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FMV priority is the returned value of a polymorphic function. On RISC-V
and X86 targets a 32-bit value is enough. On AArch64 we currently need
64 bits and we will soon exceed that. APInt seems to be a suitable
replacement for uint64_t, presumably with minimal compile time overhead.
It allows bit manipulation, comparison and variable bit width.
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Remove the Native Client support now that it has finally reached end of life.
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This PR introduces the use of pointer authentication to objective-c[++].
This includes:
* __ptrauth qualifier support for ivars
* protection of isa and super fields
* protection of SEL typed ivars
* protection of class_ro_t data
* protection of methodlist pointers and content
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https://reviews.llvm.org/D104808 set the alignment of long double to 64
bits. This is also the alignment specified in the LLVM data layout.
However, the alignment of __float128 was left at 128 bits.
I assume that this was just an oversight, rather than an intentional
divergence. The C ABI document currently does not make any statement
about `__float128`:
https://github.com/WebAssembly/tool-conventions/blob/main/BasicCABI.md
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Verify that the alignments specified by clang TargetInfo match the
alignments specified by LLVM data layout, which will hopefully prevent
accidental mismatches in the future.
This currently contains opt-outs for a number of of existing mismatches.
I'm also skipping the verification if options like `-malign-double` are
used, or a language that mandates sizes/alignments that differ from C.
The verification happens in CodeGen, as we can't have an IR dependency
in Basic.
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(This is a re-do of #138972, which had a minor warning in `Clang.cpp`.)
This PR adds some of the support needed for Windows hot-patching.
Windows implements a form of hot-patching. This allows patches to be
applied to Windows apps, drivers, and the kernel, without rebooting or
restarting any of these components. Hot-patching is a complex technology
and requires coordination between the OS, compilers, linkers, and
additional tools.
This PR adds support to Clang and LLVM for part of the hot-patching
process. It enables LLVM to generate the required code changes and to
generate CodeView symbols which identify hot-patched functions. The PR
provides new command-line arguments to Clang which allow developers to
identify the list of functions that need to be hot-patched. This PR also
allows LLVM to directly receive the list of functions to be modified, so
that language front-ends which have not yet been modified (such as Rust)
can still make use of hot-patching.
This PR:
* Adds a `MarkedForWindowsHotPatching` LLVM function attribute. This
attribute indicates that a function should be _hot-patched_. This
generates a new CodeView symbol, `S_HOTPATCHFUNC`, which identifies any
function that has been hot-patched. This attribute also causes accesses
to global variables to be indirected through a `_ref_*` global variable.
This allows hot-patched functions to access the correct version of a
global variable; the hot-patched code needs to access the variable in
the _original_ image, not the patch image.
* Adds a `AllowDirectAccessInHotPatchFunction` LLVM attribute. This
attribute may be placed on global variable declarations. It indicates
that the variable may be safely accessed without the `_ref_*`
indirection.
* Adds two Clang command-line parameters: `-fms-hotpatch-functions-file`
and `-fms-hotpatch-functions-list`. The `-file` flag may point to a text
file, which contains a list of functions to be hot-patched (one function
name per line). The `-list` flag simply directly identifies functions to
be patched, using a comma-separated list. These two command-line
parameters may also be combined; the final set of functions to be
hot-patched is the union of the two sets.
* Adds similar LLVM command-line parameters:
`--ms-hotpatch-functions-file` and `--ms-hotpatch-functions-list`.
* Adds integration tests for both LLVM and Clang.
* Adds support for dumping the new `S_HOTPATCHFUNC` CodeView symbol.
Although the flags are redundant between Clang and LLVM, this allows
additional languages (such as Rust) to take advantage of hot-patching
support before they have been modified to generate the required
attributes.
Credit to @dpaoliello, who wrote the original form of this patch.
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Reverts llvm/llvm-project#138972
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This PR adds some of the support needed for Windows hot-patching.
Windows implements a form of hot-patching. This allows patches to be
applied to Windows apps, drivers, and the kernel, without rebooting or
restarting any of these components. Hot-patching is a complex technology
and requires coordination between the OS, compilers, linkers, and
additional tools.
