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    <p>If you know assembly and how things work at the OS-level, you are conforming to a certain ABI. The ABI govern things like how parameters are passed, where return values are placed. For many platforms there is only one ABI to choose from, and in those cases the ABI is just "how things work". </p> <p>However, the ABI also govern things like how classes/objects are laid out in C++. This is necessary if you want to be able to pass object references across module boundaries or if you want to mix code compiled with different compilers.</p> <p>Also, if you have an 64-bit OS which can execute 32-bit binaries, you will have different ABIs for 32- and 64-bit code.</p> <p>In general, any code you link into the same executable must conform to the same ABI. If you want to communicate between code using different ABIs, you must use some form of RPC or serialization protocols.</p> <p>I think you are trying too hard to squeeze in different types of interfaces into a fixed set of characteristics. For example, an interface doesn't necessarily have to be split into consumers and producers. An interface is just a convention by which two entities interact.</p> <p>ABIs can be (partially) ISA-agnostic. Some aspects (such as calling conventions) depend on the ISA, while other aspects (such as C++ class layout) do not.</p> <p>A well defined ABI is very important for people writing compilers. Without a well defined ABI, it would be impossible to generate interoperable code.</p> <p>EDIT: Some notes to clarify:</p> <ul> <li>"Binary" in ABI does not exclude the use of strings or text. If you want to link a DLL exporting a C++ class, somewhere in it the methods and type signatures must be encoded. That's where C++ name-mangling comes in.</li> <li>The reason why you never provided an ABI is that the vast majority of programmers will never do it. ABIs are provided by the same people designing the platform (i.e. operating system), and very few programmers will ever have the privilege to design a widely-used ABI.</li> </ul>
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    1. POWhat is an application binary interface (ABI)?
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    1. COI'm not at all convinced that my template is faulty. Because every where this template for interface is holding true. So, yes I want I expect ABI also to fit into this template but thats not it. IMPORTANT thing is I still don't understand. I don't know if I'm so dumb or something else but it just not getting into my head. I'm unable to realize the answers and the wiki article.
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