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//===- llvm/ModuleSummaryIndex.h - Module Summary Index ---------*- C++ -*-===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
/// @file
/// ModuleSummaryIndex.h This file contains the declarations the classes that
/// hold the module index and summary for function importing.
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/IR/Module.h"
#include <algorithm>
#include <array>
#include <cassert>
#include <cstddef>
#include <cstdint>
#include <map>
#include <memory>
#include <set>
#include <string>
#include <utility>
#include <vector>
namespace llvm {
namespace yaml {
template <typename T> struct MappingTraits;
} // end namespace yaml
/// \brief Class to accumulate and hold information about a callee.
struct CalleeInfo {
enum class HotnessType : uint8_t {
Unknown = 0,
Cold = 1,
None = 2,
Hot = 3,
Critical = 4
HotnessType Hotness = HotnessType::Unknown;
CalleeInfo() = default;
explicit CalleeInfo(HotnessType Hotness) : Hotness(Hotness) {}
void updateHotness(const HotnessType OtherHotness) {
Hotness = std::max(Hotness, OtherHotness);
class GlobalValueSummary;
using GlobalValueSummaryList = std::vector<std::unique_ptr<GlobalValueSummary>>;
struct GlobalValueSummaryInfo {
/// The GlobalValue corresponding to this summary. This is only used in
/// per-module summaries.
const GlobalValue *GV = nullptr;
/// List of global value summary structures for a particular value held
/// in the GlobalValueMap. Requires a vector in the case of multiple
/// COMDAT values of the same name.
GlobalValueSummaryList SummaryList;
/// Map from global value GUID to corresponding summary structures. Use a
/// std::map rather than a DenseMap so that pointers to the map's value_type
/// (which are used by ValueInfo) are not invalidated by insertion. Also it will
/// likely incur less overhead, as the value type is not very small and the size
/// of the map is unknown, resulting in inefficiencies due to repeated
/// insertions and resizing.
using GlobalValueSummaryMapTy =
std::map<GlobalValue::GUID, GlobalValueSummaryInfo>;
/// Struct that holds a reference to a particular GUID in a global value
/// summary.
struct ValueInfo {
const GlobalValueSummaryMapTy::value_type *Ref = nullptr;
ValueInfo() = default;
ValueInfo(const GlobalValueSummaryMapTy::value_type *Ref) : Ref(Ref) {}
operator bool() const { return Ref; }
GlobalValue::GUID getGUID() const { return Ref->first; }
const GlobalValue *getValue() const { return Ref->second.GV; }
ArrayRef<std::unique_ptr<GlobalValueSummary>> getSummaryList() const {
return Ref->second.SummaryList;
template <> struct DenseMapInfo<ValueInfo> {
static inline ValueInfo getEmptyKey() {
return ValueInfo((GlobalValueSummaryMapTy::value_type *)-1);
static inline ValueInfo getTombstoneKey() {
return ValueInfo((GlobalValueSummaryMapTy::value_type *)-2);
static bool isEqual(ValueInfo L, ValueInfo R) { return L.Ref == R.Ref; }
static unsigned getHashValue(ValueInfo I) { return (uintptr_t)I.Ref; }
/// \brief Function and variable summary information to aid decisions and
/// implementation of importing.
class GlobalValueSummary {
/// \brief Sububclass discriminator (for dyn_cast<> et al.)
enum SummaryKind : unsigned { AliasKind, FunctionKind, GlobalVarKind };
/// Group flags (Linkage, NotEligibleToImport, etc.) as a bitfield.
struct GVFlags {
/// \brief The linkage type of the associated global value.
/// One use is to flag values that have local linkage types and need to
/// have module identifier appended before placing into the combined
/// index, to disambiguate from other values with the same name.
/// In the future this will be used to update and optimize linkage
/// types based on global summary-based analysis.
unsigned Linkage : 4;
/// Indicate if the global value cannot be imported (e.g. it cannot
/// be renamed or references something that can't be renamed).
unsigned NotEligibleToImport : 1;
/// In per-module summary, indicate that the global value must be considered
/// a live root for index-based liveness analysis. Used for special LLVM
/// values such as llvm.global_ctors that the linker does not know about.
