commit 0c5da97dd08c948da0867a02f3305a18316027ad
author Reid Kleckner <reid@kleckner.net> Thu Jul 31 23:03:22 2014 +0000
committer Reid Kleckner <reid@kleckner.net> Thu Jul 31 23:03:22 2014 +0000
tree 0f79397b3ffa70abab17b0eea0f1c7a8b5334246
parent 09b8cdee128ad787670f6619eb45f70b16529b9e

X86 MC: Reject invalid segment registers before a memory operand colon

Previously we would execute unreachable during object emission.

llvm-svn: 214456

llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp

diff --git a/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp b/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
index c60bbb4..78b56b74 100644
--- a/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
+++ b/llvm/lib/Target/X86/AsmParser/X86AsmParser.cpp
@@ -1632,6 +1632,9 @@
     if (getLexer().isNot(AsmToken::Colon))
       return X86Operand::CreateReg(RegNo, Start, End);
 
+    if (!X86MCRegisterClasses[X86::SEGMENT_REGRegClassID].contains(RegNo))
+      return ErrorOperand(Start, "invalid segment register");
+
     getParser().Lex(); // Eat the colon.
     return ParseMemOperand(RegNo, Start);
   }