1 files changed, 81 insertions, 0 deletions
diff --git a/contrib/llvm/lib/IR/IntrinsicInst.cpp b/contrib/llvm/lib/IR/IntrinsicInst.cpp
new file mode 100644
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+++ b/contrib/llvm/lib/IR/IntrinsicInst.cpp
@@ -0,0 +1,81 @@
+//===-- InstrinsicInst.cpp - Intrinsic Instruction Wrappers ---------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements methods that make it really easy to deal with intrinsic
+// functions.
+//
+// All intrinsic function calls are instances of the call instruction, so these
+// are all subclasses of the CallInst class.  Note that none of these classes
+// has state or virtual methods, which is an important part of this gross/neat
+// hack working.
+// 
+// In some cases, arguments to intrinsics need to be generic and are defined as
+// type pointer to empty struct { }*.  To access the real item of interest the
+// cast instruction needs to be stripped away. 
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/IR/IntrinsicInst.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/GlobalVariable.h"
+#include "llvm/IR/Metadata.h"
+using namespace llvm;
+
+//===----------------------------------------------------------------------===//
+/// DbgInfoIntrinsic - This is the common base class for debug info intrinsics
+///
+
+static Value *CastOperand(Value *C) {
+  if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C))
+    if (CE->isCast())
+      return CE->getOperand(0);
+  return nullptr;
+}
+
+Value *DbgInfoIntrinsic::StripCast(Value *C) {
+  if (Value *CO = CastOperand(C)) {
+    C = StripCast(CO);
+  } else if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C)) {
+    if (GV->hasInitializer())
+      if (Value *CO = CastOperand(GV->getInitializer()))
+        C = StripCast(CO);
+  }
+  return dyn_cast<GlobalVariable>(C);
+}
+
+static Value *getValueImpl(Value *Op) {
+  auto *MD = cast<MetadataAsValue>(Op)->getMetadata();
+  if (auto *V = dyn_cast<ValueAsMetadata>(MD))
+    return V->getValue();
+
+  // When the value goes to null, it gets replaced by an empty MDNode.
+  assert(!cast<MDNode>(MD)->getNumOperands() && "Expected an empty MDNode");
+  return nullptr;
+}
+
+//===----------------------------------------------------------------------===//
+/// DbgDeclareInst - This represents the llvm.dbg.declare instruction.
+///
+
+Value *DbgDeclareInst::getAddress() const {
+  if (!getArgOperand(0))
+    return nullptr;
+
+  return getValueImpl(getArgOperand(0));
+}
+
+//===----------------------------------------------------------------------===//
+/// DbgValueInst - This represents the llvm.dbg.value instruction.
+///
+
+const Value *DbgValueInst::getValue() const {
+  return const_cast<DbgValueInst *>(this)->getValue();
+}
+
+Value *DbgValueInst::getValue() { return getValueImpl(getArgOperand(0)); }