1 files changed, 349 insertions, 0 deletions
diff --git a/contrib/llvm/lib/MC/WinCOFFStreamer.cpp b/contrib/llvm/lib/MC/WinCOFFStreamer.cpp
new file mode 100644
index 0000000..8a194bf
--- /dev/null
+++ b/contrib/llvm/lib/MC/WinCOFFStreamer.cpp
@@ -0,0 +1,349 @@
+//===-- llvm/MC/WinCOFFStreamer.cpp -----------------------------*- 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 an implementation of a Win32 COFF object file streamer.
+//
+//===----------------------------------------------------------------------===//
+
+#define DEBUG_TYPE "WinCOFFStreamer"
+
+#include "llvm/MC/MCObjectStreamer.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCSection.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCValue.h"
+#include "llvm/MC/MCAssembler.h"
+#include "llvm/MC/MCAsmLayout.h"
+#include "llvm/MC/MCCodeEmitter.h"
+#include "llvm/MC/MCSectionCOFF.h"
+#include "llvm/Target/TargetRegistry.h"
+#include "llvm/Target/TargetAsmBackend.h"
+#include "llvm/ADT/StringMap.h"
+
+#include "llvm/Support/COFF.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace llvm;
+
+namespace {
+class WinCOFFStreamer : public MCObjectStreamer {
+public:
+  MCSymbol const *CurSymbol;
+
+  WinCOFFStreamer(MCContext &Context,
+                  TargetAsmBackend &TAB,
+                  MCCodeEmitter &CE,
+                  raw_ostream &OS);
+
+  void AddCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+                       unsigned ByteAlignment, bool External);
+
+  // MCStreamer interface
+
+  virtual void EmitLabel(MCSymbol *Symbol);
+  virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
+  virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
+  virtual void EmitSymbolAttribute(MCSymbol *Symbol, MCSymbolAttr Attribute);
+  virtual void EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue);
+  virtual void BeginCOFFSymbolDef(MCSymbol const *Symbol);
+  virtual void EmitCOFFSymbolStorageClass(int StorageClass);
+  virtual void EmitCOFFSymbolType(int Type);
+  virtual void EndCOFFSymbolDef();
+  virtual void EmitELFSize(MCSymbol *Symbol, const MCExpr *Value);
+  virtual void EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+                                unsigned ByteAlignment);
+  virtual void EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size);
+  virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
+                            unsigned Size,unsigned ByteAlignment);
+  virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
+                              uint64_t Size, unsigned ByteAlignment);
+  virtual void EmitBytes(StringRef Data, unsigned AddrSpace);
+  virtual void EmitValue(const MCExpr *Value, unsigned Size,
+                         unsigned AddrSpace);
+  virtual void EmitGPRel32Value(const MCExpr *Value);
+  virtual void EmitValueToAlignment(unsigned ByteAlignment, int64_t Value,
+                                   unsigned ValueSize, unsigned MaxBytesToEmit);
+  virtual void EmitCodeAlignment(unsigned ByteAlignment,
+                                 unsigned MaxBytesToEmit);
+  virtual void EmitValueToOffset(const MCExpr *Offset, unsigned char Value);
+  virtual void EmitFileDirective(StringRef Filename);
+  virtual void EmitDwarfFileDirective(unsigned FileNo,StringRef Filename);
+  virtual void EmitInstruction(const MCInst &Instruction);
+  virtual void Finish();
+};
+} // end anonymous namespace.
