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//===-- Bitcode/Reader/MetadataLoader.h - Load Metadatas -------*- 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 class handles loading Metadatas.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_BITCODE_READER_METADATALOADER_H
#define LLVM_LIB_BITCODE_READER_METADATALOADER_H
#include "llvm/ADT/SmallVector.h"
#include "llvm/Support/Error.h"
#include <functional>
#include <memory>
namespace llvm {
class BitcodeReaderValueList;
class BitstreamCursor;
class DISubprogram;
class Function;
class Instruction;
class Metadata;
class Module;
class Type;
/// Helper class that handles loading Metadatas and keeping them available.
class MetadataLoader {
class MetadataLoaderImpl;
std::unique_ptr<MetadataLoaderImpl> Pimpl;
Error parseMetadata(bool ModuleLevel);
public:
~MetadataLoader();
MetadataLoader(BitstreamCursor &Stream, Module &TheModule,
BitcodeReaderValueList &ValueList, bool IsImporting,
std::function<Type *(unsigned)> getTypeByID);
MetadataLoader &operator=(MetadataLoader &&);
MetadataLoader(MetadataLoader &&);
// Parse a module metadata block
Error parseModuleMetadata() { return parseMetadata(true); }
// Parse a function metadata block
Error parseFunctionMetadata() { return parseMetadata(false); }
/// Set the mode to strip TBAA metadata on load.
void setStripTBAA(bool StripTBAA = true);
/// Return true if the Loader is stripping TBAA metadata.
bool isStrippingTBAA();
// Return true there are remaining unresolved forward references.
bool hasFwdRefs() const;
/// Return the given metadata, creating a replaceable forward reference if
/// necessary.
Metadata *getMetadataFwdRefOrLoad(unsigned Idx);
/// Return the DISubprogram metadata for a Function if any, null otherwise.
DISubprogram *lookupSubprogramForFunction(Function *F);
/// Parse a `METADATA_ATTACHMENT` block for a function.
Error parseMetadataAttachment(
Function &F, const SmallVectorImpl<Instruction *> &InstructionList);
/// Parse a `METADATA_KIND` block for the current module.
Error parseMetadataKinds();
unsigned size() const;
void shrinkTo(unsigned N);
/// Perform bitcode upgrades on llvm.dbg.* calls.
void upgradeDebugIntrinsics(Function &F);
};
}
#endif // LLVM_LIB_BITCODE_READER_METADATALOADER_H
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