Summary:
/PDBSTREAM:<name>=<file> adds the contents of <file> to stream <name> in the resulting PDB.

This allows native uses with workflows that (for example) add srcsrv streams to PDB files to provide a location for the build's source files.

Results should be equivalent to linking with lld-link, then running Microsoft's pdbstr tool with the command line:
pdbstr.exe -w -p:<PDB LOCATION> -s:<name> -i:<file>
except in cases where the named stream overlaps with a default named stream, such as "/names". In those cases, the added stream will be overridden, making the /pdbstream option a no-op.

Reviewers: thakis, rnk

Reviewed By: thakis

Differential Revision: https://reviews.llvm.org/D77310

Instead of creating a temporary directory inside /tmp and running the
tests there, use a directory name based on LIT's %t substitution. This
has the benefit of not hitting /tmp so much (which is slow on some
filesystems). It also has the benefit that `ninja -C build clean` will
automatically remove the artifacts even if a test somehow failed to
remove its temporary directory (I've seen this happen when CTRL-C is
received).

__strlen_chk returns a `size_t`, not a `char *`.

This reverts commit e3ba652a.

Summary: Diagnostics may be cached in the parallel diagnostic handler to preserve proper ordering. Storing the Operation as a DiagnosticArgument is problematic as the operation may be erased or changed before it finally gets printed.

Differential Revision: https://reviews.llvm.org/D77675

Discussed on lldb-dev with Pavel Labath. This doesn't work for
background processes [causes Python to be stuck forever], and it's
unclear whether it's needed. There's no test, also. If this turns
out to be useful, it can be recommitted with a functional implementation
and a test.

This reverts commit 97aa593a as it
causes problems (PR45453) https://reviews.llvm.org/D77574#1966321.

This additionally adds an explicit reference to FrontendOpenMP to
clang-tidy where ASTMatchers is used.

This is hopefully just a temporary solution. The dependence on
`FrontendOpenMP` from `ASTMatchers` should be handled by CMake
implicitly, not us explicitly.

Reviewed By: aheejin

Differential Revision: https://reviews.llvm.org/D77666

Implemented codegen for the iterator expression in the depend clauses.
Iterator construct is emitted the following way:
iterator(cnt1, cnt2, ...), in : <dep>

<TotalNumDeps> = <cnt1_size> * <cnt2_size> * ...;
kmp_depend_t deps[<TotalNumDeps>];
deps_counter = 0;
for (cnt1) {
  for (cnt2) {
    ...
    deps[deps_counter].base_addr = &<dep>;
    deps[deps_counter].size = sizeof(<dep>);
    deps[deps_counter].flags = in;
    deps_counter += 1;
    ...
  }
}

For depobj construct the codegen is very similar, but the memory is
allocated dynamically and added extra first item reserved for internal use.

The common profile usage is to collect profile from a target and then use the profile to guide the optimized build for the same target. There are some cases that no profile can be collected for a target. In those cases, although no full profile is available, it is possible to have some partial profile collected from other targets to optimize common libraries and utilities. A flag is needed to tell the partial profile from the full profile apart, so compiler can use different strategy for them.

Differential Revision: https://reviews.llvm.org/D77426

There are a few patterns where we use a superclass for inputs to this
instruction rather than the correct class. This can sometimes lead to
unncessary copies.

Summary: Change all checks that take enums as configuration to use enum specific methods in `ClangTidyCheck::OptionsView`.

Reviewers: aaron.ballman, alexfh

Reviewed By: aaron.ballman

Subscribers: wuzish, nemanjai, kbarton, arphaman, xazax.hun, cfe-commits

Tags: #clang, #clang-tools-extra

Differential Revision: https://reviews.llvm.org/D76606

[OpenMP] Optimized stream selection by scheduling data mapping for the same target region into a same stream

Summary:
This patch introduces two things for offloading:
1. Asynchronous data transferring: those functions are suffix with `_async`. They have one more argument compared with their synchronous counterparts: `__tgt_async_info*`, which is a new struct that only has one field, `void *Identifier`. This struct is for information exchange between different asynchronous operations. It can be used for stream selection, like in this case, or operation synchronization, which is also used. We may expect more usages in the future.
2. Optimization of stream selection for data mapping. Previous implementation was using asynchronous device memory transfer but synchronizing after each memory transfer. Actually, if we say kernel A needs four memory copy to device and two memory copy back to host, then we can schedule these seven operations (four H2D, two D2H, and one kernel launch) into a same stream and just nee...

