It is now an inter-checker communication API, similar to the one that
connects MallocChecker/CStringChecker/InnerPointerChecker: simply a set of
setters and getters for a state trait.
Differential Revision: https://reviews.llvm.org/D59861
llvm-svn: 357326
The transfer function for the CFG element that represents a logical operation
computes the value of the operation and does nothing else. The element
appears after all the short circuit decisions were made, so they don't need
to be made again at this point.
Because our expression evaluation is imprecise, it is often hard to
discriminate between:
(1) we don't know the value of the RHS because we failed to evaluate it
and
(2) we don't know the value of the RHS because it didn't need to be evaluated.
This is hard because it depends on our knowledge about the value of the LHS
(eg., if LHS is true, then RHS in (LHS || RHS) doesn't need to be computed)
but LHS itself may have been evaluated imprecisely and we don't know whether
it is true or not. Additionally, the Analyzer wouldn't necessarily even remember
what the value of the LHS was because theoretically it's not really necessary
to know it for any future evaluations.
In order to work around these issues, the transfer function for logical
operations consists in looking at the ExplodedGraph we've constructed so far
in order to figure out from which CFG direction did we arrive here.
Such post-factum backtracking that doesn't involve looking up LHS and RHS values
is usually possible. However sometimes it fails because when we deduplicate
exploded nodes with the same program point and the same program state we may end
up in a situation when we reached the same program point from two or more
different directions.
By removing the assertion, we admit that the procedure indeed sometimes fails to
work. When it fails, we also admit that we don't know the value of the logical
operator.
Differential Revision: https://reviews.llvm.org/D59857
llvm-svn: 357325
Almost all path-sensitive checkers need to tell the user when something specific
to that checker happens along the execution path but does not constitute a bug
on its own. For instance, a call to operator delete in C++ has consequences
that are specific to a use-after-free bug. Deleting an object is not a bug
on its own, but when the Analyzer finds an execution path on which a deleted
object is used, it'll have to explain to the user when exactly during that path
did the deallocation take place.
Historically such custom notes were added by implementing "bug report visitors".
These visitors were post-processing bug reports by visiting every ExplodedNode
along the path and emitting path notes whenever they noticed that a change that
is relevant to a bug report occurs within the program state. For example,
it emits a "memory is deallocated" note when it notices that a pointer changes
its state from "allocated" to "deleted".
The "visitor" approach is powerful and efficient but hard to use because
such preprocessing implies that the developer first models the effects
of the event (say, changes the pointer's state from "allocated" to "deleted"
as part of operator delete()'s transfer function) and then forgets what happened
and later tries to reverse-engineer itself and figure out what did it do
by looking at the report.
The proposed approach tries to avoid discarding the information that was
available when the transfer function was evaluated. Instead, it allows the
developer to capture all the necessary information into a closure that
will be automatically invoked later in order to produce the actual note.
This should reduce boilerplate and avoid very painful logic duplication.
On the technical side, the closure is a lambda that's put into a special kind of
a program point tag, and a special bug report visitor visits all nodes in the
report and invokes all note-producing closures it finds along the path.
For now it is up to the lambda to make sure that the note is actually relevant
to the report. For instance, a memory deallocation note would be irrelevant when
we're reporting a division by zero bug or if we're reporting a use-after-free
of a different, unrelated chunk of memory. The lambda can figure these thing out
by looking at the bug report object that's passed into it.
A single checker is refactored to make use of the new functionality: MIGChecker.
Its program state is trivial, making it an easy testing ground for the first
version of the API.
Differential Revision: https://reviews.llvm.org/D58367
llvm-svn: 357323
With the current WebAssembly backend, objects built with -fPIC are not
compatible with static linking. libc++abi was (mistakenly?) adding
-fPIC to the objects it was including in a static library.
IIUC this change should also mean the static build can be more efficient
on all platforms.
