#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCObjectStreamer.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCMachOSymbolFlags.h"
+#include "llvm/MC/MCSectionMachO.h"
+#include "llvm/MC/MCDwarf.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetAsmBackend.h"
namespace {
-class MCMachOStreamer : public MCStreamer {
-
-private:
- MCAssembler Assembler;
- MCSectionData *CurSectionData;
-
- /// Track the current atom for each section.
- DenseMap<const MCSectionData*, MCSymbolData*> CurrentAtomMap;
-
+class MCMachOStreamer : public MCObjectStreamer {
private:
- MCFragment *getCurrentFragment() const {
- assert(CurSectionData && "No current section!");
-
- if (!CurSectionData->empty())
- return &CurSectionData->getFragmentList().back();
-
- return 0;
- }
-
- /// Get a data fragment to write into, creating a new one if the current
- /// fragment is not a data fragment.
- MCDataFragment *getOrCreateDataFragment() const {
- MCDataFragment *F = dyn_cast_or_null<MCDataFragment>(getCurrentFragment());
- if (!F)
- F = createDataFragment();
- return F;
- }
-
- /// Create a new data fragment in the current section.
- MCDataFragment *createDataFragment() const {
- MCDataFragment *DF = new MCDataFragment(CurSectionData);
- DF->setAtom(CurrentAtomMap.lookup(CurSectionData));
- return DF;
- }
+ void EmitInstToFragment(const MCInst &Inst);
+ void EmitInstToData(const MCInst &Inst);
+ // FIXME: These will likely moved to a better place.
+ void MakeLineEntryForSection(const MCSection *Section);
+ const MCExpr * MakeStartMinusEndExpr(MCSymbol *Start, MCSymbol *End,
+ int IntVal);
+ void EmitDwarfFileTable(void);
public:
MCMachOStreamer(MCContext &Context, TargetAsmBackend &TAB,
- raw_ostream &_OS, MCCodeEmitter *_Emitter)
- : MCStreamer(Context), Assembler(Context, TAB, *_Emitter, _OS),
- CurSectionData(0) {}
- ~MCMachOStreamer() {}
-
- MCAssembler &getAssembler() { return Assembler; }
-
- const MCExpr *AddValueSymbols(const MCExpr *Value) {
- switch (Value->getKind()) {
- case MCExpr::Target: assert(0 && "Can't handle target exprs yet!");
- case MCExpr::Constant:
- break;
-
- case MCExpr::Binary: {
- const MCBinaryExpr *BE = cast<MCBinaryExpr>(Value);
- AddValueSymbols(BE->getLHS());
- AddValueSymbols(BE->getRHS());
- break;
- }
-
- case MCExpr::SymbolRef:
- Assembler.getOrCreateSymbolData(
- cast<MCSymbolRefExpr>(Value)->getSymbol());
- break;
-
- case MCExpr::Unary:
- AddValueSymbols(cast<MCUnaryExpr>(Value)->getSubExpr());
- break;
- }
-
- return Value;
- }
+ raw_ostream &OS, MCCodeEmitter *Emitter)
+ : MCObjectStreamer(Context, TAB, OS, Emitter) {}
/// @name MCStreamer Interface
/// @{
- virtual void SwitchSection(const MCSection *Section);
virtual void EmitLabel(MCSymbol *Symbol);
virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
unsigned MaxBytesToEmit = 0);
virtual void EmitValueToOffset(const MCExpr *Offset,
unsigned char Value = 0);
-
+
virtual void EmitFileDirective(StringRef Filename) {
- report_fatal_error("unsupported directive: '.file'");
+ // FIXME: Just ignore the .file; it isn't important enough to fail the
+ // entire assembly.
+
+ //report_fatal_error("unsupported directive: '.file'");
}
virtual void EmitDwarfFileDirective(unsigned FileNo, StringRef Filename) {
- report_fatal_error("unsupported directive: '.file'");
+ // FIXME: Just ignore the .file; it isn't important enough to fail the
+ // entire assembly.
