1 //===-- llvm/CodeGen/DebugLocEntry.h - Entry in debug_loc list -*- C++ -*--===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef CODEGEN_ASMPRINTER_DEBUGLOCENTRY_H__
11 #define CODEGEN_ASMPRINTER_DEBUGLOCENTRY_H__
12 #include "llvm/IR/Constants.h"
13 #include "llvm/IR/DebugInfo.h"
14 #include "llvm/MC/MachineLocation.h"
15 #include "llvm/MC/MCSymbol.h"
19 /// \brief This struct describes location entries emitted in the .debug_loc
22 // Begin and end symbols for the address range that this location is valid.
23 const MCSymbol *Begin;
27 /// A single location or constant.
29 Value(const MDNode *Var, int64_t i)
30 : Variable(Var), EntryKind(E_Integer) {
33 Value(const MDNode *Var, const ConstantFP *CFP)
34 : Variable(Var), EntryKind(E_ConstantFP) {
37 Value(const MDNode *Var, const ConstantInt *CIP)
38 : Variable(Var), EntryKind(E_ConstantInt) {
41 Value(const MDNode *Var, MachineLocation Loc)
42 : Variable(Var), EntryKind(E_Location), Loc(Loc) {
45 // The variable to which this location entry corresponds.
46 const MDNode *Variable;
48 // Type of entry that this represents.
49 enum EntryType { E_Location, E_Integer, E_ConstantFP, E_ConstantInt };
50 enum EntryType EntryKind;
55 const ConstantFP *CFP;
56 const ConstantInt *CIP;
59 // Or a location in the machine frame.
62 bool isLocation() const { return EntryKind == E_Location; }
63 bool isInt() const { return EntryKind == E_Integer; }
64 bool isConstantFP() const { return EntryKind == E_ConstantFP; }
65 bool isConstantInt() const { return EntryKind == E_ConstantInt; }
66 int64_t getInt() const { return Constant.Int; }
67 const ConstantFP *getConstantFP() const { return Constant.CFP; }
68 const ConstantInt *getConstantInt() const { return Constant.CIP; }
69 MachineLocation getLoc() const { return Loc; }
70 const MDNode *getVariable() const { return Variable; }
71 friend bool operator==(const Value &, const Value &);
72 friend bool operator<(const Value &, const Value &);
76 /// A nonempty list of locations/constants belonging to this entry,
78 SmallVector<Value, 1> Values;
81 DebugLocEntry(const MCSymbol *B, const MCSymbol *E, Value Val)
83 Values.push_back(std::move(Val));
86 /// \brief If this and Next are describing different pieces of the same
87 // variable, merge them by appending Next's values to the current
89 // Return true if the merge was successful.
90 bool MergeValues(const DebugLocEntry &Next) {
91 if (Begin == Next.Begin && Values.size() > 0 && Next.Values.size() > 0) {
92 DIVariable Var(Values[0].Variable);
93 DIVariable NextVar(Next.Values[0].Variable);
94 if (Var.getName() == NextVar.getName() &&
95 Var.isVariablePiece() && NextVar.isVariablePiece()) {
96 addValues(Next.Values);
104 /// \brief Attempt to merge this DebugLocEntry with Next and return
105 /// true if the merge was successful. Entries can be merged if they
106 /// share the same Loc/Constant and if Next immediately follows this
108 bool MergeRanges(const DebugLocEntry &Next) {
109 // If this and Next are describing the same variable, merge them.
110 if ((End == Next.Begin && Values == Next.Values)) {
117 const MCSymbol *getBeginSym() const { return Begin; }
118 const MCSymbol *getEndSym() const { return End; }
119 const ArrayRef<Value> getValues() const { return Values; }
120 void addValues(ArrayRef<DebugLocEntry::Value> Vals) {
121 Values.append(Vals.begin(), Vals.end());
123 assert(std::all_of(Values.begin(), Values.end(), [](DebugLocEntry::Value V){
124 return DIVariable(V.Variable).isVariablePiece();
125 }) && "value must be a piece");
128 // Sort the pieces by offset.
129 // Remove any duplicate entries by dropping all but the first.
130 void sortUniqueValues() {
131 std::sort(Values.begin(), Values.end());
132 Values.erase(std::unique(Values.begin(), Values.end()), Values.end());
136 /// Compare two Values for equality.
137 inline bool operator==(const DebugLocEntry::Value &A,
138 const DebugLocEntry::Value &B) {
139 if (A.EntryKind != B.EntryKind)
142 if (A.getVariable() != B.getVariable())
145 switch (A.EntryKind) {
146 case DebugLocEntry::Value::E_Location:
147 return A.Loc == B.Loc;
148 case DebugLocEntry::Value::E_Integer:
149 return A.Constant.Int == B.Constant.Int;
150 case DebugLocEntry::Value::E_ConstantFP:
151 return A.Constant.CFP == B.Constant.CFP;
152 case DebugLocEntry::Value::E_ConstantInt:
153 return A.Constant.CIP == B.Constant.CIP;
155 llvm_unreachable("unhandled EntryKind");
158 /// Compare two pieces based on their offset.
159 inline bool operator<(const DebugLocEntry::Value &A,
160 const DebugLocEntry::Value &B) {
161 DIVariable Var(A.getVariable());
162 DIVariable OtherVar(B.getVariable());
163 return Var.getPieceOffset() < OtherVar.getPieceOffset();