[mlir][llvmir] expose Type(To/From)LLVMIRTranslator C API

mlir/include/mlir-c/Target/LLVMIR.h

@@ -32,6 +32,21 @@ extern "C" {
 MLIR_CAPI_EXPORTED LLVMModuleRef
 mlirTranslateModuleToLLVMIR(MlirOperation module, LLVMContextRef context);
 
+struct MlirTypeFromLLVMIRTranslator {
+  void *ptr;
+};
+
+typedef struct MlirTypeFromLLVMIRTranslator MlirTypeFromLLVMIRTranslator;
+
+MLIR_CAPI_EXPORTED MlirTypeFromLLVMIRTranslator
+mlirTypeFromLLVMIRTranslatorCreate(MlirContext ctx);
+
+MLIR_CAPI_EXPORTED MlirTypeFromLLVMIRTranslator
+mlirTypeFromLLVMIRTranslatorCreate(MlirContext ctx);
+
+MLIR_CAPI_EXPORTED MlirType mlirTypeFromLLVMIRTranslatorTranslateType(
+    MlirTypeFromLLVMIRTranslator translator, LLVMTypeRef llvmType);
+
 #ifdef __cplusplus
 }
 #endif

mlir/lib/CAPI/Target/LLVMIR.cpp

@@ -8,16 +8,15 @@
 //===----------------------------------------------------------------------===//
 
 #include "mlir-c/Target/LLVMIR.h"
-#include "llvm-c/Support.h"
 
 #include "llvm/IR/LLVMContext.h"
 #include "llvm/IR/Module.h"
-#include <memory>
+#include "llvm/IR/Type.h"
 
 #include "mlir/CAPI/IR.h"
-#include "mlir/CAPI/Support.h"
 #include "mlir/CAPI/Wrap.h"
 #include "mlir/Target/LLVMIR/ModuleTranslation.h"
+#include "mlir/Target/LLVMIR/TypeFromLLVM.h"
 
 using namespace mlir;
 
@@ -34,3 +33,20 @@ LLVMModuleRef mlirTranslateModuleToLLVMIR(MlirOperation module,
 
   return moduleRef;
 }
+
+DEFINE_C_API_PTR_METHODS(MlirTypeFromLLVMIRTranslator,
+                         mlir::LLVM::TypeFromLLVMIRTranslator);
+
+MlirTypeFromLLVMIRTranslator
+mlirTypeFromLLVMIRTranslatorCreate(MlirContext ctx) {
+  MLIRContext *context = unwrap(ctx);
+  auto *translator = new LLVM::TypeFromLLVMIRTranslator(*context);
+  return wrap(translator);
+}
+
+MlirType mlirTypeFromLLVMIRTranslatorTranslateType(
+    MlirTypeFromLLVMIRTranslator translator, LLVMTypeRef llvmType) {
+  LLVM::TypeFromLLVMIRTranslator *translator_ = unwrap(translator);
+  mlir::Type type = translator_->translateType(llvm::unwrap(llvmType));
+  return wrap(type);
+}

mlir/test/CAPI/translation.c

@@ -58,11 +58,28 @@ static void testToLLVMIR(MlirContext ctx) {
   LLVMContextDispose(llvmCtx);
 }
 
+// CHECK-LABEL: testTypeFromLLVMIRTranslator
+static void testTypeFromLLVMIRTranslator(MlirContext ctx) {
+  fprintf(stderr, "testTypeFromLLVMIRTranslator\n");
+  LLVMContextRef llvmCtx = LLVMContextCreate();
+
+  LLVMTypeRef llvmTy = LLVMInt32TypeInContext(llvmCtx);
+  MlirTypeFromLLVMIRTranslator translator =
+      mlirTypeFromLLVMIRTranslatorCreate(ctx);
+  MlirType mlirTy =
+      mlirTypeFromLLVMIRTranslatorTranslateType(translator, llvmTy);
+  // CHECK: i32
+  mlirTypeDump(mlirTy);
+
+  LLVMContextDispose(llvmCtx);
+}
+
 int main(void) {
   MlirContext ctx = mlirContextCreate();
   mlirDialectHandleRegisterDialect(mlirGetDialectHandle__llvm__(), ctx);
   mlirContextGetOrLoadDialect(ctx, mlirStringRefCreateFromCString("llvm"));
   testToLLVMIR(ctx);
+  testTypeFromLLVMIRTranslator(ctx);
   mlirContextDestroy(ctx);
   return 0;
 }