Prif dialect #2
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Prif dialect #2
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jvillette38
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Jun 9, 2025
Fixes llvm#123300 What is seen ``` clang-repl> int x = 42; clang-repl> auto capture = [&]() { return x * 2; }; In file included from <<< inputs >>>:1: input_line_4:1:17: error: non-local lambda expression cannot have a capture-default 1 | auto capture = [&]() { return x * 2; }; | ^ zsh: segmentation fault clang-repl --Xcc="-v" (lldb) bt * thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x8) * frame #0: 0x0000000107b4f8b8 libclang-cpp.19.1.dylib`clang::IncrementalParser::CleanUpPTU(clang::PartialTranslationUnit&) + 988 frame #1: 0x0000000107b4f1b4 libclang-cpp.19.1.dylib`clang::IncrementalParser::ParseOrWrapTopLevelDecl() + 416 frame #2: 0x0000000107b4fb94 libclang-cpp.19.1.dylib`clang::IncrementalParser::Parse(llvm::StringRef) + 612 frame #3: 0x0000000107b52fec libclang-cpp.19.1.dylib`clang::Interpreter::ParseAndExecute(llvm::StringRef, clang::Value*) + 180 frame #4: 0x0000000100003498 clang-repl`main + 3560 frame #5: 0x000000018d39a0e0 dyld`start + 2360 ``` Though the error is justified, we shouldn't be interested in exiting through a segfault in such cases. The issue is that empty named decls weren't being taken care of resulting into this assert https://github.com/llvm/llvm-project/blob/c1a229252617ed58f943bf3f4698bd8204ee0f04/clang/include/clang/AST/DeclarationName.h#L503 Can also be seen when the example is attempted through xeus-cpp-lite. 
jvillette38
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Jun 9, 2025
…142952) This was removed in llvm#135343 in favour of making it a format variable, which we do here. This follows the precedent of the `[opt]` and `[artificial]` markers. Before: ``` thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.2 * frame #0: 0x000000010000037c a.out`inlined1() at inline.cpp:4:3 frame #1: 0x000000010000037c a.out`regular() at inline.cpp:6:17 frame #2: 0x00000001000003b8 a.out`inlined2() at inline.cpp:7:43 frame #3: 0x00000001000003b4 a.out`main at inline.cpp:10:3 frame #4: 0x0000000186345be4 dyld`start + 7040 ``` After (note the `[inlined]` markers): ``` thread #1, queue = 'com.apple.main-thread', stop reason = breakpoint 1.2 * frame #0: 0x000000010000037c a.out`inlined1() at inline.cpp:4:3 [inlined] frame #1: 0x000000010000037c a.out`regular() at inline.cpp:6:17 frame #2: 0x00000001000003b8 a.out`inlined2() at inline.cpp:7:43 [inlined] frame #3: 0x00000001000003b4 a.out`main at inline.cpp:10:3 frame #4: 0x0000000186345be4 dyld`start + 7040 ``` rdar://152642178
JDPailleux
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Aug 8, 2025
Pointers and GEP are untyped. SPIR-V required structured OpAccessChain. This means the backend will have to determine a good way to retrieve the structured access from an untyped GEP. This is not a trivial problem, and needs to be addressed to have a robust compiler. The issue is other workstreams relies on the access chain deduction to work. So we have 2 options: - pause all dependent work until we have a good chain deduction. - submit this limited fix to we can work on both this and other features in parallel. Choice we want to make is #2: submitting this **knowing this is not a good** fix. It only increase the number of patterns we can work with, thus allowing others to continue working on other parts of the backend. This patch as-is has many limitations: - If cannot robustly determine the depth of the structured access from a GEP. Fixing this would require looking ahead at the full GEP chain. - It cannot always figure out the correct access indices, especially with dynamic indices. This will require frontend collaboration. Because we know this is a temporary hack, this patch only impacts the logical SPIR-V target. Physical SPIR-V, which can rely on pointer cast remains on the old method. Related to llvm#145002
JDPailleux
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Aug 8, 2025