/// In combined summary, indicate that the global value is live.
unsigned Live : 1;
/// Indicates that the linker resolved the symbol to a definition from
/// within the same linkage unit.
unsigned DSOLocal : 1;
/// Convenience Constructors
explicit GVFlags(GlobalValue::LinkageTypes Linkage,
bool NotEligibleToImport, bool Live, bool IsLocal)
: Linkage(Linkage), NotEligibleToImport(NotEligibleToImport),
Live(Live), DSOLocal(IsLocal) {}
/// Kind of summary for use in dyn_cast<> et al.
SummaryKind Kind;
GVFlags Flags;
/// This is the hash of the name of the symbol in the original file. It is
/// identical to the GUID for global symbols, but differs for local since the
/// GUID includes the module level id in the hash.
GlobalValue::GUID OriginalName = 0;
/// \brief Path of module IR containing value's definition, used to locate
/// module during importing.
/// This is only used during parsing of the combined index, or when
/// parsing the per-module index for creation of the combined summary index,
/// not during writing of the per-module index which doesn't contain a
/// module path string table.
StringRef ModulePath;
/// List of values referenced by this global value's definition
/// (either by the initializer of a global variable, or referenced
/// from within a function). This does not include functions called, which
/// are listed in the derived FunctionSummary object.
std::vector<ValueInfo> RefEdgeList;
bool isLive() const { return Flags.Live; }
GlobalValueSummary(SummaryKind K, GVFlags Flags, std::vector<ValueInfo> Refs)
: Kind(K), Flags(Flags), RefEdgeList(std::move(Refs)) {
assert((K != AliasKind || Refs.empty()) &&
"Expect no references for AliasSummary");
virtual ~GlobalValueSummary() = default;
/// Returns the hash of the original name, it is identical to the GUID for
/// externally visible symbols, but not for local ones.
GlobalValue::GUID getOriginalName() { return OriginalName; }
/// Initialize the original name hash in this summary.
void setOriginalName(GlobalValue::GUID Name) { OriginalName = Name; }
/// Which kind of summary subclass this is.
SummaryKind getSummaryKind() const { return Kind; }
/// Set the path to the module containing this function, for use in
/// the combined index.
void setModulePath(StringRef ModPath) { ModulePath = ModPath; }
/// Get the path to the module containing this function.
StringRef modulePath() const { return ModulePath; }
/// Get the flags for this GlobalValue (see \p struct GVFlags).
GVFlags flags() { return Flags; }
/// Return linkage type recorded for this global value.
GlobalValue::LinkageTypes linkage() const {
return static_cast<GlobalValue::LinkageTypes>(Flags.Linkage);
/// Sets the linkage to the value determined by global summary-based
/// optimization. Will be applied in the ThinLTO backends.
void setLinkage(GlobalValue::LinkageTypes Linkage) {
Flags.Linkage = Linkage;
/// Return true if this global value can't be imported.
bool notEligibleToImport() const { return Flags.NotEligibleToImport; }
void setLive(bool Live) { Flags.Live = Live; }
void setDSOLocal(bool Local) { Flags.DSOLocal = Local; }
bool isDSOLocal() const { return Flags.DSOLocal; }
/// Flag that this global value cannot be imported.
void setNotEligibleToImport() { Flags.NotEligibleToImport = true; }
/// Return the list of values referenced by this global value definition.
ArrayRef<ValueInfo> refs() const { return RefEdgeList; }
/// If this is an alias summary, returns the summary of the aliased object (a
/// global variable or function), otherwise returns itself.
