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//===------ Core.h -- Core ORC APIs (Layer, JITDylib, etc.) -----*- 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
//
//===----------------------------------------------------------------------===//
//
// Contains core ORC APIs.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_EXECUTIONENGINE_ORC_CORE_H
#define LLVM_EXECUTIONENGINE_ORC_CORE_H
#include "llvm/ADT/BitmaskEnum.h"
#include "llvm/ADT/FunctionExtras.h"
#include "llvm/ExecutionEngine/JITSymbol.h"
#include "llvm/ExecutionEngine/Orc/SymbolStringPool.h"
#include "llvm/ExecutionEngine/OrcV1Deprecation.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/Debug.h"
#include <memory>
#include <vector>
#define DEBUG_TYPE "orc"
namespace llvm {
namespace orc {
// Forward declare some classes.
class AsynchronousSymbolQuery;
class ExecutionSession;
class MaterializationUnit;
class MaterializationResponsibility;
class JITDylib;
enum class SymbolState : uint8_t;
/// VModuleKey provides a unique identifier (allocated and managed by
/// ExecutionSessions) for a module added to the JIT.
using VModuleKey = uint64_t;
/// A set of symbol names (represented by SymbolStringPtrs for
// efficiency).
using SymbolNameSet = DenseSet<SymbolStringPtr>;
/// A vector of symbol names.
using SymbolNameVector = std::vector<SymbolStringPtr>;
/// A map from symbol names (as SymbolStringPtrs) to JITSymbols
/// (address/flags pairs).
using SymbolMap = DenseMap<SymbolStringPtr, JITEvaluatedSymbol>;
/// A map from symbol names (as SymbolStringPtrs) to JITSymbolFlags.
using SymbolFlagsMap = DenseMap<SymbolStringPtr, JITSymbolFlags>;
/// A map from JITDylibs to sets of symbols.
using SymbolDependenceMap = DenseMap<JITDylib *, SymbolNameSet>;
/// Lookup flags that apply to each dylib in the search order for a lookup.
///
/// If MatchHiddenSymbolsOnly is used (the default) for a given dylib, then
/// only symbols in that Dylib's interface will be searched. If
/// MatchHiddenSymbols is used then symbols with hidden visibility will match
/// as well.
enum class JITDylibLookupFlags { MatchExportedSymbolsOnly, MatchAllSymbols };
/// Lookup flags that apply to each symbol in a lookup.
///
/// If RequiredSymbol is used (the default) for a given symbol then that symbol
/// must be found during the lookup or the lookup will fail returning a
/// SymbolNotFound error. If WeaklyReferencedSymbol is used and the given
/// symbol is not found then the query will continue, and no result for the
/// missing symbol will be present in the result (assuming the rest of the
/// lookup succeeds).
enum class SymbolLookupFlags { RequiredSymbol, WeaklyReferencedSymbol };
/// Describes the kind of lookup being performed. The lookup kind is passed to
/// symbol generators (if they're invoked) to help them determine what
/// definitions to generate.
///
/// Static -- Lookup is being performed as-if at static link time (e.g.
/// generators representing static archives should pull in new
/// definitions).
///
/// DLSym -- Lookup is being performed as-if at runtime (e.g. generators
/// representing static archives should not pull in new definitions).
enum class LookupKind { Static, DLSym };
/// A list of (JITDylib*, JITDylibLookupFlags) pairs to be used as a search
/// order during symbol lookup.
using JITDylibSearchOrder =
std::vector<std::pair<JITDylib *, JITDylibLookupFlags>>;
/// Convenience function for creating a search order from an ArrayRef of
/// JITDylib*, all with the same flags.
inline JITDylibSearchOrder makeJITDylibSearchOrder(
ArrayRef<JITDylib *> JDs,
JITDylibLookupFlags Flags = JITDylibLookupFlags::MatchExportedSymbolsOnly) {
JITDylibSearchOrder O;
O.reserve(JDs.size());
for (auto *JD : JDs)
O.push_back(std::make_pair(JD, Flags));
return O;
}
/// A set of symbols to look up, each associated with a SymbolLookupFlags
/// value.
///
/// This class is backed by a vector and optimized for fast insertion,
/// deletion and iteration. It does not guarantee a stable order between
/// operations, and will not automatically detect duplicate elements (they
/// can be manually checked by calling the validate method).
class SymbolLookupSet {
public:
using value_type = std::pair<SymbolStringPtr, SymbolLookupFlags>;
using UnderlyingVector = std::vector<value_type>;
using iterator = UnderlyingVector::iterator;
using const_iterator = UnderlyingVector::const_iterator;
SymbolLookupSet() = default;
explicit SymbolLookupSet(
SymbolStringPtr Name,
SymbolLookupFlags Flags = SymbolLookupFlags::RequiredSymbol) {
add(std::move(Name), Flags);
}
/// Construct a SymbolLookupSet from an initializer list of SymbolStringPtrs.
explicit SymbolLookupSet(
std::initializer_list<SymbolStringPtr> Names,
SymbolLookupFlags Flags = SymbolLookupFlags::RequiredSymbol) {
Symbols.reserve(Names.size());
for (auto &Name : Names)
add(std::move(Name), Flags);
}
/// Construct a SymbolLookupSet from a SymbolNameSet with the given
/// Flags used for each value.
explicit SymbolLookupSet(
const SymbolNameSet &Names,
SymbolLookupFlags Flags = SymbolLookupFlags::RequiredSymbol) {
Symbols.reserve(Names.size());
for (const auto &Name : Names)
add(Name, Flags);
}
/// Construct a SymbolLookupSet from a vector of symbols with the given Flags
/// used for each value.
