LCOV - code coverage report
Current view: top level - include/llvm/MC - MCDwarf.h (source / functions) Hit Total Coverage
Test: llvm-toolchain.info Lines: 54 54 100.0 %
Date: 2018-07-13 00:08:38 Functions: 7 7 100.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : //===- MCDwarf.h - Machine Code Dwarf support -------------------*- 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 contains the declaration of the MCDwarfFile to support the dwarf
      11             : // .file directive and the .loc directive.
      12             : //
      13             : //===----------------------------------------------------------------------===//
      14             : 
      15             : #ifndef LLVM_MC_MCDWARF_H
      16             : #define LLVM_MC_MCDWARF_H
      17             : 
      18             : #include "llvm/ADT/MapVector.h"
      19             : #include "llvm/ADT/Optional.h"
      20             : #include "llvm/ADT/SmallVector.h"
      21             : #include "llvm/ADT/StringMap.h"
      22             : #include "llvm/ADT/StringRef.h"
      23             : #include "llvm/MC/MCSection.h"
      24             : #include "llvm/Support/Error.h"
      25             : #include "llvm/Support/MD5.h"
      26             : #include <cassert>
      27             : #include <cstdint>
      28             : #include <string>
      29             : #include <utility>
      30             : #include <vector>
      31             : 
      32             : namespace llvm {
      33             : 
      34             : template <typename T> class ArrayRef;
      35             : class MCAsmBackend;
      36             : class MCContext;
      37             : class MCDwarfLineStr;
      38             : class MCObjectStreamer;
      39             : class MCStreamer;
      40             : class MCSymbol;
      41             : class raw_ostream;
      42             : class SMLoc;
      43             : class SourceMgr;
      44             : 
      45             : /// Instances of this class represent the name of the dwarf
      46             : /// .file directive and its associated dwarf file number in the MC file,
      47             : /// and MCDwarfFile's are created and uniqued by the MCContext class where
      48             : /// the file number for each is its index into the vector of DwarfFiles (note
      49             : /// index 0 is not used and not a valid dwarf file number).
      50      164335 : struct MCDwarfFile {
      51             :   // The base name of the file without its directory path.
      52             :   std::string Name;
      53             : 
      54             :   // The index into the list of directory names for this file name.
      55             :   unsigned DirIndex;
      56             : 
      57             :   /// The MD5 checksum, if there is one. Non-owning pointer to data allocated
      58             :   /// in MCContext.
      59             :   MD5::MD5Result *Checksum = nullptr;
      60             : 
      61             :   /// The source code of the file. Non-owning reference to data allocated in
      62             :   /// MCContext.
      63             :   Optional<StringRef> Source;
      64             : };
      65             : 
      66             : /// Instances of this class represent the information from a
      67             : /// dwarf .loc directive.
      68             : class MCDwarfLoc {
      69             :   uint32_t FileNum;
      70             :   uint32_t Line;
      71             :   uint16_t Column;
      72             :   // Flags (see #define's below)
      73             :   uint8_t Flags;
      74             :   uint8_t Isa;
      75             :   uint32_t Discriminator;
      76             : 
      77             : // Flag that indicates the initial value of the is_stmt_start flag.
      78             : #define DWARF2_LINE_DEFAULT_IS_STMT 1
      79             : 
      80             : #define DWARF2_FLAG_IS_STMT (1 << 0)
      81             : #define DWARF2_FLAG_BASIC_BLOCK (1 << 1)
      82             : #define DWARF2_FLAG_PROLOGUE_END (1 << 2)
      83             : #define DWARF2_FLAG_EPILOGUE_BEGIN (1 << 3)
      84             : 
      85             : private: // MCContext manages these
      86             :   friend class MCContext;
      87             :   friend class MCDwarfLineEntry;
      88             : 
      89             :   MCDwarfLoc(unsigned fileNum, unsigned line, unsigned column, unsigned flags,
      90             :              unsigned isa, unsigned discriminator)
      91       33400 :       : FileNum(fileNum), Line(line), Column(column), Flags(flags), Isa(isa),
      92       33400 :         Discriminator(discriminator) {}
      93             : 
      94             :   // Allow the default copy constructor and assignment operator to be used
      95             :   // for an MCDwarfLoc object.
