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A bugfix for tblgen, in the function ‘emitSourceFileHeader’. 

When the first parameter (‘Desc’) is more than 80 characters long, it will result the header line that contains the description to be more
Than (4GB!) long. Not only it takes forever to produce, the output file cannot be open, since its ginormous.

Patch by Elior Malul.

llvm-svn: 173672
This commit is contained in:
Nadav Rotem 2013-01-28 07:35:33 +00:00
parent 6c17547ef1
commit f0705254d1
1 changed files with 25 additions and 6 deletions
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31
llvm/lib/TableGen/TableGenBackend.cpp
View File

@ -14,13 +14,20 @@
#include "llvm/ADT/Twine.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/TableGen/TableGenBackend.h"
#include <algorithm>
using namespace llvm;
const size_t MAX_LINE_LEN = 80U;
static void printLine(raw_ostream &OS, const Twine &Prefix, char Fill,
StringRef Suffix) {
uint64_t Pos = OS.tell();
size_t Pos = (size_t)OS.tell();
assert((MAX_LINE_LEN - Prefix.str().size() - Suffix.size() > 0) &&
"header line exceeds max limit");
OS << Prefix;
for (unsigned i = OS.tell() - Pos, e = 80 - Suffix.size(); i != e; ++i)
const size_t e = MAX_LINE_LEN - Suffix.size();
for (size_t i = (size_t)OS.tell() - Pos; i < e; ++i)
OS << Fill;
OS << Suffix << '\n';
}
@ -28,10 +35,22 @@ static void printLine(raw_ostream &OS, const Twine &Prefix, char Fill,
void llvm::emitSourceFileHeader(StringRef Desc, raw_ostream &OS) {
printLine(OS, "/*===- TableGen'erated file ", '-', "*- C++ -*-===*\\");
printLine(OS, "|*", ' ', "*|");
printLine(OS, "|* " + Desc, ' ', "*|");
printLine(OS, "|*", ' ', "*|");
printLine(OS, "|* Automatically generated file, do not edit!", ' ', "*|");
printLine(OS, "|*", ' ', "*|");
size_t Pos = 0U;
size_t PosE;
StringRef Prefix("|*");
StringRef Suffix(" *|");
do{
size_t PSLen = Suffix.size() + Prefix.size();
PosE = Pos + ((MAX_LINE_LEN > (Desc.size() - PSLen)) ?
Desc.size() :
MAX_LINE_LEN - PSLen);
printLine(OS, Prefix + Desc.slice(Pos, PosE), ' ', Suffix);
Pos = PosE;
} while(Pos < Desc.size());
printLine(OS, Prefix, ' ', Suffix);
printLine(OS, Prefix + " Automatically generated file, do not edit!", ' ',
Suffix);
printLine(OS, Prefix, ' ', Suffix);
printLine(OS, "\\*===", '-', "===*/");
OS << '\n';
}