/// If the ArrayRef contains duplicates it is up to the client to remove these
/// before using this instance for lookup.
explicit SymbolLookupSet(
ArrayRef<SymbolStringPtr> Names,
SymbolLookupFlags Flags = SymbolLookupFlags::RequiredSymbol) {
Symbols.reserve(Names.size());
for (const auto &Name : Names)
add(Name, Flags);
}
/// Add an element to the set. The client is responsible for checking that
/// duplicates are not added.
void add(SymbolStringPtr Name,
SymbolLookupFlags Flags = SymbolLookupFlags::RequiredSymbol) {
Symbols.push_back(std::make_pair(std::move(Name), Flags));
}
bool empty() const { return Symbols.empty(); }
UnderlyingVector::size_type size() const { return Symbols.size(); }
iterator begin() { return Symbols.begin(); }
iterator end() { return Symbols.end(); }
const_iterator begin() const { return Symbols.begin(); }
const_iterator end() const { return Symbols.end(); }
/// Removes the Ith element of the vector, replacing it with the last element.
void remove(UnderlyingVector::size_type I) {
std::swap(Symbols[I], Symbols.back());
Symbols.pop_back();
}
/// Removes the element pointed to by the given iterator. This iterator and
/// all subsequent ones (including end()) are invalidated.
void remove(iterator I) { remove(I - begin()); }
/// Removes all elements matching the given predicate, which must be callable
/// as bool(const SymbolStringPtr &, SymbolLookupFlags Flags).
template <typename PredFn> void remove_if(PredFn &&Pred) {
UnderlyingVector::size_type I = 0;
while (I != Symbols.size()) {
const auto &Name = Symbols[I].first;
auto Flags = Symbols[I].second;
if (Pred(Name, Flags))
remove(I);
else
++I;
}
}
/// Loop over the elements of this SymbolLookupSet, applying the Body function
/// to each one. Body must be callable as
/// bool(const SymbolStringPtr &, SymbolLookupFlags).
/// If Body returns true then the element just passed in is removed from the
/// set. If Body returns false then the element is retained.
template <typename BodyFn>
auto forEachWithRemoval(BodyFn &&Body) -> typename std::enable_if<
std::is_same<decltype(Body(std::declval<const SymbolStringPtr &>(),
std::declval<SymbolLookupFlags>())),
bool>::value>::type {
UnderlyingVector::size_type I = 0;
while (I != Symbols.size()) {
const auto &Name = Symbols[I].first;
auto Flags = Symbols[I].second;
if (Body(Name, Flags))
remove(I);
else
++I;
}
}
/// Loop over the elements of this SymbolLookupSet, applying the Body function
/// to each one. Body must be callable as
/// Expected<bool>(const SymbolStringPtr &, SymbolLookupFlags).
/// If Body returns a failure value, the loop exits immediately. If Body
/// returns true then the element just passed in is removed from the set. If
/// Body returns false then the element is retained.
template <typename BodyFn>
auto forEachWithRemoval(BodyFn &&Body) -> typename std::enable_if<
std::is_same<decltype(Body(std::declval<const SymbolStringPtr &>(),
std::declval<SymbolLookupFlags>())),
Expected<bool>>::value,
Error>::type {
UnderlyingVector::size_type I = 0;
while (I != Symbols.size()) {
const auto &Name = Symbols[I].first;
auto Flags = Symbols[I].second;
auto Remove = Body(Name, Flags);
if (!Remove)
return Remove.takeError();
if (*Remove)
remove(I);
else
++I;
}
return Error::success();
}
/// Construct a SymbolNameVector from this instance by dropping the Flags
/// values.
SymbolNameVector getSymbolNames() const {
SymbolNameVector Names;
Names.reserve(Symbols.size());
for (auto &KV : Symbols)
Names.push_back(KV.first);
return Names;
}
/// Sort the lookup set by pointer value. This sort is fast but sensitive to
/// allocation order and so should not be used where a consistent order is
/// required.
void sortByAddress() {
llvm::sort(Symbols, [](const value_type &LHS, const value_type &RHS) {
return LHS.first < RHS.first;
});
}
/// Sort the lookup set lexicographically. This sort is slow but the order
/// is unaffected by allocation order.
void sortByName() {
llvm::sort(Symbols, [](const value_type &LHS, const value_type &RHS) {
return *LHS.first < *RHS.first;
});
}
/// Remove any duplicate elements. If a SymbolLookupSet is not duplicate-free
/// by construction, this method can be used to turn it into a proper set.
void removeDuplicates() {
sortByAddress();
auto LastI = std::unique(Symbols.begin(), Symbols.end());
Symbols.erase(LastI, Symbols.end());
}
#ifndef NDEBUG
/// Returns true if this set contains any duplicates. This should only be used
/// in assertions.
bool containsDuplicates() {
if (Symbols.size() < 2)
return false;
sortByAddress();
for (UnderlyingVector::size_type I = 1; I != Symbols.size(); ++I)
if (Symbols[I].first == Symbols[I - 1].first)
return true;
return true;
}
#endif
private:
UnderlyingVector Symbols;
};
struct SymbolAliasMapEntry {
SymbolAliasMapEntry() = default;
SymbolAliasMapEntry(SymbolStringPtr Aliasee, JITSymbolFlags AliasFlags)
: Aliasee(std::move(Aliasee)), AliasFlags(AliasFlags) {}
SymbolStringPtr Aliasee;
JITSymbolFlags AliasFlags;
};
/// A map of Symbols to (Symbol, Flags) pairs.
using SymbolAliasMap = DenseMap<SymbolStringPtr, SymbolAliasMapEntry>;
/// Render a SymbolStringPtr.
raw_ostream &operator<<(raw_ostream &OS, const SymbolStringPtr &Sym);
/// Render a SymbolNameSet.
raw_ostream &operator<<(raw_ostream &OS, const SymbolNameSet &Symbols);
/// Render a SymbolNameVector.
raw_ostream &operator<<(raw_ostream &OS, const SymbolNameVector &Symbols);
/// Render a SymbolFlagsMap entry.
raw_ostream &operator<<(raw_ostream &OS, const SymbolFlagsMap::value_type &KV);
/// Render a SymbolMap entry.
raw_ostream &operator<<(raw_ostream &OS, const SymbolMap::value_type &KV);
/// Render a SymbolFlagsMap.
raw_ostream &operator<<(raw_ostream &OS, const SymbolFlagsMap &SymbolFlags);
/// Render a SymbolMap.
raw_ostream &operator<<(raw_ostream &OS, const SymbolMap &Symbols);
/// Render a SymbolDependenceMap entry.
raw_ostream &operator<<(raw_ostream &OS,
const SymbolDependenceMap::value_type &KV);
/// Render a SymbolDependendeMap.
raw_ostream &operator<<(raw_ostream &OS, const SymbolDependenceMap &Deps);
/// Render a MaterializationUnit.
raw_ostream &operator<<(raw_ostream &OS, const MaterializationUnit &MU);
//// Render a JITDylibLookupFlags instance.
raw_ostream &operator<<(raw_ostream &OS,
const JITDylibLookupFlags &JDLookupFlags);
/// Rendar a SymbolLookupFlags instance.
