| //===-- llvm/CodeGen/DebugLocEntry.h - Entry in debug_loc list -*- C++ -*--===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef CODEGEN_ASMPRINTER_DEBUGLOCENTRY_H__ |
| #define CODEGEN_ASMPRINTER_DEBUGLOCENTRY_H__ |
| #include "llvm/IR/Constants.h" |
| #include "llvm/MC/MachineLocation.h" |
| #include "llvm/MC/MCSymbol.h" |
| |
| namespace llvm { |
| class DwarfCompileUnit; |
| class MDNode; |
| /// \brief This struct describes location entries emitted in the .debug_loc |
| /// section. |
| class DebugLocEntry { |
| // Begin and end symbols for the address range that this location is valid. |
| const MCSymbol *Begin; |
| const MCSymbol *End; |
| |
| public: |
| /// A single location or constant. |
| struct Value { |
| Value(const MDNode *Var, int64_t i) |
| : Variable(Var), EntryKind(E_Integer) { |
| Constant.Int = i; |
| } |
| Value(const MDNode *Var, const ConstantFP *CFP) |
| : Variable(Var), EntryKind(E_ConstantFP) { |
| Constant.CFP = CFP; |
| } |
| Value(const MDNode *Var, const ConstantInt *CIP) |
| : Variable(Var), EntryKind(E_ConstantInt) { |
| Constant.CIP = CIP; |
| } |
| Value(const MDNode *Var, MachineLocation Loc) |
| : Variable(Var), EntryKind(E_Location), Loc(Loc) { |
| } |
| |
| // The variable to which this location entry corresponds. |
| const MDNode *Variable; |
| |
| // Type of entry that this represents. |
| enum EntryType { E_Location, E_Integer, E_ConstantFP, E_ConstantInt }; |
| enum EntryType EntryKind; |
| |
| // Either a constant, |
| union { |
| int64_t Int; |
| const ConstantFP *CFP; |
| const ConstantInt *CIP; |
| } Constant; |
| |
| // Or a location in the machine frame. |
| MachineLocation Loc; |
| |
| bool operator==(const Value &other) const { |
| if (EntryKind != other.EntryKind) |
| return false; |
| |
| switch (EntryKind) { |
| case E_Location: |
| return Loc == other.Loc; |
| case E_Integer: |
| return Constant.Int == other.Constant.Int; |
| case E_ConstantFP: |
| return Constant.CFP == other.Constant.CFP; |
| case E_ConstantInt: |
| return Constant.CIP == other.Constant.CIP; |
| } |
| llvm_unreachable("unhandled EntryKind"); |
| } |
| |
| bool isLocation() const { return EntryKind == E_Location; } |
| bool isInt() const { return EntryKind == E_Integer; } |
| bool isConstantFP() const { return EntryKind == E_ConstantFP; } |
| bool isConstantInt() const { return EntryKind == E_ConstantInt; } |
| int64_t getInt() const { return Constant.Int; } |
| const ConstantFP *getConstantFP() const { return Constant.CFP; } |
| const ConstantInt *getConstantInt() const { return Constant.CIP; } |
| MachineLocation getLoc() const { return Loc; } |
| const MDNode *getVariable() const { return Variable; } |
| }; |
| private: |
| /// A list of locations/constants belonging to this entry. |
| SmallVector<Value, 1> Values; |
| |
| /// The compile unit that this location entry is referenced by. |
| const DwarfCompileUnit *Unit; |
| |
| public: |
| DebugLocEntry() : Begin(nullptr), End(nullptr), Unit(nullptr) {} |
| DebugLocEntry(const MCSymbol *B, const MCSymbol *E, |
| Value Val, const DwarfCompileUnit *U) |
| : Begin(B), End(E), Unit(U) { |
| Values.push_back(std::move(Val)); |
| } |
| |
| /// \brief Attempt to merge this DebugLocEntry with Next and return |
| /// true if the merge was successful. Entries can be merged if they |
| /// share the same Loc/Constant and if Next immediately follows this |
| /// Entry. |
| bool Merge(const DebugLocEntry &Next) { |
| if ((End == Next.Begin && Values == Next.Values)) { |
| End = Next.End; |
| return true; |
| } |
| return false; |
| } |
| const MCSymbol *getBeginSym() const { return Begin; } |
| const MCSymbol *getEndSym() const { return End; } |
| const DwarfCompileUnit *getCU() const { return Unit; } |
| const ArrayRef<Value> getValues() const { return Values; } |
| void addValue(Value Val) { Values.push_back(Val); } |
| }; |
| |
| } |
| #endif |