+
+ //report_fatal_error("unsupported directive: '.file'");
}
-
+
virtual void EmitInstruction(const MCInst &Inst);
+
virtual void Finish();
/// @}
} // end anonymous namespace.
-void MCMachOStreamer::SwitchSection(const MCSection *Section) {
- assert(Section && "Cannot switch to a null section!");
-
- // If already in this section, then this is a noop.
- if (Section == CurSection) return;
-
- CurSection = Section;
- CurSectionData = &Assembler.getOrCreateSectionData(*Section);
-}
-
void MCMachOStreamer::EmitLabel(MCSymbol *Symbol) {
+ // TODO: This is almost exactly the same as WinCOFFStreamer. Consider merging
+ // into MCObjectStreamer.
assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
assert(!Symbol->isVariable() && "Cannot emit a variable symbol!");
assert(CurSection && "Cannot emit before setting section!");
- MCSymbolData &SD = Assembler.getOrCreateSymbolData(*Symbol);
+ Symbol->setSection(*CurSection);
- // Update the current atom map, if necessary.
- bool MustCreateFragment = false;
- if (Assembler.isSymbolLinkerVisible(&SD)) {
- CurrentAtomMap[CurSectionData] = &SD;
+ MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
- // We have to create a new fragment, fragments cannot span atoms.
- MustCreateFragment = true;
- }
+ // We have to create a new fragment if this is an atom defining symbol,
+ // fragments cannot span atoms.
+ if (getAssembler().isSymbolLinkerVisible(SD.getSymbol()))
+ new MCDataFragment(getCurrentSectionData());
// FIXME: This is wasteful, we don't necessarily need to create a data
// fragment. Instead, we should mark the symbol as pointing into the data
// fragment if it exists, otherwise we should just queue the label and set its
// fragment pointer when we emit the next fragment.
- MCDataFragment *F =
- MustCreateFragment ? createDataFragment() : getOrCreateDataFragment();
+ MCDataFragment *F = getOrCreateDataFragment();
assert(!SD.getFragment() && "Unexpected fragment on symbol data!");
SD.setFragment(F);
SD.setOffset(F->getContents().size());
// FIXME: Cleanup this code, these bits should be emitted based on semantic
// properties, not on the order of definition, etc.
SD.setFlags(SD.getFlags() & ~SF_ReferenceTypeMask);
-
- Symbol->setSection(*CurSection);
}
void MCMachOStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
switch (Flag) {
case MCAF_SubsectionsViaSymbols:
- Assembler.setSubsectionsViaSymbols(true);
+ getAssembler().setSubsectionsViaSymbols(true);
return;
}
}
void MCMachOStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
+ // TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
+ // MCObjectStreamer.
// FIXME: Lift context changes into super class.
- Assembler.getOrCreateSymbolData(*Symbol);
+ getAssembler().getOrCreateSymbolData(*Symbol);
Symbol->setVariableValue(AddValueSymbols(Value));
}
// important for matching the string table that 'as' generates.
IndirectSymbolData ISD;
ISD.Symbol = Symbol;
- ISD.SectionData = CurSectionData;
- Assembler.getIndirectSymbols().push_back(ISD);
+ ISD.SectionData = getCurrentSectionData();
+ getAssembler().getIndirectSymbols().push_back(ISD);
return;
}
// Adding a symbol attribute always introduces the symbol, note that an
// important side effect of calling getOrCreateSymbolData here is to register
// the symbol with the assembler.
- MCSymbolData &SD = Assembler.getOrCreateSymbolData(*Symbol);
+ MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
// The implementation of symbol attributes is designed to match 'as', but it
// leaves much to desired. It doesn't really make sense to arbitrarily add and
// it has to be in a coalesced section, but this isn't enforced.
SD.setFlags(SD.getFlags() | SF_WeakDefinition);
break;
+
+ case MCSA_WeakDefAutoPrivate:
+ SD.setFlags(SD.getFlags() | SF_WeakDefinition | SF_WeakReference);
+ break;
}
}
void MCMachOStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
// Encode the 'desc' value into the lowest implementation defined bits.
