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[FileSystem] Ignore nanoseconds when comparing oso_mod_time 

After a recent change in LLVM the TimePoint encoding become more
precise, exceeding the precision of the TimePoint obtained from the
DebugMap. This patch adds a flag to the GetModificationTime helper in
the FileSystem to return the modification time with less precision.

Thanks to Davide for bisecting this failure on the LLDB bots.

llvm-svn: 347615
This commit is contained in:
Jonas Devlieghere 2018-11-26 23:40:52 +00:00
parent 9cc1ffadc5
commit 2765b067d2
3 changed files with 19 additions and 7 deletions
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8
lldb/include/lldb/Host/FileSystem.h
View File

@ -56,8 +56,12 @@ public:
/// Returns the modification time of the given file.
/// @{
llvm::sys::TimePoint<> GetModificationTime(const FileSpec &file_spec) const;
llvm::sys::TimePoint<> GetModificationTime(const llvm::Twine &path) const;
llvm::sys::TimePoint<>
GetModificationTime(const FileSpec &file_spec,
bool nanosecond_precision = true) const;
llvm::sys::TimePoint<>
GetModificationTime(const llvm::Twine &path,
bool nanosecond_precision = true) const;
/// @}
/// Returns the on-disk size of the given file in bytes.

15
lldb/source/Host/common/FileSystem.cpp
View File

@ -64,15 +64,22 @@ Optional<FileSystem> &FileSystem::InstanceImpl() {
}
sys::TimePoint<>
FileSystem::GetModificationTime(const FileSpec &file_spec) const {
return GetModificationTime(file_spec.GetPath());
FileSystem::GetModificationTime(const FileSpec &file_spec,
bool nanosecond_precision) const {
return GetModificationTime(file_spec.GetPath(), nanosecond_precision);
}
sys::TimePoint<> FileSystem::GetModificationTime(const Twine &path) const {
sys::TimePoint<>
FileSystem::GetModificationTime(const Twine &path,
bool nanosecond_precision) const {
ErrorOr<vfs::Status> status = m_fs->status(path);
if (!status)
return sys::TimePoint<>();
return status->getLastModificationTime();
if (nanosecond_precision)
return status->getLastModificationTime();
else
return std::chrono::time_point_cast<std::chrono::seconds>(
status->getLastModificationTime());
}
uint64_t FileSystem::GetByteSize(const FileSpec &file_spec) const {

3
lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARFDebugMap.cpp
View File

@ -420,7 +420,8 @@ Module *SymbolFileDWARFDebugMap::GetModuleByCompUnitInfo(
FileSpec oso_file(oso_path);
ConstString oso_object;
if (FileSystem::Instance().Exists(oso_file)) {
auto oso_mod_time = FileSystem::Instance().GetModificationTime(oso_file);
auto oso_mod_time = FileSystem::Instance().GetModificationTime(
oso_file, /*nanosecond_precision=*/false);
if (oso_mod_time != comp_unit_info->oso_mod_time) {
obj_file->GetModule()->ReportError(
"debug map object file '%s' has changed (actual time is "