This PR adds support to Clang and LLVM for part of the hot-patching
process. It enables LLVM to generate the required code changes and to
generate CodeView symbols which identify hot-patched functions. The PR
provides new command-line arguments to Clang which allow developers to
identify the list of functions that need to be hot-patched. This PR also
allows LLVM to directly receive the list of functions to be modified, so
that language front-ends which have not yet been modified (such as Rust)
can still make use of hot-patching.
This PR:
* Adds a `MarkedForWindowsHotPatching` LLVM function attribute. This
attribute indicates that a function should be _hot-patched_. This
generates a new CodeView symbol, `S_HOTPATCHFUNC`, which identifies any
function that has been hot-patched. This attribute also causes accesses
to global variables to be indirected through a `_ref_*` global variable.
This allows hot-patched functions to access the correct version of a
global variable; the hot-patched code needs to access the variable in
the _original_ image, not the patch image.
* Adds a `AllowDirectAccessInHotPatchFunction` LLVM attribute. This
attribute may be placed on global variable declarations. It indicates
that the variable may be safely accessed without the `_ref_*`
indirection.
* Adds two Clang command-line parameters: `-fms-hotpatch-functions-file`
and `-fms-hotpatch-functions-list`. The `-file` flag may point to a text
file, which contains a list of functions to be hot-patched (one function
name per line). The `-list` flag simply directly identifies functions to
be patched, using a comma-separated list. These two command-line
parameters may also be combined; the final set of functions to be
hot-patched is the union of the two sets.
* Adds similar LLVM command-line parameters:
`--ms-hotpatch-functions-file` and `--ms-hotpatch-functions-list`.
* Adds integration tests for both LLVM and Clang.
* Adds support for dumping the new `S_HOTPATCHFUNC` CodeView symbol.
Although the flags are redundant between Clang and LLVM, this allows
additional languages (such as Rust) to take advantage of hot-patching
support before they have been modified to generate the required
attributes.
Credit to @dpaoliello, who wrote the original form of this patch.
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Summary:
This is a weird point of divergence that was not updated when the new
driver
switched to using the CUID method, which is also apparently critical
for SPIR-V compilation not failing? Somehow if we don't emit this global
than the `llvm.compiler.used` global uses AS(0) which makes SPIR-V
unhappy, but with this global it's AS(4) which makes it happy. Either
way, this should be fixed.
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(equivalent to MSVC's /d2epilogunwindrequirev2) (#143577)
#129142 added support for emitting Windows x64 unwind v2 information,
but it was "best effort". If any function didn't follow the requirements
for v2 it was silently downgraded to v1.
There are some parts of Windows (specifically kernel-mode code running
on Xbox) that require v2, hence we need the ability to fail the
compilation if v2 can't be used.
This change also adds a heuristic to check if there might be too many
unwind codes, it's currently conservative (i.e., assumes that certain
prolog instructions will use the maximum number of unwind codes).
Future work: attempting to chain unwind info across multiple tables if
there are too many unwind codes due to epilogs and adding a heuristic to
detect if an epilog will be too far from the end of the function.
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Implements
https://github.com/llvm/wg-hlsl/blob/main/proposals/0026-symbol-visibility.md.
The change is to stop using the `hlsl.export` attribute. Instead,
symbols with "program linkage" in HLSL will have export linkage with
default visibility, and symbols with "external linkage" in HLSL will
have export linkage with hidden visibility.
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MSVC always emits minimal CodeView metadata with compiler information,
even when debug info is otherwise disabled. Other tools may rely on this
metadata being present. For example, linkers use it to determine whether
hotpatching is enabled for the object file.
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This PR resubmits the changes from #136098, which was previously
reverted due to a build failure during the linking stage:
```
undefined reference to `llvm::DebugInfoCorrelate'
undefined reference to `llvm::ProfileCorrelate'
```
The root cause was that `llvm/lib/Frontend/Driver/CodeGenOptions.cpp`
references symbols from the `Instrumentation` component, but the
`LINK_COMPONENTS` in the `llvm/lib/Frontend/CMakeLists.txt` for
`LLVMFrontendDriver` did not include it. As a result, linking failed in
configurations where these components were not transitively linked.
### Fix:
This updated patch explicitly adds `Instrumentation` to
`LINK_COMPONENTS` in the relevant `llvm/lib/Frontend/CMakeLists.txt`
file to ensure the required symbols are properly resolved.
