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llvm-mirror/lib/Support/Twine.cpp
Benjamin Kramer 5db856d384 Introduce Twine::toStringRef, a variant of toVector which avoids the copy if the
twine can be represented as a single StringRef. Use the new methode to simplify
some twine users.

llvm-svn: 93317
2010-01-13 12:45:23 +00:00

141 lines
3.8 KiB
C++

//===-- Twine.cpp - Fast Temporary String Concatenation -------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/Twine.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
std::string Twine::str() const {
SmallString<256> Vec;
return toStringRef(Vec).str();
}
void Twine::toVector(SmallVectorImpl<char> &Out) const {
raw_svector_ostream OS(Out);
print(OS);
}
StringRef Twine::toStringRef(SmallVectorImpl<char> &Out) const {
if (isSingleStringRef())
return getSingleStringRef();
toVector(Out);
return StringRef(Out.data(), Out.size());
}
void Twine::printOneChild(raw_ostream &OS, const void *Ptr,
NodeKind Kind) const {
switch (Kind) {
case Twine::NullKind: break;
case Twine::EmptyKind: break;
case Twine::TwineKind:
static_cast<const Twine*>(Ptr)->print(OS);
break;
case Twine::CStringKind:
OS << static_cast<const char*>(Ptr);
break;
case Twine::StdStringKind:
OS << *static_cast<const std::string*>(Ptr);
break;
case Twine::StringRefKind:
OS << *static_cast<const StringRef*>(Ptr);
break;
case Twine::DecUIKind:
OS << *static_cast<const unsigned int*>(Ptr);
break;
case Twine::DecIKind:
OS << *static_cast<const int*>(Ptr);
break;
case Twine::DecULKind:
OS << *static_cast<const unsigned long*>(Ptr);
break;
case Twine::DecLKind:
OS << *static_cast<const long*>(Ptr);
break;
case Twine::DecULLKind:
OS << *static_cast<const unsigned long long*>(Ptr);
break;
case Twine::DecLLKind:
OS << *static_cast<const long long*>(Ptr);
break;
case Twine::UHexKind:
OS.write_hex(*static_cast<const uint64_t*>(Ptr));
break;
}
}
void Twine::printOneChildRepr(raw_ostream &OS, const void *Ptr,
NodeKind Kind) const {
switch (Kind) {
case Twine::NullKind:
OS << "null"; break;
case Twine::EmptyKind:
OS << "empty"; break;
case Twine::TwineKind:
OS << "rope:";
static_cast<const Twine*>(Ptr)->printRepr(OS);
break;
case Twine::CStringKind:
OS << "cstring:\""
<< static_cast<const char*>(Ptr) << "\"";
break;
case Twine::StdStringKind:
OS << "std::string:\""
<< static_cast<const std::string*>(Ptr) << "\"";
break;
case Twine::StringRefKind:
OS << "stringref:\""
<< static_cast<const StringRef*>(Ptr) << "\"";
break;
case Twine::DecUIKind:
OS << "decUI:\"" << *static_cast<const unsigned int*>(Ptr) << "\"";
break;
case Twine::DecIKind:
OS << "decI:\"" << *static_cast<const int*>(Ptr) << "\"";
break;
case Twine::DecULKind:
OS << "decUL:\"" << *static_cast<const unsigned long*>(Ptr) << "\"";
break;
case Twine::DecLKind:
OS << "decL:\"" << *static_cast<const long*>(Ptr) << "\"";
break;
case Twine::DecULLKind:
OS << "decULL:\"" << *static_cast<const unsigned long long*>(Ptr) << "\"";
break;
case Twine::DecLLKind:
OS << "decLL:\"" << *static_cast<const long long*>(Ptr) << "\"";
break;
case Twine::UHexKind:
OS << "uhex:\"" << static_cast<const uint64_t*>(Ptr) << "\"";
break;
}
}
void Twine::print(raw_ostream &OS) const {
printOneChild(OS, LHS, getLHSKind());
printOneChild(OS, RHS, getRHSKind());
}
void Twine::printRepr(raw_ostream &OS) const {
OS << "(Twine ";
printOneChildRepr(OS, LHS, getLHSKind());
OS << " ";
printOneChildRepr(OS, RHS, getRHSKind());
OS << ")";
}
void Twine::dump() const {
print(llvm::dbgs());
}
void Twine::dumpRepr() const {
printRepr(llvm::dbgs());
}