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//===--- Legacy.h -- Adapters for ExecutionEngine API interop ---*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Contains core ORC APIs.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_EXECUTIONENGINE_ORC_LEGACY_H
#define LLVM_EXECUTIONENGINE_ORC_LEGACY_H
#include "llvm/ExecutionEngine/JITSymbol.h"
#include "llvm/ExecutionEngine/Orc/Core.h"
namespace llvm {
namespace orc {
/// SymbolResolver is a composable interface for looking up symbol flags
/// and addresses using the AsynchronousSymbolQuery type. It will
/// eventually replace the LegacyJITSymbolResolver interface as the
/// stardard ORC symbol resolver type.
///
/// FIXME: SymbolResolvers should go away and be replaced with VSOs with
/// defenition generators.
class SymbolResolver {
public:
virtual ~SymbolResolver() = default;
/// Returns the flags for each symbol in Symbols that can be found,
/// along with the set of symbol that could not be found.
virtual SymbolFlagsMap lookupFlags(const SymbolNameSet &Symbols) = 0;
/// For each symbol in Symbols that can be found, assigns that symbols
/// value in Query. Returns the set of symbols that could not be found.
virtual SymbolNameSet lookup(std::shared_ptr<AsynchronousSymbolQuery> Query,
SymbolNameSet Symbols) = 0;
private:
virtual void anchor();
};
/// Implements SymbolResolver with a pair of supplied function objects
/// for convenience. See createSymbolResolver.
template <typename LookupFlagsFn, typename LookupFn>
class LambdaSymbolResolver final : public SymbolResolver {
public:
template <typename LookupFlagsFnRef, typename LookupFnRef>
LambdaSymbolResolver(LookupFlagsFnRef &&LookupFlags, LookupFnRef &&Lookup)
: LookupFlags(std::forward<LookupFlagsFnRef>(LookupFlags)),
Lookup(std::forward<LookupFnRef>(Lookup)) {}
SymbolFlagsMap lookupFlags(const SymbolNameSet &Symbols) final {
return LookupFlags(Symbols);
}
SymbolNameSet lookup(std::shared_ptr<AsynchronousSymbolQuery> Query,
SymbolNameSet Symbols) final {
return Lookup(std::move(Query), std::move(Symbols));
}
private:
LookupFlagsFn LookupFlags;
LookupFn Lookup;
};
/// Creates a SymbolResolver implementation from the pair of supplied
/// function objects.
template <typename LookupFlagsFn, typename LookupFn>
std::unique_ptr<LambdaSymbolResolver<
typename std::remove_cv<
typename std::remove_reference<LookupFlagsFn>::type>::type,
typename std::remove_cv<
typename std::remove_reference<LookupFn>::type>::type>>
createSymbolResolver(LookupFlagsFn &&LookupFlags, LookupFn &&Lookup) {
using LambdaSymbolResolverImpl = LambdaSymbolResolver<
typename std::remove_cv<
typename std::remove_reference<LookupFlagsFn>::type>::type,
typename std::remove_cv<
typename std::remove_reference<LookupFn>::type>::type>;
return llvm::make_unique<LambdaSymbolResolverImpl>(
std::forward<LookupFlagsFn>(LookupFlags), std::forward<LookupFn>(Lookup));
}
class JITSymbolResolverAdapter : public JITSymbolResolver {
public:
JITSymbolResolverAdapter(ExecutionSession &ES, SymbolResolver &R,
MaterializationResponsibility *MR);
Expected<LookupFlagsResult> lookupFlags(const LookupSet &Symbols) override;
Expected<LookupResult> lookup(const LookupSet &Symbols) override;
private:
ExecutionSession &ES;
std::set<SymbolStringPtr> ResolvedStrings;
SymbolResolver &R;
MaterializationResponsibility *MR;
};
/// Use the given legacy-style FindSymbol function (i.e. a function that
/// takes a const std::string& or StringRef and returns a JITSymbol) to
/// find the flags for each symbol in Symbols and store their flags in
/// SymbolFlags. If any JITSymbol returned by FindSymbol is in an error
/// state the function returns immediately with that error, otherwise it
/// returns the set of symbols not found.
