add a new DwarfPrinter::EmitEncodingByte method which handles

pretty printing encoding comments and eliminates redundancy on
the client side.  We now get pretty dwarf like this again:

        .byte   255                                         ## @LPStart Encoding = omit
        .byte   0                                           ## @TType Encoding = absptr
        .byte   0x28                                        ## @TType base offset
        .byte   3                                           ## Call site Encoding = udata4
        .byte   0x1a                                        ## Call site table size
...


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94239 91177308-0d34-0410-b5e6-96231b3b80d8

4 files changed, 59 insertions, 66 deletions

diff --git a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index ed2aac013b..87afee0cc3 100644
--- a/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -703,56 +703,6 @@ void AsmPrinter::EOL(const Twine &Comment) const {
   O << '\n';
 }
 
-static const char *DecodeDWARFEncoding(unsigned Encoding) {
-  switch (Encoding) {
-  case dwarf::DW_EH_PE_absptr:
-    return "absptr";
-  case dwarf::DW_EH_PE_omit:
-    return "omit";
-  case dwarf::DW_EH_PE_pcrel:
-    return "pcrel";
-  case dwarf::DW_EH_PE_udata4:
-    return "udata4";
-  case dwarf::DW_EH_PE_udata8:
-    return "udata8";
-  case dwarf::DW_EH_PE_sdata4:
-    return "sdata4";
-  case dwarf::DW_EH_PE_sdata8:
-    return "sdata8";
-  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata4:
-    return "pcrel udata4";
-  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4:
-    return "pcrel sdata4";
-  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8:
-    return "pcrel udata8";
-  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8:
-    return "pcrel sdata8";
-  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata4:
-    return "indirect pcrel udata4";
-  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata4:
-    return "indirect pcrel sdata4";
-  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata8:
-    return "indirect pcrel udata8";
-  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata8:
-    return "indirect pcrel sdata8";
-  }
-
-  return 0;
-}
-
-void AsmPrinter::EOL(const Twine &Comment, unsigned Encoding) const {
-  if (VerboseAsm && !Comment.isTriviallyEmpty()) {
-    O.PadToColumn(MAI->getCommentColumn());
-    O << MAI->getCommentString()
-      << ' '
-      << Comment;
-
-    if (const char *EncStr = DecodeDWARFEncoding(Encoding))
-      O << " (" << EncStr << ')';
-  }
-  O << '\n';
-}
-
 /// EmitULEB128Bytes - Emit an assembler byte data directive to compose an
 /// unsigned leb128 value.
 void AsmPrinter::EmitULEB128Bytes(unsigned Value) const {
diff --git a/lib/CodeGen/AsmPrinter/DwarfException.cpp b/lib/CodeGen/AsmPrinter/DwarfException.cpp
index 9f5311401f..43b1abf05d 100644
--- a/lib/CodeGen/AsmPrinter/DwarfException.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfException.cpp
@@ -185,8 +185,7 @@ void DwarfException::EmitCIE(const Function *PersonalityFn, unsigned Index) {
   Asm->EmitULEB128Bytes(AugmentationSize);
   Asm->EOL("Augmentation Size");
 
-  Asm->EmitInt8(PerEncoding);
-  Asm->EOL("Personality", PerEncoding);
+  EmitEncodingByte(PerEncoding, "Personality");
 
   // If there is a personality, we need to indicate the function's location.
   if (PersonalityRef) {
@@ -197,11 +196,8 @@ void DwarfException::EmitCIE(const Function *PersonalityFn, unsigned Index) {
     O << MAI->getData32bitsDirective() << *PersonalityRef;
     Asm->EOL("Personality");
 
-    Asm->EmitInt8(LSDAEncoding);
-    Asm->EOL("LSDA Encoding", LSDAEncoding);
-
-    Asm->EmitInt8(FDEEncoding);
-    Asm->EOL("FDE Encoding", FDEEncoding);
+    EmitEncodingByte(LSDAEncoding, "LSDA");
+    EmitEncodingByte(FDEEncoding, "FDE");
   }
 
   // Indicate locations of general callee saved registers in frame.
@@ -784,11 +780,8 @@ void DwarfException::EmitExceptionTable() {
   }
 
   // Emit the header.
-  Asm->EmitInt8(dwarf::DW_EH_PE_omit);
-  Asm->EOL("@LPStart format", dwarf::DW_EH_PE_omit);
-
-  Asm->EmitInt8(TTypeFormat);
-  Asm->EOL("@TType format", TTypeFormat);
+  EmitEncodingByte(dwarf::DW_EH_PE_omit, "@LPStart");
+  EmitEncodingByte(TTypeFormat, "@TType");
 
   if (HaveTTData) {
     Asm->EmitULEB128Bytes(TyOffset);
@@ -797,8 +790,7 @@ void DwarfException::EmitExceptionTable() {
 
   // SjLj Exception handling
   if (IsSJLJ) {
-    Asm->EmitInt8(dwarf::DW_EH_PE_udata4);
-    Asm->EOL("Call site format", dwarf::DW_EH_PE_udata4);
+    EmitEncodingByte(dwarf::DW_EH_PE_udata4, "Call site");
     Asm->EmitULEB128Bytes(SizeSites);
     Asm->EOL("Call site table length");
 
@@ -842,8 +834,7 @@ void DwarfException::EmitExceptionTable() {
     // supposed to throw.
 