- assert(DescValue == (DescValue & SF_DescFlagsMask) &&
+ assert(DescValue == (DescValue & SF_DescFlagsMask) &&
"Invalid .desc value!");
- Assembler.getOrCreateSymbolData(*Symbol).setFlags(DescValue&SF_DescFlagsMask);
+ getAssembler().getOrCreateSymbolData(*Symbol).setFlags(
+ DescValue & SF_DescFlagsMask);
}
void MCMachOStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
// FIXME: Darwin 'as' does appear to allow redef of a .comm by itself.
assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
- MCSymbolData &SD = Assembler.getOrCreateSymbolData(*Symbol);
+ MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
SD.setExternal(true);
SD.setCommon(Size, ByteAlignment);
}
void MCMachOStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
unsigned Size, unsigned ByteAlignment) {
- MCSectionData &SectData = Assembler.getOrCreateSectionData(*Section);
+ MCSectionData &SectData = getAssembler().getOrCreateSectionData(*Section);
// The symbol may not be present, which only creates the section.
if (!Symbol)
assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
- MCSymbolData &SD = Assembler.getOrCreateSymbolData(*Symbol);
+ MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
// Emit an align fragment if necessary.
if (ByteAlignment != 1)
MCFragment *F = new MCFillFragment(0, 0, Size, &SectData);
SD.setFragment(F);
- if (Assembler.isSymbolLinkerVisible(&SD))
- F->setAtom(&SD);
Symbol->setSection(*Section);
}
void MCMachOStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
+ // TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
+ // MCObjectStreamer.
getOrCreateDataFragment()->getContents().append(Data.begin(), Data.end());
}
void MCMachOStreamer::EmitValue(const MCExpr *Value, unsigned Size,
unsigned AddrSpace) {
+ // TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
+ // MCObjectStreamer.
MCDataFragment *DF = getOrCreateDataFragment();
// Avoid fixups when possible.
void MCMachOStreamer::EmitValueToAlignment(unsigned ByteAlignment,
int64_t Value, unsigned ValueSize,
unsigned MaxBytesToEmit) {
+ // TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
+ // MCObjectStreamer.
if (MaxBytesToEmit == 0)
MaxBytesToEmit = ByteAlignment;
- MCFragment *F = new MCAlignFragment(ByteAlignment, Value, ValueSize,
- MaxBytesToEmit, CurSectionData);
- F->setAtom(CurrentAtomMap.lookup(CurSectionData));
+ new MCAlignFragment(ByteAlignment, Value, ValueSize, MaxBytesToEmit,
+ getCurrentSectionData());
// Update the maximum alignment on the current section if necessary.
- if (ByteAlignment > CurSectionData->getAlignment())
- CurSectionData->setAlignment(ByteAlignment);
+ if (ByteAlignment > getCurrentSectionData()->getAlignment())
+ getCurrentSectionData()->setAlignment(ByteAlignment);
}
void MCMachOStreamer::EmitCodeAlignment(unsigned ByteAlignment,
unsigned MaxBytesToEmit) {
+ // TODO: This is exactly the same as WinCOFFStreamer. Consider merging into
+ // MCObjectStreamer.
if (MaxBytesToEmit == 0)
MaxBytesToEmit = ByteAlignment;
MCAlignFragment *F = new MCAlignFragment(ByteAlignment, 0, 1, MaxBytesToEmit,
- CurSectionData);
+ getCurrentSectionData());
F->setEmitNops(true);
- F->setAtom(CurrentAtomMap.lookup(CurSectionData));
// Update the maximum alignment on the current section if necessary.