Differential Revision: https://reviews.llvm.org/D60005
llvm-svn: 357322
Summary:
This feature is not actually used for anything in the WebAssembly
backend, but adding it allows users to get it into the target features
sections of their objects, which makes these objects
future-compatible.
Reviewers: aheejin, dschuff
Subscribers: sbc100, jgravelle-google, hiraditya, sunfish, jdoerfert, cfe-commits, llvm-commits
Tags: #clang, #llvm
Differential Revision: https://reviews.llvm.org/D60013
llvm-svn: 357321
Summary:
This lets us avoid e.g. checking if A >=s B in getSMaxExpr(A, B) if we've
already established that (A smax B) is the best we can do.
Fixes PR41225.
Reviewers: asbirlea
Subscribers: mcrosier, jlebar, bixia, jdoerfert, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D60010
llvm-svn: 357320
This adds support for v2s32 vector inserts, and updates the selection +
regbankselect tests for G_INSERT_VECTOR_ELT.
Differential Revision: https://reviews.llvm.org/D59910
llvm-svn: 357318
We need XMM registers to handle varargs with the Win64 ABI. Before we would
silently generate bad code resulting in an assertion failure elsewhere in the
backend.
llvm-svn: 357317
Fix the crash resulting from a careless use of getLocWithOffset. At the
beginning of a macro expansion it produces an invalid SourceLocation that causes
an assertion failure later on.
llvm-svn: 357312
Summary:
Makes it a linker error if the "atomics" feature is used but the user
does not opt in to shared memory or if "atomics" is disallowed but the
user does opt in to shared memory. Also check that an appropriate max
memory size is supplied if shared memory is used.
Reviewers: sbc100, aheejin
Subscribers: dschuff, jgravelle-google, sunfish, jfb, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D59281
llvm-svn: 357310
Generate import modules for each imported DLL, along with its symbol stream.
Also create COFF groups in the * Linker * module, one for each PartialSection (input, unmerged sections)
Currently COFF groups are disabled for MINGW because it significantly increases PDB sizes. We could enable that later with an option.
The overall objective for this change is to support code hot patching tools. Such tools need to know the import libraries used, from the PDB alone.
Differential Revision: https://reviews.llvm.org/D54802
llvm-svn: 357308
This patch limits the scope of the python header to the implementation
of the python script interpreter plugin. ScriptInterpreterPython is now
an abstract interface that doesn't expose any Python specific types, and
is implemented by the ScriptInterpreterPythonImpl.
Differential revision: https://reviews.llvm.org/D59976
llvm-svn: 357307
This guards against unintended ADL issues.
Thanks to Thomas Rogers for the patch.
Differential Revision: https://reviews.llvm.org/D60009
llvm-svn: 357306
Summary:
This fixes crashes when a BB in which an END_LOOP is to be placed is
unreachable and does not have any predecessors. Fixes PR41307.
Reviewers: dschuff
Subscribers: yurydelendik, sbc100, jgravelle-google, sunfish, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D60004
llvm-svn: 357303
Since this can be set with s_setreg*, it should not be a subtarget
property. Set a default based on the calling convention, and Introduce
a new amdgpu-dx10-clamp attribute to override this if desired.
Also introduce a new amdgpu-ieee attribute to match.
The values need to match to allow inlining. I think it is OK for the
caller's dx10-clamp attribute to override the callee, but there
doesn't appear to be the infrastructure to do this currently without
definining the attribute in the generic Attributes.td.
Eventually the calling convention lowering will need to insert a mode
switch somewhere for these.
llvm-svn: 357302
Fixes the assertion
> no Attr* for AttributedType*
> UNREACHABLE executed at llvm-project/clang/lib/Sema/SemaType.cpp:298!
In `TypeProcessingState::getAttributedType` we put into `AttrsForTypes`
types with `auto` but later in
`TypeProcessingState::takeAttrForAttributedType` we use transformed
types and that's why cannot find `Attr` corresponding to
`AttributedType`.
