Start MCAsmStreamer implementation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74044 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/MC/MCAtom.h

@@ -17,6 +17,8 @@ namespace llvm {
 
   public:
     MCAtom(MCSection *_Section) : Section(_Section) {}
+
+    MCSection *getSection() { return Section; }
   };
 
 } // end namespace llvm

include/llvm/MC/MCContext.h

@@ -113,7 +113,7 @@ namespace llvm {
 ///                  allocator supports it).
 /// @return The allocated memory. Could be NULL.
 inline void *operator new(size_t Bytes, llvm::MCContext &C,
-                          size_t Alignment) throw () {
+                          size_t Alignment = 16) throw () {
   return C.Allocate(Bytes, Alignment);
 }
 /// @brief Placement delete companion to the new above.

include/llvm/MC/MCSection.h

@@ -19,6 +19,8 @@ namespace llvm {
 
   public:
     MCSection(const char *_Name) : Name(_Name) {}
+
+    const std::string &getName() const { return Name; }
   };
 
 } // end namespace llvm

include/llvm/MC/MCStreamer.h

@@ -84,7 +84,7 @@ namespace llvm {
     // the symbol and make the printer smart enough to add the right symbols?
     // This should work as long as the order of attributes in the file doesn't
     // matter.
-    virtual void EmitSymbolAttribute(MCSymbol *Symbol, 
+    virtual void EmitSymbolAttribute(MCSymbol *Symbol,
                                      SymbolAttr Attribute) = 0;
 
     /// EmitBytes - Emit @param Length bytes starting at @param Data into the
@@ -116,7 +116,7 @@ namespace llvm {
   /// createAsmStreamer - Create a machine code streamer which will print out
   /// assembly for the native target, suitable for compiling with a native
   /// assembler.
-  inline MCStreamer *createAsmStreamer(MCContext &Ctx, raw_ostream &OS) { return 0; }
+  MCStreamer *createAsmStreamer(MCContext &Ctx, raw_ostream &OS);
 
   // FIXME: These two may end up getting rolled into a single
   // createObjectStreamer interface, which implements the assembler backend, and

include/llvm/MC/MCSymbol.h

@@ -23,6 +23,10 @@ namespace llvm {
   public:
     MCSymbol(MCAtom *_Atom, const char *_Name, bool _IsTemporary) 
       : Atom(_Atom), Name(_Name), IsTemporary(_IsTemporary) {}
+
+    MCAtom *getAtom() { return Atom; }
+
+    const std::string &getName() { return Name; }
   };
 
 } // end namespace llvm

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);
+}

lib/MC/MCContext.cpp

@@ -26,13 +26,13 @@ MCSection *MCContext::GetSection(const char *Name) {
   MCSection *&Entry = Sections[Name];
   
   if (!Entry)
-    Entry = new (this) MCSection(Name);
+    Entry = new (*this) MCSection(Name);
 
   return Entry;
 }
     
 MCAtom *MCContext::CreateAtom(MCSection *Section) {
-  return new (this) MCAtom(Section);
+  return new (*this) MCAtom(Section);
 }
 
 MCSymbol *MCContext::CreateSymbol(MCAtom *Atom, const char *Name) {
@@ -41,18 +41,18 @@ MCSymbol *MCContext::CreateSymbol(MCAtom *Atom, const char *Name) {
   // Create and bind the symbol, and ensure that names are unique.
   MCSymbol *&Entry = Symbols[Name];
   assert(!Entry && "Duplicate symbol definition!");
-  return Entry = new (this) MCSymbol(Atom, Name, false);
+  return Entry = new (*this) MCSymbol(Atom, Name, false);
 }
 
 MCSymbol *MCContext::CreateTemporarySymbol(MCAtom *Atom, const char *Name) {
   // If unnamed, just create a symbol.
   if (Name[0] == '\0')
-    new (this) MCSymbol(Atom, "", true);
+    new (*this) MCSymbol(Atom, "", true);
     
   // Otherwise create as usual.
   MCSymbol *&Entry = Symbols[Name];
   assert(!Entry && "Duplicate symbol definition!");
-  return Entry = new (this) MCSymbol(Atom, Name, true);
+  return Entry = new (*this) MCSymbol(Atom, Name, true);
 }
 
 MCSymbol *MCContext::LookupSymbol(const char *Name) const {

lib/MC/MCStreamer.cpp

@@ -0,0 +1,18 @@
+//===- lib/MC/MCStreamer.cpp - Streaming Machine Code 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"
+
+using namespace llvm;
+
+MCStreamer::MCStreamer(MCContext &_Context) : Context(_Context) {
+}
+
+MCStreamer::~MCStreamer() {
+}

unittests/MC/AsmStreamerTest.cpp

@@ -0,0 +1,52 @@
+//===- AsmStreamerTest.cpp - Triple unit tests ----------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "gtest/gtest.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/Support/raw_ostream.h"
+using namespace llvm;
+
+namespace {
+
+// Helper class.
+class StringAsmStreamer {
+  std::string Str;
+  raw_string_ostream OS;
+  MCContext Context;
+  MCStreamer *Streamer;
+
+public:
+  StringAsmStreamer() : OS(Str), Streamer(createAsmStreamer(Context, OS)) {}
+  ~StringAsmStreamer() { 
+    delete Streamer;
+  }
+
+  MCContext &getContext() { return Context; }
+  MCStreamer &getStreamer() { return *Streamer; }
+
+  const std::string &getString() {
+    Streamer->Finish();
+    return Str;
+  }
+};
+
+TEST(AsmStreamer, EmptyOutput) {
+  StringAsmStreamer S;
+  EXPECT_EQ(S.getString(), "");
+}
+
+TEST(AsmStreamer, Sections) {
+  StringAsmStreamer S;
+  MCSection *Sec0 = S.getContext().GetSection("foo");
+  S.getStreamer().SwitchSection(Sec0);
+  EXPECT_EQ(S.getString(), ".section foo\n");
+}
+
+}

unittests/MC/Makefile

@@ -0,0 +1,15 @@
+##===- unittests/MC/Makefile -------------------------------*- Makefile -*-===##
+#
+#                     The LLVM Compiler Infrastructure
+#
+# This file is distributed under the University of Illinois Open Source
+# License. See LICENSE.TXT for details.
+#
+##===----------------------------------------------------------------------===##
+
+LEVEL = ../..
+TESTNAME = MC
+LINK_COMPONENTS := core support mc
+
+include $(LEVEL)/Makefile.config
+include $(LLVM_SRC_ROOT)/unittests/Makefile.unittest

unittests/Makefile

@@ -16,7 +16,7 @@ BUILD_ARCHIVE = 1
 CPP.Flags += -I$(LLVM_SRC_ROOT)/utils/unittest/googletest/include/
 CPP.Flags += -Wno-variadic-macros
 
-PARALLEL_DIRS = ADT Support VMCore
+PARALLEL_DIRS = ADT Support VMCore MC
 
 include $(LEVEL)/Makefile.common