diff options
Diffstat (limited to 'include/llvm/MC/MCDwarf.h')
| -rw-r--r-- | include/llvm/MC/MCDwarf.h | 765 |
1 files changed, 405 insertions, 360 deletions
diff --git a/include/llvm/MC/MCDwarf.h b/include/llvm/MC/MCDwarf.h index 3ece262..65b920b 100644 --- a/include/llvm/MC/MCDwarf.h +++ b/include/llvm/MC/MCDwarf.h @@ -23,400 +23,445 @@ #include <vector> namespace llvm { - class MCContext; - class MCSection; - class MCStreamer; - class MCSymbol; - class SourceMgr; - class SMLoc; - - /// MCDwarfFile - Instances of this class represent the name of the dwarf - /// .file directive and its associated dwarf file number in the MC file, - /// and MCDwarfFile's are created and unique'd by the MCContext class where - /// the file number for each is its index into the vector of DwarfFiles (note - /// index 0 is not used and not a valid dwarf file number). - class MCDwarfFile { - // Name - the base name of the file without its directory path. - // The StringRef references memory allocated in the MCContext. - StringRef Name; - - // DirIndex - the index into the list of directory names for this file name. - unsigned DirIndex; - - private: // MCContext creates and uniques these. - friend class MCContext; - MCDwarfFile(StringRef name, unsigned dirIndex) +class MCAsmBackend; +class MCContext; +class MCSection; +class MCStreamer; +class MCSymbol; +class SourceMgr; +class SMLoc; + +/// MCDwarfFile - Instances of this class represent the name of the dwarf +/// .file directive and its associated dwarf file number in the MC file, +/// and MCDwarfFile's are created and unique'd by the MCContext class where +/// the file number for each is its index into the vector of DwarfFiles (note +/// index 0 is not used and not a valid dwarf file number). +class MCDwarfFile { + // Name - the base name of the file without its directory path. + // The StringRef references memory allocated in the MCContext. + StringRef Name; + + // DirIndex - the index into the list of directory names for this file name. + unsigned DirIndex; + +private: // MCContext creates and uniques these. + friend class MCContext; + MCDwarfFile(StringRef name, unsigned dirIndex) : Name(name), DirIndex(dirIndex) {} - MCDwarfFile(const MCDwarfFile&) LLVM_DELETED_FUNCTION; - void operator=(const MCDwarfFile&) LLVM_DELETED_FUNCTION; - public: - /// getName - Get the base name of this MCDwarfFile. - StringRef getName() const { return Name; } - - /// getDirIndex - Get the dirIndex of this MCDwarfFile. - unsigned getDirIndex() const { return DirIndex; } - - - /// print - Print the value to the stream \p OS. - void print(raw_ostream &OS) const; - - /// dump - Print the value to stderr. - void dump() const; - }; - - inline raw_ostream &operator<<(raw_ostream &OS, const MCDwarfFile &DwarfFile){ - DwarfFile.print(OS); - return OS; - } - - /// MCDwarfLoc - Instances of this class represent the information from a - /// dwarf .loc directive. - class MCDwarfLoc { - // FileNum - the file number. - unsigned FileNum; - // Line - the line number. - unsigned Line; - // Column - the column position. - unsigned Column; - // Flags (see #define's below) - unsigned Flags; - // Isa - unsigned Isa; - // Discriminator - unsigned Discriminator; + MCDwarfFile(const MCDwarfFile &) LLVM_DELETED_FUNCTION; + void operator=(const MCDwarfFile &) LLVM_DELETED_FUNCTION; + +public: + /// getName - Get the base name of this MCDwarfFile. + StringRef getName() const { return Name; } + + /// getDirIndex - Get the dirIndex of this MCDwarfFile. + unsigned getDirIndex() const { return DirIndex; } + + /// print - Print the value to the stream \p OS. + void print(raw_ostream &OS) const; + + /// dump - Print the value to stderr. + void dump() const; +}; + +inline raw_ostream &operator<<(raw_ostream &OS, const MCDwarfFile &DwarfFile) { + DwarfFile.print(OS); + return OS; +} + +/// MCDwarfLoc - Instances of this class represent the information from a +/// dwarf .loc directive. +class MCDwarfLoc { + // FileNum - the file number. + unsigned FileNum; + // Line - the line number. + unsigned Line; + // Column - the column position. + unsigned Column; + // Flags (see #define's below) + unsigned Flags; + // Isa + unsigned Isa; + // Discriminator + unsigned Discriminator; // Flag that indicates the initial value of the is_stmt_start flag. -#define DWARF2_LINE_DEFAULT_IS_STMT 1 +#define DWARF2_LINE_DEFAULT_IS_STMT 1 -#define DWARF2_FLAG_IS_STMT (1 << 0) -#define DWARF2_FLAG_BASIC_BLOCK (1 << 1) -#define DWARF2_FLAG_PROLOGUE_END (1 << 2) +#define DWARF2_FLAG_IS_STMT (1 << 0) +#define DWARF2_FLAG_BASIC_BLOCK (1 << 1) +#define DWARF2_FLAG_PROLOGUE_END (1 << 2) #define DWARF2_FLAG_EPILOGUE_BEGIN (1 << 3) - private: // MCContext manages these - friend class MCContext; - friend class MCLineEntry; - MCDwarfLoc(unsigned fileNum, unsigned line, unsigned column, unsigned flags, - unsigned isa, unsigned discriminator) +private: // MCContext manages these + friend class MCContext; + friend class MCLineEntry; + MCDwarfLoc(unsigned fileNum, unsigned line, unsigned column, unsigned flags, + unsigned isa, unsigned discriminator) : FileNum(fileNum), Line(line), Column(column), Flags(flags), Isa(isa), Discriminator(discriminator) {} - // Allow the default copy constructor and assignment operator to be used - // for an MCDwarfLoc object. + // Allow the default copy constructor and assignment operator to be used + // for an MCDwarfLoc object. - public: - /// getFileNum - Get the FileNum of this MCDwarfLoc. - unsigned getFileNum() const { return FileNum; } +public: + /// getFileNum - Get the FileNum of this MCDwarfLoc. + unsigned getFileNum() const { return FileNum; } - /// getLine - Get the Line of this MCDwarfLoc. - unsigned getLine() const { return Line; } + /// getLine - Get the Line of this MCDwarfLoc. + unsigned getLine() const { return Line; } - /// getColumn - Get the Column of this MCDwarfLoc. - unsigned getColumn() const { return Column; } + /// getColumn - Get the Column of this MCDwarfLoc. + unsigned getColumn() const { return Column; } - /// getFlags - Get the Flags of this MCDwarfLoc. - unsigned getFlags() const { return Flags; } + /// getFlags - Get the Flags of this MCDwarfLoc. + unsigned getFlags() const { return Flags; } - /// getIsa - Get the Isa of this MCDwarfLoc. - unsigned getIsa() const { return Isa; } + /// getIsa - Get the Isa of this MCDwarfLoc. + unsigned getIsa() const { return Isa; } - /// getDiscriminator - Get the Discriminator of this MCDwarfLoc. - unsigned getDiscriminator() const { return Discriminator; } + /// getDiscriminator - Get the Discriminator of this MCDwarfLoc. + unsigned getDiscriminator() const { return Discriminator; } - /// setFileNum - Set the FileNum of this MCDwarfLoc. - void setFileNum(unsigned fileNum) { FileNum = fileNum; } + /// setFileNum - Set the FileNum of this MCDwarfLoc. + void setFileNum(unsigned fileNum) { FileNum = fileNum; } - /// setLine - Set the Line of this MCDwarfLoc. - void setLine(unsigned line) { Line = line; } + /// setLine - Set the Line of this MCDwarfLoc. + void setLine(unsigned line) { Line = line; } - /// setColumn - Set the Column of this MCDwarfLoc. - void setColumn(unsigned column) { Column = column; } + /// setColumn - Set the Column of this MCDwarfLoc. + void setColumn(unsigned column) { Column = column; } - /// setFlags - Set the Flags of this MCDwarfLoc. - void setFlags(unsigned flags) { Flags = flags; } + /// setFlags - Set the Flags of this MCDwarfLoc. + void setFlags(unsigned flags) { Flags = flags; } - /// setIsa - Set the Isa of this MCDwarfLoc. - void setIsa(unsigned isa) { Isa = isa; } + /// setIsa - Set the Isa of this MCDwarfLoc. + void setIsa(unsigned isa) { Isa = isa; } - /// setDiscriminator - Set the Discriminator of this MCDwarfLoc. - void setDiscriminator(unsigned discriminator) { - Discriminator = discriminator; - } - }; + /// setDiscriminator - Set the Discriminator of this MCDwarfLoc. + void