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[Graph Writer] Limit the length of the graph name because Windows can't handle it.

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Windows can't handle paths longer than 260 code points without \\?\. Even
with \\?\ it can't handle path components longer than 255 code points. So
limit graph names to the arbitrary length of 140. Random characters are still
added to the end, so it's ok if graph names collide.

Differential Revision: http://reviews.llvm.org/D3883

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209483 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael J. Spencer 2014-05-22 23:32:18 +00:00
parent ef518f1cbb
commit c86ebbd01e
1 changed files with 4 additions and 1 deletions
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5
include/llvm/Support/GraphWriter.h
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@ -325,7 +325,10 @@ template <typename GraphType>
std::string WriteGraph(const GraphType &G, const Twine &Name, std::string WriteGraph(const GraphType &G, const Twine &Name,
bool ShortNames = false, const Twine &Title = "") { bool ShortNames = false, const Twine &Title = "") {
int FD; int FD;
std::string Filename = createGraphFilename(Name, FD); // Windows can't always handle long paths, so limit the length of the name.
std::string N = Name.str();
N = N.substr(0, std::min<std::size_t>(N.size(), 140));
std::string Filename = createGraphFilename(N, FD);
raw_fd_ostream O(FD, /*shouldClose=*/ true); raw_fd_ostream O(FD, /*shouldClose=*/ true);
if (FD == -1) { if (FD == -1) {