From 3277b69d734b9c90b44ebde4ede005717e2c3b2e Mon Sep 17 00:00:00 2001
From: ed <ed@FreeBSD.org>
Date: Tue, 2 Jun 2009 17:52:33 +0000
Subject: Import LLVM, at r72732.

---
 lib/Transforms/Utils/ValueMapper.cpp | 143 +++++++++++++++++++++++++++++++++++
 1 file changed, 143 insertions(+)
 create mode 100644 lib/Transforms/Utils/ValueMapper.cpp

(limited to 'lib/Transforms/Utils/ValueMapper.cpp')

diff --git a/lib/Transforms/Utils/ValueMapper.cpp b/lib/Transforms/Utils/ValueMapper.cpp
new file mode 100644
index 0000000..20b676d
--- /dev/null
+++ b/lib/Transforms/Utils/ValueMapper.cpp
@@ -0,0 +1,143 @@
+//===- ValueMapper.cpp - Interface shared by lib/Transforms/Utils ---------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines the MapValue function, which is shared by various parts of
+// the lib/Transforms/Utils library.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Transforms/Utils/ValueMapper.h"
+#include "llvm/Constants.h"
+#include "llvm/GlobalValue.h"
+#include "llvm/Instruction.h"
+#include "llvm/MDNode.h"
+#include "llvm/ADT/SmallVector.h"
+using namespace llvm;
+
+Value *llvm::MapValue(const Value *V, ValueMapTy &VM) {
+  Value *&VMSlot = VM[V];
+  if (VMSlot) return VMSlot;      // Does it exist in the map yet?
+  
+  // NOTE: VMSlot can be invalidated by any reference to VM, which can grow the
+  // DenseMap.  This includes any recursive calls to MapValue.
+
+  // Global values do not need to be seeded into the ValueMap if they are using
+  // the identity mapping.
+  if (isa<GlobalValue>(V) || isa<InlineAsm>(V))
+    return VMSlot = const_cast<Value*>(V);
+
+  if (Constant *C = const_cast<Constant*>(dyn_cast<Constant>(V))) {
+    if (isa<ConstantInt>(C) || isa<ConstantFP>(C) ||
+        isa<ConstantPointerNull>(C) || isa<ConstantAggregateZero>(C) ||
+        isa<UndefValue>(C) || isa<MDString>(C))
+      return VMSlot = C;           // Primitive constants map directly
+    else if (ConstantArray *CA = dyn_cast<ConstantArray>(C)) {
+      for (User::op_iterator b = CA->op_begin(), i = b, e = CA->op_end();
+           i != e; ++i) {
+        Value *MV = MapValue(*i, VM);
+        if (MV != *i) {
+          // This array must contain a reference to a global, make a new array
+          // and return it.
+          //
+          std::vector<Constant*> Values;
+          Values.reserve(CA->getNumOperands());
+          for (User::op_iterator j = b; j != i; ++j)
+            Values.push_back(cast<Constant>(*j));
+          Values.push_back(cast<Constant>(MV));
+          for (++i; i != e; ++i)
+            Values.push_back(cast<Constant>(MapValue(*i, VM)));
+          return VM[V] = ConstantArray::get(CA->getType(), Values);
+        }
+      }
+      return VM[V] = C;
+
+    } else if (ConstantStruct *CS = dyn_cast<ConstantStruct>(C)) {
+      for (User::op_iterator b = CS->op_begin(), i = b, e = CS->op_end();
+           i != e; ++i) {
+        Value *MV = MapValue(*i, VM);
+        if (MV != *i) {
+          // This struct must contain a reference to a global, make a new struct
+          // and return it.
+          //
+          std::vector<Constant*> Values;
+          Values.reserve(CS->getNumOperands());
+          for (User::op_iterator j = b; j != i; ++j)
+            Values.push_back(cast<Constant>(*j));
+          Values.push_back(cast<Constant>(MV));
+          for (++i; i != e; ++i)
+            Values.push_back(cast<Constant>(MapValue(*i, VM)));
+          return VM[V] = ConstantStruct::get(CS->getType(), Values);
+        }
+      }
+      return VM[V] = C;
+
+    } else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
+      std::vector<Constant*> Ops;
+      for (User::op_iterator i = CE->op_begin(), e = CE->op_end(); i != e; ++i)
+        Ops.push_back(cast<Constant>(MapValue(*i, VM)));
+      return VM[V] = CE->getWithOperands(Ops);
+    } else if (ConstantVector *CP = dyn_cast<ConstantVector>(C)) {
+      for (User::op_iterator b = CP->op_begin(), i = b, e = CP->op_end();
+           i != e; ++i) {
+        Value *MV = MapValue(*i, VM);
+        if (MV != *i) {
+          // This vector value must contain a reference to a global, make a new
+          // vector constant and return it.
+          //
+          std::vector<Constant*> Values;
+          Values.reserve(CP->getNumOperands());
+          for (User::op_iterator j = b; j != i; ++j)
+            Values.push_back(cast<Constant>(*j));
+          Values.push_back(cast<Constant>(MV));
+          for (++i; i != e; ++i)
+            Values.push_back(cast<Constant>(MapValue(*i, VM)));
+          return VM[V] = ConstantVector::get(Values);
+        }
+      }
+      return VM[V] = C;
+      
+    } else if (MDNode *N = dyn_cast<MDNode>(C)) {
+      for (MDNode::const_elem_iterator b = N->elem_begin(), i = b,
+             e = N->elem_end(); i != e; ++i) {
+        if (!*i) continue;
+
+        Value *MV = MapValue(*i, VM);
+        if (MV != *i) {
+          // This MDNode must contain a reference to a global, make a new MDNode
+          // and return it.
+	  SmallVector<Value*, 8> Values;
+          Values.reserve(N->getNumElements());
+          for (MDNode::const_elem_iterator j = b; j != i; ++j)
+            Values.push_back(*j);
+          Values.push_back(MV);
+          for (++i; i != e; ++i)
+            Values.push_back(MapValue(*i, VM));
+          return VM[V] = MDNode::get(Values.data(), Values.size());
+        }
+      }
+      return VM[V] = C;
+
+    } else {
+      assert(0 && "Unknown type of constant!");
+    }
+  }
+
+  return 0;
+}
+
+/// RemapInstruction - Convert the instruction operands from referencing the
+/// current values into those specified by ValueMap.
+///
+void llvm::RemapInstruction(Instruction *I, ValueMapTy &ValueMap) {
+  for (User::op_iterator op = I->op_begin(), E = I->op_end(); op != E; ++op) {
+    Value *V = MapValue(*op, ValueMap);
+    assert(V && "Referenced value not in value map!");
+    *op = V;
+  }
+}
-- 
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