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| author | Chris Lattner <sabre@nondot.org> | 2009-09-19 23:58:48 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2009-09-19 23:58:48 +0000 |
| commit | 63c6b7dc67f0061340c0701f3d5b1de142f58cec (patch) | |
| tree | c8155d0fa9d52866e8df1922ee0e0c96a35443b7 | |
| parent | 3670a01d0be3bab1aa5856fea02a854aee2b65d6 (diff) | |
| download | external_llvm-63c6b7dc67f0061340c0701f3d5b1de142f58cec.zip external_llvm-63c6b7dc67f0061340c0701f3d5b1de142f58cec.tar.gz external_llvm-63c6b7dc67f0061340c0701f3d5b1de142f58cec.tar.bz2 | |
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
| -rw-r--r-- | include/llvm/ADT/StringRef.h | 4 | ||||
| -rw-r--r-- | lib/Support/StringRef.cpp | 45 |
2 files changed, 48 insertions, 1 deletions
diff --git a/include/llvm/ADT/StringRef.h b/include/llvm/ADT/StringRef.h index 2015a66..01f5d7b 100644 --- a/include/llvm/ADT/StringRef.h +++ b/include/llvm/ADT/StringRef.h @@ -235,8 +235,10 @@ namespace llvm { /// this returns true to signify the error. The string is considered /// erroneous if empty. /// - //bool getAsInteger(unsigned Radix, long long &Result) const; + bool getAsInteger(unsigned Radix, long long &Result) const; bool getAsInteger(unsigned Radix, unsigned long long &Result) const; + bool getAsInteger(unsigned Radix, int &Result) const; + bool getAsInteger(unsigned Radix, unsigned &Result) const; // TODO: Provide overloads for int/unsigned that check for overflow. 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 @@ using namespace llvm; 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 @@ bool StringRef::getAsInteger(unsigned Radix, unsigned long long &Result) const { 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; +} |