raw_ostream &operator<<(raw_ostream &OS, const SymbolLookupFlags &LookupFlags);
/// Render a JITDylibLookupFlags instance.
raw_ostream &operator<<(raw_ostream &OS, const LookupKind &K);
/// Render a SymbolLookupSet entry.
raw_ostream &operator<<(raw_ostream &OS, const SymbolLookupSet::value_type &KV);
/// Render a SymbolLookupSet.
raw_ostream &operator<<(raw_ostream &OS, const SymbolLookupSet &LookupSet);
/// Render a JITDylibSearchOrder.
raw_ostream &operator<<(raw_ostream &OS,
const JITDylibSearchOrder &SearchOrder);
/// Render a SymbolAliasMap.
raw_ostream &operator<<(raw_ostream &OS, const SymbolAliasMap &Aliases);
/// Render a SymbolState.
raw_ostream &operator<<(raw_ostream &OS, const SymbolState &S);
/// Render a LookupKind.
raw_ostream &operator<<(raw_ostream &OS, const LookupKind &K);
/// Callback to notify client that symbols have been resolved.
using SymbolsResolvedCallback = unique_function<void(Expected<SymbolMap>)>;
/// Callback to register the dependencies for a given query.
using RegisterDependenciesFunction =
std::function<void(const SymbolDependenceMap &)>;
/// This can be used as the value for a RegisterDependenciesFunction if there
/// are no dependants to register with.
extern RegisterDependenciesFunction NoDependenciesToRegister;
/// Used to notify a JITDylib that the given set of symbols failed to
/// materialize.
class FailedToMaterialize : public ErrorInfo<FailedToMaterialize> {
public:
static char ID;
FailedToMaterialize(std::shared_ptr<SymbolDependenceMap> Symbols);
std::error_code convertToErrorCode() const override;
void log(raw_ostream &OS) const override;
const SymbolDependenceMap &getSymbols() const { return *Symbols; }
private:
std::shared_ptr<SymbolDependenceMap> Symbols;
};
/// Used to notify clients when symbols can not be found during a lookup.
class SymbolsNotFound : public ErrorInfo<SymbolsNotFound> {
public:
static char ID;
SymbolsNotFound(SymbolNameSet Symbols);
SymbolsNotFound(SymbolNameVector Symbols);
std::error_code convertToErrorCode() const override;
void log(raw_ostream &OS) const override;
const SymbolNameVector &getSymbols() const { return Symbols; }
private:
SymbolNameVector Symbols;
};
/// Used to notify clients that a set of symbols could not be removed.
class SymbolsCouldNotBeRemoved : public ErrorInfo<SymbolsCouldNotBeRemoved> {
public:
static char ID;
SymbolsCouldNotBeRemoved(SymbolNameSet Symbols);
std::error_code convertToErrorCode() const override;
void log(raw_ostream &OS) const override;
const SymbolNameSet &getSymbols() const { return Symbols; }
private:
SymbolNameSet Symbols;
};
/// Tracks responsibility for materialization, and mediates interactions between
/// MaterializationUnits and JDs.
///
/// An instance of this class is passed to MaterializationUnits when their
/// materialize method is called. It allows MaterializationUnits to resolve and
/// emit symbols, or abandon materialization by notifying any unmaterialized
/// symbols of an error.
class MaterializationResponsibility {
friend class MaterializationUnit;
public:
MaterializationResponsibility(MaterializationResponsibility &&) = default;
MaterializationResponsibility &
operator=(MaterializationResponsibility &&) = delete;
/// Destruct a MaterializationResponsibility instance. In debug mode
/// this asserts that all symbols being tracked have been either
/// emitted or notified of an error.
~MaterializationResponsibility();
/// Returns the target JITDylib that these symbols are being materialized
/// into.
JITDylib &getTargetJITDylib() const { return JD; }
/// Returns the VModuleKey for this instance.
VModuleKey getVModuleKey() const { return K; }
/// Returns the symbol flags map for this responsibility instance.
/// Note: The returned flags may have transient flags (Lazy, Materializing)
/// set. These should be stripped with JITSymbolFlags::stripTransientFlags
/// before using.
const SymbolFlagsMap &getSymbols() const { return SymbolFlags; }
/// Returns the names of any symbols covered by this
/// MaterializationResponsibility object that have queries pending. This
/// information can be used to return responsibility for unrequested symbols
/// back to the JITDylib via the delegate method.
SymbolNameSet getRequestedSymbols() const;
/// Notifies the target JITDylib that the given symbols have been resolved.
/// This will update the given symbols' addresses in the JITDylib, and notify
/// any pending queries on the given symbols of their resolution. The given
/// symbols must be ones covered by this MaterializationResponsibility
/// instance. Individual calls to this method may resolve a subset of the
/// symbols, but all symbols must have been resolved prior to calling emit.
///
/// This method will return an error if any symbols being resolved have been
/// moved to the error state due to the failure of a dependency. If this
/// method returns an error then clients should log it and call
/// failMaterialize. If no dependencies have been registered for the
/// symbols covered by this MaterializationResponsibiility then this method
/// is guaranteed to return Error::success() and can be wrapped with cantFail.
Error notifyResolved(const SymbolMap &Symbols);
/// Notifies the target JITDylib (and any pending queries on that JITDylib)
/// that all symbols covered by this MaterializationResponsibility instance
/// have been emitted.
///
/// This method will return an error if any symbols being resolved have been
/// moved to the error state due to the failure of a dependency. If this
/// method returns an error then clients should log it and call
/// failMaterialize. If no dependencies have been registered for the
/// symbols covered by this MaterializationResponsibiility then this method
/// is guaranteed to return Error::success() and can be wrapped with cantFail.
Error notifyEmitted();
/// Attempt to claim responsibility for new definitions. This method can be
/// used to claim responsibility for symbols that are added to a
/// materialization unit during the compilation process (e.g. literal pool
/// symbols). Symbol linkage rules are the same as for symbols that are
/// defined up front: duplicate strong definitions will result in errors.
/// Duplicate weak definitions will be discarded (in which case they will
/// not be added to this responsibility instance).
///
/// This method can be used by materialization units that want to add
/// additional symbols at materialization time (e.g. stubs, compile
/// callbacks, metadata).
Error defineMaterializing(SymbolFlagsMap SymbolFlags);
/// Notify all not-yet-emitted covered by this MaterializationResponsibility
/// instance that an error has occurred.