…lvm#152156) With this new A320 in-order core, we follow adding the FeatureUseFixedOverScalableIfEqualCost feature to A510 and A520 (llvm#132246), which reaps the same code generation benefits of preferring fixed over scalable when the cost is equal. So when we have: ``` void foo(float* a, float* b, float* dst, unsigned n) { for (unsigned i = 0; i < n; ++i) dst[i] = a[i] + b[i]; } ``` When compiling without the feature enabled, we get: ``` ... ld1b { z0.b }, p0/z, [x0, x10] ld1b { z2.b }, p0/z, [x1, x10] add x12, x0, x10 ldr z1, [x12, #1, mul vl] add x12, x1, x10 ldr z3, [x12, #1, mul vl] fadd z0.s, z2.s, z0.s add x12, x2, x10 fadd z1.s, z3.s, z1.s dech x11 st1b { z0.b }, p0, [x2, x10] incb x10, all, mul #2 str z1, [x12, #1, mul vl] ... ``` When compiling with, we get: ``` ... ldp q0, q1, [x12, #-16] ldp q2, q3, [x11, #-16] subs x13, x13, llvm#8 fadd v0.4s, v2.4s, v0.4s fadd v1.4s, v3.4s, v1.4s add x11, x11, llvm#32 add x12, x12, llvm#32 stp q0, q1, [x10, #-16] add x10, x10, llvm#32 ... ```
JDPailleux
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Aug 14, 2025
## Problem When the new setting ``` set target.parallel-module-load true ``` was added, lldb began fetching modules from the devices from multiple threads simultaneously. This caused crashes of lldb when debugging on android devices. The top of the stack in the crash look something like this: ``` #0 0x0000555aaf2b27fe llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/llvm/bin/lldb-dap+0xb87fe) #1 0x0000555aaf2b0a99 llvm::sys::RunSignalHandlers() (/opt/llvm/bin/lldb-dap+0xb6a99) #2 0x0000555aaf2b2fda SignalHandler(int, siginfo_t*, void*) (/opt/llvm/bin/lldb-dap+0xb8fda) #3 0x00007f9c02444560 __restore_rt /home/engshare/third-party2/glibc/2.34/src/glibc-2.34/signal/../sysdeps/unix/sysv/linux/libc_sigaction.c:13:0 #4 0x00007f9c04ea7707 lldb_private::ConnectionFileDescriptor::Disconnect(lldb_private::Status*) (usr/bin/../lib/liblldb.so.15+0x22a7707) #5 0x00007f9c04ea5b41 lldb_private::ConnectionFileDescriptor::~ConnectionFileDescriptor() (usr/bin/../lib/liblldb.so.15+0x22a5b41) #6 0x00007f9c04ea5c1e lldb_private::ConnectionFileDescriptor::~ConnectionFileDescriptor() (usr/bin/../lib/liblldb.so.15+0x22a5c1e) llvm#7 0x00007f9c052916ff lldb_private::platform_android::AdbClient::SyncService::Stat(lldb_private::FileSpec const&, unsigned int&, unsigned int&, unsigned int&) (usr/bin/../lib/liblldb.so.15+0x26916ff) llvm#8 0x00007f9c0528b9dc lldb_private::platform_android::PlatformAndroid::GetFile(lldb_private::FileSpec const&, lldb_private::FileSpec const&) (usr/bin/../lib/liblldb.so.15+0x268b9dc) ``` Our workaround was to set `set target.parallel-module-load ` to `false` to avoid the crash. ## Background PlatformAndroid creates two different classes with one stateful adb connection shared between the two -- one through AdbClient and another through AdbClient::SyncService. The connection management and state is complex, and seems to be responsible for the segfault we are seeing. The AdbClient code resets these connections at times, and re-establishes connections if they are not active. Similarly, PlatformAndroid caches its SyncService, which uses an AdbClient class, but the SyncService puts its connection into a different 'sync' state that is incompatible with a standard connection. ## Changes in this diff * This diff refactors the code to (hopefully) have clearer ownership of the connection, clearer separation of AdbClient and SyncService by making a new class for clearer separations of concerns, called AdbSyncService. * New unit tests are added * Additional logs were added (see llvm#145382 (comment) for details)
JDPailleux
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Aug 14, 2025
