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Assembler

As explained in Modern C

Assembler is a machine-specific programming language consisting of symbolic representations of processor instructions.

Assembler is a machine-specific language that represents processor instructions operating on hardware registers and memory locations. Unlike C, it has dialects shaped by the CPU, compiler, and operating system. section 13.5

A typical assembler printout combines several visible elements:

  • Instructions such as movl store or move values between registers and memory; movl $0, -16(%rbp) stores zero at a stack-relative memory location. section 13.5
  • Labels identify program points: fgoto marks a function entry, while .L_AGAIN corresponds to a C goto label. section 13.5
  • Comments after # connect individual assembler instructions with their C counterparts. section 13.5

How Modern C covers it

How deep it goes
Defines assembler and interprets representative instructions, registers, labels, and comments without developing a complete language specification.
Examples
Uses x86_64 listings for fgoto, including unoptimized and optimized assembler versions with registers, stack locations, labels, and jumps.
What you can do after
Evaluate assembler printouts by identifying instructions, registers, memory locations, labels, comments, and their corresponding C operations.
How it connects
Connects assembler with the von Neumann model, processor architecture, hardware registers, main memory, C, compilers, and operating systems.
Cover of Modern C
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This explainer was generated by Manning's knowledge graph from the text of Modern C. The section links point to the parts of the book it draws on.