J/JAL/JALX/JALS are absolute branches, but stay within the current
256 MB-aligned region, so we must include the high bits of the
instruction address when calculating the branch target.

Patch by James Clarke.

Differential Revision: https://reviews.llvm.org/D68548

llvm-svn: 373906

The static analyzer is warning about potential null dereferences, but in these cases we should be able to use castAs<> directly and if not assert will fire for us.

llvm-svn: 373905

The static analyzer is warning about potential null dereferences, but in these cases we should be able to use castAs<> directly and if not assert will fire for us.

llvm-svn: 373904

Summary: The C API doesn't have the bindings to create macro debug information.

Reviewers: whitequark, CodaFi, deadalnix

Reviewed By: whitequark

Subscribers: aprantl, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D58334

llvm-svn: 373903

Differential Revision:	https://reviews.llvm.org/D64746

llvm-svn: 373902

Fix comment.

llvm-svn: 373901

Earlier in the year intrinsics for lrint, llrint, lround and llround were
added to llvm. The constrained versions are now implemented here.

Reviewed by:	andrew.w.kaylor, craig.topper, cameron.mcinally
Approved by:	craig.topper
Differential Revision:	https://reviews.llvm.org/D64746

llvm-svn: 373900

The CMake build uses "x86_64-pc-windows-msvc". The "-msvc" suffix is
important because e.g. clang/test/lit.cfg.py matches against the
suffix "windows-msvc" to compute the presence of the "ms-sdk" and
the absence of the "LP64" feature.

Differential Revision: https://reviews.llvm.org/D68572

llvm-svn: 373899

It broke MC/AsmParser/directive_ascii.s on all bots:

    Assertion failed: (Index < Length && "Invalid index!"), function operator[],
        file ../../llvm/include/llvm/ADT/StringRef.h, line 243.

llvm-svn: 373898

Summary: Also fixes a potential user-after-scope issue of "Path".

Reviewers: kadircet

Subscribers: ilya-biryukov, MaskRay, jkorous, arphaman, usaxena95, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D68564

llvm-svn: 373897

RedeclChainShouldBeCorrectAmongstNamespaces

llvm-svn: 373896

llvm-svn: 373895

llvm-svn: 373894

The GFX10-DENORM-STRICT checks were only passing by accident. Fix them
to make the test more robust in the face of scheduling or register
allocation changes.

llvm-svn: 373893

Summary:
This fixes cases like:
  foo.h
    class Undocumented{}
  bar.h
    // break an include cycle. we should refactor this!
    class Undocumented;
Where the comment doesn't describe the class.

Note that a forward decl that is *visible to the definition* will still have
its doc comment used, by SymbolCollector: Merge isn't involved here.

Reviewers: ilya-biryukov

Subscribers: MaskRay, jkorous, arphaman, kadircet, usaxena95, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D68467

llvm-svn: 373892

Summary:
If the .symtab section is stripped from the binary it might be that
there's a .gnu_debugdata section which contains a smaller .symtab in
order to provide enough information to create a backtrace with function
names or to set and hit a breakpoint on a function name.

This change looks for a .gnu_debugdata section in the ELF object file.
The .gnu_debugdata section contains a xz-compressed ELF file with a
.symtab section inside. Symbols from that compressed .symtab section
are merged with the main object file's .dynsym symbols (if any).
In addition we always load the .dynsym even if there's a .symtab
section.