---------
Co-authored-by: ict-ql <168183727+ict-ql@users.noreply.github.com>
Co-authored-by: Chyaka <52224511+liliumshade@users.noreply.github.com>
Co-authored-by: Tarun Prabhu <tarunprabhu@gmail.com>
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I previously failed to realize this feature existed...
Fixes #137459
Fixes #143242
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This option complements -funique-source-file-names and allows the user
to use a different unique identifier than the source file path.
Reviewers: teresajohnson
Reviewed By: teresajohnson
Pull Request: https://github.com/llvm/llvm-project/pull/142901
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We have multiple different attributes in clang representing device
kernels for specific targets/languages. Refactor them into one attribute
with different spellings to make it more easily scalable for new
languages/targets.
---------
Signed-off-by: Sarnie, Nick <nick.sarnie@intel.com>
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This variable attribute is used in HLSL to add Vulkan specific builtins
in a shader.
The attribute is documented here:
https://github.com/microsoft/hlsl-specs/blob/17727e88fd1cb09013cb3a144110826af05f4dd5/proposals/0011-inline-spirv.md
Those variable, even if marked as `static` are externally initialized by
the pipeline/driver/GPU. This is handled by moving them to a specific
address space `hlsl_input`, also added by this commit.
The design for input variables in Clang can be found here:
https://github.com/llvm/wg-hlsl/blob/355771361ef69259fef39a65caef8bff9cb4046d/proposals/0019-spirv-input-builtin.md
Co-authored-by: Justin Bogner <mail@justinbogner.com>
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(#141808)
With the current behavior the following example yields a linker error:
"multiple definition of `foo.default'"
// Translation Unit 1
__attribute__((target_clones("dotprod, sve"))) int foo(void) { return 1; }
// Translation Unit 2
int foo(void) { return 0; }
__attribute__((target_version("dotprod"))) int foo(void);
__attribute__((target_version("sve"))) int foo(void);
int bar(void) { return foo(); }
That is because foo.default is generated twice. As a user I don't find
this particularly intuitive. If I wanted the default to be generated in
TU1 I'd rather write target_clones("dotprod, sve", "default")
explicitly.
When changing the code I noticed that the RISC-V target defers the
resolver emission when encountering a target_version definition. This
seems accidental since it only makes sense for AArch64, where we only
emit a resolver once we've processed the entire TU, and only if the
default version is present. I've changed this so that RISC-V immediately
emmits the resolver. I adjusted the codegen tests since the functions
now appear in a different order.
Implements https://github.com/ARM-software/acle/pull/377
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compiler" (#142159)
Reverts llvm/llvm-project#136098
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(#136098)
This patch implements IR-based Profile-Guided Optimization support in
Flang through the following flags:
- `-fprofile-generate` for instrumentation-based profile generation
- `-fprofile-use=<dir>/file` for profile-guided optimization
Resolves #74216 (implements IR PGO support phase)
**Key changes:**
- Frontend flag handling aligned with Clang/GCC semantics
- Instrumentation hooks into LLVM PGO infrastructure
- LIT tests verifying:
- Instrumentation metadata generation
- Profile loading from specified path
- Branch weight attribution (IR checks)
**Tests:**
- Added gcc-flag-compatibility.f90 test module verifying:
- Flag parsing boundary conditions
- IR-level profile annotation consistency
- Profile input path normalization rules
- SPEC2006 benchmark results will be shared in comments
For details on LLVM's PGO framework, refer to [Clang PGO
Documentation](https://clang.llvm.org/docs/UsersManual.html#profile-guided-optimization).
This implementation was developed by [XSCC Compiler
Team](https://github.com/orgs/OpenXiangShan/teams/xscc).
---------
Co-authored-by: ict-ql <168183727+ict-ql@users.noreply.github.com>
Co-authored-by: Tom Eccles <t@freedommail.info>
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(#139821)
Recently in some of our internal testing, we noticed that the compiler
was sometimes generating an empty linker.options section which seems
unnecessary. This proposed change causes the compiler to simply omit
emitting the linker.options section if it is empty.
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Global variable `__hip_cuid_*` is for identifying purpose and does not
need sanitization, therefore disable it for sanitizers.
