lib/CodeGen/PseudoSourceValue.cpp

   1 //===-- llvm/CodeGen/PseudoSourceValue.cpp ----------------------*- C++ -*-===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // License. See LICENSE.TXT for details.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This file implements the PseudoSourceValue class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/CodeGen/MachineFrameInfo.h"
  15 #include "llvm/CodeGen/PseudoSourceValue.h"
  16 #include "llvm/DerivedTypes.h"
  17 #include "llvm/Support/Compiler.h"
  18 #include "llvm/Support/ManagedStatic.h"
  19 #include "llvm/Support/raw_ostream.h"
  20 #include <map>
  21 using namespace llvm;
  22
  23 static ManagedStatic<PseudoSourceValue[4]> PSVs;
  24
  25 const PseudoSourceValue *PseudoSourceValue::getStack()
  26 { return &(*PSVs)[0]; }
  27 const PseudoSourceValue *PseudoSourceValue::getGOT()
  28 { return &(*PSVs)[1]; }
  29 const PseudoSourceValue *PseudoSourceValue::getJumpTable()
  30 { return &(*PSVs)[2]; }
  31 const PseudoSourceValue *PseudoSourceValue::getConstantPool()
  32 { return &(*PSVs)[3]; }
  33
  34 static const char *const PSVNames[] = {
  35   "Stack",
  36   "GOT",
  37   "JumpTable",
  38   "ConstantPool"
  39 };
  40
  41 PseudoSourceValue::PseudoSourceValue() :
  42   Value(PointerType::getUnqual(Type::Int8Ty), PseudoSourceValueVal) {}
  43
  44 void PseudoSourceValue::dump() const {
  45   print(errs()); errs() << '\n';
  46 }
  47
  48 void PseudoSourceValue::print(raw_ostream &OS) const {
  49   OS << PSVNames[this - *PSVs];
  50 }
  51
  52 namespace {
  53   /// FixedStackPseudoSourceValue - A specialized PseudoSourceValue
  54   /// for holding FixedStack values, which must include a frame
  55   /// index.
  56   class VISIBILITY_HIDDEN FixedStackPseudoSourceValue
  57     : public PseudoSourceValue {
  58     const int FI;
  59   public:
  60     explicit FixedStackPseudoSourceValue(int fi) : FI(fi) {}
  61
  62     virtual bool isConstant(const MachineFrameInfo *MFI) const;
  63
  64     virtual void print(raw_ostream &OS) const {
  65       OS << "FixedStack" << FI;
  66     }
  67   };
  68 }
  69
  70 static ManagedStatic<std::map<int, const PseudoSourceValue *> > FSValues;
  71
  72 const PseudoSourceValue *PseudoSourceValue::getFixedStack(int FI) {
  73   const PseudoSourceValue *&V = (*FSValues)[FI];
  74   if (!V)
  75     V = new FixedStackPseudoSourceValue(FI);
  76   return V;
  77 }
  78
  79 bool PseudoSourceValue::isConstant(const MachineFrameInfo *) const {
  80   if (this == getStack())
  81     return false;
  82   if (this == getGOT() ||
  83       this == getConstantPool() ||
  84       this == getJumpTable())
  85     return true;
  86   assert(0 && "Unknown PseudoSourceValue!");
  87   return false;
  88 }
  89
  90 bool FixedStackPseudoSourceValue::isConstant(const MachineFrameInfo *MFI) const{
  91   return MFI && MFI->isImmutableObjectIndex(FI);
  92 }