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/Func/IR/FuncOps.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   MLIR_DEFINE_EXPLICIT_INTERNAL_INLINE_TYPE_ID(Inliner)
29 
30   StringRef getArgument() const final { return "test-inline"; }
31   StringRef getDescription() const final {
32     return "Test inlining region calls";
33   }
34 
35   void runOnOperation() override {
36     auto function = getOperation();
37 
38     // Collect each of the direct function calls within the module.
39     SmallVector<func::CallIndirectOp, 16> callers;
40     function.walk(
41         [&](func::CallIndirectOp caller) { callers.push_back(caller); });
42 
43     // Build the inliner interface.
44     InlinerInterface interface(&getContext());
45 
46     // Try to inline each of the call operations.
47     for (auto caller : callers) {
48       auto callee = dyn_cast_or_null<FunctionalRegionOp>(
49           caller.getCallee().getDefiningOp());
50       if (!callee)
51         continue;
52 
53       // Inline the functional region operation, but only clone the internal
54       // region if there is more than one use.
55       if (failed(inlineRegion(
56               interface, &callee.getBody(), caller, caller.getArgOperands(),
57               caller.getResults(), caller.getLoc(),
58               /*shouldCloneInlinedRegion=*/!callee.getResult().hasOneUse())))
59         continue;
60 
61       // If the inlining was successful then erase the call and callee if
62       // possible.
63       caller.erase();
64       if (callee.use_empty())
65         callee.erase();
66     }
67   }
68 };
69 } // namespace
70 
71 namespace mlir {
72 namespace test {
73 void registerInliner() { PassRegistration<Inliner>(); }
74 } // namespace test
75 } // namespace mlir
76