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array.c
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// This file is a part of Julia. License is MIT: https://julialang.org/license
/*
array constructors and primitives
*/
#include <stdlib.h>
#include <string.h>
#ifdef _OS_WINDOWS_
#include <malloc.h>
#endif
#include "julia.h"
#include "julia_internal.h"
#include "julia_assert.h"
#ifdef __cplusplus
extern "C" {
#endif
#define JL_ARRAY_IMPL_NUL 1
#define JL_ARRAY_ALIGN(jl_value, nbytes) LLT_ALIGN(jl_value, nbytes)
// array constructors ---------------------------------------------------------
JL_DLLEXPORT int jl_array_store_unboxed(jl_value_t *eltype)
{
size_t fsz = 0, al = 0;
return jl_islayout_inline(eltype, &fsz, &al);
}
STATIC_INLINE jl_value_t *jl_array_owner(jl_array_t *a)
{
if (a->flags.how == 3) {
a = (jl_array_t*)jl_array_data_owner(a);
assert(jl_is_string(a) || a->flags.how != 3);
}
return (jl_value_t*)a;
}
#if defined(_P64) && defined(UINT128MAX)
typedef __uint128_t wideint_t;
#else
typedef uint64_t wideint_t;
#endif
size_t jl_arr_xtralloc_limit = 0;
#define MAXINTVAL (((size_t)-1)>>1)
static jl_array_t *_new_array_(jl_value_t *atype, uint32_t ndims, size_t *dims,
int isunboxed, int elsz)
{
jl_ptls_t ptls = jl_get_ptls_states();
size_t i, tot, nel=1;
void *data;
jl_array_t *a;
for(i=0; i < ndims; i++) {
wideint_t prod = (wideint_t)nel * (wideint_t)dims[i];
if (prod > (wideint_t) MAXINTVAL)
jl_error("invalid Array dimensions");
nel = prod;
}
int isunion = atype != NULL && jl_is_uniontype(jl_tparam0(atype));
if (isunboxed) {
wideint_t prod = (wideint_t)elsz * (wideint_t)nel;
if (prod > (wideint_t) MAXINTVAL)
jl_error("invalid Array size");
tot = prod;
if (elsz == 1 && !isunion) {
// extra byte for all julia allocated byte arrays
tot++;
}
if (isunion) {
// an extra byte for each isbits union array element, stored directly after the last array element
tot += nel;
}
}
else {
wideint_t prod = (wideint_t)sizeof(void*) * (wideint_t)nel;
if (prod > (wideint_t) MAXINTVAL)
jl_error("invalid Array size");
tot = prod;
}
int ndimwords = jl_array_ndimwords(ndims);
int tsz = JL_ARRAY_ALIGN(sizeof(jl_array_t) + ndimwords*sizeof(size_t), JL_CACHE_BYTE_ALIGNMENT);
if (tot <= ARRAY_INLINE_NBYTES) {
if (isunboxed && elsz >= 4)
tsz = JL_ARRAY_ALIGN(tsz, JL_SMALL_BYTE_ALIGNMENT); // align data area
size_t doffs = tsz;
tsz += tot;
tsz = JL_ARRAY_ALIGN(tsz, JL_SMALL_BYTE_ALIGNMENT); // align whole object
a = (jl_array_t*)jl_gc_alloc(ptls, tsz, atype);
// No allocation or safepoint allowed after this
a->flags.how = 0;
data = (char*)a + doffs;
if ((tot > 0 && !isunboxed) || isunion)
memset(data, 0, tot);
}
else {
