Overview

• Outputs grammar/parser.c, grammar/parser.h, and grammar/lexer.c via Flex + Bison.
• Targets C17 baseline, GCC/Clang extensions, and GNU extended inline asm.
• This step only generates sources. No build/link integration is performed here.

Usage

• Run make neo-c at repo root to (re)generate the files.
• Requires flex and bison to be installed and on PATH.

Files

• neo-c.y: Bison grammar (skeleton). Produces parser.c and parser.h.
• neo-c.l: Flex lexer (skeleton). Produces lexer.c.

Notes

• The grammar accepts C17, many GCC/Clang extensions, and inline asm (GNU extended form).
• Preprocessor lines are currently skipped in the lexer; integrate with your pipeline/cpp as desired.

Examples

• Simple asm

  • asm("nop");
  • asm volatile ("wfi");

• Extended asm (outputs/inputs/clobbers)

  • asm volatile ("add %0, %1, %2" : "=r"(out) : "r"(a), "r"(b) : "cc");

• Extended asm with symbolic names

  • asm ("add %[d], %[a], %[b]" : [d]"=r"(dst) : [a]"r"(lhs), [b]"r"(rhs));

• asm goto

  • asm goto ("b %l0" ::: : target); target:;

• Statement expression (GCC)

  • int x = ({ int t = 1; t + 2; });

• Attributes for kernel/embedded

  • __attribute__((naked)) void isr(void) { asm("...\n"); }
  • __attribute__((section(".init"), aligned(4096), used)) static const char k[] = "...";