llvm-6502/include/llvm/MC/MCDwarf.h
2012-03-26 06:58:25 +00:00

338 lines
11 KiB
C++

//===- MCDwarf.h - Machine Code Dwarf support -------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the declaration of the MCDwarfFile to support the dwarf
// .file directive and the .loc directive.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_MC_MCDWARF_H
#define LLVM_MC_MCDWARF_H
#include "llvm/ADT/StringRef.h"
#include "llvm/MC/MachineLocation.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/Dwarf.h"
#include <vector>
namespace llvm {
class MCContext;
class MCObjectWriter;
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&); // DO NOT IMPLEMENT
void operator=(const MCDwarfFile&); // DO NOT IMPLEMENT
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 \arg 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_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)
: 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.
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; }
/// getColumn - Get the Column of this MCDwarfLoc.
unsigned getColumn() const { return Column; }
/// getFlags - Get the Flags of this MCDwarfLoc.
unsigned getFlags() const { return Flags; }
/// getIsa - Get the Isa of this MCDwarfLoc.
unsigned getIsa() const { return Isa; }
/// 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; }
/// 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; }
/// 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; }
/// 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&); // DO NOT IMPLEMENT
void operator=(const MCLineSection&); // DO NOT IMPLEMENT
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) {
MCLineEntries.push_back(LineEntry);
}
typedef std::vector<MCLineEntry> MCLineEntryCollection;
typedef MCLineEntryCollection::iterator iterator;
typedef MCLineEntryCollection::const_iterator const_iterator;
private:
MCLineEntryCollection MCLineEntries;
public:
const MCLineEntryCollection *getMCLineEntries() const {
return &MCLineEntries;
}
};
class MCDwarfFileTable {
public:
//
// This emits the Dwarf file and the line tables.
//
static const MCSymbol *Emit(MCStreamer *MCOS);
};
class MCDwarfLineAddr {
public:
/// Utility function to encode a Dwarf pair of LineDelta and AddrDeltas.
static void Encode(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);
/// Utility function to write the encoding to an object writer.
static void Write(MCObjectWriter *OW,
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 { SameValue, RememberState, RestoreState, Move, RelMove, Escape,
Restore};
private:
OpType Operation;
MCSymbol *Label;
// Move to & from location.
MachineLocation Destination;
MachineLocation Source;
std::vector<char> Values;
public:
MCCFIInstruction(OpType Op, MCSymbol *L)
: Operation(Op), Label(L) {
assert(Op == RememberState || Op == RestoreState);
}
MCCFIInstruction(OpType Op, MCSymbol *L, unsigned Register)
: Operation(Op), Label(L), Destination(Register) {
assert(Op == SameValue || Op == Restore);
}
MCCFIInstruction(MCSymbol *L, const MachineLocation &D,
const MachineLocation &S)
: Operation(Move), Label(L), Destination(D), Source(S) {
}
MCCFIInstruction(OpType Op, MCSymbol *L, const MachineLocation &D,
const MachineLocation &S)
: Operation(Op), Label(L), Destination(D), Source(S) {
assert(Op == RelMove);
}
MCCFIInstruction(OpType Op, MCSymbol *L, StringRef Vals)
: Operation(Op), Label(L), Values(Vals.begin(), Vals.end()) {
assert(Op == Escape);
}
OpType getOperation() const { return Operation; }
MCSymbol *getLabel() const { return Label; }
const MachineLocation &getDestination() const { return Destination; }
const MachineLocation &getSource() const { return Source; }
const StringRef getValues() const {
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(uint64_t AddrDelta, raw_ostream &OS);
};
} // end namespace llvm
#endif