1 //===- StringToOffsetTable.h - Emit a big concatenated string ---*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef TBLGEN_STRING_TO_OFFSET_TABLE_H
11 #define TBLGEN_STRING_TO_OFFSET_TABLE_H
13 #include "llvm/ADT/StringMap.h"
14 #include "llvm/Support/raw_ostream.h"
15 #include "llvm/ADT/StringExtras.h"
19 /// StringToOffsetTable - This class uniques a bunch of nul-terminated strings
20 /// and keeps track of their offset in a massive contiguous string allocation.
21 /// It can then output this string blob and use indexes into the string to
22 /// reference each piece.
23 class StringToOffsetTable {
24 StringMap<unsigned> StringOffset;
25 std::string AggregateString;
28 unsigned GetOrAddStringOffset(StringRef Str) {
29 unsigned &Entry = StringOffset[Str];
31 // Add the string to the aggregate if this is the first time found.
32 Entry = AggregateString.size();
33 AggregateString.append(Str.begin(), Str.end());
34 AggregateString += '\0';
40 void EmitString(raw_ostream &O) {
42 unsigned CharsPrinted = 0;
43 EscapeString(AggregateString);
44 for (unsigned i = 0, e = AggregateString.size(); i != e; ++i) {
45 if (CharsPrinted > 70) {
49 O << AggregateString[i];
52 // Print escape sequences all together.
53 if (AggregateString[i] != '\\')
56 assert(i+1 < AggregateString.size() && "Incomplete escape sequence!");
57 if (isdigit(AggregateString[i+1])) {
58 assert(isdigit(AggregateString[i+2]) &&
59 isdigit(AggregateString[i+3]) &&
60 "Expected 3 digit octal escape!");
61 O << AggregateString[++i];
62 O << AggregateString[++i];
63 O << AggregateString[++i];
66 O << AggregateString[++i];
74 } // end namespace llvm