tsz = JL_ARRAY_ALIGN(tsz, JL_CACHE_BYTE_ALIGNMENT); // align whole object
data = jl_gc_managed_malloc(tot);
// Allocate the Array **after** allocating the data
// to make sure the array is still young
a = (jl_array_t*)jl_gc_alloc(ptls, tsz, atype);
// No allocation or safepoint allowed after this
a->flags.how = 2;
jl_gc_track_malloced_array(ptls, a);
if (!isunboxed || isunion)
// need to zero out isbits union array selector bytes to ensure a valid type index
memset(data, 0, tot);
}
a->flags.pooled = tsz <= GC_MAX_SZCLASS;
a->data = data;
if (JL_ARRAY_IMPL_NUL && elsz == 1)
((char*)data)[tot - 1] = '\0';
#ifdef STORE_ARRAY_LEN
a->length = nel;
#endif
a->flags.ndims = ndims;
a->flags.ptrarray = !isunboxed;
a->elsize = elsz;
a->flags.isshared = 0;
a->flags.isaligned = 1;
a->offset = 0;
if (ndims == 1) {
a->nrows = nel;
a->maxsize = nel;
}
else {
size_t *adims = &a->nrows;
for(i=0; i < ndims; i++)
adims[i] = dims[i];
}
return a;
}
static inline jl_array_t *_new_array(jl_value_t *atype, uint32_t ndims, size_t *dims)
{
jl_value_t *eltype = jl_tparam0(atype);
size_t elsz = 0, al = 0;
int isunboxed = jl_islayout_inline(eltype, &elsz, &al);
if (!isunboxed) {
elsz = sizeof(void*);
al = elsz;
}
return _new_array_(atype, ndims, dims, isunboxed, elsz);
}
jl_array_t *jl_new_array_for_deserialization(jl_value_t *atype, uint32_t ndims, size_t *dims,
int isunboxed, int elsz)
{
return _new_array_(atype, ndims, dims, isunboxed, elsz);
}
#ifndef JL_NDEBUG
static inline int is_ntuple_long(jl_value_t *v)
{
if (!jl_is_tuple(v))
return 0;
size_t nfields = jl_nfields(v);
for (size_t i = 0; i < nfields; i++) {
if (jl_field_type(jl_typeof(v), i) != (jl_value_t*)jl_long_type) {
return 0;
}
}
return 1;
}
#endif
JL_DLLEXPORT jl_array_t *jl_reshape_array(jl_value_t *atype, jl_array_t *data,
jl_value_t *_dims)
{
jl_ptls_t ptls = jl_get_ptls_states();
jl_array_t *a;
size_t ndims = jl_nfields(_dims);
assert(is_ntuple_long(_dims));
size_t *dims = (size_t*)_dims;
assert(jl_types_equal(jl_tparam0(jl_typeof(data)), jl_tparam0(atype)));
int ndimwords = jl_array_ndimwords(ndims);
int tsz = JL_ARRAY_ALIGN(sizeof(jl_array_t) + ndimwords * sizeof(size_t) + sizeof(void*), JL_SMALL_BYTE_ALIGNMENT);
a = (jl_array_t*)jl_gc_alloc(ptls, tsz, atype);
// No allocation or safepoint allowed after this
a->flags.pooled = tsz <= GC_MAX_SZCLASS;
a->flags.ndims = ndims;
a->offset = 0;
a->data = NULL;
a->flags.isaligned = data->flags.isaligned;
jl_array_t *owner = (jl_array_t*)jl_array_owner(data);
jl_value_t *eltype = jl_tparam0(atype);
size_t elsz = 0, align = 0;
int isboxed = !jl_islayout_inline(eltype, &elsz, &align);
assert(isboxed == data->flags.ptrarray);
if (!isboxed) {