GlobalValueSummary *getBaseObject();
friend class ModuleSummaryIndex;
friend void computeDeadSymbols(class ModuleSummaryIndex &,
const DenseSet<GlobalValue::GUID> &);
/// \brief Alias summary information.
class AliasSummary : public GlobalValueSummary {
GlobalValueSummary *AliaseeSummary;
AliasSummary(GVFlags Flags)
: GlobalValueSummary(AliasKind, Flags, ArrayRef<ValueInfo>{}) {}
/// Check if this is an alias summary.
static bool classof(const GlobalValueSummary *GVS) {
return GVS->getSummaryKind() == AliasKind;
void setAliasee(GlobalValueSummary *Aliasee) { AliaseeSummary = Aliasee; }
const GlobalValueSummary &getAliasee() const {
assert(AliaseeSummary && "Unexpected missing aliasee summary");
return *AliaseeSummary;
GlobalValueSummary &getAliasee() {
return const_cast<GlobalValueSummary &>(
static_cast<const AliasSummary *>(this)->getAliasee());
inline GlobalValueSummary *GlobalValueSummary::getBaseObject() {
if (auto *AS = dyn_cast<AliasSummary>(this))
return &AS->getAliasee();
return this;
/// \brief Function summary information to aid decisions and implementation of
/// importing.
class FunctionSummary : public GlobalValueSummary {
/// <CalleeValueInfo, CalleeInfo> call edge pair.
using EdgeTy = std::pair<ValueInfo, CalleeInfo>;
/// An "identifier" for a virtual function. This contains the type identifier
/// represented as a GUID and the offset from the address point to the virtual
/// function pointer, where "address point" is as defined in the Itanium ABI:
struct VFuncId {
GlobalValue::GUID GUID;
uint64_t Offset;
/// A specification for a virtual function call with all constant integer
/// arguments. This is used to perform virtual constant propagation on the
/// summary.
struct ConstVCall {
VFuncId VFunc;
std::vector<uint64_t> Args;
/// Function attribute flags. Used to track if a function accesses memory,
/// recurses or aliases.
struct FFlags {
unsigned ReadNone : 1;
unsigned ReadOnly : 1;
unsigned NoRecurse : 1;
unsigned ReturnDoesNotAlias : 1;
/// Number of instructions (ignoring debug instructions, e.g.) computed
/// during the initial compile step when the summary index is first built.
unsigned InstCount;
/// Function attribute flags. Used to track if a function accesses memory,
/// recurses or aliases.
FFlags FunFlags;
/// List of <CalleeValueInfo, CalleeInfo> call edge pairs from this function.
std::vector<EdgeTy> CallGraphEdgeList;
/// All type identifier related information. Because these fields are
/// relatively uncommon we only allocate space for them if necessary.
struct TypeIdInfo {
/// List of type identifiers used by this function in llvm.type.test
/// intrinsics other than by an llvm.assume intrinsic, represented as GUIDs.
std::vector<GlobalValue::GUID> TypeTests;
/// List of virtual calls made by this function using (respectively)
/// llvm.assume(llvm.type.test) or llvm.type.checked.load intrinsics that do
/// not have all constant integer arguments.
std::vector<VFuncId> TypeTestAssumeVCalls, TypeCheckedLoadVCalls;
/// List of virtual calls made by this function using (respectively)
/// llvm.assume(llvm.type.test) or llvm.type.checked.load intrinsics with
/// all constant integer arguments.
std::vector<ConstVCall> TypeTestAssumeConstVCalls,
std::unique_ptr<TypeIdInfo> TIdInfo;
FunctionSummary(GVFlags Flags, unsigned NumInsts, FFlags FunFlags,
std::vector<ValueInfo> Refs, std::vector<EdgeTy> CGEdges,
std::vector<GlobalValue::GUID> TypeTests,
std::vector<VFuncId> TypeTestAssumeVCalls,
std::vector<VFuncId> TypeCheckedLoadVCalls,
std::vector<ConstVCall> TypeTestAssumeConstVCalls,
std::vector<ConstVCall> TypeCheckedLoadConstVCalls)
: GlobalValueSummary(FunctionKind, Flags, std::move(Refs)),
InstCount(NumInsts), FunFlags(FunFlags),
CallGraphEdgeList(std::move(CGEdges)) {
if (!TypeTests.empty() || !TypeTestAssumeVCalls.empty() ||
!TypeCheckedLoadVCalls.empty() || !TypeTestAssumeConstVCalls.empty() ||
TIdInfo = llvm::make_unique<TypeIdInfo>(TypeIdInfo{
std::move(TypeTests), std::move(TypeTestAssumeVCalls),
/// Check if this is a function summary.
static bool classof(const GlobalValueSummary *GVS) {
return GVS->getSummaryKind() == FunctionKind;
/// Get function attribute flags.