setDiscriminator(unsigned discriminator) { + Discriminator = discriminator; + } +}; + +/// MCLineEntry - Instances of this class represent the line information for +/// the dwarf line table entries. Which is created after a machine +/// instruction is assembled and uses an address from a temporary label +/// created at the current address in the current section and the info from +/// the last .loc directive seen as stored in the context. +class MCLineEntry : public MCDwarfLoc { + MCSymbol *Label; + +private: + // Allow the default copy constructor and assignment operator to be used + // for an MCLineEntry object. + +public: + // Constructor to create an MCLineEntry given a symbol and the dwarf loc. + MCLineEntry(MCSymbol *label, const MCDwarfLoc loc) + : MCDwarfLoc(loc), Label(label) {} + + MCSymbol *getLabel() const { return Label; } + + // This is called when an instruction is assembled into the specified + // section and if there is information from the last .loc directive that + // has yet to have a line entry made for it is made. + static void Make(MCStreamer *MCOS, const MCSection *Section); +}; + +/// MCLineSection - Instances of this class represent the line information +/// for a section where machine instructions have been assembled after seeing +/// .loc directives. This is the information used to build the dwarf line +/// table for a section. +class MCLineSection { + +private: + MCLineSection(const MCLineSection &) LLVM_DELETED_FUNCTION; + void operator=(const MCLineSection &) LLVM_DELETED_FUNCTION; + +public: + // Constructor to create an MCLineSection with an empty MCLineEntries + // vector. + MCLineSection() {} + + // addLineEntry - adds an entry to this MCLineSection's line entries + void addLineEntry(const MCLineEntry &LineEntry, unsigned CUID) { + MCLineDivisions[CUID].push_back(LineEntry); + } - /// MCLineEntry - Instances of this class represent the line information for - /// the dwarf line table entries. Which is created after a machine - /// instruction is assembled and uses an address from a temporary label - /// created at the current address in the current section and the info from - /// the last .loc directive seen as stored in the context. - class MCLineEntry : public MCDwarfLoc { - MCSymbol *Label; - - private: - // Allow the default copy constructor and assignment operator to be used - // for an MCLineEntry object. - - public: - // Constructor to create an MCLineEntry given a symbol and the dwarf loc. - MCLineEntry(MCSymbol *label, const MCDwarfLoc loc) : MCDwarfLoc(loc), - Label(label) {} - - MCSymbol *getLabel() const { return Label; } - - // This is called when an instruction is assembled into the specified - // section and if there is information from the last .loc directive that - // has yet to have a line entry made for it is made. - static void Make(MCStreamer *MCOS, const MCSection *Section); - }; + typedef std::vector<MCLineEntry> MCLineEntryCollection; + typedef MCLineEntryCollection::iterator iterator; + typedef MCLineEntryCollection::const_iterator const_iterator; + typedef std::map<unsigned, MCLineEntryCollection> MCLineDivisionMap; + +private: + // A collection of MCLineEntry for each Compile Unit ID. + MCLineDivisionMap MCLineDivisions; - /// MCLineSection - Instances of this class represent the line information - /// for a section where machine instructions have been assembled after seeing - /// .loc directives. This is the information used to build the dwarf line - /// table for a section. - class MCLineSection { - - private: - MCLineSection(const MCLineSection&) LLVM_DELETED_FUNCTION; - void operator=(const MCLineSection&) LLVM_DELETED_FUNCTION; - - public: - // Constructor to create an MCLineSection with an empty MCLineEntries - // vector. - MCLineSection() {} - - // addLineEntry - adds an entry to this MCLineSection's line entries - void addLineEntry(const MCLineEntry &LineEntry, unsigned CUID) { - MCLineDivisions[CUID].push_back(LineEntry); - } - - typedef