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87d13166c7
This is how it should've been and brings it more in line with std::string_view. There should be no functional change here. This is mostly mechanical from a custom clang-tidy check, with a lot of manual fixups. It uncovers a lot of minor inefficiencies. This doesn't actually modify StringRef yet, I'll do that in a follow-up.
105 lines
3.1 KiB
C++
105 lines
3.1 KiB
C++
//===- StringToOffsetTable.h - Emit a big concatenated string ---*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TABLEGEN_STRINGTOOFFSETTABLE_H
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#define LLVM_TABLEGEN_STRINGTOOFFSETTABLE_H
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/ADT/StringMap.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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bool Empty() const { return StringOffset.empty(); }
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unsigned GetOrAddStringOffset(StringRef Str, bool appendZero = true) {
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auto IterBool =
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StringOffset.insert(std::make_pair(Str, AggregateString.size()));
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if (IterBool.second) {
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// Add the string to the aggregate if this is the first time found.
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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 IterBool.first->second;
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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 = std::string(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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/// Emit the string using character literals. MSVC has a limitation that
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/// string literals cannot be longer than 64K.
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void EmitCharArray(raw_ostream &O) {
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assert(AggregateString.find(')') == std::string::npos &&
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"can't emit raw string with closing parens");
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int Count = 0;
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O << ' ';
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for (char C : AggregateString) {
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O << " \'";
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O.write_escaped(StringRef(&C, 1));
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O << "\',";
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Count++;
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if (Count > 14) {
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O << "\n ";
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Count = 0;
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}
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}
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O << '\n';
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}
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};
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} // end namespace llvm
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#endif
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