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[TableGen] Fix line wrapping logic for the autogenerated header to use math that makes more sense (at least to me).

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The old code had a bug if the description was between 75 and 85 characters or so as it substracted PSLen from Desc.size() instead of MAX_LINE_LEN in the compare. It also calculated odd values for PosE on the last split and just let StringRef::slice take care of it being larger than the description string.

llvm-svn: 238187
This commit is contained in:
Craig Topper 2015-05-26 08:07:56 +00:00
parent f2dd173b6e
commit d7a132b310
1 changed files with 6 additions and 7 deletions
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13
lib/TableGen/TableGenBackend.cpp
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@ -36,14 +36,13 @@ void llvm::emitSourceFileHeader(StringRef Desc, raw_ostream &OS) {
StringRef Prefix("|* ");
StringRef Suffix(" *|");
printLine(OS, Prefix, ' ', Suffix);
size_t PSLen = Prefix.size() + Suffix.size();
assert(PSLen < MAX_LINE_LEN);
size_t Pos = 0U;
do{
size_t PSLen = Suffix.size() + Prefix.size();
size_t PosE = Pos + ((MAX_LINE_LEN > (Desc.size() - PSLen)) ?
Desc.size() :
MAX_LINE_LEN - PSLen);
printLine(OS, Prefix + Desc.slice(Pos, PosE), ' ', Suffix);
Pos = PosE;
do {
size_t Length = std::min(Desc.size() - Pos, MAX_LINE_LEN - PSLen);
printLine(OS, Prefix + Desc.substr(Pos, Length), ' ', Suffix);
Pos += Length;
} while (Pos < Desc.size());
printLine(OS, Prefix, ' ', Suffix);
printLine(OS, Prefix + "Automatically generated file, do not edit!", ' ',