a->elsize = elsz;
jl_value_t *ownerty = jl_typeof(owner);
size_t oldelsz = 0, oldalign = 0;
if (ownerty == (jl_value_t*)jl_string_type) {
oldalign = 1;
}
else {
jl_islayout_inline(jl_tparam0(ownerty), &oldelsz, &oldalign);
}
if (oldalign < align)
jl_exceptionf(jl_argumenterror_type,
"reinterpret from alignment %d bytes to alignment %d bytes not allowed",
(int) oldalign, (int) align);
a->flags.ptrarray = 0;
}
else {
a->elsize = sizeof(void*);
a->flags.ptrarray = 1;
}
// if data is itself a shared wrapper,
// owner should point back to the original array
jl_array_data_owner(a) = (jl_value_t*)owner;
a->flags.how = 3;
a->data = data->data;
a->flags.isshared = 1;
data->flags.isshared = 1;
if (ndims == 1) {
size_t l = dims[0];
#ifdef STORE_ARRAY_LEN
a->length = l;
#endif
a->nrows = l;
a->maxsize = l;
}
else {
size_t *adims = &a->nrows;
size_t l = 1;
wideint_t prod;
for (size_t i = 0; i < ndims; i++) {
adims[i] = dims[i];
prod = (wideint_t)l * (wideint_t)adims[i];
if (prod > (wideint_t) MAXINTVAL)
jl_error("invalid Array dimensions");
l = prod;
}
#ifdef STORE_ARRAY_LEN
a->length = l;
#endif
}
return a;
}
JL_DLLEXPORT jl_array_t *jl_string_to_array(jl_value_t *str)
{
jl_ptls_t ptls = jl_get_ptls_states();
jl_array_t *a;
int ndimwords = jl_array_ndimwords(1);
int tsz = JL_ARRAY_ALIGN(sizeof(jl_array_t) + ndimwords*sizeof(size_t) + sizeof(void*), JL_SMALL_BYTE_ALIGNMENT);
a = (jl_array_t*)jl_gc_alloc(ptls, tsz, jl_array_uint8_type);
a->flags.pooled = tsz <= GC_MAX_SZCLASS;
a->flags.ndims = 1;
a->offset = 0;
a->data = jl_string_data(str);
a->flags.isaligned = 0;
a->elsize = 1;
a->flags.ptrarray = 0;
jl_array_data_owner(a) = str;
a->flags.how = 3;
a->flags.isshared = 1;
size_t l = jl_string_len(str);
#ifdef STORE_ARRAY_LEN
a->length = l;
#endif
a->nrows = a->maxsize = l;
return a;
}
// own_buffer != 0 iff GC should call free() on this pointer eventually
JL_DLLEXPORT jl_array_t *jl_ptr_to_array_1d(jl_value_t *atype, void *data,
size_t nel, int own_buffer)
{
jl_ptls_t ptls = jl_get_ptls_states();
jl_array_t *a;
jl_value_t *eltype = jl_tparam0(atype);
int isunboxed = jl_array_store_unboxed(eltype);
size_t elsz;
unsigned align;
if (isunboxed && jl_is_uniontype(eltype))
jl_exceptionf(jl_argumenterror_type,
"unsafe_wrap: unspecified layout for union element type");
if (isunboxed) {
elsz = jl_datatype_size(eltype);
align = jl_datatype_align(eltype);
}
else {
align = elsz = sizeof(void*);
}
if (((uintptr_t)data) & (align - 1))
jl_exceptionf(jl_argumenterror_type,
"unsafe_wrap: pointer %p is not properly aligned to %u bytes", data, align);
int ndimwords = jl_array_ndimwords(1);
int tsz = JL_ARRAY_ALIGN(sizeof(jl_array_t) + ndimwords*sizeof(size_t), JL_CACHE_BYTE_ALIGNMENT);