FFlags &fflags() { return FunFlags; }
/// Get the instruction count recorded for this function.
unsigned instCount() const { return InstCount; }
/// Return the list of <CalleeValueInfo, CalleeInfo> pairs.
ArrayRef<EdgeTy> calls() const { return CallGraphEdgeList; }
/// Returns the list of type identifiers used by this function in
/// llvm.type.test intrinsics other than by an llvm.assume intrinsic,
/// represented as GUIDs.
ArrayRef<GlobalValue::GUID> type_tests() const {
if (TIdInfo)
return TIdInfo->TypeTests;
return {};
/// Returns the list of virtual calls made by this function using
/// llvm.assume(llvm.type.test) intrinsics that do not have all constant
/// integer arguments.
ArrayRef<VFuncId> type_test_assume_vcalls() const {
if (TIdInfo)
return TIdInfo->TypeTestAssumeVCalls;
return {};
/// Returns the list of virtual calls made by this function using
/// llvm.type.checked.load intrinsics that do not have all constant integer
/// arguments.
ArrayRef<VFuncId> type_checked_load_vcalls() const {
if (TIdInfo)
return TIdInfo->TypeCheckedLoadVCalls;
return {};
/// Returns the list of virtual calls made by this function using
/// llvm.assume(llvm.type.test) intrinsics with all constant integer
/// arguments.
ArrayRef<ConstVCall> type_test_assume_const_vcalls() const {
if (TIdInfo)
return TIdInfo->TypeTestAssumeConstVCalls;
return {};
/// Returns the list of virtual calls made by this function using
/// llvm.type.checked.load intrinsics with all constant integer arguments.
ArrayRef<ConstVCall> type_checked_load_const_vcalls() const {
if (TIdInfo)
return TIdInfo->TypeCheckedLoadConstVCalls;
return {};
/// Add a type test to the summary. This is used by WholeProgramDevirt if we
/// were unable to devirtualize a checked call.
void addTypeTest(GlobalValue::GUID Guid) {
if (!TIdInfo)
TIdInfo = llvm::make_unique<TypeIdInfo>();
template <> struct DenseMapInfo<FunctionSummary::VFuncId> {
static FunctionSummary::VFuncId getEmptyKey() { return {0, uint64_t(-1)}; }
static FunctionSummary::VFuncId getTombstoneKey() {
return {0, uint64_t(-2)};
static bool isEqual(FunctionSummary::VFuncId L, FunctionSummary::VFuncId R) {
return L.GUID == R.GUID && L.Offset == R.Offset;
static unsigned getHashValue(FunctionSummary::VFuncId I) { return I.GUID; }
template <> struct DenseMapInfo<FunctionSummary::ConstVCall> {
static FunctionSummary::ConstVCall getEmptyKey() {
return {{0, uint64_t(-1)}, {}};
static FunctionSummary::ConstVCall getTombstoneKey() {
return {{0, uint64_t(-2)}, {}};
static bool isEqual(FunctionSummary::ConstVCall L,
FunctionSummary::ConstVCall R) {
return DenseMapInfo<FunctionSummary::VFuncId>::isEqual(L.VFunc, R.VFunc) &&
L.Args == R.Args;
static unsigned getHashValue(FunctionSummary::ConstVCall I) {
return I.VFunc.GUID;
/// \brief Global variable summary information to aid decisions and
/// implementation of importing.
/// Currently this doesn't add anything to the base \p GlobalValueSummary,
/// but is a placeholder as additional info may be added to the summary
/// for variables.
class GlobalVarSummary : public GlobalValueSummary {
GlobalVarSummary(GVFlags Flags, std::vector<ValueInfo> Refs)
: GlobalValueSummary(GlobalVarKind, Flags, std::move(Refs)) {}
/// Check if this is a global variable summary.
static bool classof(const GlobalValueSummary *GVS) {
return GVS->getSummaryKind() == GlobalVarKind;
struct TypeTestResolution {
/// Specifies which kind of type check we should emit for this byte array.
