1 files changed, 0 insertions, 294 deletions
diff --git a/gnu/llvm/lib/Transforms/IPO/Internalize.cpp b/gnu/llvm/lib/Transforms/IPO/Internalize.cpp
deleted file mode 100644
index a6542d28dfd..00000000000
--- a/gnu/llvm/lib/Transforms/IPO/Internalize.cpp
+++ /dev/null
@@ -1,294 +0,0 @@
-//===-- Internalize.cpp - Mark functions internal -------------------------===//
-//
-//                     The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This pass loops over all of the functions and variables in the input module.
-// If the function or variable does not need to be preserved according to the
-// client supplied callback, it is marked as internal.
-//
-// This transformation would not be legal in a regular compilation, but it gets
-// extra information from the linker about what is safe.
-//
-// For example: Internalizing a function with external linkage. Only if we are
-// told it is only used from within this module, it is safe to do it.
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Transforms/IPO/Internalize.h"
-#include "llvm/ADT/SmallPtrSet.h"
-#include "llvm/ADT/Statistic.h"
-#include "llvm/ADT/StringSet.h"
-#include "llvm/Analysis/CallGraph.h"
-#include "llvm/IR/Module.h"
-#include "llvm/Pass.h"
-#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/Debug.h"
-#include "llvm/Support/raw_ostream.h"
-#include "llvm/Transforms/IPO.h"
-#include "llvm/Transforms/Utils/GlobalStatus.h"
-#include <fstream>
-#include <set>
-using namespace llvm;
-
-#define DEBUG_TYPE "internalize"
-
-STATISTIC(NumAliases, "Number of aliases internalized");
-STATISTIC(NumFunctions, "Number of functions internalized");
-STATISTIC(NumGlobals, "Number of global vars internalized");
-
-// APIFile - A file which contains a list of symbols that should not be marked
-// external.
-static cl::opt<std::string>
-    APIFile("internalize-public-api-file", cl::value_desc("filename"),
-            cl::desc("A file containing list of symbol names to preserve"));
-
-// APIList - A list of symbols that should not be marked internal.
-static cl::list<std::string>
-    APIList("internalize-public-api-list", cl::value_desc("list"),
-            cl::desc("A list of symbol names to preserve"), cl::CommaSeparated);
-
-namespace {
-// Helper to load an API list to preserve from file and expose it as a functor
-// for internalization.
-class PreserveAPIList {
-public:
-  PreserveAPIList() {
-    if (!APIFile.empty())
-      LoadFile(APIFile);
-    ExternalNames.insert(APIList.begin(), APIList.end());
-  }
-
-  bool operator()(const GlobalValue &GV) {
-    return ExternalNames.count(GV.getName());
-  }
-
-private:
-  // Contains the set of symbols loaded from file
-  StringSet<> ExternalNames;
-
-  void LoadFile(StringRef Filename) {
-    // Load the APIFile...
-    std::ifstream In(Filename.data());
-    if (!In.good()) {
-      errs() << "WARNING: Internalize couldn't load file '" << Filename
-             << "'! Continuing as if it's empty.\n";
-      return; // Just continue as if the file were empty
-    }
-    while (In) {
-      std::string Symbol;
-      In >> Symbol;
-      if (!Symbol.empty())
-        ExternalNames.insert(Symbol);
-    }
-  }
-};
-} // end anonymous namespace
-
-bool InternalizePass::shouldPreserveGV(const GlobalValue &GV) {
-  // Function must be defined here
-  if (GV.isDeclaration())
-    return true;
-
-  // Available externally is really just a "declaration with a body".
-  if (GV.hasAvailableExternallyLinkage())
-    return true;
-
-  // Assume that dllexported symbols are referenced elsewhere
-  if (GV.hasDLLExportStorageClass())
-    return true;
-
-  // Already local, has nothing to do.
-  if (GV.hasLocalLinkage())
-    return false;
-
-  // Check some special cases
-  if (AlwaysPreserved.count(GV.getName()))
-    return true;
-
-  return MustPreserveGV(GV);
-}
-
-bool InternalizePass::maybeInternalize(
-    GlobalValue &GV, const std::set<const Comdat *> &ExternalComdats) {
-  if (Comdat *C = GV.getComdat()) {
-    if (ExternalComdats.count(C))
-      return false;
-
-    // If a comdat is not externally visible we can drop it.
-    if (auto GO = dyn_cast<GlobalObject>(&GV))
-      GO->setComdat(nullptr);
-
-    if (GV.hasLocalLinkage())
-      return false;
-  } else {
-    if (GV.hasLocalLinkage())
-      return false;
-
-    if (shouldPreserveGV(GV))
-      return false;
-  }
-
-  GV.setVisibility(GlobalValue::DefaultVisibility);
-  GV.setLinkage(GlobalValue::InternalLinkage);
-  return true;
-}
-
-// If GV is part of a comdat and is externally visible, keep track of its
-// comdat so that we don't internalize any of its members.
-void InternalizePass::checkComdatVisibility(
-    GlobalValue &GV, std::set<const Comdat *> &ExternalComdats) {
-  Comdat *C = GV.getComdat();
-  if (!C)
-    return;
-
-  if (shouldPreserveGV(GV))
-    ExternalComdats.insert(C);
-}
-
-bool InternalizePass::internalizeModule(Module &M, CallGraph *CG) {
-  bool Changed = false;
-  CallGraphNode *ExternalNode = CG ? CG->getExternalCallingNode() : nullptr;
-
-  SmallPtrSet<GlobalValue *, 8> Used;
-  collectUsedGlobalVariables(M, Used, false);
-
-  // Collect comdat visiblity information for the module.