a = (jl_array_t*)jl_gc_alloc(ptls, tsz, atype);
// No allocation or safepoint allowed after this
a->flags.pooled = tsz <= GC_MAX_SZCLASS;
a->data = data;
#ifdef STORE_ARRAY_LEN
a->length = nel;
#endif
a->elsize = elsz;
a->flags.ptrarray = !isunboxed;
a->flags.ndims = 1;
a->flags.isshared = 1;
a->flags.isaligned = 0; // TODO: allow passing memalign'd buffers
if (own_buffer) {
a->flags.how = 2;
jl_gc_track_malloced_array(ptls, a);
jl_gc_count_allocd(nel*elsz + (elsz == 1 ? 1 : 0));
}
else {
a->flags.how = 0;
}
a->nrows = nel;
a->maxsize = nel;
a->offset = 0;
return a;
}
JL_DLLEXPORT jl_array_t *jl_ptr_to_array(jl_value_t *atype, void *data,
jl_value_t *_dims, int own_buffer)
{
jl_ptls_t ptls = jl_get_ptls_states();
size_t nel = 1;
jl_array_t *a;
size_t ndims = jl_nfields(_dims);
wideint_t prod;
assert(is_ntuple_long(_dims));
size_t *dims = (size_t*)_dims;
for (size_t i = 0; i < ndims; i++) {
prod = (wideint_t)nel * (wideint_t)dims[i];
if (prod > (wideint_t) MAXINTVAL)
jl_error("invalid Array dimensions");
nel = prod;
}
if (__unlikely(ndims == 1))
return jl_ptr_to_array_1d(atype, data, nel, own_buffer);
jl_value_t *eltype = jl_tparam0(atype);
int isunboxed = jl_array_store_unboxed(eltype);
size_t elsz;
unsigned align;
if (isunboxed && jl_is_uniontype(eltype))
jl_exceptionf(jl_argumenterror_type,
"unsafe_wrap: unspecified layout for union element type");
if (isunboxed) {
elsz = jl_datatype_size(eltype);
align = jl_datatype_align(eltype);
}
else {
align = elsz = sizeof(void*);
}
if (((uintptr_t)data) & (align - 1))
jl_exceptionf(jl_argumenterror_type,
"unsafe_wrap: pointer %p is not properly aligned to %u bytes", data, align);
int ndimwords = jl_array_ndimwords(ndims);
int tsz = JL_ARRAY_ALIGN(sizeof(jl_array_t) + ndimwords*sizeof(size_t), JL_CACHE_BYTE_ALIGNMENT);
a = (jl_array_t*)jl_gc_alloc(ptls, tsz, atype);
// No allocation or safepoint allowed after this
a->flags.pooled = tsz <= GC_MAX_SZCLASS;
a->data = data;
#ifdef STORE_ARRAY_LEN
a->length = nel;
#endif
a->elsize = elsz;
a->flags.ptrarray = !isunboxed;
a->flags.ndims = ndims;
a->offset = 0;
a->flags.isshared = 1;
a->flags.isaligned = 0;
if (own_buffer) {
a->flags.how = 2;
jl_gc_track_malloced_array(ptls, a);
jl_gc_count_allocd(nel*elsz + (elsz == 1 ? 1 : 0));
}
else {
a->flags.how = 0;
}
assert(ndims != 1); // handled above
memcpy(&a->nrows, dims, ndims * sizeof(size_t));
return a;
}
JL_DLLEXPORT jl_array_t *jl_new_array(jl_value_t *atype, jl_value_t *_dims)
{
size_t ndims = jl_nfields(_dims);
assert(is_ntuple_long(_dims));
return _new_array(atype, ndims, (size_t*)_dims);
}
JL_DLLEXPORT jl_array_t *jl_alloc_array_1d(jl_value_t *atype, size_t nr)
