1 files changed, 341 insertions, 0 deletions
diff --git a/contrib/llvm/lib/MC/WinCOFFStreamer.cpp b/contrib/llvm/lib/MC/WinCOFFStreamer.cpp
new file mode 100644
index 000000000000..5b5aad7a79ea
--- /dev/null
+++ b/contrib/llvm/lib/MC/WinCOFFStreamer.cpp
@@ -0,0 +1,341 @@
+//===-- 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/MCStreamer.h"
+#include "llvm/MC/MCAsmBackend.h"
+#include "llvm/MC/MCAsmLayout.h"
+#include "llvm/MC/MCAssembler.h"
+#include "llvm/MC/MCCodeEmitter.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCObjectStreamer.h"
+#include "llvm/MC/MCSection.h"
+#include "llvm/MC/MCSectionCOFF.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MCValue.h"
+#include "llvm/MC/MCWin64EH.h"
+#include "llvm/Support/COFF.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/TargetRegistry.h"
+#include "llvm/Support/raw_ostream.h"
+
+using namespace llvm;
+
+namespace {
+class WinCOFFStreamer : public MCObjectStreamer {
+public:
+  MCSymbol const *CurSymbol;
+
+  WinCOFFStreamer(MCContext &Context,
+                  MCAsmBackend &MAB,
+                  MCCodeEmitter &CE,
+                  raw_ostream &OS);
+
+  void AddCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+                       unsigned ByteAlignment, bool External);
+
+  // MCStreamer interface
+
+  virtual void InitSections();
+  virtual void InitToTextSection();
+  virtual void EmitLabel(MCSymbol *Symbol);
+  virtual void EmitDebugLabel(MCSymbol *Symbol);
+  virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
+  virtual void EmitThumbFunc(MCSymbol *Func);
+  virtual bool 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 EmitCOFFSecRel32(MCSymbol const *Symbol);
+  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,
+                                     unsigned ByteAlignment);
+  virtual void EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
+                            uint64_t Size,unsigned ByteAlignment);
+  virtual void EmitTBSSSymbol(const MCSection *Section, MCSymbol *Symbol,
+                              uint64_t Size, unsigned ByteAlignment);
+  virtual void EmitFileDirective(StringRef Filename);
+  virtual void EmitIdent(StringRef IdentString);
+  virtual void EmitWin64EHHandlerData();
+  virtual void FinishImpl();
+
+private:
+  virtual void 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->getFixups().push_back(Fixups[i]);
+    }
+    DF->getContents().append(Code.begin(), Code.end());
+  }
+
+  void SetSection(StringRef Section,
+                  unsigned Characteristics,
+                  SectionKind Kind) {
+    SwitchSection(getContext().getCOFFSection(Section, Characteristics, Kind));
+  }
+
+  void SetSectionText() {
+    SetSection(".text",
+               COFF::IMAGE_SCN_CNT_CODE
+             | COFF::IMAGE_SCN_MEM_EXECUTE
+             | COFF::IMAGE_SCN_MEM_READ,
+               SectionKind::getText());
+    EmitCodeAlignment(4, 0);
+  }
+
+  void SetSectionData() {
+    SetSection(".data",
+               COFF::IMAGE_SCN_CNT_INITIALIZED_DATA
+             | COFF::IMAGE_SCN_MEM_READ
+             | COFF::IMAGE_SCN_MEM_WRITE,
+               SectionKind::getDataRel());
+    EmitCodeAlignment(4, 0);
+  }
+
+  void SetSectionBSS() {
+    SetSection(".bss",
+               COFF::IMAGE_SCN_CNT_UNINITIALIZED_DATA
+             | COFF::IMAGE_SCN_MEM_READ
+             | COFF::IMAGE_SCN_MEM_WRITE,
+               SectionKind::getBSS());
+    EmitCodeAlignment(4, 0);
+  }
+};
+} // end anonymous namespace.
