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📄 AssumeBundleBuilder.h(2.29 KB)
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📄 BuildLibCalls.h(9.67 KB)
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📄 CanonicalizeAliases.h(998 B)
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📄 EntryExitInstrumenter.h(1.16 KB)
📄 EscapeEnumerator.h(1.56 KB)
📄 Evaluator.h(4.69 KB)
📄 FunctionComparator.h(17.12 KB)
📄 FunctionImportUtils.h(5.73 KB)
📄 GlobalStatus.h(2.97 KB)
📄 GuardUtils.h(1.92 KB)
📄 ImportedFunctionsInliningStatistics.h(4.35 KB)
📄 InjectTLIMappings.h(1.27 KB)
📄 IntegerDivision.h(2.88 KB)
📄 LCSSA.h(1.56 KB)
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📄 ModuleUtils.h(5.04 KB)
📄 NameAnonGlobals.h(1.03 KB)
📄 PredicateInfo.h(7.76 KB)
📄 PromoteMemToReg.h(1.57 KB)
📄 SSAUpdater.h(6.12 KB)
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📄 SanitizerStats.h(1.53 KB)
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📄 SimplifyIndVar.h(2.12 KB)
📄 SimplifyLibCalls.h(10.85 KB)
📄 SizeOpts.h(4.84 KB)
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📄 SymbolRewriter.h(5.02 KB)
📄 UnifyFunctionExitNodes.h(1.83 KB)
📄 UniqueInternalLinkageNames.h(1.07 KB)
📄 UnrollLoop.h(6.05 KB)
📄 VNCoercion.h(4.99 KB)
📄 ValueMapper.h(11.67 KB)

Editing: FunctionImportUtils.h

//===- FunctionImportUtils.h - Importing support utilities -----*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines the FunctionImportGlobalProcessing class which is used
// to perform the necessary global value handling for function importing.
//
//===----------------------------------------------------------------------===//

#ifndef LLVM_TRANSFORMS_UTILS_FUNCTIONIMPORTUTILS_H
#define LLVM_TRANSFORMS_UTILS_FUNCTIONIMPORTUTILS_H

#include "llvm/ADT/SetVector.h"
#include "llvm/IR/ModuleSummaryIndex.h"

namespace llvm {
class Module;

/// Class to handle necessary GlobalValue changes required by ThinLTO
/// function importing, including linkage changes and any necessary renaming.
class FunctionImportGlobalProcessing {
  /// The Module which we are exporting or importing functions from.
  Module &M;

/// Module summary index passed in for function importing/exporting handling.
  const ModuleSummaryIndex &ImportIndex;

/// Globals to import from this module, all other functions will be
  /// imported as declarations instead of definitions.
  SetVector<GlobalValue *> *GlobalsToImport;

/// Set to true if the given ModuleSummaryIndex contains any functions
  /// from this source module, in which case we must conservatively assume
  /// that any of its functions may be imported into another module
  /// as part of a different backend compilation process.
  bool HasExportedFunctions = false;

/// Set to true (only applicatable to ELF -fpic) if dso_local should be
  /// dropped for a declaration.
  ///
  /// On ELF, the assembler is conservative and assumes a global default
  /// visibility symbol can be interposable. No direct access relocation is
  /// allowed, if the definition is not in the translation unit, even if the
  /// definition is available in the linkage unit. Thus we need to clear
  /// dso_local to disable direct access.
  ///
  /// This flag should not be set for -fno-pic or -fpie, which would
  /// unnecessarily disable direct access.
  bool ClearDSOLocalOnDeclarations;

/// Set of llvm.*used values, in order to validate that we don't try
  /// to promote any non-renamable values.
  SmallPtrSet<GlobalValue *, 8> Used;

/// Keep track of any COMDATs that require renaming (because COMDAT
  /// leader was promoted and renamed). Maps from original COMDAT to one
  /// with new name.
  DenseMap<const Comdat *, Comdat *> RenamedComdats;

/// Check if we should promote the given local value to global scope.
  bool shouldPromoteLocalToGlobal(const GlobalValue *SGV, ValueInfo VI);

#ifndef NDEBUG
  /// Check if the given value is a local that can't be renamed (promoted).
  /// Only used in assertion checking, and disabled under NDEBUG since the Used
  /// set will not be populated.
  bool isNonRenamableLocal(const GlobalValue &GV) const;
#endif

/// Helper methods to check if we are importing from or potentially
  /// exporting from the current source module.
  bool isPerformingImport() const { return GlobalsToImport != nullptr; }
  bool isModuleExporting() const { return HasExportedFunctions; }

/// If we are importing from the source module, checks if we should
  /// import SGV as a definition, otherwise import as a declaration.
  bool doImportAsDefinition(const GlobalValue *SGV);

/// Get the name for a local SGV that should be promoted and renamed to global
  /// scope in the linked destination module.
  std::string getPromotedName(const GlobalValue *SGV);

/// Process globals so that they can be used in ThinLTO. This includes
  /// promoting local variables so that they can be reference externally by
  /// thin lto imported globals and converting strong external globals to
  /// available_externally.
  void processGlobalsForThinLTO();
  void processGlobalForThinLTO(GlobalValue &GV);

/// Get the new linkage for SGV that should be used in the linked destination
  /// module. Specifically, for ThinLTO importing or exporting it may need
  /// to be adjusted. When \p DoPromote is true then we must adjust the
  /// linkage for a required promotion of a local to global scope.
  GlobalValue::LinkageTypes getLinkage(const GlobalValue *SGV, bool DoPromote);

public:
  FunctionImportGlobalProcessing(Module &M, const ModuleSummaryIndex &Index,
                                 SetVector<GlobalValue *> *GlobalsToImport,
                                 bool ClearDSOLocalOnDeclarations)
      : M(M), ImportIndex(Index), GlobalsToImport(GlobalsToImport),
        ClearDSOLocalOnDeclarations(ClearDSOLocalOnDeclarations) {
    // If we have a ModuleSummaryIndex but no function to import,
    // then this is the primary module being compiled in a ThinLTO
    // backend compilation, and we need to see if it has functions that
    // may be exported to another backend compilation.
    if (!GlobalsToImport)
      HasExportedFunctions = ImportIndex.hasExportedFunctions(M);

#ifndef NDEBUG
    // First collect those in the llvm.used set.
    collectUsedGlobalVariables(M, Used, /*CompilerUsed*/ false);
    // Next collect those in the llvm.compiler.used set.
    collectUsedGlobalVariables(M, Used, /*CompilerUsed*/ true);
#endif
  }

bool run();
};

/// Perform in-place global value handling on the given Module for
/// exported local functions renamed and promoted for ThinLTO.
bool renameModuleForThinLTO(
    Module &M, const ModuleSummaryIndex &Index,
    bool ClearDSOLocalOnDeclarations,
    SetVector<GlobalValue *> *GlobalsToImport = nullptr);

/// Compute synthetic function entry counts.
void computeSyntheticCounts(ModuleSummaryIndex &Index);

} // End llvm namespace

#endif

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Editing: FunctionImportUtils.h

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