array.h

/*
 * This file is part of libFirm.
 * Copyright (C) 2012 University of Karlsruhe.
 */

#ifndef FIRM_ADT_ARRAY_H
#define FIRM_ADT_ARRAY_H

#include <assert.h>
#include <stddef.h>

#include "obst.h"

#include "../begin.h"

typedef union {
  long double d;
  void       *p;
  long        l;
} aligned_type;

typedef struct {
    int magic;              
    size_t allocated;       
    size_t nelts;           
    aligned_type elts[];    
} ir_arr_descr;

extern ir_arr_descr arr_mt_descr;

FIRM_API void *ir_new_arr_f(size_t nelts, size_t elts_size);

FIRM_API void *ir_new_arr_d(struct obstack *obstack, size_t nelts, size_t elts_size);

FIRM_API void *ir_arr_resize(void *elts, size_t nelts, size_t elts_size);

FIRM_API void *ir_arr_setlen(void *elts, size_t nelts, size_t elts_size);

FIRM_API void ir_verify_arr(const void *elts);

#define ARR_ELTS_OFFS offsetof(ir_arr_descr, elts)
#define ARR_DESCR(elts) ((ir_arr_descr *)(void *)((char *)(elts) - ARR_ELTS_OFFS))

static inline void ARR_SHRINKLEN(void *arr, size_t new_len)
{
#ifndef NDEBUG
    ir_verify_arr(arr);
#endif
    assert(ARR_DESCR(arr)->nelts >= new_len);
    ARR_DESCR(arr)->nelts = new_len;
}

#define NEW_ARR_F(type, nelts) \
  ((type *)ir_new_arr_f((nelts), sizeof(type) * (nelts)))

#define NEW_ARR_FZ(type, nelts) \
    ((type*)memset(NEW_ARR_F(type, (nelts)), 0, sizeof(type) * (nelts)))

#define DUP_ARR_F(type, arr) \
  ((type*)memcpy(NEW_ARR_F(type, ARR_LEN((arr))), (arr), sizeof(type) * ARR_LEN((arr))))

FIRM_API void DEL_ARR_F(void *arr);

#define NEW_ARR_D(type, obstack, nelts)                                 \
  (  nelts                                                              \
   ? (type *)ir_new_arr_d((obstack), (nelts), sizeof(type) * (nelts))   \
   : (type *)arr_mt_descr.elts)

#define NEW_ARR_DZ(type, obstack, nelts) \
    ((type*)memset(NEW_ARR_D(type, (obstack), (nelts)), 0, sizeof(type) * (nelts)))

#define DUP_ARR_D(type, obstack, arr) \
  ((type*)memcpy(NEW_ARR_D(type, (obstack), ARR_LEN((arr))), (arr), sizeof(type) * ARR_LEN ((arr))))

static inline size_t ARR_LEN(void const *const arr)
{
#ifndef NDEBUG
    ir_verify_arr(arr);
#endif
    return ARR_DESCR(arr)->nelts;
}

#define ARR_RESIZE(type, arr, n) \
  ((arr) = (type*) ir_arr_resize((void *)(arr), (n), sizeof(type)))

#define ARR_SETLEN(type, arr, n) \
  ((arr) = (type*) ir_arr_setlen((void *)(arr), (n), sizeof(type) * (n)))

#define ARR_EXTEND(type, arr, delta) \
  ARR_RESIZE(type, (arr), ARR_LEN((arr)) + (delta))

#define ARR_EXTO(type, arr, n) \
    do { \
        if ((n) >= ARR_LEN(arr)) { ARR_RESIZE(type, arr, (n)+1); } \
    } while(0)

#define ARR_APP1(type, arr, elt) \
  (ARR_EXTEND(type, (arr), 1), (arr)[ARR_LEN((arr))-1] = (elt))

#include "../end.h"

#endif