Preliminary support for ARM frame save directives emission via MI flags.

This is just very first approximation how the stuff should be done
(e.g. ARM-only for now). More to follow.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127101 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 54 insertions, 0 deletions

diff --git a/lib/MC/MCAsmStreamer.cpp b/lib/MC/MCAsmStreamer.cpp
index a4ffd8a84e..c7ecf53c7f 100644
--- a/lib/MC/MCAsmStreamer.cpp
+++ b/lib/MC/MCAsmStreamer.cpp
@@ -197,6 +197,10 @@ public:
   virtual void EmitCantUnwind();
   virtual void EmitPersonality(const MCSymbol *Personality);
   virtual void EmitHandlerData();
+  virtual void EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset = 0);
+  virtual void EmitPad(int64_t Offset);
+  virtual void EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool);
+
 
   virtual void EmitInstruction(const MCInst &Inst);
 
@@ -890,6 +894,36 @@ void MCAsmStreamer::EmitPersonality(const MCSymbol *Personality) {
   EmitEOL();
 }
 
+void MCAsmStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) {
+  OS << "\t.setfp\t" << InstPrinter->getRegName(FpReg)
+     << ", "        << InstPrinter->getRegName(SpReg);
+  if (Offset)
+    OS << ", #" << Offset;
+  EmitEOL();
+}
+
+void MCAsmStreamer::EmitPad(int64_t Offset) {
+  OS << "\t.pad\t#" << Offset;
+  EmitEOL();
+}
+
+void MCAsmStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList,
+                                bool isVector) {
+  assert(RegList.size() && "RegList should not be empty");
+  if (isVector)
+    OS << "\t.vsave\t{";
+  else
+    OS << "\t.save\t{";
+
+  OS << InstPrinter->getRegName(RegList[0]);
+
+  for (unsigned i = 1, e = RegList.size(); i != e; ++i)
+    OS << ", " << InstPrinter->getRegName(RegList[i]);
+
+  OS << "}";
+  EmitEOL();
+}
+
 void MCAsmStreamer::EmitInstruction(const MCInst &Inst) {
   assert(getCurrentSection() && "Cannot emit contents before setting section!");
 
diff --git a/lib/MC/MCInstPrinter.cpp b/lib/MC/MCInstPrinter.cpp
index 92a71541f5..212b85eb1f 100644
--- a/lib/MC/MCInstPrinter.cpp
+++ b/lib/MC/MCInstPrinter.cpp
@@ -19,3 +19,8 @@ MCInstPrinter::~MCInstPrinter() {
 StringRef MCInstPrinter::getOpcodeName(unsigned Opcode) const {
   return "";
 }
+
+StringRef MCInstPrinter::getRegName(unsigned RegNo) const {
+  assert(0 && "Target should implement this");
+  return "";
+}
diff --git a/lib/MC/MCStreamer.cpp b/lib/MC/MCStreamer.cpp
index fa1e980b7c..1bd287b2b5 100644
--- a/lib/MC/MCStreamer.cpp
+++ b/lib/MC/MCStreamer.cpp
@@ -284,6 +284,21 @@ void MCStreamer::EmitPersonality(const MCSymbol *Personality) {
   abort();
 }
 
+void MCStreamer::EmitSetFP(unsigned FpReg, unsigned SpReg, int64_t Offset) {
+  errs() << "Not implemented yet\n";
+  abort();
+}
+
+void MCStreamer::EmitPad(int64_t Offset) {
+  errs() << "Not implemented yet\n";
+  abort();
+}
+
+void MCStreamer::EmitRegSave(const SmallVectorImpl<unsigned> &RegList, bool) {
+  errs() << "Not implemented yet\n";
+  abort();
+}
+
 /// EmitRawText - If this file is backed by an assembly streamer, this dumps
 /// the specified string in the output .s file.  This capability is
 /// indicated by the hasRawTextSupport() predicate.