[ADT] Make getAutoSenseRadix in StringRef global (#152503)

Needed in #152308

Author: kuilpd

llvm/include/llvm/ADT/StringRef.h

@@ -38,6 +38,8 @@ namespace llvm {
   LLVM_ABI bool getAsSignedInteger(StringRef Str, unsigned Radix,
                                    long long &Result);
 
+  LLVM_ABI unsigned getAutoSenseRadix(StringRef &Str);
+
   LLVM_ABI bool consumeUnsignedInteger(StringRef &Str, unsigned Radix,
                                        unsigned long long &Result);
   LLVM_ABI bool consumeSignedInteger(StringRef &Str, unsigned Radix,

llvm/lib/Support/StringRef.cpp

@@ -385,7 +385,7 @@ size_t StringRef::count(StringRef Str) const {
   return Count;
 }
 
-static unsigned GetAutoSenseRadix(StringRef &Str) {
+unsigned llvm::getAutoSenseRadix(StringRef &Str) {
   if (Str.empty())
     return 10;
 
@@ -410,7 +410,7 @@ bool llvm::consumeUnsignedInteger(StringRef &Str, unsigned Radix,
                                   unsigned long long &Result) {
   // Autosense radix if not specified.
   if (Radix == 0)
-    Radix = GetAutoSenseRadix(Str);
+    Radix = getAutoSenseRadix(Str);
 
   // Empty strings (after the radix autosense) are invalid.
   if (Str.empty()) return true;
@@ -509,7 +509,7 @@ bool StringRef::consumeInteger(unsigned Radix, APInt &Result) {
 
   // Autosense radix if not specified.
   if (Radix == 0)
-    Radix = GetAutoSenseRadix(Str);
+    Radix = getAutoSenseRadix(Str);
 
   assert(Radix > 1 && Radix <= 36);
 

llvm/unittests/ADT/StringRefTest.cpp

@@ -619,6 +619,19 @@ TEST(StringRefTest, Hashing) {
             hash_value(StringRef("hello world").slice(1, -1)));
 }
 
+TEST(StringRefTest, getAutoSenseRadix) {
+  struct RadixPair {
+    const char *Str;
+    unsigned Expected;
+  } RadixNumbers[] = {{"123", 10}, {"1", 10}, {"0b1", 2}, {"01", 8}, {"0o1", 8},
+                      {"0x1", 16}, {"0", 10}, {"00", 8},  {"", 10}};
+  for (size_t i = 0; i < std::size(RadixNumbers); ++i) {
+    StringRef number = RadixNumbers[i].Str;
+    unsigned radix = getAutoSenseRadix(number);
+    EXPECT_EQ(radix, RadixNumbers[i].Expected);
+  }
+}
+
 struct UnsignedPair {
   const char *Str;
   uint64_t Expected;