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commit 8ed005daf0ab of glibc-2.33 (Remove stat wrapper functions, move
them to exported symbols) removed renames of `__fxstat`, `__xstat`, and
`__lxstat` to `__fxstat64`, `__xstat64`, and `__lxstat64`, respectively.
But we relied on the renames to build `fd_64.c` properly. With glibc
2.33, we now see link failures of the POSIX runtime:
error: Linking globals named '__xstat': symbol multiply defined!
Rename the functions using `__REDIRECT_NTH` in the code as
`__USE_FILE_OFFSET64` case (which we define at the top of the file by
`#define _FILE_OFFSET_BITS 64`) did exactly that.
Fixes #1384.
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* failing malloc was not handled before, now returns null/ENOMEM
* when path is non-null and size is zero return null/EINVAL
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- `-DNDebug` -> `-DNDEBUG`
- different flags for `Release{+Debug,}+Asserts`
- `-g` is no longer part of common flags
- `-D_DEBUG` is now only set for debug builds
- removed unused `LIB_BC_FLAGS_{32,64}`
- added example, architecture prefix for specific flags
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Automatically detect if 32bit bitcode files can be built.
In this case, build runtime library with 32bit as well.
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used.
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compile it with -D_FORTIFY_SOURCE=0 to avoid infinite recursion.
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Every runtime library can be build with multiple configurations.
Replace the Makefile-based setup by cmake one.
Currently, we generate 32bit and 64bit libraries simultaneously and can link against them.
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This was executing the loop when n==0 leading to an out of bound pointer
error.
Found while verifying Rust code that compares strings.
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Co-authored-by: Felix Rath <felix.rath@comsys.rwth-aachen.de>
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We implement the Itanium ABI unwinding base-API, and leave the
C++-specific parts to libcxxabi.
Co-authored-by: Lukas Wölfer <lukas.woelfer@rwth-aachen.de>
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with a test case.
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This is a thread-local version of __cxa_atexit (but, in the absence
of threads, it is sufficient to just call __cxa_atexit).
The test is based on the existing test for atexit in
test/Runtime/Uclibc/2008-03-04-libc-atexit-uses-dso-handle.c
The motivation for adding this function is to support the Rust standard
library that calls __cxa_thread_atexit_impl.
This function is usually a weak symbol but, in KLEE, this behaves like a call
to an unknown function and chaos ensues.
Worse, it happens just as the program is cleanly shutting itself down,
so programs that are cleanly exiting crash with the wrong message.
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This instrinsic detects whether the program is being executed
symbolically or concretely (i.e., using the libkleeRuntest library).
The intended usage (illustrated in the test program) is to
allow the test program to display the input values by invoking
any libraries it wants to.
This is especially valuable if you are constructing complex,
structured values and for languages like Rust (or C++) that have
rich libraries and print libraries.
For example, you might pick a symbolic value N with the
assumption "0 <= N < 10" and then pick N symbolic
values and write them to an array.
The resulting ktest file is a bit hard to understand compared with the
output of the standard print function in Rust/C++.
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to function names.
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Hoist increment of `sc` into the loop header.
Memory locations can only be written to if they are writeable.
Avoid concretising a value by writing it. If the location is not symbolic in the first place.
This avoids writing read-only memory locations.
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glibc 2.30 moved definition of getdents64 to dirent_ext.h. Hence, it
became visible to us (via dirent.h) and conflicts with our definition:
runtime/POSIX/fd_64.c:112:5: error: conflicting types for 'getdents64'
int getdents64(unsigned int fd, struct dirent *dirp, unsigned int count) {
^
/usr/include/bits/dirent_ext.h:29:18: note: previous declaration is here
extern __ssize_t getdents64 (int __fd, void *__buffer, size_t __length)
We use the parameters defined by kernel, not by userspace (libc). Both
glibc and uclibc define it as:
ssize_t __getdents64 (int fd, char *buf, size_t nbytes)
so follow it.
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consistent naming convention
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Otherwise optimizations done in klee won't have any effect.
Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
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* also adds klee-replay as dependency for systemtests
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add a corresponding check.
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test.
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To enable the POSIX support, the former implementation instrumented the
main function and inserted a call to `klee_init_env` at the beginning.
This has multiple disadvantages:
* debugging information was not correctly propagated leaving the call to
`klee_init_env` without debug information
* the main function always required `int arg, char**` as part of the
function definition of `main`
Based on the new linking infrastructure, we can now add an additional
wrapper `__klee_posix_wraper(int, char**)` that gets always called when
POSIX support is enabled. It executes `klee_init_env` and after that
calls the `main` function.
Enabling POSIX support only requires the renaming of the user provided
`main` into `__klee_posix_wrapped_main` in addition to linking.
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