Fix by keeping `AttrsForTypes` up to date after replacing `AutoType`.
rdar://problem/47689465
Reviewers: rsmith, arphaman, aaron.ballman
Reviewed By: aaron.ballman
Subscribers: jkorous, dexonsmith, jdoerfert, cfe-commits
Differential Revision: https://reviews.llvm.org/D58659
llvm-svn: 357298
Android does not allow shared text relocations. Enable the linker
warning to detect them by default.
Reviewers: srhines, pirama
Reviewed By: srhines
Subscribers: cfe-commits
Differential Revision: https://reviews.llvm.org/D53344
llvm-svn: 357296
Some more additions to the script - mainly reducing the clang args after
the creduce run by removing them one by one and seeing if the crash
reproduces. Other things:
- remove the --crash flag when "fatal error" occurs
- fixed to read stack trace functions from the top
- run creduce on a copy of the original file
Patch by Amy Huang!
Differential Revision: https://reviews.llvm.org/D59725
llvm-svn: 357290
Document the intended use of the `.amdgcn.next_free_{s,v}gpr` in the
context of multiple kernels and functions.
Differential Revision: https://reviews.llvm.org/D59949
llvm-svn: 357289
The utility library shouldn't depend on curses, libedit or python. Move
curses to core, libedit to host and python to the python plugin.
Differential revision: https://reviews.llvm.org/D59970
llvm-svn: 357287
Effectively reverts r337612. The issues that cropped up with the last
attempt appear to have gone away.
Differential Revision: https://reviews.llvm.org/D59008
llvm-svn: 357285
Summary:
Nodes that have no uses are eventually pruned when they are selected
from the worklist. Record nodes newly added to the worklist or DAG and
perform pruning after every combine attempt.
Reviewers: efriedma, RKSimon, craig.topper, spatel, jyknight
Reviewed By: jyknight
Subscribers: jdoerfert, jyknight, nemanjai, jvesely, nhaehnle, javed.absar, hiraditya, jsji, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D58070
llvm-svn: 357283
FindPythonInterp and FindPythonLibs do two things, they set some
variables (PYTHON_LIBRARIES, PYTHON_INCLUDE_DIRS) and update the cached
variables (PYTHON_LIBRARY, PYTHON_INCLUDE_DIR) which are also used to
specify a custom python installation.
I believe the canonical way to do this is to use the PYTHON_LIBRARIES
and PYTHON_INCLUDE_DIRS variables instead of the cached ones. However,
since the cached variables are accessible from the cache and GUI, this
is a lot less confusing when you're trying to debug why a variable did
or didn't get the value you expected. Furthermore, as far as I can tell,
the implementation uses the cached variables to set their LIBRARIES/DIRS
counterparts. This is also the reason this works today even though we
mix-and-match.
Differential revision: https://reviews.llvm.org/D59968
llvm-svn: 357282
Summary:
Various SelectionDAG non-combine operations (e.g. the getNode smart
constructor and legalization) may leave dangling nodes by applying
optimizations without fully pruning unused result values. This results
in nodes that are never added to the worklist and therefore can not be
pruned.
Add a node inserter for the combiner to make sure such nodes have the
chance of being pruned. This allows a number of additional peephole
optimizations.
Reviewers: efriedma, RKSimon, craig.topper, jyknight
Reviewed By: jyknight
Subscribers: msearles, jyknight, sdardis, nemanjai, javed.absar, hiraditya, jrtc27, atanasyan, jsji, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D58068
llvm-svn: 357279
Todd added this empty readline module to workaround an issue with an old
version of Python on Ubuntu in 2014 (18841). In the meantime, libedit
seems to have fixed the underlying issue, and indeed, I wasn't able to
reproduce this.
Differential revision: https://reviews.llvm.org/D59972
llvm-svn: 357277
Alina Sbirlea