//===----------------------------------------------------------------------===//
//
// This file contains the declaration of the MCDwarfFile to support the dwarf
-// .file directive.
-// TODO: add the support needed for the .loc directive.
+// .file directive and the .loc directive.
//
//===----------------------------------------------------------------------===//
#define LLVM_MC_MCDWARF_H
#include "llvm/ADT/StringRef.h"
+#include "llvm/CodeGen/MachineLocation.h" // FIXME
+#include "llvm/MC/MCObjectWriter.h"
+#include "llvm/Support/raw_ostream.h"
+#include "llvm/Support/Dwarf.h"
+#include <vector>
namespace llvm {
+ class MachineMove;
class MCContext;
+ class MCExpr;
+ class MCSection;
+ class MCSectionData;
+ class MCStreamer;
+ class MCSymbol;
+ class MCObjectStreamer;
class raw_ostream;
/// MCDwarfFile - Instances of this class represent the name of the dwarf
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 {
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)
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) {}
+ 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.
- MCDwarfLoc(const MCDwarfLoc&); // DO NOT IMPLEMENT
- void operator=(const MCDwarfLoc&); // DO NOT IMPLEMENT
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; }
/// 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;
+ }
};
- inline raw_ostream &operator<<(raw_ostream &OS, const MCDwarfFile &DwarfFile){
- DwarfFile.print(OS);
- return OS;
- }
+ /// 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 void 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 MCCFIInstruction {
+ public:
+ enum OpType { SameValue, Remember, Restore, Move, RelMove };
+ private:
+ OpType Operation;
+ MCSymbol *Label;
+ // Move to & from location.
+ MachineLocation Destination;
+ MachineLocation Source;
+ public:
+ MCCFIInstruction(OpType Op, MCSymbol *L)
+ : Operation(Op), Label(L) {
+ assert(Op == Remember || Op == Restore);
+ }
+ MCCFIInstruction(OpType Op, MCSymbol *L, unsigned Register)
+ : Operation(Op), Label(L), Destination(Register) {
+ assert(Op == SameValue);
+ }
+ 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);
+ }
+ OpType getOperation() const { return Operation; }
+ MCSymbol *getLabel() const { return Label; }
+ const MachineLocation &getDestination() const { return Destination; }
+ const MachineLocation &getSource() const { return Source; }
+ };
+
+ struct MCDwarfFrameInfo {
+ MCDwarfFrameInfo() : Begin(0), End(0), Personality(0), Lsda(0),
+ Instructions(), PersonalityEncoding(0),
+ LsdaEncoding(0) {}
+ MCSymbol *Begin;
+ MCSymbol *End;
+ const MCSymbol *Personality;
+ const MCSymbol *Lsda;
+ std::vector<MCCFIInstruction> Instructions;
+ unsigned PersonalityEncoding;
+ unsigned LsdaEncoding;
+ };
+
+ class MCDwarfFrameEmitter {
+ public:
+ //
+ // This emits the frame info section.
+ //
+ static void Emit(MCStreamer &streamer);
+ static void EmitAdvanceLoc(MCStreamer &Streamer, uint64_t AddrDelta);
+ static void EncodeAdvanceLoc(uint64_t AddrDelta, raw_ostream &OS);
+ };
} // end namespace llvm
#endif
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