/*
 * l.h — 6l-private header. Loads relocatable ELF64 .o files (the
 * format produced by 6a) and links them into a static executable.
 *
 * No archives yet (phase 8). No dynamic linking ever.
 */
#ifndef SIX_L_H
#define SIX_L_H

#include <stddef.h>
#include <stdint.h>
#include <stdio.h>

typedef int8_t   i8;
typedef int16_t  i16;
typedef int32_t  i32;
typedef int64_t  i64;
typedef uint8_t  u8;
typedef uint16_t u16;
typedef uint32_t u32;
typedef uint64_t u64;

typedef struct Lsym  Lsym;
typedef struct Lrel  Lrel;
typedef struct Lobj  Lobj;
typedef struct Lnk   Lnk;

struct Lsym {
	const char *name;
	u64	val;		/* offset within combined .text once linked */
	int	defined;	/* 1 if a Lobj defines this symbol */
	Lobj	*owner;
	int	idx_in_owner;
	Lsym	*next;
};

struct Lrel {
	u64	off;		/* offset within combined .text */
	int	kind;		/* R_X86_64_* */
	Lsym	*sym;
	i64	addend;
	Lrel	*next;
};

struct Lobj {
	const char *path;
	u8	*buf;		/* mmapped or read-in object bytes */
	u64	len;
	u64	text_off;	/* offset of .text in combined output */
	u64	text_size;
	Lobj	*next;
};

struct Lnk {
	Lobj	*objs;
	Lsym	*syms;
	Lrel	*rels;
	u8	*text;		/* combined .text */
	u64	textcap, textlen;
	int	errs;
};

/* obj.c */
int	l_load(Lnk*, const char *path);
/* sym.c */
Lsym	*l_intern(Lnk*, const char *name);
Lsym	*l_lookup(Lnk*, const char *name);
/* pass.c */
int	l_resolve(Lnk*);
int	l_relocate(Lnk*, u64 base);
/* out.c */
int	l_emit_elf(Lnk*, FILE *out, u64 base, u64 entry);

#endif