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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@161657 91177308-0d34-0410-b5e6-96231b3b80d8
84 lines
2.5 KiB
C++
84 lines
2.5 KiB
C++
//===- StringToOffsetTable.h - Emit a big concatenated string ---*- 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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#ifndef TBLGEN_STRING_TO_OFFSET_TABLE_H
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#define TBLGEN_STRING_TO_OFFSET_TABLE_H
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/Support/raw_ostream.h"
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#include <cctype>
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namespace llvm {
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/// StringToOffsetTable - This class uniques a bunch of nul-terminated strings
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/// and keeps track of their offset in a massive contiguous string allocation.
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/// It can then output this string blob and use indexes into the string to
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/// reference each piece.
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class StringToOffsetTable {
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StringMap<unsigned> StringOffset;
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std::string AggregateString;
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public:
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unsigned GetOrAddStringOffset(StringRef Str, bool appendZero = true) {
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StringMapEntry<unsigned> &Entry = StringOffset.GetOrCreateValue(Str, -1U);
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if (Entry.getValue() == -1U) {
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// Add the string to the aggregate if this is the first time found.
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Entry.setValue(AggregateString.size());
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AggregateString.append(Str.begin(), Str.end());
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if (appendZero)
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AggregateString += '\0';
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}
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return Entry.getValue();
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}
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void EmitString(raw_ostream &O) {
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// Escape the string.
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SmallString<256> Str;
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raw_svector_ostream(Str).write_escaped(AggregateString);
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AggregateString = Str.str();
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O << " \"";
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unsigned CharsPrinted = 0;
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for (unsigned i = 0, e = AggregateString.size(); i != e; ++i) {
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if (CharsPrinted > 70) {
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O << "\"\n \"";
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CharsPrinted = 0;
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}
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O << AggregateString[i];
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++CharsPrinted;
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// Print escape sequences all together.
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if (AggregateString[i] != '\\')
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continue;
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assert(i+1 < AggregateString.size() && "Incomplete escape sequence!");
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if (isdigit(AggregateString[i+1])) {
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assert(isdigit(AggregateString[i+2]) &&
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isdigit(AggregateString[i+3]) &&
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"Expected 3 digit octal escape!");
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O << AggregateString[++i];
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O << AggregateString[++i];
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O << AggregateString[++i];
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CharsPrinted += 3;
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} else {
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O << AggregateString[++i];
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++CharsPrinted;
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}
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}
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O << "\"";
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}
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};
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} // end namespace llvm
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#endif
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