/// See for full
/// details on each kind of check; the enumerators are described with
/// reference to that document.
enum Kind {
Unsat, ///< Unsatisfiable type (i.e. no global has this type metadata)
ByteArray, ///< Test a byte array (first example)
Inline, ///< Inlined bit vector ("Short Inline Bit Vectors")
Single, ///< Single element (last example in "Short Inline Bit Vectors")
AllOnes, ///< All-ones bit vector ("Eliminating Bit Vector Checks for
/// All-Ones Bit Vectors")
} TheKind = Unsat;
/// Range of size-1 expressed as a bit width. For example, if the size is in
/// range [1,256], this number will be 8. This helps generate the most compact
/// instruction sequences.
unsigned SizeM1BitWidth = 0;
// The following fields are only used if the target does not support the use
// of absolute symbols to store constants. Their meanings are the same as the
// corresponding fields in LowerTypeTestsModule::TypeIdLowering in
// LowerTypeTests.cpp.
uint64_t AlignLog2 = 0;
uint64_t SizeM1 = 0;
uint8_t BitMask = 0;
uint64_t InlineBits = 0;
struct WholeProgramDevirtResolution {
enum Kind {
Indir, ///< Just do a regular virtual call
SingleImpl, ///< Single implementation devirtualization
} TheKind = Indir;
std::string SingleImplName;
struct ByArg {
enum Kind {
Indir, ///< Just do a regular virtual call
UniformRetVal, ///< Uniform return value optimization
UniqueRetVal, ///< Unique return value optimization
VirtualConstProp, ///< Virtual constant propagation
} TheKind = Indir;
/// Additional information for the resolution:
/// - UniformRetVal: the uniform return value.
/// - UniqueRetVal: the return value associated with the unique vtable (0 or
/// 1).
uint64_t Info = 0;
// The following fields are only used if the target does not support the use
// of absolute symbols to store constants.
uint32_t Byte = 0;
uint32_t Bit = 0;
/// Resolutions for calls with all constant integer arguments (excluding the
/// first argument, "this"), where the key is the argument vector.
std::map<std::vector<uint64_t>, ByArg> ResByArg;
struct TypeIdSummary {
TypeTestResolution TTRes;
/// Mapping from byte offset to whole-program devirt resolution for that
/// (typeid, byte offset) pair.
std::map<uint64_t, WholeProgramDevirtResolution> WPDRes;
/// 160 bits SHA1
using ModuleHash = std::array<uint32_t, 5>;
/// Type used for iterating through the global value summary map.
using const_gvsummary_iterator = GlobalValueSummaryMapTy::const_iterator;
using gvsummary_iterator = GlobalValueSummaryMapTy::iterator;
/// String table to hold/own module path strings, which additionally holds the
/// module ID assigned to each module during the plugin step, as well as a hash
/// of the module. The StringMap makes a copy of and owns inserted strings.
using ModulePathStringTableTy = StringMap<std::pair<uint64_t, ModuleHash>>;
/// Map of global value GUID to its summary, used to identify values defined in
/// a particular module, and provide efficient access to their summary.
using GVSummaryMapTy = DenseMap<GlobalValue::GUID, GlobalValueSummary *>;
/// Class to hold module path string table and global value map,
/// and encapsulate methods for operating on them.
class ModuleSummaryIndex {
/// Map from value name to list of summary instances for values of that
/// name (may be duplicates in the COMDAT case, e.g.).
GlobalValueSummaryMapTy GlobalValueMap;
/// Holds strings for combined index, mapping to the corresponding module ID.
ModulePathStringTableTy ModulePathStringTable;
/// Mapping from type identifiers to summary information for that type
/// identifier.
