RustC

A learning‐by‐doing project
Simplified C compiler implemented in Rust. Rather than supporting all of C, this tool focuses on a well‑defined subset that exercises key compiler components—lexing, parsing, AST construction, semantic checks, code generation.

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Implementation Scope

Supported Subset

• Basic types

  • int (32‑bit signed)
  • char (8‑bit signed)
  • void

• Derived types

  • Single‑level pointers (int*, char*)
  • Fixed‑size one‑dimensional arrays (int a[10])

• Literals

  • Integer literals (decimal)
  • Character literals ('a', '\t', '\0', …)

• Identifiers & Keywords

  • User‑defined names (variables, functions, parameters)
  • Keywords: int, char, if / else, for, while, return, break, continue

• Operators

  • Arithmetic: +, -, *, /, %
  • Comparison: ==, !=, <, >, <=, >=
  • Logical: !, &&, ||
  • Bitwise: &, |, ^
  • Compound assignment: +=, -=
  • Increment / decrement: ++, --
  • Assignment: =

• Control flow

  • Conditional: if / else
  • Loops: for, while
  • Loop control: break, continue

• Comments

  • Single‑line: // …
  • Multi‑line: /* … */

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Excluded C Features

• Preprocessor: #include, #define, etc. are ignored
• Complex types: struct, union, enum
• Function pointers & varargs
• Array initialization (outside declarations), dynamic memory (malloc/free)
• Floating point: float, double
• Storage classes & qualifiers: static, extern, const, volatile
• Preprocessor macros & advanced preprocessing