http://ctoassembly.com

C to Assembly is an online compiler of micro-C code (a subset of C large enough for demonstration) and interpreter of hypothetical Assembly (micro-C is compiled to hypothetical Assembly which looks a lot like x86 asm).

See docs here:

• micro-C
• hypothetical Assembly

• src/main/java/com/ctoassembly/compiler - Java compiler (micro-C to hypothetical-asm)
  • Yeah, yeah, yeah, I am not joking - Java is compiling c to asm.
  • mycc.lex - scanner written in Backus-Naur form.
  • mycc.cup - LR parser that defines the grammar. All the code generation is executed from here (when a rule is matched), so it's a good starting point for reading code.
• WebContent - JavaScript/Angular assembly interpreter
  • ccode.html - compiling happens here.
  • js/angular/controller.js - angular controller backing up the ccode.html. It calls the servlet holding the compiler, presents the asm code and interprets (executes) it line by line.
  • js/cpu.js - that's the javascript CPU
  • js/asmmetamodel.js - all asm instructions and their execution strategy is encapsulated here
  • js/ui.js - ui support (drawing and such)
  • js/constants.js - CPU constants
  • js/util.js - util support for everything above
  • js/prototype.js - useful javascript extensions that I used throughout the code

• Enlarge the subset of C that the compiler can compile
• Fix bugs

Apache 2.0

Free Software, Hell Yeah!