add some more overloads of StringRef::getAsInteger for
common and useful integer types.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82338 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/StringRef.cpp b/lib/Support/StringRef.cpp
index 2e7d3c0..4c42701 100644
--- a/lib/Support/StringRef.cpp
+++ b/lib/Support/StringRef.cpp
@@ -12,6 +12,8 @@
const size_t StringRef::npos;
+/// GetAsUnsignedInteger - Workhorse method that converts a integer character
+/// sequence of radix up to 36 to an unsigned long long value.
static bool GetAsUnsignedInteger(StringRef Str, unsigned Radix,
unsigned long long &Result) {
// Autosense radix if not specified.
@@ -74,3 +76,46 @@
return GetAsUnsignedInteger(*this, Radix, Result);
}
+
+bool StringRef::getAsInteger(unsigned Radix, long long &Result) const {
+ unsigned long long ULLVal;
+
+ // Handle positive strings first.
+ if (empty() || front() != '-') {
+ if (GetAsUnsignedInteger(*this, Radix, ULLVal) ||
+ // Check for value so large it overflows a signed value.
+ (long long)ULLVal < 0)
+ return true;
+ Result = ULLVal;
+ return false;
+ }
+
+ // Get the positive part of the value.
+ if (GetAsUnsignedInteger(substr(1), Radix, ULLVal) ||
+ // Reject values so large they'd overflow as negative signed, but allow
+ // "-0". This negates the unsigned so that the negative isn't undefined
+ // on signed overflow.
+ (long long)-ULLVal > 0)
+ return true;
+
+ Result = -ULLVal;
+ return false;
+}
+
+bool StringRef::getAsInteger(unsigned Radix, int &Result) const {
+ long long Val;
+ if (getAsInteger(Radix, Val) ||
+ (int)Val != Val)
+ return true;
+ Result = Val;
+ return false;
+}
+
+bool StringRef::getAsInteger(unsigned Radix, unsigned &Result) const {
+ unsigned long long Val;
+ if (getAsInteger(Radix, Val) ||
+ (unsigned)Val != Val)
+ return true;
+ Result = Val;
+ return false;
+}