Toy3 Compiler — Handcrafted from tokens to C

A handcrafted compiler for the Toy3 language — built with care and zero magic.
Handwritten lexer, JavaCUP-driven parser with a hand-crafted grammar, manual semantic analysis, and a custom C code generator (strings, dynamic allocation, functions, calling conventions — everything hand-managed). Ready to generate readable C that you compile with gcc.

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Quick summary

• Handwritten lexer for precise token control
• JavaCUP parser using a custom grammar (manually designed)
• Manual semantic analyzer: symbol table, scoping, type checking
• Handcrafted C code generator: dynamic memory, string handling, functions, locals, control flow
• Target: readable .c output → compile with gcc

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Features

• Full pipeline up to semantic analysis and code generation
• Explicit AST representation and deterministic translation strategy
• Memory model mapping Toy3 strings & allocations to C (malloc/free semantics)
• Function calling, parameter passing, and return value handling
• Clear, debuggable C output — ideal for verification and teaching

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Tech stack

• Implementation language: Java
• Parser generator: JavaCUP (grammar hand-authored)
• Target language: C (compiled with gcc)
• Build: plain javac + java for the compiler; gcc for generated C

Author

GioDVK: Head Developper