[CIR] Add cir-translate and cir-lsp-server tools #131181

mmha · 2025-03-13T18:18:11Z

Adds two new clang tools to the tree.

cir-translate: Translates CIR to LLVM, similar to mlir-translate
cir-lsp-server: Implementation of the Language Server Protocol for ClangIR, similar to fir-lsp-server

@erichkeane @andykaylor @dkolsen-pgi

llvmbot · 2025-03-13T18:18:43Z

@llvm/pr-subscribers-clang

@llvm/pr-subscribers-clangir

Author: Morris Hafner (mmha)

Changes

@erichkeane @andykaylor @dkolsen-pgi

Full diff: https://github.com/llvm/llvm-project/pull/131181.diff

12 Files Affected:

(added) clang/test/CIR/Tools/cir-translate-triple.cir (+11)
(added) clang/test/CIR/Tools/has-triple-and-data-layout.cir (+24)
(added) clang/test/CIR/Tools/has-triple-no-data-layout.cir (+23)
(added) clang/test/CIR/Tools/invalid-translate-triple.cir (+8)
(added) clang/test/CIR/Tools/no-triple-has-data-layout.cir (+18)
(added) clang/test/CIR/Tools/no-triple-no-data-layout.cir (+16)
(added) clang/test/CIR/Tools/warn-default-triple.cir (+8)
(modified) clang/tools/CMakeLists.txt (+2)
(added) clang/tools/cir-lsp-server/CMakeLists.txt (+34)
(added) clang/tools/cir-lsp-server/cir-lsp-server.cpp (+24)
(added) clang/tools/cir-translate/CMakeLists.txt (+35)
(added) clang/tools/cir-translate/cir-translate.cpp (+166)