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Behaves as same as both of Clang and GCC targetting MinGW. Required for
compatibility for Cygwin-GCC.
Divided from https://github.com/llvm/llvm-project/pull/138773
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Unused types are retained in the debug info when
-fno-eliminate-unused-debug-types is specified.
However, unused nested enums were not being emitted even with this
option.
This patch fixes the missing emission of unused nested enums with
-fno-eliminate-unused-debug-types
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(equivalent to MSVC /d2epilogunwind) (#129142)
Adds support for emitting Windows x64 Unwind V2 information, includes
support `/d2epilogunwind` in clang-cl.
Unwind v2 adds information about the epilogs in functions such that the
unwinder can unwind even in the middle of an epilog, without having to
disassembly the function to see what has or has not been cleaned up.
Unwind v2 requires that all epilogs are in "canonical" form:
* If there was a stack allocation (fixed or dynamic) in the prolog, then
the first instruction in the epilog must be a stack deallocation.
* Next, for each `PUSH` in the prolog there must be a corresponding
`POP` instruction in exact reverse order.
* Finally, the epilog must end with the terminator.
This change adds a pass to validate epilogs in modules that have Unwind
v2 enabled and, if they pass, emits new pseudo instructions to MC that
1) note that the function is using unwind v2 and 2) mark the start of
the epilog (this is either the first `POP` if there is one, otherwise
the terminator instruction). If a function does not meet these
requirements, it is downgraded to Unwind v1 (i.e., these new pseudo
instructions are not emitted).
Note that the unwind v2 table only marks the size of the epilog in the
"header" unwind code, but it's possible for epilogs to use different
terminator instructions thus they are not all the same size. As a work
around for this, MC will assume that all terminator instructions are
1-byte long - this still works correctly with the Windows unwinder as it
is only using the size to do a range check to see if a thread is in an
epilog or not, and since the instruction pointer will never be in the
middle of an instruction and the terminator is always at the end of an
epilog the range check will function correctly. This does mean, however,
that the "at end" optimization (where an epilog unwind code can be
elided if the last epilog is at the end of the function) can only be
used if the terminator is 1-byte long.
One other complication with the implementation is that the unwind table
for a function is emitted during streaming, however we can't calculate
the distance between an epilog and the end of the function at that time
as layout hasn't been completed yet (thus some instructions may be
relaxed). To work around this, epilog unwind codes are emitted via a
fixup. This also means that we can't pre-emptively downgrade a function
to Unwind v1 if one of these offsets is too large, so instead we raise
an error (but I've passed through the location information, so the user
will know which of their functions is problematic).
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It isn't used and is redundant with the result pointer type argument.
A more reasonable API would only have LangAS parameters, or IR parameters,
not both. Not all values have a meaningful value for this. I'm also
not sure why we have this at all, it's not overridden by any targets and
further simplification is possible.
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attribute (#137769)
OpenCL Kernels body is emitted as stubs and the kernel is emitted as
call to respective stub.
(https://github.com/llvm/llvm-project/pull/115821).
The stub function should be alwaysinlined, since call to stub can cause
performance drop.
Co-authored-by: anikelal <anikelal@amd.com>
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Rename function to meet the coding guidelines.
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For X64 UEFI targets set appropriate integer type sizes, and relevant
ABI information.
---------
Co-authored-by: Petr Hosek <phosek@google.com>
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- Adds resource constructor that takes explicit binding for all resource
classes.
- Updates implementation of default resource constructor to initialize
resource handle to `poison`.
- Removes initialization of resource classes from Codegen.
- Initialization of `cbuffer` still needs to happen in `CGHLSLRuntime`
because it does not have a corresponding resource class type.
- Adds `ImplicitCastExpr` for builtin function calls. Sema adds these
automatically when a method of a template class is instantiated, but
some resource classes like `ByteAddressBuffer` are not templates so they
need to have this added explicitly.
Design proposal: llvm/wg-hlsl#197
Closes #134154
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It appears that OpenMP changes caused this comment to get moved away
from where it was intended, so this patch puts it back next to the
multiversioning code, as intended.
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Use GetAddrOfGlobal, which is a more general API that takes a
GlobalDecl, and handles declaring C++ destructors and other types in a
general way. We can use this to generalize over functions and variable
declarations.
