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# Architecture
`cpsc` compiles CIE A-Level 9618 pseudocode to native executables or LLVM IR (C++17, LLVM 23 / Clang 23).
This file is an index; the detail lives in `AGENTS/ARCH/`.
| File | Contents |
|---|---|
| [OVERVIEW.md](ARCH/OVERVIEW.md) | Three-stage pipeline, fixed value representation (ABI), C interop types, pointer to language manuals |
| [BUILD.md](ARCH/BUILD.md) | Build and run commands, run modes, exception ABI, runtime errors, CI overview |
| [DEPENDENCIES.md](ARCH/DEPENDENCIES.md) | Local/system dependency lookup, compiler selection, MSYS2 notes, LLVM 23 pin |
| [DRIVER.md](ARCH/DRIVER.md) | `tools/driver/main.cc`: options, multi-file inputs, entry points, output and exit-code rules, PATH/NONE modes |
| [EMBEDDED_RUNNER.md](ARCH/EMBEDDED_RUNNER.md) | EMBEDDED LLJIT/JITLink runner, MinGW COFF/SEH support, archive loading |
| [LINKING.md](ARCH/LINKING.md) | Static LLVM/LLD linking, `NativeCompiler`, macOS static LLD helper |
| [INSTALL.md](ARCH/INSTALL.md) | `install.sh`/`install.cmd`, manual generation, release packaging |
| [NIGHTLY.md](ARCH/NIGHTLY.md) | `nightly-build.yml` jobs, Bundle packages, macOS LLD/Rust caching, publish rules, package naming |
| [LAYOUT.md](ARCH/LAYOUT.md) | Source file map (lexer, parser, codegen, CMake, installers), AST conventions |
`#LIB` library units are described in [CONVENTIONS/EXCEPTIONS_AND_UNITS.md](CONVENTIONS/EXCEPTIONS_AND_UNITS.md);
the embedded standard library in [SUBSYSTEMS/STDLIB.md](SUBSYSTEMS/STDLIB.md).
## Detail docs
| File | Read it when |
|---|---|
| [CONVENTIONS.md](CONVENTIONS.md) | Before writing any code — cross-module invariants whose violation breaks code you didn't touch |
| [EXTENDING.md](EXTENDING.md) | Adding a statement, builtin, operator, type, runtime check, or libc dependency — exact recipes |
| [SUBSYSTEMS.md](SUBSYSTEMS.md) | Working on a CodeGen helper subsystem: arrays, functions/operators, EXTERN, user types, classes, runtime checks/exceptions, files, memory, standard library, templates |
| [PITFALLS.md](PITFALLS.md) | Verified sharp edges (they *will* bite) and the list of unimplemented 9618 features |
| [MAN.md](MAN.md) | Editing man Markdown, language manual layout, generation and installation |
| [TESTING.md](TESTING.md) | Writing or running compiler tests in `tests/` (case layout, manifests, Perl runner, generators) |
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