diff --git a/clang/test/CIR/Tools/cir-translate-triple.cir b/clang/test/CIR/Tools/cir-translate-triple.cir
new file mode 100644
index 0000000000000..fa653ef3de25f
--- /dev/null
+++ b/clang/test/CIR/Tools/cir-translate-triple.cir
@@ -0,0 +1,11 @@
+// RUN: cir-translate --cir-to-llvmir --target x86_64-unknown-linux-gnu --disable-cc-lowering %s -o %t.ll
+// RUN: FileCheck %s -input-file %t.ll -check-prefix=LLVM
+
+module {
+  cir.func @foo() {
+    cir.return
+  }
+}
+
+// LLVM-DAG: target triple = "x86_64-unknown-linux-gnu"
+// LLVM-DAG: target datalayout = "{{.*}}"
diff --git a/clang/test/CIR/Tools/has-triple-and-data-layout.cir b/clang/test/CIR/Tools/has-triple-and-data-layout.cir
new file mode 100644
index 0000000000000..81da113f1d648
--- /dev/null
+++ b/clang/test/CIR/Tools/has-triple-and-data-layout.cir
@@ -0,0 +1,24 @@
+// RUN: cir-translate --cir-to-llvmir --target x86_64-unknown-linux-gnu --disable-cc-lowering %s -o %t.x86.ll
+// RUN: FileCheck %s -input-file %t.x86.ll -check-prefix=X86
+// RUN: cir-translate --cir-to-llvmir --target spirv64-unknown-unknown --disable-cc-lowering %s -o %t.spirv64.ll
+// RUN: FileCheck %s -input-file %t.spirv64.ll -check-prefix=SPIRV64
+// RUN: cir-translate --cir-to-llvmir --disable-cc-lowering %s -o %t.default.ll
+// RUN: FileCheck %s -input-file %t.default.ll -check-prefix=DEFAULT
+
+module attributes {
+  cir.triple = "spirv64-unknown-unknown",
+  dlti.dl_spec = #dlti.dl_spec<"dlti.global_memory_space" = 7 : ui64>
+} {
+  cir.func @foo() {
+    cir.return
+  }
+}
+
+// X86-NOT: target datalayout = "G7"
+// X86-DAG: target triple = "x86_64-unknown-linux-gnu"
+
+// SPIRV64-NOT: target datalayout = "G7"
+// SPIRV64-DAG: target triple = "spirv64-unknown-unknown"
+
+// DEFAULT-DAG: target datalayout = "G7"
+// DEFAULT-DAG: target triple = "spirv64-unknown-unknown"
diff --git a/clang/test/CIR/Tools/has-triple-no-data-layout.cir b/clang/test/CIR/Tools/has-triple-no-data-layout.cir
new file mode 100644
index 0000000000000..34c543362bed1
--- /dev/null
+++ b/clang/test/CIR/Tools/has-triple-no-data-layout.cir
@@ -0,0 +1,23 @@
+// RUN: cir-translate --cir-to-llvmir --target x86_64-unknown-linux-gnu --disable-cc-lowering %s -o %t.x86.ll
+// RUN: FileCheck %s -input-file %t.x86.ll -check-prefix=X86
+// RUN: cir-translate --cir-to-llvmir --target spirv64-unknown-unknown --disable-cc-lowering %s -o %t.spirv64.ll
+// RUN: FileCheck %s -input-file %t.spirv64.ll -check-prefix=SPIRV64
+// RUN: cir-translate --cir-to-llvmir --disable-cc-lowering %s -o %t.default.ll
+// RUN: FileCheck %s -input-file %t.default.ll -check-prefix=DEFAULT
+
+module attributes {
+  cir.triple = "spirv64-unknown-unknown"
+} {
+  cir.func @foo() {
+    cir.return
+  }
+}
+
+// X86-DAG: target triple = "x86_64-unknown-linux-gnu"
+// X86-DAG: target datalayout = "{{.*}}"
+
+// SPIRV64-DAG: target triple = "spirv64-unknown-unknown"
+// SPIRV64-DAG: target datalayout = "{{.*}}"
+
+// DEFAULT-DAG: target triple = "spirv64-unknown-unknown"
+// DEFAULT-DAG: target datalayout = "{{.*}}"
diff --git a/clang/test/CIR/Tools/invalid-translate-triple.cir b/clang/test/CIR/Tools/invalid-translate-triple.cir
new file mode 100644
index 0000000000000..07bd766a37875
--- /dev/null
+++ b/clang/test/CIR/Tools/invalid-translate-triple.cir
@@ -0,0 +1,8 @@
+// RUN: cir-translate -verify-diagnostics --cir-to-llvmir --target foobar --disable-cc-lowering %s 2>&1
+
+// expected-error@below {{invalid target triple 'foobar'}}
+module {
+  cir.func @foo() {
+    cir.return
+  }
+}
diff --git a/clang/test/CIR/Tools/no-triple-has-data-layout.cir b/clang/test/CIR/Tools/no-triple-has-data-layout.cir
new file mode 100644
index 0000000000000..5dc2fdb75a7cc
--- /dev/null
+++ b/clang/test/CIR/Tools/no-triple-has-data-layout.cir
@@ -0,0 +1,18 @@
+// RUN: cir-translate --cir-to-llvmir --target x86_64-unknown-linux-gnu --disable-cc-lowering %s -o %t.x86.ll
+// RUN: FileCheck %s -input-file %t.x86.ll -check-prefix=X86
