LLVM  6.0.0svn
Twine.cpp
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1 //===-- Twine.cpp - Fast Temporary String Concatenation -------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "llvm/ADT/Twine.h"
11 #include "llvm/ADT/SmallString.h"
12 #include "llvm/Support/Debug.h"
15 using namespace llvm;
16 
17 std::string Twine::str() const {
18  // If we're storing only a std::string, just return it.
19  if (LHSKind == StdStringKind && RHSKind == EmptyKind)
20  return *LHS.stdString;
21 
22  // If we're storing a formatv_object, we can avoid an extra copy by formatting
23  // it immediately and returning the result.
24  if (LHSKind == FormatvObjectKind && RHSKind == EmptyKind)
25  return LHS.formatvObject->str();
26 
27  // Otherwise, flatten and copy the contents first.
28  SmallString<256> Vec;
29  return toStringRef(Vec).str();
30 }
31 
33  raw_svector_ostream OS(Out);
34  print(OS);
35 }
36 
38  if (isUnary()) {
39  switch (getLHSKind()) {
40  case CStringKind:
41  // Already null terminated, yay!
42  return StringRef(LHS.cString);
43  case StdStringKind: {
44  const std::string *str = LHS.stdString;
45  return StringRef(str->c_str(), str->size());
46  }
47  default:
48  break;
49  }
50  }
51  toVector(Out);
52  Out.push_back(0);
53  Out.pop_back();
54  return StringRef(Out.data(), Out.size());
55 }
56 
57 void Twine::printOneChild(raw_ostream &OS, Child Ptr,
58  NodeKind Kind) const {
59  switch (Kind) {
60  case Twine::NullKind: break;
61  case Twine::EmptyKind: break;
62  case Twine::TwineKind:
63  Ptr.twine->print(OS);
64  break;
65  case Twine::CStringKind:
66  OS << Ptr.cString;
67  break;
68  case Twine::StdStringKind:
69  OS << *Ptr.stdString;
70  break;
71  case Twine::StringRefKind:
72  OS << *Ptr.stringRef;
73  break;
74  case Twine::SmallStringKind:
75  OS << *Ptr.smallString;
76  break;
77  case Twine::FormatvObjectKind:
78  OS << *Ptr.formatvObject;
79  break;
80  case Twine::CharKind:
81  OS << Ptr.character;
82  break;
83  case Twine::DecUIKind:
84  OS << Ptr.decUI;
85  break;
86  case Twine::DecIKind:
87  OS << Ptr.decI;
88  break;
89  case Twine::DecULKind:
90  OS << *Ptr.decUL;
91  break;
92  case Twine::DecLKind:
93  OS << *Ptr.decL;
94  break;
95  case Twine::DecULLKind:
96  OS << *Ptr.decULL;
97  break;
98  case Twine::DecLLKind:
99  OS << *Ptr.decLL;
100  break;
101  case Twine::UHexKind:
102  OS.write_hex(*Ptr.uHex);
103  break;
104  }
105 }
106 
107 void Twine::printOneChildRepr(raw_ostream &OS, Child Ptr,
108  NodeKind Kind) const {
109  switch (Kind) {
110  case Twine::NullKind:
111  OS << "null"; break;
112  case Twine::EmptyKind:
113  OS << "empty"; break;
114  case Twine::TwineKind:
115  OS << "rope:";
116  Ptr.twine->printRepr(OS);
117  break;
118  case Twine::CStringKind:
119  OS << "cstring:\""
120  << Ptr.cString << "\"";
121  break;
122  case Twine::StdStringKind:
123  OS << "std::string:\""
124  << Ptr.stdString << "\"";
125  break;
126  case Twine::StringRefKind:
127  OS << "stringref:\""
128  << Ptr.stringRef << "\"";
129  break;
130  case Twine::SmallStringKind:
131  OS << "smallstring:\"" << *Ptr.smallString << "\"";
132  break;
133  case Twine::FormatvObjectKind:
134  OS << "formatv:\"" << *Ptr.formatvObject << "\"";
135  break;
136  case Twine::CharKind:
