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https://github.com/c64scene-ar/llvm-6502.git
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020f4e861a
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148264 91177308-0d34-0410-b5e6-96231b3b80d8
95 lines
3.6 KiB
C++
95 lines
3.6 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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/// allocateCodeSection - Allocate a memory block of (at least) the given
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/// size suitable for executable code.
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virtual uint8_t *allocateCodeSection(uintptr_t Size, unsigned Alignment,
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unsigned SectionID) = 0;
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/// allocateDataSection - Allocate a memory block of (at least) the given
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/// size suitable for data.
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virtual uint8_t *allocateDataSection(uintptr_t Size, unsigned Alignment,
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unsigned SectionID) = 0;
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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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RTDyldMemoryManager *MM;
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protected:
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// Change the address associated with a section when resolving relocations.
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// Any relocations already associated with the symbol will be re-resolved.
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void reassignSectionAddress(unsigned SectionID, uint64_t Addr);
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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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// Get the address of our local copy of the symbol. This may or may not
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// be the address used for relocation (clients can copy the data around
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// and resolve relocatons based on where they put it).
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void *getSymbolAddress(StringRef Name);
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// Resolve the relocations for all symbols we currently know about.
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void resolveRelocations();
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/// mapSectionAddress - map a section to its target address space value.
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/// Map the address of a JIT section as returned from the memory manager
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/// to the address in the target process as the running code will see it.
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/// This is the address which will be used for relocation resolution.
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void mapSectionAddress(void *LocalAddress, uint64_t TargetAddress);
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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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