/// This will remove all symbols covered by this MaterializationResponsibilty
/// from the target JITDylib, and send an error to any queries waiting on
/// these symbols.
void failMaterialization();
/// Transfers responsibility to the given MaterializationUnit for all
/// symbols defined by that MaterializationUnit. This allows
/// materializers to break up work based on run-time information (e.g.
/// by introspecting which symbols have actually been looked up and
/// materializing only those).
void replace(std::unique_ptr<MaterializationUnit> MU);
/// Delegates responsibility for the given symbols to the returned
/// materialization responsibility. Useful for breaking up work between
/// threads, or different kinds of materialization processes.
MaterializationResponsibility delegate(const SymbolNameSet &Symbols,
VModuleKey NewKey = VModuleKey());
void addDependencies(const SymbolStringPtr &Name,
const SymbolDependenceMap &Dependencies);
/// Add dependencies that apply to all symbols covered by this instance.
void addDependenciesForAll(const SymbolDependenceMap &Dependencies);
private:
/// Create a MaterializationResponsibility for the given JITDylib and
/// initial symbols.
MaterializationResponsibility(JITDylib &JD, SymbolFlagsMap SymbolFlags,
VModuleKey K);
JITDylib &JD;
SymbolFlagsMap SymbolFlags;
VModuleKey K;
};
/// A MaterializationUnit represents a set of symbol definitions that can
/// be materialized as a group, or individually discarded (when
/// overriding definitions are encountered).
///
/// MaterializationUnits are used when providing lazy definitions of symbols to
/// JITDylibs. The JITDylib will call materialize when the address of a symbol
/// is requested via the lookup method. The JITDylib will call discard if a
/// stronger definition is added or already present.
class MaterializationUnit {
public:
MaterializationUnit(SymbolFlagsMap InitalSymbolFlags, VModuleKey K)
: SymbolFlags(std::move(InitalSymbolFlags)), K(std::move(K)) {}
virtual ~MaterializationUnit() {}
/// Return the name of this materialization unit. Useful for debugging
/// output.
virtual StringRef getName() const = 0;
/// Return the set of symbols that this source provides.
const SymbolFlagsMap &getSymbols() const { return SymbolFlags; }
/// Called by materialization dispatchers (see
/// ExecutionSession::DispatchMaterializationFunction) to trigger
/// materialization of this MaterializationUnit.
void doMaterialize(JITDylib &JD) {
materialize(MaterializationResponsibility(JD, std::move(SymbolFlags),
std::move(K)));
}
/// Called by JITDylibs to notify MaterializationUnits that the given symbol
/// has been overridden.
void doDiscard(const JITDylib &JD, const SymbolStringPtr &Name) {
SymbolFlags.erase(Name);
discard(JD, std::move(Name));
}
protected:
SymbolFlagsMap SymbolFlags;
VModuleKey K;
private:
virtual void anchor();
/// Implementations of this method should materialize all symbols
/// in the materialzation unit, except for those that have been
/// previously discarded.
virtual void materialize(MaterializationResponsibility R) = 0;
/// Implementations of this method should discard the given symbol
/// from the source (e.g. if the source is an LLVM IR Module and the
/// symbol is a function, delete the function body or mark it available
/// externally).
virtual void discard(const JITDylib &JD, const SymbolStringPtr &Name) = 0;
};
using MaterializationUnitList =
std::vector<std::unique_ptr<MaterializationUnit>>;
/// A MaterializationUnit implementation for pre-existing absolute symbols.
///
/// All symbols will be resolved and marked ready as soon as the unit is
/// materialized.
class AbsoluteSymbolsMaterializationUnit : public MaterializationUnit {
public:
AbsoluteSymbolsMaterializationUnit(SymbolMap Symbols, VModuleKey K);
StringRef getName() const override;
private:
void materialize(MaterializationResponsibility R) override;
void discard(const JITDylib &JD, const SymbolStringPtr &Name) override;
static SymbolFlagsMap extractFlags(const SymbolMap &Symbols);
SymbolMap Symbols;
};
/// Create an AbsoluteSymbolsMaterializationUnit with the given symbols.
/// Useful for inserting absolute symbols into a JITDylib. E.g.:
/// \code{.cpp}
/// JITDylib &JD = ...;
/// SymbolStringPtr Foo = ...;
/// JITEvaluatedSymbol FooSym = ...;
/// if (auto Err = JD.define(absoluteSymbols({{Foo, FooSym}})))
/// return Err;
/// \endcode
///
inline std::unique_ptr<AbsoluteSymbolsMaterializationUnit>
absoluteSymbols(SymbolMap Symbols, VModuleKey K = VModuleKey()) {
return std::make_unique<AbsoluteSymbolsMaterializationUnit>(
std::move(Symbols), std::move(K));
}
/// A materialization unit for symbol aliases. Allows existing symbols to be
/// aliased with alternate flags.
class ReExportsMaterializationUnit : public MaterializationUnit {
public:
/// SourceJD is allowed to be nullptr, in which case the source JITDylib is
/// taken to be whatever JITDylib these definitions are materialized in (and
/// MatchNonExported has no effect). This is useful for defining aliases
/// within a JITDylib.
///
/// Note: Care must be taken that no sets of aliases form a cycle, as such
/// a cycle will result in a deadlock when any symbol in the cycle is
/// resolved.
ReExportsMaterializationUnit(JITDylib *SourceJD,
JITDylibLookupFlags SourceJDLookupFlags,
SymbolAliasMap Aliases, VModuleKey K);
StringRef getName() const override;
private:
void materialize(MaterializationResponsibility R) override;
void discard(const JITDylib &JD, const SymbolStringPtr &Name) override;
static SymbolFlagsMap extractFlags(const SymbolAliasMap &Aliases);
JITDylib *SourceJD = nullptr;
JITDylibLookupFlags SourceJDLookupFlags;
SymbolAliasMap Aliases;
};
/// Create a ReExportsMaterializationUnit with the given aliases.
