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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77240 91177308-0d34-0410-b5e6-96231b3b80d8
81 lines
2.9 KiB
C++
81 lines
2.9 KiB
C++
//===- MemoryObject.h - Abstract memory interface ---------------*- 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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#ifndef MEMORYOBJECT_H
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#define MEMORYOBJECT_H
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#include "llvm/Support/DataTypes.h"
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namespace llvm {
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/// MemoryObject - Abstract base class for contiguous addressable memory.
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/// Necessary for cases in which the memory is in another process, in a
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/// file, or on a remote machine.
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class MemoryObject {
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public:
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/// Destructor - Override as necessary.
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virtual ~MemoryObject() {
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}
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/// getBase - Returns the lowest valid address in the region.
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///
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/// @result - The lowest valid address.
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virtual uintptr_t getBase() const = 0;
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/// getExtent - Returns the size of the region in bytes. (The region is
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/// contiguous, so the highest valid address of the region
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/// is getBase() + getExtent() - 1).
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///
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/// @result - The size of the region.
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virtual uintptr_t getExtent() const = 0;
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/// readByte - Tries to read a single byte from the region.
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///
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/// @param address - The address of the byte, in the same space as getBase().
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/// @param ptr - A pointer to a byte to be filled in. Must be non-NULL.
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/// @result - 0 if successful; -1 if not. Failure may be due to a
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/// bounds violation or an implementation-specific error.
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virtual int readByte(uintptr_t address, uint8_t* ptr) const = 0;
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/// readByte - Tries to read a contiguous range of bytes from the
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/// region, up to the end of the region.
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/// You should override this function if there is a quicker
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/// way than going back and forth with individual bytes.
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///
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/// @param address - The address of the first byte, in the same space as
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/// getBase().
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/// @param size - The maximum number of bytes to copy.
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/// @param buf - A pointer to a buffer to be filled in. Must be non-NULL
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/// and large enough to hold size bytes.
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/// @result - The number of bytes copied if successful; (uintptr_t)-1
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/// if not.
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/// Failure may be due to a bounds violation or an
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/// implementation-specific error.
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virtual uintptr_t readBytes(uintptr_t address,
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uintptr_t size,
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uint8_t* buf) const {
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uintptr_t current = address;
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uintptr_t limit = getBase() + getExtent();
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while(current - address < size && current < limit) {
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if(readByte(current, &buf[(current - address)]))
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return (uintptr_t)-1;
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current++;
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}
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return current - address;
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}
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};
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}
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#endif
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