The address sanitizer ignore memory accesses from different address
spaces, however when instrumenting globals the check for different
address spaces is missing. This result in assertion failure. The fault
was found in an out of tree target.
The patch skip all globals of non default address space.
Reviewed By: leonardchan, vitalybuka
Differential Revision: https://reviews.llvm.org/D68790
If the instruction have match pattern, llvm-tblgen will infer the sideeffect bit from the match pattern and it works well.
If not, the tblgen will set it as true that hurt the scheduling.
PowerPC has some instructions that didn't specify the match pattern(i.e. LXSD etc), which is manually selected post-ra according
to the register pressure. We need to clear the sideeffect flag for these instructions.
Differential Revision: https://reviews.llvm.org/D69232
Teach combineVectorSizedSetCCEquality() to handle arbitrary memcmp
expansions but do not change any default policy for now.
This also fixes a bug in the memcmp expansion itself when large
displacements are needed.
https://reviews.llvm.org/D69507
Summary:
Parse the indirect symbol table and update the indexes of
symbol entries in the table in the writer in case they have
been changed.
Reviewers: alexshap, rupprecht, jhenderson
Reviewed By: alexshap, rupprecht
Subscribers: jakehehrlich, abrachet, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D66280
This fixes:
ld.lld: error: undefined symbol: vtable for llvm::orc::rpc::ResponseAbandoned
>>> referenced by lli.cpp
In -DBUILD_SHARED_LIBS=on builds, all directly referenced references must
be linked to appease -Wl,-z,defs.
When statically linking PIC code we create an internalized __memory_base
so that memory-base-relative relocation work correctly. The value of
this global should be zero, and not the globalBase since the globalBase
offset is already taken into account by getVirtualAddress.
Fixes: https://github.com/emscripten-core/emscripten/issues/9013
Differential Revision: https://reviews.llvm.org/D69600
Add the `-whitelist-filename-regex` option to restrict coverage
reporting to file paths that match a whitelist regex.
Patch by Michael Daniels!
rdar://56720320
Summary:
When createing an ORC remote JIT target the current library split forces the target process to link large portions of LLVM (Core, Execution Engine, JITLink, Object, MC, Passes, RuntimeDyld, Support, Target, and TransformUtils). This occurs because the ORC RPC interfaces rely on the static globals the ORC Error types require, which starts a cycle of pulling in more and more.
This patch breaks the ORC RPC Error implementations out into an "OrcError" library which only depends on LLVM Support. It also pulls the ORC RPC headers into their own subdirectory.
With this patch code can include the Orc/RPC/*.h headers and will only incur link dependencies on LLVMOrcError and LLVMSupport.
Reviewers: lhames
Reviewed By: lhames
Subscribers: mgorny, hiraditya, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D68732
Constexpr data member conversions work by starting with the class that
originally introduced the field, and converting from there to the type
that the user desires. Before this change, Clang was using the
inheritance model from the final destination class type instead of the
model from the class that originally introduced the field. To fix this,
find the relevant FieldDecl and take its parent class instead of using
the member pointer type the user provided.
Indirect field decls require some special handling to find the parent
class.
Fixes PR43803
Summary:
This happens when someone initializes a variable with guaranteed copy
elision and an added const qualifier. Fixes PR43826.
Reviewers: aaron.ballman, rsmith
Reviewed By: aaron.ballman
Differential Revision: https://reviews.llvm.org/D69533
Summary:
Add a flag `F_no_mmap` to `FileOutputBuffer` to support
`--[no-]mmap-output-file` in ELF LLD. LLD currently explicitly ignores
this flag for compatibility with GNU ld and gold.
We need this flag to speed up link time for large binaries in certain
scenarios. When we link some of our larger binaries we find that LLD
takes 50+ GB of memory, which causes memory pressure. The memory
pressure causes the VM to flush dirty pages of the output file to disk.
This is normally okay, since we should be flushing cold pages. However,
when using BtrFS with compression we need to write 128KB at a time when
we flush a page. If any page in that 128KB block is written again, then
it must be flushed a second time, and so on. Since LLD doesn't write
sequentially this causes write amplification. The same 128KB block will
end up being flushed multiple times, causing the linker to many times
more IO than necessary. We've observed 3-5x faster builds with
-no-mmap-output-file when we hit this scenario.
The bad scenario only applies to compressed filesystems, which group
together multiple pages into a single compressed block. I've tested
BtrFS, but the problem will be present for any compressed filesystem
on Linux, since it is caused by the VM.
Silently ignoring --no-mmap-output-file caused a silent regression when
we switched from gold to lld. We pass --no-mmap-output-file to fix this
edge case, but since lld silently ignored the flag we didn't realize it
wasn't being respected.
Benchmark building a 9 GB binary that exposes this edge case. I linked 3
times with --mmap-output-file and 3 times with --no-mmap-output-file and
took the average. The machine has 24 cores @ 2.4 GHz, 112 GB of RAM,
BtrFS mounted with -compress-force=zstd, and an 80% full disk.
| Mode | Time |
|---------|-------|
| mmap | 894 s |
| no mmap | 126 s |
When compression is disabled, BtrFS performs just as well with and
without mmap on this benchmark.
I was unable to reproduce the regression with any binaries in
lld-speed-test.
Reviewed By: ruiu, MaskRay
Differential Revision: https://reviews.llvm.org/D69294
Summary:
Move breakpoints from the old, bad ArgInfo::count to the new, better
ArgInfo::max_positional_args. Soon ArgInfo::count will be no more.
It looks like this functionality is already well tested by
`TestBreakpointCommandsFromPython.py`, so there's no need to write
additional tests for it.
