X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=lib%2FCodeGen%2FPseudoSourceValue.cpp;h=5e86e5a9447e31afc8effd9877c0c1bce07af828;hb=3181c505348bbfb28623b5fbb8bbb166814545e7;hp=da9af49f944aa693783c98698fef06de179f4c59;hpb=f38dc192dd378903048efbadb95b75cf41abfb63;p=oota-llvm.git

diff --git a/lib/CodeGen/PseudoSourceValue.cpp b/lib/CodeGen/PseudoSourceValue.cpp
index da9af49f944..5e86e5a9447 100644
--- a/lib/CodeGen/PseudoSourceValue.cpp
+++ b/lib/CodeGen/PseudoSourceValue.cpp
@@ -11,23 +11,124 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "llvm/CodeGen/MachineFrameInfo.h"
 #include "llvm/CodeGen/PseudoSourceValue.h"
 #include "llvm/DerivedTypes.h"
+#include "llvm/LLVMContext.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/System/Mutex.h"
+#include <map>
+using namespace llvm;
 
-namespace llvm {
-  const PseudoSourceValue PseudoSourceValue::FPRel("FPRel");
-  const PseudoSourceValue PseudoSourceValue::SPRel("SPRel");
-  const PseudoSourceValue PseudoSourceValue::GPRel("GPRel");
-  const PseudoSourceValue PseudoSourceValue::TPRel("TPRel");
-  const PseudoSourceValue PseudoSourceValue::CPRel("CPRel");
-  const PseudoSourceValue PseudoSourceValue::JTRel("JTRel");
-
-  PseudoSourceValue::PseudoSourceValue(const char *_name) :
-    Value(PointerType::getUnqual(Type::Int8Ty), PseudoSourceValueVal),
-          name(_name) {
-  }
+namespace {
+struct PSVGlobalsTy {
+  // PseudoSourceValues are immutable so don't need locking.
+  const PseudoSourceValue PSVs[4];
+  sys::Mutex Lock;  // Guards FSValues, but not the values inside it.
+  std::map<int, const PseudoSourceValue *> FSValues;
 
-  void PseudoSourceValue::print(std::ostream &OS) const {
-    OS << name;
+  PSVGlobalsTy() : PSVs() {}
+  ~PSVGlobalsTy() {
+    for (std::map<int, const PseudoSourceValue *>::iterator
+           I = FSValues.begin(), E = FSValues.end(); I != E; ++I) {
+      delete I->second;
+    }
   }
+};
+
+static ManagedStatic<PSVGlobalsTy> PSVGlobals;
+
+}  // anonymous namespace
+
+const PseudoSourceValue *PseudoSourceValue::getStack()
+{ return &PSVGlobals->PSVs[0]; }
+const PseudoSourceValue *PseudoSourceValue::getGOT()
+{ return &PSVGlobals->PSVs[1]; }
+const PseudoSourceValue *PseudoSourceValue::getJumpTable()
+{ return &PSVGlobals->PSVs[2]; }
+const PseudoSourceValue *PseudoSourceValue::getConstantPool()
+{ return &PSVGlobals->PSVs[3]; }
+
+static const char *const PSVNames[] = {
+  "Stack",
+  "GOT",
+  "JumpTable",
+  "ConstantPool"
+};
+
+// FIXME: THIS IS A HACK!!!!
+// Eventually these should be uniqued on LLVMContext rather than in a managed
+// static.  For now, we can safely use the global context for the time being to
+// squeak by.
+PseudoSourceValue::PseudoSourceValue(enum ValueTy Subclass) :
+  Value(Type::getInt8PtrTy(getGlobalContext()),
+        Subclass) {}
+
+void PseudoSourceValue::printCustom(raw_ostream &O) const {
+  O << PSVNames[this - PSVGlobals->PSVs];
+}
+
+const PseudoSourceValue *PseudoSourceValue::getFixedStack(int FI) {
+  PSVGlobalsTy &PG = *PSVGlobals;
+  sys::ScopedLock locked(PG.Lock);
+  const PseudoSourceValue *&V = PG.FSValues[FI];
+  if (!V)
+    V = new FixedStackPseudoSourceValue(FI);
+  return V;
+}
+
+bool PseudoSourceValue::isConstant(const MachineFrameInfo *) const {
+  if (this == getStack())
+    return false;
+  if (this == getGOT() ||
+      this == getConstantPool() ||
+      this == getJumpTable())
+    return true;
+  llvm_unreachable("Unknown PseudoSourceValue!");
+  return false;
+}
+
+bool PseudoSourceValue::isAliased(const MachineFrameInfo *MFI) const {
+  if (this == getStack() ||
+      this == getGOT() ||
+      this == getConstantPool() ||
+      this == getJumpTable())
+    return false;
+  llvm_unreachable("Unknown PseudoSourceValue!");
+  return true;
+}
+
+bool PseudoSourceValue::mayAlias(const MachineFrameInfo *MFI) const {
+  if (this == getGOT() ||
+      this == getConstantPool() ||
+      this == getJumpTable())
+    return false;
+  return true;
+}
+
+bool FixedStackPseudoSourceValue::isConstant(const MachineFrameInfo *MFI) const{
+  return MFI && MFI->isImmutableObjectIndex(FI);
+}
+
+bool FixedStackPseudoSourceValue::isAliased(const MachineFrameInfo *MFI) const {
+  // Negative frame indices are used for special things that don't
+  // appear in LLVM IR. Non-negative indices may be used for things
+  // like static allocas.
+  if (!MFI)
+    return FI >= 0;
+  // Spill slots should not alias others.
+  return !MFI->isFixedObjectIndex(FI) && !MFI->isSpillSlotObjectIndex(FI);
+}
+
+bool FixedStackPseudoSourceValue::mayAlias(const MachineFrameInfo *MFI) const {
+  if (!MFI)
+    return true;
+  // Spill slots will not alias any LLVM IR value.
+  return !MFI->isSpillSlotObjectIndex(FI);
+}
+
+void FixedStackPseudoSourceValue::printCustom(raw_ostream &OS) const {
+  OS << "FixedStack" << FI;
 }