std::vector<MCLineEntry> MCLineEntryCollection; - typedef MCLineEntryCollection::iterator iterator; - typedef MCLineEntryCollection::const_iterator const_iterator; - typedef std::map<unsigned, MCLineEntryCollection> MCLineDivisionMap; - - private: - // A collection of MCLineEntry for each Compile Unit ID. - MCLineDivisionMap MCLineDivisions; - - public: - // Returns whether MCLineSection contains entries for a given Compile - // Unit ID. - bool containEntriesForID(unsigned CUID) const { - return MCLineDivisions.count(CUID); - } - // Returns the collection of MCLineEntry for a given Compile Unit ID. - const MCLineEntryCollection &getMCLineEntries(unsigned CUID) const { - MCLineDivisionMap::const_iterator CIter = MCLineDivisions.find(CUID); - assert(CIter != MCLineDivisions.end()); - return CIter->second; - } +public: + // Returns whether MCLineSection contains entries for a given Compile + // Unit ID. + bool containEntriesForID(unsigned CUID) const { + return MCLineDivisions.count(CUID); + } + // Returns the collection of MCLineEntry for a given Compile Unit ID. + const MCLineEntryCollection &getMCLineEntries(unsigned CUID) const { + MCLineDivisionMap::const_iterator CIter = MCLineDivisions.find(CUID); + assert(CIter != MCLineDivisions.end()); + return CIter->second; + } +}; + +class MCDwarfFileTable { +public: + // + // This emits the Dwarf file and the line tables for all Compile Units. + // + static const MCSymbol *Emit(MCStreamer *MCOS); + // + // This emits the Dwarf file and the line tables for a given Compile Unit. + // + static const MCSymbol *EmitCU(MCStreamer *MCOS, unsigned ID); +}; + +class MCDwarfLineAddr { +public: + /// Utility function to encode a Dwarf pair of LineDelta and AddrDeltas. + static void Encode(MCContext &Context, int64_t LineDelta, uint64_t AddrDelta, + raw_ostream &OS); + + /// Utility function to emit the encoding to a streamer. + static void Emit(MCStreamer *MCOS, int64_t LineDelta, uint64_t AddrDelta); +}; + +class MCGenDwarfInfo { +public: + // + // When generating dwarf for assembly source files this emits the Dwarf + // sections. + // + static void Emit(MCStreamer *MCOS, const MCSymbol *LineSectionSymbol); +}; + +// When generating dwarf for assembly source files this is the info that is +// needed to be gathered for each symbol that will have a dwarf label. +class MCGenDwarfLabelEntry { +private: + // Name of the symbol without a leading underbar, if any. + StringRef Name; + // The dwarf file number this symbol is in. + unsigned FileNumber; + // The line number this symbol is at. + unsigned LineNumber; + // The low_pc for the dwarf label is taken from this symbol. + MCSymbol *Label; + +public: + MCGenDwarfLabelEntry(StringRef name, unsigned fileNumber, unsigned lineNumber, + MCSymbol *label) + : Name(name), FileNumber(fileNumber), LineNumber(lineNumber), + Label(label) {} + + StringRef getName() const { return Name; } + unsigned getFileNumber() const { return FileNumber; } + unsigned getLineNumber() const { return LineNumber; } + MCSymbol *getLabel() const { return Label; } + + // This is called when label is created when we are generating dwarf for + // assembly source files. + static void Make(MCSymbol *Symbol, MCStreamer *MCOS, SourceMgr &SrcMgr, + SMLoc &Loc); +}; + +class MCCFIInstruction { +public: + enum OpType { + OpSameValue, + OpRememberState, + OpRestoreState, + OpOffset, + OpDefCfaRegister, + OpDefCfaOffset, + OpDefCfa, + OpRelOffset, + OpAdjustCfaOffset, + OpEscape, + OpRestore, + OpUndefined, + OpRegister, + OpWindowSave }; - class MCDwarfFileTable { - public: - // - // This emits the Dwarf file and the line tables for all Compile Units. - // - static const MCSymbol *Emit(MCStreamer *MCOS); - // - // This emits the Dwarf file and the line tables for a given Compile Unit. - // - static const MCSymbol *EmitCU(MCStreamer *MCOS, unsigned ID); +private: + OpType Operation; + MCSymbol *Label; + unsigned Register; + union { + int Offset; + unsigned Register2; }; + std::vector<char> Values; - class MCDwarfLineAddr { - public: - /// Utility function to encode a Dwarf pair of LineDelta and AddrDeltas. - static void Encode(MCContext &Context, int64_t LineDelta, - uint64_t AddrDelta, raw_ostream &OS); + MCCFIInstruction(OpType Op, MCSymbol *L, unsigned R, int O, StringRef V) + : Operation(Op), Label(L), Register(R), Offset(O), + Values(V.begin(), V.end()) { + assert(Op != OpRegister); + } - /// Utility function to emit the encoding to a streamer. - static void Emit(MCStreamer *MCOS, - int64_t LineDelta,uint64_t AddrDelta); - }; + MCCFIInstruction(OpType Op, MCSymbol *L, unsigned R1, unsigned R2) + : Operation(Op), Label(L), Register(R1), Register2(R2) { + assert(Op == OpRegister); + } - class MCGenDwarfInfo { - public: - // - // When generating dwarf for assembly source files this emits the Dwarf - // sections. - // - static void Emit(MCStreamer *MCOS, const MCSymbol *LineSectionSymbol); - }; +public: + /// \brief .cfi_def_cfa defines a rule for computing CFA as: take address from + /// Register and add Offset to it. + static MCCFIInstruction createDefCfa(MCSymbol *L, unsigned Register, + int Offset) { + return MCCFIInstruction(OpDefCfa, L, Register, -Offset, ""); + } - // When generating dwarf for assembly source files this is the info that is - // needed to be gathered for each symbol that will have a dwarf label. - class MCGenDwarfLabelEntry { - private: - // Name of the symbol without a leading underbar, if any. - StringRef Name; - // The dwarf file number this symbol is in. - unsigned FileNumber; - // The line number this symbol is at. - unsigned LineNumber; - // The low_pc for the dwarf label is taken from this symbol. - MCSymbol *Label; - - public: - MCGenDwarfLabelEntry(StringRef name, unsigned fileNumber, - unsigned lineNumber, MCSymbol *label) : - Name(name), FileNumber(fileNumber), LineNumber(lineNumber), Label(label){} - - StringRef getName() const { return Name; } - unsigned getFileNumber() const { return FileNumber; } - unsigned getLineNumber() const { return LineNumber; } - MCSymbol *getLabel() const { return Label; } - - // This is called when label is created when we are generating dwarf for - // assembly source files. - static void Make(MCSymbol *Symbol, MCStreamer *MCOS, SourceMgr &SrcMgr, - SMLoc &Loc); - }; + /// \brief .cfi_def_cfa_register modifies a rule for computing CFA. From now + /// on Register will be used instead of the old one. Offset remains the same. + static MCCFIInstruction createDefCfaRegister(MCSymbol *L, unsigned Register) { + return MCCFIInstruction(OpDefCfaRegister, L, Register, 0, ""); + } - class MCCFIInstruction { - public: - enum OpType { OpSameValue, OpRememberState, OpRestoreState, OpOffset, - OpDefCfaRegister, OpDefCfaOffset, OpDefCfa, OpRelOffset, - OpAdjustCfaOffset, OpEscape, OpRestore, OpUndefined, - OpRegister }; - private: - OpType Operation; - MCSymbol *Label; - unsigned Register; - union { - int Offset; - unsigned Register2; - }; - std::vector<char> Values; - - MCCFIInstruction(OpType Op, MCSymbol *L, unsigned R, int O, StringRef V) : - Operation(Op), Label(L), Register(R), Offset(O), - Values(V.begin(), V.end()) { - assert(Op != OpRegister); - } - - MCCFIInstruction(OpType Op, MCSymbol *L, unsigned R1, unsigned R2) : - Operation(Op), Label(L), Register(R1), Register2(R2) { - assert(Op == OpRegister); - } - - public: - static MCCFIInstruction - createOffset(MCSymbol *L, unsigned Register, int Offset) { - return MCCFIInstruction(OpOffset, L, Register, Offset, ""); - } - - static MCCFIInstruction - createDefCfaRegister(MCSymbol *L, unsigned Register) { - return MCCFIInstruction(OpDefCfaRegister, L, Register, 0, ""); - } - - static MCCFIInstruction createDefCfaOffset(MCSymbol *L, int Offset) { - return MCCFIInstruction(OpDefCfaOffset, L, 0, -Offset, ""); - } - - static MCCFIInstruction - createDefCfa(MCSymbol *L, unsigned Register, int Offset) { - return