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Add comments to the CFI instructions and reformat with clang-format. No functionality change.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189864 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bill Wendling
2013-09-03 22:16:52 +00:00
parent 4bc23f0980
commit 17554f3ffb
1 changed files with 376 additions and 338 deletions
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714
include/llvm/MC/MCDwarf.h
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@@ -23,400 +23,438 @@
#include <vector> #include <vector>
namespace llvm { namespace llvm {
class MCContext; class MCContext;
class MCSection; class MCSection;
class MCStreamer; class MCStreamer;
class MCSymbol; class MCSymbol;
class SourceMgr; class SourceMgr;
class SMLoc; class SMLoc;
/// MCDwarfFile - Instances of this class represent the name of the dwarf /// MCDwarfFile - Instances of this class represent the name of the dwarf
/// .file directive and its associated dwarf file number in the MC file, /// .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 /// 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 /// 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). /// index 0 is not used and not a valid dwarf file number).
class MCDwarfFile { class MCDwarfFile {
// Name - the base name of the file without its directory path. // Name - the base name of the file without its directory path.
// The StringRef references memory allocated in the MCContext. // The StringRef references memory allocated in the MCContext.
StringRef Name; StringRef Name;
// DirIndex - the index into the list of directory names for this file name. // DirIndex - the index into the list of directory names for this file name.
unsigned DirIndex; unsigned DirIndex;
private: // MCContext creates and uniques these. private: // MCContext creates and uniques these.
friend class MCContext; friend class MCContext;
MCDwarfFile(StringRef name, unsigned dirIndex) MCDwarfFile(StringRef name, unsigned dirIndex)
: Name(name), DirIndex(dirIndex) {} : Name(name), DirIndex(dirIndex) {}
MCDwarfFile(const MCDwarfFile&) LLVM_DELETED_FUNCTION; MCDwarfFile(const MCDwarfFile &) LLVM_DELETED_FUNCTION;
void operator=(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. public:
unsigned getDirIndex() const { return DirIndex; } /// 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. /// print - Print the value to the stream \p OS.
void print(raw_ostream &OS) const; void print(raw_ostream &OS) const;
/// dump - Print the value to stderr. /// dump - Print the value to stderr.
void dump() const; void dump() const;
}; };
inline raw_ostream &operator<<(raw_ostream &OS, const MCDwarfFile &DwarfFile){ inline raw_ostream &operator<<(raw_ostream &OS, const MCDwarfFile &DwarfFile) {
DwarfFile.print(OS); DwarfFile.print(OS);
return OS; return OS;
} }
/// MCDwarfLoc - Instances of this class represent the information from a /// MCDwarfLoc - Instances of this class represent the information from a
/// dwarf .loc directive. /// dwarf .loc directive.
class MCDwarfLoc { class MCDwarfLoc {
// FileNum - the file number. // FileNum - the file number.
unsigned FileNum; unsigned FileNum;
// Line - the line number. // Line - the line number.
unsigned Line; unsigned Line;
// Column - the column position. // Column - the column position.
unsigned Column; unsigned Column;
// Flags (see #define's below) // Flags (see #define's below)
unsigned Flags; unsigned Flags;
// Isa // Isa
unsigned Isa; unsigned Isa;
// Discriminator // Discriminator
unsigned Discriminator; unsigned Discriminator;
// Flag that indicates the initial value of the is_stmt_start flag. // 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_IS_STMT (1 << 0)
#define DWARF2_FLAG_BASIC_BLOCK (1 << 1) #define DWARF2_FLAG_BASIC_BLOCK (1 << 1)
#define DWARF2_FLAG_PROLOGUE_END (1 << 2) #define DWARF2_FLAG_PROLOGUE_END (1 << 2)
#define DWARF2_FLAG_EPILOGUE_BEGIN (1 << 3) #define DWARF2_FLAG_EPILOGUE_BEGIN (1 << 3)
private: // MCContext manages these private: // MCContext manages these
friend class MCContext; friend class MCContext;
friend class MCLineEntry; friend class MCLineEntry;
MCDwarfLoc(unsigned fileNum, unsigned line, unsigned column, unsigned flags, MCDwarfLoc(unsigned fileNum, unsigned line, unsigned column, unsigned flags,
unsigned isa, unsigned discriminator) unsigned isa, unsigned discriminator)
: FileNum(fileNum), Line(line), Column(column), Flags(flags), Isa(isa), : FileNum(fileNum), Line(line), Column(column), Flags(flags), Isa(isa),
Discriminator(discriminator) {} Discriminator(discriminator) {}
// Allow the default copy constructor and assignment operator to be used // Allow the default copy constructor and assignment operator to be used
// for an MCDwarfLoc object. // for an MCDwarfLoc object.
