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89 lines
2.9 KiB
C++
89 lines
2.9 KiB
C++
//===-- llvm/ModuleProvider.h - Interface for module providers --*- 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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// This file provides an abstract interface for loading a module from some
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// place. This interface allows incremental or random access loading of
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// functions from the file. This is useful for applications like JIT compilers
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// or interprocedural optimizers that do not need the entire program in memory
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// at the same time.
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//
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//===----------------------------------------------------------------------===//
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#ifndef MODULEPROVIDER_H
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#define MODULEPROVIDER_H
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#include <string>
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namespace llvm {
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class Function;
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class Module;
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class ModuleProvider {
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protected:
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Module *TheModule;
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ModuleProvider();
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public:
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virtual ~ModuleProvider();
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/// getModule - returns the module this provider is encapsulating.
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///
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Module* getModule() { return TheModule; }
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/// materializeFunction - make sure the given function is fully read. If the
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/// module is corrupt, this returns true and fills in the optional string
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/// with information about the problem. If successful, this returns false.
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///
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virtual bool materializeFunction(Function *F, std::string *ErrInfo = 0) = 0;
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/// dematerializeFunction - If the given function is read in, and if the
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/// module provider supports it, release the memory for the function, and set
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/// it up to be materialized lazily. If the provider doesn't support this
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/// capability, this method is a noop.
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///
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virtual void dematerializeFunction(Function *) {}
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/// materializeModule - make sure the entire Module has been completely read.
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/// On error, return null and fill in the error string if specified.
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///
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virtual Module* materializeModule(std::string *ErrInfo = 0) = 0;
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/// releaseModule - no longer delete the Module* when provider is destroyed.
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/// On error, return null and fill in the error string if specified.
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///
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virtual Module* releaseModule(std::string *ErrInfo = 0) {
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// Since we're losing control of this Module, we must hand it back complete
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if (!materializeModule(ErrInfo))
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return 0;
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Module *tempM = TheModule;
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TheModule = 0;
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return tempM;
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}
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};
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/// ExistingModuleProvider - Allow conversion from a fully materialized Module
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/// into a ModuleProvider, allowing code that expects a ModuleProvider to work
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/// if we just have a Module. Note that the ModuleProvider takes ownership of
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/// the Module specified.
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struct ExistingModuleProvider : public ModuleProvider {
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explicit ExistingModuleProvider(Module *M) {
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TheModule = M;
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}
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bool materializeFunction(Function *, std::string * = 0) {
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return false;
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}
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Module* materializeModule(std::string * = 0) { return TheModule; }
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};
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} // End llvm namespace
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#endif
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