137  OS << "char:\"" << Ptr.character << "\"";
138  break;
139  case Twine::DecUIKind:
140  OS << "decUI:\"" << Ptr.decUI << "\"";
141  break;
142  case Twine::DecIKind:
143  OS << "decI:\"" << Ptr.decI << "\"";
144  break;
145  case Twine::DecULKind:
146  OS << "decUL:\"" << *Ptr.decUL << "\"";
147  break;
148  case Twine::DecLKind:
149  OS << "decL:\"" << *Ptr.decL << "\"";
150  break;
151  case Twine::DecULLKind:
152  OS << "decULL:\"" << *Ptr.decULL << "\"";
153  break;
154  case Twine::DecLLKind:
155  OS << "decLL:\"" << *Ptr.decLL << "\"";
156  break;
157  case Twine::UHexKind:
158  OS << "uhex:\"" << Ptr.uHex << "\"";
159  break;
160  }
161 }
162 
163 void Twine::print(raw_ostream &OS) const {
164  printOneChild(OS, LHS, getLHSKind());
165  printOneChild(OS, RHS, getRHSKind());
166 }
167 
168 void Twine::printRepr(raw_ostream &OS) const {
169  OS << "(Twine ";
170  printOneChildRepr(OS, LHS, getLHSKind());
171  OS << " ";
172  printOneChildRepr(OS, RHS, getRHSKind());
173  OS << ")";
174 }
175 
176 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
178  print(dbgs());
179 }
180 
182  printRepr(dbgs());
183 }
184 #endif
void push_back(const T &Elt)
Definition: SmallVector.h:212
LLVM_NODISCARD std::string str() const
str - Get the contents as an std::string.
Definition: StringRef.h:228
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
#define LLVM_DUMP_METHOD
Mark debug helper function definitions like dump() that should not be stripped from debug builds...
Definition: Compiler.h:449
LLVM_ATTRIBUTE_ALWAYS_INLINE size_type size() const
Definition: SmallVector.h:136
StringRef toStringRef(SmallVectorImpl< char > &Out) const
This returns the twine as a single StringRef if it can be represented as such.
Definition: Twine.h:463
A raw_ostream that writes to an SmallVector or SmallString.
Definition: raw_ostream.h:493
void dumpRepr() const
Dump the representation of this twine to stderr.
Definition: Twine.cpp:181
void dump() const
Dump the concatenated string represented by this twine to stderr.
Definition: Twine.cpp:177
raw_ostream & write_hex(unsigned long long N)
Output N in hexadecimal, without any prefix or padding.
StringRef toNullTerminatedStringRef(SmallVectorImpl< char > &Out) const
This returns the twine as a single null terminated StringRef if it can be represented as such...
Definition: Twine.cpp:37
void toVector(SmallVectorImpl< char > &Out) const
Append the concatenated string into the given SmallString or SmallVector.
Definition: Twine.cpp:32
raw_ostream & dbgs()
dbgs() - This returns a reference to a raw_ostream for debugging messages.
Definition: Debug.cpp:132
pointer data()
Return a pointer to the vector&#39;s buffer, even if empty().
Definition: SmallVector.h:143
std::string str() const
Return the twine contents as a std::string.
Definition: Twine.cpp:17
const unsigned Kind
void printRepr(raw_ostream &OS) const
Write the representation of this twine to the stream OS.
Definition: Twine.cpp:168
This class implements an extremely fast bulk output stream that can only output to a stream...
Definition: raw_ostream.h:44
StringRef - Represent a constant reference to a string, i.e.
Definition: StringRef.h:49
void print(raw_ostream &OS) const
Write the concatenated string represented by this twine to the stream OS.
Definition: Twine.cpp:163