Start MCAsmStreamer implementation.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74044 91177308-0d34-0410-b5e6-96231b3b80d8
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);
+}