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-rw-r--r--gnu/llvm/include/llvm/Transforms/Utils/FunctionImportUtils.h127
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diff --git a/gnu/llvm/include/llvm/Transforms/Utils/FunctionImportUtils.h b/gnu/llvm/include/llvm/Transforms/Utils/FunctionImportUtils.h
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--- a/gnu/llvm/include/llvm/Transforms/Utils/FunctionImportUtils.h
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-//===- FunctionImportUtils.h - Importing support utilities -----*- C++ -*-===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// 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 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);
-
-#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 SGV that should be used in the linked destination
- /// module. Specifically, this handles the case where we need to rename
- /// a local that is being promoted to global scope, which it will always
- /// do when \p DoPromote is true (or when importing a local).
- std::string getName(const GlobalValue *SGV, bool DoPromote);
-
- /// 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 = nullptr)
- : M(M), ImportIndex(Index), GlobalsToImport(GlobalsToImport) {
- // 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();
-
- static bool doImportAsDefinition(const GlobalValue *SGV,
- SetVector<GlobalValue *> *GlobalsToImport);
-};
-
-/// 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,
- SetVector<GlobalValue *> *GlobalsToImport = nullptr);
-
-/// Compute synthetic function entry counts.
-void computeSyntheticCounts(ModuleSummaryIndex &Index);
-
-} // End llvm namespace
-
-#endif