MCCFIInstruction(OpDefCfa, L, Register, -Offset, ""); - } - - static MCCFIInstruction createUndefined(MCSymbol *L, unsigned Register) { - return MCCFIInstruction(OpUndefined, L, Register, 0, ""); - } - - static MCCFIInstruction createRestore(MCSymbol *L, unsigned Register) { - return MCCFIInstruction(OpRestore, L, Register, 0, ""); - } - - static MCCFIInstruction createSameValue(MCSymbol *L, unsigned Register) { - return MCCFIInstruction(OpSameValue, L, Register, 0, ""); - } - - static MCCFIInstruction createRestoreState(MCSymbol *L) { - return MCCFIInstruction(OpRestoreState, L, 0, 0, ""); - } - - static MCCFIInstruction createRememberState(MCSymbol *L) { - return MCCFIInstruction(OpRememberState, L, 0, 0, ""); - } - - static MCCFIInstruction - createRelOffset(MCSymbol *L, unsigned Register, int Offset) { - return MCCFIInstruction(OpRelOffset, L, Register, Offset, ""); - } - - static MCCFIInstruction - createAdjustCfaOffset(MCSymbol *L, int Adjustment) { - return MCCFIInstruction(OpAdjustCfaOffset, L, 0, Adjustment, ""); - } - - static MCCFIInstruction createEscape(MCSymbol *L, StringRef Vals) { - return MCCFIInstruction(OpEscape, L, 0, 0, Vals); - } - - static MCCFIInstruction - createRegister(MCSymbol *L, unsigned Register1, unsigned Register2) { - return MCCFIInstruction(OpRegister, L, Register1, Register2); - } - - OpType getOperation() const { return Operation; } - MCSymbol *getLabel() const { return Label; } - - unsigned getRegister() const { - assert(Operation == OpDefCfa || Operation == OpOffset || - Operation == OpRestore || Operation == OpUndefined || - Operation == OpSameValue || Operation == OpDefCfaRegister || - Operation == OpRelOffset || Operation == OpRegister); - return Register; - } - - unsigned getRegister2() const { - assert(Operation == OpRegister); - return Register2; - } - - int getOffset() const { - assert(Operation == OpDefCfa || Operation == OpOffset || - Operation == OpRelOffset || Operation == OpDefCfaOffset || - Operation == OpAdjustCfaOffset); - return Offset; - } - - const StringRef getValues() const { - assert(Operation == OpEscape); - return StringRef(&Values[0], Values.size()); - } - }; + /// \brief .cfi_def_cfa_offset modifies a rule for computing CFA. Register + /// remains the same, but offset is new. Note that it is the absolute offset + /// that will be added to a defined register to the compute CFA address. + static MCCFIInstruction createDefCfaOffset(MCSymbol *L, int Offset) { + return MCCFIInstruction(OpDefCfaOffset, L, 0, -Offset, ""); + } - struct MCDwarfFrameInfo { - MCDwarfFrameInfo() : Begin(0), End(0), Personality(0), Lsda(0), - Function(0), Instructions(), PersonalityEncoding(), - LsdaEncoding(0), CompactUnwindEncoding(0), - IsSignalFrame(false) {} - MCSymbol *Begin; - MCSymbol *End; - const MCSymbol *Personality; - const MCSymbol *Lsda; - const MCSymbol *Function; - std::vector<MCCFIInstruction> Instructions; - unsigned PersonalityEncoding; - unsigned LsdaEncoding; - uint32_t CompactUnwindEncoding; - bool IsSignalFrame; - }; + /// \brief .cfi_adjust_cfa_offset Same as .cfi_def_cfa_offset, but + /// Offset is a relative value that is added/subtracted from the previous + /// offset. + static MCCFIInstruction createAdjustCfaOffset(MCSymbol *L, int Adjustment) { + return MCCFIInstruction(OpAdjustCfaOffset, L, 0, Adjustment, ""); + } - class MCDwarfFrameEmitter { - public: - // - // This emits the frame info section. - // - static void Emit(MCStreamer &streamer, bool usingCFI, - bool isEH); - static void EmitAdvanceLoc(MCStreamer &Streamer, uint64_t AddrDelta); - static void EncodeAdvanceLoc(MCContext &Context, uint64_t AddrDelta, - raw_ostream &OS); - }; + /// \brief .cfi_offset Previous value of Register is saved at offset Offset + /// from CFA. + static MCCFIInstruction createOffset(MCSymbol *L, unsigned Register, + int Offset) { + return MCCFIInstruction(OpOffset, L, Register, Offset, ""); + } + + /// \brief .cfi_rel_offset