public: public:
/// getFileNum - Get the FileNum of this MCDwarfLoc. /// getFileNum - Get the FileNum of this MCDwarfLoc.
unsigned getFileNum() const { return FileNum; } unsigned getFileNum() const { return FileNum; }
/// getLine - Get the Line of this MCDwarfLoc. /// getLine - Get the Line of this MCDwarfLoc.
unsigned getLine() const { return Line; } unsigned getLine() const { return Line; }
/// getColumn - Get the Column of this MCDwarfLoc. /// getColumn - Get the Column of this MCDwarfLoc.
unsigned getColumn() const { return Column; } unsigned getColumn() const { return Column; }
/// getFlags - Get the Flags of this MCDwarfLoc. /// getFlags - Get the Flags of this MCDwarfLoc.
unsigned getFlags() const { return Flags; } unsigned getFlags() const { return Flags; }
/// getIsa - Get the Isa of this MCDwarfLoc. /// getIsa - Get the Isa of this MCDwarfLoc.
unsigned getIsa() const { return Isa; } unsigned getIsa() const { return Isa; }
/// getDiscriminator - Get the Discriminator of this MCDwarfLoc. /// getDiscriminator - Get the Discriminator of this MCDwarfLoc.
unsigned getDiscriminator() const { return Discriminator; } unsigned getDiscriminator() const { return Discriminator; }
/// setFileNum - Set the FileNum of this MCDwarfLoc. /// setFileNum - Set the FileNum of this MCDwarfLoc.
void setFileNum(unsigned fileNum) { FileNum = fileNum; } void setFileNum(unsigned fileNum) { FileNum = fileNum; }
/// setLine - Set the Line of this MCDwarfLoc. /// setLine - Set the Line of this MCDwarfLoc.
void setLine(unsigned line) { Line = line; } void setLine(unsigned line) { Line = line; }
/// setColumn - Set the Column of this MCDwarfLoc. /// setColumn - Set the Column of this MCDwarfLoc.
void setColumn(unsigned column) { Column = column; } void setColumn(unsigned column) { Column = column; }
/// setFlags - Set the Flags of this MCDwarfLoc. /// setFlags - Set the Flags of this MCDwarfLoc.
void setFlags(unsigned flags) { Flags = flags; } void setFlags(unsigned flags) { Flags = flags; }
/// setIsa - Set the Isa of this MCDwarfLoc. /// setIsa - Set the Isa of this MCDwarfLoc.
void setIsa(unsigned isa) { Isa = isa; } void setIsa(unsigned isa) { Isa = isa; }
/// setDiscriminator - Set the Discriminator of this MCDwarfLoc. /// setDiscriminator - Set the Discriminator of this MCDwarfLoc.
void setDiscriminator(unsigned discriminator) { void setDiscriminator(unsigned discriminator) {
Discriminator = 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);
}
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;
}
};
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
}; };
/// MCLineEntry - Instances of this class represent the line information for private:
/// the dwarf line table entries. Which is created after a machine OpType Operation;
/// instruction is assembled and uses an address from a temporary label MCSymbol *Label;
/// created at the current address in the current section and the info from unsigned Register;
/// the last .loc directive seen as stored in the context. union {
class MCLineEntry : public MCDwarfLoc { int Offset;
MCSymbol *Label; unsigned Register2;
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);
}; };
std::vector<char> Values;
/// MCLineSection - Instances of this class represent the line information MCCFIInstruction(OpType Op, MCSymbol *L, unsigned R, int O, StringRef V)
/// for a section where machine instructions have been assembled after seeing : Operation(Op), Label(L), Register(R), Offset(O),
/// .loc directives. This is the information used to build the dwarf line Values(V.begin(), V.end()) {
/// table for a section. assert(Op != OpRegister);
class MCLineSection { }
private: MCCFIInstruction(OpType Op, MCSymbol *L, unsigned R1, unsigned R2)
MCLineSection(const MCLineSection&) LLVM_DELETED_FUNCTION; : Operation(Op), Label(L), Register(R1), Register2(R2) {
void operator=(const MCLineSection&) LLVM_DELETED_FUNCTION; assert(Op == OpRegister);
}
public: public:
// Constructor to create an MCLineSection with an empty MCLineEntries /// \brief .cfi_def_cfa defines a rule for computing CFA as: take address from
// vector. /// \param Register and add \param Offset to it.