///
/// Useful for implementing lookupFlags bodies that query legacy resolvers.
template <typename FindSymbolFn>
Expected<SymbolFlagsMap> lookupFlagsWithLegacyFn(const SymbolNameSet &Symbols,
FindSymbolFn FindSymbol) {
SymbolFlagsMap SymbolFlags;
for (auto &S : Symbols) {
if (JITSymbol Sym = FindSymbol(*S))
SymbolFlags[S] = Sym.getFlags();
else if (auto Err = Sym.takeError())
return std::move(Err);
}
return SymbolFlags;
}
/// Use the given legacy-style FindSymbol function (i.e. a function that
/// takes a const std::string& or StringRef and returns a JITSymbol) to
/// find the address and flags for each symbol in Symbols and store the
/// result in Query. If any JITSymbol returned by FindSymbol is in an
/// error then Query.notifyFailed(...) is called with that error and the
/// function returns immediately. On success, returns the set of symbols
/// not found.
///
/// Useful for implementing lookup bodies that query legacy resolvers.
template <typename FindSymbolFn>
SymbolNameSet
lookupWithLegacyFn(ExecutionSession &ES, AsynchronousSymbolQuery &Query,
const SymbolNameSet &Symbols, FindSymbolFn FindSymbol) {
SymbolNameSet SymbolsNotFound;
bool NewSymbolsResolved = false;
for (auto &S : Symbols) {
if (JITSymbol Sym = FindSymbol(*S)) {
if (auto Addr = Sym.getAddress()) {
Query.resolve(S, JITEvaluatedSymbol(*Addr, Sym.getFlags()));
Query.notifySymbolReady();
NewSymbolsResolved = true;
} else {
ES.legacyFailQuery(Query, Addr.takeError());
return SymbolNameSet();
}
} else if (auto Err = Sym.takeError()) {
ES.legacyFailQuery(Query, std::move(Err));
return SymbolNameSet();
} else
SymbolsNotFound.insert(S);
}
if (NewSymbolsResolved && Query.isFullyResolved())
Query.handleFullyResolved();
if (NewSymbolsResolved && Query.isFullyReady())
Query.handleFullyReady();
return SymbolsNotFound;
}
/// An ORC SymbolResolver implementation that uses a legacy
/// findSymbol-like function to perform lookup;
template <typename LegacyLookupFn>
class LegacyLookupFnResolver final : public SymbolResolver {
public:
using ErrorReporter = std::function<void(Error)>;
LegacyLookupFnResolver(ExecutionSession &ES, LegacyLookupFn LegacyLookup,
ErrorReporter ReportError)
: ES(ES), LegacyLookup(std::move(LegacyLookup)),
ReportError(std::move(ReportError)) {}
SymbolFlagsMap lookupFlags(const SymbolNameSet &Symbols) final {
if (auto SymbolFlags = lookupFlagsWithLegacyFn(Symbols, LegacyLookup))
return std::move(*SymbolFlags);
else {
ReportError(SymbolFlags.takeError());
return SymbolFlagsMap();
}
}
SymbolNameSet lookup(std::shared_ptr<AsynchronousSymbolQuery> Query,
SymbolNameSet Symbols) final {
return lookupWithLegacyFn(ES, *Query, Symbols, LegacyLookup);
}
private:
ExecutionSession &ES;
LegacyLookupFn LegacyLookup;
ErrorReporter ReportError;
};
template <typename LegacyLookupFn>
std::shared_ptr<LegacyLookupFnResolver<LegacyLookupFn>>
createLegacyLookupResolver(ExecutionSession &ES, LegacyLookupFn LegacyLookup,
std::function<void(Error)> ErrorReporter) {
return std::make_shared<LegacyLookupFnResolver<LegacyLookupFn>>(
ES, std::move(LegacyLookup), std::move(ErrorReporter));
}
} // End namespace orc
} // End namespace llvm
#endif // LLVM_EXECUTIONENGINE_ORC_LEGACY_H
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