For example, the Fedora and RHEL operating systems strip their binaries
but keep a .gnu_debugdata section. While gdb already can read this
section, LLDB until this patch couldn't. To test this patch on a
Fedora or RHEL operating system, try to set a breakpoint on the "help"
symbol in the "zip" binary. Before this patch, only GDB can set this
breakpoint; now LLDB also can do so without installing extra debug
symbols:

    lldb /usr/bin/zip -b -o "b help" -o "r" -o "bt" -- -h

The above line runs LLDB in batch mode and on the "/usr/bin/zip -h"
target:

    (lldb) target create "/usr/bin/zip"
    Current executable set to '/usr/bin/zip' (x86_64).
    (lldb) settings set -- target.run-args  "-h"

Before the program starts, we set a breakpoint on the "help" symbol:

    (lldb) b help
    Breakpoint 1: where = zip`help, address = 0x00000000004093b0

Once the program is run and has hit the breakpoint we ask for a
backtrace:

    (lldb) r
    Process 10073 stopped
    * thread #1, name = 'zip', stop reason = breakpoint 1.1
        frame #0: 0x00000000004093b0 zip`help
    zip`help:
    ->  0x4093b0 <+0>:  pushq  %r12
        0x4093b2 <+2>:  movq   0x2af5f(%rip), %rsi       ;  + 4056
        0x4093b9 <+9>:  movl   $0x1, %edi
        0x4093be <+14>: xorl   %eax, %eax

    Process 10073 launched: '/usr/bin/zip' (x86_64)
    (lldb) bt
    * thread #1, name = 'zip', stop reason = breakpoint 1.1
      * frame #0: 0x00000000004093b0 zip`help
        frame #1: 0x0000000000403970 zip`main + 3248
        frame #2: 0x00007ffff7d8bf33 libc.so.6`__libc_start_main + 243
        frame #3: 0x0000000000408cee zip`_start + 46

In order to support the .gnu_debugdata section, one has to have LZMA
development headers installed. The CMake section, that controls this
part looks for the LZMA headers and enables .gnu_debugdata support by
default if they are found; otherwise or if explicitly requested, the
minidebuginfo support is disabled.

GDB supports the "mini debuginfo" section .gnu_debugdata since v7.6
(2013).

Reviewers: espindola, labath, jankratochvil, alexshap

Reviewed By: labath

Subscribers: rnkovacs, wuzish, shafik, emaste, mgorny, arichardson, hiraditya, MaskRay, lldb-commits

Tags: #lldb, #llvm

Differential Revision: https://reviews.llvm.org/D66791

llvm-svn: 373891

[llvm-readelf/llvm-objdump] - Improve/refactor the implementation of SHT_LLVM_ADDRSIG section dumping.

This patch:

* Adds a llvm-readobj/llvm-readelf test file for SHT_LLVM_ADDRSIG sections. (we do not have any)
* Enables dumping of SHT_LLVM_ADDRSIG with --all.
* Changes the logic to report a warning instead of an error when something goes wrong during dumping
  (allows to continue dumping SHT_LLVM_ADDRSIG and other sections on error).
* Refactors a piece of logic to a new toULEB128Array helper which might be used for GNU-style
  dumping implementation.

Differential revision: https://reviews.llvm.org/D68383

llvm-svn: 373890

Summary: Semantic highlghting is missing a few macro references.

Reviewers: ilya-biryukov

Subscribers: MaskRay, jkorous, arphaman, kadircet, usaxena95, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D68458

llvm-svn: 373889

Summary:
Implement support for hexadecimal escape sequences to match how GNU 'as'
handles them. I.e., read all hexadecimal characters and truncate to the
lower 16 bits.

Reviewers: nickdesaulniers

Subscribers: hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D68483

llvm-svn: 373888

These were added to the MS docs in
https://github.com/MicrosoftDocs/cpp-docs/commit/85b9b6967e58e485251450f7451673f6fc873e88
and are supposedly available in VS 2019 16.4 (though my 2019 Preview,
version 16.4.0-pre.1.0 don't seem to have them.)

llvm-svn: 373887

Depends on D68561.

llvm-svn: 373886

This makes it clear `ELF/**/*.cpp` files define things in the `lld::elf`
namespace and simplifies `elf::foo` to `foo`.

Reviewed By: atanasyan, grimar, ruiu

Differential Revision: https://reviews.llvm.org/D68323

llvm-svn: 373885

This allows us to delete `using namespace llvm::support::endian` and
simplify D68323. This change adds runtime config->endianness check but
the overhead should be negligible.

