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Reverting r277058, while I fugure out why it broke internal bots.

This reverts commit e514ffa8.

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This means that a function marked with an availability attribute can safely
refer to a declaration that is greater than the deployment target, but less then
or equal to the context availability without -Wpartial-availability firing.

Differential revision: https://reviews.llvm.org/D22697

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Fix the explanation of how to run tests after migration
from autotools to cmake.

Significantly expand the "debugging" section
with more interesting stuff.

Update the table of contents accordingly.

Fix paragraphs in the overview section.

Differential Revision: https://reviews.llvm.org/D22874


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Currently Clang use int32 to represent sampler_t, which have been a source of issue for some backends, because in some backends sampler_t cannot be represented by int32. They have to depend on kernel argument metadata and use IPA to find the sampler arguments and global variables and transform them to target specific sampler type.

This patch uses opaque pointer type opencl.sampler_t* for sampler_t. For each use of file-scope sampler variable, it generates a function call of __translate_sampler_initializer. For each initialization of function-scope sampler variable, it generates a function call of __translate_sampler_initializer.

Each builtin library can implement its own __translate_sampler_initializer(). Since the real sampler type tends to be architecture dependent, allowing it to be initialized by a library function simplifies backend design. A typical implementation of __translate_sampler_initializer could be a table lookup of real sampler literal values. Since its argument is always a literal, the returned pointer is known at compile time and easily optimized to finally become some literal values directly put into image read instructions.

This patch is partially based on Alexey Sotkin's work in Khronos Clang (https://github.com/KhronosGroup/SPIR/commit/3d4eec61623502fc306e8c67c9868be2b136e42b).

Differential Revision: https://reviews.llvm.org/D21567

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Buildbot failures when building with clang -Werror. Reverting while I try to
figure this out.


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This fixes a couple of bugs in Windows SDK Detection.

1. `readFullStringValue` returns a bool, but was being compared
   with ERROR_SUCCESS.
2. `RegQueryValueExW` might return the null terminator in the
   queried value which will result in incorrect values being
   returned from `getSystemRegistryString`.

Patch By: comicfans44@gmail.com
Reviewed By: zturner
Differential Revision: http://reviews.llvm.org/D21946

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This attempts to fix a failure in Windows bots pottentially related with a reserved keyword.


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It was causing a few bots to fail.



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Windows bots were complaining about that.



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Summary:
This patch prevents OpenMP flags from being forwarded to CUDA device commands. That was causing the CUDA frontend to attempt to emit OpenMP code which is not supported.

This fixes the bug reported in https://llvm.org/bugs/show_bug.cgi?id=28723.

Reviewers: hfinkel, carlo.bertolli, arpith-jacob, kkwli0, tra, ABataev

Subscribers: caomhin, cfe-commits

Differential Revision: https://reviews.llvm.org/D22895

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Summary: This patch adds support for the is_device_ptr clause. It expands SEMA to use the mappable expression logic that can only be tested with code generation in place and check conflicts with other data sharing related clauses using the mappable expressions infrastructure.

Reviewers: hfinkel, carlo.bertolli, arpith-jacob, kkwli0, ABataev

Subscribers: caomhin, cfe-commits

Differential Revision: https://reviews.llvm.org/D22788

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Summary: This patch adds support for the use_device_ptr clause. It includes changes in SEMA that could not be tested without codegen, namely, the use of the first private logic and mappable expressions support.

Reviewers: hfinkel, carlo.bertolli, arpith-jacob, kkwli0, ABataev

Subscribers: caomhin, cfe-commits

Differential Revision: https://reviews.llvm.org/D22691

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This version has two fixes compared to the original:
 * In Registry.h the template static members are instantiated before they are
   used, as clang gives an error if you do it the other way around.
 * The use of the Registry template in clang-tidy is updated in the same way as
   has been done everywhere else.

Original commit message:

Currently the Registry class contains the vestiges of a previous attempt to
allow plugins to be used on Windows without using BUILD_SHARED_LIBS, where a
plugin would have its own copy of a registry and export it to be imported by
the tool that's loading the plugin. This only works if the plugin is entirely
self-contained with the only interface between the plugin and tool being the
registry, and in particular this conflicts with how IR pass plugins work.

This patch changes things so that instead the add_node function of the registry
is exported by the tool and then imported by the plugin, which solves this
problem and also means that instead of every plugin having to export every
registry they use instead LLVM only has to export the add_node functions. This
allows plugins that use a registry to work on Windows if
LLVM_EXPORT_SYMBOLS_FOR_PLUGINS is used.


