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 *getVariableNode() const { return Variable; }
71 DIVariable getVariable() const { return DIVariable(Variable); }
72 bool isVariablePiece() const { return getVariable().isVariablePiece(); }
73 friend bool operator==(const Value &, const Value &);
74 friend bool operator<(const Value &, const Value &);
78 /// A nonempty list of locations/constants belonging to this entry,
80 SmallVector<Value, 1> Values;
83 DebugLocEntry(const MCSymbol *B, const MCSymbol *E, Value Val)
85 Values.push_back(std::move(Val));
88 /// \brief If this and Next are describing different pieces of the same
89 // variable, merge them by appending Next's values to the current
91 // Return true if the merge was successful.
92 bool MergeValues(const DebugLocEntry &Next) {
93 if (Begin == Next.Begin && Values.size() > 0 && Next.Values.size() > 0) {
94 DIVariable Var(Values[0].Variable);
95 DIVariable NextVar(Next.Values[0].Variable);
96 if (Var.getName() == NextVar.getName() &&
97 Var.isVariablePiece() && NextVar.isVariablePiece()) {
98 addValues(Next.Values);
106 /// \brief Attempt to merge this DebugLocEntry with Next and return
107 /// true if the merge was successful. Entries can be merged if they
108 /// share the same Loc/Constant and if Next immediately follows this
110 bool MergeRanges(const DebugLocEntry &Next) {
111 // If this and Next are describing the same variable, merge them.
112 if ((End == Next.Begin && Values == Next.Values)) {
119 const MCSymbol *getBeginSym() const { return Begin; }
120 const MCSymbol *getEndSym() const { return End; }
121 const ArrayRef<Value> getValues() const { return Values; }
122 void addValues(ArrayRef<DebugLocEntry::Value> Vals) {
123 Values.append(Vals.begin(), Vals.end());
125 assert(std::all_of(Values.begin(), Values.end(), [](DebugLocEntry::Value V){
126 return V.isVariablePiece();
127 }) && "value must be a piece");
130 // Sort the pieces by offset.
131 // Remove any duplicate entries by dropping all but the first.
132 void sortUniqueValues() {
133 std::sort(Values.begin(), Values.end());
134 Values.erase(std::unique(Values.begin(), Values.end()), Values.end());
138 /// Compare two Values for equality.
139 inline bool operator==(const DebugLocEntry::Value &A,
140 const DebugLocEntry::Value &B) {
141 if (A.EntryKind != B.EntryKind)
144 if (A.getVariable() != B.getVariable())
147 switch (A.EntryKind) {
148 case DebugLocEntry::Value::E_Location:
149 return A.Loc == B.Loc;
150 case DebugLocEntry::Value::E_Integer:
151 return A.Constant.Int == B.Constant.Int;
152 case DebugLocEntry::Value::E_ConstantFP:
153 return A.Constant.CFP == B.Constant.CFP;
154 case DebugLocEntry::Value::E_ConstantInt:
155 return A.Constant.CIP == B.Constant.CIP;
157 llvm_unreachable("unhandled EntryKind");
160 /// Compare two pieces based on their offset.
161 inline bool operator<(const DebugLocEntry::Value &A,
162 const DebugLocEntry::Value &B) {
163 return A.getVariable().getPieceOffset() < B.getVariable().getPieceOffset();