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/* go-make-slice.c -- make a slice.

   Copyright 2011 The Go Authors. All rights reserved.

   Use of this source code is governed by a BSD-style

   license that can be found in the LICENSE file.  */

#include <stdint.h>

#include "go-alloc.h"

#include "go-assert.h"

#include "go-panic.h"

#include "go-type.h"

#include "array.h"

#include "runtime.h"

#include "arch.h"

#include "malloc.h"

struct __go_open_array

__go_make_slice2 (const struct __go_type_descriptor *td, uintptr_t len,

                  uintptr_t cap)

{

  const struct __go_slice_type* std;

  int ilen;

  int icap;

  uintptr_t size;

  struct __go_open_array ret;

  unsigned int flag;

  __go_assert (td->__code == GO_SLICE);

  std = (const struct __go_slice_type *) td;

  ilen = (int) len;

  if (ilen < 0 || (uintptr_t) ilen != len)

    runtime_panicstring ("makeslice: len out of range");

  icap = (int) cap;

  if (cap < len

      || (uintptr_t) icap != cap

      || (std->__element_type->__size > 0

          && cap > (uintptr_t) -1U / std->__element_type->__size))

    runtime_panicstring ("makeslice: cap out of range");

  ret.__count = ilen;

  ret.__capacity = icap;

  size = cap * std->__element_type->__size;

  flag = ((std->__element_type->__code & GO_NO_POINTERS) != 0

          ? FlagNoPointers

          : 0);

  ret.__values = runtime_mallocgc (size, flag, 1, 1);

  return ret;

}

struct __go_open_array

__go_make_slice1 (const struct __go_type_descriptor *td, uintptr_t len)

{

  return __go_make_slice2 (td, len, len);

}

struct __go_open_array

__go_make_slice2_big (const struct __go_type_descriptor *td, uint64_t len,

                      uint64_t cap)

{

  uintptr_t slen;

  uintptr_t scap;

  slen = (uintptr_t) len;

  if ((uint64_t) slen != len)

    runtime_panicstring ("makeslice: len out of range");

  scap = (uintptr_t) cap;

  if ((uint64_t) scap != cap)

    runtime_panicstring ("makeslice: cap out of range");

  return __go_make_slice2 (td, slen, scap);

}

struct __go_open_array

__go_make_slice1_big (const struct __go_type_descriptor *td, uint64_t len)

{

  return __go_make_slice2_big (td, len, len);

}