/// Useful for defining symbol aliases.: E.g., given a JITDylib JD containing
/// symbols "foo" and "bar", we can define aliases "baz" (for "foo") and "qux"
/// (for "bar") with: \code{.cpp}
/// SymbolStringPtr Baz = ...;
/// SymbolStringPtr Qux = ...;
/// if (auto Err = JD.define(symbolAliases({
/// {Baz, { Foo, JITSymbolFlags::Exported }},
/// {Qux, { Bar, JITSymbolFlags::Weak }}}))
/// return Err;
/// \endcode
inline std::unique_ptr<ReExportsMaterializationUnit>
symbolAliases(SymbolAliasMap Aliases, VModuleKey K = VModuleKey()) {
return std::make_unique<ReExportsMaterializationUnit>(
nullptr, JITDylibLookupFlags::MatchAllSymbols, std::move(Aliases),
std::move(K));
}
/// Create a materialization unit for re-exporting symbols from another JITDylib
/// with alternative names/flags.
/// SourceJD will be searched using the given JITDylibLookupFlags.
inline std::unique_ptr<ReExportsMaterializationUnit>
reexports(JITDylib &SourceJD, SymbolAliasMap Aliases,
JITDylibLookupFlags SourceJDLookupFlags =
JITDylibLookupFlags::MatchExportedSymbolsOnly,
VModuleKey K = VModuleKey()) {
return std::make_unique<ReExportsMaterializationUnit>(
&SourceJD, SourceJDLookupFlags, std::move(Aliases), std::move(K));
}
/// Build a SymbolAliasMap for the common case where you want to re-export
/// symbols from another JITDylib with the same linkage/flags.
Expected<SymbolAliasMap>
buildSimpleReexportsAAliasMap(JITDylib &SourceJD, const SymbolNameSet &Symbols);
/// Represents the state that a symbol has reached during materialization.
enum class SymbolState : uint8_t {
Invalid, /// No symbol should be in this state.
NeverSearched, /// Added to the symbol table, never queried.
Materializing, /// Queried, materialization begun.
Resolved, /// Assigned address, still materializing.
Emitted, /// Emitted to memory, but waiting on transitive dependencies.
Ready = 0x3f /// Ready and safe for clients to access.
};
/// A symbol query that returns results via a callback when results are
/// ready.
///
/// makes a callback when all symbols are available.
class AsynchronousSymbolQuery {
friend class ExecutionSession;
friend class JITDylib;
friend class JITSymbolResolverAdapter;
public:
/// Create a query for the given symbols. The NotifyComplete
/// callback will be called once all queried symbols reach the given
/// minimum state.
AsynchronousSymbolQuery(const SymbolLookupSet &Symbols,
SymbolState RequiredState,
SymbolsResolvedCallback NotifyComplete);
/// Notify the query that a requested symbol has reached the required state.
void notifySymbolMetRequiredState(const SymbolStringPtr &Name,
JITEvaluatedSymbol Sym);
/// Remove a symbol from the query. This is used to drop weakly referenced
/// symbols that are not found.
void dropSymbol(const SymbolStringPtr &Name) {
assert(ResolvedSymbols.count(Name) &&
"Redundant removal of weakly-referenced symbol");
ResolvedSymbols.erase(Name);
--OutstandingSymbolsCount;
}
/// Returns true if all symbols covered by this query have been
/// resolved.
bool isComplete() const { return OutstandingSymbolsCount == 0; }
/// Call the NotifyComplete callback.
///
/// This should only be called if all symbols covered by the query have
/// reached the specified state.
void handleComplete();
private:
SymbolState getRequiredState() { return RequiredState; }
void addQueryDependence(JITDylib &JD, SymbolStringPtr Name);
void removeQueryDependence(JITDylib &JD, const SymbolStringPtr &Name);
bool canStillFail();
void handleFailed(Error Err);
void detach();
SymbolsResolvedCallback NotifyComplete;
SymbolDependenceMap QueryRegistrations;
SymbolMap ResolvedSymbols;
size_t OutstandingSymbolsCount;
SymbolState RequiredState;
};
/// A symbol table that supports asynchoronous symbol queries.
///
/// Represents a virtual shared object. Instances can not be copied or moved, so
/// their addresses may be used as keys for resource management.
/// JITDylib state changes must be made via an ExecutionSession to guarantee
/// that they are synchronized with respect to other JITDylib operations.
class JITDylib {
friend class AsynchronousSymbolQuery;
friend class ExecutionSession;
friend class MaterializationResponsibility;
public:
/// Definition generators can be attached to JITDylibs to generate new
/// definitions for otherwise unresolved symbols during lookup.
class DefinitionGenerator {
public:
virtual ~DefinitionGenerator();
/// DefinitionGenerators should override this method to insert new
/// definitions into the parent JITDylib. K specifies the kind of this
/// lookup. JD specifies the target JITDylib being searched, and
/// JDLookupFlags specifies whether the search should match against
/// hidden symbols. Finally, Symbols describes the set of unresolved
/// symbols and their associated lookup flags.
virtual Error tryToGenerate(LookupKind K, JITDylib &JD,
JITDylibLookupFlags JDLookupFlags,
const SymbolLookupSet &LookupSet) = 0;
};
using AsynchronousSymbolQuerySet =
std::set<std::shared_ptr<AsynchronousSymbolQuery>>;
JITDylib(const JITDylib &) = delete;
JITDylib &operator=(const JITDylib &) = delete;
JITDylib(JITDylib &&) = delete;
JITDylib &operator=(JITDylib &&) = delete;
/// Get the name for this JITDylib.
const std::string &getName() const { return JITDylibName; }
/// Get a reference to the ExecutionSession for this JITDylib.
ExecutionSession &getExecutionSession() const { return ES; }
/// Adds a definition generator to this JITDylib and returns a referenece to
/// it.
///
/// When JITDylibs are searched during lookup, if no existing definition of
/// a symbol is found, then any generators that have been added are run (in
/// the order that they were added) to potentially generate a definition.
template <typename GeneratorT>
GeneratorT &addGenerator(std::unique_ptr<GeneratorT> DefGenerator);
/// Remove a definition generator from this JITDylib.
///
/// The given generator must exist in this JITDylib's generators list (i.e.
/// have been added and not yet removed).
void removeGenerator(DefinitionGenerator &G);
/// Set the search order to be used when fixing up definitions in JITDylib.
/// This will replace the previous search order, and apply to any symbol
/// resolutions made for definitions in this JITDylib after the call to
/// setSearchOrder (even if the definition itself was added before the
/// call).
///
/// If SearchThisJITDylibFirst is set, which by default it is, then this
/// JITDylib will add itself to the beginning of the SearchOrder (Clients
/// should *not* put this JITDylib in the list in this case, to avoid
/// redundant lookups).
