1 //===- TestInlining.cpp - Pass to inline calls in the test dialect --------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // TODO: This pass is only necessary because the main inlining pass
10 // has no abstracted away the call+callee relationship. When the inlining
11 // interface has this support, this pass should be removed.
12 //
13 //===----------------------------------------------------------------------===//
14 
15 #include "TestDialect.h"
16 #include "mlir/Dialect/StandardOps/IR/Ops.h"
17 #include "mlir/IR/BlockAndValueMapping.h"
18 #include "mlir/IR/BuiltinOps.h"
19 #include "mlir/Pass/Pass.h"
20 #include "mlir/Transforms/InliningUtils.h"
21 #include "llvm/ADT/StringSet.h"
22 
23 using namespace mlir;
24 using namespace test;
25 
26 namespace {
27 struct Inliner : public PassWrapper<Inliner, OperationPass<FuncOp>> {
28   StringRef getArgument() const final { return "test-inline"; }
29   StringRef getDescription() const final {
30     return "Test inlining region calls";
31   }
32 
33   void runOnOperation() override {
34     auto function = getOperation();
35 
36     // Collect each of the direct function calls within the module.
37     SmallVector<CallIndirectOp, 16> callers;
38     function.walk([&](CallIndirectOp caller) { callers.push_back(caller); });
39 
40     // Build the inliner interface.
41     InlinerInterface interface(&getContext());
42 
43     // Try to inline each of the call operations.
44     for (auto caller : callers) {
45       auto callee = dyn_cast_or_null<FunctionalRegionOp>(
46           caller.getCallee().getDefiningOp());
47       if (!callee)
48         continue;
49 
50       // Inline the functional region operation, but only clone the internal
51       // region if there is more than one use.
52       if (failed(inlineRegion(
53               interface, &callee.getBody(), caller, caller.getArgOperands(),
54               caller.getResults(), caller.getLoc(),
55               /*shouldCloneInlinedRegion=*/!callee.getResult().hasOneUse())))
56         continue;
57 
58       // If the inlining was successful then erase the call and callee if
59       // possible.
60       caller.erase();
61       if (callee.use_empty())
62         callee.erase();
63     }
64   }
65 };
66 } // namespace
67 
68 namespace mlir {
69 namespace test {
70 void registerInliner() { PassRegistration<Inliner>(); }
71 } // namespace test
72 } // namespace mlir
73