4.9 KiB
| title | TARGET DECK | FILE TAGS | tags | ||
|---|---|---|---|---|---|
| Object Files | Obsidian::STEM | linker::object-file |
|
Overview
Object files come in three forms:
- Relocatable object files. Contains binary code and data in a form that can be combined with other relocatable object files at compile time.
- Executable object files. Contains binary code and data in a form that can be copied directly into memory and executed.
- Shared object files. A special type of relocatable object file that can be loaded into memory and linked dynamically, at either load time or run time.
%%ANKI Basic What are the two types of object files? Back: Relocatable and executable. Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.
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%%ANKI Basic Relocatable object files are outputs of which compiler driver component? Back: The assembler. Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016. Tags: c17
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%%ANKI Basic Executable object files are outputs of which compiler driver component? Back: The linker. Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016. Tags: c17
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%%ANKI Basic Relocatable object files are inputs into which compiler driver component? Back: The linker. Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016. Tags: c17
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%%ANKI Basic Executable object files are inputs into which compiler driver component? Back: N/A. Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016. Tags: c17
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%%ANKI Cloze A {shared} object file is a special case of a {relocatable} object file. Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.
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An object module is a sequence of bytes whereas an object file is an object module stored on disk.
%%ANKI Basic What is an object module? Back: A sequence of bytes. Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.
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%%ANKI Basic In terms of object modules, what is an object file? Back: An object module stored on disk. Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.
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%%ANKI Basic What distinguishes an object module from an object file? Back: An object file is an object module stored on disk. Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.
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%%ANKI Basic In what way is the term "object file" misused by Bryant et al.? Back: Technically this term only refers to object modules on disk. Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.
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Object files are organized to specific object file formats:
- Windows uses the PE (Portable Executable) format.
- Mac OS-X uses the Mach-O format.
- Modern x86-64 Linux systems use the ELF (Executable and Linkable Format) format.
%%ANKI Basic What object file format do x86-64 Linux machines typically use? Back: ELF. Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016. Tags: x86-64
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%%ANKI Basic What is the ELF object file format an acronym for? Back: Executable and Linkable Format. Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016. Tags: x86-64
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%%ANKI Basic What is ELF an example of? Back: An object file format. Reference: Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016. Tags: x86-64
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Bibliography
- Bryant, Randal E., and David O'Hallaron. Computer Systems: A Programmer's Perspective. Third edition, Global edition. Always Learning. Pearson, 2016.