{
return _new_array(atype, 1, &nr);
}
JL_DLLEXPORT jl_array_t *jl_alloc_array_2d(jl_value_t *atype, size_t nr,
size_t nc)
{
size_t d[2] = {nr, nc};
return _new_array(atype, 2, &d[0]);
}
JL_DLLEXPORT jl_array_t *jl_alloc_array_3d(jl_value_t *atype, size_t nr,
size_t nc, size_t z)
{
size_t d[3] = {nr, nc, z};
return _new_array(atype, 3, &d[0]);
}
JL_DLLEXPORT jl_array_t *jl_pchar_to_array(const char *str, size_t len)
{
jl_array_t *a = jl_alloc_array_1d(jl_array_uint8_type, len);
memcpy(a->data, str, len);
return a;
}
JL_DLLEXPORT jl_value_t *jl_array_to_string(jl_array_t *a)
{
if (a->flags.how == 3 && a->offset == 0 && a->elsize == 1 &&
(jl_array_ndims(a) != 1 ||
((a->maxsize + sizeof(void*) + 1 <= GC_MAX_SZCLASS) == (jl_array_len(a) + sizeof(void*) + 1 <= GC_MAX_SZCLASS)))) {
jl_value_t *o = jl_array_data_owner(a);
if (jl_is_string(o)) {
a->flags.isshared = 1;
*(size_t*)o = jl_array_len(a);
return o;
}
}
return jl_pchar_to_string((const char*)jl_array_data(a), jl_array_len(a));
}
JL_DLLEXPORT jl_value_t *jl_pchar_to_string(const char *str, size_t len)
{
jl_value_t *s = jl_gc_alloc(jl_get_ptls_states(), sizeof(size_t)+len+1, jl_string_type);
*(size_t*)s = len;
memcpy((char*)s + sizeof(size_t), str, len);
((char*)s + sizeof(size_t))[len] = 0;
return s;
}
JL_DLLEXPORT jl_value_t *jl_alloc_string(size_t len)
{
jl_value_t *s = jl_gc_alloc(jl_get_ptls_states(), sizeof(size_t)+len+1, jl_string_type);
*(size_t*)s = len;
((char*)s + sizeof(size_t))[len] = 0;
return s;
}
JL_DLLEXPORT jl_value_t *jl_cstr_to_string(const char *str)
{
return jl_pchar_to_string(str, strlen(str));
}
JL_DLLEXPORT jl_array_t *jl_alloc_vec_any(size_t n)
{
return jl_alloc_array_1d(jl_array_any_type, n);
}
JL_DLLEXPORT jl_value_t *jl_apply_array_type(jl_value_t *type, size_t dim)
{
jl_value_t *boxed_dim = jl_box_long(dim);
JL_GC_PUSH1(&boxed_dim);
jl_value_t *ret = jl_apply_type2((jl_value_t*)jl_array_type, type, boxed_dim);
JL_GC_POP();
return ret;
}
// array primitives -----------------------------------------------------------
#ifndef STORE_ARRAY_LEN
JL_DLLEXPORT size_t jl_array_len_(jl_array_t *a)
{
size_t l = 1;
for(size_t i=0; i < jl_array_ndims(a); i++)
l *= jl_array_dim(a, i);
return l;
}
#endif
JL_DLLEXPORT jl_value_t *jl_arrayref(jl_array_t *a, size_t i)
{
assert(i < jl_array_len(a));
jl_value_t *elt;
if (!a->flags.ptrarray) {
jl_value_t *eltype = (jl_value_t*)jl_tparam0(jl_typeof(a));
if (jl_is_uniontype(eltype)) {
// isbits union selector bytes are always stored directly after the last array element
uint8_t sel = ((uint8_t*)a->data)[jl_array_len(a) * a->elsize + i];
eltype = jl_nth_union_component(eltype, sel);
