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Reuse constants for COFF string table entry offsets

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llvm-svn: 202130
This commit is contained in:
Nico Rieck 2014-02-25 09:50:40 +00:00
parent 11e572d7b0
commit dc7c008316
1 changed files with 9 additions and 7 deletions
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16
lib/MC/WinCOFFObjectWriter.cpp
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@ -468,11 +468,16 @@ void WinCOFFObjectWriter::DefineSymbol(MCSymbolData const &SymbolData,
}
}
// Maximum offsets for different string table entry encodings.
static const unsigned Max6DecimalOffset = 999999;
static const unsigned Max7DecimalOffset = 9999999;
static const uint64_t MaxBase64Offset = 0xFFFFFFFFFULL; // 64^6, including 0
// Encode a string table entry offset in base 64, padded to 6 chars, and
// prefixed with a double slash: '//AAAAAA', '//AAAAAB', ...
// Buffer must be at least 8 bytes large. No terminating null appended.
static void encodeBase64StringEntry(char* Buffer, uint64_t Value) {
assert(Value > 9999999 && Value <= 0xFFFFFFFFF &&
assert(Value > Max7DecimalOffset && Value <= MaxBase64Offset &&
"Illegal section name encoding for value");
static const char Alphabet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
@ -494,20 +499,17 @@ static void encodeBase64StringEntry(char* Buffer, uint64_t Value) {
/// name into the string table if needed
void WinCOFFObjectWriter::MakeSectionReal(COFFSection &S, size_t Number) {
if (S.Name.size() > COFF::NameSize) {
const unsigned Max6DecimalSize = 999999;
const unsigned Max7DecimalSize = 9999999;
const uint64_t MaxBase64Size = 0xFFFFFFFFF; // 64^6, including 0
uint64_t StringTableEntry = Strings.insert(S.Name.c_str());
if (StringTableEntry <= Max6DecimalSize) {
if (StringTableEntry <= Max6DecimalOffset) {
std::sprintf(S.Header.Name, "/%d", unsigned(StringTableEntry));
} else if (StringTableEntry <= Max7DecimalSize) {
} else if (StringTableEntry <= Max7DecimalOffset) {
// With seven digits, we have to skip the terminating null. Because
// sprintf always appends it, we use a larger temporary buffer.
char buffer[9] = { };
std::sprintf(buffer, "/%d", unsigned(StringTableEntry));
std::memcpy(S.Header.Name, buffer, 8);
} else if (StringTableEntry <= MaxBase64Size) {
} else if (StringTableEntry <= MaxBase64Offset) {
// Starting with 10,000,000, offsets are encoded as base64.
encodeBase64StringEntry(S.Header.Name, StringTableEntry);
} else {