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//===- 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.
// TODO: add the support needed for the .loc directive.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_MC_MCDWARF_H
#define LLVM_MC_MCDWARF_H
#include "llvm/ADT/StringRef.h"
#include <vector>
namespace llvm {
class MCContext;
class MCSection;
class MCSymbol;
class raw_ostream;
/// 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;
#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)
: FileNum(fileNum), Line(line), Column(column), Flags(flags), Isa(isa) {}
// Allow the default copy constructor and assignment operator to be used
// for an MCDwarfLoc object.
public:
/// 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; }
};
/// 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) {}
};
/// 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 {
std::vector<MCLineEntry> MCLineEntries;
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);
}
};
} // end namespace llvm
#endif
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