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library.
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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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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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- If an unknown intrinsic appears in the bitcode file,
it is reported but execution can proceed.
- If an unknown intrinsic is encountered during execution of some path,
- the intrinsic is reported
- this path is treated as an error
- execution of other paths can proceed
To be more precise, there is a list of "known unknown intrinsics".
Intrinsics not on this list will prevent execution.
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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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Changes:
- IntrinsicCleaner accepts fshr/fshl as accepted intrinsics
- Executor::executeCall converts fshr/fshl to urem/zext/concat/shift/extract
- Klee/main suppresses warnings about externals that are LLVM reserved
(i.e., begin with "llvm.")
- New test exercises 32 and 7 bit versions including oversize shift values
Test values are based on LLVM's test for fshl/fshr
- Changes that depend on existence of fshr/fshl are guarded by
#if LLVM_VERSION_CODE >= LLVM_VERSION(7, 0)
or
; REQUIRES: geq-llvm-7.0
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* extend help messages for -max-memory and -max-memory-inhibit
* introduces branchingPermitted()
* enforces fork/branch limits in branch() (vector version)
* changes main loop
* calls updateStates() before checkMemoryUsage()
* calls updateStates() again in case we early terminate states
This should prevent double termination for now. Other solutions are
imho more expensive as we would have to compare possibly large
vectors of states (either states(arr) in checkMemoryUsage() or
removedStates in terminateState()).
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variadic arguments
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and reformatted comments.
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byval attribute
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Read strings from different parts of objects.
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Tracking function locations separately correctly without prefixing
it with a directory.
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Assuming a `klee-out-*` directory is moved to a different path location, subsequent analysis of the run.istats with KCachegrind focusing on assembly is impossible as the `assembly.ll` cannot be found.
The reason is that the absolute path of the object file (assembly.ll) is hard-coded as part of the generated run.istats.
To fix this, assume that the file is local to the `run.istats`.
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Value transformation operates on word instead of byte arrays.
That means the Read indicies need to be adjusted to reflect that.
Previously IndexCleanerVisitor tried to remove the multiplications in the index
to covert byte indicies to word indicies. However as the two added test cases show
this is not sufficent. Therefore we remove the IndexCleanerVisistor and just divide
the index with word size which should always be correct.
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buildMixedSelectExpr was using the byte index for holes in the
select condition instead of the word based one. This only occured
if there was more than 1 hole.
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ArrayExprOptimizer read the UpdateList in the wrong order, which
meant that it used least recent update instead of the most recent one.
This patch fixes this as well as adds a test to illustrate the issue.
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llvm.objectsize is used in several optimisation during compile time. Lowering
these intrinsics took a conservative approach returning always the value for
unknown. Instead, lower to the object's real size, if possible. Otherwise,
a conservative value is used.
Since LLVM 4.0, the function `llvm::lowerObjectSizeCall()` does exactly
this. Use this function or preserve the old behaviour for older LLVM versions.
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dependency.
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