Currently, FunctionAttrs treats landingpads as non-throwing, and
will infer nounwind for functions with landingpads (assuming they
can't unwind in some other way, e.g. via resum). There are two
problems with this:

* Non-cleanup landingpads with catch/filter clauses do not
  necessarily catch all exceptions. Unless there are catch ptr null
  or filter [0 x ptr] zeroinitializer clauses, we should assume
  that we may unwind past this landingpad. This seems like an
  outright bug.
* Cleanup landingpads are skipped during phase one unwinding, so
  we effectively need to support unwinding past them. Marking these
  nounwind is technically correct, but not compatible with how
  unwinding works in reality.

Fixes https://github.com/llvm/llvm-project/issues/61945.

Differential Revision: https://reviews.llvm.org/D147694

Extra tests for D147330.

After performing signed extension, we update the register in MI. We should also update `incr` register which is tracking the register in `MI`.

Fixes https://github.com/llvm/llvm-project/issues/61882.

Reviewed By: #powerpc, shchenz

Differential Revision: https://reviews.llvm.org/D147594

foldAllocaCmp() needs to fold all comparisons of an alloca at the
same time, to ensure that there is a consistent view of the alloca
address. Currently, it folds "all" comparisons by limiting to the
case where there is only one. This patch switches the algorithm to
instead actually collect and fold all comparisons.

Something we need to be careful about here is that there may be
comparisons where both sides of the icmp are based on the alloca.
Such comparisons are comparing offsets of the alloca, and as such
can be ignored here, but shouldn't be folded to false.

Differential Revision: https://reviews.llvm.org/D144492

Embedded systems that do not use an ELF loader locate the
.ARM.exidx exception table via linker defined __exidx_start and
__exidx_end rather than use the PT_ARM_EXIDX program header. This
means that some linker scripts such as the picolibc C library's
linker script, do not have the .ARM.exidx sections at offset 0 in
the OutputSection. For example:

.except_unordered : {
    . = ALIGN(8);
    PROVIDE(__exidx_start = .);
    *(.ARM.exidx*)
    PROVIDE(__exidx_end = .);
} >flash AT>flash :text

This is within the specification of Arm exception tables, and is
handled correctly by ld.bfd.

This patch has 2 parts. The first updates the writing of the data
of the .ARM.exidx SyntheticSection to account for a non-zero
OutputSection offset. The second part makes the PT_ARM_EXIDX program
header generation a special case so that it covers only the
SyntheticSection and not the parent OutputSection. While not strictly
necessary for programs locating the exception tables via the symbols
it may cause ELF utilities that locate the exception tables via
the PT_ARM_EXIDX program header to fail. This does not seem to be the
case for GNU and LLVM readelf which seems to look for the
SHT_ARM_EXIDX section.

Differential Revision: https://reviews.llvm.org/D148033

Differential Revision: https://reviews.llvm.org/D148121

PAL Metadata 3.0 introduces an explicit structure in metadata for the
programmable registers written out by the compiler backend.
Rather than using opaque registers which can change between different
architectures and requires encoding the bitfield information in the backend,
which may change between versions.

This is the initial minimal implementation that enables the use of PAL Metadata
3.0.

The change itself should be NFC for non-PAL, although the way RSRC2 register is
handled has been changed slightly.

The test is fairly minimal, but checks that the metadata format looks as
expected and verifies a couple of special cases such as tgid_[xyz]_en handling
and PsInputAddr/Ena which also change to explicit fields.

Differential Revision: https://reviews.llvm.org/D147143

I believe !dereferencable violation is immediate undefined behavior,
but this was not explicitly spelled out in LangRef. We already
assume that !dereferenceable is implicitly !noundef and cannot
return poison in isGuaranteedNotToBeUndefOrPoison().

The reason why we made dereferenceable implicitly noundef is that
the purpose of this metadata is to allow speculation, and that
would not be legal on a potential poison pointer.

Differential Revision: https://reviews.llvm.org/D148202

The peephole optimizer tries to replace
```
%n:sgpr_32 = S_MOV_B32 x
$scc = COPY %n
```
with a `S_MOV_B32` directly into `$scc`.