- if (ByteAlignment > CurSectionData->getAlignment())
- CurSectionData->setAlignment(ByteAlignment);
+ if (ByteAlignment > getCurrentSectionData()->getAlignment())
+ getCurrentSectionData()->setAlignment(ByteAlignment);
}
void MCMachOStreamer::EmitValueToOffset(const MCExpr *Offset,
unsigned char Value) {
- MCFragment *F = new MCOrgFragment(*Offset, Value, CurSectionData);
- F->setAtom(CurrentAtomMap.lookup(CurSectionData));
+ new MCOrgFragment(*Offset, Value, getCurrentSectionData());
+}
+
+void MCMachOStreamer::EmitInstToFragment(const MCInst &Inst) {
+ MCInstFragment *IF = new MCInstFragment(Inst, getCurrentSectionData());
+
+ // Add the fixups and data.
+ //
+ // FIXME: Revisit this design decision when relaxation is done, we may be
+ // able to get away with not storing any extra data in the MCInst.
+ SmallVector<MCFixup, 4> Fixups;
+ SmallString<256> Code;
+ raw_svector_ostream VecOS(Code);
+ getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, Fixups);
+ VecOS.flush();
+
+ IF->getCode() = Code;
+ IF->getFixups() = Fixups;
+}
+
+void MCMachOStreamer::EmitInstToData(const MCInst &Inst) {
+ MCDataFragment *DF = getOrCreateDataFragment();
+
+ SmallVector<MCFixup, 4> Fixups;
+ SmallString<256> Code;
+ raw_svector_ostream VecOS(Code);
+ getAssembler().getEmitter().EncodeInstruction(Inst, VecOS, Fixups);
+ VecOS.flush();
+
+ // Add the fixups and data.
+ for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
+ Fixups[i].setOffset(Fixups[i].getOffset() + DF->getContents().size());
+ DF->addFixup(Fixups[i]);
+ }
+ DF->getContents().append(Code.begin(), Code.end());
}
void MCMachOStreamer::EmitInstruction(const MCInst &Inst) {
if (Inst.getOperand(i).isExpr())
AddValueSymbols(Inst.getOperand(i).getExpr());
- CurSectionData->setHasInstructions(true);
+ getCurrentSectionData()->setHasInstructions(true);
- // FIXME-PERF: Common case is that we don't need to relax, encode directly
- // onto the data fragments buffers.
+ // Now that a machine instruction has been assembled into this section, make
+ // a line entry for any .loc directive that has been seen.
+ MakeLineEntryForSection(getCurrentSection());
- SmallVector<MCFixup, 4> Fixups;
- SmallString<256> Code;
- raw_svector_ostream VecOS(Code);
- Assembler.getEmitter().EncodeInstruction(Inst, VecOS, Fixups);
- VecOS.flush();
+ // If this instruction doesn't need relaxation, just emit it as data.
+ if (!getAssembler().getBackend().MayNeedRelaxation(Inst)) {
+ EmitInstToData(Inst);
+ return;
+ }
- // FIXME: Eliminate this copy.
- SmallVector<MCFixup, 4> AsmFixups;
- for (unsigned i = 0, e = Fixups.size(); i != e; ++i)
- AsmFixups.push_back(Fixups[i]);
+ // Otherwise, if we are relaxing everything, relax the instruction as much as
+ // possible and emit it as data.
+ if (getAssembler().getRelaxAll()) {
+ MCInst Relaxed;
+ getAssembler().getBackend().RelaxInstruction(Inst, Relaxed);
+ while (getAssembler().getBackend().MayNeedRelaxation(Relaxed))
+ getAssembler().getBackend().RelaxInstruction(Relaxed, Relaxed);
+ EmitInstToData(Relaxed);
+ return;
+ }
- // See if we might need to relax this instruction, if so it needs its own
- // fragment.
- //
- // FIXME-PERF: Support target hook to do a fast path that avoids the encoder,
- // when we can immediately tell that we will get something which might need
- // relaxation (and compute its size).
- //
- // FIXME-PERF: We should also be smart about immediately relaxing instructions
- // which we can already show will never possibly fit (we can also do a very
- // good job of this before we do the first relaxation pass, because we have
- // total knowledge about undefined symbols at that point). Even now, though,
- // we can do a decent job, especially on Darwin where scattering means that we
- // are going to often know that we can never fully resolve a fixup.