Summary:
Adds support for `ClangTidyCheck::OptionsView` to deteremine:
  - If an option is found in the configuration.
  - If an integer option read from configuration is parsable to an integer.
  - Parse and Serialize enum configuration options directly using a mapping from `llvm::StringRef` to `EnumType`.
  - If an integer or enum option isn't parseable but there is a default value it will issue a warning to stderr that the config value hasn't been used.
  - If an enum option isn't parsable it can provide a hint if the value was a typo.

Reviewers: aaron.ballman, alexfh, gribozavr2

Reviewed By: aaron.ballman

Subscribers: xazax.hun, cfe-commits

Tags: #clang, #clang-tools-extra

Differential Revision: https://reviews.llvm.org/D77085

Update the sysroot expectation to match other targets and breakout
linux/musl toolchain tests into a new file.

Differential Revision: https://reviews.llvm.org/D77440

WG14 has adopted N2480 (http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2480.pdf)
into C2x at the meetings last week, allowing parameter names of a function
definition to be elided. This patch relaxes the error so that C++ and C2x do not
diagnose this situation, and modes before C2x will allow it as an extension.

This also adds the same feature to ObjC blocks under the assumption that ObjC
wishes to follow the C standard in this regard.

This allows both the old and the new testing formats to handle these
tests with modules enabled.

We also include the modules flags in the %{flags} substitution, which
means that .sh.cpp tests in the old format and all tests in the new
format will use modules flags when enabled.

This patch extends existing constant folding in logical operations to
handle S_XNOR, S_NAND, S_NOR, S_ANDN2, S_ORN2, V_LSHL_ADD_U32 and
V_AND_OR_B32. Also added a couple of tests for existing folds.

This removes a call to getScalarType from a bunch of call sites.
It also makes the behavior consistent with SIGN_EXTEND_INREG.

Differential Revision: https://reviews.llvm.org/D77631

For implementing "remove obsolete debug info in lld", it is neccesary
to have DWARF generation code implementation. dsymutil uses DwarfStreamer
for that purpose. DwarfStreamer uses AsmPrinter. It is considered OK
to use AsmPrinter based code in lld(D74169). This patch moves
DwarfStreamer implementation into DWARFLinker, so that it could be reused
from lld.

Generally, a better place for such a common DWARF generation code would be
not DWARFLinker but an additional separate library. Such a library could
contain a single version of DWARF generation routines and could also
be independent of AsmPrinter. At the current moment, DwarfStreamer
does not pretend to be such a general implementation of DWARF generation.
So I decided to put it into DWARFLinker since it is the only user
of DwarfStreamer.

Testing: it passes "check-all" lit testing. MD5 checksum for clang .dSYM
bundle matches for the dsymutil with/without that patch.

Reviewed By: JDevlieghere

Differential revision: https://reviews.llvm.org/D77169

This reverts commit 21efb06f.

Changes since last attempt to land this patch:
- Sort files before deduplicating. This hopefully avoids some buildbot failures.
- Fix use of uninitialized variable when running without --use-analyzer.
- Remove the "REQUIRES: windows" item.

7aecf232 fixed the bug where we would miscompile, but we still generate
a crazy amount of code. Turn off the expansion until someone implements
an appropriate heuristic.

Differential Revision: https://reviews.llvm.org/D77599

Summary: Fixes: https://bugs.llvm.org/show_bug.cgi?id=45452

Subscribers: dschuff, jgravelle-google, hiraditya, aheejin, sunfish, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D77627

We can only collapse adjacent SI_END_CF if outer statement
belongs to a simple SI_IF, otherwise correct mask is not in the
register we expect, but is an argument of an S_XOR instruction.

Even if SI_IF is simple it might be lowered using S_XOR because
lowering is dependent on a basic block layout. It is not
considered simple if instruction consuming its output is
not an SI_END_CF. Since that SI_END_CF might have already been
lowered to an S_OR isSimpleIf() check may return false.

This situation is an opportunity for a further optimization
of SI_IF lowering, but that is a separate optimization. In the
meanwhile move SI_END_CF post the lowering when we already know
how the rest of the CFG was lowered since a non-simple SI_IF
case still needs to be handled.