if (jl_is_datatype_singleton((jl_datatype_t*)eltype))
return ((jl_datatype_t*)eltype)->instance;
}
elt = jl_new_bits(eltype, &((char*)a->data)[i * a->elsize]);
}
else {
elt = ((jl_value_t**)a->data)[i];
if (elt == NULL) {
jl_throw(jl_undefref_exception);
}
}
return elt;
}
JL_DLLEXPORT int jl_array_isassigned(jl_array_t *a, size_t i)
{
if (a->flags.ptrarray)
return ((jl_value_t**)jl_array_data(a))[i] != NULL;
return 1;
}
int jl_array_isdefined(jl_value_t **args0, int nargs)
{
assert(jl_is_array(args0[0]));
jl_depwarn("`isdefined(a::Array, i::Int)` is deprecated, "
"use `isassigned(a, i)` instead", (jl_value_t*)jl_symbol("isdefined"));
jl_array_t *a = (jl_array_t*)args0[0];
jl_value_t **args = &args0[1];
size_t nidxs = nargs-1;
size_t i=0;
size_t k, stride=1;
size_t nd = jl_array_ndims(a);
for(k=0; k < nidxs; k++) {
if (!jl_is_long(args[k]))
jl_type_error("isdefined", (jl_value_t*)jl_long_type, args[k]);
size_t ii = jl_unbox_long(args[k])-1;
i += ii * stride;
size_t d = k>=nd ? 1 : jl_array_dim(a, k);
if (k < nidxs-1 && ii >= d)
return 0;
stride *= d;
}
for(; k < nd; k++)
stride *= jl_array_dim(a, k);
if (i >= stride)
return 0;
if (a->flags.ptrarray)
return ((jl_value_t**)jl_array_data(a))[i] != NULL;
return 1;
}
JL_DLLEXPORT void jl_arrayset(jl_array_t *a, jl_value_t *rhs, size_t i)
{
assert(i < jl_array_len(a));
jl_value_t *eltype = jl_tparam0(jl_typeof(a));
if (eltype != (jl_value_t*)jl_any_type) {
if (!jl_isa(rhs, eltype))
jl_type_error("arrayset", eltype, rhs);
}
if (!a->flags.ptrarray) {
if (jl_is_uniontype(eltype)) {
uint8_t *psel = &((uint8_t*)a->data)[jl_array_len(a) * a->elsize + i];
unsigned nth = 0;
if (!jl_find_union_component(eltype, jl_typeof(rhs), &nth))
assert(0 && "invalid arrayset to isbits union");
*psel = nth;
if (jl_is_datatype_singleton((jl_datatype_t*)jl_typeof(rhs)))
return;
}
jl_assign_bits(&((char*)a->data)[i * a->elsize], rhs);
}
else {
((jl_value_t**)a->data)[i] = rhs;
jl_gc_wb(jl_array_owner(a), rhs);
}
}
JL_DLLEXPORT void jl_arrayunset(jl_array_t *a, size_t i)
{
if (i >= jl_array_len(a))
jl_bounds_error_int((jl_value_t*)a, i+1);
char *ptail = (char*)a->data + i*a->elsize;
if (a->flags.ptrarray)
memset(ptail, 0, a->elsize);
}
// at this size and bigger, allocate resized array data with malloc
#define MALLOC_THRESH 1048576
// Resize the buffer to a max size of `newlen`
// The buffer can either be newly allocated or realloc'd, the return
// value is 1 if a new buffer is allocated and 0 if it is realloc'd.
// the caller needs to take care of moving the data from the old buffer
// to the new one if necessary.
// When this function returns, the `->data` pointer always points to
// the **beginning** of the new buffer.