- if (Assembler.getBackend().MayNeedRelaxation(Inst)) {
- MCInstFragment *IF = new MCInstFragment(Inst, CurSectionData);
- IF->setAtom(CurrentAtomMap.lookup(CurSectionData));
-
- // Add the fixups and data.
- //
- // FIXME: Revisit this design decision when relaxation is done, we may be
- // able to get away with not storing any extra data in the MCInst.
- IF->getCode() = Code;
- IF->getFixups() = AsmFixups;
+ // Otherwise emit to a separate fragment.
+ EmitInstToFragment(Inst);
+}
+//
+// 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.
+//
+void MCMachOStreamer::MakeLineEntryForSection(const MCSection *Section) {
+ if (!getContext().getDwarfLocSeen())
return;
+
+ // Create a symbol at in the current section for use in the line entry.
+ MCSymbol *LineSym = getContext().CreateTempSymbol();
+ // Set the value of the symbol to use for the MCLineEntry.
+ EmitLabel(LineSym);
+
+ // Get the current .loc info saved in the context.
+ const MCDwarfLoc &DwarfLoc = getContext().getCurrentDwarfLoc();
+
+ // Create a (local) line entry with the symbol and the current .loc info.
+ MCLineEntry LineEntry(LineSym, DwarfLoc);
+
+ // clear DwarfLocSeen saying the current .loc info is now used.
+ getContext().clearDwarfLocSeen();
+
+ // Get the MCLineSection for this section, if one does not exist for this
+ // section create it.
+ DenseMap<const MCSection *, MCLineSection *> &MCLineSections =
+ getContext().getMCLineSections();
+ MCLineSection *LineSection = MCLineSections[Section];
+ if (!LineSection) {
+ // Create a new MCLineSection. This will be deleted after the dwarf line
+ // table is created using it by iterating through the MCLineSections
+ // DenseMap.
+ LineSection = new MCLineSection;
+ // Save a pointer to the new LineSection into the MCLineSections DenseMap.
+ MCLineSections[Section] = LineSection;
}
- // Add the fixups and data.
- MCDataFragment *DF = getOrCreateDataFragment();
- for (unsigned i = 0, e = AsmFixups.size(); i != e; ++i) {
- AsmFixups[i].setOffset(AsmFixups[i].getOffset() + DF->getContents().size());
- DF->addFixup(AsmFixups[i]);
+ // Add the line entry to this section's entries.
+ LineSection->addLineEntry(LineEntry);
+}
+
+//
+// This helper routine returns an expression of End - Start + IntVal for use
+// by EmitDwarfFileTable() below.
+//
+const MCExpr * MCMachOStreamer::MakeStartMinusEndExpr(MCSymbol *Start,
+ MCSymbol *End,
+ int IntVal) {
+ MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
+ const MCExpr *Res =
+ MCSymbolRefExpr::Create(End, Variant, getContext());
+ const MCExpr *RHS =
+ MCSymbolRefExpr::Create(Start, Variant, getContext());
+ const MCExpr *Res1 =
+ MCBinaryExpr::Create(MCBinaryExpr::Sub, Res, RHS,getContext());
+ const MCExpr *Res2 =
+ MCConstantExpr::Create(IntVal, getContext());
+ const MCExpr *Res3 =
+ MCBinaryExpr::Create(MCBinaryExpr::Sub, Res1, Res2, getContext());
+ return Res3;
+}
+
+//
+// This emits the Dwarf file (and eventually the line) table.
+//
+void MCMachOStreamer::EmitDwarfFileTable(void) {
+ // For now make sure we don't put out the Dwarf file table if no .file
+ // directives were seen.
+ const std::vector<MCDwarfFile *> &MCDwarfFiles =
+ getContext().getMCDwarfFiles();
+ if (MCDwarfFiles.size() == 0)
+ return;
+
+ // This is the Mach-O section, for ELF it is the .debug_line section.
+ SwitchSection(getContext().getMachOSection("__DWARF", "__debug_line",
+ MCSectionMachO::S_ATTR_DEBUG,
+ 0, SectionKind::getDataRelLocal()));
+
+ // Create a symbol at the beginning of this section.