Previous value of Register is saved at offset + /// Offset from the current CFA register. This is transformed to .cfi_offset + /// using the known displacement of the CFA register from the CFA. + static MCCFIInstruction createRelOffset(MCSymbol *L, unsigned Register, + int Offset) { + return MCCFIInstruction(OpRelOffset, L, Register, Offset, ""); + } + + /// \brief .cfi_register Previous value of Register1 is saved in + /// register Register2. + static MCCFIInstruction createRegister(MCSymbol *L, unsigned Register1, + unsigned Register2) { + return MCCFIInstruction(OpRegister, L, Register1, Register2); + } + + /// \brief .cfi_window_save SPARC register window is saved. + static MCCFIInstruction createWindowSave(MCSymbol *L) { + return MCCFIInstruction(OpWindowSave, L, 0, 0, ""); + } + + /// \brief .cfi_restore says that the rule for Register is now the same as it + /// was at the beginning of the function, after all initial instructions added + /// by .cfi_startproc were executed. + static MCCFIInstruction createRestore(MCSymbol *L, unsigned Register) { + return MCCFIInstruction(OpRestore, L, Register, 0, ""); + } + + /// \brief .cfi_undefined From now on the previous value of Register can't be + /// restored anymore. + static MCCFIInstruction createUndefined(MCSymbol *L, unsigned Register) { + return MCCFIInstruction(OpUndefined, L, Register, 0, ""); + } + + /// \brief .cfi_same_value Current value of Register is the same as in the + /// previous frame. I.e., no restoration is needed. + static MCCFIInstruction createSameValue(MCSymbol *L, unsigned Register) { + return MCCFIInstruction(OpSameValue, L, Register, 0, ""); + } + + /// \brief .cfi_remember_state Save all current rules for all registers. + static MCCFIInstruction createRememberState(MCSymbol *L) { + return MCCFIInstruction(OpRememberState, L, 0, 0, ""); + } + + /// \brief .cfi_restore_state Restore the previously saved state. + static MCCFIInstruction createRestoreState(MCSymbol *L) { + return MCCFIInstruction(OpRestoreState, L, 0, 0, ""); + } + + /// \brief .cfi_escape Allows the user to add arbitrary bytes to the unwind + /// info. + static MCCFIInstruction createEscape(MCSymbol *L, StringRef Vals) { + return MCCFIInstruction(OpEscape, L, 0, 0, Vals); + } + + OpType getOperation() const { return Operation; } + MCSymbol *getLabel() const { return Label; } + + unsigned getRegister() const { + assert(Operation == OpDefCfa || Operation == OpOffset || + Operation == OpRestore || Operation == OpUndefined || + Operation == OpSameValue || Operation == OpDefCfaRegister || + Operation == OpRelOffset || Operation == OpRegister); + return Register; + } + + unsigned getRegister2() const { + assert(Operation == OpRegister); + return Register2; + } + + int getOffset() const { + assert(Operation == OpDefCfa || Operation == OpOffset || + Operation == OpRelOffset || Operation == OpDefCfaOffset || + Operation == OpAdjustCfaOffset); + return Offset; + } + + const StringRef getValues() const { + assert(Operation == OpEscape); + return StringRef(&Values[0], Values.size()); + } +}; + +struct MCDwarfFrameInfo { + MCDwarfFrameInfo() + : Begin(0), End(0), Personality(0), Lsda(0), Function(0), Instructions(), + PersonalityEncoding(), LsdaEncoding(0), CompactUnwindEncoding(0), + IsSignalFrame(false) {} + MCSymbol *Begin; + MCSymbol *End; + const MCSymbol *Personality; + const MCSymbol *Lsda; + const MCSymbol *Function; + std::vector<MCCFIInstruction> Instructions; + unsigned PersonalityEncoding; + unsigned LsdaEncoding; + uint32_t CompactUnwindEncoding; + bool IsSignalFrame; +}; + +class MCDwarfFrameEmitter { +public: + // + // This emits the frame info section. + // + static void Emit(MCStreamer &streamer, MCAsmBackend *MAB, + bool usingCFI, bool isEH); + static void EmitAdvanceLoc(MCStreamer &Streamer, uint64_t AddrDelta); + static void EncodeAdvanceLoc(MCContext &Context, uint64_t AddrDelta, + raw_ostream &OS); +}; } // end namespace llvm #endif |