[mlir] [llvm] [mlir][EmitC] Add func, call and return operations and conversions (PR #79612)

[Marius Brehler via llvm-commits]

================
@@ -346,6 +349,185 @@ LogicalResult ForOp::verifyRegions() {
 
   return success();
 }
+//===----------------------------------------------------------------------===//
+// CallOp
+//===----------------------------------------------------------------------===//
+
+LogicalResult CallOp::verifySymbolUses(SymbolTableCollection &symbolTable) {
+  // Check that the callee attribute was specified.
+  auto fnAttr = (*this)->getAttrOfType<FlatSymbolRefAttr>("callee");
+  if (!fnAttr)
+    return emitOpError("requires a 'callee' symbol reference attribute");
+  FuncOp fn = symbolTable.lookupNearestSymbolFrom<FuncOp>(*this, fnAttr);
+  if (!fn)
+    return emitOpError() << "'" << fnAttr.getValue()
+                         << "' does not reference a valid function";
+
+  // Verify that the operand and result types match the callee.
+  auto fnType = fn.getFunctionType();
+  if (fnType.getNumInputs() != getNumOperands())
+    return emitOpError("incorrect number of operands for callee");
+
+  for (unsigned i = 0, e = fnType.getNumInputs(); i != e; ++i)
+    if (getOperand(i).getType() != fnType.getInput(i))
+      return emitOpError("operand type mismatch: expected operand type ")
+             << fnType.getInput(i) << ", but provided "
+             << getOperand(i).getType() << " for operand number " << i;
+
+  if (fnType.getNumResults() != getNumResults())
+    return emitOpError("incorrect number of results for callee");
+
+  for (unsigned i = 0, e = fnType.getNumResults(); i != e; ++i)
+    if (getResult(i).getType() != fnType.getResult(i)) {
+      auto diag = emitOpError("result type mismatch at index ") << i;
+      diag.attachNote() << "      op result types: " << getResultTypes();
+      diag.attachNote() << "function result types: " << fnType.getResults();
+      return diag;
+    }
+
+  return success();
+}
+
+FunctionType CallOp::getCalleeType() {
+  return FunctionType::get(getContext(), getOperandTypes(), getResultTypes());
+}
+
+//===----------------------------------------------------------------------===//
+// FuncOp
+//===----------------------------------------------------------------------===//
+
+void FuncOp::build(OpBuilder &builder, OperationState &state, StringRef name,
+                   FunctionType type, ArrayRef<NamedAttribute> attrs,
+                   ArrayRef<DictionaryAttr> argAttrs) {
+  state.addAttribute(SymbolTable::getSymbolAttrName(),
+                     builder.getStringAttr(name));
+  state.addAttribute(getFunctionTypeAttrName(state.name), TypeAttr::get(type));
+  state.attributes.append(attrs.begin(), attrs.end());
+  state.addRegion();
+
+  if (argAttrs.empty())
+    return;
+  assert(type.getNumInputs() == argAttrs.size());
+  function_interface_impl::addArgAndResultAttrs(
+      builder, state, argAttrs, /*resultAttrs=*/std::nullopt,
+      getArgAttrsAttrName(state.name), getResAttrsAttrName(state.name));
+}
+
+ParseResult FuncOp::parse(OpAsmParser &parser, OperationState &result) {
+  auto buildFuncType =
+      [](Builder &builder, ArrayRef<Type> argTypes, ArrayRef<Type> results,
+         function_interface_impl::VariadicFlag,
+         std::string &) { return builder.getFunctionType(argTypes, results); };
+
+  return function_interface_impl::parseFunctionOp(
+      parser, result, /*allowVariadic=*/false,
+      getFunctionTypeAttrName(result.name), buildFuncType,
+      getArgAttrsAttrName(result.name), getResAttrsAttrName(result.name));
+}
+
+void FuncOp::print(OpAsmPrinter &p) {
+  function_interface_impl::printFunctionOp(
+      p, *this, /*isVariadic=*/false, getFunctionTypeAttrName(),
+      getArgAttrsAttrName(), getResAttrsAttrName());
+}
+
+/// Clone the internal blocks from this function into dest and all attributes
+/// from this function to dest.
+void FuncOp::cloneInto(FuncOp dest, IRMapping &mapper) {
+  // Add the attributes of this function to dest.
+  llvm::MapVector<StringAttr, Attribute> newAttrMap;
+  for (const auto &attr : dest->getAttrs())
+    newAttrMap.insert({attr.getName(), attr.getValue()});
+  for (const auto &attr : (*this)->getAttrs())
+    newAttrMap.insert({attr.getName(), attr.getValue()});
+
+  auto newAttrs = llvm::to_vector(llvm::map_range(
+      newAttrMap, [](std::pair<StringAttr, Attribute> attrPair) {
+        return NamedAttribute(attrPair.first, attrPair.second);
+      }));
+  dest->setAttrs(DictionaryAttr::get(getContext(), newAttrs));
+
+  // Clone the body.
+  getBody().cloneInto(&dest.getBody(), mapper);
+}
+
+/// Create a deep copy of this function and all of its blocks, remapping
+/// any operands that use values outside of the function using the map that is
+/// provided (leaving them alone if no entry is present). Replaces references
+/// to cloned sub-values with the corresponding value that is copied, and adds
+/// those mappings to the mapper.
+FuncOp FuncOp::clone(IRMapping &mapper) {
----------------
marbre wrote:

Not yet and these *were* indeed copies from the Func dialect. I removed the clone methods for now and we can implement (and test) those if wer later have a use for this functionality.

https://github.com/llvm/llvm-project/pull/79612