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This resubmit r270688 which broke some specific buildbots.That's because
there is incorrect indexing problem in the targetparser,and the problem is
fixed in r276957.

Differential Revision: https://reviews.llvm.org/D21277

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This was an oversight from when I added BeginFunction support in r261293.

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Compute an effective triple once per job. Cache the triple in the
prevailing ToolChain for the duration of the job.

Clients which need effective triples now look them up in the ToolChain.
This eliminates wasteful re-computation of effective triples (e.g in
getARMFloatABI()).

While we're at it, delete MachO::ComputeEffectiveClangTriple. It was a
no-op override.

Differential Revision: https://reviews.llvm.org/D22596

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This reverts commit r275895 in order to address some post-commit review
feedback from Eric Christopher (see: the list thread for r275895).

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Summary: This patch add support to map pointers through references in class members. Although a reference does not have storage that a user can access, it still has to be mapped in order to get the deep copy right and the dereferencing code work properly.

Reviewers: hfinkel, carlo.bertolli, arpith-jacob, kkwli0, ABataev

Subscribers: caomhin, cfe-commits

Differential Revision: https://reviews.llvm.org/D22787

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Summary:
This patch fixes a bug in the map of array sections whose base is a reference to a pointer. The existing mapping support was not prepared to deal with it, causing the compiler to crash.

Mapping a reference to a pointer enjoys the same characteristics of a regular pointer, i.e., it is passed by value. Therefore, the reference has to be materialized in the target region.

Reviewers: hfinkel, carlo.bertolli, kkwli0, ABataev

Subscribers: caomhin, cfe-commits

Differential Revision: https://reviews.llvm.org/D22690

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Having 1 entry per line and an alphabetical order is clearer and reduces
the risk of invalid merges.

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Nothing else checked the target cpu names for aarch64 yet.
Add a test in the spirit of x86-target-cpu.c.

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Summary:
This patch aims at removing redundancy in the way include paths for the regular and offloading toolchains are appended to the arguments list in the clang tool.

This was suggested by @rsmith in response to r275931.

Reviewers: rsmith, tra

Subscribers: rsmith, cfe-commits

Differential Revision: https://reviews.llvm.org/D22518

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[CUDA] Align kernel launch args correctly when the LLVM type's alignment is different from the clang type's alignment.

Summary:
Before this patch, we computed the offsets in memory of args passed to
GPU kernel functions by throwing all of the args into an LLVM struct.

clang emits packed llvm structs basically whenever it feels like it, and
packed structs have alignment 1.  So we cannot rely on the llvm type's
alignment matching the C++ type's alignment.

This patch fixes our codegen so we always respect the clang types'
alignments.

Reviewers: rnk

Subscribers: cfe-commits, tra

Differential Revision: https://reviews.llvm.org/D22879

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Summary:
Previously this crashed inside EmitThisParam().  There should be no
prelude for naked functions, so just skip the whole thing.

Reviewers: majnemer

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D22715

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Summary: Add -fpreserve-as-comments and -fno-preserve-as-comments.

Reviewers: echristo, rnk

Subscribers: mehdi_amini, llvm-commits

Differential Revision: https://reviews.llvm.org/D22883

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Summary:
In RenderScript, the size of the argument or return value emitted in the
IR is expected to be the same as the size of corresponding qualified
type.  For ARM and AArch64, the coercion performed by Clang can
change the parameter or return value to a type whose size is different
(usually larger) than the original aggregate type.  Specifically, this
can happen in the following cases:
    - Aggregate parameters of size <= 64 bytes and return values smaller
      than 4 bytes on ARM
    - Aggregate parameters and return values smaller than bytes on
      AArch64

This patch coerces the cases above to an integer array that is the same
size and alignment as the original aggregate.  A new field is added to
TargetInfo to detect a RenderScript target and limit this coercion just
to that case.

Tests added to test/CodeGen/renderscript.c

Reviewers: rsmith

Subscribers: aemerson, srhines, llvm-commits

Differential Revision: https://reviews.llvm.org/D22822

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Fixes PR27994, a crash on valid.

Differential revision: https://reviews.llvm.org/D21145

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Patch by Cristina Cristescu and Axel Naumann!

Agreed on post commit review (D17820).


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