+
+WinCOFFStreamer::WinCOFFStreamer(MCContext &Context,
+                                 TargetAsmBackend &TAB,
+                                 MCCodeEmitter &CE,
+                                 raw_ostream &OS)
+    : MCObjectStreamer(Context, TAB, OS, &CE)
+    , CurSymbol(NULL) {
+}
+
+void WinCOFFStreamer::AddCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+                                      unsigned ByteAlignment, bool External) {
+  assert(!Symbol->isInSection() && "Symbol must not already have a section!");
+
+  std::string SectionName(".bss$linkonce");
+  SectionName.append(Symbol->getName().begin(), Symbol->getName().end());
+
+  MCSymbolData &SymbolData = getAssembler().getOrCreateSymbolData(*Symbol);
+
+  unsigned Characteristics =
+    COFF::IMAGE_SCN_LNK_COMDAT |
+    COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA |
+    COFF::IMAGE_SCN_MEM_READ |
+    COFF::IMAGE_SCN_MEM_WRITE;
+
+  int Selection = COFF::IMAGE_COMDAT_SELECT_LARGEST;
+
+  const MCSection *Section = MCStreamer::getContext().getCOFFSection(
+    SectionName, Characteristics, Selection, SectionKind::getBSS());
+
+  MCSectionData &SectionData = getAssembler().getOrCreateSectionData(*Section);
+
+  if (SectionData.getAlignment() < ByteAlignment)
+    SectionData.setAlignment(ByteAlignment);
+
+  SymbolData.setExternal(External);
+
+  Symbol->setSection(*Section);
+
+  if (ByteAlignment != 1)
+      new MCAlignFragment(ByteAlignment, 0, 0, ByteAlignment, &SectionData);
+
+  SymbolData.setFragment(new MCFillFragment(0, 0, Size, &SectionData));
+}
+
+// MCStreamer interface
+
+void WinCOFFStreamer::EmitLabel(MCSymbol *Symbol) {
+  // TODO: This is copied almost exactly from the MachOStreamer. 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!");
+
+  Symbol->setSection(*CurSection);
+
+  MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
+
+  // 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 *DF = getOrCreateDataFragment();
+
+  assert(!SD.getFragment() && "Unexpected fragment on symbol data!");
+  SD.setFragment(DF);
+  SD.setOffset(DF->getContents().size());
+}
+
+void WinCOFFStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
+  llvm_unreachable("not implemented");
+}
+
+void WinCOFFStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
+  // TODO: This is exactly the same as MachOStreamer. Consider merging into
+  // MCObjectStreamer.
+  getAssembler().getOrCreateSymbolData(*Symbol);
+  AddValueSymbols(Value);
+  Symbol->setVariableValue(Value);
+}
+
+void WinCOFFStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
+                                          MCSymbolAttr Attribute) {
+  switch (Attribute) {
+  case MCSA_WeakReference:
+    getAssembler().getOrCreateSymbolData(*Symbol).modifyFlags(
+      COFF::SF_WeakReference,
+      COFF::SF_WeakReference);
+    break;
+
+  case MCSA_Global:
+    getAssembler().getOrCreateSymbolData(*Symbol).setExternal(true);
+    break;
+
+  default:
+    llvm_unreachable("unsupported attribute");
+    break;
+  }
+}
+
+void WinCOFFStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
+  llvm_unreachable("not implemented");
+}
+
+void WinCOFFStreamer::BeginCOFFSymbolDef(MCSymbol const *Symbol) {
+  assert(CurSymbol == NULL && "EndCOFFSymbolDef must be called between calls "
+                              "to BeginCOFFSymbolDef!");
+  CurSymbol = Symbol;
+}
+
+void WinCOFFStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {
+  assert(CurSymbol != NULL && "BeginCOFFSymbolDef must be called first!");
+  assert((StorageClass & ~0xFF) == 0 && "StorageClass must only have data in "
+                                        "the first byte!");
+
+  getAssembler().getOrCreateSymbolData(*CurSymbol).modifyFlags(
+    StorageClass << COFF::SF_ClassShift,
+    COFF::SF_ClassMask);
+}
+
+void WinCOFFStreamer::EmitCOFFSymbolType(int Type) {
+  assert(CurSymbol != NULL && "BeginCOFFSymbolDef must be called first!");
+  assert((Type & ~0xFFFF) == 0 && "Type must only have data in the first 2 "
+                                  "bytes");
+
+  getAssembler().getOrCreateSymbolData(*CurSymbol).modifyFlags(
+    Type << COFF::SF_TypeShift,
+    COFF::SF_TypeMask);
+}
+
+void WinCOFFStreamer::EndCOFFSymbolDef() {
+  assert(CurSymbol != NULL && "BeginCOFFSymbolDef must be called first!");
+  CurSymbol = NULL;
+}
+
+void WinCOFFStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
+  llvm_unreachable("not implemented");
+}
+
+void WinCOFFStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+                                       unsigned ByteAlignment) {
+  AddCommonSymbol(Symbol, Size, ByteAlignment, true);
+}
+
+void WinCOFFStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size) {
+  AddCommonSymbol(Symbol, Size, 1, false);
+}
+
+void WinCOFFStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
+                                   unsigned Size,unsigned ByteAlignment) {
+  llvm_unreachable("not implemented");
+}
+
+void WinCOFFStreamer::EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
+                                     uint64_t Size, unsigned ByteAlignment) {
+  llvm_unreachable("not implemented");
+}
+
+void WinCOFFStreamer::EmitBytes(StringRef Data, unsigned AddrSpace) {
+  // TODO: This is copied exactly from the MachOStreamer. Consider merging into
+  // MCObjectStreamer?
