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//===---- llvm/MDBuilder.h - Builder for LLVM metadata ----------*- 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 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/DenseSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/Support/DataTypes.h"
#include <utility>
namespace llvm {
class APInt;
template <typename T> class ArrayRef;
class LLVMContext;
class Constant;
class ConstantAsMetadata;
class Function;
class MDNode;
class MDString;
class Metadata;
class MDBuilder {
LLVMContext &Context;
public:
MDBuilder(LLVMContext &context) : Context(context) {}
/// Return the given string as metadata.
MDString *createString(StringRef Str);
/// Return the given constant as metadata.
ConstantAsMetadata *createConstant(Constant *C);
//===------------------------------------------------------------------===//
// FPMath metadata.
//===------------------------------------------------------------------===//
/// 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.
//===------------------------------------------------------------------===//
/// Return metadata containing two branch weights.
/// @param TrueWeight the weight of the true branch
/// @param FalseWeight the weight of the false branch
/// @param Do these weights come from __builtin_expect*
MDNode *createBranchWeights(uint32_t TrueWeight, uint32_t FalseWeight,
bool IsExpected = false);
/// Return metadata containing two branch weights, with significant bias
/// towards `true` destination.
MDNode *createLikelyBranchWeights();
/// Return metadata containing two branch weights, with significant bias
/// towards `false` destination.
MDNode *createUnlikelyBranchWeights();
/// Return metadata containing a number of branch weights.
/// @param Weights the weights of all the branches
/// @param Do these weights come from __builtin_expect*
MDNode *createBranchWeights(ArrayRef<uint32_t> Weights,
bool IsExpected = false);
/// Return metadata specifying that a branch or switch is unpredictable.
MDNode *createUnpredictable();
/// Return metadata containing the entry \p Count for a function, a boolean
/// \Synthetic indicating whether the counts were synthetized, and the
/// GUIDs stored in \p Imports that need to be imported for sample PGO, to
/// enable the same inlines as the profiled optimized binary
MDNode *createFunctionEntryCount(uint64_t Count, bool Synthetic,
const DenseSet<GlobalValue::GUID> *Imports);
/// Return metadata containing the section prefix for a function.
MDNode *createFunctionSectionPrefix(StringRef Prefix);
/// Return metadata containing the pseudo probe descriptor for a function.
MDNode *createPseudoProbeDesc(uint64_t GUID, uint64_t Hash, StringRef FName);
/// Return metadata containing llvm statistics.
MDNode *
createLLVMStats(ArrayRef<std::pair<StringRef, uint64_t>> LLVMStatsVec);
//===------------------------------------------------------------------===//
// Range metadata.
//===------------------------------------------------------------------===//
/// Return metadata describing the range [Lo, Hi).
MDNode *createRange(const APInt &Lo, const APInt &Hi);
/// Return metadata describing the range [Lo, Hi).
MDNode *createRange(Constant *Lo, Constant *Hi);
//===------------------------------------------------------------------===//
// Callees metadata.
//===------------------------------------------------------------------===//
/// Return metadata indicating the possible callees of indirect
/// calls.
MDNode *createCallees(ArrayRef<Function *> Callees);
//===------------------------------------------------------------------===//
// Callback metadata.
//===------------------------------------------------------------------===//
/// Return metadata describing a callback (see llvm::AbstractCallSite).
MDNode *createCallbackEncoding(unsigned CalleeArgNo, ArrayRef<int> Arguments,
bool VarArgsArePassed);
/// Merge the new callback encoding \p NewCB into \p ExistingCallbacks.
MDNode *mergeCallbackEncodings(MDNode *ExistingCallbacks, MDNode *NewCB);
/// Return metadata feeding to the CodeGen about how to generate a function
/// prologue for the "function" santizier.
MDNode *createRTTIPointerPrologue(Constant *PrologueSig, Constant *RTTI);
//===------------------------------------------------------------------===//
// PC sections metadata.
//===------------------------------------------------------------------===//
/// A pair of PC section name with auxilliary constant data.
using PCSection = std::pair<StringRef, SmallVector<Constant *>>;
/// Return metadata for PC sections.
MDNode *createPCSections(ArrayRef<PCSection> Sections);
//===------------------------------------------------------------------===//
// AA metadata.
//===------------------------------------------------------------------===//
protected:
/// 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:
/// 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();
}
/// 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);
}
/// 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);
}
/// 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);
/// 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);
/// 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);
/// 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 *Type;
TBAAStructField(uint64_t Offset, uint64_t Size, MDNode *Type) :
Offset(Offset), Size(Size), Type(Type) {}
};
/// Return metadata for a tbaa.struct node with the given
/// struct field descriptions.
MDNode *createTBAAStructNode(ArrayRef<TBAAStructField> Fields);
/// 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);
/// 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);
/// 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, bool IsConstant = false);
/// Return metadata for a TBAA type node in the TBAA type DAG with the
/// given parent type, size in bytes, type identifier and a list of fields.
MDNode *createTBAATypeNode(MDNode *Parent, uint64_t Size, Metadata *Id,
ArrayRef<TBAAStructField> Fields =
ArrayRef<TBAAStructField>());
/// Return metadata for a TBAA access tag with the given base type,
/// final access type, offset of the access relative to the base type, size of
/// the access and flag indicating whether the accessed object can be
/// considered immutable for the purposes of the TBAA analysis.
MDNode *createTBAAAccessTag(MDNode *BaseType, MDNode *AccessType,
uint64_t Offset, uint64_t Size,
bool IsImmutable = false);
/// Return mutable version of the given mutable or immutable TBAA
/// access tag.
MDNode *createMutableTBAAAccessTag(MDNode *Tag);
/// Return metadata containing an irreducible loop header weight.
MDNode *createIrrLoopHeaderWeight(uint64_t Weight);
};
} // end namespace llvm
#endif
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