///
/// If SearchThisJITDylibFirst is false then the search order will be used as
/// given. The main motivation for this feature is to support deliberate
/// shadowing of symbols in this JITDylib by a facade JITDylib. For example,
/// the facade may resolve function names to stubs, and the stubs may compile
/// lazily by looking up symbols in this dylib. Adding the facade dylib
/// as the first in the search order (instead of this dylib) ensures that
/// definitions within this dylib resolve to the lazy-compiling stubs,
/// rather than immediately materializing the definitions in this dylib.
void setSearchOrder(JITDylibSearchOrder NewSearchOrder,
bool SearchThisJITDylibFirst = true);
/// Add the given JITDylib to the search order for definitions in this
/// JITDylib.
void addToSearchOrder(JITDylib &JD,
JITDylibLookupFlags JDLookupFlags =
JITDylibLookupFlags::MatchExportedSymbolsOnly);
/// Replace OldJD with NewJD in the search order if OldJD is present.
/// Otherwise this operation is a no-op.
void replaceInSearchOrder(JITDylib &OldJD, JITDylib &NewJD,
JITDylibLookupFlags JDLookupFlags =
JITDylibLookupFlags::MatchExportedSymbolsOnly);
/// Remove the given JITDylib from the search order for this JITDylib if it is
/// present. Otherwise this operation is a no-op.
void removeFromSearchOrder(JITDylib &JD);
/// Do something with the search order (run under the session lock).
template <typename Func>
auto withSearchOrderDo(Func &&F)
-> decltype(F(std::declval<const JITDylibSearchOrder &>()));
/// Define all symbols provided by the materialization unit to be part of this
/// JITDylib.
///
/// This overload always takes ownership of the MaterializationUnit. If any
/// errors occur, the MaterializationUnit consumed.
template <typename MaterializationUnitType>
Error define(std::unique_ptr<MaterializationUnitType> &&MU);
/// Define all symbols provided by the materialization unit to be part of this
/// JITDylib.
///
/// This overload only takes ownership of the MaterializationUnit no error is
/// generated. If an error occurs, ownership remains with the caller. This
/// may allow the caller to modify the MaterializationUnit to correct the
/// issue, then re-call define.
template <typename MaterializationUnitType>
Error define(std::unique_ptr<MaterializationUnitType> &MU);
/// Tries to remove the given symbols.
///
/// If any symbols are not defined in this JITDylib this method will return
/// a SymbolsNotFound error covering the missing symbols.
///
/// If all symbols are found but some symbols are in the process of being
/// materialized this method will return a SymbolsCouldNotBeRemoved error.
///
/// On success, all symbols are removed. On failure, the JITDylib state is
/// left unmodified (no symbols are removed).
Error remove(const SymbolNameSet &Names);
/// Search the given JITDylib for the symbols in Symbols. If found, store
/// the flags for each symbol in Flags. If any required symbols are not found
/// then an error will be returned.
Expected<SymbolFlagsMap> lookupFlags(LookupKind K,
JITDylibLookupFlags JDLookupFlags,
SymbolLookupSet LookupSet);
/// Dump current JITDylib state to OS.
void dump(raw_ostream &OS);
/// FIXME: Remove this when we remove the old ORC layers.
/// Search the given JITDylibs in order for the symbols in Symbols. Results
/// (once they become available) will be returned via the given Query.
///
/// If any symbol is not found then the unresolved symbols will be returned,
/// and the query will not be applied. The Query is not failed and can be
/// re-used in a subsequent lookup once the symbols have been added, or
/// manually failed.
Expected<SymbolNameSet>
legacyLookup(std::shared_ptr<AsynchronousSymbolQuery> Q, SymbolNameSet Names);
private:
using AsynchronousSymbolQueryList =
std::vector<std::shared_ptr<AsynchronousSymbolQuery>>;
struct UnmaterializedInfo {
UnmaterializedInfo(std::unique_ptr<MaterializationUnit> MU)
: MU(std::move(MU)) {}
std::unique_ptr<MaterializationUnit> MU;
};
using UnmaterializedInfosMap =
DenseMap<SymbolStringPtr, std::shared_ptr<UnmaterializedInfo>>;
struct MaterializingInfo {
SymbolDependenceMap Dependants;
SymbolDependenceMap UnemittedDependencies;
void addQuery(std::shared_ptr<AsynchronousSymbolQuery> Q);
void removeQuery(const AsynchronousSymbolQuery &Q);
AsynchronousSymbolQueryList takeQueriesMeeting(SymbolState RequiredState);
AsynchronousSymbolQueryList takeAllPendingQueries() {
return std::move(PendingQueries);
}
bool hasQueriesPending() const { return !PendingQueries.empty(); }
const AsynchronousSymbolQueryList &pendingQueries() const {
return PendingQueries;
}
private:
AsynchronousSymbolQueryList PendingQueries;
};
using MaterializingInfosMap = DenseMap<SymbolStringPtr, MaterializingInfo>;
class SymbolTableEntry {
public:
SymbolTableEntry() = default;
SymbolTableEntry(JITSymbolFlags Flags)
: Flags(Flags), State(static_cast<uint8_t>(SymbolState::NeverSearched)),
MaterializerAttached(false), PendingRemoval(false) {}
JITTargetAddress getAddress() const { return Addr; }
JITSymbolFlags getFlags() const { return Flags; }
SymbolState getState() const { return static_cast<SymbolState>(State); }
bool isInMaterializationPhase() const {
return getState() == SymbolState::Materializing ||
getState() == SymbolState::Resolved;
}
bool hasMaterializerAttached() const { return MaterializerAttached; }
bool isPendingRemoval() const { return PendingRemoval; }
void setAddress(JITTargetAddress Addr) { this->Addr = Addr; }
void setFlags(JITSymbolFlags Flags) { this->Flags = Flags; }
void setState(SymbolState State) {
assert(static_cast<uint8_t>(State) < (1 << 6) &&
"State does not fit in bitfield");
