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 static bool isValidDSOLocalReductionGV(GlobalValue &GV) {
21   return GV.isDSOLocal() && !GV.isImplicitDSOLocal();
22 }
23 
24 /// Sets dso_local to false for all global values.
25 static void extractGVsFromModule(Oracle &O, Module &Program) {
26   // remove dso_local from global values
27   for (auto &GV : Program.global_values())
28     if (isValidDSOLocalReductionGV(GV) && !O.shouldKeep()) {
29       GV.setDSOLocal(false);
30     }
31 }
32 
33 /// Counts the amount of global values with dso_local and displays their
34 /// respective name & index
35 static int countGVs(Module &Program) {
36   // TODO: Silence index with --quiet flag
37   outs() << "----------------------------\n";
38   outs() << "GlobalValue Index Reference:\n";
39   int GVCount = 0;
40   for (auto &GV : Program.global_values())
41     if (isValidDSOLocalReductionGV(GV))
42       outs() << "\t" << ++GVCount << ": " << GV.getName() << "\n";
43   outs() << "----------------------------\n";
44   return GVCount;
45 }
46 
47 void llvm::reduceGlobalValuesDeltaPass(TestRunner &Test) {
48   outs() << "*** Reducing GlobalValues...\n";
49   int GVCount = countGVs(Test.getProgram());
50   runDeltaPass(Test, GVCount, extractGVsFromModule);
51 }
52