Add support for leb128 of absolute expressions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113691 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 49 insertions, 23 deletions

diff --git a/lib/MC/MCParser/AsmParser.cpp b/lib/MC/MCParser/AsmParser.cpp
index 0a664fd..5ef6f68 100644
--- a/lib/MC/MCParser/AsmParser.cpp
+++ b/lib/MC/MCParser/AsmParser.cpp
@@ -238,6 +238,9 @@ public:
     AddDirectiveHandler<&GenericAsmParser::ParseDirectiveMacro>(".macro");
     AddDirectiveHandler<&GenericAsmParser::ParseDirectiveEndMacro>(".endm");
     AddDirectiveHandler<&GenericAsmParser::ParseDirectiveEndMacro>(".endmacro");
+
+    AddDirectiveHandler<&GenericAsmParser::ParseDirectiveLEB128>(".sleb128");
+    AddDirectiveHandler<&GenericAsmParser::ParseDirectiveLEB128>(".uleb128");
   }
 
   bool ParseDirectiveFile(StringRef, SMLoc DirectiveLoc);
@@ -247,6 +250,10 @@ public:
   bool ParseDirectiveMacrosOnOff(StringRef, SMLoc DirectiveLoc);
   bool ParseDirectiveMacro(StringRef, SMLoc DirectiveLoc);
   bool ParseDirectiveEndMacro(StringRef, SMLoc DirectiveLoc);
+
+  void ParseUleb128(uint64_t Value);
+  void ParseSleb128(int64_t Value);
+  bool ParseDirectiveLEB128(StringRef, SMLoc);
 };
 
 }
@@ -2049,6 +2056,48 @@ bool GenericAsmParser::ParseDirectiveEndMacro(StringRef Directive,
                   "no current macro definition");
 }
 
+void GenericAsmParser::ParseUleb128(uint64_t Value) {
+  const uint64_t Mask = (1 << 7) - 1;
+  do {
+    unsigned Byte = Value & Mask;
+    Value >>= 7;
+    if (Value) // Not the last one
+      Byte |= (1 << 7);
+    getStreamer().EmitIntValue(Byte, 1, DEFAULT_ADDRSPACE);
+  } while (Value);
+}
+
+void GenericAsmParser::ParseSleb128(int64_t Value) {
+  const int64_t Mask = (1 << 7) - 1;
+  for(;;) {
+    unsigned Byte = Value & Mask;
+    Value >>= 7;
+    bool Done = ((Value ==  0 && (Byte & 0x40) == 0) ||
+                 (Value == -1 && (Byte & 0x40) != 0));
+    if (!Done)
+      Byte |= (1 << 7);
+    getStreamer().EmitIntValue(Byte, 1, DEFAULT_ADDRSPACE);
+    if (Done)
+      break;
+  }
+}
+
+bool GenericAsmParser::ParseDirectiveLEB128(StringRef DirName, SMLoc) {
+  int64_t Value;
+  if (getParser().ParseAbsoluteExpression(Value))
+    return true;
+
+  if (getLexer().isNot(AsmToken::EndOfStatement))
+    return TokError("unexpected token in directive");
+
+  if (DirName[1] == 's')
+    ParseSleb128(Value);
+  else
+    ParseUleb128(Value);
+  return false;
+}
+
+
 /// \brief Create an MCAsmParser instance.
 MCAsmParser *llvm::createMCAsmParser(const Target &T, SourceMgr &SM,
                                      MCContext &C, MCStreamer &Out,
diff --git a/lib/MC/MCParser/ELFAsmParser.cpp b/lib/MC/MCParser/ELFAsmParser.cpp
index f982fda..38288d7 100644
--- a/lib/MC/MCParser/ELFAsmParser.cpp
+++ b/lib/MC/MCParser/ELFAsmParser.cpp
@@ -48,8 +48,6 @@ public:
     AddDirectiveHandler<&ELFAsmParser::ParseSectionDirectiveEhFrame>(".eh_frame");
     AddDirectiveHandler<&ELFAsmParser::ParseDirectiveSection>(".section");
     AddDirectiveHandler<&ELFAsmParser::ParseDirectiveSize>(".size");
-    AddDirectiveHandler<&ELFAsmParser::ParseDirectiveLEB128>(".sleb128");
-    AddDirectiveHandler<&ELFAsmParser::ParseDirectiveLEB128>(".uleb128");
     AddDirectiveHandler<&ELFAsmParser::ParseDirectivePrevious>(".previous");
   }
 
@@ -109,7 +107,6 @@ public:
                               MCSectionELF::SHF_WRITE,
                               SectionKind::getDataRel());
   }
-  bool ParseDirectiveLEB128(StringRef, SMLoc);
   bool ParseDirectiveSection(StringRef, SMLoc);
   bool ParseDirectiveSize(StringRef, SMLoc);
   bool ParseDirectivePrevious(StringRef, SMLoc);
@@ -254,26 +251,6 @@ bool ELFAsmParser::ParseDirectiveSection(StringRef, SMLoc) {
   return false;
 }
 
-bool ELFAsmParser::ParseDirectiveLEB128(StringRef DirName, SMLoc) {
-  int64_t Value;
-  if (getParser().ParseAbsoluteExpression(Value))
-    return true;
-
-  if (getLexer().isNot(AsmToken::EndOfStatement))
-    return TokError("unexpected token in directive");
-
-  // FIXME: Add proper MC support.
-  if (getContext().getAsmInfo().hasLEB128()) {
-    if (DirName[1] == 's')
-      getStreamer().EmitRawText("\t.sleb128\t" + Twine(Value));
-    else
-      getStreamer().EmitRawText("\t.uleb128\t" + Twine(Value));
-    return false;
-  }
-  // FIXME: This shouldn't be an error!
-  return TokError("LEB128 not supported yet");
-}
-
 bool ELFAsmParser::ParseDirectivePrevious(StringRef DirName, SMLoc) {
   const MCSection *PreviousSection = getStreamer().getPreviousSection();
   if (PreviousSection != NULL)