If the original code uses the other choice, the original code simply cannot be reproduced at any given point in time. For example, an x86 assembler takes an arbitrary choice between two binary codes for something as simple as MOV AX, BX.
This poses demands on the expressivity of the assembler. Writing a disassembler which produces code which, when assembled, produces exactly the original binary is possible however, there are often differences. For example, IDA allows the human user to make up mnemonic symbols for values or regions of code in an interactive session: human insight applied to the disassembly process often parallels human creativity in the code writing process.
Some disassemblers make use of the symbolic debugging information present in object files such as ELF. Some disassemblers provide a built-in code commenting feature where the generated output gets enriched with comments regarding called API functions or parameters of called functions. If so, a disassembler operating on the machine code would produce disassembly lacking these constants and comments the disassembled output becomes more difficult for a human to interpret than the original annotated source code. These are usually removed from the assembled machine code by the assembler.
Hopper disassembler alternatives software#
Common uses of disassemblers include recovering source code of a program whose original source was lost, malware analysis, modifying software (such as ROM hacking), and software cracking.Ī disassembler differs from a decompiler, which targets a high-level language rather than an assembly language.Īssembly language source code generally permits the use of constants and programmer comments. Disassembly, the output of a disassembler, is often formatted for human-readability rather than suitability for input to an assembler, making it principally a reverse-engineering tool. ( December 2009) ( Learn how and when to remove this template message)Ī disassembler is a computer program that translates machine language into assembly language-the inverse operation to that of an assembler. Please help to improve this article by introducing more precise citations. This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations.
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