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add some more overloads of StringRef::getAsInteger for

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common and useful integer types.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82338 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-09-19 23:58:48 +00:00
parent 3670a01d0b
commit 63c6b7dc67
2 changed files with 48 additions and 1 deletions
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4
include/llvm/ADT/StringRef.h
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@ -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.

45
lib/Support/StringRef.cpp
View File

@ -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;
}