xref: /llvm-project/mlir/lib/Transforms/SymbolPrivatize.cpp (revision 67d0d7ac0acb0665d6a09f61278fbcf51f0114c2)
1 //===- SymbolPrivatize.cpp - Pass to mark symbols private -----------------===//
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 // This file implements an pass that marks all symbols as private unless
10 // excluded.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "mlir/Transforms/Passes.h"
15 
16 #include "mlir/IR/SymbolTable.h"
17 
18 namespace mlir {
19 #define GEN_PASS_DEF_SYMBOLPRIVATIZE
20 #include "mlir/Transforms/Passes.h.inc"
21 } // namespace mlir
22 
23 using namespace mlir;
24 
25 namespace {
26 struct SymbolPrivatize : public impl::SymbolPrivatizeBase<SymbolPrivatize> {
27   explicit SymbolPrivatize(ArrayRef<std::string> excludeSymbols);
28   LogicalResult initialize(MLIRContext *context) override;
29   void runOnOperation() override;
30 
31   /// Symbols whose visibility won't be changed.
32   DenseSet<StringAttr> excludedSymbols;
33 };
34 } // namespace
35 
SymbolPrivatize(llvm::ArrayRef<std::string> excludeSymbols)36 SymbolPrivatize::SymbolPrivatize(llvm::ArrayRef<std::string> excludeSymbols) {
37   exclude = excludeSymbols;
38 }
39 
initialize(MLIRContext * context)40 LogicalResult SymbolPrivatize::initialize(MLIRContext *context) {
41   for (const std::string &symbol : exclude)
42     excludedSymbols.insert(StringAttr::get(context, symbol));
43   return success();
44 }
45 
runOnOperation()46 void SymbolPrivatize::runOnOperation() {
47   for (Region &region : getOperation()->getRegions()) {
48     for (Block &block : region) {
49       for (Operation &op : block) {
50         auto symbol = dyn_cast<SymbolOpInterface>(op);
51         if (!symbol)
52           continue;
53         if (!excludedSymbols.contains(symbol.getNameAttr()))
54           symbol.setVisibility(SymbolTable::Visibility::Private);
55       }
56     }
57   }
58 }
59 
60 std::unique_ptr<Pass>
createSymbolPrivatizePass(ArrayRef<std::string> exclude)61 mlir::createSymbolPrivatizePass(ArrayRef<std::string> exclude) {
62   return std::make_unique<SymbolPrivatize>(exclude);
63 }
64