+// RUN: cir-translate --cir-to-llvmir --target spirv64-unknown-unknown --disable-cc-lowering %s -o %t.spirv64.ll
+// RUN: FileCheck %s -input-file %t.spirv64.ll -check-prefix=SPIRV64
+
+module attributes {
+  dlti.dl_spec = #dlti.dl_spec<"dlti.global_memory_space" = 7 : ui64>
+} {
+  cir.func @foo() {
+    cir.return
+  }
+}
+
+// X86-NOT: target datalayout = "G7"
+// X86-DAG: target triple = "x86_64-unknown-linux-gnu"
+
+// SPIRV64-NOT: target datalayout = "G7"
+// SPIRV64-DAG: target triple = "spirv64-unknown-unknown"
diff --git a/clang/test/CIR/Tools/no-triple-no-data-layout.cir b/clang/test/CIR/Tools/no-triple-no-data-layout.cir
new file mode 100644
index 0000000000000..2e336a797c6a7
--- /dev/null
+++ b/clang/test/CIR/Tools/no-triple-no-data-layout.cir
@@ -0,0 +1,16 @@
+// RUN: cir-translate --cir-to-llvmir --target x86_64-unknown-linux-gnu --disable-cc-lowering %s -o %t.x86.ll
+// RUN: FileCheck %s -input-file %t.x86.ll -check-prefix=X86
+// RUN: cir-translate --cir-to-llvmir --target spirv64-unknown-unknown --disable-cc-lowering %s -o %t.spirv64.ll
+// RUN: FileCheck %s -input-file %t.spirv64.ll -check-prefix=SPIRV64
+
+module {
+  cir.func @foo() {
+    cir.return
+  }
+}
+
+// X86-DAG: target triple = "x86_64-unknown-linux-gnu"
+// X86-DAG: target datalayout = "{{.*}}"
+
+// SPIRV64-DAG: target triple = "spirv64-unknown-unknown"
+// SPIRV64-DAG: target datalayout = "{{.*}}"
diff --git a/clang/test/CIR/Tools/warn-default-triple.cir b/clang/test/CIR/Tools/warn-default-triple.cir
new file mode 100644
index 0000000000000..9eeba69e98973
--- /dev/null
+++ b/clang/test/CIR/Tools/warn-default-triple.cir
@@ -0,0 +1,8 @@
+// RUN: cir-translate -verify-diagnostics --cir-to-llvmir --disable-cc-lowering %s
+
+// expected-warning@below {{no target triple provided, assuming}}
+module {
+  cir.func @foo() {
+    cir.return
+  }
+}
diff --git a/clang/tools/CMakeLists.txt b/clang/tools/CMakeLists.txt
index ae3414e177192..e3557c1328d53 100644
--- a/clang/tools/CMakeLists.txt
+++ b/clang/tools/CMakeLists.txt
@@ -5,6 +5,8 @@ add_clang_subdirectory(driver)
 add_clang_subdirectory(apinotes-test)
 if(CLANG_ENABLE_CIR)
   add_clang_subdirectory(cir-opt)
+  add_clang_subdirectory(cir-translate)
+  add_clang_subdirectory(cir-lsp-server)
 endif()
 add_clang_subdirectory(clang-diff)
 add_clang_subdirectory(clang-format)
diff --git a/clang/tools/cir-lsp-server/CMakeLists.txt b/clang/tools/cir-lsp-server/CMakeLists.txt
new file mode 100644
index 0000000000000..aad2646ce0187
--- /dev/null
+++ b/clang/tools/cir-lsp-server/CMakeLists.txt
@@ -0,0 +1,34 @@
+get_property(dialect_libs GLOBAL PROPERTY MLIR_DIALECT_LIBS)
+get_property(conversion_libs GLOBAL PROPERTY MLIR_CONVERSION_LIBS)
+
+include_directories(${LLVM_MAIN_SRC_DIR}/../mlir/include)
+include_directories(${CMAKE_BINARY_DIR}/tools/mlir/include)
+
+set(LIBS
+  ${dialect_libs}
+  ${conversion_libs}
+  ${test_libs}
+  clangCIR
+  clangCIRLoweringDirectToLLVM
+  MLIRCIR
+  MLIRAffineAnalysis
+  MLIRAnalysis
+  MLIRDialect
+  MLIRLspServerLib
+  MLIRParser
+  MLIRPass
+  MLIRTransforms
+  MLIRTransformUtils
+  MLIRSupport
+  MLIRIR
+  )
+
+add_mlir_tool(cir-lsp-server
+  cir-lsp-server.cpp
+
+  DEPENDS
+  ${LIBS}
+)
+
+target_link_libraries(cir-lsp-server PRIVATE ${LIBS})
+llvm_update_compile_flags(cir-lsp-server)
diff --git a/clang/tools/cir-lsp-server/cir-lsp-server.cpp b/clang/tools/cir-lsp-server/cir-lsp-server.cpp
new file mode 100644
index 0000000000000..555967a5a21d5
--- /dev/null
+++ b/clang/tools/cir-lsp-server/cir-lsp-server.cpp
@@ -0,0 +1,24 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// A language server for ClangIR
+//
+//===----------------------------------------------------------------------===//
+
+#include "mlir/IR/Dialect.h"
+#include "mlir/IR/MLIRContext.h"
+#include "mlir/InitAllDialects.h"
+#include "mlir/Tools/mlir-lsp-server/MlirLspServerMain.h"
+#include "clang/CIR/Dialect/IR/CIRDialect.h"
+