MCLineSection() {} static MCCFIInstruction createDefCfa(MCSymbol *L, unsigned Register,
int Offset) {
return MCCFIInstruction(OpDefCfa, L, Register, -Offset, "");
}
// addLineEntry - adds an entry to this MCLineSection's line entries /// \brief .cfi_def_cfa_register modifies a rule for computing CFA. From now
void addLineEntry(const MCLineEntry &LineEntry, unsigned CUID) { /// on \param Register will be used instead of the old one. Offset remains the
MCLineDivisions[CUID].push_back(LineEntry); /// same.
} static MCCFIInstruction createDefCfaRegister(MCSymbol *L, unsigned Register) {
return MCCFIInstruction(OpDefCfaRegister, L, Register, 0, "");
}
typedef std::vector<MCLineEntry> MCLineEntryCollection; /// \brief .cfi_def_cfa_offset modifies a rule for computing CFA. Register
typedef MCLineEntryCollection::iterator iterator; /// remains the same, but offset is new. Note that it is the absolute offset
typedef MCLineEntryCollection::const_iterator const_iterator; /// that will be added to a defined register to the compute CFA address.
typedef std::map<unsigned, MCLineEntryCollection> MCLineDivisionMap; static MCCFIInstruction createDefCfaOffset(MCSymbol *L, int Offset) {
return MCCFIInstruction(OpDefCfaOffset, L, 0, -Offset, "");
}
private: /// \brief .cfi_adjust_cfa_offset Same as .cfi_def_cfa_offset, but \param
// A collection of MCLineEntry for each Compile Unit ID. /// Offset is a relative value that is added/subtracted from the previous
MCLineDivisionMap MCLineDivisions; /// offset.
static MCCFIInstruction createAdjustCfaOffset(MCSymbol *L, int Adjustment) {
return MCCFIInstruction(OpAdjustCfaOffset, L, 0, Adjustment, "");
}
public: /// \brief .cfi_offset Previous value of \param Register is saved at offset
// Returns whether MCLineSection contains entries for a given Compile /// \param Offset from CFA.
// Unit ID. static MCCFIInstruction createOffset(MCSymbol *L, unsigned Register,
bool containEntriesForID(unsigned CUID) const { int Offset) {
return MCLineDivisions.count(CUID); return MCCFIInstruction(OpOffset, L, Register, Offset, "");
} }
// 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 { /// \brief .cfi_rel_offset Previous value of \param Register is saved at
public: /// offset \param Offset from the current CFA register. This is transformed to
// /// .cfi_offset using the known displacement of the CFA register from the CFA.
// This emits the Dwarf file and the line tables for all Compile Units. static MCCFIInstruction createRelOffset(MCSymbol *L, unsigned Register,
// int Offset) {
static const MCSymbol *Emit(MCStreamer *MCOS); return MCCFIInstruction(OpRelOffset, L, Register, Offset, "");
// }
// This emits the Dwarf file and the line tables for a given Compile Unit.
//
static const MCSymbol *EmitCU(MCStreamer *MCOS, unsigned ID);
};
class MCDwarfLineAddr { /// \brief .cfi_register Previous value of \param Register1 is saved in
public: /// register \param Register2.
/// Utility function to encode a Dwarf pair of LineDelta and AddrDeltas. static MCCFIInstruction createRegister(MCSymbol *L, unsigned Register1,
static void Encode(MCContext &Context, int64_t LineDelta, unsigned Register2) {
uint64_t AddrDelta, raw_ostream &OS); return MCCFIInstruction(OpRegister, L, Register1, Register2);
}
/// Utility function to emit the encoding to a streamer. /// \brief .cfi_restore says that the rule for \param Register is now the same
static void Emit(MCStreamer *MCOS, /// as it was at the beginning of the function, after all initial instructions
int64_t LineDelta,uint64_t AddrDelta); /// added by .cfi_startproc were executed.
}; static MCCFIInstruction createRestore(MCSymbol *L, unsigned Register) {
return MCCFIInstruction(OpRestore, L, Register, 0, "");
}
class MCGenDwarfInfo { /// \brief .cfi_undefined From now on the previous value of \param Register
public: /// can't be restored anymore.