+ MCSymbol *LineStartSym = getContext().CreateTempSymbol();
+ // Set the value of the symbol, as we are at the start of the section.
+ EmitLabel(LineStartSym);
+
+ // Create a symbol for the end of the section (to be set when we get there).
+ MCSymbol *LineEndSym = getContext().CreateTempSymbol();
+
+ // The first 4 bytes is the total length of the information for this
+ // compilation unit (not including these 4 bytes for the length).
+ EmitValue(MakeStartMinusEndExpr(LineStartSym, LineEndSym, 4), 4, 0);
+
+ // Next 2 bytes is the Version, which is Dwarf 2.
+ EmitIntValue(2, 2);
+
+ // Create a symbol for the end of the prologue (to be set when we get there).
+ MCSymbol *ProEndSym = getContext().CreateTempSymbol(); // Lprologue_end
+
+ // Length of the prologue, is the next 4 bytes. Which is the start of the
+ // section to the end of the prologue. Not including the 4 bytes for the
+ // total length, the 2 bytes for the version, and these 4 bytes for the
+ // length of the prologue.
+ EmitValue(MakeStartMinusEndExpr(LineStartSym, ProEndSym, (4 + 2 + 4)), 4, 0);
+
+ // Parameters of the state machine, are next.
+ // Define the architecture-dependent minimum instruction length (in
+ // bytes). This value should be rather too small than too big. */
+ // DWARF2_LINE_MIN_INSN_LENGTH
+ EmitIntValue(1, 1);
+ // Flag that indicates the initial value of the is_stmt_start flag.
+ // DWARF2_LINE_DEFAULT_IS_STMT
+ EmitIntValue(1, 1);
+ // Minimum line offset in a special line info. opcode. This value
+ // was chosen to give a reasonable range of values. */
+ // DWARF2_LINE_BASE
+ EmitIntValue(-5, 1);
+ // Range of line offsets in a special line info. opcode.
+ // DWARF2_LINE_RANGE
+ EmitIntValue(14, 1);
+ // First special line opcode - leave room for the standard opcodes.
+ // DWARF2_LINE_OPCODE_BASE
+ EmitIntValue(13, 1);
+
+ // Standard opcode lengths
+ EmitIntValue(0, 1); // length of DW_LNS_copy
+ EmitIntValue(1, 1); // length of DW_LNS_advance_pc
+ EmitIntValue(1, 1); // length of DW_LNS_advance_line
+ EmitIntValue(1, 1); // length of DW_LNS_set_file
+ EmitIntValue(1, 1); // length of DW_LNS_set_column
+ EmitIntValue(0, 1); // length of DW_LNS_negate_stmt
+ EmitIntValue(0, 1); // length of DW_LNS_set_basic_block
+ EmitIntValue(0, 1); // length of DW_LNS_const_add_pc
+ EmitIntValue(1, 1); // length of DW_LNS_fixed_advance_pc
+ EmitIntValue(0, 1); // length of DW_LNS_set_prologue_end
+ EmitIntValue(0, 1); // length of DW_LNS_set_epilogue_begin
+ EmitIntValue(1, 1); // DW_LNS_set_isa
+
+ // Put out the directory and file tables.
+
+ // First the directory table.
+ const std::vector<StringRef> &MCDwarfDirs =
+ getContext().getMCDwarfDirs();
+ for (unsigned i = 0; i < MCDwarfDirs.size(); i++) {
+ EmitBytes(MCDwarfDirs[i], 0); // the DirectoryName
+ EmitBytes(StringRef("\0", 1), 0); // the null termination of the string
}
- DF->getContents().append(Code.begin(), Code.end());
+ EmitIntValue(0, 1); // Terminate the directory list
+
+ // Second the file table.