      96             : 
      97             : public:
      98             :   /// Get the FileNum of this MCDwarfLoc.
      99             :   unsigned getFileNum() const { return FileNum; }
     100             : 
     101             :   /// Get the Line of this MCDwarfLoc.
     102             :   unsigned getLine() const { return Line; }
     103             : 
     104             :   /// Get the Column of this MCDwarfLoc.
     105      664222 :   unsigned getColumn() const { return Column; }
     106             : 
     107             :   /// Get the Flags of this MCDwarfLoc.
     108      665575 :   unsigned getFlags() const { return Flags; }
     109             : 
     110             :   /// Get the Isa of this MCDwarfLoc.
     111      664222 :   unsigned getIsa() const { return Isa; }
     112             : 
     113             :   /// Get the Discriminator of this MCDwarfLoc.
     114             :   unsigned getDiscriminator() const { return Discriminator; }
     115             : 
     116             :   /// Set the FileNum of this MCDwarfLoc.
     117      665625 :   void setFileNum(unsigned fileNum) { FileNum = fileNum; }
     118             : 
     119             :   /// Set the Line of this MCDwarfLoc.
     120      665625 :   void setLine(unsigned line) { Line = line; }
     121             : 
     122             :   /// Set the Column of this MCDwarfLoc.
     123             :   void setColumn(unsigned column) {
     124             :     assert(column <= UINT16_MAX);
     125      665625 :     Column = column;
     126             :   }
     127             : 
     128             :   /// Set the Flags of this MCDwarfLoc.
     129             :   void setFlags(unsigned flags) {
     130             :     assert(flags <= UINT8_MAX);
     131      665625 :     Flags = flags;
     132             :   }
     133             : 
     134             :   /// Set the Isa of this MCDwarfLoc.
     135             :   void setIsa(unsigned isa) {
     136             :     assert(isa <= UINT8_MAX);
     137      665625 :     Isa = isa;
     138             :   }
     139             : 
     140             :   /// Set the Discriminator of this MCDwarfLoc.
     141             :   void setDiscriminator(unsigned discriminator) {
     142      665625 :     Discriminator = discriminator;
     143             :   }
     144             : };
     145             : 
     146             : /// Instances of this class represent the line information for
     147             : /// the dwarf line table entries.  Which is created after a machine
     148             : /// instruction is assembled and uses an address from a temporary label
     149             : /// created at the current address in the current section and the info from
     150             : /// the last .loc directive seen as stored in the context.
     151             : class MCDwarfLineEntry : public MCDwarfLoc {
     152             :   MCSymbol *Label;
     153             : 
     154             : private:
     155             :   // Allow the default copy constructor and assignment operator to be used
     156             :   // for an MCDwarfLineEntry object.
     157             : 
     158             : public:
     159             :   // Constructor to create an MCDwarfLineEntry given a symbol and the dwarf loc.
     160             :   MCDwarfLineEntry(MCSymbol *label, const MCDwarfLoc loc)
     161      664222 :       : MCDwarfLoc(loc), Label(label) {}
     162             : 
     163             :   MCSymbol *getLabel() const { return Label; }
     164             : 
     165             :   // This is called when an instruction is assembled into the specified
     166             :   // section and if there is information from the last .loc directive that
     167             :   // has yet to have a line entry made for it is made.
     168             :   static void Make(MCObjectStreamer *MCOS, MCSection *Section);
     169             : };
     170             : 
     171             : /// Instances of this class represent the line information for a compile
     172             : /// unit where machine instructions have been assembled after seeing .loc
     173             : /// directives.  This is the information used to build the dwarf line
     174             : /// table for a section.
     175        2711 : class MCLineSection {
     176             : public:
     177             :   // Add an entry to this MCLineSection's line entries.
     178             :   void addLineEntry(const MCDwarfLineEntry &LineEntry, MCSection *Sec) {
     179      664222 :     MCLineDivisions[Sec].push_back(LineEntry);
     180             :   }
     181             : 
     182             :   using MCDwarfLineEntryCollection = std::vector<MCDwarfLineEntry>;
     183             :   using iterator = MCDwarfLineEntryCollection::iterator;
     184             :   using const_iterator = MCDwarfLineEntryCollection::const_iterator;
     185             :   using MCLineDivisionMap = MapVector<MCSection *, MCDwarfLineEntryCollection>;
     186             : 
     187             : private:
     188             :   // A collection of MCDwarfLineEntry for each section.