static int NOINLINE array_resize_buffer(jl_array_t *a, size_t newlen)
{
jl_ptls_t ptls = jl_get_ptls_states();
assert(!a->flags.isshared || a->flags.how == 3);
size_t elsz = a->elsize;
size_t nbytes = newlen * elsz;
size_t oldnbytes = a->maxsize * elsz;
size_t oldoffsnb = a->offset * elsz;
size_t oldlen = a->nrows;
assert(nbytes >= oldnbytes);
if (elsz == 1) {
nbytes++;
oldnbytes++;
}
int is_discriminated_union = !a->flags.ptrarray && jl_is_uniontype(jl_tparam0(jl_typeof(a)));
if (is_discriminated_union) {
nbytes += newlen;
oldnbytes += oldlen;
}
int newbuf = 0;
if (a->flags.how == 2) {
// already malloc'd - use realloc
char *olddata = (char*)a->data - oldoffsnb;
a->data = jl_gc_managed_realloc(olddata, nbytes, oldnbytes,
a->flags.isaligned, (jl_value_t*)a);
}
else if (a->flags.how == 3 && jl_is_string(jl_array_data_owner(a)) && !is_discriminated_union) {
// if data is in a String, keep it that way
jl_value_t *s;
if (a->flags.isshared) {
s = jl_alloc_string(nbytes - (elsz == 1));
newbuf = 1;
}
else {
s = jl_gc_realloc_string(jl_array_data_owner(a), nbytes - (elsz == 1));
}
jl_array_data_owner(a) = s;
jl_gc_wb(a, s);
a->data = jl_string_data(s);
}
else {
newbuf = 1;
if (
#ifdef _P64
nbytes >= MALLOC_THRESH
#else
elsz > 4
#endif
) {
a->data = jl_gc_managed_malloc(nbytes);
jl_gc_track_malloced_array(ptls, a);
a->flags.how = 2;
a->flags.isaligned = 1;
}
else {
a->data = jl_gc_alloc_buf(ptls, nbytes);
a->flags.how = 1;
jl_gc_wb_buf(a, a->data, nbytes);
}
}
if (JL_ARRAY_IMPL_NUL && elsz == 1)
memset((char*)a->data + oldnbytes - 1, 0, nbytes - oldnbytes + 1);
(void)oldlen;
assert(oldlen == a->nrows &&
"Race condition detected: recursive resizing on the same array.");
a->flags.isshared = 0;
a->maxsize = newlen;
return newbuf;
}
static void NOINLINE array_try_unshare(jl_array_t *a)
{
if (a->flags.isshared) {
if (a->flags.how != 3)
jl_error("cannot resize array with shared data");
// allow resizing when data is shared with a String
if (jl_is_string(jl_array_data_owner(a)))
return;
assert(a->offset == 0);
size_t len = jl_array_nrows(a);
size_t es = a->elsize;
size_t nbytes = len * es;
if (!a->flags.ptrarray && jl_is_uniontype(jl_tparam0(jl_typeof(a)))) {
nbytes += len;
}
char *olddata = (char*)a->data;
int newbuf = array_resize_buffer(a, len);
assert(newbuf);
(void)newbuf;
memcpy(a->data, olddata, nbytes);
}
}
static size_t limit_overallocation(jl_array_t *a, size_t alen, size_t newlen, size_t inc)
{
// Limit overallocation to jl_arr_xtralloc_limit
size_t es = a->elsize;
size_t xtra_elems_mem = (newlen - a->offset - alen - inc) * es;
if (xtra_elems_mem > jl_arr_xtralloc_limit) {
// prune down
return alen + inc + a->offset + (jl_arr_xtralloc_limit / es);
}
return newlen;
}
STATIC_INLINE void jl_array_grow_at_beg(jl_array_t *a, size_t idx, size_t inc,
size_t n)
{
// designed to handle the case of growing and shrinking at both ends
if (__unlikely(a->flags.isshared)) {
if (a->flags.how != 3)
jl_error("cannot resize array with shared data");
if (inc == 0) {
// If inc > 0, it will always trigger the slow path and unshare the
// buffer
array_try_unshare(a);
return;
}
}
size_t newnrows = n + inc;
size_t elsz = a->elsize;
size_t nbinc = inc * elsz;
char *data = (char*)a->data;
char *newdata;
int isbitsunion = !a->flags.ptrarray && jl_is_uniontype(jl_tparam0(jl_typeof(a)));
if (a->offset >= inc) {
newdata = data - nbinc;
a->offset -= inc;
if (idx > 0)
memmove(newdata, data, idx * elsz);
if (isbitsunion) {
// move isbits union select bytes back by `inc` & zero out new selector bytes
memmove(data + n * elsz + idx + inc, data + n * elsz + idx, n - idx);
memset(data + n * elsz + idx, 0, inc);
}
}
else {
size_t oldoffsnb = a->offset * elsz;
size_t nb1 = idx * elsz;
if (inc > (a->maxsize - n) / 2 - (a->maxsize - n) / 20) {
size_t newlen = a->maxsize == 0 ? inc * 2 : a->maxsize * 2;
while (n + 2 * inc > newlen - a->offset)
newlen *= 2;
newlen = limit_overallocation(a, n, newlen, 2 * inc);
size_t newoffset = (newlen - newnrows) / 2;
if (!array_resize_buffer(a, newlen))
data = (char*)a->data + oldoffsnb;
newdata = (char*)a->data + newoffset * elsz;
if (isbitsunion) {
memmove(newdata + newnrows * elsz, data + n * elsz, idx);
memmove(newdata + newnrows * elsz + idx + inc, data + n * elsz + idx, n - idx);
memset(newdata + newnrows * elsz + idx, 0, inc);
}
// We could use memcpy if resizing allocates a new buffer,
// hopefully it's not a particularly important optimization.