+ for (unsigned i = 1; i < MCDwarfFiles.size(); i++) {
+ EmitBytes(MCDwarfFiles[i]->getName(), 0); // FileName
+ EmitBytes(StringRef("\0", 1), 0); // the null termination of the string
+ // FIXME the Directory number should be a .uleb128 not a .byte
+ EmitIntValue(MCDwarfFiles[i]->getDirIndex(), 1);
+ EmitIntValue(0, 1); // last modification timestamp (always 0)
+ EmitIntValue(0, 1); // filesize (always 0)
+ }
+ EmitIntValue(0, 1); // Terminate the file list
+
+ // This is the end of the prologue, so set the value of the symbol at the
+ // end of the prologue (that was used in a previous expression).
+ EmitLabel(ProEndSym);
+
+ // TODO: This is the point where the line tables would be emitted.
+
+ // Delete the MCLineSections that were created in
+ // MCMachOStreamer::MakeLineEntryForSection() and used to emit the line
+ // tables.
+ DenseMap<const MCSection *, MCLineSection *> &MCLineSections =
+ getContext().getMCLineSections();
+ for (DenseMap<const MCSection *, MCLineSection *>::iterator it =
+ MCLineSections.begin(), ie = MCLineSections.end(); it != ie; ++it) {
+ delete it->second;
+ }
+
+ // If there are no line tables emited then we emit:
+ // The following DW_LNE_set_address sequence to set the address to zero
+ // TODO test for 32-bit or 64-bit output
+ // This is the sequence for 32-bit code
+ EmitIntValue(0, 1);
+ EmitIntValue(5, 1);
+ EmitIntValue(2, 1);
+ EmitIntValue(0, 1);
+ EmitIntValue(0, 1);
+ EmitIntValue(0, 1);
+ EmitIntValue(0, 1);
+
+ // Lastly emit the DW_LNE_end_sequence which consists of 3 bytes '00 01 01'
+ // (00 is the code for extended opcodes, followed by a ULEB128 length of the
+ // extended opcode (01), and the DW_LNE_end_sequence (01).
+ EmitIntValue(0, 1); // DW_LNS_extended_op
+ EmitIntValue(1, 1); // ULEB128 length of the extended opcode
+ EmitIntValue(1, 1); // DW_LNE_end_sequence
+
+ // This is the end of the section, so set the value of the symbol at the end
+ // of this section (that was used in a previous expression).
+ EmitLabel(LineEndSym);
}
void MCMachOStreamer::Finish() {
- Assembler.Finish();
+ // Dump out the dwarf file and directory tables (soon to include line table)
+ EmitDwarfFileTable();
+
+ // We have to set the fragment atom associations so we can relax properly for
+ // Mach-O.
+
+ // First, scan the symbol table to build a lookup table from fragments to
+ // defining symbols.
+ DenseMap<const MCFragment*, MCSymbolData*> DefiningSymbolMap;
+ for (MCAssembler::symbol_iterator it = getAssembler().symbol_begin(),
+ ie = getAssembler().symbol_end(); it != ie; ++it) {
+ if (getAssembler().isSymbolLinkerVisible(it->getSymbol()) &&
+ it->getFragment()) {
+ // An atom defining symbol should never be internal to a fragment.
+ assert(it->getOffset() == 0 && "Invalid offset in atom defining symbol!");
+ DefiningSymbolMap[it->getFragment()] = it;
+ }
+ }
+
+ // Set the fragment atom associations by tracking the last seen atom defining
+ // symbol.
+ for (MCAssembler::iterator it = getAssembler().begin(),
+ ie = getAssembler().end(); it != ie; ++it) {
+ MCSymbolData *CurrentAtom = 0;
+ for (MCSectionData::iterator it2 = it->begin(),
+ ie2 = it->end(); it2 != ie2; ++it2) {
+ if (MCSymbolData *SD = DefiningSymbolMap.lookup(it2))
+ CurrentAtom = SD;
+ it2->setAtom(CurrentAtom);
+ }
+ }
+
+ this->MCObjectStreamer::Finish();
}
MCStreamer *llvm::createMachOStreamer(MCContext &Context, TargetAsmBackend &TAB,
projects / oota-llvm.git / blobdiff