mirror of
https://github.com/RPCS3/llvm.git
synced 2024-12-27 06:35:30 +00:00
7fcd5f8c89
This is a follow-up to r207670 (ELF) and r218636 (COFF). Differential Revision: http://reviews.llvm.org/D5622 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219126 91177308-0d34-0410-b5e6-96231b3b80d8
89 lines
2.3 KiB
C++
89 lines
2.3 KiB
C++
//===-- StringTableBuilder.cpp - String table building utility ------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/MC/StringTableBuilder.h"
|
|
#include "llvm/ADT/SmallVector.h"
|
|
#include "llvm/Support/COFF.h"
|
|
#include "llvm/Support/Endian.h"
|
|
|
|
using namespace llvm;
|
|
|
|
static bool compareBySuffix(StringRef a, StringRef b) {
|
|
size_t sizeA = a.size();
|
|
size_t sizeB = b.size();
|
|
size_t len = std::min(sizeA, sizeB);
|
|
for (size_t i = 0; i < len; ++i) {
|
|
char ca = a[sizeA - i - 1];
|
|
char cb = b[sizeB - i - 1];
|
|
if (ca != cb)
|
|
return ca > cb;
|
|
}
|
|
return sizeA > sizeB;
|
|
}
|
|
|
|
void StringTableBuilder::finalize(Kind kind) {
|
|
SmallVector<StringRef, 8> Strings;
|
|
Strings.reserve(StringIndexMap.size());
|
|
|
|
for (auto i = StringIndexMap.begin(), e = StringIndexMap.end(); i != e; ++i)
|
|
Strings.push_back(i->getKey());
|
|
|
|
std::sort(Strings.begin(), Strings.end(), compareBySuffix);
|
|
|
|
switch (kind) {
|
|
case ELF:
|
|
case MachO:
|
|
// Start the table with a NUL byte.
|
|
StringTable += '\x00';
|
|
break;
|
|
case WinCOFF:
|
|
// Make room to write the table size later.
|
|
StringTable.append(4, '\x00');
|
|
break;
|
|
}
|
|
|
|
StringRef Previous;
|
|
for (StringRef s : Strings) {
|
|
if (kind == WinCOFF)
|
|
assert(s.size() > COFF::NameSize && "Short string in COFF string table!");
|
|
|
|
if (Previous.endswith(s)) {
|
|
StringIndexMap[s] = StringTable.size() - 1 - s.size();
|
|
continue;
|
|
}
|
|
|
|
StringIndexMap[s] = StringTable.size();
|
|
StringTable += s;
|
|
StringTable += '\x00';
|
|
Previous = s;
|
|
}
|
|
|
|
switch (kind) {
|
|
case ELF:
|
|
break;
|
|
case MachO:
|
|
// Pad to multiple of 4.
|
|
while (StringTable.size() % 4)
|
|
StringTable += '\x00';
|
|
break;
|
|
case WinCOFF:
|
|
// Write the table size in the first word.
|
|
assert(StringTable.size() <= std::numeric_limits<uint32_t>::max());
|
|
uint32_t size = static_cast<uint32_t>(StringTable.size());
|
|
support::endian::write<uint32_t, support::little, support::unaligned>(
|
|
StringTable.data(), size);
|
|
break;
|
|
}
|
|
}
|
|
|
|
void StringTableBuilder::clear() {
|
|
StringTable.clear();
|
|
StringIndexMap.clear();
|
|
}
|