…namic (llvm#153420) Canonicalizing the following IR: ``` func.func @mul_zero_dynamic_nofold(%arg0: tensor<?x17xf32>) -> tensor<?x17xf32> { %0 = "tosa.const"() <{values = dense<0.000000e+00> : tensor<1x1xf32>}> : () -> tensor<1x1xf32> %1 = "tosa.const"() <{values = dense<0> : tensor<1xi8>}> : () -> tensor<1xi8> %2 = tosa.mul %arg0, %0, %1 : (tensor<?x17xf32>, tensor<1x1xf32>, tensor<1xi8>) -> tensor<?x17xf32> return %2 : tensor<?x17xf32> } ``` resulted in a crash ``` #0 0x000056513187e8db backtrace (./build-release/bin/mlir-opt+0x9d698db) #1 0x0000565131b17737 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) /local-ssd/sayans/Softwares/llvm-repo/llvm-project-latest/llvm/lib/Support/Unix/Signals.inc:838:8 #2 0x0000565131b187f3 PrintStackTraceSignalHandler(void*) /local-ssd/sayans/Softwares/llvm-repo/llvm-project-latest/llvm/lib/Support/Unix/Signals.inc:918:1 #3 0x0000565131b18c30 llvm::sys::RunSignalHandlers() /local-ssd/sayans/Softwares/llvm-repo/llvm-project-latest/llvm/lib/Support/Signals.cpp:105:18 #4 0x0000565131b18c30 SignalHandler(int, siginfo_t*, void*) /local-ssd/sayans/Softwares/llvm-repo/llvm-project-latest/llvm/lib/Support/Unix/Signals.inc:409:3 #5 0x00007f2e4165b050 (/lib/x86_64-linux-gnu/libc.so.6+0x3c050) #6 0x00007f2e416a9eec __pthread_kill_implementation ./nptl/pthread_kill.c:44:76 llvm#7 0x00007f2e4165afb2 raise ./signal/../sysdeps/posix/raise.c:27:6 llvm#8 0x00007f2e41645472 abort ./stdlib/abort.c:81:7 llvm#9 0x00007f2e41645395 _nl_load_domain ./intl/loadmsgcat.c:1177:9 llvm#10 0x00007f2e41653ec2 (/lib/x86_64-linux-gnu/libc.so.6+0x34ec2) llvm#11 0x00005651443ec4ba mlir::DenseIntOrFPElementsAttr::getRaw(mlir::ShapedType, llvm::ArrayRef<char>) /local-ssd/sayans/Softwares/llvm-repo/llvm-project-latest/mlir/lib/IR/BuiltinAttributes.cpp:1361:3 llvm#12 0x00005651443f1209 mlir::DenseElementsAttr::resizeSplat(mlir::ShapedType) /local-ssd/sayans/Softwares/llvm-repo/llvm-project-latest/mlir/lib/IR/BuiltinAttributes.cpp:0:10 llvm#13 0x000056513f76f2b6 mlir::tosa::MulOp::fold(mlir::tosa::MulOpGenericAdaptor<llvm::ArrayRef<mlir::Attribute>>) /local-ssd/sayans/Softwares/llvm-repo/llvm-project-latest/mlir/lib/Dialect/Tosa/IR/TosaCanonicalizations.cpp:0:0 ``` from the folder for `tosa::mul` since the zero value was being reshaped to `?x17` size which isn't supported. AFAIK, `tosa.const` requires all dimensions to be static. So in this case, the fix is to not to fold the op.
JDPailleux
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Aug 20, 2025
This can happen when JIT code is run, and we can't symbolize those
frames, but they should remain numbered in the stack. An example
spidermonkey trace:
```
#0 0x564ac90fb80f (/builds/worker/dist/bin/js+0x240e80f) (BuildId: 5d053c76aad4cfbd08259f8832e7ac78bbeeab58)
#1 0x564ac9223a64 (/builds/worker/dist/bin/js+0x2536a64) (BuildId: 5d053c76aad4cfbd08259f8832e7ac78bbeeab58)
#2 0x564ac922316f (/builds/worker/dist/bin/js+0x253616f) (BuildId: 5d053c76aad4cfbd08259f8832e7ac78bbeeab58)
#3 0x564ac9eac032 (/builds/worker/dist/bin/js+0x31bf032) (BuildId: 5d053c76aad4cfbd08259f8832e7ac78bbeeab58)
#4 0x0dec477ca22e (<unknown module>)
```
Without this change, the following symbolization is output:
```
#0 0x55a6d72f980f in MOZ_CrashSequence /builds/worker/workspace/obj-build/dist/include/mozilla/Assertions.h:248:3
#1 0x55a6d72f980f in Crash(JSContext*, unsigned int, JS::Value*) /builds/worker/checkouts/gecko/js/src/shell/js.cpp:4223:5
#2 0x55a6d7421a64 in CallJSNative(JSContext*, bool (*)(JSContext*, unsigned int, JS::Value*), js::CallReason, JS::CallArgs const&) /builds/worker/checkouts/gecko/js/src/vm/Interpreter.cpp:501:13
#3 0x55a6d742116f in js::InternalCallOrConstruct(JSContext*, JS::CallArgs const&, js::MaybeConstruct, js::CallReason) /builds/worker/checkouts/gecko/js/src/vm/Interpreter.cpp:597:12
#4 0x55a6d80aa032 in js::jit::DoCallFallback(JSContext*, js::jit::BaselineFrame*, js::jit::ICFallbackStub*, unsigned int, JS::Value*, JS::MutableHandle<JS::Value>) /builds/worker/checkouts/gecko/js/src/jit/BaselineIC.cpp:1705:10
#4 0x2c803bd8f22e (<unknown module>)
```
The last frame has a duplicate number. With this change the numbering is
correct:
```
#0 0x5620c58ec80f in MOZ_CrashSequence /builds/worker/workspace/obj-build/dist/include/mozilla/Assertions.h:248:3
#1 0x5620c58ec80f in Crash(JSContext*, unsigned int, JS::Value*) /builds/worker/checkouts/gecko/js/src/shell/js.cpp:4223:5
