[HLSL] Emit lifetime.start before copy-in for inout parameters (#191917)
For inout parameters, Clang was emitting lifetime.start after the
copy-in store that initializes the temporary. Per LLVM's lifetime
semantics, any access to memory outside its lifetime is undefined
behavior, so the copy-in store was technically UB and the value was
undefined after lifetime.start.
Move EmitLifetimeStart into EmitHLSLOutArgLValues so that it is emitted
before EmitInitializationToLValue, putting the copy-in store within the
lifetime of the temporary.
---------
Co-authored-by: Alexandre Isoard <alexandre.isoard at amd.com>
Co-authored-by: Deric C. <cheung.deric at gmail.com>
[lldb] Survive ptrace(PT_DENY_ATTACH) when attaching (#204688) (#205198)
A process can opt out of being debugged with ptrace(PT_DENY_ATTACH). The
XNU kernel enforces this by delivering SIGSEGV to the *attaching*
process while it is still inside the ptrace(PT_ATTACHEXC) syscall. This
means debugserver gets killed before it can inspect the result. LLDB
only sees the dropped connection ("error: attach failed: lost
connection").
The condition can't be detected up front: the target's P_LNOATTACH flag
is not exposed to userspace. To work around this, install a temporary
SIGSEGV handler around the ptrace(PT_ATTACHEXC) call in AttachForDebug
and siglongjmp back out if it fires, turning the fatal signal into an
EPERM that propagates to lldb as a clear message:
```
error: attach failed: cannot attach to process N because it has
disabled debugging via ptrace(PT_DENY_ATTACH)
```
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[Clang] Fix crash when comparing fixed point type with BitInt (#199912)
Fixes #196948
Added checks in `handleFixedPointConversion`: reject fixed point/BitInt
comparisons
Now clang properly emits an error instead of crashing.
---------
Co-authored-by: cry <2091136672 at foxmail.com>
Change 'benign-entity-name-conflict.cpp' to
'entity-name-no-conflict.cpp' because it is a USR generation bug even
though the erroneous behavior is benign in this example.
[Instrumentor] Add runtime examples: [1/N] A flop counter
This adds a instrumentor-examples folder into compiler RT to showcase
use cases of the instrumentor. The initial example is a program that,
via instrumentation, counts the number of flops performed.
Partially developped by Claude (AI), tested and verified by me.
[docs] Rename LangRef.{rst|md}
Tracking issue: #201242
This commit does not use valid markdown, so the docs will not build, but they will be fixed in an immediate follow-up commit that does the migration.
[CIR] Use the AST result type for sizeof/alignof constants (#203942)
On targets where `size_t` is narrower than 64 bits (e.g. `i686`), CIR
codegen for `sizeof`/`alignof`/`__builtin_vectorelements` crashes with a
type/value bitwidth mismatch.
The result of these expressions is `size_t`, but the emitted integer
constant was built with a hardcoded 64-bit type. `EvaluateKnownConstInt`
returns an `APSInt` with the width of the AST result type (32 bits on
this target), so it no longer matches the `IntAttr`'s type and trips the
`IntAttr` verifier.
### How to Reproduce
```c++
using size_t = decltype(sizeof(int));
size_t size_of_int() { return sizeof(int); }
clang -cc1 -std=c++20 -triple i686-unknown-linux-gnu -fclangir \
-emit-cir test.cpp -o test.cir
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[AMDGPU] Fold constant offsets into named barrier addresses
Allow isOffsetFoldingLegal to fold a constant offset into an LDS
named-barrier global, and include the node offset when materializing the
LDS address in LowerGlobalAddress. s_barrier_signal_var on a GEP'd named
barrier now selects the immediate form, matching a bare global and GlobalISel.
Change-Id: I2ce500917c3d47cd3687473406decc7430d73361
Assisted-by: Cursor
[AMDGPU] Pre-commit test for constant-offset named barrier signal_var
A GEP into a named-barrier array (&bars[1]) lowers s_barrier_signal_var to
the dynamic m0 form on SelectionDAG, unlike the bare global and GlobalISel.
Change-Id: I8846eb200b1e28785adfdfcaa082390170f4ea2d
Assisted-by: Cursor
[lldb] Use heuristics to extend rather than replace error message (#205196)
When an attach fails, HandlePacket_A tries to explain why. The last two
checks are heuristics that discard any error debugserver already
produced for this specific failure.
The guess can be wrong, for example the PT_DENY_ATTACH test case from
#204688 is incorrectly reported as failing due to it running in a
non-interactive debug session on the bots.
Include debugserver's real error into the heuristic message, instead of
replacing it, so the real reason is never lost.
[SCEV] Preserve LCSSA when reusing dominating variable
This seems to just be a missing case in SCEV. This came up when looking
at making LSR preserve LCSSA for the NewPM. Regression test of that
nature has been added.
Reviewers: fhahn, nikic, arsenm
Pull Request: https://github.com/llvm/llvm-project/pull/192831
[MemoryBuiltins][NFC] Allow users to retrieve detailed (de)allocation info
There are some helpers to inspect a value or call but not all
information about the (de)allocation are made available outside of
MemoryBuiltins.cpp. The two new functions allow users a more in-depth
view of (de)allocations through a single API. To help with this, we now
read the alloc_align attribute to provide better alignment information
to users. alloc-family is used as well. Two new helpers provide argument
numbers, rather than values.
Co-authored-by: Antonio Frighetto <me at antoniofrighetto.com>
[OpenMP] Introduce the ompx_name clause for kernel naming
This adds support for the ompx_name clause that allows users to specify
custom kernel names for OpenMP target offloading regions. The clause
accepts a string literal and overrides the default compiler-generated
kernel names.
Example usage:
#pragma omp target ompx_name("my_kernel")
{ ... }
Kernel names need to be unique or they are diagnosed at compile or link
time as errors.
Co-Authored-By: Claude (claude-sonnet-4.5) <noreply at anthropic.com>
[docs] Minor edits to project governace docs (#203149)
s/non-private/public/
Pencil in the 2027 calendar year election dates, so they are posted well
in advance and we have a link anchor we can share.
[llvm-cas] Fix validation test on Ubuntu / uutils v0.2.2, NFC (#205199)
Work around uutils/coreutils#9128 by implementing the 40 byte truncation
in Python. Otherwise, this test fails out of the box on Ubuntu 25.10.
GNU coreutils supports -s=arg, but Mac truncate does not. Resorting to
Python seemed like the cleanest solution. The next best idea was to use
subshells or other techniques to calculate the file size and subtract
40, but that seemed excessive.
[flang] Reduce FIR AA overhead for functions with one scope. (#204009)
Avoid overheads of collectScopedOrigins and
getDeclarationScope/DominanceInfo
when the values passed to FIR AA belong to a function with a single
dummy scope.