// FIXME: Add bitcode read/write support for this field.
std::map<std::string, TypeIdSummary> TypeIdMap;
/// Mapping from original ID to GUID. If original ID can map to multiple
/// GUIDs, it will be mapped to 0.
std::map<GlobalValue::GUID, GlobalValue::GUID> OidGuidMap;
/// Indicates that summary-based GlobalValue GC has run, and values with
/// GVFlags::Live==false are really dead. Otherwise, all values must be
/// considered live.
bool WithGlobalValueDeadStripping = false;
std::set<std::string> CfiFunctionDefs;
std::set<std::string> CfiFunctionDecls;
// YAML I/O support.
friend yaml::MappingTraits<ModuleSummaryIndex>;
GlobalValueSummaryMapTy::value_type *
getOrInsertValuePtr(GlobalValue::GUID GUID) {
return &*GlobalValueMap.emplace(GUID, GlobalValueSummaryInfo{}).first;
gvsummary_iterator begin() { return GlobalValueMap.begin(); }
const_gvsummary_iterator begin() const { return GlobalValueMap.begin(); }
gvsummary_iterator end() { return GlobalValueMap.end(); }
const_gvsummary_iterator end() const { return GlobalValueMap.end(); }
size_t size() const { return GlobalValueMap.size(); }
bool withGlobalValueDeadStripping() const {
return WithGlobalValueDeadStripping;
void setWithGlobalValueDeadStripping() {
WithGlobalValueDeadStripping = true;
bool isGlobalValueLive(const GlobalValueSummary *GVS) const {
return !WithGlobalValueDeadStripping || GVS->isLive();
bool isGUIDLive(GlobalValue::GUID GUID) const;
/// Return a ValueInfo for GUID if it exists, otherwise return ValueInfo().
ValueInfo getValueInfo(GlobalValue::GUID GUID) const {
auto I = GlobalValueMap.find(GUID);
return ValueInfo(I == GlobalValueMap.end() ? nullptr : &*I);
/// Return a ValueInfo for \p GUID.
ValueInfo getOrInsertValueInfo(GlobalValue::GUID GUID) {
return ValueInfo(getOrInsertValuePtr(GUID));
/// Return a ValueInfo for \p GV and mark it as belonging to GV.
ValueInfo getOrInsertValueInfo(const GlobalValue *GV) {
auto VP = getOrInsertValuePtr(GV->getGUID());
VP->second.GV = GV;
return ValueInfo(VP);
/// Return the GUID for \p OriginalId in the OidGuidMap.
GlobalValue::GUID getGUIDFromOriginalID(GlobalValue::GUID OriginalID) const {
const auto I = OidGuidMap.find(OriginalID);
return I == OidGuidMap.end() ? 0 : I->second;
std::set<std::string> &cfiFunctionDefs() { return CfiFunctionDefs; }
const std::set<std::string> &cfiFunctionDefs() const { return CfiFunctionDefs; }
std::set<std::string> &cfiFunctionDecls() { return CfiFunctionDecls; }
const std::set<std::string> &cfiFunctionDecls() const { return CfiFunctionDecls; }
/// Add a global value summary for a value of the given name.
void addGlobalValueSummary(StringRef ValueName,
std::unique_ptr<GlobalValueSummary> Summary) {
/// Add a global value summary for the given ValueInfo.
void addGlobalValueSummary(ValueInfo VI,
std::unique_ptr<GlobalValueSummary> Summary) {
addOriginalName(VI.getGUID(), Summary->getOriginalName());
// Here we have a notionally const VI, but the value it points to is owned
// by the non-const *this.
const_cast<GlobalValueSummaryMapTy::value_type *>(VI.Ref)
/// Add an original name for the value of the given GUID.
void addOriginalName(GlobalValue::GUID ValueGUID,
GlobalValue::GUID OrigGUID) {
if (OrigGUID == 0 || ValueGUID == OrigGUID)
if (OidGuidMap.count(OrigGUID) && OidGuidMap[OrigGUID] != ValueGUID)
OidGuidMap[OrigGUID] = 0;
OidGuidMap[OrigGUID] = ValueGUID;
/// Find the summary for global \p GUID in module \p ModuleId, or nullptr if
/// not found.