This fixes issues reported on #130674 by @lexi-nadia .
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This is part of a forthcoming fix for issues observed in #91310, and was
unintentionally committed as part of the VTT type changes revert
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(#130674)"
This reverts commit 27c1aa9b9cf9e0b14211758ff8f7d3aaba24ffcf.
See comments on PR. After this change, Clang now asserts like this:
clang: ../llvm/include/llvm/IR/Metadata.h:1435: const MDOperand &llvm::MDNode::getOperand(unsigned int) const: Assertion `I < getNumOperands() && "Out of range"' failed.
...
#8 0x000055f345c4e4cb clang::CodeGen::CGDebugInfo::getOrCreateInstanceMethodType()
#9 0x000055f345c5ba4f clang::CodeGen::CGDebugInfo::EmitFunctionDecl()
#10 0x000055f345b52519 clang::CodeGen::CodeGenModule::EmitExternalFunctionDeclaration()
This is due to pre-existing jankiness in the way BPF emits extra
declarations for debug info, but we should rollback and then fix forward.
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functions. (#133030)
A function declared with the `sycl_kernel_entry_point` attribute,
sometimes called a SYCL kernel entry point function, specifies a pattern
from which the parameters and body of an offload entry point function,
sometimes called a SYCL kernel caller function, are derived.
SYCL kernel caller functions are emitted during SYCL device compilation.
Their parameters and body are derived from the `SYCLKernelCallStmt`
statement and `OutlinedFunctionDecl` declaration associated with their
corresponding SYCL kernel entry point function. A distinct SYCL kernel
caller function is generated for each SYCL kernel entry point function
defined as a non-inline function or ODR-used in the translation unit.
The name of each SYCL kernel caller function is parameterized by the
SYCL kernel name type specified by the `sycl_kernel_entry_point`
attribute attached to the corresponding SYCL kernel entry point
function. For the moment, the Itanium ABI mangled name for typeinfo data
(`_ZTS<type>`) is used to name these functions; a future change will
switch to a more appropriate naming scheme.
The calling convention used for a SYCL kernel caller function is target
dependent. Support for AMDGCN, NVPTX, and SPIR targets is currently
provided. These functions are required to observe the language
restrictions for SYCL devices as specified by the SYCL 2020
specification; this includes a forward progress guarantee and prohibits
recursion.
Only SYCL kernel caller functions, functions declared as
`SYCL_EXTERNAL`, and functions directly or indirectly referenced from
those functions should be emitted during device compilation. Pruning of
other declarations has not yet been implemented.
---------
Co-authored-by: Elizabeth Andrews <elizabeth.andrews@intel.com>
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The purpose of this flag is to allow the compiler to assume that each
object file passed to the linker has been compiled using a unique
source file name. This is useful for reducing link times when doing
ThinLTO in combination with whole-program devirtualization or CFI,
as it allows modules without exported symbols to be built with ThinLTO.
Reviewers: vitalybuka, teresajohnson
Reviewed By: teresajohnson
Pull Request: https://github.com/llvm/llvm-project/pull/135728
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Finding operator delete[] is still problematic, without it the extension
is a security hazard, so reverting until the problem with operator
delete[] is figured out.
This reverts the following PRs:
Reland [MS][clang] Add support for vector deleting destructors (llvm#133451)
[MS][clang] Make sure vector deleting dtor calls correct operator delete (llvm#133950)
[MS][clang] Fix crash on deletion of array of pointers (llvm#134088)
[clang] Do not diagnose unused deleted operator delete[] (llvm#134357)
[MS][clang] Error about ambiguous operator delete[] only when required (llvm#135041)
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This feature is currently not supported in the compiler.
To facilitate this we emit a stub version of each kernel
function body with different name mangling scheme, and
replaces the respective kernel call-sites appropriately.
Fixes https://github.com/llvm/llvm-project/issues/60313
D120566 was an earlier attempt made to upstream a solution
for this issue.
---------
Co-authored-by: anikelal <anikelal@amd.com>
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Whereas it is UB in terms of the standard to delete an array of objects
via pointer whose static type doesn't match its dynamic type, MSVC
supports an extension allowing to do it.