this->State = static_cast<uint8_t>(State);
}
void setMaterializerAttached(bool MaterializerAttached) {
this->MaterializerAttached = MaterializerAttached;
}
void setPendingRemoval(bool PendingRemoval) {
this->PendingRemoval = PendingRemoval;
}
JITEvaluatedSymbol getSymbol() const {
return JITEvaluatedSymbol(Addr, Flags);
}
private:
JITTargetAddress Addr = 0;
JITSymbolFlags Flags;
uint8_t State : 6;
uint8_t MaterializerAttached : 1;
uint8_t PendingRemoval : 1;
};
using SymbolTable = DenseMap<SymbolStringPtr, SymbolTableEntry>;
JITDylib(ExecutionSession &ES, std::string Name);
Error defineImpl(MaterializationUnit &MU);
void lookupFlagsImpl(SymbolFlagsMap &Result, LookupKind K,
JITDylibLookupFlags JDLookupFlags,
SymbolLookupSet &Unresolved);
Error lodgeQuery(MaterializationUnitList &MUs,
std::shared_ptr<AsynchronousSymbolQuery> &Q, LookupKind K,
JITDylibLookupFlags JDLookupFlags,
SymbolLookupSet &Unresolved);
Error lodgeQueryImpl(MaterializationUnitList &MUs,
std::shared_ptr<AsynchronousSymbolQuery> &Q,
LookupKind K, JITDylibLookupFlags JDLookupFlags,
SymbolLookupSet &Unresolved);
bool lookupImpl(std::shared_ptr<AsynchronousSymbolQuery> &Q,
std::vector<std::unique_ptr<MaterializationUnit>> &MUs,
SymbolLookupSet &Unresolved);
void detachQueryHelper(AsynchronousSymbolQuery &Q,
const SymbolNameSet &QuerySymbols);
void transferEmittedNodeDependencies(MaterializingInfo &DependantMI,
const SymbolStringPtr &DependantName,
MaterializingInfo &EmittedMI);
Expected<SymbolFlagsMap> defineMaterializing(SymbolFlagsMap SymbolFlags);
void replace(std::unique_ptr<MaterializationUnit> MU);
SymbolNameSet getRequestedSymbols(const SymbolFlagsMap &SymbolFlags) const;
void addDependencies(const SymbolStringPtr &Name,
const SymbolDependenceMap &Dependants);
Error resolve(const SymbolMap &Resolved);
Error emit(const SymbolFlagsMap &Emitted);
using FailedSymbolsWorklist =
std::vector<std::pair<JITDylib *, SymbolStringPtr>>;
static void notifyFailed(FailedSymbolsWorklist FailedSymbols);
ExecutionSession &ES;
std::string JITDylibName;
SymbolTable Symbols;
UnmaterializedInfosMap UnmaterializedInfos;
MaterializingInfosMap MaterializingInfos;
std::vector<std::unique_ptr<DefinitionGenerator>> DefGenerators;
JITDylibSearchOrder SearchOrder;
};
/// An ExecutionSession represents a running JIT program.
class ExecutionSession {
// FIXME: Remove this when we remove the old ORC layers.
friend class JITDylib;
public:
/// For reporting errors.
using ErrorReporter = std::function<void(Error)>;
/// For dispatching MaterializationUnit::materialize calls.
using DispatchMaterializationFunction = std::function<void(
JITDylib &JD, std::unique_ptr<MaterializationUnit> MU)>;
/// Construct an ExecutionSession.
///
/// SymbolStringPools may be shared between ExecutionSessions.
ExecutionSession(std::shared_ptr<SymbolStringPool> SSP = nullptr);
/// Add a symbol name to the SymbolStringPool and return a pointer to it.
SymbolStringPtr intern(StringRef SymName) { return SSP->intern(SymName); }
/// Returns a shared_ptr to the SymbolStringPool for this ExecutionSession.
std::shared_ptr<SymbolStringPool> getSymbolStringPool() const { return SSP; }
/// Run the given lambda with the session mutex locked.
template <typename Func> auto runSessionLocked(Func &&F) -> decltype(F()) {
std::lock_guard<std::recursive_mutex> Lock(SessionMutex);
return F();
}
/// Return a pointer to the "name" JITDylib.
/// Ownership of JITDylib remains within Execution Session
JITDylib *getJITDylibByName(StringRef Name);
/// Add a new JITDylib to this ExecutionSession.
///
/// The JITDylib Name is required to be unique. Clients should verify that
/// names are not being re-used (e.g. by calling getJITDylibByName) if names
/// are based on user input.
JITDylib &createJITDylib(std::string Name);
/// Allocate a module key for a new module to add to the JIT.
VModuleKey allocateVModule() {
return runSessionLocked([this]() { return ++LastKey; });
}
/// Return a module key to the ExecutionSession so that it can be
/// re-used. This should only be done once all resources associated
/// with the original key have been released.
void releaseVModule(VModuleKey Key) { /* FIXME: Recycle keys */
}
/// Set the error reporter function.
ExecutionSession &setErrorReporter(ErrorReporter ReportError) {
this->ReportError = std::move(ReportError);
return *this;
}
/// Report a error for this execution session.
///
/// Unhandled errors can be sent here to log them.
void reportError(Error Err) { ReportError(std::move(Err)); }
/// Set the materialization dispatch function.
ExecutionSession &setDispatchMaterialization(
DispatchMaterializationFunction DispatchMaterialization) {
this->DispatchMaterialization = std::move(DispatchMaterialization);
return *this;
}
void legacyFailQuery(AsynchronousSymbolQuery &Q, Error Err);
using LegacyAsyncLookupFunction = std::function<SymbolNameSet(
std::shared_ptr<AsynchronousSymbolQuery> Q, SymbolNameSet Names)>;
/// A legacy lookup function for JITSymbolResolverAdapter.
/// Do not use -- this will be removed soon.
Expected<SymbolMap>
legacyLookup(LegacyAsyncLookupFunction AsyncLookup, SymbolNameSet Names,
SymbolState RequiredState,
RegisterDependenciesFunction RegisterDependencies);
/// Search the given JITDylib list for the given symbols.
///
/// SearchOrder lists the JITDylibs to search. For each dylib, the associated
/// boolean indicates whether the search should match against non-exported
/// (hidden visibility) symbols in that dylib (true means match against
/// non-exported symbols, false means do not match).
///
/// The NotifyComplete callback will be called once all requested symbols
/// reach the required state.