+int main(int argc, char **argv) {
+  mlir::DialectRegistry registry;
+  mlir::registerAllDialects(registry);
+  registry.insert<cir::CIRDialect>();
+  return failed(mlir::MlirLspServerMain(argc, argv, registry));
+}
diff --git a/clang/tools/cir-translate/CMakeLists.txt b/clang/tools/cir-translate/CMakeLists.txt
new file mode 100644
index 0000000000000..21834799ea82f
--- /dev/null
+++ b/clang/tools/cir-translate/CMakeLists.txt
@@ -0,0 +1,35 @@
+get_property(dialect_libs GLOBAL PROPERTY MLIR_DIALECT_LIBS)
+get_property(conversion_libs GLOBAL PROPERTY MLIR_CONVERSION_LIBS)
+get_property(translation_libs GLOBAL PROPERTY MLIR_TRANSLATION_LIBS)
+
+include_directories(${LLVM_MAIN_SRC_DIR}/../mlir/include)
+include_directories(${CMAKE_BINARY_DIR}/tools/mlir/include)
+
+add_clang_tool(cir-translate
+  cir-translate.cpp
+)
+
+clang_target_link_libraries(cir-translate
+  PRIVATE
+  clangCIR
+  clangCIRLoweringDirectToLLVM
+  MLIRCIR
+  MLIRCIRTransforms
+)
+
+target_link_libraries(cir-translate
+  PRIVATE
+  ${dialect_libs}
+  ${conversion_libs}
+  ${translation_libs}
+  MLIRAnalysis
+  MLIRDialect
+  MLIRIR
+  MLIROptLib
+  MLIRParser
+  MLIRPass
+  MLIRTransforms
+  MLIRTransformUtils
+  MLIRTranslateLib
+  MLIRSupport
+)
diff --git a/clang/tools/cir-translate/cir-translate.cpp b/clang/tools/cir-translate/cir-translate.cpp
new file mode 100644
index 0000000000000..fe9fa9dabae4c
--- /dev/null
+++ b/clang/tools/cir-translate/cir-translate.cpp
@@ -0,0 +1,166 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Converts CIR directly to LLVM IR, similar to mlir-translate or LLVM llc.
+//
+//===----------------------------------------------------------------------===//
+
+#include "mlir/Dialect/DLTI/DLTI.h"
+#include "mlir/Dialect/Func/IR/FuncOps.h"
+#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
+#include "mlir/IR/BuiltinOps.h"
+#include "mlir/IR/MLIRContext.h"
+#include "mlir/InitAllTranslations.h"
+#include "mlir/Support/LogicalResult.h"
+#include "mlir/Target/LLVMIR/Dialect/All.h"
+#include "mlir/Target/LLVMIR/Import.h"
+#include "mlir/Tools/mlir-translate/MlirTranslateMain.h"
+#include "mlir/Tools/mlir-translate/Translation.h"
+
+#include "llvm/IR/Module.h"
+#include "llvm/TargetParser/Host.h"
+
+#include "clang/Basic/TargetInfo.h"
+#include "clang/CIR/Dialect/IR/CIRDialect.h"
+#include "clang/CIR/Dialect/Passes.h"
+#include "clang/CIR/LowerToLLVM.h"
+#include "clang/CIR/MissingFeatures.h"
+
+namespace cir {
+namespace direct {
+extern void registerCIRDialectTranslation(mlir::DialectRegistry &registry);
+} // namespace direct
+
+namespace {
+
+/// The goal of this option is to ensure that the triple and data layout specs
+/// are always available in the ClangIR module. With this requirement met, the
+/// behavior of this option is designed to be as intuitive as possible, as shown
+/// in the table below:
+///
+/// +--------+--------+-------------+-----------------+-----------------------+
+/// | Option | Triple | Data Layout | Behavior Triple | Behavior Data Layout  |
+/// +========+========+=============+=================+=======================+
+/// | T      | T      | T           | Overwrite       | Derive from triple    |
+/// | T      | T      | F           | Overwrite       | Derive from triple    |
+/// | T      | F      | T           | Overwrite       | Derive from triple    |
+/// | T      | F      | F           | Overwrite       | Derive from triple    |
+/// | F      | T      | T           |                 |                       |
+/// | F      | T      | F           |                 | Derive from triple    |
+/// | F      | F      | T           | Set default     | Derive from triple    |
+/// | F      | F      | F           | Set default     | Derive from triple    |
+/// +--------+--------+-------------+-----------------+-----------------------+
+llvm::cl::opt<std::string>
+    targetTripleOption("target",
+                       llvm::cl::desc("Specify a default target triple when "
