GCP - Next-Gen C/C++ compiler!

GCP and G-- form a self-hosting C11 and C++17 source-to-source anti-optimizing compiler collection built on the embedded Tree-sitter parser runtime and GCC / G++ backends:

• GCP (Greenhouse Code Producer): C compiler driver (mirrors GCC, CC=gcp).
• G-- (Green--): C++ compiler driver (mirrors G++, CXX=g--).

Instead of simple standard optimization passes (-O1, -O2, -O3), GCP simulates a BETTER closed stoichiometric reaction chamber conserving C, H, O, and N atoms and maps equilibrium reaction products to idiomatic C and C++ optimization or anti-optimization passes~

Thanks to tree-sitter for the praser.

This project was inspired by《孩子NOI现场被卡脖子，红黑树忘记浇水枯死，对手开挂抢走O2氧气，这位金牌教练说这才是真正的信竞大逃杀》, thanks!

# Windows (MinGW-w64)
cmake -B build -G "MinGW Makefiles" -DCMAKE_BUILD_TYPE=Release
cmake --build build -j

# Windows (Ninja / Visual Studio) or Linux / macOS
cmake -B build -DCMAKE_BUILD_TYPE=Release
cmake --build build --config Release -j

• Vacuum Default -O0: The chamber defaults to vacuum (0 mol at 298 K). Passing -O0 adds zero reactants and performs zero code modifications.
• Stoichiometric Notation: Both prefix coefficients (-6CO2 -6H2O) and explicit molar values (-CO2=6 -H2O=6) are supported.
• Oxygen Supply via Optimization Flags:
  • -O0 -> 0.0 mol O2
  • -O1 -> 0.5 mol O2
  • -O2 -> 1.0 mol O2
  • -O3 -> 1.0 mol O3 (ozone decomposition 2 O3 -> 3 O2)
  • -Ofast -> 5.0 mol O2 + thermal ignition (1150 K)
• Chemical Reactions:
  1. Photochemical Photosynthesis (-fsunlight): 6 CO2 + 6 H2O -> C6H12O6 + 6 O2 (clears greenhouse gases and forwards compilation directly to -O3).
  2. Ozone & High-Voltage Arc (-farc / -flightning): 2 O3 -> 3 O2; thermal nitrogen fixation N2 + O2 -> 2 NO (T >= 2000 K), followed by spontaneous oxidation 2 NO + O2 -> 2 NO2. Without sufficient heat or an arc, N2 remains inert.
  3. Hydrogen Combustion: 2 H2 + O2 -> 2 H2O (dH = -572 kJ).
  4. Methane Combustion: CH4 + 2 O2 -> CO2 + 2 H2O (complete) or 2 CH4 + 3 O2 -> 2 CO + 4 H2O (oxygen-starved).
  5. Carbon Oxidation: C + O2 -> CO2 (excess oxygen), 2 C + O2 -> 2 CO (partial oxidation), and 2 CO + O2 -> 2 CO2.
  6. High-Temperature Endothermic Gasification (-fheat, T >= 973 K): C + CO2 -> 2 CO (Boudouard reaction) and C + H2O -> CO + H2 (steam-carbon syngas reaction).
  7. Water-Gas Shift (623 K <= T < 973 K) & Carbonic Acid Hydration: CO + H2O -> CO2 + H2; CO2 + H2O <-> H2CO3 (activates both -H2O and -CO2).

• --report - Simulate the reaction chamber and print stoichiometry without compiling
• --convert - Emit transformed *.carbon.c / *.carbon.cpp next to source files
• --retain - Retain generated carbonized source files after compilation
• -V, --verbose - Display balanced chemical equations, diagnostics, and AST pass stats
• --backend=<path> - Explicitly set underlying compiler binary (default: gcc or g++)
• -v, --version - Display compiler version information
• -h, --help - Display help message

Never use -CO2=6 -H2O=6 -fsunlight in daily coding. Please always use -C -CO -CO2 -H2O -CH4 -NO2 to get more kawaii Carbon.

You might want to compile GCP and G-- themselves with CC=gcp CXX=g-- and -C -CO -CO2 -H2O -CH4 -NO2 to get a BETTER compiler.