/* Plan 9 cmd/6c/gc.h shape, trimmed. */
#ifndef SIX_GC_H
#define SIX_GC_H

#include "ww.h"
#include "6.out.h"

typedef struct Prog Prog;
typedef struct Adr  Adr;

/* one operand: register, immediate, indirect, or symbolic. */
struct Adr {
	int	type;		/* D_AX, D_CONST, D_INDIR, ... */
	int	reg;		/* base register for D_INDIR */
	long long offset;	/* immediate value or memory displacement */
	const char *sym;	/* symbol name for D_EXTERN/D_BRANCH */
};

struct Prog {
	int	as;		/* opcode (A_MOVQ, ...) */
	Adr	from;		/* source operand */
	Adr	to;		/* destination operand (Plan 9 order) */
	int	line;
	const char *label;	/* if non-NULL, this prog is preceded by label: */
	Prog	*link;
};

/* per-fn codegen state */
typedef struct Cg Cg;
struct Cg {
	Arena	*a;
	Prog	*head, *tail;
	const char *fnname;
	const char *cur_mod;	/* current fn's `// MODULE: foo` directive,
				 * NULL when the fn lives in the primary
				 * file (no MODULE: stamp). Drives bare-IDENT
				 * call mangling — `frob()` from within
				 * lib/foo binds to `foo.frob` regardless
				 * of which other modules also export `frob`.
				 * Set by cgfn before walking the body. */
	int	cur_source;	/* lexical source-file scope of the current
				 * declaration; selects its own import bindings. */
	int	framesize;	/* bytes of locals; 16-byte aligned */
	int	curoff;		/* current top of locals */
	Scope	*locals;	/* (name → offset) tracked via Sym */
	int	labelseq;
	int	sep_mode;	/* #22 M3 `-c`: separate-compile / primary-only
				 * codegen. Emit code+DATA ONLY for this
				 * package's own (imported==0) decls; treat every
				 * `.wwi`-sourced (imported==1) dep decl as an
				 * external — body-less fns already skip, value
				 * globals/defs are gated so they don't duplicate
				 * the dep's real definition (link collision).
				 * Off on the combined path (every existing
				 * invocation) so M3 is a pure addition. */
	int	sep_isdep;	/* #99: this unit is a sep DEPENDENCY, not the
				 * root/link-entry unit. The compiler's explicit
				 * --entry flag clears this independently of -I:
				 * every package action may emit export data. Gates
				 * the bare-`main` carve-out: a dep's `fn main` must
				 * mangle on its path like any decl; only the root
				 * entry stays bare. */
};

/* cgen.c */
void	cg_init(Cg*, Arena*);
void	cg_file(Cg*, FILE *out, Node *file);
Prog	*newprog(Cg*, int op);
void	emit(Cg*, Prog*);

/* txt.c */
void	txt_emit(FILE*, Prog *head);

/* wwi.c — non-zero return: check_exported_type rejected a dangling export. */
int	wwi_emit(Checker *c, FILE *of, Node *file);

#endif