///
/// If all symbols are found, the RegisterDependencies function will be called
/// while the session lock is held. This gives clients a chance to register
/// dependencies for on the queried symbols for any symbols they are
/// materializing (if a MaterializationResponsibility instance is present,
/// this can be implemented by calling
/// MaterializationResponsibility::addDependencies). If there are no
/// dependenant symbols for this query (e.g. it is being made by a top level
/// client to get an address to call) then the value NoDependenciesToRegister
/// can be used.
void lookup(LookupKind K, const JITDylibSearchOrder &SearchOrder,
SymbolLookupSet Symbols, SymbolState RequiredState,
SymbolsResolvedCallback NotifyComplete,
RegisterDependenciesFunction RegisterDependencies);
/// Blocking version of lookup above. Returns the resolved symbol map.
/// If WaitUntilReady is true (the default), will not return until all
/// requested symbols are ready (or an error occurs). If WaitUntilReady is
/// false, will return as soon as all requested symbols are resolved,
/// or an error occurs. If WaitUntilReady is false and an error occurs
/// after resolution, the function will return a success value, but the
/// error will be reported via reportErrors.
Expected<SymbolMap> lookup(const JITDylibSearchOrder &SearchOrder,
const SymbolLookupSet &Symbols,
LookupKind K = LookupKind::Static,
SymbolState RequiredState = SymbolState::Ready,
RegisterDependenciesFunction RegisterDependencies =
NoDependenciesToRegister);
/// Convenience version of blocking lookup.
/// Searches each of the JITDylibs in the search order in turn for the given
/// symbol.
Expected<JITEvaluatedSymbol> lookup(const JITDylibSearchOrder &SearchOrder,
SymbolStringPtr Symbol);
/// Convenience version of blocking lookup.
/// Searches each of the JITDylibs in the search order in turn for the given
/// symbol. The search will not find non-exported symbols.
Expected<JITEvaluatedSymbol> lookup(ArrayRef<JITDylib *> SearchOrder,
SymbolStringPtr Symbol);
/// Convenience version of blocking lookup.
/// Searches each of the JITDylibs in the search order in turn for the given
/// symbol. The search will not find non-exported symbols.
Expected<JITEvaluatedSymbol> lookup(ArrayRef<JITDylib *> SearchOrder,
StringRef Symbol);
/// Materialize the given unit.
void dispatchMaterialization(JITDylib &JD,
std::unique_ptr<MaterializationUnit> MU) {
LLVM_DEBUG({
runSessionLocked([&]() {
dbgs() << "Dispatching " << *MU << " for " << JD.getName() << "\n";
});
});
DispatchMaterialization(JD, std::move(MU));
}
/// Dump the state of all the JITDylibs in this session.
void dump(raw_ostream &OS);
private:
static void logErrorsToStdErr(Error Err) {
logAllUnhandledErrors(std::move(Err), errs(), "JIT session error: ");
}
static void
materializeOnCurrentThread(JITDylib &JD,
std::unique_ptr<MaterializationUnit> MU) {
MU->doMaterialize(JD);
}
void runOutstandingMUs();
mutable std::recursive_mutex SessionMutex;
std::shared_ptr<SymbolStringPool> SSP;
VModuleKey LastKey = 0;
ErrorReporter ReportError = logErrorsToStdErr;
DispatchMaterializationFunction DispatchMaterialization =
materializeOnCurrentThread;
std::vector<std::unique_ptr<JITDylib>> JDs;
// FIXME: Remove this (and runOutstandingMUs) once the linking layer works
// with callbacks from asynchronous queries.
mutable std::recursive_mutex OutstandingMUsMutex;
std::vector<std::pair<JITDylib *, std::unique_ptr<MaterializationUnit>>>
OutstandingMUs;
};
template <typename GeneratorT>
GeneratorT &JITDylib::addGenerator(std::unique_ptr<GeneratorT> DefGenerator) {
auto &G = *DefGenerator;
ES.runSessionLocked(
[&]() { DefGenerators.push_back(std::move(DefGenerator)); });
return G;
}
template <typename Func>
auto JITDylib::withSearchOrderDo(Func &&F)
-> decltype(F(std::declval<const JITDylibSearchOrder &>())) {
return ES.runSessionLocked([&]() { return F(SearchOrder); });
}
template <typename MaterializationUnitType>
Error JITDylib::define(std::unique_ptr<MaterializationUnitType> &&MU) {
assert(MU && "Can not define with a null MU");
return ES.runSessionLocked([&, this]() -> Error {
if (auto Err = defineImpl(*MU))
return Err;
/// defineImpl succeeded.
auto UMI = std::make_shared<UnmaterializedInfo>(std::move(MU));
for (auto &KV : UMI->MU->getSymbols())
UnmaterializedInfos[KV.first] = UMI;
return Error::success();
});
}
template <typename MaterializationUnitType>
Error JITDylib::define(std::unique_ptr<MaterializationUnitType> &MU) {
assert(MU && "Can not define with a null MU");
return ES.runSessionLocked([&, this]() -> Error {
if (auto Err = defineImpl(*MU))
return Err;
/// defineImpl succeeded.
auto UMI = std::make_shared<UnmaterializedInfo>(std::move(MU));
for (auto &KV : UMI->MU->getSymbols())
UnmaterializedInfos[KV.first] = UMI;
return Error::success();
});
}
/// ReexportsGenerator can be used with JITDylib::addGenerator to automatically
/// re-export a subset of the source JITDylib's symbols in the target.
class ReexportsGenerator : public JITDylib::DefinitionGenerator {
public:
using SymbolPredicate = std::function<bool(SymbolStringPtr)>;
/// Create a reexports generator. If an Allow predicate is passed, only
/// symbols for which the predicate returns true will be reexported. If no
/// Allow predicate is passed, all symbols will be exported.
ReexportsGenerator(JITDylib &SourceJD,
JITDylibLookupFlags SourceJDLookupFlags,
SymbolPredicate Allow = SymbolPredicate());
Error tryToGenerate(LookupKind K, JITDylib &JD,
JITDylibLookupFlags JDLookupFlags,
const SymbolLookupSet &LookupSet) override;
private:
JITDylib &SourceJD;
JITDylibLookupFlags SourceJDLookupFlags;
SymbolPredicate Allow;
};
/// Mangles symbol names then uniques them in the context of an
/// ExecutionSession.
class MangleAndInterner {
public:
MangleAndInterner(ExecutionSession &ES, const DataLayout &DL);
SymbolStringPtr operator()(StringRef Name);
private:
ExecutionSession &ES;
const DataLayout &DL;
};
} // End namespace orc
} // End namespace llvm
#undef DEBUG_TYPE // "orc"
#endif // LLVM_EXECUTIONENGINE_ORC_CORE_H
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