Reviewers: labath, jingham, JDevlieghere
Reviewed By: labath
Subscribers: lldb-commits
Tags: #lldb
Differential Revision: https://reviews.llvm.org/D69468
This patch adds support for deleted C++ special member functions in
clang and llvm. Also added Defaulted member encodings for future
support for defaulted member functions.
Patch by Sourabh Singh Tomar!
Differential Revision: https://reviews.llvm.org/D69215
I had hoped that I could have some
```
.. code-block:: MIR
```
sections for MIR examples which causes a warning about pygments not
supporting it but we have warnings treated as errors
Summary:
I haven't refreshed the Function Calls section as I don't feel I have
sufficient knowledge of that area. It would be appreciated if someone could
review that section.
Note: I'm aware that pygments doesn't support 'mir' as used in one of the
code-block directives. This currently emits a warning and I decided to
keep it to enable finding them later. Maybe we can teach pygments to
support it.
Depends on D69456
Reviewers: volkan, aditya_nandakumar
Subscribers: rovka, Petar.Avramovic, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D69457
Enable the new SelectionDAG representation for unordered loads and stores introduced in r371441 by default. As a reminder, the new lowering changes the representation of an unordered atomic load from an AtomicSDNode - which is essentially a black box which gets passed through without combines messing with it - to a LoadSDNode w/a atomic marker on the MMO. The later parallels the way we handle volatiles, and I've audited the code to ensure that every location which checks one checks the other.
This has been fairly heavily fuzzed, and I examined diffs in a reasonable large corpus of assembly by hand, so I'm reasonable sure this is correct for the common case. Late in the review for this, it was discovered that I hadn't correctly handled cases which could be legalized into CAS operations. This points out that there's a strong bias in the IR of the frontend I'm working with towards only legal atomics. If there are problems with this patch, the most likely area will be legalization.
Differential Revision: https://reviews.llvm.org/D69219
When using lit's internal shell, RUN lines like the following
accidentally execute an external `diff` instead of lit's internal
`diff`:
```
# RUN: program | diff file -
```
Such cases exist now, in `clang/test/Analysis` for example. We are
preparing patches to ensure lit's internal `diff` is called in such
cases, which will then fail because lit's internal `diff` doesn't
recognize `-` as a command-line option. This patch adds support for
`-` to mean stdin.
Reviewed By: probinson, rnk
Differential Revision: https://reviews.llvm.org/D67643
When using lit's internal shell, RUN lines like the following
accidentally execute an external `diff` instead of lit's internal
`diff`:
```
# RUN: program | diff file -
# RUN: not diff file1 file2 | FileCheck %s
```
Such cases exist now, in `clang/test/Analysis` for example. We are
preparing patches to ensure lit's internal `diff` is called in such
cases, which will then fail because lit's internal `diff` cannot
currently be used in pipelines and doesn't recognize `-` as a
command-line option.
To enable pipelines, this patch moves lit's `diff` implementation into
an out-of-process script, similar to lit's `cat` implementation. A
follow-up patch will implement `-` to mean stdin.
Also, when lit's `diff` prints differences to stdout in Windows, this
patch ensures it always terminate lines with `\n` not `\r\n`. That
way, strict FileCheck directives checking the `diff` output succeed in
both Linux and Windows. This wasn't an issue when `diff` was internal
to lit because `diff` didn't then write to the true stdout, which is
where the `\n` -> `\r\n` conversion happened in Python.
Reviewed By: probinson, stella.stamenova
Differential Revision: https://reviews.llvm.org/D66574
This catches some cases. There are probably ways to improve this.
I tried doing it as a combine on the setcc, but that broke
some cases involving flag reuse in place of test.
I renamed the isX86CCUnsigned to isX86CCSigned and flipped its
polarity to make it consistent with the similar functions for
ISD::SETCC. This avoids calling EQ/NE as being signed or unsigned.
Fixes PR43823.
Differential Revision: https://reviews.llvm.org/D69499
Summary:
Rewrite the pipeline overview to be more focused on the structure and
flexibility as well as highlight the increased usefulness of
MachineVerifier and increased testability resulting from the smaller
incremental passes approach.
The diagrams are lifted from the slides for the LLVMDev 2019 talk
'Generating Optimized Code with GlobalISel' and adapted to be readable on
the white background used in the docs.
Reviewers: volkan
Subscribers: rovka, Petar.Avramovic, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D69456
Demonstrates missed opportunity to combine to the VBMI2 SHLDV/SHRDV ops - combineOrShiftToFunnelShift should handle vector ops (and we should eventually move this to DAGCombine).
Summary:
When the ABI namespace isn't a reserved identifier, we were issuing a
warning, but this should have been an error since the beginning. This
commit enforces that the ABI namespace is a reserved identifier, and
changes the ABI namespace used by LibFuzzer.
Reviewers: phosek, EricWF
Subscribers: mgorny, christof, jkorous, dexonsmith, #sanitizers, libcxx-commits, llvm-commits
Tags: #sanitizers, #libc, #llvm
Differential Revision: https://reviews.llvm.org/D69408
This reverts commit ec66603ac7. It was
causing ubsan failures like the following on the ubsan bot:
llvm/lib/Support/SourceMgr.cpp:440:48: runtime error: pointer index expression with base 0x000000000000 overflowed to 0xfffffffffffffffa
Adding patten matching for two SVE intrinsics: frecps and frsqrts.
Also added patterns for fsub and fmul - these SDNodes directly correspond
to machine instructions.
Review: https://reviews.llvm.org/D68476
Patch authored by mgudim (Mikhail Gudim).
Guillaume Chatelet