+  getOrCreateDataFragment()->getContents().append(Data.begin(), Data.end());
+}
+
+void WinCOFFStreamer::EmitValue(const MCExpr *Value, unsigned Size,
+                                unsigned AddrSpace) {
+  assert(AddrSpace == 0 && "Address space must be 0!");
+
+  // TODO: This is copied exactly from the MachOStreamer. Consider merging into
+  // MCObjectStreamer?
+  MCDataFragment *DF = getOrCreateDataFragment();
+
+  // Avoid fixups when possible.
+  int64_t AbsValue;
+  if (AddValueSymbols(Value)->EvaluateAsAbsolute(AbsValue)) {
+    // FIXME: Endianness assumption.
+    for (unsigned i = 0; i != Size; ++i)
+      DF->getContents().push_back(uint8_t(AbsValue >> (i * 8)));
+  } else {
+    DF->addFixup(MCFixup::Create(DF->getContents().size(),
+                                 AddValueSymbols(Value),
+                                 MCFixup::getKindForSize(Size)));
+    DF->getContents().resize(DF->getContents().size() + Size, 0);
+  }
+}
+
+void WinCOFFStreamer::EmitGPRel32Value(const MCExpr *Value) {
+  llvm_unreachable("not implemented");
+}
+
+void WinCOFFStreamer::EmitValueToAlignment(unsigned ByteAlignment,
+                                           int64_t Value,
+                                           unsigned ValueSize,
+                                           unsigned MaxBytesToEmit) {
+  // TODO: This is copied exactly from the MachOStreamer. Consider merging into
+  // MCObjectStreamer?
+  if (MaxBytesToEmit == 0)
+    MaxBytesToEmit = ByteAlignment;
+  new MCAlignFragment(ByteAlignment, Value, ValueSize, MaxBytesToEmit,
+                      getCurrentSectionData());
+
+  // Update the maximum alignment on the current section if necessary.
+  if (ByteAlignment > getCurrentSectionData()->getAlignment())
+    getCurrentSectionData()->setAlignment(ByteAlignment);
+}
+
+void WinCOFFStreamer::EmitCodeAlignment(unsigned ByteAlignment,
+                                        unsigned MaxBytesToEmit) {
+  // TODO: This is copied exactly from the MachOStreamer. Consider merging into
+  // MCObjectStreamer?
+  if (MaxBytesToEmit == 0)
+    MaxBytesToEmit = ByteAlignment;
+  MCAlignFragment *F = new MCAlignFragment(ByteAlignment, 0, 1, MaxBytesToEmit,
+                                           getCurrentSectionData());
+  F->setEmitNops(true);
+
+  // Update the maximum alignment on the current section if necessary.
+  if (ByteAlignment > getCurrentSectionData()->getAlignment())
+    getCurrentSectionData()->setAlignment(ByteAlignment);
+}
+
+void WinCOFFStreamer::EmitValueToOffset(const MCExpr *Offset,
+                                        unsigned char Value) {
+  llvm_unreachable("not implemented");
+}
+
+void WinCOFFStreamer::EmitFileDirective(StringRef Filename) {
+  // Ignore for now, linkers don't care, and proper debug
+  // info will be a much large effort.
+}
+
+void WinCOFFStreamer::EmitDwarfFileDirective(unsigned FileNo,
+                                             StringRef Filename) {
+  llvm_unreachable("not implemented");
+}
+
+void WinCOFFStreamer::EmitInstruction(const MCInst &Instruction) {
+  for (unsigned i = 0, e = Instruction.getNumOperands(); i != e; ++i)
+    if (Instruction.getOperand(i).isExpr())
+      AddValueSymbols(Instruction.getOperand(i).getExpr());
+
+  getCurrentSectionData()->setHasInstructions(true);
+
+  MCInstFragment *Fragment =
+    new MCInstFragment(Instruction, getCurrentSectionData());
+
+  raw_svector_ostream VecOS(Fragment->getCode());
+
+  getAssembler().getEmitter().EncodeInstruction(Instruction, VecOS,
+                                                Fragment->getFixups());
+}
+
+void WinCOFFStreamer::Finish() {
+  MCObjectStreamer::Finish();
+}
+
+namespace llvm
+{
+  MCStreamer *createWinCOFFStreamer(MCContext &Context,
+                                    TargetAsmBackend &TAB,
+                                    MCCodeEmitter &CE,
+                                    raw_ostream &OS,
+                                    bool RelaxAll) {
+    WinCOFFStreamer *S = new WinCOFFStreamer(Context, TAB, CE, OS);
+    S->getAssembler().setRelaxAll(RelaxAll);
+    return S;
+  }
+}