lib/Target/ARM/ARMConstantPoolValue.cpp

   1 //===- ARMConstantPoolValue.cpp - ARM constantpool value --------*- 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 ARM specific constantpool value class.
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "ARMConstantPoolValue.h"
  15 #include "llvm/ADT/FoldingSet.h"
  16 #include "llvm/Constant.h"
  17 #include "llvm/Constants.h"
  18 #include "llvm/GlobalValue.h"
  19 #include "llvm/Type.h"
  20 #include "llvm/Support/raw_ostream.h"
  21 #include <cstdlib>
  22 using namespace llvm;
  23
  24 ARMConstantPoolValue::ARMConstantPoolValue(const Constant *cval, unsigned id,
  25                                            ARMCP::ARMCPKind K,
  26                                            unsigned char PCAdj,
  27                                            ARMCP::ARMCPModifier Modif,
  28                                            bool AddCA)
  29   : MachineConstantPoolValue((const Type*)cval->getType()),
  30     CVal(cval), S(NULL), LabelId(id), Kind(K), PCAdjust(PCAdj),
  31     Modifier(Modif), AddCurrentAddress(AddCA) {}
  32
  33 ARMConstantPoolValue::ARMConstantPoolValue(LLVMContext &C,
  34                                            const char *s, unsigned id,
  35                                            unsigned char PCAdj,
  36                                            ARMCP::ARMCPModifier Modif,
  37                                            bool AddCA)
  38   : MachineConstantPoolValue((const Type*)Type::getInt32Ty(C)),
  39     CVal(NULL), S(strdup(s)), LabelId(id), Kind(ARMCP::CPExtSymbol),
  40     PCAdjust(PCAdj), Modifier(Modif), AddCurrentAddress(AddCA) {}
  41
  42 ARMConstantPoolValue::ARMConstantPoolValue(const GlobalValue *gv,
  43                                            ARMCP::ARMCPModifier Modif)
  44   : MachineConstantPoolValue((const Type*)Type::getInt32Ty(gv->getContext())),
  45     CVal(gv), S(NULL), LabelId(0), Kind(ARMCP::CPValue), PCAdjust(0),
  46     Modifier(Modif), AddCurrentAddress(false) {}
  47
  48 const GlobalValue *ARMConstantPoolValue::getGV() const {
  49   return dyn_cast_or_null<GlobalValue>(CVal);
  50 }
  51
  52 const BlockAddress *ARMConstantPoolValue::getBlockAddress() const {
  53   return dyn_cast_or_null<BlockAddress>(CVal);
  54 }
  55
  56 static bool CPV_streq(const char *S1, const char *S2) {
  57   if (S1 == S2)
  58     return true;
  59   if (S1 && S2 && strcmp(S1, S2) == 0)
  60     return true;
  61   return false;
  62 }
  63
  64 int ARMConstantPoolValue::getExistingMachineCPValue(MachineConstantPool *CP,
  65                                                     unsigned Alignment) {
  66   unsigned AlignMask = Alignment - 1;
  67   const std::vector<MachineConstantPoolEntry> Constants = CP->getConstants();
  68   for (unsigned i = 0, e = Constants.size(); i != e; ++i) {
  69     if (Constants[i].isMachineConstantPoolEntry() &&
  70         (Constants[i].getAlignment() & AlignMask) == 0) {
  71       ARMConstantPoolValue *CPV =
  72         (ARMConstantPoolValue *)Constants[i].Val.MachineCPVal;
  73       if (CPV->CVal == CVal &&
  74           CPV->LabelId == LabelId &&
  75           CPV->PCAdjust == PCAdjust &&
  76           CPV_streq(CPV->S, S) &&
  77           CPV->Modifier == Modifier)
  78         return i;
  79     }
  80   }
  81
  82   return -1;
  83 }
  84
  85 ARMConstantPoolValue::~ARMConstantPoolValue() {
  86   free((void*)S);
  87 }
  88
  89 void
  90 ARMConstantPoolValue::AddSelectionDAGCSEId(FoldingSetNodeID &ID) {
  91   ID.AddPointer(CVal);
  92   ID.AddPointer(S);
  93   ID.AddInteger(LabelId);
  94   ID.AddInteger(PCAdjust);
  95 }
  96
  97 bool
  98 ARMConstantPoolValue::hasSameValue(ARMConstantPoolValue *ACPV) {
  99   if (ACPV->Kind == Kind &&
 100       ACPV->CVal == CVal &&
 101       ACPV->PCAdjust == PCAdjust &&
 102       CPV_streq(ACPV->S, S) &&
 103       ACPV->Modifier == Modifier) {
 104     if (ACPV->LabelId == LabelId)
 105       return true;
 106     // Two PC relative constpool entries containing the same GV address or
 107     // external symbols. FIXME: What about blockaddress?
 108     if (Kind == ARMCP::CPValue || Kind == ARMCP::CPExtSymbol)
 109       return true;
 110   }
 111   return false;
 112 }
 113
 114 void ARMConstantPoolValue::dump() const {
 115   errs() << "  " << *this;
 116 }
 117
 118
 119 void ARMConstantPoolValue::print(raw_ostream &O) const {
 120   if (CVal)
 121     O << CVal->getName();
 122   else
 123     O << S;
 124   if (Modifier) O << "(" << getModifierText() << ")";
 125   if (PCAdjust != 0) {
 126     O << "-(LPC" << LabelId << "+" << (unsigned)PCAdjust;
 127     if (AddCurrentAddress) O << "-.";
 128     O << ")";
 129   }
 130 }