#ifndef LLVM_ADT_STRINGREF_H
#define LLVM_ADT_STRINGREF_H
+#include "llvm/Support/Compiler.h"
#include <algorithm>
#include <cassert>
#include <cstring>
// Workaround memcmp issue with null pointers (undefined behavior)
// by providing a specialized version
+ LLVM_ATTRIBUTE_ALWAYS_INLINE
static int compareMemory(const char *Lhs, const char *Rhs, size_t Length) {
if (Length == 0) { return 0; }
return ::memcmp(Lhs,Rhs,Length);
}
/// Construct a string ref from a pointer and length.
+ LLVM_ATTRIBUTE_ALWAYS_INLINE
/*implicit*/ StringRef(const char *data, size_t length)
: Data(data), Length(length) {
assert((data || length == 0) &&
}
/// Construct a string ref from an std::string.
+ LLVM_ATTRIBUTE_ALWAYS_INLINE
/*implicit*/ StringRef(const std::string &Str)
: Data(Str.data()), Length(Str.length()) {}
iterator end() const { return Data + Length; }
+ const unsigned char *bytes_begin() const {
+ return reinterpret_cast<const unsigned char *>(begin());
+ }
+ const unsigned char *bytes_end() const {
+ return reinterpret_cast<const unsigned char *>(end());
+ }
+
/// @}
/// @name String Operations
/// @{
/// data - Get a pointer to the start of the string (which may not be null
/// terminated).
+ LLVM_ATTRIBUTE_ALWAYS_INLINE
const char *data() const { return Data; }
/// empty - Check if the string is empty.
+ LLVM_ATTRIBUTE_ALWAYS_INLINE
bool empty() const { return Length == 0; }
/// size - Get the string size.
+ LLVM_ATTRIBUTE_ALWAYS_INLINE
size_t size() const { return Length; }
/// front - Get the first character in the string.
/// equals - Check for string equality, this is more efficient than
/// compare() when the relative ordering of inequal strings isn't needed.
+ LLVM_ATTRIBUTE_ALWAYS_INLINE
bool equals(StringRef RHS) const {
return (Length == RHS.Length &&
compareMemory(Data, RHS.Data, RHS.Length) == 0);
/// compare - Compare two strings; the result is -1, 0, or 1 if this string
/// is lexicographically less than, equal to, or greater than the \p RHS.
+ LLVM_ATTRIBUTE_ALWAYS_INLINE
int compare(StringRef RHS) const {
// Check the prefix for a mismatch.
if (int Res = compareMemory(Data, RHS.Data, std::min(Length, RHS.Length)))
/// @{
/// Check if this string starts with the given \p Prefix.
+ LLVM_ATTRIBUTE_ALWAYS_INLINE
bool startswith(StringRef Prefix) const {
return Length >= Prefix.Length &&
compareMemory(Data, Prefix.Data, Prefix.Length) == 0;
bool startswith_lower(StringRef Prefix) const;
/// Check if this string ends with the given \p Suffix.
+ LLVM_ATTRIBUTE_ALWAYS_INLINE
bool endswith(StringRef Suffix) const {
return Length >= Suffix.Length &&
compareMemory(end() - Suffix.Length, Suffix.Data, Suffix.Length) == 0;
///
/// \returns The index of the first occurrence of \p C, or npos if not
/// found.
+ LLVM_ATTRIBUTE_ALWAYS_INLINE
size_t find(char C, size_t From = 0) const {
- for (size_t i = std::min(From, Length), e = Length; i != e; ++i)
- if (Data[i] == C)
- return i;
+ size_t FindBegin = std::min(From, Length);
+ if (FindBegin < Length) { // Avoid calling memchr with nullptr.
+ // Just forward to memchr, which is faster than a hand-rolled loop.
+ if (const void *P = ::memchr(Data + FindBegin, C, Length - FindBegin))
+ return static_cast<const char *>(P) - Data;
+ }
return npos;
}
/// \param N The number of characters to included in the substring. If N
/// exceeds the number of characters remaining in the string, the string
/// suffix (starting with \p Start) will be returned.
+ LLVM_ATTRIBUTE_ALWAYS_INLINE
StringRef substr(size_t Start, size_t N = npos) const {
Start = std::min(Start, Length);
return StringRef(Data + Start, std::min(N, Length - Start));
/// Return a StringRef equal to 'this' but with the first \p N elements
/// dropped.
+ LLVM_ATTRIBUTE_ALWAYS_INLINE
StringRef drop_front(size_t N = 1) const {
assert(size() >= N && "Dropping more elements than exist");
return substr(N);
/// Return a StringRef equal to 'this' but with the last \p N elements
/// dropped.
+ LLVM_ATTRIBUTE_ALWAYS_INLINE
StringRef drop_back(size_t N = 1) const {
assert(size() >= N && "Dropping more elements than exist");
return substr(0, size()-N);
/// substring. If this is npos, or less than \p Start, or exceeds the
/// number of characters remaining in the string, the string suffix
/// (starting with \p Start) will be returned.
+ LLVM_ATTRIBUTE_ALWAYS_INLINE
StringRef slice(size_t Start, size_t End) const {
Start = std::min(Start, Length);
End = std::min(std::max(Start, End), Length);
/// Split into substrings around the occurrences of a separator string.
///
/// Each substring is stored in \p A. If \p MaxSplit is >= 0, at most
- /// \p MaxSplit splits are done and consequently <= \p MaxSplit
+ /// \p MaxSplit splits are done and consequently <= \p MaxSplit + 1
/// elements are added to A.
/// If \p KeepEmpty is false, empty strings are not added to \p A. They
/// still count when considering \p MaxSplit
StringRef Separator, int MaxSplit = -1,
bool KeepEmpty = true) const;
+ /// Split into substrings around the occurrences of a separator character.
+ ///
+ /// Each substring is stored in \p A. If \p MaxSplit is >= 0, at most
+ /// \p MaxSplit splits are done and consequently <= \p MaxSplit + 1
+ /// elements are added to A.
+ /// If \p KeepEmpty is false, empty strings are not added to \p A. They
+ /// still count when considering \p MaxSplit
+ /// An useful invariant is that
+ /// Separator.join(A) == *this if MaxSplit == -1 and KeepEmpty == true
+ ///
+ /// \param A - Where to put the substrings.
+ /// \param Separator - The string to split on.
+ /// \param MaxSplit - The maximum number of times the string is split.
+ /// \param KeepEmpty - True if empty substring should be added.
+ void split(SmallVectorImpl<StringRef> &A, char Separator, int MaxSplit = -1,
+ bool KeepEmpty = true) const;
+
/// Split into two substrings around the last occurrence of a separator
/// character.
///
/// @name StringRef Comparison Operators
/// @{
+ LLVM_ATTRIBUTE_ALWAYS_INLINE
inline bool operator==(StringRef LHS, StringRef RHS) {
return LHS.equals(RHS);
}
+ LLVM_ATTRIBUTE_ALWAYS_INLINE
inline bool operator!=(StringRef LHS, StringRef RHS) {
return !(LHS == RHS);
}
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