ARMConstantPoolValue.cpp revision 78e5c1140adc926e7c004748c1c912bfddd875b4 
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>
22using namespace llvm;
23
24ARMConstantPoolValue::ARMConstantPoolValue(Constant *cval, unsigned id,
25                                           ARMCP::ARMCPKind K,
26                                           unsigned char PCAdj,
27                                           const char *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
33ARMConstantPoolValue::ARMConstantPoolValue(LLVMContext &C,
34                                           const char *s, unsigned id,
35                                           unsigned char PCAdj,
36                                           const char *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
42ARMConstantPoolValue::ARMConstantPoolValue(GlobalValue *gv, const char *Modif)
43  : MachineConstantPoolValue((const Type*)Type::getInt32Ty(gv->getContext())),
44    CVal(gv), S(NULL), LabelId(0), Kind(ARMCP::CPValue), PCAdjust(0),
45    Modifier(Modif) {}
46
47GlobalValue *ARMConstantPoolValue::getGV() const {
48  return dyn_cast_or_null<GlobalValue>(CVal);
49}
50
51BlockAddress *ARMConstantPoolValue::getBlockAddress() const {
52  return dyn_cast_or_null<BlockAddress>(CVal);
53}
54
55int ARMConstantPoolValue::getExistingMachineCPValue(MachineConstantPool *CP,
56                                                    unsigned Alignment) {
57  unsigned AlignMask = Alignment - 1;
58  const std::vector<MachineConstantPoolEntry> Constants = CP->getConstants();
59  for (unsigned i = 0, e = Constants.size(); i != e; ++i) {
60    if (Constants[i].isMachineConstantPoolEntry() &&
61        (Constants[i].getAlignment() & AlignMask) == 0) {
62      ARMConstantPoolValue *CPV =
63        (ARMConstantPoolValue *)Constants[i].Val.MachineCPVal;
64      if (CPV->CVal == CVal &&
65          CPV->LabelId == LabelId &&
66          CPV->PCAdjust == PCAdjust &&
67          (CPV->S == S || strcmp(CPV->S, S) == 0) &&
68          (CPV->Modifier == Modifier || strcmp(CPV->Modifier, Modifier) == 0))
69        return i;
70    }
71  }
72
73  return -1;
74}
75
76ARMConstantPoolValue::~ARMConstantPoolValue() {
77  free((void*)S);
78}
79
80void
81ARMConstantPoolValue::AddSelectionDAGCSEId(FoldingSetNodeID &ID) {
82  ID.AddPointer(CVal);
83  ID.AddPointer(S);
84  ID.AddInteger(LabelId);
85  ID.AddInteger(PCAdjust);
86}
87
88bool
89ARMConstantPoolValue::hasSameValue(ARMConstantPoolValue *ACPV) {
90  if (ACPV->Kind == Kind &&
91      ACPV->CVal == CVal &&
92      ACPV->PCAdjust == PCAdjust &&
93      (ACPV->S == S || strcmp(ACPV->S, S) == 0) &&
94      (ACPV->Modifier == Modifier || strcmp(ACPV->Modifier, Modifier) == 0)) {
95    if (ACPV->LabelId == LabelId)
96      return true;
97    // Two PC relative constpool entries containing the same GV address or
98    // external symbols. FIXME: What about blockaddress?
99    if (Kind == ARMCP::CPValue || Kind == ARMCP::CPExtSymbol)
100      return true;
101  }
102  return false;
103}
104
105void ARMConstantPoolValue::dump() const {
106  errs() << "  " << *this;
107}
108
109
110void ARMConstantPoolValue::print(raw_ostream &O) const {
111  if (CVal)
112    O << CVal->getName();
113  else
114    O << S;
115  if (Modifier) O << "(" << Modifier << ")";
116  if (PCAdjust != 0) {
117    O << "-(LPC" << LabelId << "+" << (unsigned)PCAdjust;
118    if (AddCurrentAddress) O << "-.";
119    O << ")";
120  }
121}
122