llvm/tools/llvm-reduce/deltas/ReduceGlobalValues.cpp

   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/GlobalValue.h"
  16
  17 using namespace llvm;
  18
  19 static bool shouldReduceDSOLocal(GlobalValue &GV) {
  20   return GV.isDSOLocal() && !GV.isImplicitDSOLocal();
  21 }
  22
  23 static bool shouldReduceVisibility(GlobalValue &GV) {
  24   return GV.getVisibility() != GlobalValue::VisibilityTypes::DefaultVisibility;
  25 }
  26
  27 static bool shouldReduceUnnamedAddress(GlobalValue &GV) {
  28   return GV.getUnnamedAddr() != GlobalValue::UnnamedAddr::None;
  29 }
  30
  31 static bool shouldReduceDLLStorageClass(GlobalValue &GV) {
  32   return GV.getDLLStorageClass() !=
  33          GlobalValue::DLLStorageClassTypes::DefaultStorageClass;
  34 }
  35
  36 static bool shouldReduceThreadLocal(GlobalValue &GV) {
  37   return GV.isThreadLocal();
  38 }
  39
  40 static bool shouldReduceLinkage(GlobalValue &GV) {
  41   return !GV.hasExternalLinkage();
  42 }
  43
  44 static void reduceGVs(Oracle &O, ReducerWorkItem &Program) {
  45   for (auto &GV : Program.getModule().global_values()) {
  46     if (shouldReduceDSOLocal(GV) && !O.shouldKeep())
  47       GV.setDSOLocal(false);
  48     if (shouldReduceVisibility(GV) && !O.shouldKeep()) {
  49       bool IsImplicitDSOLocal = GV.isImplicitDSOLocal();
  50       GV.setVisibility(GlobalValue::VisibilityTypes::DefaultVisibility);
  51       if (IsImplicitDSOLocal)
  52         GV.setDSOLocal(false);
  53     }
  54     if (shouldReduceUnnamedAddress(GV) && !O.shouldKeep())
  55       GV.setUnnamedAddr(GlobalValue::UnnamedAddr::None);
  56     if (shouldReduceDLLStorageClass(GV) && !O.shouldKeep())
  57       GV.setDLLStorageClass(
  58           GlobalValue::DLLStorageClassTypes::DefaultStorageClass);
  59     if (shouldReduceThreadLocal(GV) && !O.shouldKeep())
  60       GV.setThreadLocal(false);
  61     if (shouldReduceLinkage(GV) && !O.shouldKeep()) {
  62       bool IsImplicitDSOLocal = GV.isImplicitDSOLocal();
  63       GV.setLinkage(GlobalValue::ExternalLinkage);
  64       if (IsImplicitDSOLocal)
  65         GV.setDSOLocal(false);
  66     }
  67   }
  68 }
  69
  70 void llvm::reduceGlobalValuesDeltaPass(TestRunner &Test) {
  71   runDeltaPass(Test, reduceGVs, "Reducing GlobalValues");
  72 }