Revert r15266. This fixes llvm.org/pr15266.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175173 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 19 insertions, 40 deletions

diff --git a/lib/MC/MCParser/AsmLexer.cpp b/lib/MC/MCParser/AsmLexer.cpp
index 8fcc264d68..530e94e8d3 100644
--- a/lib/MC/MCParser/AsmLexer.cpp
+++ b/lib/MC/MCParser/AsmLexer.cpp
@@ -179,48 +179,26 @@ static unsigned doLookAhead(const char *&CurPtr, unsigned DefaultRadix) {
     }
   }
   bool isHex = *LookAhead == 'h' || *LookAhead == 'H';
-  bool isBinary = LookAhead[-1] == 'b' || LookAhead[-1] == 'B';
-  CurPtr = (isBinary || isHex || !FirstHex) ? LookAhead : FirstHex;
+  CurPtr = isHex || !FirstHex ? LookAhead : FirstHex;
   if (isHex)
     return 16;
-  if (isBinary) {
-    --CurPtr;
-    return 2;
-  }
   return DefaultRadix;
 }
 
 /// LexDigit: First character is [0-9].
 ///   Local Label: [0-9][:]
-///   Forward/Backward Label: [0-9]+f or [0-9]b
-///   Binary integer: 0b[01]+ or [01][bB]
+///   Forward/Backward Label: [0-9][fb]
+///   Binary integer: 0b[01]+
 ///   Octal integer: 0[0-7]+
 ///   Hex integer: 0x[0-9a-fA-F]+ or [0x]?[0-9][0-9a-fA-F]*[hH]
 ///   Decimal integer: [1-9][0-9]*
 AsmToken AsmLexer::LexDigit() {
-
-  // Backward Label: [0-9]b
-  if (*CurPtr == 'b') {
-    // See if we actually have "0b" as part of something like "jmp 0b\n"
-    if (!isdigit(CurPtr[1])) {
-      long long Value;
-      StringRef Result(TokStart, CurPtr - TokStart);
-      if (Result.getAsInteger(10, Value))
-        return ReturnError(TokStart, "invalid backward label");
-
-      return AsmToken(AsmToken::Integer, Result, Value);
-    }
-  }
-
-  // Binary integer: 1[01]*[bB]
   // Decimal integer: [1-9][0-9]*
-  // Hexidecimal integer: [1-9][0-9a-fA-F]*[hH]
   if (CurPtr[-1] != '0' || CurPtr[0] == '.') {
     unsigned Radix = doLookAhead(CurPtr, 10);
-    bool isDecimal = Radix == 10;
-
+    bool isHex = Radix == 16;
     // Check for floating point literals.
-    if (isDecimal && (*CurPtr == '.' || *CurPtr == 'e')) {
+    if (!isHex && (*CurPtr == '.' || *CurPtr == 'e')) {
       ++CurPtr;
       return LexFloatLiteral();
     }
@@ -233,7 +211,7 @@ AsmToken AsmLexer::LexDigit() {
       // integer, but that do fit in an unsigned one, we just convert them over.
       unsigned long long UValue;
       if (Result.getAsInteger(Radix, UValue))
-        return ReturnError(TokStart, isDecimal ? "invalid decimal number" :
+        return ReturnError(TokStart, !isHex ? "invalid decimal number" :
                            "invalid hexdecimal number");
       Value = (long long)UValue;
     }
@@ -249,9 +227,15 @@ AsmToken AsmLexer::LexDigit() {
     return AsmToken(AsmToken::Integer, Result, Value);
   }
 
-  // Binary integer: 0b[01]+
   if (*CurPtr == 'b') {
-    const char *NumStart = ++CurPtr;
+    ++CurPtr;
+    // See if we actually have "0b" as part of something like "jmp 0b\n"
+    if (!isdigit(CurPtr[0])) {
+      --CurPtr;
+      StringRef Result(TokStart, CurPtr - TokStart);
+      return AsmToken(AsmToken::Integer, Result, 0);
+    }
+    const char *NumStart = CurPtr;
     while (CurPtr[0] == '0' || CurPtr[0] == '1')
       ++CurPtr;
 
@@ -272,7 +256,6 @@ AsmToken AsmLexer::LexDigit() {
     return AsmToken(AsmToken::Integer, Result, Value);
   }
 
-  // Hex integer: 0x[0-9a-fA-F]+
   if (*CurPtr == 'x') {
     ++CurPtr;
     const char *NumStart = CurPtr;
@@ -299,21 +282,17 @@ AsmToken AsmLexer::LexDigit() {
                     (int64_t)Result);
   }
 
-  // Binary: 0[01]*[Bb], but not 0b.
-  // Octal: 0[0-7]*
-  // Hexidecimal: [0][0-9a-fA-F]*[hH]
+  // Either octal or hexidecimal.
   long long Value;
   unsigned Radix = doLookAhead(CurPtr, 8);
-  bool isBinary = Radix == 2;
-  bool isOctal = Radix == 8;
+  bool isHex = Radix == 16;
   StringRef Result(TokStart, CurPtr - TokStart);
   if (Result.getAsInteger(Radix, Value))
-    return ReturnError(TokStart, isOctal ? "invalid octal number" :
-                       isBinary ? "invalid binary number" :
+    return ReturnError(TokStart, !isHex ? "invalid octal number" :
                        "invalid hexdecimal number");
 
-  // Consume the [bB][hH].
-  if (Radix == 2 || Radix == 16)
+  // Consume the [hH].
+  if (Radix == 16)
     ++CurPtr;
 
   // The darwin/x86 (and x86-64) assembler accepts and ignores ULL and LL