add a new EmitInlineAsm function to asmprinter to handle inline asm.

If we have an MCAsmStreamer, we continue to emit asm textually, 
otherwise we (currently) emit an error to errs and ignore it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100289 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/AsmPrinter.h

@@ -354,9 +354,12 @@ namespace llvm {
     /// isBlockOnlyReachableByFallthough - Return true if the basic block has
     /// exactly one predecessor and the control transfer mechanism between
     /// the predecessor and this block is a fall-through.
-    virtual bool isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const;
+    virtual bool
+    isBlockOnlyReachableByFallthrough(const MachineBasicBlock *MBB) const;
 
   private:
+    /// EmitInlineAsm - Emit a blob of inline asm to the output streamer.
+    void EmitInlineAsm(StringRef Str);
 
     /// processDebugLoc - Processes the debug information of each machine
     /// instruction's DebugLoc. 

include/llvm/MC/MCStreamer.h

@@ -62,9 +62,13 @@ class TargetAsmBackend;
     /// @name Assembly File Formatting.
     /// @{
     
-    /// isVerboseAsm - Return true if this streamer supports verbose assembly at
-    /// all.
+    /// isVerboseAsm - Return true if this streamer supports verbose assembly
+    /// and if it is enabled.
     virtual bool isVerboseAsm() const { return false; }
+    
+    /// hasRawTextSupport - Return true if this asm streamer supports emitting
+    /// unformatted text to the .s file with EmitRawText.
+    virtual bool hasRawTextSupport() const { return false; }
 
     /// AddComment - Add a comment that can be emitted to the generated .s
     /// file if applicable as a QoI issue to make the output of the compiler
@@ -278,6 +282,11 @@ class TargetAsmBackend;
     /// section.
     virtual void EmitInstruction(const MCInst &Inst) = 0;
 
+    /// EmitRawText - If this file is backed by a assembly streamer, this dumps
+    /// the specified string in the output .s file.  This capability is
+    /// indicated by the hasRawTextSupport() predicate.  By default this aborts.
+    virtual void EmitRawText(StringRef String);
+    
     /// Finish - Finish emission of machine code and flush any output.
     virtual void Finish() = 0;
   };

lib/CodeGen/AsmPrinter/AsmPrinter.cpp

@@ -125,14 +125,12 @@ bool AsmPrinter::doInitialization(Module &M) {
   for (GCModuleInfo::iterator I = MI->begin(), E = MI->end(); I != E; ++I)
     if (GCMetadataPrinter *MP = GetOrCreateGCPrinter(*I))
       MP->beginAssembly(O, *this, *MAI);
-  
+
+  // Emit module-level inline asm if it exists.
   if (!M.getModuleInlineAsm().empty()) {
     OutStreamer.AddComment("Start of file scope inline assembly");
     OutStreamer.AddBlankLine();
-    O << M.getModuleInlineAsm();
-    
-    if (*M.getModuleInlineAsm().rbegin() != '\n')
-      OutStreamer.AddBlankLine();
+    EmitInlineAsm(M.getModuleInlineAsm());
     OutStreamer.AddComment("End of file scope inline assembly");
     OutStreamer.AddBlankLine();
   }
@@ -879,6 +877,22 @@ void AsmPrinter::EmitXXStructorList(Constant *List) {
     }
 }
 
+/// EmitInlineAsm - Emit a blob of inline asm to the output streamer.
+void AsmPrinter::EmitInlineAsm(StringRef Str) {
+  assert(!Str.empty() && "Can't emit empty inline asm block");
+  
+  // If the output streamer is actually a .s file, just emit the blob textually.
+  // This is useful in case the asm parser doesn't handle something but the
+  // system assembler does.
+  if (OutStreamer.hasRawTextSupport()) {
+    OutStreamer.EmitRawText(Str);
+    return;
+  }
+  
+  errs() << "Inline asm not supported by this streamer!\n";
+}
+
+
 //===--------------------------------------------------------------------===//
 // Emission and print routines
 //

lib/MC/MCAsmStreamer.cpp

@@ -68,6 +68,9 @@ public:
   /// isVerboseAsm - Return true if this streamer supports verbose assembly at
   /// all.
   virtual bool isVerboseAsm() const { return IsVerboseAsm; }
+  
+  /// hasRawTextSupport - We support EmitRawText.
+  virtual bool hasRawTextSupport() const { return true; }
 
   /// AddComment - Add a comment that can be emitted to the generated .s
   /// file if applicable as a QoI issue to make the output of the compiler
@@ -145,6 +148,11 @@ public:
 
   virtual void EmitInstruction(const MCInst &Inst);
   
+  /// EmitRawText - If this file is backed by a assembly streamer, this dumps
+  /// the specified string in the output .s file.  This capability is
+  /// indicated by the hasRawTextSupport() predicate.
+  virtual void EmitRawText(StringRef String);
+  
   virtual void Finish();
   
   /// @}
@@ -195,7 +203,6 @@ void MCAsmStreamer::EmitCommentsAndEOL() {
   CommentStream.resync();
 }
 
-
 static inline int64_t truncateToSize(int64_t Value, unsigned Bytes) {
   assert(Bytes && "Invalid size!");
   return Value & ((uint64_t) (int64_t) -1 >> (64 - Bytes * 8));
@@ -634,6 +641,19 @@ void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
   EmitEOL();
 }
 
+/// EmitRawText - If this file is backed by a assembly streamer, this dumps
+/// the specified string in the output .s file.  This capability is
+/// indicated by the hasRawTextSupport() predicate.
+void MCAsmStreamer::EmitRawText(StringRef String) {
+  if (!CommentToEmit.empty() || CommentStream.GetNumBytesInBuffer() != 0)
+    EmitCommentsAndEOL();
+  
+  OS << String;
+  
+  if (!String.empty() && String.back() != '\n')
+    OS << '\n';
+}
+
 void MCAsmStreamer::Finish() {
   OS.flush();
 }

lib/MC/MCStreamer.cpp

@@ -44,3 +44,12 @@ void MCStreamer::EmitFill(uint64_t NumBytes, uint8_t FillValue,
   for (uint64_t i = 0, e = NumBytes; i != e; ++i)
     EmitValue(E, 1, AddrSpace);
 }
+
+/// EmitRawText - If this file is backed by a assembly streamer, this dumps
+/// the specified string in the output .s file.  This capability is
+/// indicated by the hasRawTextSupport() predicate.
+void MCStreamer::EmitRawText(StringRef String) {
+  errs() << "EmitRawText called on an MCStreamer that doesn't support it, "
+  " something must not be fully mc'ized\n";
+  abort();
+}