https://bugs.llvm.org/show_bug.cgi?id=35078
Bug ID: 35078
Summary: Exception thrown from a method marked noexcept
Product: libc++
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: All Bugs
Assignee: unassignedclangb...@nondot.org
Reporter: juan.arri...@nablazerolabs.com
CC: llvm-bugs@lists.llvm.org, mclow.li...@gmail.com
Created attachment 19341
--> https://bugs.llvm.org/attachment.cgi?id=19341&action=edit
Minimal code to reproduce the example
Overview:
An exception of type `filesystem_error` is thrown when calling the method
`recursive_directory_iterator::increment(error_code&) noexcept` on an iterator
pointing to a directory without `execute` permission. This leads to an
inability of catching the exception, and a termination of the program via
`SIGABRT` (in macOS).
Steps to Reproduce:
In macOS:
1. mkdir fail
2. touch fail/empty
3. chmod -x fail
4. clang++ minimal.cpp -std=c++17 -lc++experimental
5. ./a.out fail/
Actual Results:
"fail/empty"
about to increment iterator
libc++abi.dylib: terminating with uncaught exception of type
std::experimental::filesystem::v1::filesystem_error:
std::experimental::filesystem::posix_stat: Permission denied
Abort trap: 6
Expected Results:
A line similar to the following one:
Error [some error code]: [some error message]
Build Date and Hardware:
October 25, 2017 / macOS High Sierra 10.13.
Additional Information:
Compile companion program as:
clang++ minimal.cpp -std=c++17 -lc++experimental -save-temps
Version Used:
clang++ --version
clang version 6.0.0 (http://llvm.org/git/clang.git
fbbb8c17f50e6bb450a12965d30ac47a12c9aa58) (http://llvm.org/git/llvm.git
965aad0dee88dcaef11b887d8f8cc905ca43cfab)
Target: x86_64-apple-darwin17.0.0
Thread model: posix
InstalledDir: /usr/local/bin
Problem Location:
Line 2,063 in `include/experimental/filesystem` defines:
recursive_directory_iterator& increment(error_code& __ec) _NOEXCEPT
{ return __increment(&__ec); }
and line 2,098 in the same file declares:
recursive_directory_iterator& __increment(error_code *__ec=nullptr);
Implementation is in line 204 of
`src/experimental/filesystem/directory_iterator.cpp`:
directory_iterator& directory_iterator::__increment(error_code *ec)
{
_LIBCPP_ASSERT(__imp_, "Attempting to increment an invalid
iterator");
std::error_code m_ec;
if (!__imp_->advance(m_ec)) {
__imp_.reset();
if (m_ec)
set_or_throw(m_ec, ec, "directory_iterator::operator++()");
} else {
if (ec) ec->clear();
}
return *this;
}
Given that a noexcept(true) method throws an exception, the application
terminates
via `SIGABRT` after `__cxa_rethrow`.
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