+                                      "it's not available in the module"),
+                       llvm::cl::init(""));
+
+std::string prepareCIRModuleTriple(mlir::ModuleOp mod) {
+  std::string triple = targetTripleOption;
+
+  // Treat "" as the default target machine.
+  if (triple.empty()) {
+    triple = llvm::sys::getDefaultTargetTriple();
+
+    mod.emitWarning() << "no target triple provided, assuming " << triple;
+  }
+
+  mod->setAttr(cir::CIRDialect::getTripleAttrName(),
+               mlir::StringAttr::get(mod.getContext(), triple));
+  return triple;
+}
+
+llvm::LogicalResult prepareCIRModuleDataLayout(mlir::ModuleOp mod,
+                                               llvm::StringRef rawTriple) {
+  auto *context = mod.getContext();
+
+  // Data layout is fully determined by the target triple. Here we only pass the
+  // triple to get the data layout.
+  llvm::Triple triple(rawTriple);
+  clang::TargetOptions targetOptions;
+  targetOptions.Triple = rawTriple;
+  // FIXME: AllocateTarget is a big deal. Better make it a global state.
+  auto targetInfo =
+      clang::targets::AllocateTarget(llvm::Triple(rawTriple), targetOptions);
+  if (!targetInfo) {
+    mod.emitError() << "error: invalid target triple '" << rawTriple << "'\n";
+    return llvm::failure();
+  }
+  std::string layoutString = targetInfo->getDataLayoutString();
+
+  // Registered dialects may not be loaded yet, ensure they are.
+  context->loadDialect<mlir::DLTIDialect, mlir::LLVM::LLVMDialect>();
+
+  mlir::DataLayoutSpecInterface dlSpec =
+      mlir::translateDataLayout(llvm::DataLayout(layoutString), context);
+  mod->setAttr(mlir::DLTIDialect::kDataLayoutAttrName, dlSpec);
+
+  return llvm::success();
+}
+
+/// Prepare requirements like cir.triple and data layout.
+llvm::LogicalResult prepareCIRModuleForTranslation(mlir::ModuleOp mod) {
+  auto modTriple = mod->getAttrOfType<mlir::StringAttr>(
+      cir::CIRDialect::getTripleAttrName());
+  auto modDataLayout = mod->getAttr(mlir::DLTIDialect::kDataLayoutAttrName);
+  bool hasTargetOption = targetTripleOption.getNumOccurrences() > 0;
+
+  // Skip the situation where nothing should be done.
+  if (!hasTargetOption && modTriple && modDataLayout)
+    return llvm::success();
+
+  std::string triple;
+
+  if (!hasTargetOption && modTriple) {
+    // Do nothing if it's already set.
+    triple = modTriple.getValue();
+  } else {
+    // Otherwise, overwrite or set default.
+    triple = prepareCIRModuleTriple(mod);
+  }
+
+  // If the data layout is not set, derive it from the triple.
+  return prepareCIRModuleDataLayout(mod, triple);
+}
+} // namespace
+} // namespace cir
+
+void registerToLLVMTranslation() {
+  static llvm::cl::opt<bool> disableCCLowering(
+      "disable-cc-lowering",
+      llvm::cl::desc("Disable calling convention lowering pass"),
+      llvm::cl::init(false));
+
+  mlir::TranslateFromMLIRRegistration registration(
+      "cir-to-llvmir", "Translate CIR to LLVMIR",
+      [](mlir::Operation *op, mlir::raw_ostream &output) {
+        auto cirModule = llvm::dyn_cast<mlir::ModuleOp>(op);
+
+        if (mlir::failed(cir::prepareCIRModuleForTranslation(cirModule)))
+          return mlir::failure();
+
+        llvm::LLVMContext llvmContext;
+        auto llvmModule =
+            cir::direct::lowerDirectlyFromCIRToLLVMIR(cirModule, llvmContext);
+        if (!llvmModule)
+          return mlir::failure();
+        llvmModule->print(output, nullptr);
+        return mlir::success();
+      },
+      [](mlir::DialectRegistry &registry) {
+        registry.insert<mlir::DLTIDialect, mlir::func::FuncDialect>();
+        mlir::registerAllToLLVMIRTranslations(registry);
+        cir::direct::registerCIRDialectTranslation(registry);
+      });
+}
+
+int main(int argc, char **argv) {
+  registerToLLVMTranslation();
+  return failed(mlir::mlirTranslateMain(argc, argv, "CIR Translation Tool"));
+}

