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This is based off intial work by @jirislaby in #481. However it
has been substantially modified.
Notably it includes a separate build sytem to build the runtimes which
is inspired by the old build system. The reason for doing this is
because CMake is not well suited for building the runtime:
* CMake is configured to use the host compiler, not the bitcode
compiler. These are not the same thing.
* Building the runtime using `add_custom_command()` is flawed
because we can't automatically get transitive depencies (i.e.
header file dependencies) unless the CMake generator is makefiles.
(See `IMPLICIT_DEPENDS` of `add_custom_command()` in CMake).
So for now we have a very simple build system for building the runtimes.
In the future we can replace this with something more sophisticated if
we need it.
Support for all features of the old build system are implemented apart
from recording the git revision and showing it in the output of
`klee --help`.
Another notable change is the CMake build system works much better with
LLVM installs which don't ship with testing tools. The build system
will download the sources for `FileCheck` and `not` tools if the
corresponding binaries aren't available and will build them. However
`lit` (availabe via `pip install lit`) and GTest must already be
installed.
Apart from better support for testing a significant advantage of the
new CMake build system compared to the existing "Autoconf/Makefile"
build system is that it is **not** coupled to LLVM's build system
(unlike the existing build system). This means that LLVM's
autoconf/Makefiles don't need to be installed somewhere on the system.
Currently all tests pass.
Support has been implemented in TravisCI and the Dockerfile for
building with CMake.
The existing "Autoconf/Makefile" build system has been left intact
and so both build systems can coexist for a short while. We should
remove the old build system as soon as possible though because it
creates an unnecessary maintance burden.
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runAndGetCexForked())
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`dirty` flag if we remove `llvm.trap` from the module.
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remove mimic_stp option and the associated ITE chain construction for variable shift operations
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* Add unittest to check that the `Assignment` class can evaluate
expressions containing a `NotOptimizedExpr`.
* Fix the `AssignmentTest.FoldNotOptimized` unit test by
teaching the `ExprEvaluator` to fold `NotOptimizedExpr` nodes.
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operators
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It is pain for build systems to see __DATE__ or __TIME__ in sources as
the build is not reproducible. So disable the timestamping by default
and add an option to enable it if somebody is really after it.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
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klee_warning, and klee_error
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Extended support for assembler raising
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function) (#455)
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`-debug-crosscheck-core-solver` as requested by Cristian
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with another solver. For example the core solver can be STP and the
cross checking solver can be Z3.
Unfortunately a few fragile tests don't pass when actually using this
option.
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Improved support for assembler handling.
Providing additional triple information
to raise assembler for supported architectures
only.
Implemented support for raising full assembly
memory fence.
Added initial support for memory fences in Executor.
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Fix to PTree pointer use-after-delete
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Fix for klee_get_obj_size() crashing on 64-bit, resolves #446
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It allows stopping the execution on some conditions like assertions.
The use is like:
klee -exit-on-error-type=Assert -exit-on-error-type=External file.llvm
This is especially useful in the SV-COMP.
A test to cover the new parameter was added too.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
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In some Solver sources, some error outputs were missing \n. Instead of
adding a new line to all of them, convert the fprintf's to
klee_warning which adds \n automatically.
ErrorHandling.h had to be included in MetaSMTSolver.cpp to have
klee_warning declared there.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
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MemoryUsage: handle ill-designed mallinfo
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The mallinfo() interface is ill-designed. It returns 'int' as occupied
memory. This means at most 2G. This causes troubles when capping the
memory to 3G by -max-memory=3000 for example.
We cannot fix the interface, but we can at least extend the space to
4G. So cast those 'int's to 'unsigned int's to avoid sign extension.
Then do the addition on 'size_t' to count on 64bit values (on 64 bit).
Apart from that, the original 'int' + 'int' led to overflow which is
undefined on 'signed int's in C.
Also, when klee is run under valgrind, generic.current_allocated_bytes
from gperftools does not touch the passed pointer and in that case, we
return garbage from GetTotalMallocUsage. So initialize 'value' to 0 to
avoid the problem.
And since GetNumericProperty accepts 'size_t', let's define 'value' as
such. It was 'uint64_t' previously and they differ on 32 bit.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
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Added test case exposing division by zero failure reported by @kren1 and made division total in STP to fix it.
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Sometimes, globals are not sized and ->getTypeStoreSize on such type
crashes inside the LLVM. Check whether type is sized prior to calling
the function above.
A minimalistic example of Y being unsized with no effect on the actual
code is put to tests.
[v2]
Use klee_warning for printing. And use %.*s formatting string given
StringRef.data() need not be null terminated.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
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Allows to provide 0 as an address to allocate deterministic memory
area at any free space.
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Generated STP equality expressions have to be the same type.
If a shift with different types as operands was used,
therefore equality expressions of different width were generated.
Beside avoiding the different sizes, this patch restores the
original behavior to extract just the part involved in shifting
and therefore should generate smaller expressions.
Enable sdiv test case
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Deterministic allocation provides an internal allocator which
mmaps memory to a fixed static address.
This way, same allocation is assured across different KLEE runs
for the same application assuming a deterministic searcher.
In addition, this patch provides following options:
-allocate-determ: switch on/off deterministic allocation
-allocate-determ-size: adjust preallocated memory
-null-on-zero-malloc: returns null pointer in case a malloc
of size 0 was requested. According to standard, also a non-null pointer
can be returned (which happens with the default glibc malloc implementation)
-allocation-space: space between allocations can be adjusted. KLEE is not able
to detect out-of-bound accesses which are inside another but wrong object.
Due the implementation of typical allocators adjacent mallocs have space
in between for management purposes. This spaces helped KLEE to detect off-by-1/2 accesses.
For higher numbers, the allocation space has to be increased.
-allocate-determ-start-address: adjust deterministic start address. The addres
has to be page aligned. KLEE fails if it cannot acquire this address
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For vararg handling, arguments of size bigger than 64 bit need
to be handled 128bit aligned according to AMD calling conventions
AMD64-ABI 3.5.7p5.
To handle that case correctly, we do:
1) make sure that every argument is aligned correctly in
an allocation for function arguments
2) the allocation itself is aligned correctly
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This patch generates the states based on the order of switch-cases.
Before, switch-constraints were randomly assigned to forked states.
As generated code might be different between LLVM versions,
we use the case values, order them, and iterate in that order
over the cases.
This way we can also support deterministic execution of older LLVM
versions.
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Deterministic adding/removing of states.
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Support gzip-based compression of raw_outstreams
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Provide initial zlib-based compression support for
raw_outstreams. Replacing llvm::raw_fd_outstreams
with compressed_fd_outstreams automatically compresses
data in gzip format before writing to file.
Options added:
* --compress-log to compress all query log files (e.g. *.pc, *.smt2) on
the fly. Every query log file gets extended with .gz.
* --debug-compress-instructions to compress logfile for instruction
stream on the fly.
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Add -stats-write-after-instructions and -istats-write-after-instructions
to update each statistic after n steps.
Furthermore, the metric "minimal distance to uncovered state" is now
updated independently if statistics are enabled or not.
This metric is needed i.e. by weighted random searchers directed towards
uncovered instructions.
Remove some dead code.
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have the same bv width
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64, so that the first two arguments of the call bvVarRightShift(extend_npm, expr_shpost, 64) have the same bitwidth of 64.
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Use klee_message for timeout information
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