1 files changed, 113 insertions, 0 deletions
diff --git a/include/llvm/IR/GetElementPtrTypeIterator.h b/include/llvm/IR/GetElementPtrTypeIterator.h
new file mode 100644
index 0000000..f2722d6
--- /dev/null
+++ b/include/llvm/IR/GetElementPtrTypeIterator.h
@@ -0,0 +1,113 @@
+//===- GetElementPtrTypeIterator.h ------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements an iterator for walking through the types indexed by
+// getelementptr instructions.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_IR_GETELEMENTPTRTYPEITERATOR_H
+#define LLVM_IR_GETELEMENTPTRTYPEITERATOR_H
+
+#include "llvm/IR/DerivedTypes.h"
+#include "llvm/IR/User.h"
+
+namespace llvm {
+  template<typename ItTy = User::const_op_iterator>
+  class generic_gep_type_iterator
+    : public std::iterator<std::forward_iterator_tag, Type *, ptrdiff_t> {
+    typedef std::iterator<std::forward_iterator_tag,
+                          Type *, ptrdiff_t> super;
+
+    ItTy OpIt;
+    Type *CurTy;
+    generic_gep_type_iterator() {}
+  public:
+
+    static generic_gep_type_iterator begin(Type *Ty, ItTy It) {
+      generic_gep_type_iterator I;
+      I.CurTy = Ty;
+      I.OpIt = It;
+      return I;
+    }
+    static generic_gep_type_iterator end(ItTy It) {
+      generic_gep_type_iterator I;
+      I.CurTy = 0;
+      I.OpIt = It;
+      return I;
+    }
+
+    bool operator==(const generic_gep_type_iterator& x) const {
+      return OpIt == x.OpIt;
+    }
+    bool operator!=(const generic_gep_type_iterator& x) const {
+      return !operator==(x);
+    }
+
+    Type *operator*() const {
+      return CurTy;
+    }
+
+    Type *getIndexedType() const {
+      CompositeType *CT = cast<CompositeType>(CurTy);
+      return CT->getTypeAtIndex(getOperand());
+    }
+
+    // This is a non-standard operator->.  It allows you to call methods on the
+    // current type directly.
+    Type *operator->() const { return operator*(); }
+
+    Value *getOperand() const { return *OpIt; }
+
+    generic_gep_type_iterator& operator++() {   // Preincrement
+      if (CompositeType *CT = dyn_cast<CompositeType>(CurTy)) {
+        CurTy = CT->getTypeAtIndex(getOperand());
+      } else {
+        CurTy = 0;
+      }
+      ++OpIt;
+      return *this;
+    }
+
+    generic_gep_type_iterator operator++(int) { // Postincrement
+      generic_gep_type_iterator tmp = *this; ++*this; return tmp;
+    }
+  };
+
+  typedef generic_gep_type_iterator<> gep_type_iterator;
+
+  inline gep_type_iterator gep_type_begin(const User *GEP) {
+    return gep_type_iterator::begin
+      (GEP->getOperand(0)->getType()->getScalarType(), GEP->op_begin()+1);
+  }
+  inline gep_type_iterator gep_type_end(const User *GEP) {
+    return gep_type_iterator::end(GEP->op_end());
+  }
+  inline gep_type_iterator gep_type_begin(const User &GEP) {
+    return gep_type_iterator::begin
+      (GEP.getOperand(0)->getType()->getScalarType(), GEP.op_begin()+1);
+  }
+  inline gep_type_iterator gep_type_end(const User &GEP) {
+    return gep_type_iterator::end(GEP.op_end());
+  }
+
+  template<typename T>
+  inline generic_gep_type_iterator<const T *>
+  gep_type_begin(Type *Op0, ArrayRef<T> A) {
+    return generic_gep_type_iterator<const T *>::begin(Op0, A.begin());
+  }
+
+  template<typename T>
+  inline generic_gep_type_iterator<const T *>
+  gep_type_end(Type * /*Op0*/, ArrayRef<T> A) {
+    return generic_gep_type_iterator<const T *>::end(A.end());
+  }
+} // end namespace llvm
+
+#endif