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103 lines
4.2 KiB
C++
103 lines
4.2 KiB
C++
//===- FunctionImportUtils.h - Importing support utilities -----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the FunctionImportGlobalProcessing class which is used
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// to perform the necessary global value handling for function importing.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_UTILS_FUNCTIONIMPORTUTILS_H
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#define LLVM_TRANSFORMS_UTILS_FUNCTIONIMPORTUTILS_H
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#include "llvm/ADT/SetVector.h"
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#include "llvm/IR/ModuleSummaryIndex.h"
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namespace llvm {
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class Module;
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/// Class to handle necessary GlobalValue changes required by ThinLTO
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/// function importing, including linkage changes and any necessary renaming.
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class FunctionImportGlobalProcessing {
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/// The Module which we are exporting or importing functions from.
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Module &M;
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/// Module summary index passed in for function importing/exporting handling.
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const ModuleSummaryIndex &ImportIndex;
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/// Globals to import from this module, all other functions will be
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/// imported as declarations instead of definitions.
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DenseSet<const GlobalValue *> *GlobalsToImport;
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/// Set to true if the given ModuleSummaryIndex contains any functions
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/// from this source module, in which case we must conservatively assume
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/// that any of its functions may be imported into another module
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/// as part of a different backend compilation process.
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bool HasExportedFunctions = false;
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/// Check if we should promote the given local value to global scope.
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bool shouldPromoteLocalToGlobal(const GlobalValue *SGV);
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/// Helper methods to check if we are importing from or potentially
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/// exporting from the current source module.
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bool isPerformingImport() const { return GlobalsToImport != nullptr; }
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bool isModuleExporting() const { return HasExportedFunctions; }
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/// If we are importing from the source module, checks if we should
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/// import SGV as a definition, otherwise import as a declaration.
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bool doImportAsDefinition(const GlobalValue *SGV);
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/// Get the name for SGV that should be used in the linked destination
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/// module. Specifically, this handles the case where we need to rename
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/// a local that is being promoted to global scope, which it will always
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/// do when \p DoPromote is true (or when importing a local).
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std::string getName(const GlobalValue *SGV, bool DoPromote);
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/// Process globals so that they can be used in ThinLTO. This includes
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/// promoting local variables so that they can be reference externally by
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/// thin lto imported globals and converting strong external globals to
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/// available_externally.
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void processGlobalsForThinLTO();
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void processGlobalForThinLTO(GlobalValue &GV);
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/// Get the new linkage for SGV that should be used in the linked destination
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/// module. Specifically, for ThinLTO importing or exporting it may need
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/// to be adjusted. When \p DoPromote is true then we must adjust the
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/// linkage for a required promotion of a local to global scope.
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GlobalValue::LinkageTypes getLinkage(const GlobalValue *SGV, bool DoPromote);
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public:
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FunctionImportGlobalProcessing(
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Module &M, const ModuleSummaryIndex &Index,
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DenseSet<const GlobalValue *> *GlobalsToImport = nullptr)
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: M(M), ImportIndex(Index), GlobalsToImport(GlobalsToImport) {
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// If we have a ModuleSummaryIndex but no function to import,
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// then this is the primary module being compiled in a ThinLTO
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// backend compilation, and we need to see if it has functions that
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// may be exported to another backend compilation.
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if (!GlobalsToImport)
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HasExportedFunctions = ImportIndex.hasExportedFunctions(M);
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}
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bool run();
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static bool
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doImportAsDefinition(const GlobalValue *SGV,
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DenseSet<const GlobalValue *> *GlobalsToImport);
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};
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/// Perform in-place global value handling on the given Module for
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/// exported local functions renamed and promoted for ThinLTO.
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bool renameModuleForThinLTO(
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Module &M, const ModuleSummaryIndex &Index,
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DenseSet<const GlobalValue *> *GlobalsToImport = nullptr);
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} // End llvm namespace
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#endif
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