlockList().remove(this);
 }
 
-void BasicBlock::eraseFromParent() {
+iplist<BasicBlock>::iterator BasicBlock::eraseFromParent() {
-  getParent()->getBasicBlockList().erase(this);
+  return getParent()->getBasicBlockList().erase(this);
 }
 
 /// Unlink this basic block from its current function and