This crashes because `S_MOV_B32` cannot take `$scc` as input.

We currently generate code like this from GlobalISel when lowering a
G_BRCOND with a constant condition. We should probably look into
removing this kind of branch altogether, but until then we should at
least not crash.

This patch fixes the issue by making sure we don't apply the peephole
optimization when trying to move into a physical register that
doesn't belong to the correct register class.

Differential Revision: https://reviews.llvm.org/D148117

The insertSpills() code will currently skip lifetime intrinsic users
when replacing the alloca with a frame reference. Rather than
leaving behind the dead lifetime intrinsics working on the old
alloca, directly remove them. This makes sure the alloca can be
dropped as well.

I noticed this as a regression when converting tests to opaque
pointers. Without opaque pointers, this code didn't really do
anything, because there would usually be a bitcast in between.
The lifetimes would get rewritten to the frame pointer. With
opaque pointers, this code now triggers and leaves behind users
of the old allocas.

Differential Revision: https://reviews.llvm.org/D148240

 No functional changes intended.

The revision separates out the LLVM dialect definition in a separate
tablegen file and ensures the LLVMOpBase.td can include the attributes
defined by LLVMAttrDefs.td. The change allows us to use LLVM dialect
attributes in the definition of the intrinsic and memory operation
base classes, e.g. to represent alias analysis metadata using
attributes.

Reviewed By: Dinistro

Differential Revision: https://reviews.llvm.org/D148007

This reverts commit 70de684d.

This causes a regression as described in #61785

/data/llvm-project/llvm/tools/llvm-exegesis/lib/BenchmarkRunner.cpp:66:2: error: extra ';' outside of a function is incompatible with C++98 [-Werror,-W
c++98-compat-extra-semi]
};
 ^
1 error generated.

This patch refactors some code out of FunctionExecutorImpl into the base
class that should be common across all implementations of
FunctionExecutor. Particularly, this patch factors out
accumulateCounterValues, and also factors out runAndSample, moving
implementation specific code into a new runWithCounter function. This
makes adding new implementations of FunctinExecutor easier.

Reviewed By: gchatelet

Differential Revision: https://reviews.llvm.org/D148079

This completes the FIXME listed in FunctionExecutor in regards to
deprecating this function. It simply makes the appropriate call into
runAndSample and grabs the first counter value. This patch completely
removes the function, moving that logic into the callers (currently only
uopsBenchmarkRunner). This makes creating new FunctionExecutors easier
as an implementation no longer needs to worry about this detail.

Reviewed By: gchatelet

Differential Revision: https://reviews.llvm.org/D147878

[[https://wg21.link/p1787 | P1787]]: CWG1894 and its duplicate CWG2199 are resolved per Richard’s proposal for [[ https://listarchives.isocpp.org/cgi-bin/wg21/message?wg=core&msg=28415 | “dr407 still leaves open questions about typedef / tag hiding” ]], using generic conflicting-declaration rules even for typedef, and discarding a redundant typedef-name when looking up an elaborated-type-specifier.
Wording: See changes to [dcl.typedef], [basic.lookup.elab], and [basic.lookup]/4.

Generic conflicting-declaration rules are specified in changes to [basic.scope.scope]. [[ https://cplusplus.github.io/CWG/issues/407.html | CWG407]], [[ https://cplusplus.github.io/CWG/issues/1894.html | CWG1894 ]], and [[ https://cplusplus.github.io/CWG/issues/2199.html | CWG2199 ]] discuss how elaborated type specifiers interact with typedefs, using directives, and using declarations. Since existing test for CWG407 covers examples provided in CWG1894 and CWG2199, and does it in accordance with P1787, I reused parts of it.

Reviewed By: #clang-language-wg, cor3ntin

Differential Revision: https://reviews.llvm.org/D148136

This implements the server side of the approach discussed at
https://github.com/clangd/vscode-clangd/pull/193#issuecomment-1044315732

Differential Revision: https://reviews.llvm.org/D143974

In the default link configuration, PLT stubs are created automatically
for R_RISCV_CALL_PLT relocations and the relocation itself is
transformed to R_RISCV_CALL (PerGraphGOTAndPLTStubsBuilder_ELF_riscv).
Only the latter is later handled when applying fixups and the former is
simply ignored.