     189             :   MCLineDivisionMap MCLineDivisions;
     190             : 
     191             : public:
     192             :   // Returns the collection of MCDwarfLineEntry for a given Compile Unit ID.
     193             :   const MCLineDivisionMap &getMCLineEntries() const {
     194             :     return MCLineDivisions;
     195             :   }
     196             : };
     197             : 
     198       29997 : struct MCDwarfLineTableParams {
     199             :   /// First special line opcode - leave room for the standard opcodes.
     200             :   /// Note: If you want to change this, you'll have to update the
     201             :   /// "StandardOpcodeLengths" table that is emitted in
     202             :   /// \c Emit().
     203             :   uint8_t DWARF2LineOpcodeBase = 13;
     204             :   /// Minimum line offset in a special line info. opcode.  The value
     205             :   /// -5 was chosen to give a reasonable range of values.
     206             :   int8_t DWARF2LineBase = -5;
     207             :   /// Range of line offsets in a special line info. opcode.
     208             :   uint8_t DWARF2LineRange = 14;
     209             : };
     210             : 
     211       48792 : struct MCDwarfLineTableHeader {
     212             :   MCSymbol *Label = nullptr;
     213             :   SmallVector<std::string, 3> MCDwarfDirs;
     214             :   SmallVector<MCDwarfFile, 3> MCDwarfFiles;
     215             :   StringMap<unsigned> SourceIdMap;
     216             :   std::string CompilationDir;
     217             :   MCDwarfFile RootFile;
     218             :   bool HasSource = false;
     219             : private:
     220             :   bool HasAllMD5 = true;
     221             :   bool HasAnyMD5 = false;
     222             : 
     223             : public:
     224       49000 :   MCDwarfLineTableHeader() = default;
     225             : 
     226             :   Expected<unsigned> tryGetFile(StringRef &Directory, StringRef &FileName,
     227             :                                 MD5::MD5Result *Checksum,
     228             :                                 Optional<StringRef> &Source,
     229             :                                 unsigned FileNumber = 0);
     230             :   std::pair<MCSymbol *, MCSymbol *>
     231             :   Emit(MCStreamer *MCOS, MCDwarfLineTableParams Params,
     232             :        Optional<MCDwarfLineStr> &LineStr) const;
     233             :   std::pair<MCSymbol *, MCSymbol *>
     234             :   Emit(MCStreamer *MCOS, MCDwarfLineTableParams Params,
     235             :        ArrayRef<char> SpecialOpcodeLengths,
     236             :        Optional<MCDwarfLineStr> &LineStr) const;
     237             :   void resetMD5Usage() {
     238           1 :     HasAllMD5 = true;
     239           1 :     HasAnyMD5 = false;
     240             :   }
     241             :   void trackMD5Usage(bool MD5Used) {
     242       29697 :     HasAllMD5 &= MD5Used;
     243       29697 :     HasAnyMD5 |= MD5Used;
     244             :   }
     245             :   bool isMD5UsageConsistent() const {
     246         130 :     return MCDwarfFiles.empty() || (HasAllMD5 == HasAnyMD5);
     247             :   }
     248             : 
     249             : private:
     250             :   void emitV2FileDirTables(MCStreamer *MCOS) const;
     251             :   void emitV5FileDirTables(MCStreamer *MCOS, Optional<MCDwarfLineStr> &LineStr,
     252             :                            StringRef CtxCompilationDir) const;
     253             : };
     254             : 
     255       21685 : class MCDwarfDwoLineTable {
     256             :   MCDwarfLineTableHeader Header;
     257             : 
     258             : public:
     259          24 :   void maybeSetRootFile(StringRef Directory, StringRef FileName,
     260             :                         MD5::MD5Result *Checksum, Optional<StringRef> Source) {
     261          24 :     if (!Header.RootFile.Name.empty())
     262             :       return;
     263          16 :     Header.CompilationDir = Directory;
     264          16 :     Header.RootFile.Name = FileName;
     265           8 :     Header.RootFile.DirIndex = 0;
     266           8 :     Header.RootFile.Checksum = Checksum;
     267             :     Header.RootFile.Source = Source;
     268           8 :     Header.trackMD5Usage(Checksum);
     269           8 :     Header.HasSource = Source.hasValue();
     270             :   }
     271             : 
     272             :   unsigned getFile(StringRef Directory, StringRef FileName,
     273             :                    MD5::MD5Result *Checksum, Optional<StringRef> Source) {
     274          72 :     return cantFail(Header.tryGetFile(Directory, FileName, Checksum, Source));
     275             :   }
     276             : 
     277             :   void Emit(MCStreamer &MCOS, MCDwarfLineTableParams Params,
     278             :             MCSection *Section) const;
     279             : };
     280             : 
     281       10844 : class MCDwarfLineTable {
     282             :   MCDwarfLineTableHeader Header;
     283             :   MCLineSection MCLineSections;
     284             : 
     285             : public:
     286             :   // This emits the Dwarf file and the line tables for all Compile Units.
