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//===---- llvm/MDBuilder.h - Builder for LLVM metadata ----------*- 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 MDBuilder class, which is used as a convenient way to
// create LLVM metadata with a consistent and simplified interface.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_IR_MDBUILDER_H
#define LLVM_IR_MDBUILDER_H
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/DataTypes.h"
#include <utility>
namespace llvm {
class APInt;
template <typename T> class ArrayRef;
class LLVMContext;
class MDNode;
class MDString;
class MDBuilder {
LLVMContext &Context;
public:
MDBuilder(LLVMContext &context) : Context(context) {}
/// \brief Return the given string as metadata.
MDString *createString(StringRef Str);
//===------------------------------------------------------------------===//
// FPMath metadata.
//===------------------------------------------------------------------===//
/// \brief Return metadata with the given settings. The special value 0.0
/// for the Accuracy parameter indicates the default (maximal precision)
/// setting.
MDNode *createFPMath(float Accuracy);
//===------------------------------------------------------------------===//
// Prof metadata.
//===------------------------------------------------------------------===//
/// \brief Return metadata containing two branch weights.
MDNode *createBranchWeights(uint32_t TrueWeight, uint32_t FalseWeight);
/// \brief Return metadata containing a number of branch weights.
MDNode *createBranchWeights(ArrayRef<uint32_t> Weights);
//===------------------------------------------------------------------===//
// Range metadata.
//===------------------------------------------------------------------===//
/// \brief Return metadata describing the range [Lo, Hi).
MDNode *createRange(const APInt &Lo, const APInt &Hi);
//===------------------------------------------------------------------===//
// AA metadata.
//===------------------------------------------------------------------===//
protected:
/// \brief Return metadata appropriate for a AA root node (scope or TBAA).
/// Each returned node is distinct from all other metadata and will never
/// be identified (uniqued) with anything else.
MDNode *createAnonymousAARoot(StringRef Name = StringRef(),
MDNode *Extra = nullptr);
public:
/// \brief Return metadata appropriate for a TBAA root node. Each returned
/// node is distinct from all other metadata and will never be identified
/// (uniqued) with anything else.
MDNode *createAnonymousTBAARoot() {
return createAnonymousAARoot();
}
/// \brief Return metadata appropriate for an alias scope domain node.
/// Each returned node is distinct from all other metadata and will never
/// be identified (uniqued) with anything else.
MDNode *createAnonymousAliasScopeDomain(StringRef Name = StringRef()) {
return createAnonymousAARoot(Name);
}
/// \brief Return metadata appropriate for an alias scope root node.
/// Each returned node is distinct from all other metadata and will never
/// be identified (uniqued) with anything else.
MDNode *createAnonymousAliasScope(MDNode *Domain,
StringRef Name = StringRef()) {
return createAnonymousAARoot(Name, Domain);
}
/// \brief Return metadata appropriate for a TBAA root node with the given
/// name. This may be identified (uniqued) with other roots with the same
/// name.
MDNode *createTBAARoot(StringRef Name);
/// \brief Return metadata appropriate for an alias scope domain node with
/// the given name. This may be identified (uniqued) with other roots with
/// the same name.
MDNode *createAliasScopeDomain(StringRef Name);
/// \brief Return metadata appropriate for an alias scope node with
/// the given name. This may be identified (uniqued) with other scopes with
/// the same name and domain.
MDNode *createAliasScope(StringRef Name, MDNode *Domain);
/// \brief Return metadata for a non-root TBAA node with the given name,
/// parent in the TBAA tree, and value for 'pointsToConstantMemory'.
MDNode *createTBAANode(StringRef Name, MDNode *Parent,
bool isConstant = false);
struct TBAAStructField {
uint64_t Offset;
uint64_t Size;
MDNode *TBAA;
TBAAStructField(uint64_t Offset, uint64_t Size, MDNode *TBAA) :
Offset(Offset), Size(Size), TBAA(TBAA) {}
};
/// \brief Return metadata for a tbaa.struct node with the given
/// struct field descriptions.
MDNode *createTBAAStructNode(ArrayRef<TBAAStructField> Fields);
/// \brief Return metadata for a TBAA struct node in the type DAG
/// with the given name, a list of pairs (offset, field type in the type DAG).
MDNode *
createTBAAStructTypeNode(StringRef Name,
ArrayRef<std::pair<MDNode *, uint64_t>> Fields);
/// \brief Return metadata for a TBAA scalar type node with the
/// given name, an offset and a parent in the TBAA type DAG.
MDNode *createTBAAScalarTypeNode(StringRef Name, MDNode *Parent,
uint64_t Offset = 0);
/// \brief Return metadata for a TBAA tag node with the given
/// base type, access type and offset relative to the base type.
MDNode *createTBAAStructTagNode(MDNode *BaseType, MDNode *AccessType,
uint64_t Offset);
};
} // end namespace llvm
#endif
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