[llvm-size] Reject unknown radix values

This addresses https://bugs.llvm.org/show_bug.cgi?id=39403 by making
-radix an enumeration option with 8, 10, and 16 as the only accepted
values.

Reviewed by: jhenderson, MaskRay

Differential Revision: https://reviews.llvm.org/D53799

Patch by Eugene Sharygin

llvm-svn: 345588

Author: jh7370

llvm/tools/llvm-size/llvm-size.cpp

@@ -71,9 +71,11 @@ ArchFlags("arch", cl::desc("architecture(s) from a Mach-O file to dump"),
 static bool ArchAll = false;
 
 enum RadixTy { octal = 8, decimal = 10, hexadecimal = 16 };
-static cl::opt<unsigned int>
-Radix("radix", cl::desc("Print size in radix. Only 8, 10, and 16 are valid"),
-      cl::init(decimal));
+static cl::opt<RadixTy> Radix(
+    "radix", cl::desc("Print size in radix"), cl::init(decimal),
+    cl::values(clEnumValN(octal, "8", "Print size in octal"),
+               clEnumValN(decimal, "10", "Print size in decimal"),
+               clEnumValN(hexadecimal, "16", "Print size in hexadecimal")));
 
 static cl::opt<RadixTy>
 RadixShort(cl::desc("Print size in radix:"),
@@ -865,7 +867,7 @@ int main(int argc, char **argv) {
   if (OutputFormatShort.getNumOccurrences())
     OutputFormat = static_cast<OutputFormatTy>(OutputFormatShort);
   if (RadixShort.getNumOccurrences())
-    Radix = RadixShort;
+    Radix = RadixShort.getValue();
 
   for (unsigned i = 0; i < ArchFlags.size(); ++i) {
     if (ArchFlags[i] == "all") {