GlobalValueSummary *findSummaryInModule(GlobalValue::GUID ValueGUID,
StringRef ModuleId) const {
auto CalleeInfo = getValueInfo(ValueGUID);
if (!CalleeInfo) {
return nullptr; // This function does not have a summary
auto Summary =
[&](const std::unique_ptr<GlobalValueSummary> &Summary) {
return Summary->modulePath() == ModuleId;
if (Summary == CalleeInfo.getSummaryList().end())
return nullptr;
return Summary->get();
/// Returns the first GlobalValueSummary for \p GV, asserting that there
/// is only one if \p PerModuleIndex.
GlobalValueSummary *getGlobalValueSummary(const GlobalValue &GV,
bool PerModuleIndex = true) const {
assert(GV.hasName() && "Can't get GlobalValueSummary for GV with no name");
return getGlobalValueSummary(GlobalValue::getGUID(GV.getName()),
/// Returns the first GlobalValueSummary for \p ValueGUID, asserting that
/// there
/// is only one if \p PerModuleIndex.
GlobalValueSummary *getGlobalValueSummary(GlobalValue::GUID ValueGUID,
bool PerModuleIndex = true) const;
/// Table of modules, containing module hash and id.
const StringMap<std::pair<uint64_t, ModuleHash>> &modulePaths() const {
return ModulePathStringTable;
/// Table of modules, containing hash and id.
StringMap<std::pair<uint64_t, ModuleHash>> &modulePaths() {
return ModulePathStringTable;
/// Get the module ID recorded for the given module path.
uint64_t getModuleId(const StringRef ModPath) const {
return ModulePathStringTable.lookup(ModPath).first;
/// Get the module SHA1 hash recorded for the given module path.
const ModuleHash &getModuleHash(const StringRef ModPath) const {
auto It = ModulePathStringTable.find(ModPath);
assert(It != ModulePathStringTable.end() && "Module not registered");
return It->second.second;
/// Convenience method for creating a promoted global name
/// for the given value name of a local, and its original module's ID.
static std::string getGlobalNameForLocal(StringRef Name, ModuleHash ModHash) {
SmallString<256> NewName(Name);
NewName += ".llvm.";
NewName += utostr((uint64_t(ModHash[0]) << 32) |
ModHash[1]); // Take the first 64 bits
return NewName.str();
/// Helper to obtain the unpromoted name for a global value (or the original
/// name if not promoted).
static StringRef getOriginalNameBeforePromote(StringRef Name) {
std::pair<StringRef, StringRef> Pair = Name.split(".llvm.");
return Pair.first;
typedef ModulePathStringTableTy::value_type ModuleInfo;
/// Add a new module with the given \p Hash, mapped to the given \p
/// ModID, and return a reference to the module.
ModuleInfo *addModule(StringRef ModPath, uint64_t ModId,
ModuleHash Hash = ModuleHash{{0}}) {
return &*ModulePathStringTable.insert({ModPath, {ModId, Hash}}).first;
/// Check if the given Module has any functions available for exporting
/// in the index. We consider any module present in the ModulePathStringTable
/// to have exported functions.
bool hasExportedFunctions(const Module &M) const {
return ModulePathStringTable.count(M.getModuleIdentifier());
const std::map<std::string, TypeIdSummary> &typeIds() const {
return TypeIdMap;
/// This accessor should only be used when exporting because it can mutate the
/// map.
TypeIdSummary &getOrInsertTypeIdSummary(StringRef TypeId) {
return TypeIdMap[TypeId];
/// This returns either a pointer to the type id summary (if present in the
/// summary map) or null (if not present). This may be used when importing.
const TypeIdSummary *getTypeIdSummary(StringRef TypeId) const {
auto I = TypeIdMap.find(TypeId);
if (I == TypeIdMap.end())
return nullptr;
return &I->second;
/// Collect for the given module the list of function it defines
/// (GUID -> Summary).
void collectDefinedFunctionsForModule(StringRef ModulePath,
GVSummaryMapTy &GVSummaryMap) const;
/// Collect for each module the list of Summaries it defines (GUID ->
/// Summary).
void collectDefinedGVSummariesPerModule(
StringMap<GVSummaryMapTy> &ModuleToDefinedGVSummaries) const;
} // end namespace llvm