[TableGen] Fix wrong lex result on 64-bit integer boundaries

Binary and decimal values were reconginzed by strtoll, which returns
error when the msb is 1, and the error was ignored, resulting to wrong
results.

This patch fixes the issue.

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D157079

1 files changed, 46 insertions, 40 deletions

diff --git a/llvm/lib/TableGen/TGLexer.cpp b/llvm/lib/TableGen/TGLexer.cpp
index 98f0e8c..484f840 100644
--- a/llvm/lib/TableGen/TGLexer.cpp
+++ b/llvm/lib/TableGen/TGLexer.cpp
@@ -462,56 +462,62 @@ bool TGLexer::SkipCComment() {
 ///    0x[0-9a-fA-F]+
 ///    0b[01]+
 tgtok::TokKind TGLexer::LexNumber() {
+  unsigned Base = 0;
+  const char *NumStart;
+
+  // Check if it's a hex or a binary value.
   if (CurPtr[-1] == '0') {
+    NumStart = CurPtr + 1;
     if (CurPtr[0] == 'x') {
-      ++CurPtr;
-      const char *NumStart = CurPtr;
-      while (isxdigit(CurPtr[0]))
+      Base = 16;
+      do
         ++CurPtr;
-
-      // Requires at least one hex digit.
-      if (CurPtr == NumStart)
-        return ReturnError(TokStart, "Invalid hexadecimal number");
-
-      errno = 0;
-      CurIntVal = strtoll(NumStart, nullptr, 16);
-      if (errno == EINVAL)
-        return ReturnError(TokStart, "Invalid hexadecimal number");
-      if (errno == ERANGE) {
-        errno = 0;
-        CurIntVal = (int64_t)strtoull(NumStart, nullptr, 16);
-        if (errno == EINVAL)
-          return ReturnError(TokStart, "Invalid hexadecimal number");
-        if (errno == ERANGE)
-          return ReturnError(TokStart, "Hexadecimal number out of range");
-      }
-      return tgtok::IntVal;
+      while (isxdigit(CurPtr[0]));
     } else if (CurPtr[0] == 'b') {
-      ++CurPtr;
-      const char *NumStart = CurPtr;
-      while (CurPtr[0] == '0' || CurPtr[0] == '1')
+      Base = 2;
+      do
         ++CurPtr;
-
-      // Requires at least one binary digit.
-      if (CurPtr == NumStart)
-        return ReturnError(CurPtr-2, "Invalid binary number");
-      CurIntVal = strtoll(NumStart, nullptr, 2);
-      return tgtok::BinaryIntVal;
+      while (CurPtr[0] == '0' || CurPtr[0] == '1');
     }
   }
 
-  // Check for a sign without a digit.
-  if (!isdigit(CurPtr[0])) {
-    if (CurPtr[-1] == '-')
-      return tgtok::minus;
-    else if (CurPtr[-1] == '+')
-      return tgtok::plus;
+  // For a hex or binary value, we always convert it to an unsigned value.
+  bool IsMinus = false;
+
+  // Check if it's a decimal value.
+  if (Base == 0) {
+    // Check for a sign without a digit.
+    if (!isdigit(CurPtr[0])) {
+      if (CurPtr[-1] == '-')
+        return tgtok::minus;
+      else if (CurPtr[-1] == '+')
+        return tgtok::plus;
+    }
+
+    Base = 10;
+    NumStart = TokStart;
+    IsMinus = CurPtr[-1] == '-';
+
+    while (isdigit(CurPtr[0]))
+      ++CurPtr;
   }
 
-  while (isdigit(CurPtr[0]))
-    ++CurPtr;
-  CurIntVal = strtoll(TokStart, nullptr, 10);
-  return tgtok::IntVal;
+  // Requires at least one digit.
+  if (CurPtr == NumStart)
+    return ReturnError(TokStart, "Invalid number");
+
+  errno = 0;
+  if (IsMinus)
+    CurIntVal = strtoll(NumStart, nullptr, Base);
+  else
+    CurIntVal = strtoull(NumStart, nullptr, Base);
+
+  if (errno == EINVAL)
+    return ReturnError(TokStart, "Invalid number");
+  if (errno == ERANGE)
+    return ReturnError(TokStart, "Number out of range");
+
+  return Base == 2 ? tgtok::BinaryIntVal : tgtok::IntVal;
 }
 
 /// LexBracket - We just read '['.  If this is a code block, return it,