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//===- IRMover.h ------------------------------------------------*- 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
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LINKER_IRMOVER_H
#define LLVM_LINKER_IRMOVER_H
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseSet.h"
#include "llvm/ADT/FunctionExtras.h"
#include <functional>
namespace llvm {
class Error;
class GlobalValue;
class Metadata;
class Module;
class StructType;
class TrackingMDRef;
class Type;
class IRMover {
struct StructTypeKeyInfo {
struct KeyTy {
ArrayRef<Type *> ETypes;
bool IsPacked;
KeyTy(ArrayRef<Type *> E, bool P);
KeyTy(const StructType *ST);
bool operator==(const KeyTy &that) const;
bool operator!=(const KeyTy &that) const;
};
static StructType *getEmptyKey();
static StructType *getTombstoneKey();
static unsigned getHashValue(const KeyTy &Key);
static unsigned getHashValue(const StructType *ST);
static bool isEqual(const KeyTy &LHS, const StructType *RHS);
static bool isEqual(const StructType *LHS, const StructType *RHS);
};
/// Type of the Metadata map in \a ValueToValueMapTy.
typedef DenseMap<const Metadata *, TrackingMDRef> MDMapT;
public:
class IdentifiedStructTypeSet {
// The set of opaque types is the composite module.
DenseSet<StructType *> OpaqueStructTypes;
// The set of identified but non opaque structures in the composite module.
DenseSet<StructType *, StructTypeKeyInfo> NonOpaqueStructTypes;
public:
void addNonOpaque(StructType *Ty);
void switchToNonOpaque(StructType *Ty);
void addOpaque(StructType *Ty);
StructType *findNonOpaque(ArrayRef<Type *> ETypes, bool IsPacked);
bool hasType(StructType *Ty);
};
IRMover(Module &M);
typedef std::function<void(GlobalValue &)> ValueAdder;
using LazyCallback =
llvm::unique_function<void(GlobalValue &GV, ValueAdder Add)>;
/// Move in the provide values in \p ValuesToLink from \p Src.
///
/// - \p AddLazyFor is a call back that the IRMover will call when a global
/// value is referenced by one of the ValuesToLink (transitively) but was
/// not present in ValuesToLink. The GlobalValue and a ValueAdder callback
/// are passed as an argument, and the callback is expected to be called
/// if the GlobalValue needs to be added to the \p ValuesToLink and linked.
/// Pass nullptr if there's no work to be done in such cases.
/// - \p IsPerformingImport is true when this IR link is to perform ThinLTO
/// function importing from Src.
Error move(std::unique_ptr<Module> Src, ArrayRef<GlobalValue *> ValuesToLink,
LazyCallback AddLazyFor, bool IsPerformingImport);
Module &getModule() { return Composite; }
private:
Module &Composite;
IdentifiedStructTypeSet IdentifiedStructTypes;
MDMapT SharedMDs; ///< A Metadata map to use for all calls to \a move().
};
} // End llvm namespace
#endif
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