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In the current implementation, GCStrategy is a part of the ownership structure for the gc metadata which describes a Module. It also contains a reference to the module in question. As a result, GCStrategy instances are essentially Module specific. I plan to transition away from this design. Instead, a GCStrategy will be owned by the LLVMContext. It will be a lightweight policy object which contains no information about the Modules or Functions involved, but can be easily reached given a Function. The first step in this transition is to remove the direct Module reference from GCStrategy. This also requires removing the single user of this reference, the GCMetadataPrinter hierarchy. In theory, this will allow the lifetime of the printers to be scoped to the LLVMContext as well, but in practice, I'm not actually changing that. (Yet?) An alternate design would have been to move the direct Module reference into the GCMetadataPrinter and change the keying of the owning maps to explicitly key off both GCStrategy and Module. I'm open to doing it that way instead, but didn't see much value in preserving the per Module association for GCMetadataPrinters. The next change in this sequence will be to start unwinding the intertwined ownership between GCStrategy, GCModuleInfo, and GCFunctionInfo. Differential Revision: http://reviews.llvm.org/D6566 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223859 91177308-0d34-0410-b5e6-96231b3b80d8
73 lines
2.2 KiB
C++
73 lines
2.2 KiB
C++
//===-- llvm/CodeGen/GCMetadataPrinter.h - Prints asm GC tables -*- 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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// The abstract base class GCMetadataPrinter supports writing GC metadata tables
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// as assembly code. This is a separate class from GCStrategy in order to allow
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// users of the LLVM JIT to avoid linking with the AsmWriter.
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//
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// Subclasses of GCMetadataPrinter must be registered using the
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// GCMetadataPrinterRegistry. This is separate from the GCStrategy itself
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// because these subclasses are logically plugins for the AsmWriter.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_GCMETADATAPRINTER_H
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#define LLVM_CODEGEN_GCMETADATAPRINTER_H
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#include "llvm/CodeGen/GCMetadata.h"
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#include "llvm/CodeGen/GCStrategy.h"
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#include "llvm/Support/Registry.h"
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namespace llvm {
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class GCMetadataPrinter;
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/// GCMetadataPrinterRegistry - The GC assembly printer registry uses all the
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/// defaults from Registry.
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typedef Registry<GCMetadataPrinter> GCMetadataPrinterRegistry;
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/// GCMetadataPrinter - Emits GC metadata as assembly code.
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///
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class GCMetadataPrinter {
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public:
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typedef GCStrategy::list_type list_type;
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typedef GCStrategy::iterator iterator;
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private:
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GCStrategy *S;
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friend class AsmPrinter;
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protected:
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// May only be subclassed.
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GCMetadataPrinter();
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private:
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GCMetadataPrinter(const GCMetadataPrinter &) LLVM_DELETED_FUNCTION;
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GCMetadataPrinter &
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operator=(const GCMetadataPrinter &) LLVM_DELETED_FUNCTION;
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public:
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GCStrategy &getStrategy() { return *S; }
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/// begin/end - Iterate over the collected function metadata.
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iterator begin() { return S->begin(); }
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iterator end() { return S->end(); }
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/// beginAssembly/finishAssembly - Emit module metadata as assembly code.
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virtual void beginAssembly(Module &M, AsmPrinter &AP);
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virtual void finishAssembly(Module &M, AsmPrinter &AP);
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virtual ~GCMetadataPrinter();
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};
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}
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#endif
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