-  std::set<const Comdat *> ExternalComdats;
-  if (!M.getComdatSymbolTable().empty()) {
-    for (Function &F : M)
-      checkComdatVisibility(F, ExternalComdats);
-    for (GlobalVariable &GV : M.globals())
-      checkComdatVisibility(GV, ExternalComdats);
-    for (GlobalAlias &GA : M.aliases())
-      checkComdatVisibility(GA, ExternalComdats);
-  }
-
-  // We must assume that globals in llvm.used have a reference that not even
-  // the linker can see, so we don't internalize them.
-  // For llvm.compiler.used the situation is a bit fuzzy. The assembler and
-  // linker can drop those symbols. If this pass is running as part of LTO,
-  // one might think that it could just drop llvm.compiler.used. The problem
-  // is that even in LTO llvm doesn't see every reference. For example,
-  // we don't see references from function local inline assembly. To be
-  // conservative, we internalize symbols in llvm.compiler.used, but we
-  // keep llvm.compiler.used so that the symbol is not deleted by llvm.
-  for (GlobalValue *V : Used) {
-    AlwaysPreserved.insert(V->getName());
-  }
-
-  // Mark all functions not in the api as internal.
-  for (Function &I : M) {
-    if (!maybeInternalize(I, ExternalComdats))
-      continue;
-    Changed = true;
-
-    if (ExternalNode)
-      // Remove a callgraph edge from the external node to this function.
-      ExternalNode->removeOneAbstractEdgeTo((*CG)[&I]);
-
-    ++NumFunctions;
-    LLVM_DEBUG(dbgs() << "Internalizing func " << I.getName() << "\n");
-  }
-
-  // Never internalize the llvm.used symbol.  It is used to implement
-  // attribute((used)).
-  // FIXME: Shouldn't this just filter on llvm.metadata section??
-  AlwaysPreserved.insert("llvm.used");
-  AlwaysPreserved.insert("llvm.compiler.used");
-
-  // Never internalize anchors used by the machine module info, else the info
-  // won't find them.  (see MachineModuleInfo.)
-  AlwaysPreserved.insert("llvm.global_ctors");
-  AlwaysPreserved.insert("llvm.global_dtors");
-  AlwaysPreserved.insert("llvm.global.annotations");
-
-  // Never internalize symbols code-gen inserts.
-  // FIXME: We should probably add this (and the __stack_chk_guard) via some
-  // type of call-back in CodeGen.
-  AlwaysPreserved.insert("__stack_chk_fail");
-  AlwaysPreserved.insert("__stack_chk_guard");
-
-  // Mark all global variables with initializers that are not in the api as
-  // internal as well.
-  for (auto &GV : M.globals()) {
-    if (!maybeInternalize(GV, ExternalComdats))
-      continue;
-    Changed = true;
-
-    ++NumGlobals;
-    LLVM_DEBUG(dbgs() << "Internalized gvar " << GV.getName() << "\n");
-  }
-
-  // Mark all aliases that are not in the api as internal as well.
-  for (auto &GA : M.aliases()) {
-    if (!maybeInternalize(GA, ExternalComdats))
-      continue;
-    Changed = true;
-
-    ++NumAliases;
-    LLVM_DEBUG(dbgs() << "Internalized alias " << GA.getName() << "\n");
-  }
-
-  return Changed;
-}
-
-InternalizePass::InternalizePass() : MustPreserveGV(PreserveAPIList()) {}
-
-PreservedAnalyses InternalizePass::run(Module &M, ModuleAnalysisManager &AM) {
-  if (!internalizeModule(M, AM.getCachedResult<CallGraphAnalysis>(M)))
-    return PreservedAnalyses::all();
-
-  PreservedAnalyses PA;
-  PA.preserve<CallGraphAnalysis>();
-  return PA;
-}
-
-namespace {
-class InternalizeLegacyPass : public ModulePass {
-  // Client supplied callback to control wheter a symbol must be preserved.
-  std::function<bool(const GlobalValue &)> MustPreserveGV;
-
-public:
-  static char ID; // Pass identification, replacement for typeid
-
-  InternalizeLegacyPass() : ModulePass(ID), MustPreserveGV(PreserveAPIList()) {}
-
-  InternalizeLegacyPass(std::function<bool(const GlobalValue &)> MustPreserveGV)
-      : ModulePass(ID), MustPreserveGV(std::move(MustPreserveGV)) {
-    initializeInternalizeLegacyPassPass(*PassRegistry::getPassRegistry());
-  }
-
-  bool runOnModule(Module &M) override {
-    if (skipModule(M))
-      return false;
-
-    CallGraphWrapperPass *CGPass =
-        getAnalysisIfAvailable<CallGraphWrapperPass>();
-    CallGraph *CG = CGPass ? &CGPass->getCallGraph() : nullptr;
-    return internalizeModule(M, MustPreserveGV, CG);
-  }
-
-  void getAnalysisUsage(AnalysisUsage &AU) const override {
-    AU.setPreservesCFG();
-    AU.addPreserved<CallGraphWrapperPass>();
-  }
-};
-}
-
-char InternalizeLegacyPass::ID = 0;
-INITIALIZE_PASS(InternalizeLegacyPass, "internalize",
-                "Internalize Global Symbols", false, false)
-
-ModulePass *llvm::createInternalizePass() {
-  return new InternalizeLegacyPass();
-}
-
-ModulePass *llvm::createInternalizePass(
-    std::function<bool(const GlobalValue &)> MustPreserveGV) {
-  return new InternalizeLegacyPass(std::move(MustPreserveGV));
-}