     287             :   static void Emit(MCObjectStreamer *MCOS, MCDwarfLineTableParams Params);
     288             : 
     289             :   // This emits the Dwarf file and the line tables for a given Compile Unit.
     290             :   void EmitCU(MCObjectStreamer *MCOS, MCDwarfLineTableParams Params,
     291             :               Optional<MCDwarfLineStr> &LineStr) const;
     292             : 
     293             :   Expected<unsigned> tryGetFile(StringRef &Directory, StringRef &FileName,
     294             :                                 MD5::MD5Result *Checksum,
     295             :                                 Optional<StringRef> Source,
     296             :                                 unsigned FileNumber = 0);
     297             :   unsigned getFile(StringRef &Directory, StringRef &FileName,
     298             :                    MD5::MD5Result *Checksum, Optional<StringRef> &Source,
     299             :                    unsigned FileNumber = 0) {
     300             :     return cantFail(tryGetFile(Directory, FileName, Checksum, Source,
     301             :                                FileNumber));
     302             :   }
     303             : 
     304             :   void RemapDwarfDirs(MCContext &Context);
     305             : 
     306        2288 :   void setRootFile(StringRef Directory, StringRef FileName,
     307             :                    MD5::MD5Result *Checksum, Optional<StringRef> Source) {
     308        4576 :     Header.CompilationDir = Directory;
     309        4576 :     Header.RootFile.Name = FileName;
     310        2288 :     Header.RootFile.DirIndex = 0;
     311        2288 :     Header.RootFile.Checksum = Checksum;
     312             :     Header.RootFile.Source = Source;
     313        2288 :     Header.trackMD5Usage(Checksum);
     314        2288 :     Header.HasSource = Source.hasValue();
     315        2288 :   }
     316             : 
     317             :   void resetRootFile() {
     318             :     assert(Header.MCDwarfFiles.empty());
     319             :     Header.RootFile.Name.clear();
     320             :     Header.resetMD5Usage();
     321           1 :     Header.HasSource = false;
     322             :   }
     323             : 
     324             :   bool hasRootFile() const { return !Header.RootFile.Name.empty(); }
     325             : 
     326             :   // Report whether MD5 usage has been consistent (all-or-none).
     327             :   bool isMD5UsageConsistent() const { return Header.isMD5UsageConsistent(); }
     328             : 
     329             :   MCSymbol *getLabel() const {
     330             :     return Header.Label;
     331             :   }
     332             : 
     333             :   void setLabel(MCSymbol *Label) {
     334        2592 :     Header.Label = Label;
     335             :   }
     336             : 
     337             :   const SmallVectorImpl<std::string> &getMCDwarfDirs() const {
     338             :     return Header.MCDwarfDirs;
     339             :   }
     340             : 
     341             :   SmallVectorImpl<std::string> &getMCDwarfDirs() {
     342             :     return Header.MCDwarfDirs;
     343             :   }
     344             : 
     345             :   const SmallVectorImpl<MCDwarfFile> &getMCDwarfFiles() const {
     346             :     return Header.MCDwarfFiles;
     347             :   }
     348             : 
     349             :   SmallVectorImpl<MCDwarfFile> &getMCDwarfFiles() {
     350             :     return Header.MCDwarfFiles;
     351             :   }
     352             : 
     353             :   const MCLineSection &getMCLineSections() const {
     354             :     return MCLineSections;
     355             :   }
     356             :   MCLineSection &getMCLineSections() {
     357             :     return MCLineSections;
     358             :   }
     359             : };
     360             : 
     361             : class MCDwarfLineAddr {
     362             : public:
     363             :   /// Utility function to encode a Dwarf pair of LineDelta and AddrDeltas.