+
+WinCOFFStreamer::WinCOFFStreamer(MCContext &Context, MCAsmBackend &MAB,
+                                 MCCodeEmitter &CE, raw_ostream &OS)
+    : MCObjectStreamer(Context, 0, MAB, 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, SectionKind::getBSS(), Symbol->getName(),
+      Selection);
+
+  MCSectionData &SectionData = getAssembler().getOrCreateSectionData(*Section);
+
+  if (SectionData.getAlignment() < ByteAlignment)
+    SectionData.setAlignment(ByteAlignment);
+
+  SymbolData.setExternal(External);
+
+  AssignSection(Symbol, Section);
+
+  if (ByteAlignment != 1)
+      new MCAlignFragment(ByteAlignment, 0, 0, ByteAlignment, &SectionData);
+
+  SymbolData.setFragment(new MCFillFragment(0, 0, Size, &SectionData));
+}
+
+// MCStreamer interface
+
+void WinCOFFStreamer::InitToTextSection() {
+  SetSectionText();
+}
+
+void WinCOFFStreamer::InitSections() {
+  SetSectionText();
+  SetSectionData();
+  SetSectionBSS();
+  SetSectionText();
+}
+
+void WinCOFFStreamer::EmitLabel(MCSymbol *Symbol) {
+  assert(Symbol->isUndefined() && "Cannot define a symbol twice!");
+  MCObjectStreamer::EmitLabel(Symbol);
+}
+
+void WinCOFFStreamer::EmitDebugLabel(MCSymbol *Symbol) {
+  EmitLabel(Symbol);
+}
+void WinCOFFStreamer::EmitAssemblerFlag(MCAssemblerFlag Flag) {
+  llvm_unreachable("not implemented");
+}
+
+void WinCOFFStreamer::EmitThumbFunc(MCSymbol *Func) {
+  llvm_unreachable("not implemented");
+}
+
+bool WinCOFFStreamer::EmitSymbolAttribute(MCSymbol *Symbol,
+                                          MCSymbolAttr Attribute) {
+  assert(Symbol && "Symbol must be non-null!");
+  assert((Symbol->isInSection()
+         ? Symbol->getSection().getVariant() == MCSection::SV_COFF
+         : true) && "Got non COFF section in the COFF backend!");
+  switch (Attribute) {
+  case MCSA_WeakReference:
+  case MCSA_Weak: {
+      MCSymbolData &SD = getAssembler().getOrCreateSymbolData(*Symbol);
+      SD.modifyFlags(COFF::SF_WeakExternal, COFF::SF_WeakExternal);
+      SD.setExternal(true);
+    }
+    break;
+
+  case MCSA_Global:
+    getAssembler().getOrCreateSymbolData(*Symbol).setExternal(true);
+    break;
+
+  default:
+    return false;
+  }
+
+  return true;
+}
+
+void WinCOFFStreamer::EmitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
+  llvm_unreachable("not implemented");
+}
+
+void WinCOFFStreamer::BeginCOFFSymbolDef(MCSymbol const *Symbol) {
+  assert((Symbol->isInSection()
+         ? Symbol->getSection().getVariant() == MCSection::SV_COFF
+         : true) && "Got non COFF section in the COFF backend!");
+  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::EmitCOFFSecRel32(MCSymbol const *Symbol)
+{
+  MCDataFragment *DF = getOrCreateDataFragment();
+
+  DF->getFixups().push_back(
+      MCFixup::Create(DF->getContents().size(),
+                      MCSymbolRefExpr::Create (Symbol, getContext ()),
+                      FK_SecRel_4));
+  DF->getContents().resize(DF->getContents().size() + 4, 0);
+}
+
+void WinCOFFStreamer::EmitELFSize(MCSymbol *Symbol, const MCExpr *Value) {
+  llvm_unreachable("not implemented");
+}
+
+void WinCOFFStreamer::EmitCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+                                       unsigned ByteAlignment) {
+  assert((Symbol->isInSection()
+         ? Symbol->getSection().getVariant() == MCSection::SV_COFF
+         : true) && "Got non COFF section in the COFF backend!");
+  AddCommonSymbol(Symbol, Size, ByteAlignment, true);
+}
+
+void WinCOFFStreamer::EmitLocalCommonSymbol(MCSymbol *Symbol, uint64_t Size,
+                                            unsigned ByteAlignment) {
+  assert((Symbol->isInSection()
+         ? Symbol->getSection().getVariant() == MCSection::SV_COFF
+         : true) && "Got non COFF section in the COFF backend!");
+  AddCommonSymbol(Symbol, Size, ByteAlignment, false);
+}
+
+void WinCOFFStreamer::EmitZerofill(const MCSection *Section, MCSymbol *Symbol,
+                                   uint64_t 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::EmitFileDirective(StringRef Filename) {
+  // Ignore for now, linkers don't care, and proper debug
+  // info will be a much large effort.
+}
+
+// TODO: Implement this if you want to emit .comment section in COFF obj files.
+void WinCOFFStreamer::EmitIdent(StringRef IdentString) {
+  llvm_unreachable("unsupported directive");
+}
+
+void WinCOFFStreamer::EmitWin64EHHandlerData() {
+  MCStreamer::EmitWin64EHHandlerData();
+
+  // We have to emit the unwind info now, because this directive
+  // actually switches to the .xdata section!
+  MCWin64EHUnwindEmitter::EmitUnwindInfo(*this, getCurrentW64UnwindInfo());
+}
+
+void WinCOFFStreamer::FinishImpl() {
+  EmitFrames(NULL, true);
+  EmitW64Tables();
+  MCObjectStreamer::FinishImpl();
+}
+
+namespace llvm
+{
+  MCStreamer *createWinCOFFStreamer(MCContext &Context,
+                                    MCAsmBackend &MAB,
+                                    MCCodeEmitter &CE,
+                                    raw_ostream &OS,
+                                    bool RelaxAll) {
+    WinCOFFStreamer *S = new WinCOFFStreamer(Context, MAB, CE, OS);
+    S->getAssembler().setRelaxAll(RelaxAll);
+    return S;
+  }
+}