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https://github.com/c64scene-ar/llvm-6502.git
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c41ab789a0
Start teaching the runtime Dyld interface to use the memory manager API for allocating space. Rather than mapping directly into the MachO object, we extract the payload for each object and copy it into a dedicated buffer allocated via the memory manager. For now, just do Segment64, so this works on x86_64, but not yet on ARM. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128973 91177308-0d34-0410-b5e6-96231b3b80d8
72 lines
2.4 KiB
C++
72 lines
2.4 KiB
C++
//===-- RuntimeDyld.h - Run-time dynamic linker for MC-JIT ------*- 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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// Interface for the runtime dynamic linker facilities of the MC-JIT.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_RUNTIME_DYLD_H
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#define LLVM_RUNTIME_DYLD_H
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#include "llvm/ADT/StringRef.h"
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#include "llvm/Support/Memory.h"
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namespace llvm {
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class RuntimeDyldImpl;
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class MemoryBuffer;
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// RuntimeDyld clients often want to handle the memory management of
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// what gets placed where. For JIT clients, this is an abstraction layer
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// over the JITMemoryManager, which references objects by their source
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// representations in LLVM IR.
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// FIXME: As the RuntimeDyld fills out, additional routines will be needed
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// for the varying types of objects to be allocated.
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class RTDyldMemoryManager {
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RTDyldMemoryManager(const RTDyldMemoryManager&); // DO NOT IMPLEMENT
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void operator=(const RTDyldMemoryManager&); // DO NOT IMPLEMENT
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public:
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RTDyldMemoryManager() {}
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virtual ~RTDyldMemoryManager();
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// Allocate ActualSize bytes, or more, for the named function. Return
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// a pointer to the allocated memory and update Size to reflect how much
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// memory was acutally allocated.
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virtual uint8_t *startFunctionBody(const char *Name, uintptr_t &Size) = 0;
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// Mark the end of the function, including how much of the allocated
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// memory was actually used.
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virtual void endFunctionBody(const char *Name, uint8_t *FunctionStart,
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uint8_t *FunctionEnd) = 0;
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};
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class RuntimeDyld {
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RuntimeDyld(const RuntimeDyld &); // DO NOT IMPLEMENT
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void operator=(const RuntimeDyld &); // DO NOT IMPLEMENT
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// RuntimeDyldImpl is the actual class. RuntimeDyld is just the public
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// interface.
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RuntimeDyldImpl *Dyld;
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public:
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RuntimeDyld(RTDyldMemoryManager*);
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~RuntimeDyld();
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bool loadObject(MemoryBuffer *InputBuffer);
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uint64_t getSymbolAddress(StringRef Name);
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void reassignSymbolAddress(StringRef Name, uint64_t Addr);
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// FIXME: Should be parameterized to get the memory block associated with
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// a particular loaded object.
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sys::MemoryBlock getMemoryBlock();
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StringRef getErrorString();
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};
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} // end namespace llvm
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#endif
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