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This patch replaces RuntimeDyld::SymbolInfo with JITSymbol: A symbol class that is capable of lazy materialization (i.e. the symbol definition needn't be emitted until the address is requested). This can be used to support common and weak symbols in the JIT (though this is not implemented in this patch). For consistency, RuntimeDyld::SymbolResolver is renamed to JITSymbolResolver. For space efficiency a new class, JITEvaluatedSymbol, is introduced that behaves like the old RuntimeDyld::SymbolInfo - i.e. it is just a pair of an address and symbol flags. Instances of JITEvaluatedSymbol can be used in symbol-tables to avoid paying the space cost of the materializer. llvm-svn: 277386
105 lines
4.1 KiB
C++
105 lines
4.1 KiB
C++
//===- ObjectTransformLayer.h - Run all objects through functor -*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// Run all objects passed in through a user supplied functor.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_EXECUTIONENGINE_ORC_OBJECTTRANSFORMLAYER_H
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#define LLVM_EXECUTIONENGINE_ORC_OBJECTTRANSFORMLAYER_H
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#include "llvm/ExecutionEngine/JITSymbol.h"
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namespace llvm {
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namespace orc {
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/// @brief Object mutating layer.
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///
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/// This layer accepts sets of ObjectFiles (via addObjectSet). It
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/// immediately applies the user supplied functor to each object, then adds
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/// the set of transformed objects to the layer below.
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template <typename BaseLayerT, typename TransformFtor>
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class ObjectTransformLayer {
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public:
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/// @brief Handle to a set of added objects.
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typedef typename BaseLayerT::ObjSetHandleT ObjSetHandleT;
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/// @brief Construct an ObjectTransformLayer with the given BaseLayer
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ObjectTransformLayer(BaseLayerT &BaseLayer,
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TransformFtor Transform = TransformFtor())
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: BaseLayer(BaseLayer), Transform(std::move(Transform)) {}
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/// @brief Apply the transform functor to each object in the object set, then
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/// add the resulting set of objects to the base layer, along with the
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/// memory manager and symbol resolver.
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///
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/// @return A handle for the added objects.
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template <typename ObjSetT, typename MemoryManagerPtrT,
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typename SymbolResolverPtrT>
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ObjSetHandleT addObjectSet(ObjSetT Objects, MemoryManagerPtrT MemMgr,
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SymbolResolverPtrT Resolver) {
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for (auto I = Objects.begin(), E = Objects.end(); I != E; ++I)
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*I = Transform(std::move(*I));
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return BaseLayer.addObjectSet(std::move(Objects), std::move(MemMgr),
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std::move(Resolver));
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}
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/// @brief Remove the object set associated with the handle H.
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void removeObjectSet(ObjSetHandleT H) { BaseLayer.removeObjectSet(H); }
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/// @brief Search for the given named symbol.
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/// @param Name The name of the symbol to search for.
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/// @param ExportedSymbolsOnly If true, search only for exported symbols.
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/// @return A handle for the given named symbol, if it exists.
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JITSymbol findSymbol(const std::string &Name, bool ExportedSymbolsOnly) {
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return BaseLayer.findSymbol(Name, ExportedSymbolsOnly);
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}
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/// @brief Get the address of the given symbol in the context of the set of
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/// objects represented by the handle H. This call is forwarded to the
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/// base layer's implementation.
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/// @param H The handle for the object set to search in.
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/// @param Name The name of the symbol to search for.
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/// @param ExportedSymbolsOnly If true, search only for exported symbols.
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/// @return A handle for the given named symbol, if it is found in the
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/// given object set.
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JITSymbol findSymbolIn(ObjSetHandleT H, const std::string &Name,
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bool ExportedSymbolsOnly) {
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return BaseLayer.findSymbolIn(H, Name, ExportedSymbolsOnly);
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}
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/// @brief Immediately emit and finalize the object set represented by the
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/// given handle.
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/// @param H Handle for object set to emit/finalize.
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void emitAndFinalize(ObjSetHandleT H) { BaseLayer.emitAndFinalize(H); }
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/// @brief Map section addresses for the objects associated with the handle H.
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void mapSectionAddress(ObjSetHandleT H, const void *LocalAddress,
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JITTargetAddress TargetAddr) {
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BaseLayer.mapSectionAddress(H, LocalAddress, TargetAddr);
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}
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/// @brief Access the transform functor directly.
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TransformFtor &getTransform() { return Transform; }
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/// @brief Access the mumate functor directly.
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const TransformFtor &getTransform() const { return Transform; }
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private:
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BaseLayerT &BaseLayer;
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TransformFtor Transform;
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};
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} // End namespace orc.
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} // End namespace llvm.
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#endif // LLVM_EXECUTIONENGINE_ORC_OBJECTTRANSFORMLAYER_H
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