PBXB64 V23 language reference

C supported commands and scope

Native Windows x64 C89–C2y modes, preprocessing, LLP64/MSVC layout, selected GCC/MSVC extensions, builtins, Windows ABI, inline assembly, SEH, TLS, constructors/sections, DLLs and debug output. This is a bounded reference frontend, not full ISO/GCC/MSVC conformance; headers/runtime exports are separate from C language commands.

Status: bounded. Source basis: PBXB64/docs/C_FRONTEND_REFERENCE.md and the C frontend/runtime/header source surface.

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Language core / Sprachkern

Name	Syntax / form	Scope	Boundary
types	`void, _Bool/bool, char, integer, float, double, long double, struct, union, enum`	C scalar, aggregate and pointer types.	long double is 64-bit in the documented PBXB64 C surface.
declarations	`declaration; typedef; _Atomic; _Alignas`	Declarations, storage, qualifiers and type aliases.	Some C2y/extension forms are selected rather than universal.
control	`if/else, switch, for, while, do, goto, break, continue, return`	C control flow.	Source-/syntax-backed subset; no whole-language or aggregate qualification claim.
functions	`return_type f(params)`	Functions, prototypes, variadics and function pointers.	Win64 ABI and selected calling conventions apply.

Preprocessor and extensions / Präprozessor und Erweiterungen

Name	Syntax / form	Scope	Boundary
preprocessor	`#include #define #if #ifdef #ifndef #elif #else #endif #pragma #embed`	Preprocessing and selected C23/C2y directives.	Include search and macro behavior follow the shipped headers/runtime contract.
attributes	`[[...]] / __attribute__ / __declspec`	Selected attributes and declspecs.	Unsupported attributes remain diagnostics.
inline assembly	`__asm / asm`	Selected x64 inline assembly forms.	Assembler dialect/options are separate from C semantics.

ABI, runtime and libraries / ABI, Runtime und Bibliotheken

Name	Syntax / form	Scope	Boundary
Windows ABI	`__stdcall / __cdecl / __vectorcall`	Windows calling conventions and PE32+ linkage.	Source-/syntax-backed subset; no whole-language or aggregate qualification claim.
builtins / intrinsics	`__builtin_* / _mm_* / __read...`	Selected compiler builtins, MSVC intrinsics and vector types.	These are provided functions/headers, not PBXB64 BASIC commands.
headers	`stdio.h, stdint.h, math.h, windows.h, ...`	Shipped C headers and runtime declarations.	Header availability does not imply full library ABI coverage.