1 //===- ReduceGlobalValues.cpp - Specialized Delta Pass --------------------===//
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 a function which calls the Generic Delta pass to reduce
10 // global value attributes/specifiers.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "ReduceGlobalValues.h"
15 #include "llvm/IR/Constants.h"
16 #include "llvm/IR/GlobalValue.h"
17 
18 using namespace llvm;
19 
20 /// Sets dso_local to false for all global values.
21 static void extractGVsFromModule(std::vector<Chunk> ChunksToKeep,
22                                  Module *Program) {
23   Oracle O(ChunksToKeep);
24 
25   // remove dso_local from global values
26   for (auto &GV : Program->global_values())
27     if (GV.isDSOLocal() && !O.shouldKeep()) {
28       GV.setDSOLocal(false);
29     }
30 }
31 
32 /// Counts the amount of global values with dso_local and displays their
33 /// respective name & index
34 static int countGVs(Module *Program) {
35   // TODO: Silence index with --quiet flag
36   outs() << "----------------------------\n";
37   outs() << "GlobalValue Index Reference:\n";
38   int GVCount = 0;
39   for (auto &GV : Program->global_values())
40     if (GV.isDSOLocal())
41       outs() << "\t" << ++GVCount << ": " << GV.getName() << "\n";
42   outs() << "----------------------------\n";
43   return GVCount;
44 }
45 
46 void llvm::reduceGlobalValuesDeltaPass(TestRunner &Test) {
47   outs() << "*** Reducing GlobalValues...\n";
48   int GVCount = countGVs(Test.getProgram());
49   runDeltaPass(Test, GVCount, extractGVsFromModule);
50 }
51