1 //===- Inliner.cpp - Pass to inline function calls ------------------------===//
2 //
3 // Copyright 2019 The MLIR Authors.
4 //
5 // Licensed under the Apache License, Version 2.0 (the "License");
6 // you may not use this file except in compliance with the License.
7 // You may obtain a copy of the License at
8 //
9 //   http://www.apache.org/licenses/LICENSE-2.0
10 //
11 // Unless required by applicable law or agreed to in writing, software
12 // distributed under the License is distributed on an "AS IS" BASIS,
13 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 // See the License for the specific language governing permissions and
15 // limitations under the License.
16 // =============================================================================
17 
18 #include "mlir/Dialect/StandardOps/Ops.h"
19 #include "mlir/IR/Builders.h"
20 #include "mlir/IR/Function.h"
21 #include "mlir/IR/Module.h"
22 #include "mlir/Pass/Pass.h"
23 #include "mlir/Transforms/InliningUtils.h"
24 #include "mlir/Transforms/Passes.h"
25 #include "llvm/ADT/StringSet.h"
26 
27 using namespace mlir;
28 
29 // TODO(riverriddle) This pass should currently only be used for basic testing
30 // of inlining functionality.
31 namespace {
32 struct Inliner : public ModulePass<Inliner> {
33   void runOnModule() override {
34     auto module = getModule();
35 
36     // Collect each of the direct function calls within the module.
37     SmallVector<CallOp, 16> callOps;
38     for (auto &f : module)
39       f.walk([&](CallOp callOp) { callOps.push_back(callOp); });
40 
41     // Build the inliner interface.
42     InlinerInterface interface(&getContext());
43 
44     // Try to inline each of the call operations.
45     for (auto &call : callOps) {
46       if (failed(inlineFunction(
47               interface, module.lookupSymbol<FuncOp>(call.getCallee()), call,
48               llvm::to_vector<8>(call.getArgOperands()),
49               llvm::to_vector<8>(call.getResults()), call.getLoc())))
50         continue;
51 
52       // If the inlining was successful then erase the call.
53       call.erase();
54     }
55   }
56 };
57 } // end anonymous namespace
58 
59 static PassRegistration<Inliner> pass("inline", "Inline function calls");
60