Aside from array deletion not working correctly in the mentioned case,
currently not having this extension implemented causes clang to generate
code that is not compatible with the code generated by MSVC, because
clang always puts scalar deleting destructor to the vftable. This PR
aims to resolve these problems.
It was reverted due to link time errors in chromium with sanitizer
coverage enabled,
which is fixed by https://github.com/llvm/llvm-project/pull/131929 .
The second commit of this PR also contains a fix for a runtime failure
in chromium reported
in
https://github.com/llvm/llvm-project/pull/126240#issuecomment-2730216384
.
Fixes https://github.com/llvm/llvm-project/issues/19772
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function to Triple (#126956)
I'm adding support for SPIR-V, so let's consolidate these checks.
---------
Signed-off-by: Sarnie, Nick <nick.sarnie@intel.com>
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(#132401)
Original PR: #130537
Originally reverted due to revert of dependent commit. Relanding with no
changes.
This changes the MemberPointerType representation to use a
NestedNameSpecifier instead of a Type to represent the base class.
Since the qualifiers are always parsed as nested names, there was an
impedance mismatch when converting these back and forth into types, and
this led to issues in preserving sugar.
The nested names are indeed a better match for these, as the differences
which a QualType can represent cannot be expressed syntatically, and
they represent the use case more exactly, being either dependent or
referring to a CXXRecord, unqualified.
This patch also makes the MemberPointerType able to represent sugar for
a {up/downcast}cast conversion of the base class, although for now the
underlying type is canonical, as preserving the sugar up to that point
requires further work.
As usual, includes a few drive-by fixes in order to make use of the
improvements.
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member" (#132280)
Reverts llvm/llvm-project#132234
Needs to be reverted due to dependency.
This blocks reverting another PR, see here:
https://github.com/llvm/llvm-project/pull/131965#issuecomment-2741619498
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(#132234)
Original PR: #130537
Reland after updating lldb too.
This changes the MemberPointerType representation to use a
NestedNameSpecifier instead of a Type to represent the base class.
Since the qualifiers are always parsed as nested names, there was an
impedance mismatch when converting these back and forth into types, and
this led to issues in preserving sugar.
The nested names are indeed a better match for these, as the differences
which a QualType can represent cannot be expressed syntatically, and
they represent the use case more exactly, being either dependent or
referring to a CXXRecord, unqualified.
This patch also makes the MemberPointerType able to represent sugar for
a {up/downcast}cast conversion of the base class, although for now the
underlying type is canonical, as preserving the sugar up to that point
requires further work.
As usual, includes a few drive-by fixes in order to make use of the
improvements.
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members" (#132215)
Reverts llvm/llvm-project#130537
This missed updating lldb, which we didn't notice due to lack of
pre-commit CI.
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The intrinsic attributes are automatically set when the function
is created, there is no need to assign them explicitly.
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This changes the MemberPointerType representation to use a
NestedNameSpecifier instead of a Type to represent the class.
Since the qualifiers are always parsed as nested names, there was an
impedance mismatch when converting these back and forth into types, and
this led to issues in preserving sugar.
The nested names are indeed a better match for these, as the differences
which a QualType can represent cannot be expressed syntactically, and it
also represents the use case more exactly, being either dependent or
referring to a CXXRecord, unqualified.
This patch also makes the MemberPointerType able to represent sugar for
a {up/downcast}cast conversion of the base class, although for now the
underlying type is canonical, as preserving the sugar up to that point
requires further work.
As usual, includes a few drive-by fixes in order to make use of the
improvements, and removing some duplications, for example
CheckBaseClassAccess is deduplicated from across SemaAccess and
SemaCast.
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This caused link errors when building with sancov. See comment on the PR.
> Whereas it is UB in terms of the standard to delete an array of objects
> via pointer whose static type doesn't match its dynamic type, MSVC
> supports an extension allowing to do it.
> Aside from array deletion not working correctly in the mentioned case,
> currently not having this extension implemented causes clang to generate
> code that is not compatible with the code generated by MSVC, because
> clang always puts scalar deleting destructor to the vftable. This PR
> aims to resolve these problems.
>
> Fixes https://github.com/llvm/llvm-project/issues/19772
This reverts commit d6942d54f677000cf713d2b0eba57b641452beb4.
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