Vendor import of llvm trunk r178860:vendor/llvm/llvm-trunk-r178860

http://llvm.org/svn/llvm-project/llvm/trunk@178860

1 files changed, 90 insertions, 0 deletions

diff --git a/lib/IR/User.cpp b/lib/IR/User.cpp
new file mode 100644
index 000000000000..940682826acc
--- /dev/null
+++ b/lib/IR/User.cpp
@@ -0,0 +1,90 @@
+//===-- User.cpp - Implement the User class -------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/IR/User.h"
+#include "llvm/IR/Constant.h"
+#include "llvm/IR/GlobalValue.h"
+#include "llvm/IR/Operator.h"
+
+namespace llvm {
+
+//===----------------------------------------------------------------------===//
+//                                 User Class
+//===----------------------------------------------------------------------===//
+
+void User::anchor() {}
+
+// replaceUsesOfWith - Replaces all references to the "From" definition with
+// references to the "To" definition.
+//
+void User::replaceUsesOfWith(Value *From, Value *To) {
+  if (From == To) return;   // Duh what?
+
+  assert((!isa<Constant>(this) || isa<GlobalValue>(this)) &&
+         "Cannot call User::replaceUsesOfWith on a constant!");
+
+  for (unsigned i = 0, E = getNumOperands(); i != E; ++i)
+    if (getOperand(i) == From) {  // Is This operand is pointing to oldval?
+      // The side effects of this setOperand call include linking to
+      // "To", adding "this" to the uses list of To, and
+      // most importantly, removing "this" from the use list of "From".
+      setOperand(i, To); // Fix it now...
+    }
+}
+
+//===----------------------------------------------------------------------===//
+//                         User allocHungoffUses Implementation
+//===----------------------------------------------------------------------===//
+
+Use *User::allocHungoffUses(unsigned N) const {
+  // Allocate the array of Uses, followed by a pointer (with bottom bit set) to
+  // the User.
+  size_t size = N * sizeof(Use) + sizeof(Use::UserRef);
+  Use *Begin = static_cast<Use*>(::operator new(size));
+  Use *End = Begin + N;
+  (void) new(End) Use::UserRef(const_cast<User*>(this), 1);
+  return Use::initTags(Begin, End);
+}
+
+//===----------------------------------------------------------------------===//
+//                         User operator new Implementations
+//===----------------------------------------------------------------------===//
+
+void *User::operator new(size_t s, unsigned Us) {
+  void *Storage = ::operator new(s + sizeof(Use) * Us);
+  Use *Start = static_cast<Use*>(Storage);
+  Use *End = Start + Us;
+  User *Obj = reinterpret_cast<User*>(End);
+  Obj->OperandList = Start;
+  Obj->NumOperands = Us;
+  Use::initTags(Start, End);
+  return Obj;
+}
+
+//===----------------------------------------------------------------------===//
+//                         User operator delete Implementation
+//===----------------------------------------------------------------------===//
+
+void User::operator delete(void *Usr) {
+  User *Start = static_cast<User*>(Usr);
+  Use *Storage = static_cast<Use*>(Usr) - Start->NumOperands;
+  // If there were hung-off uses, they will have been freed already and
+  // NumOperands reset to 0, so here we just free the User itself.
+  ::operator delete(Storage);
+}
+
+//===----------------------------------------------------------------------===//
+//                             Operator Class
+//===----------------------------------------------------------------------===//
+
+Operator::~Operator() {
+  llvm_unreachable("should never destroy an Operator");
+}
+
+} // End llvm namespace