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
ARMConstantPoolValue(const Constant * cval,unsigned id,ARMCP::ARMCPKind K,unsigned char PCAdj,ARMCP::ARMCPModifier Modif,bool AddCA)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((Type*)cval->getType()),
30 CVal(cval), S(NULL), LabelId(id), Kind(K), PCAdjust(PCAdj),
31 Modifier(Modif), AddCurrentAddress(AddCA) {}
32
ARMConstantPoolValue(LLVMContext & C,const char * s,unsigned id,unsigned char PCAdj,ARMCP::ARMCPModifier Modif,bool AddCA)33 ARMConstantPoolValue::ARMConstantPoolValue(LLVMContext &C,
34 const char *s, unsigned id,
35 unsigned char PCAdj,
36 ARMCP::ARMCPModifier Modif,
37 bool AddCA)
38 : MachineConstantPoolValue((Type*)Type::getInt32Ty(C)),
39 CVal(NULL), S(strdup(s)), LabelId(id), Kind(ARMCP::CPExtSymbol),
40 PCAdjust(PCAdj), Modifier(Modif), AddCurrentAddress(AddCA) {}
41
ARMConstantPoolValue(const GlobalValue * gv,ARMCP::ARMCPModifier Modif)42 ARMConstantPoolValue::ARMConstantPoolValue(const GlobalValue *gv,
43 ARMCP::ARMCPModifier Modif)
44 : MachineConstantPoolValue((Type*)Type::getInt32Ty(gv->getContext())),
45 CVal(gv), S(NULL), LabelId(0), Kind(ARMCP::CPValue), PCAdjust(0),
46 Modifier(Modif), AddCurrentAddress(false) {}
47
getGV() const48 const GlobalValue *ARMConstantPoolValue::getGV() const {
49 return dyn_cast_or_null<GlobalValue>(CVal);
50 }
51
getBlockAddress() const52 const BlockAddress *ARMConstantPoolValue::getBlockAddress() const {
53 return dyn_cast_or_null<BlockAddress>(CVal);
54 }
55
CPV_streq(const char * S1,const char * S2)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
getExistingMachineCPValue(MachineConstantPool * CP,unsigned Alignment)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
~ARMConstantPoolValue()85 ARMConstantPoolValue::~ARMConstantPoolValue() {
86 free((void*)S);
87 }
88
89 void
AddSelectionDAGCSEId(FoldingSetNodeID & ID)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
hasSameValue(ARMConstantPoolValue * ACPV)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
dump() const114 void ARMConstantPoolValue::dump() const {
115 errs() << " " << *this;
116 }
117
118
print(raw_ostream & O) const119 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 }
131