Reviewed By: ruiu

Differential Revision: https://reviews.llvm.org/D68561

llvm-svn: 373884

Followup to a previous pacification, this performs the same workaround
to the TableGen generated code for tuple automata.

llvm-svn: 373883

This reverts SVN r373833, as it caused a failed assert "Non-zero loop
cost expected" on building numerous projects, see PR43582 for details
and reproduction samples.

llvm-svn: 373882

llvm-svn: 373880

llvm-svn: 373878

Move the erasing and iterator updating inside to match the
other slow LEA function.

I've adapted code from optTwoAddrLEA and basically rebuilt the
implementation here. We do lose the kill flags now just like
optTwoAddrLEA. This runs late enough in the pipeline that
shouldn't really be a problem.

llvm-svn: 373877

llvm-svn: 373876

object of class type with a virtual destructor.

llvm-svn: 373875

same.

We were missing the lvalue-to-rvalue conversion entirely in this case,
and in fact still need the full CK_LValueToRValueBitCast conversion to
perform a load with no TBAA.

llvm-svn: 373874

llvm-svn: 373873

Removes Subsystem Documentation page. Also moves existing topics on Subsystem Documentation page to User Guides and Reference pages.

llvm-svn: 373872

If a fp scalar is loaded and then used as both a scalar and a vector broadcast, perform the load as a broadcast and then extract the scalar for 'free' from the 0th element.

This involved switching the order of the X86ISD::BROADCAST combines so we only convert to X86ISD::BROADCAST_LOAD once all other canonicalizations have been attempted.

Adds a DAGCombinerInfo::recursivelyDeleteUnusedNodes wrapper.

Fixes PR43217

Differential Revision: https://reviews.llvm.org/D68544

llvm-svn: 373871

llvm-svn: 373870

This is patch aims to group together the `CRNotPat` multi class instantiations
within the `PPCInstrInfo.td` file.

Integer instantiations of the multi class are grouped together into a section,
and the floating point patterns are separated into its own section.

Differential Revision: https://reviews.llvm.org/D67975

llvm-svn: 373869

Move the resolveTargetShuffleInputsAndMask call to after the shuffle mask combine before the undef/zero constant fold instead.

llvm-svn: 373868

Replaces setTargetShuffleZeroElements with getTargetShuffleAndZeroables which reports the Zeroable elements but doesn't merge them into the decoded target shuffle mask (the merging has been moved up into getTargetShuffleInputs until we can get rid of it entirely).

This is part of the work to fix PR43024 and allow us to use SimplifyDemandedElts to simplify shuffle chains - we need to get to a point where the target shuffle mask isn't adjusted by its source inputs but instead we cache them in a parallel Zeroable mask.

llvm-svn: 373867

Summary:
The overload resolution for enums with a fixed underlying type has changed in the C++14 standard. This patch implements the new rule.

Patch by Mark de Wever!

Reviewers: rsmith

Reviewed By: rsmith

Subscribers: cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D65695

llvm-svn: 373866

[X86] Add custom type legalization for v16i64->v16i8 truncate and v8i64->v8i8 truncate when v8i64 isn't legal

Summary:
The default legalization for v16i64->v16i8 tries to create a multiple stage truncate concatenating after each stage and truncating again. But avx512 implements truncates with multiple uops. So it should be better to truncate all the way to the desired element size and then concatenate the pieces using unpckl instructions. This minimizes the number of 2 uop truncates. The unpcks are all single uop instructions.

I tried to handle this by just custom splitting the v16i64->v16i8 shuffle. And hoped that the DAG combiner would leave the two halves in the state needed to make D68374 do the job for each half. This worked for the first half, but the second half got messed up. So I've implemented custom handling for v8i64->v8i8 when v8i64 needs to be split to produce the VTRUNCs directly.

Reviewers: RKSimon, spatel

Reviewed By: RKSimon

Subscribers: hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D68428

llvm-svn: 373864