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https://github.com/c64scene-ar/llvm-6502.git
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0123b7dcfa
tblgen will complain if a sign-extended constant does not fit into a data type smaller than i32, e.g., i16. This causes a problem when certain hex constants are used, such as 0xff for byte masks or immediate xor values. tblgen will try the sign-extended value first and, if the sign extended value would overflow, it tries to see if the unsigned value will fit. Consequently, a software developer can now safely incant: (XORHIr16 R16C:$rA, 0xffff) which is somewhat clearer and more informative than incanting: (XORHIr16 R16C:$rA, (i16 -1)) even if the two are bitwise equivalent. Tblgen also outputs the 64-bit unsigned constant in the generated ISel code when getTargetConstant() is invoked. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47188 91177308-0d34-0410-b5e6-96231b3b80d8
172 lines
5.2 KiB
C++
172 lines
5.2 KiB
C++
//===-- llvm/ADT/StringExtras.h - Useful string functions -------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file contains some functions that are useful when dealing with strings.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ADT_STRINGEXTRAS_H
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#define LLVM_ADT_STRINGEXTRAS_H
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#include "llvm/Support/DataTypes.h"
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#include "llvm/ADT/APFloat.h"
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#include <cctype>
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#include <cstdio>
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#include <string>
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#include <vector>
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namespace llvm {
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static inline std::string utohexstr(uint64_t X) {
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char Buffer[40];
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char *BufPtr = Buffer+39;
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*BufPtr = 0; // Null terminate buffer...
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if (X == 0) *--BufPtr = '0'; // Handle special case...
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while (X) {
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unsigned char Mod = static_cast<unsigned char>(X) & 15;
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if (Mod < 10)
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*--BufPtr = '0' + Mod;
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else
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*--BufPtr = 'A' + Mod-10;
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X >>= 4;
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}
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return std::string(BufPtr);
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}
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static inline std::string utostr_32(uint32_t X, bool isNeg = false) {
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char Buffer[20];
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char *BufPtr = Buffer+19;
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*BufPtr = 0; // Null terminate buffer...
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if (X == 0) *--BufPtr = '0'; // Handle special case...
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while (X) {
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*--BufPtr = '0' + char(X % 10);
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X /= 10;
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}
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if (isNeg) *--BufPtr = '-'; // Add negative sign...
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return std::string(BufPtr);
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}
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static inline std::string utostr(uint64_t X, bool isNeg = false) {
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if (X == uint32_t(X))
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return utostr_32(uint32_t(X), isNeg);
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char Buffer[40];
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char *BufPtr = Buffer+39;
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*BufPtr = 0; // Null terminate buffer...
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if (X == 0) *--BufPtr = '0'; // Handle special case...
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while (X) {
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*--BufPtr = '0' + char(X % 10);
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X /= 10;
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}
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if (isNeg) *--BufPtr = '-'; // Add negative sign...
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return std::string(BufPtr);
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}
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static inline std::string itostr(int64_t X) {
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if (X < 0)
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return utostr(static_cast<uint64_t>(-X), true);
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else
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return utostr(static_cast<uint64_t>(X));
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}
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static inline std::string itohexstr(int64_t X) {
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return utohexstr(static_cast<uint64_t>(X));
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}
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static inline std::string ftostr(double V) {
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char Buffer[200];
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sprintf(Buffer, "%20.6e", V);
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char *B = Buffer;
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while (*B == ' ') ++B;
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return B;
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}
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static inline std::string ftostr(const APFloat& V) {
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if (&V.getSemantics() == &APFloat::IEEEdouble)
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return ftostr(V.convertToDouble());
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else if (&V.getSemantics() == &APFloat::IEEEsingle)
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return ftostr((double)V.convertToFloat());
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return "<unknown format in ftostr>"; // error
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}
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static inline std::string LowercaseString(const std::string &S) {
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std::string result(S);
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for (unsigned i = 0; i < S.length(); ++i)
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if (isupper(result[i]))
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result[i] = char(tolower(result[i]));
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return result;
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}
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static inline std::string UppercaseString(const std::string &S) {
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std::string result(S);
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for (unsigned i = 0; i < S.length(); ++i)
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if (islower(result[i]))
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result[i] = char(toupper(result[i]));
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return result;
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}
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/// StringsEqualNoCase - Return true if the two strings are equal, ignoring
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/// case.
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static inline bool StringsEqualNoCase(const std::string &LHS,
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const std::string &RHS) {
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if (LHS.size() != RHS.size()) return false;
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for (unsigned i = 0, e = LHS.size(); i != e; ++i)
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if (tolower(LHS[i]) != tolower(RHS[i])) return false;
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return true;
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}
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/// StringsEqualNoCase - Return true if the two strings are equal, ignoring
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/// case.
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static inline bool StringsEqualNoCase(const std::string &LHS,
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const char *RHS) {
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for (unsigned i = 0, e = LHS.size(); i != e; ++i) {
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if (RHS[i] == 0) return false; // RHS too short.
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if (tolower(LHS[i]) != tolower(RHS[i])) return false;
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}
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return RHS[LHS.size()] == 0; // Not too long?
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}
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/// getToken - This function extracts one token from source, ignoring any
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/// leading characters that appear in the Delimiters string, and ending the
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/// token at any of the characters that appear in the Delimiters string. If
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/// there are no tokens in the source string, an empty string is returned.
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/// The Source source string is updated in place to remove the returned string
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/// and any delimiter prefix from it.
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std::string getToken(std::string &Source,
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const char *Delimiters = " \t\n\v\f\r");
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/// SplitString - Split up the specified string according to the specified
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/// delimiters, appending the result fragments to the output list.
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void SplitString(const std::string &Source,
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std::vector<std::string> &OutFragments,
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const char *Delimiters = " \t\n\v\f\r");
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/// UnescapeString - Modify the argument string, turning two character sequences
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/// like '\\' 'n' into '\n'. This handles: \e \a \b \f \n \r \t \v \' \\ and
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/// \num (where num is a 1-3 byte octal value).
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void UnescapeString(std::string &Str);
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/// EscapeString - Modify the argument string, turning '\\' and anything that
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/// doesn't satisfy std::isprint into an escape sequence.
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void EscapeString(std::string &Str);
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} // End llvm namespace
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#endif
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