X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FADT%2FStringExtras.h;h=655d884e7baaab2677fb8debe622b0ae65fe7062;hb=cbeb8d9869aafec3c2c1ee0922f0a4d5bb4a916a;hp=20ba92a4aeb1a82092254546630c6d68fecea1f2;hpb=7ed47a13356daed2a34cd2209a31f92552e3bdd8;p=oota-llvm.git diff --git a/include/llvm/ADT/StringExtras.h b/include/llvm/ADT/StringExtras.h index 20ba92a4aeb..655d884e7ba 100644 --- a/include/llvm/ADT/StringExtras.h +++ b/include/llvm/ADT/StringExtras.h @@ -15,37 +15,52 @@ #define LLVM_ADT_STRINGEXTRAS_H #include "llvm/Support/DataTypes.h" -#include "llvm/ADT/APFloat.h" -#include -#include -#include -#include +#include "llvm/ADT/StringRef.h" namespace llvm { +template class SmallVectorImpl; -static inline std::string utohexstr(uint64_t X) { - char Buffer[40]; - char *BufPtr = Buffer+39; +/// hexdigit - Return the hexadecimal character for the +/// given number \arg X (which should be less than 16). +static inline char hexdigit(unsigned X, bool LowerCase = false) { + const char HexChar = LowerCase ? 'a' : 'A'; + return X < 10 ? '0' + X : HexChar + X - 10; +} - *BufPtr = 0; // Null terminate buffer... - if (X == 0) *--BufPtr = '0'; // Handle special case... +/// utohex_buffer - Emit the specified number into the buffer specified by +/// BufferEnd, returning a pointer to the start of the string. This can be used +/// like this: (note that the buffer must be large enough to handle any number): +/// char Buffer[40]; +/// printf("0x%s", utohex_buffer(X, Buffer+40)); +/// +/// This should only be used with unsigned types. +/// +template +static inline char *utohex_buffer(IntTy X, char *BufferEnd) { + char *BufPtr = BufferEnd; + *--BufPtr = 0; // Null terminate buffer. + if (X == 0) { + *--BufPtr = '0'; // Handle special case. + return BufPtr; + } while (X) { unsigned char Mod = static_cast(X) & 15; - if (Mod < 10) - *--BufPtr = '0' + Mod; - else - *--BufPtr = 'A' + Mod-10; + *--BufPtr = hexdigit(Mod); X >>= 4; } - return std::string(BufPtr); + return BufPtr; +} + +static inline std::string utohexstr(uint64_t X) { + char Buffer[17]; + return utohex_buffer(X, Buffer+17); } static inline std::string utostr_32(uint32_t X, bool isNeg = false) { - char Buffer[20]; - char *BufPtr = Buffer+19; + char Buffer[11]; + char *BufPtr = Buffer+11; - *BufPtr = 0; // Null terminate buffer... if (X == 0) *--BufPtr = '0'; // Handle special case... while (X) { @@ -55,26 +70,22 @@ static inline std::string utostr_32(uint32_t X, bool isNeg = false) { if (isNeg) *--BufPtr = '-'; // Add negative sign... - return std::string(BufPtr); + return std::string(BufPtr, Buffer+11); } static inline std::string utostr(uint64_t X, bool isNeg = false) { - if (X == uint32_t(X)) - return utostr_32(uint32_t(X), isNeg); - - char Buffer[40]; - char *BufPtr = Buffer+39; - - *BufPtr = 0; // Null terminate buffer... + char Buffer[21]; + char *BufPtr = Buffer+21; + if (X == 0) *--BufPtr = '0'; // Handle special case... - + while (X) { *--BufPtr = '0' + char(X % 10); X /= 10; } - + if (isNeg) *--BufPtr = '-'; // Add negative sign... - return std::string(BufPtr); + return std::string(BufPtr, Buffer+21); } @@ -85,82 +96,38 @@ static inline std::string itostr(int64_t X) { return utostr(static_cast(X)); } -static inline std::string ftostr(double V) { - char Buffer[200]; - sprintf(Buffer, "%20.6e", V); - char *B = Buffer; - while (*B == ' ') ++B; - return B; -} - -static inline std::string ftostr(const APFloat& V) { - if (&V.getSemantics() == &APFloat::IEEEdouble) - return ftostr(V.convertToDouble()); - else if (&V.getSemantics() == &APFloat::IEEEsingle) - return ftostr((double)V.convertToFloat()); - return 0; // error -} - -static inline std::string LowercaseString(const std::string &S) { - std::string result(S); - for (unsigned i = 0; i < S.length(); ++i) - if (isupper(result[i])) - result[i] = char(tolower(result[i])); - return result; -} - -static inline std::string UppercaseString(const std::string &S) { - std::string result(S); - for (unsigned i = 0; i < S.length(); ++i) - if (islower(result[i])) - result[i] = char(toupper(result[i])); - return result; -} - -/// StringsEqualNoCase - Return true if the two strings are equal, ignoring -/// case. -static inline bool StringsEqualNoCase(const std::string &LHS, - const std::string &RHS) { - if (LHS.size() != RHS.size()) return false; - for (unsigned i = 0, e = LHS.size(); i != e; ++i) - if (tolower(LHS[i]) != tolower(RHS[i])) return false; - return true; -} - -/// StringsEqualNoCase - Return true if the two strings are equal, ignoring -/// case. -static inline bool StringsEqualNoCase(const std::string &LHS, - const char *RHS) { - for (unsigned i = 0, e = LHS.size(); i != e; ++i) { - if (RHS[i] == 0) return false; // RHS too short. - if (tolower(LHS[i]) != tolower(RHS[i])) return false; - } - return RHS[LHS.size()] == 0; // Not too long? -} +/// StrInStrNoCase - Portable version of strcasestr. Locates the first +/// occurrence of string 's1' in string 's2', ignoring case. Returns +/// the offset of s2 in s1 or npos if s2 cannot be found. +StringRef::size_type StrInStrNoCase(StringRef s1, StringRef s2); /// getToken - This function extracts one token from source, ignoring any /// leading characters that appear in the Delimiters string, and ending the /// token at any of the characters that appear in the Delimiters string. If /// there are no tokens in the source string, an empty string is returned. -/// The Source source string is updated in place to remove the returned string -/// and any delimiter prefix from it. -std::string getToken(std::string &Source, - const char *Delimiters = " \t\n\v\f\r"); +/// The function returns a pair containing the extracted token and the +/// remaining tail string. +std::pair getToken(StringRef Source, + StringRef Delimiters = " \t\n\v\f\r"); /// SplitString - Split up the specified string according to the specified /// delimiters, appending the result fragments to the output list. -void SplitString(const std::string &Source, - std::vector &OutFragments, - const char *Delimiters = " \t\n\v\f\r"); - -/// UnescapeString - Modify the argument string, turning two character sequences -/// like '\\' 'n' into '\n'. This handles: \e \a \b \f \n \r \t \v \' \\ and -/// \num (where num is a 1-3 byte octal value). -void UnescapeString(std::string &Str); - -/// EscapeString - Modify the argument string, turning '\\' and anything that -/// doesn't satisfy std::isprint into an escape sequence. -void EscapeString(std::string &Str); +void SplitString(StringRef Source, + SmallVectorImpl &OutFragments, + StringRef Delimiters = " \t\n\v\f\r"); + +/// HashString - Hash function for strings. +/// +/// This is the Bernstein hash function. +// +// FIXME: Investigate whether a modified bernstein hash function performs +// better: http://eternallyconfuzzled.com/tuts/algorithms/jsw_tut_hashing.aspx +// X*33+c -> X*33^c +static inline unsigned HashString(StringRef Str, unsigned Result = 0) { + for (unsigned i = 0, e = Str.size(); i != e; ++i) + Result = Result * 33 + Str[i]; + return Result; +} } // End llvm namespace