switch c {
	case '*', '#', '$', '@', '!', '?', '-', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9':
		return true
	}
	return false
}

// isAlphaNum reports whether the byte is an ASCII letter, number, or underscore.
func isAlphaNum(c uint8) bool {
	return c == '_' || '0' <= c && c <= '9' || 'a' <= c && c <= 'z' || 'A' <= c && c <= 'Z'
}

)

// isAlpha returns true if the byte is not a digit.
// b must be an ASCII letter or digit.
func isAlpha(b byte) bool {
	return b > '9'
}

// isAlphaNum returns true if the string contains only ASCII letters or digits.
func isAlphaNum(s []byte) bool {
	for _, c := range s {
		if !('a' <= c && c <= 'z' || 'A' <= c && c <= 'Z' || '0' <= c && c <= '9') {
			return false
		}
	}
	return true
}

namespace tensorflow {
namespace tfcompile {

namespace {

using BufferInfo = xla::cpu_function_runtime::BufferInfo;

bool IsAlpha(char c) {
  return (c >= 'A' && c <= 'Z') || (c >= 'a' && c <= 'z');
}

bool IsAlphaNum(char c) { return IsAlpha(c) || (c >= '0' && c <= '9'); }

// Convert an XLA type into a C++ type.
Status XLATypeToCpp(xla::PrimitiveType type, string* str) {
  switch (type) {
    case xla::PRED:
      *str = "bool";