     364             :   static void Encode(MCContext &Context, MCDwarfLineTableParams Params,
     365             :                      int64_t LineDelta, uint64_t AddrDelta, raw_ostream &OS);
     366             : 
     367             :   /// Utility function to emit the encoding to a streamer.
     368             :   static void Emit(MCStreamer *MCOS, MCDwarfLineTableParams Params,
     369             :                    int64_t LineDelta, uint64_t AddrDelta);
     370             : };
     371             : 
     372             : class MCGenDwarfInfo {
     373             : public:
     374             :   //
     375             :   // When generating dwarf for assembly source files this emits the Dwarf
     376             :   // sections.
     377             :   //
     378             :   static void Emit(MCStreamer *MCOS);
     379             : };
     380             : 
     381             : // When generating dwarf for assembly source files this is the info that is
     382             : // needed to be gathered for each symbol that will have a dwarf label.
     383             : class MCGenDwarfLabelEntry {
     384             : private:
     385             :   // Name of the symbol without a leading underbar, if any.
     386             :   StringRef Name;
     387             :   // The dwarf file number this symbol is in.
     388             :   unsigned FileNumber;
     389             :   // The line number this symbol is at.
     390             :   unsigned LineNumber;
     391             :   // The low_pc for the dwarf label is taken from this symbol.
     392             :   MCSymbol *Label;
     393             : 
     394             : public:
     395             :   MCGenDwarfLabelEntry(StringRef name, unsigned fileNumber, unsigned lineNumber,
     396             :                        MCSymbol *label)
     397          41 :       : Name(name), FileNumber(fileNumber), LineNumber(lineNumber),
     398          41 :         Label(label) {}
     399             : 
     400             :   StringRef getName() const { return Name; }
     401             :   unsigned getFileNumber() const { return FileNumber; }
     402             :   unsigned getLineNumber() const { return LineNumber; }
     403             :   MCSymbol *getLabel() const { return Label; }
     404             : 
     405             :   // This is called when label is created when we are generating dwarf for
     406             :   // assembly source files.
     407             :   static void Make(MCSymbol *Symbol, MCStreamer *MCOS, SourceMgr &SrcMgr,
     408             :                    SMLoc &Loc);
     409             : };
     410             : 
     411     2465783 : class MCCFIInstruction {
     412             : public:
     413             :   enum OpType {
     414             :     OpSameValue,
     415             :     OpRememberState,
     416             :     OpRestoreState,
     417             :     OpOffset,
     418             :     OpDefCfaRegister,
     419             :     OpDefCfaOffset,
     420             :     OpDefCfa,
     421             :     OpRelOffset,
     422             :     OpAdjustCfaOffset,
     423             :     OpEscape,
     424             :     OpRestore,
     425             :     OpUndefined,
     426             :     OpRegister,
     427             :     OpWindowSave,
     428             :     OpGnuArgsSize
     429             :   };
     430             : 
     431             : private:
     432             :   OpType Operation;
     433             :   MCSymbol *Label;
     434             :   unsigned Register;
     435             :   union {
     436             :     int Offset;
     437             :     unsigned Register2;
     438             :   };
     439             :   std::vector<char> Values;
     440             : 
     441             :   MCCFIInstruction(OpType Op, MCSymbol *L, unsigned R, int O, StringRef V)
     442             :       : Operation(Op), Label(L), Register(R), Offset(O),
     443      612409 :         Values(V.begin(), V.end()) {
     444             :     assert(Op != OpRegister);
     445             :   }
     446             : 
     447             :   MCCFIInstruction(OpType Op, MCSymbol *L, unsigned R1, unsigned R2)
     448         890 :       : Operation(Op), Label(L), Register(R1), Register2(R2) {
     449             :     assert(Op == OpRegister);
     450             :   }
     451             : 
     452             : public:
     453             :   /// .cfi_def_cfa defines a rule for computing CFA as: take address from
     454             :   /// Register and add Offset to it.