Differential Revision: https://reviews.llvm.org/D77610

This is an alternative design to D77512.

D45195 added --warn-backrefs to detect

* A. certain input orders which GNU ld either errors ("undefined reference")
  or has different resolution semantics
* B. (byproduct) some latent multiple definition problems (-ldef1 -lref -ldef2) which I
  call "linking sandwich problems". def2 may or may not be the same as def1.

When an archive appears more than once (-ldef -lref -ldef), lld and GNU
ld may have the same resolution but --warn-backrefs may warn. This is
not uncommon. For example, currently lld itself has such a problem:

```
liblldCommon.a liblldCOFF.a ... liblldCommon.a
  _ZN3lld10DWARFCache13getDILineInfoEmm in liblldCOFF.a refers to liblldCommon.a(DWARF.cpp.o)
libLLVMSupport.a also appears twice and has a similar warning
```

glibc has such problems. It is somewhat destined because of its separate
libc/libpthread/... and arbitrary grouping. The situation is getting
improved over time but I have seen:
```
-lc __isnanl references -lm
-lc _IO_funlockfile references -lpthread
```

There are also various issues in interaction with other runtime
libraries such as libgcc_eh and libunwind:
```
-lc __gcc_personality_v0 references -lgcc_eh
-lpthread __gcc_personality_v0 references -lgcc_eh
-lpthread _Unwind_GetCFA references -lunwind
```

These problems are actually benign. We want --warn-backrefs to focus on
its main task A and defer task B (which is also useful) to a more
specific future feature (see gold --detect-odr-violations and
https://bugs.llvm.org/show_bug.cgi?id=43110).

Instead of warning immediately, we store the message and only report it
if no subsequent lazy definition exists.

The use of the static variable `backrefDiags` is similar to `undefs` in
Relocations.cpp

Reviewed By: grimar

Differential Revision: https://reviews.llvm.org/D77522

SymbolAssignment::addr stores the location counter. The type should be
uint64_t instead of unsigned. The upper half of the address space is
commonly used by operating system kernels.

Similarly, SymbolAssignment::size should be an uint64_t. A kernel linker
script can move the location counter from 0 to the upper half of the
address space.

Reviewed By: grimar

Differential Revision: https://reviews.llvm.org/D77445

If we have two back-to-back loops with block arguments, the OpPhi
instructions generated for the second loop's block arguments should
have use the merge block of the first SPIR-V loop structure as
their incoming parent block.

Differential Revision: https://reviews.llvm.org/D77543

createLowerToLLVMPass() now requires a struct for passing in arguments
after 7023f4b4.

These should not be assuming address space 0. Calling getPointerTy is
generally the wrong thing to do, since you should already know the
type from the incoming IR.

The change in bcf6604 added a debug info flag, which caused some tests
to fail; I removed some commas so that the test matching still works.

Summary:
This change adds DIFlagNonTrivial to forward declarations of
DICompositeType. It adds the flag to nontrivial types and types with
unknown triviality.

It fixes adding the "CxxReturnUdt" flag to functions inconsistently,
since it is added based on whether the return type is marked NonTrivial, and
that changes if the return type was a forward declaration.

continues the discussion at https://reviews.llvm.org/D75215

Bug: https://bugs.llvm.org/show_bug.cgi?id=44785

Reviewers: rnk, dblaikie, aprantl

Subscribers: cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D77436

RDA sometimes needs to visit blocks twice, to take into account
reaching defs coming in along loop back edges. Currently it handles
repeated visitation the same way as usual, which means that it will
scan through all instructions and their reg unit defs again. Not
only is this very inefficient, it also means that all reaching defs
in loops are going to be inserted twice.

We can do much better than this. The only thing we need to handle
is a new reaching def from a predecessor, which either needs to be
prepended to the reaching definitions (if there was no reaching def
from a predecessor), or needs to replace an existing predecessor
reaching def, if it is more recent. Since D77508 we only store the
most recent predecessor reaching def, so that's the only one that
may need updating.

This also has the nice side-effect that reaching definitions are
now automatically sorted and unique, so drop the llvm::sort() call
in favor of an assertion.

Differential Revision: https://reviews.llvm.org/D77511