init: run a empty "hello oqd world!" capi stub

frontend/catalyst/third_party/oqd/example/6_llvm_ir.ll

@@ -0,0 +1,57 @@
+; ModuleID = 'LLVMDialectModule'
+source_filename = "LLVMDialectModule"
+
+@"{'shots': 1000}" = internal constant [16 x i8] c"{'shots': 1000}\00"
+@oqd = internal constant [4 x i8] c"oqd\00"
+@"/home/paul.wang/catalyst_new/catalyst/frontend/catalyst/utils/../../catalyst/third_party/oqd/src/build/librtd_oqd.so" = internal constant [117 x i8] c"/home/paul.wang/catalyst_new/catalyst/frontend/catalyst/utils/../../catalyst/third_party/oqd/src/build/librtd_oqd.so\00"
+
+declare void @__catalyst__oqd__greetings()
+
+declare void @__catalyst__rt__finalize()
+
+declare void @__catalyst__rt__initialize(ptr)
+
+declare void @__catalyst__rt__device_release()
+
+declare void @__catalyst__rt__device_init(ptr, ptr, ptr, i64)
+
+define void @jit_f() {
+  call void @f_0()
+  ret void
+}
+
+define void @_catalyst_pyface_jit_f(ptr %0, ptr %1) {
+  call void @_catalyst_ciface_jit_f(ptr %0)
+  ret void
+}
+
+define void @_catalyst_ciface_jit_f(ptr %0) {
+  call void @jit_f()
+  ret void
+}
+
+define void @f_0() {
+  call void @__catalyst__rt__device_init(ptr @"/home/paul.wang/catalyst_new/catalyst/frontend/catalyst/utils/../../catalyst/third_party/oqd/src/build/librtd_oqd.so", ptr @oqd, ptr @"{'shots': 1000}", i64 1000)
+  call void @__catalyst__oqd__greetings()
+  call void @__catalyst__rt__device_release()
+  ret void
+}
+
+define void @setup() {
+  call void @__catalyst__rt__initialize(ptr null)
+  ret void
+}
+
+define void @teardown() {
+  call void @__catalyst__rt__finalize()
+  ret void
+}
+
+; Function Attrs: nocallback nofree nounwind willreturn memory(argmem: readwrite)
+declare void @llvm.memcpy.p0.p0.i64(ptr noalias nocapture writeonly, ptr noalias nocapture readonly, i64, i1 immarg) #0
+
+attributes #0 = { nocallback nofree nounwind willreturn memory(argmem: readwrite) }
+
+!llvm.module.flags = !{!0}
+
+!0 = !{i32 2, !"Debug Info Version", i32 3}

frontend/catalyst/third_party/oqd/example/oqd_run.py

@@ -0,0 +1,21 @@
+import pennylane as qml
+import pytest
+
+import catalyst
+from catalyst import qjit
+from catalyst.third_party.oqd import OQDDevice
+from catalyst.debug import get_compilation_stage, replace_ir
+
+dev = OQDDevice(backend="default", shots=1000, wires=8)
+
+@qjit#(keep_intermediate=True)
+@qml.qnode(dev)
+def f():
+    qml.Hadamard(wires=0)
+    return qml.probs()
+
+with open("6_llvm_ir.ll", "r") as file:
+    ir = file.read()
+replace_ir(f, "llvm_ir", ir)
+
+f()

runtime/lib/capi/CMakeLists.txt

@@ -2,7 +2,7 @@
 # Object Lib catalyst_qir_qis_obj
 ##################################
 
-add_library(catalyst_qir_qis_obj OBJECT RuntimeCAPI.cpp)
+add_library(catalyst_qir_qis_obj OBJECT RuntimeCAPI.cpp OQDRuntimeCAPI.cpp)
 
 # include external MLIR runner utils
 FetchContent_MakeAvailable(MLIRRunnerUtils)

runtime/lib/capi/OQDRuntimeCAPI.cpp

@@ -0,0 +1,24 @@
+// Copyright 2025 Xanadu Quantum Technologies Inc.
+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+
+//     http://www.apache.org/licenses/LICENSE-2.0
+
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <iostream>
+
+extern "C" {
+
+void __catalyst__oqd__greetings() {
+	std::cout << "Hello OQD world!" << std::endl;
+}
+
+
+}