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In computing, an executable file or executable program, or sometimes simply an executable, causes a computer "to perform indicated tasks according to encoded instructions," as opposed to a data file that must be parsed by a program to be meaningful. These ''instructions'' are traditionally machine code instructions for a physical CPU. However, in a more general sense, a file containing instructions (such as bytecode) for a ''software'' interpreter may also be considered executable; even a scripting language source file may therefore be considered executable in this sense. The exact interpretation depends upon the use; while the term often refers only to machine code files, in the context of protection against computer viruses all files which cause potentially hazardous instruction execution, including scripts, are lumped together for convenience. Executable code is used to describe sequences of executable instructions that do not necessarily constitute an executable file; for example, sections within a program. ==Generation of executable files== While an executable file can be hand-coded in machine language, it is far more usual to develop software as source code in a high-level language easily understood by humans, or in some cases an assembly language more complex for humans but more closely associated with machine code instructions. The high-level language is compiled into either an executable machine code file or a non-executable machine-code object file of some sort; the equivalent process on assembly language source code is called ''assembly''. Several object files are linked to create the executable. Object files, executable or not, are typically in a container format, such as Executable and Linkable Format (ELF). This structures the generated machine code, for example dividing it into sections such as the .text (executable code), .data (static variables), and .rodata (static constants). In order to be executed by the system (such as an operating system, firmware, or boot loader), an executable file must conform to the system's Application Binary Interface (ABI). Most simply a file is executed by loading the file into memory and simply jumping to the start of the address space and executing from there, but in more complicated interfaces executable files have additional metadata, specifying a separate entry point. For example, in ELF, the entry point is specified in the header in the e_entry field, which specifies the (virtual) memory address at which to start execution. In the GNU Compiler Collection this field is set by the linker based on the _start symbol.Executable files typically also include a runtime system, which implements runtime language features (such as task scheduling, exception handling, calling static constructors and destructors, etc.) and interactions with the operating system, notably passing arguments, environment, and returning an exit status, together with other startup and shutdown features such as releasing resources such as file handles. For C, this is done by linking in the crt0 object, which contains the actual entry point and does setup and shutdown by calling the runtime library. Executable files thus normally contain significant additional machine code beyond that directly generated from the specific source code. In some cases it is desirable to omit this, for example for embedded systems development or simply to understand how compilation, linking, and loading work. In C this can be done by omitting the usual runtime, and instead explicitly specifying a linker script, which generates the entry point and handles startup and shutdown, such as calling main to start and returning exit status to kernel at end.〔(【引用サイトリンク】title=Hello from a libc-free world! (Part 1) )〕The same source code can in general be compiled to run under different computer architectures and operating systems. Sometimes this requires no changes to the source code, and simply outputting different machine code (targeting a different instruction set) and linking to a different runtime (due to operating system differences). In other cases this requires changing the source code, either including compile-time changes (conditional compilation) or run-time changes (checking the environment at run time). Conversion of existing source code for a different platform is called ''porting''. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Executable」の詳細全文を読む スポンサード リンク
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