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                                            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 
33 ARMConstantPoolValue::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 
42 ARMConstantPoolValue::ARMConstantPoolValue(const GlobalValue *gv,
43                                            const char *Modif)
44   : MachineConstantPoolValue((const Type*)Type::getInt32Ty(gv->getContext())),
45     CVal(gv), S(NULL), LabelId(0), Kind(ARMCP::CPValue), PCAdjust(0),
46     Modifier(Modif) {}
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 int ARMConstantPoolValue::getExistingMachineCPValue(MachineConstantPool *CP,
57                                                     unsigned Alignment) {
58   unsigned AlignMask = Alignment - 1;
59   const std::vector<MachineConstantPoolEntry> Constants = CP->getConstants();
60   for (unsigned i = 0, e = Constants.size(); i != e; ++i) {
61     if (Constants[i].isMachineConstantPoolEntry() &&
62         (Constants[i].getAlignment() & AlignMask) == 0) {
63       ARMConstantPoolValue *CPV =
64         (ARMConstantPoolValue *)Constants[i].Val.MachineCPVal;
65       if (CPV->CVal == CVal &&
66           CPV->LabelId == LabelId &&
67           CPV->PCAdjust == PCAdjust &&
68           (CPV->S == S || strcmp(CPV->S, S) == 0) &&
69           (CPV->Modifier == Modifier || strcmp(CPV->Modifier, Modifier) == 0))
70         return i;
71     }
72   }
73 
74   return -1;
75 }
76 
77 ARMConstantPoolValue::~ARMConstantPoolValue() {
78   free((void*)S);
79 }
80 
81 void
82 ARMConstantPoolValue::AddSelectionDAGCSEId(FoldingSetNodeID &ID) {
83   ID.AddPointer(CVal);
84   ID.AddPointer(S);
85   ID.AddInteger(LabelId);
86   ID.AddInteger(PCAdjust);
87 }
88 
89 bool
90 ARMConstantPoolValue::hasSameValue(ARMConstantPoolValue *ACPV) {
91   if (ACPV->Kind == Kind &&
92       ACPV->CVal == CVal &&
93       ACPV->PCAdjust == PCAdjust &&
94       (ACPV->S == S || strcmp(ACPV->S, S) == 0) &&
95       (ACPV->Modifier == Modifier || strcmp(ACPV->Modifier, Modifier) == 0)) {
96     if (ACPV->LabelId == LabelId)
97       return true;
98     // Two PC relative constpool entries containing the same GV address or
99     // external symbols. FIXME: What about blockaddress?
100     if (Kind == ARMCP::CPValue || Kind == ARMCP::CPExtSymbol)
101       return true;
102   }
103   return false;
104 }
105 
106 void ARMConstantPoolValue::dump() const {
107   errs() << "  " << *this;
108 }
109 
110 
111 void ARMConstantPoolValue::print(raw_ostream &O) const {
112   if (CVal)
113     O << CVal->getName();
114   else
115     O << S;
116   if (Modifier) O << "(" << Modifier << ")";
117   if (PCAdjust != 0) {
118     O << "-(LPC" << LabelId << "+" << (unsigned)PCAdjust;
119     if (AddCurrentAddress) O << "-.";
120     O << ")";
121   }
122 }
123