3 files changed, 42 insertions, 0 deletions
diff --git a/llvm/lib/MC/MCAsmStreamer.cpp b/llvm/lib/MC/MCAsmStreamer.cpp
index f9dbd5ad3f0..a6c4e282a2d 100644
--- a/llvm/lib/MC/MCAsmStreamer.cpp
+++ b/llvm/lib/MC/MCAsmStreamer.cpp
@@ -29,6 +29,7 @@
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/Format.h"
 #include "llvm/Support/FormattedStream.h"
+#include "llvm/Support/LEB128.h"
 #include "llvm/Support/MathExtras.h"
 #include "llvm/Support/Path.h"
 #include <cctype>
@@ -210,6 +211,8 @@ public:
   void EmitCFISameValue(int64_t Register) override;
   void EmitCFIRelOffset(int64_t Register, int64_t Offset) override;
   void EmitCFIAdjustCfaOffset(int64_t Adjustment) override;
+  void EmitCFIEscape(StringRef Values) override;
+  void EmitCFIGnuArgsSize(int64_t Size) override;
   void EmitCFISignalFrame() override;
   void EmitCFIUndefined(int64_t Register) override;
   void EmitCFIRegister(int64_t Register1, int64_t Register2) override;
@@ -1010,6 +1013,32 @@ void MCAsmStreamer::EmitCFIDefCfaOffset(int64_t Offset) {
   EmitEOL();
 }
 
+static void PrintCFIEscape(llvm::formatted_raw_ostream &OS, StringRef Values) {
+  OS << "\t.cfi_escape ";
+  if (!Values.empty()) {
+    size_t e = Values.size() - 1;
+    for (size_t i = 0; i < e; ++i)
+      OS << format("0x%02x", uint8_t(Values[i])) << ", ";
+    OS << format("0x%02x", uint8_t(Values[e]));
+  }
+}
+
+void MCAsmStreamer::EmitCFIEscape(StringRef Values) {
+  MCStreamer::EmitCFIEscape(Values);
+  PrintCFIEscape(OS, Values);
+  EmitEOL();
+}
+
+void MCAsmStreamer::EmitCFIGnuArgsSize(int64_t Size) {
+  MCStreamer::EmitCFIGnuArgsSize(Size);
+  
+  uint8_t Buffer[16] = { dwarf::DW_CFA_GNU_args_size };
+  unsigned Len = encodeULEB128(Size, Buffer + 1) + 1;
+  
+  PrintCFIEscape(OS, StringRef((const char *)&Buffer[0], Len));
+  EmitEOL();
+}
+
 void MCAsmStreamer::EmitCFIDefCfaRegister(int64_t Register) {
   MCStreamer::EmitCFIDefCfaRegister(Register);
   OS << "\t.cfi_def_cfa_register ";
diff --git a/llvm/lib/MC/MCDwarf.cpp b/llvm/lib/MC/MCDwarf.cpp
index 58cf652b68f..e964032b9d2 100644
--- a/llvm/lib/MC/MCDwarf.cpp
+++ b/llvm/lib/MC/MCDwarf.cpp
@@ -1147,6 +1147,11 @@ void FrameEmitterImpl::EmitCFIInstruction(MCObjectStreamer &Streamer,
     Streamer.EmitIntValue(dwarf::DW_CFA_restore | Reg, 1);
     return;
   }
+  case MCCFIInstruction::OpGnuArgsSize: {
+    Streamer.EmitIntValue(dwarf::DW_CFA_GNU_args_size, 1);
+    Streamer.EmitULEB128IntValue(Instr.getOffset());
+    return;
+  }
   case MCCFIInstruction::OpEscape:
     Streamer.EmitBytes(Instr.getValues());
     return;
diff --git a/llvm/lib/MC/MCStreamer.cpp b/llvm/lib/MC/MCStreamer.cpp
index 5d7685177b2..1ae1d51f2a3 100644
--- a/llvm/lib/MC/MCStreamer.cpp
+++ b/llvm/lib/MC/MCStreamer.cpp
@@ -359,6 +359,14 @@ void MCStreamer::EmitCFIEscape(StringRef Values) {
   CurFrame->Instructions.push_back(Instruction);
 }
 
+void MCStreamer::EmitCFIGnuArgsSize(int64_t Size) {
+  MCSymbol *Label = EmitCFICommon();
+  MCCFIInstruction Instruction = 
+    MCCFIInstruction::createGnuArgsSize(Label, Size);
+  MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();
+  CurFrame->Instructions.push_back(Instruction);
+}
+
 void MCStreamer::EmitCFISignalFrame() {
   EnsureValidDwarfFrame();
   MCDwarfFrameInfo *CurFrame = getCurrentDwarfFrameInfo();