This patch proposes to handle R_RISCV_CALL_PLT anyway when applying
fixups to support custom configurations that do not need automatic PLT
creation. An example of this is BOLT where PLT entries from the input
binary are reused (D147544).

Reviewed By: StephenFan

Differential Revision: https://reviews.llvm.org/D148238

Currenty, setting the -mbb-profile-dump dumps a CSV file with blocks
inside an individual function identified by their MBB numbers. This
patch changes the MBBs to be identified by their ID which is set at MBB
creation and not changed afterwards, making it inherently stable
throughout the backend. This alleviates concerns with the MBB IDs
changing between the profile dump and what ends up in the final object
file. The MBBs inside the SHT_LLVM_BB_ADDR_MAP sections are also
identified using their MBB ID rather than number, so if we want to match
them up we need to identify the MBBs here by number.

Reviewed By: mtrofin, rahmanl

Differential Revision: https://reviews.llvm.org/D147366

When dealing with "derived_array(j)%component" where derived_array
is not a contiguous array, but for which we know the extent, lowering
generates a fir.array_coor op on a !fir.box<!fir.array<cst x T>> with
a fir.slice containing "j" in the component path.

Codegen first computes "derived_array(j)" address using the byte
strides inside the descriptor, and then computes the offset of "j"
from that address with a second GEP.
The type of the address in that second GEP matters since "j" is passed
in the GEP via an index indicating its component position in the type.

The code was using the LLVM type of "derived_array" instead of
"derived_array(j)".
In general, with fir.box, the extent ("cst" above) is unknown and those
types match. But if the extent of "derived_array" is a compile time
constant, its LLVM type will be [cst x T] instead of T*, and the produced
GEP will compute the address of the nth T instead of the nth component
inside T leading to undefined behaviors.

Fix this by computing the element type for the second GEP.

Differential Revision: https://reviews.llvm.org/D148226

- Fix the BIND(C) assumed-shape case: TYPE(*) assumed shape are passed
  via CFI_cdesc_t according to Fortran 2018 standard 18.3.6 point 2 (5).
- Align the none BIND(C) case with the BIND(C) case. There is little
  point passing TYPE(*) assumed size via descriptor, use a simple
  address. C710 ensures there is no way the knowledge of the actual
  type will be required when manipulating the dummy.

Differential Revision: https://reviews.llvm.org/D148130

TYPE(*) arguments fell through in IS_CONTIGUOUS folding
because they are not Expr<SomeType>. Expose entry point for
symbols in IsContiguous and use that.

The added test revealed that IS_CONTIGUOUS was folded to
false for assumed rank arguments. Fix this: the contiguity of
assumed rank without the CONTIGUOUS argument can only be
verified at runtime.

Differential Revision: https://reviews.llvm.org/D148128

If llvm-symbolize did not find module, the error looked like:

    LLVMSymbolizer: error reading file: No such file or directory

This message does not follow common practice: LLVMSymbolizer is not an
utility name. Also the message did not not contain the name of missed file.

With this change the error message looks differently:

    llvm-symbolizer: error: 'abc': No such file or directory

This format is closer to messages produced by other utilities and allow
proper coloring.

Differential Revision: https://reviews.llvm.org/D148032

The motivation is to make an opportunity to compute and return
expressions after parsing ICmp into a range check (e.g. Length + 1).

Patch by Aleksandr Popov!

Differential Revision: https://reviews.llvm.org/D148205

When compiling compiler-rt with -fsanitize=undefined and running testcases you
end up with the following warnings:

UBSan: absvdi2.c:21:23: left shift of 1 by 63 places cannot be represented in type 'di_int' (aka 'long long')
UBSan: absvsi2.c:21:23: left shift of 1 by 31 places cannot be represented in type 'si_int' (aka 'long')
UBSan: negvdi2.c:20:32: left shift of 1 by 63 places cannot be represented in type 'di_int' (aka 'long long')
UBSan: negvsi2.c:20:32: left shift of 1 by 31 places cannot be represented in type 'si_int' (aka 'long')

This can be avoided by doing the shift in a matching unsigned variant of the
type.