     455             :   static MCCFIInstruction createDefCfa(MCSymbol *L, unsigned Register,
     456             :                                        int Offset) {
     457       64792 :     return MCCFIInstruction(OpDefCfa, L, Register, -Offset, "");
     458             :   }
     459             : 
     460             :   /// .cfi_def_cfa_register modifies a rule for computing CFA. From now
     461             :   /// on Register will be used instead of the old one. Offset remains the same.
     462             :   static MCCFIInstruction createDefCfaRegister(MCSymbol *L, unsigned Register) {
     463             :     return MCCFIInstruction(OpDefCfaRegister, L, Register, 0, "");
     464             :   }
     465             : 
     466             :   /// .cfi_def_cfa_offset modifies a rule for computing CFA. Register
     467             :   /// remains the same, but offset is new. Note that it is the absolute offset
     468             :   /// that will be added to a defined register to the compute CFA address.
     469             :   static MCCFIInstruction createDefCfaOffset(MCSymbol *L, int Offset) {
     470      183419 :     return MCCFIInstruction(OpDefCfaOffset, L, 0, -Offset, "");
     471             :   }
     472             : 
     473             :   /// .cfi_adjust_cfa_offset Same as .cfi_def_cfa_offset, but
     474             :   /// Offset is a relative value that is added/subtracted from the previous
     475             :   /// offset.
     476             :   static MCCFIInstruction createAdjustCfaOffset(MCSymbol *L, int Adjustment) {
     477             :     return MCCFIInstruction(OpAdjustCfaOffset, L, 0, Adjustment, "");
     478             :   }
     479             : 
     480             :   /// .cfi_offset Previous value of Register is saved at offset Offset
     481             :   /// from CFA.
     482             :   static MCCFIInstruction createOffset(MCSymbol *L, unsigned Register,
     483             :                                        int Offset) {
     484             :     return MCCFIInstruction(OpOffset, L, Register, Offset, "");
     485             :   }
     486             : 
     487             :   /// .cfi_rel_offset Previous value of Register is saved at offset
     488             :   /// Offset from the current CFA register. This is transformed to .cfi_offset
     489             :   /// using the known displacement of the CFA register from the CFA.
     490             :   static MCCFIInstruction createRelOffset(MCSymbol *L, unsigned Register,
     491             :                                           int Offset) {
     492             :     return MCCFIInstruction(OpRelOffset, L, Register, Offset, "");
     493             :   }
     494             : 
     495             :   /// .cfi_register Previous value of Register1 is saved in
     496             :   /// register Register2.
     497             :   static MCCFIInstruction createRegister(MCSymbol *L, unsigned Register1,
     498             :                                          unsigned Register2) {
     499             :     return MCCFIInstruction(OpRegister, L, Register1, Register2);
     500             :   }
     501             : 
     502             :   /// .cfi_window_save SPARC register window is saved.
     503             :   static MCCFIInstruction createWindowSave(MCSymbol *L) {
     504             :     return MCCFIInstruction(OpWindowSave, L, 0, 0, "");
     505             :   }
     506             : 
     507             :   /// .cfi_restore says that the rule for Register is now the same as it
     508             :   /// was at the beginning of the function, after all initial instructions added
     509             :   /// by .cfi_startproc were executed.
     510             :   static MCCFIInstruction createRestore(MCSymbol *L, unsigned Register) {
     511             :     return MCCFIInstruction(OpRestore, L, Register, 0, "");
     512             :   }
     513             : 
     514             :   /// .cfi_undefined From now on the previous value of Register can't be
     515             :   /// restored anymore.
     516             :   static MCCFIInstruction createUndefined(MCSymbol *L, unsigned Register) {
     517             :     return MCCFIInstruction(OpUndefined, L, Register, 0, "");
     518             :   }
     519             : 
     520             :   /// .cfi_same_value Current value of Register is the same as in the
     521             :   /// previous frame. I.e., no restoration is needed.