mmha · 2025-03-13T18:19:38Z

clang/tools/cir-translate/cir-translate.cpp

+
+  // Treat "" as the default target machine.
+  if (triple.empty()) {
+    triple = llvm::sys::getDefaultTargetTriple();


This differs from the incubator which defaults to "x86_64-unknown-linux-gnu".

This is a sensible decision/change.

Can we get that changed in incubator as well?

There you go: llvm/clangir#1482

erichkeane · 2025-03-13T18:27:46Z

commit message (PR message) needs to do a vastly better job explaining what is going on here, reasoning, architecture, etc.

clang/tools/cir-lsp-server/CMakeLists.txt

clang/tools/cir-lsp-server/cir-lsp-server.cpp

erichkeane · 2025-03-13T18:32:54Z

clang/tools/cir-translate/cir-translate.cpp

+
+  // Treat "" as the default target machine.
+  if (triple.empty()) {
+    triple = llvm::sys::getDefaultTargetTriple();


This is a sensible decision/change.

clang/tools/cir-translate/cir-translate.cpp

andykaylor · 2025-03-18T16:31:15Z

@erichkeane Are you happy with this now?

erichkeane

Thanks for the ping, didn't realize this was held up by me. LGTM.

…was set explicitly (#1482) This is backported from a change made in llvm/llvm-project#131181 --------- Co-authored-by: Morris Hafner <[email protected]>

…was set explicitly (llvm#1482) This is backported from a change made in llvm/llvm-project#131181 --------- Co-authored-by: Morris Hafner <[email protected]>

…was set explicitly (llvm#1482) This is backported from a change made in llvm#131181 --------- Co-authored-by: Morris Hafner <[email protected]>

mmha added 2 commits March 13, 2025 11:13

[CIR] Add cir-translate tool

5847660

[CIR] Add cir-lsp-server

a613c83

mmha requested review from lanza and bcardosolopes as code owners March 13, 2025 18:18

llvmbot added clang Clang issues not falling into any other category ClangIR Anything related to the ClangIR project labels Mar 13, 2025

mmha commented Mar 13, 2025

View reviewed changes

erichkeane reviewed Mar 13, 2025

View reviewed changes

Replace some uses of auto

f24f231

mmha mentioned this pull request Mar 13, 2025

cir-translate: Use default target triple instead of x86 if no target was set explicitly llvm/clangir#1482

Merged

bcardosolopes approved these changes Mar 17, 2025

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erichkeane approved these changes Mar 18, 2025

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andykaylor merged commit 1ae307a into llvm:main Mar 18, 2025
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mmha commented Mar 13, 2025 •

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llvmbot commented Mar 13, 2025 •

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