#2 0x5620c5a14a64 in CallJSNative(JSContext*, bool (*)(JSContext*, unsigned int, JS::Value*), js::CallReason, JS::CallArgs const&) /builds/worker/checkouts/gecko/js/src/vm/Interpreter.cpp:501:13
#3 0x5620c5a1416f in js::InternalCallOrConstruct(JSContext*, JS::CallArgs const&, js::MaybeConstruct, js::CallReason) /builds/worker/checkouts/gecko/js/src/vm/Interpreter.cpp:597:12
#4 0x5620c669d032 in js::jit::DoCallFallback(JSContext*, js::jit::BaselineFrame*, js::jit::ICFallbackStub*, unsigned int, JS::Value*, JS::MutableHandle<JS::Value>) /builds/worker/checkouts/gecko/js/src/jit/BaselineIC.cpp:1705:10
#5 0x349f24c7022e (<unknown module>)
```
JDPailleux
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Sep 10, 2025
Reverts llvm#154949 due to suspected buildbot breakage (https://lab.llvm.org/buildbot/#/builders/55/builds/16630/steps/11/logs/stdio). Previously commented on the original pull request: llvm#154949 (comment) ``` ******************** TEST 'MLIR :: Dialect/XeGPU/subgroup-distribute.mlir' FAILED ******************** ... # | PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace. # | Stack dump: # | 0. Program arguments: /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm_build_hwasan/bin/mlir-opt -xegpu-subgroup-distribute -allow-unregistered-dialect -canonicalize -cse -split-input-file /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/mlir/test/Dialect/XeGPU/subgroup-distribute.mlir # | #0 0x0000c0af4b066df0 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/lib/Support/Unix/Signals.inc:834:13 # | #1 0x0000c0af4b060e20 llvm::sys::RunSignalHandlers() /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/lib/Support/Signals.cpp:105:18 # | #2 0x0000c0af4b0691b4 SignalHandler(int, siginfo_t*, void*) /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/llvm/lib/Support/Unix/Signals.inc:426:38 # | #3 0x0000ee25a3dcb8f8 (linux-vdso.so.1+0x8f8) # | #4 0x0000ee25a36c7608 (/lib/aarch64-linux-gnu/libc.so.6+0x87608) # | #5 0x0000ee25a367cb3c raise (/lib/aarch64-linux-gnu/libc.so.6+0x3cb3c) # | #6 0x0000ee25a3667e00 abort (/lib/aarch64-linux-gnu/libc.so.6+0x27e00) # | llvm#7 0x0000c0af4ae7e4b0 __sanitizer::Atexit(void (*)()) /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cpp:168:10 # | llvm#8 0x0000c0af4ae7c354 __sanitizer::Die() /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_termination.cpp:52:5 # | llvm#9 0x0000c0af4ae66a30 Unlock /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/compiler-rt/lib/hwasan/../sanitizer_common/sanitizer_mutex.h:250:16 # | llvm#10 0x0000c0af4ae66a30 ~GenericScopedLock /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/compiler-rt/lib/hwasan/../sanitizer_common/sanitizer_mutex.h:386:51 # | llvm#11 0x0000c0af4ae66a30 __hwasan::ScopedReport::~ScopedReport() /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/compiler-rt/lib/hwasan/hwasan_report.cpp:54:5 # | llvm#12 0x0000c0af4ae661b8 __hwasan::(anonymous namespace)::BaseReport::~BaseReport() /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/compiler-rt/lib/hwasan/hwasan_report.cpp:477:7 # | llvm#13 0x0000c0af4ae63f5c __hwasan::ReportTagMismatch(__sanitizer::StackTrace*, unsigned long, unsigned long, bool, bool, unsigned long*) /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/compiler-rt/lib/hwasan/hwasan_report.cpp:1094:1 # | llvm#14 0x0000c0af4ae4f8e0 Destroy /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/compiler-rt/lib/hwasan/../sanitizer_common/sanitizer_common.h:532:31 # | llvm#15 0x0000c0af4ae4f8e0 ~InternalMmapVector /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/compiler-rt/lib/hwasan/../sanitizer_common/sanitizer_common.h:642:56 # | llvm#16 0x0000c0af4ae4f8e0 __hwasan::HandleTagMismatch(__hwasan::AccessInfo, unsigned long, unsigned long, void*, unsigned long*) /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/compiler-rt/lib/hwasan/hwasan.cpp:245:1 # | llvm#17 0x0000c0af4ae51e8c __hwasan_tag_mismatch4 /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/compiler-rt/lib/hwasan/hwasan.cpp:764:1 # | llvm#18 0x0000c0af4ae67b30 __interception::InterceptFunction(char const*, unsigned long*, unsigned long, unsigned