Implemented shl, shl, & load instructions

llvm-svn: 161

1 files changed, 47 insertions, 0 deletions

diff --git a/llvm/lib/VMCore/iMemory.cpp b/llvm/lib/VMCore/iMemory.cpp
new file mode 100644
index 00000000000..41c14b04d55
--- /dev/null
+++ b/llvm/lib/VMCore/iMemory.cpp
@@ -0,0 +1,47 @@
+//===-- iMemory.cpp - Implement Memory instructions --------------*- C++ -*--=//
+//
+// This file implements the various memory related classes defined in iMemory.h
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/iMemory.h"
+#include "llvm/ConstPoolVals.h"
+
+const Type *LoadInst::getIndexedType(const Type *Ptr, 
+				     const vector<ConstPoolVal*> &Idx) {
+  if (!Ptr->isPointerType()) return 0;   // Type isn't a pointer type!
+ 
+  // Get the type pointed to...
+  Ptr = ((const PointerType*)Ptr)->getValueType();
+
+  if (Ptr->isStructType()) {
+    unsigned CurIDX = 0;
+    while (Ptr->isStructType()) {
+      if (Idx.size() == CurIDX) return 0;       // Can't load a whole structure!
+      if (Idx[CurIDX]->getType() != Type::UByteTy) return 0; // Illegal idx
+      unsigned NextIdx = ((ConstPoolUInt*)Idx[CurIDX++])->getValue();
+      
+      const StructType *ST = (const StructType *)Ptr;
+      Ptr = ST->getElementTypes()[NextIdx];
+    }
+    return Ptr;
+  } else if (Ptr->isArrayType()) {
+    assert(0 && "Loading from arrays not implemented yet!");
+  } else {
+    return (Idx.size() == 0) ? Ptr : 0;  // Load directly through ptr
+  }
+}
+
+
+LoadInst::LoadInst(Value *Ptr, const vector<ConstPoolVal*> &Idx,
+		   const string &Name = "")
+  : Instruction(getIndexedType(Ptr->getType(), Idx), Load, Name) {
+  assert(getIndexedType(Ptr->getType(), Idx) && "Load operands invalid!");
+  assert(Ptr->getType()->isPointerType() && "Can't free nonpointer!");
+  Operands.reserve(1+Idx.size());
+  Operands.push_back(Use(Ptr, this));
+
+  for (unsigned i = 0, E = Idx.size(); i != E; ++i)
+    Operands.push_back(Use(Idx[i], this));
+}
+