     522             :   static MCCFIInstruction createSameValue(MCSymbol *L, unsigned Register) {
     523             :     return MCCFIInstruction(OpSameValue, L, Register, 0, "");
     524             :   }
     525             : 
     526             :   /// .cfi_remember_state Save all current rules for all registers.
     527             :   static MCCFIInstruction createRememberState(MCSymbol *L) {
     528             :     return MCCFIInstruction(OpRememberState, L, 0, 0, "");
     529             :   }
     530             : 
     531             :   /// .cfi_restore_state Restore the previously saved state.
     532             :   static MCCFIInstruction createRestoreState(MCSymbol *L) {
     533             :     return MCCFIInstruction(OpRestoreState, L, 0, 0, "");
     534             :   }
     535             : 
     536             :   /// .cfi_escape Allows the user to add arbitrary bytes to the unwind
     537             :   /// info.
     538             :   static MCCFIInstruction createEscape(MCSymbol *L, StringRef Vals) {
     539             :     return MCCFIInstruction(OpEscape, L, 0, 0, Vals);
     540             :   }
     541             : 
     542             :   /// A special wrapper for .cfi_escape that indicates GNU_ARGS_SIZE
     543             :   static MCCFIInstruction createGnuArgsSize(MCSymbol *L, int Size) {
     544             :     return MCCFIInstruction(OpGnuArgsSize, L, 0, Size, "");
     545             :   }
     546             : 
     547             :   OpType getOperation() const { return Operation; }
     548             :   MCSymbol *getLabel() const { return Label; }
     549             : 
     550             :   unsigned getRegister() const {
     551             :     assert(Operation == OpDefCfa || Operation == OpOffset ||
     552             :            Operation == OpRestore || Operation == OpUndefined ||
     553             :            Operation == OpSameValue || Operation == OpDefCfaRegister ||
     554             :            Operation == OpRelOffset || Operation == OpRegister);
     555             :     return Register;
     556             :   }
     557             : 
     558             :   unsigned getRegister2() const {
     559             :     assert(Operation == OpRegister);
     560             :     return Register2;
     561             :   }
     562             : 
     563             :   int getOffset() const {
     564             :     assert(Operation == OpDefCfa || Operation == OpOffset ||
     565             :            Operation == OpRelOffset || Operation == OpDefCfaOffset ||
     566             :            Operation == OpAdjustCfaOffset || Operation == OpGnuArgsSize);
     567             :     return Offset;
     568             :   }
     569             : 
     570             :   StringRef getValues() const {
     571             :     assert(Operation == OpEscape);
     572           6 :     return StringRef(&Values[0], Values.size());
     573             :   }
     574             : };
     575             : 
     576      971450 : struct MCDwarfFrameInfo {
     577      283074 :   MCDwarfFrameInfo() = default;
     578             : 
     579             :   MCSymbol *Begin = nullptr;
     580             :   MCSymbol *End = nullptr;
     581             :   const MCSymbol *Personality = nullptr;
     582             :   const MCSymbol *Lsda = nullptr;
     583             :   std::vector<MCCFIInstruction> Instructions;
     584             :   unsigned CurrentCfaRegister = 0;
     585             :   unsigned PersonalityEncoding = 0;
     586             :   unsigned LsdaEncoding = 0;
     587             :   uint32_t CompactUnwindEncoding = 0;
     588             :   bool IsSignalFrame = false;
     589             :   bool IsSimple = false;
     590             :   unsigned RAReg = static_cast<unsigned>(INT_MAX);
     591             : };
     592             : 
     593             : class MCDwarfFrameEmitter {
     594             : public:
     595             :   //
     596             :   // This emits the frame info section.
     597             :   //
     598             :   static void Emit(MCObjectStreamer &streamer, MCAsmBackend *MAB, bool isEH);
     599             :   static void EmitAdvanceLoc(MCObjectStreamer &Streamer, uint64_t AddrDelta);
     600             :   static void EncodeAdvanceLoc(MCContext &Context, uint64_t AddrDelta,
     601             :                                raw_ostream &OS);
     602             : };
     603             : 
     604             : } // end namespace llvm
     605             : 
     606             : #endif // LLVM_MC_MCDWARF_H

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