long) /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/compiler-rt/lib/interception/interception_linux.cpp:60:0 # | llvm#19 0x0000c0af5641cd24 getNumResults /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/mlir/include/mlir/IR/Operation.h:404:37 # | llvm#20 0x0000c0af5641cd24 getOpResultImpl /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/mlir/include/mlir/IR/Operation.h:1010:5 # | llvm#21 0x0000c0af5641cd24 getResult /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/mlir/include/mlir/IR/Operation.h:407:54 # | llvm#22 0x0000c0af5641cd24 mlir::OpTrait::detail::MultiResultTraitBase<mlir::gpu::WarpExecuteOnLane0Op, mlir::OpTrait::VariadicResults>::getResult(unsigned int) /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/mlir/include/mlir/IR/OpDefinition.h:638:62 # | llvm#23 0x0000c0af56426b60 getType /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/mlir/include/mlir/IR/Value.h:63:33 # | llvm#24 0x0000c0af56426b60 getType /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/mlir/include/mlir/IR/Value.h:105:39 # | llvm#25 0x0000c0af56426b60 (anonymous namespace)::LoadDistribution::matchAndRewrite(mlir::gpu::WarpExecuteOnLane0Op, mlir::PatternRewriter&) const /home/b/sanitizer-aarch64-linux-bootstrap-hwasan/build/llvm-project/mlir/lib/Dialect/XeGPU/Transforms/XeGPUSubgroupDistribute.cpp:991:55 ... ```
JDPailleux
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Sep 22, 2025
A few improvements to logging when lldb-dap is started in **Server Mode** AND when the **`lldb-dap.logFolder`** setting is used (not `lldb-dap.log-path`). ### Improvement #1 **Avoid the prompt of restarting the server when starting each debug session.** That prompt is caused by the combination of the following facts: 1. The log filename changes every time a new debug session is starting (see [here](https://github.com/llvm/llvm-project/blob/9d6062c490548a5e6fea103e010ab3c9bc73a86d/lldb/tools/lldb-dap/src-ts/logging.ts#L47)) 2. The log filename is passed to the server via an environment variable called "LLDBDAP_LOG" (see [here](https://github.com/llvm/llvm-project/blob/9d6062c490548a5e6fea103e010ab3c9bc73a86d/lldb/tools/lldb-dap/src-ts/debug-adapter-factory.ts#L263-L269)) 3. All environment variables are put into the "spawn info" variable (see [here](https://github.com/llvm/llvm-project/blob/9d6062c490548a5e6fea103e010ab3c9bc73a86d/lldb/tools/lldb-dap/src-ts/lldb-dap-server.ts#L170-L172)). 4. The old and new "spawn info" are compared to decide if a prompt should show (see [here](https://github.com/llvm/llvm-project/blob/9d6062c490548a5e6fea103e010ab3c9bc73a86d/lldb/tools/lldb-dap/src-ts/lldb-dap-server.ts#L107-L110)). The fix is to remove the "LLDBDAP_LOG" from the "spawn info" variable, so that the same server can be reused if the log path is the only thing that has changed. ### Improvement #2 **Avoid log file conflict when multiple users share a machine and start server in the same second.** The problem: If two users start lldb-dap server in the same second, they will share the same log path. The first user will create the log file. The second user will find that they cannot access the same file, so their server will fail to start. The fix is to add a part of the VS Code session ID to the log filename. ### Improvement #3 **Avoid restarting the server when the order of environment variables changed.** This is done by sorting the environment variables before putting them into the "spawn info".
JDPailleux
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Sep 25, 2025
Need this as `mlir/dialects/transform/smt.py` imports it: ```py from .._transform_smt_extension_ops_gen import * from .._transform_smt_extension_ops_gen import _Dialect ```
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Hello,
This PR is a discussion around a dialect to define “prif” operations in Flang. This is a draft and a few operations have been proposed to start with and see if they might be suitable.
The set of operations will be based on what is presented in the PRIF specification, which can be found here: : https://doi.org/10.25344/S4CG6G