// static MCCFIInstruction createUndefined(MCSymbol *L, unsigned Register) {
// When generating dwarf for assembly source files this emits the Dwarf return MCCFIInstruction(OpUndefined, L, Register, 0, "");
// sections. }
//
static void Emit(MCStreamer *MCOS, const MCSymbol *LineSectionSymbol);
};
// When generating dwarf for assembly source files this is the info that is /// \brief .cfi_same_value Current value of \param Register is the same as
// needed to be gathered for each symbol that will have a dwarf label. /// in the previous frame. I.e., no restoration is needed.
class MCGenDwarfLabelEntry { static MCCFIInstruction createSameValue(MCSymbol *L, unsigned Register) {
private: return MCCFIInstruction(OpSameValue, L, Register, 0, "");
// 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: /// \brief .cfi_remember_state Save all current rules for all registers.
MCGenDwarfLabelEntry(StringRef name, unsigned fileNumber, static MCCFIInstruction createRememberState(MCSymbol *L) {
unsigned lineNumber, MCSymbol *label) : return MCCFIInstruction(OpRememberState, L, 0, 0, "");
Name(name), FileNumber(fileNumber), LineNumber(lineNumber), Label(label){} }
StringRef getName() const { return Name; } /// \brief .cfi_restore_state Restore the previously saved state.
unsigned getFileNumber() const { return FileNumber; } static MCCFIInstruction createRestoreState(MCSymbol *L) {
unsigned getLineNumber() const { return LineNumber; } return MCCFIInstruction(OpRestoreState, L, 0, 0, "");
MCSymbol *getLabel() const { return Label; } }
// This is called when label is created when we are generating dwarf for /// \brief .cfi_escape Allows the user to add arbitrary bytes to the unwind
// assembly source files. /// info.
static void Make(MCSymbol *Symbol, MCStreamer *MCOS, SourceMgr &SrcMgr, static MCCFIInstruction createEscape(MCSymbol *L, StringRef Vals) {
SMLoc &Loc); return MCCFIInstruction(OpEscape, L, 0, 0, Vals);
}; }
class MCCFIInstruction { OpType getOperation() const { return Operation; }
public: MCSymbol *getLabel() const { return Label; }
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) : unsigned getRegister() const {
Operation(Op), Label(L), Register(R), Offset(O), assert(Operation == OpDefCfa || Operation == OpOffset ||
Values(V.begin(), V.end()) { Operation == OpRestore || Operation == OpUndefined ||
assert(Op != OpRegister); Operation == OpSameValue || Operation == OpDefCfaRegister ||
} Operation == OpRelOffset || Operation == OpRegister);
return Register;
}
MCCFIInstruction(OpType Op, MCSymbol *L, unsigned R1, unsigned R2) : unsigned getRegister2() const {
Operation(Op), Label(L), Register(R1), Register2(R2) { assert(Operation == OpRegister);
assert(Op == OpRegister); return Register2;
} }
public: int getOffset() const {
static MCCFIInstruction assert(Operation == OpDefCfa || Operation == OpOffset ||
createOffset(MCSymbol *L, unsigned Register, int Offset) { Operation == OpRelOffset || Operation == OpDefCfaOffset ||
return MCCFIInstruction(OpOffset, L, Register, Offset, ""); Operation == OpAdjustCfaOffset);
} return Offset;
}
static MCCFIInstruction const StringRef getValues() const {
createDefCfaRegister(MCSymbol *L, unsigned Register) { assert(Operation == OpEscape);
return MCCFIInstruction(OpDefCfaRegister, L, Register, 0, ""); return StringRef(&Values[0], Values.size());
} }
};
static MCCFIInstruction createDefCfaOffset(MCSymbol *L, int Offset) { struct MCDwarfFrameInfo {
return MCCFIInstruction(OpDefCfaOffset, L, 0, -Offset, ""); 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;
};
static MCCFIInstruction class MCDwarfFrameEmitter {
createDefCfa(MCSymbol *L, unsigned Register, int Offset) { public:
return MCCFIInstruction(OpDefCfa, L, Register, -Offset, ""); //
} // This emits the frame info section.
//
static MCCFIInstruction createUndefined(MCSymbol *L, unsigned Register) { static void Emit(MCStreamer &streamer, bool usingCFI, bool isEH);
return MCCFIInstruction(OpUndefined, L, Register, 0, ""); static void EmitAdvanceLoc(MCStreamer &Streamer, uint64_t AddrDelta);
} static void EncodeAdvanceLoc(MCContext &Context, uint64_t AddrDelta,
raw_ostream &OS);
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());
}
};
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, 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 } // end namespace llvm
#endif #endif