1 files changed, 143 insertions, 0 deletions
diff --git a/lib/MC/MCAsmStreamer.cpp b/lib/MC/MCAsmStreamer.cpp
new file mode 100644
index 0000000..1956c2e
--- /dev/null
+++ b/lib/MC/MCAsmStreamer.cpp
@@ -0,0 +1,143 @@
+//===- lib/MC/MCAsmStreamer.cpp - Text Assembly Output --------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/MC/MCStreamer.h"
+
+#include "llvm/MC/MCAtom.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCSection.h"
+#include "llvm/MC/MCSymbol.h"
+#include "llvm/MC/MCValue.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace llvm;
+
+namespace {
+
+  class MCAsmStreamer : public MCStreamer {
+    raw_ostream &OS;
+
+    MCSection *CurSection;
+
+  public:
+    MCAsmStreamer(MCContext &Context, raw_ostream &_OS)
+      : MCStreamer(Context), OS(_OS) {}
+    ~MCAsmStreamer() {}
+
+    /// @name MCStreamer Interface
+    /// @{
+
+    virtual void SwitchSection(MCSection *Section);
+
+    virtual void EmitLabel(MCSymbol *Symbol);
+
+    virtual void EmitAssignment(MCSymbol *Symbol, const MCValue &Value,
+                                bool MakeAbsolute = false);
+
+    virtual void EmitSymbolAttribute(MCSymbol *Symbol, SymbolAttr Attribute);
+
+    virtual void EmitBytes(const char *Data, unsigned Length);
+
+    virtual void EmitValue(const MCValue &Value, unsigned Size);
+
+    virtual void EmitInstruction(const MCInst &Inst);
+
+    virtual void Finish();
+    
+    /// @}
+  };
+
+}
+
+/// Allow printing values directly to a raw_ostream.
+inline raw_ostream &operator<<(raw_ostream &os, const MCValue &Value) {
+  if (Value.getSymA()) {
+    os << Value.getSymA()->getName();
+    if (Value.getSymB())
+      os << " - " << Value.getSymB()->getName();
+    if (Value.getCst())
+      os << " + " << Value.getCst();
+  } else {
+    assert(!Value.getSymB() && "Invalid machine code value!");
+    os << Value.getCst();
+  }
+
+  return os;
+}
+
+void MCAsmStreamer::SwitchSection(MCSection *Section) {
+  if (Section != CurSection) {
+    CurSection = Section;
+
+    // FIXME: Really we would like the segment, flags, etc. to be separate
+    // values instead of embedded in the name. Not all assemblers understand all
+    // this stuff though.
+    OS << ".section " << Section->getName() << "\n";
+  }
+}
+
+void MCAsmStreamer::EmitLabel(MCSymbol *Symbol) {
+  // FIXME: We need to enforce that we aren't printing atoms which are more
+  // complicated than the assembler understands.
+  assert(Symbol->getAtom()->getSection() == CurSection && 
+         "The label for a symbol must match its section!");
+  OS << Symbol->getName() << ":\n";
+}
+
+void MCAsmStreamer::EmitAssignment(MCSymbol *Symbol, const MCValue &Value,
+                                   bool MakeAbsolute) {
+  if (MakeAbsolute) {
+    OS << ".set " << Symbol->getName() << ", " << Value << '\n';
+  } else {
+    OS << Symbol->getName() << " = " << Value << '\n';
+  }
+}
+
+void MCAsmStreamer::EmitSymbolAttribute(MCSymbol *Symbol, 
+                                        SymbolAttr Attribute) {
+  switch (Attribute) {
+  case Global: OS << ".globl"; break;
+  case Weak: OS << ".weak"; break;
+  case PrivateExtern: OS << ".private_extern"; break;
+  }
+
+  OS << ' ' << Symbol->getName() << '\n';
+}
+
+void MCAsmStreamer::EmitBytes(const char *Data, unsigned Length) {
+  for (unsigned i = 0; i != Length; ++i) {
+    OS << ".byte " << (unsigned) Data[i] << '\n';
+  }
+}
+
+void MCAsmStreamer::EmitValue(const MCValue &Value, unsigned Size) {
+  // Need target hooks to know how to print this.
+  switch (Size) {
+  default:
+    assert(0 && "Invalid size for machine code value!");
+  case 1: OS << ".byte"; break;
+  case 2: OS << ".hword"; break;
+  case 4: OS << ".long"; break;
+  case 8: OS << ".quad"; break;
+  }
+
+  OS << ' ' << Value << '\n';
+}
+
+void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
+  // FIXME: Implement.
+  OS << "# FIXME: Implement instruction printing!\n";
+}
+
+void MCAsmStreamer::Finish() {
+  OS.flush();
+}
+    
+MCStreamer *llvm::createAsmStreamer(MCContext &Context, raw_ostream &OS) {
+  return new MCAsmStreamer(Context, OS);
+}