This was found in an out of tree target.

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D146932

D147984 was reverted because it broke lit tests on Mac. This revision is based on D147984
but maintains the old behavior for Apple.

Note that, per the follow-up discussion with MaskRay in D147984, this patch excludes Apple
but includes other platforms (e.g., aarch64, MIPS64) and OSes (e.g., FreeBSD, S390X), not just
x86-64 Linux.

Original commit message from D147984:

Users have discovered [*] that when CONFIG_ARCH_MMAP_RND_BITS == 32,
it will frequently conflict with ASan's allocator on x86-64 Linux, because the
PIE program segment base address of 0x555555555554 plus an ASLR shift of up to
((2**32) * 4K == 0x100000000000) will sometimes exceed ASan's hardcoded
base address of 0x600000000000. We fix this by simply moving the allocator base
to 0x500000000000, which is below the PIE program segment base address. This is
cleaner than trying to move it to another location that is sandwiched between
the PIE program and library segments, because if either of those grow too large,
it will collide with the allocator region.

Note that we will never need to change this base address again (unless we want to increase
the size of the allocator), because ASLR cannot be set above 32-bits for x86-64 Linux (the
PIE program segment and library segments would collide with each other; see also
ARCH_MMAP_RND_BITS_MAX in https://github.com/torvalds/linux/blob/master/arch/x86/Kconfig).

[*] see https://b.corp.google.com/issues/276925478
and https://groups.google.com/a/google.com/g/chrome-os-gardeners/c/BbfzCP3dEeo/m/h3C_vVUxCQAJ

Differential Revision: https://reviews.llvm.org/D148280

This actually simplifies the code by performs a pre-pass of the stub
objects prior to LTO.

This should be the final change needed before we can make the switch
on the emscripten side: https://github.com/emscripten-core/emscripten/pull/18905

Differential Revision: https://reviews.llvm.org/D148287

We can't refer to template arguments for defvar statements in class
definitions, or it will report some errors like:

```
error: Variable not defined: 'xxx'.
```

The key point here is we used to pass nullptr to `ParseValue` in
`ParseDefvar`. As a result, we can't refer to template arguments
since `CurRec` is nullptr in `ParseIDValue`.

So we add an argument `CurRec` to `ParseDefvar` and provide it
when parsing defvar statements in class definitions.

Reviewed By: tra, simon_tatham

Differential Revision: https://reviews.llvm.org/D148197

The script incorrectly produced double slashes in paths, e.g.
`libcxx/src//thread.cpp`.

/data/llvm-project/third-party/unittest/googletest/include/gtest/gtest.h:1526:11: error: comparison of integers of different signs: 'const unsigned long long' and 'const int' [-Werror,-Wsign-compare]
  if (lhs == rhs) {
      ~~~ ^  ~~~
/data/llvm-project/third-party/unittest/googletest/include/gtest/gtest.h:1553:12: note: in instantiation of function template specialization 'testing::internal::CmpHelperEQ<unsigned long long, int>' requested here
    return CmpHelperEQ(lhs_expression, rhs_expression, lhs, rhs);
           ^
/data/llvm-project/lldb/unittests/Target/RegisterFlagsTest.cpp:128:3: note: in instantiation of function template specialization 'testing::internal::EqHelper::Compare<unsigned long long, int, nullptr>' requested here
  ASSERT_EQ(0x12345678ULL, rf.ReverseFieldOrder(0x12345678));
  ^
/data/llvm-project/third-party/unittest/googletest/include/gtest/gtest.h:2056:32: note: expanded from macro 'ASSERT_EQ'
                        ...

This reverts commit 17a4fcec.

The patch supports vector strict_fsetcc/fsetccs. Instead of revserving fflags,
the method to implement scalar quiet compares, the patch implement quiet
compares by masking the signaling compares when either input is NaN [0].

[0]: https://github.com/riscv/riscv-v-spec/blob/master/v-spec.adoc#vector-floating-point-compare-instructions

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D147998

Update descriptor generation to correctly set the `type` field for
REAL(3) and COMPLEX(3) objects.