     // Emit the landing pad call site table.
-    Asm->EmitInt8(dwarf::DW_EH_PE_udata4);
-    Asm->EOL("Call site format", dwarf::DW_EH_PE_udata4);
+    EmitEncodingByte(dwarf::DW_EH_PE_udata4, "Call site");
     Asm->EmitULEB128Bytes(SizeSites);
     Asm->EOL("Call site table size");
 
diff --git a/lib/CodeGen/AsmPrinter/DwarfPrinter.cpp b/lib/CodeGen/AsmPrinter/DwarfPrinter.cpp
index f50c684e35..99b46d61a0 100644
--- a/lib/CodeGen/AsmPrinter/DwarfPrinter.cpp
+++ b/lib/CodeGen/AsmPrinter/DwarfPrinter.cpp
@@ -18,6 +18,7 @@
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineModuleInfo.h"
 #include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCStreamer.h"
 #include "llvm/MC/MCSymbol.h"
 #include "llvm/Target/TargetData.h"
 #include "llvm/Target/TargetFrameInfo.h"
@@ -41,6 +42,50 @@ void DwarfPrinter::PrintRelDirective(bool Force32Bit, bool isInSection) const {
     O << MAI->getData64bitsDirective();
 }
 
+static const char *DecodeDWARFEncoding(unsigned Encoding) {
+  switch (Encoding) {
+  case dwarf::DW_EH_PE_absptr: return "absptr";
+  case dwarf::DW_EH_PE_omit:   return "omit";
+  case dwarf::DW_EH_PE_pcrel:  return "pcrel";
+  case dwarf::DW_EH_PE_udata4: return "udata4";
+  case dwarf::DW_EH_PE_udata8: return "udata8";
+  case dwarf::DW_EH_PE_sdata4: return "sdata4";
+  case dwarf::DW_EH_PE_sdata8: return "sdata8";
+  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata4: return "pcrel udata4";
+  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4: return "pcrel sdata4";
+  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8: return "pcrel udata8";
+  case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8: return "pcrel sdata8";
+  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata4:
+    return "indirect pcrel udata4";
+  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata4:
+    return "indirect pcrel sdata4";
+  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata8:
+    return "indirect pcrel udata8";
+  case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata8:
+    return "indirect pcrel sdata8";
+  }
+  
+  return "<unknown encoding>";
+}
+
+/// EmitEncodingByte - Emit a .byte 42 directive that corresponds to an
+/// encoding.  If verbose assembly output is enabled, we output comments
+/// describing the encoding.  Desc is an optional string saying what the
+/// encoding is specifying (e.g. "LSDA").
+void DwarfPrinter::EmitEncodingByte(unsigned Val, const char *Desc) {
+  if (Asm->VerboseAsm) {
+    if (Desc != 0)
+      Asm->OutStreamer.AddComment(Twine(Desc)+" Encoding = " +
+                                  Twine(DecodeDWARFEncoding(Val)));
+    else
+      Asm->OutStreamer.AddComment(Twine("Encoding = ") +
+                                  DecodeDWARFEncoding(Val));
+  }
+
+  Asm->OutStreamer.EmitIntValue(Val, 1, 0/*addrspace*/);
+}
+
+
 /// PrintLabelName - Print label name in form used by Dwarf writer.
 ///
 void DwarfPrinter::PrintLabelName(const char *Tag, unsigned Number) const {
diff --git a/lib/CodeGen/AsmPrinter/DwarfPrinter.h b/lib/CodeGen/AsmPrinter/DwarfPrinter.h
index 78b80d9a25..d76caf9a4e 100644
--- a/lib/CodeGen/AsmPrinter/DwarfPrinter.h
+++ b/lib/CodeGen/AsmPrinter/DwarfPrinter.h
@@ -73,6 +73,7 @@ protected:
   DwarfPrinter(raw_ostream &OS, AsmPrinter *A, const MCAsmInfo *T,
                const char *flavor);
 public:
+  
   //===------------------------------------------------------------------===//
   // Accessors.
   //
@@ -84,6 +85,12 @@ public:
   void PrintRelDirective(bool Force32Bit = false,
                          bool isInSection = false) const;
 
+  /// EmitEncodingByte - Emit a .byte 42 directive that corresponds to an
+  /// encoding.  If verbose assembly output is enabled, we output comments
+  /// describing the encoding.  Desc is an optional string saying what the
+  /// encoding is specifying (e.g. "LSDA").
+  void EmitEncodingByte(unsigned Val, const char *Desc = 0);
+  
 
   /// PrintLabelName - Print label name in form used by Dwarf writer.
   ///