if (idx > 0 && newdata < data)
memmove(newdata, data, nb1);
memmove(newdata + nbinc + nb1, data + nb1, n * elsz - nb1);
if (idx > 0 && newdata > data)
memmove(newdata, data, nb1);
a->offset = newoffset;
}
else {
a->offset = (a->maxsize - newnrows) / 2;
newdata = data - oldoffsnb + a->offset * elsz;
if (isbitsunion) {
memmove(newdata + newnrows * elsz + idx + inc, data + n * elsz + idx, n - idx);
memset(newdata + newnrows * elsz + idx, 0, inc);
}
// We could use memcpy if resizing allocates a new buffer,
// hopefully it's not a particularly important optimization.
if (idx > 0 && newdata < data)
memmove(newdata, data, nb1);
memmove(newdata + nbinc + nb1, data + nb1, n * elsz - nb1);
if (idx > 0 && newdata > data)
memmove(newdata, data, nb1);
}
}
#ifdef STORE_ARRAY_LEN
a->length = newnrows;
#endif
a->nrows = newnrows;
a->data = newdata;
if (a->flags.ptrarray) {
memset(newdata + idx * elsz, 0, nbinc);
}
}
STATIC_INLINE void jl_array_grow_at_end(jl_array_t *a, size_t idx,
size_t inc, size_t n)
{
// optimized for the case of only growing and shrinking at the end
if (__unlikely(a->flags.isshared)) {
if (a->flags.how != 3)
jl_error("cannot resize array with shared data");
if (inc == 0) {
// If inc > 0, it will always trigger the slow path and unshare the
// buffer
array_try_unshare(a);
return;
}
}
size_t elsz = a->elsize;
char *data = (char*)a->data;
int isbitsunion = !a->flags.ptrarray && jl_is_uniontype(jl_tparam0(jl_typeof(a)));
size_t oldmaxsize = jl_array_len(a);
int has_gap = n > idx;
size_t reqmaxsize = a->offset + n + inc;
if (__unlikely(reqmaxsize > a->maxsize)) {
size_t nb1 = idx * elsz;
size_t nbinc = inc * elsz;
// if the requested size is more than 2x current maxsize, grow exactly
// otherwise double the maxsize
size_t newmaxsize = reqmaxsize >= a->maxsize * 2
? (reqmaxsize < 4 ? 4 : reqmaxsize)
: a->maxsize * 2;
newmaxsize = limit_overallocation(a, n, newmaxsize, inc);
int newbuf = array_resize_buffer(a, newmaxsize);
char *newdata = (char*)a->data + a->offset * elsz;
if (newbuf) {
memcpy(newdata, data, nb1);
if (isbitsunion) {
memmove(newdata + (oldmaxsize + inc) * elsz, data + oldmaxsize * elsz, idx);
}
if (has_gap) {
memcpy(newdata + nb1 + nbinc, data + nb1, n * elsz - nb1);
if (isbitsunion) {
memmove(newdata + (oldmaxsize + inc) * elsz + idx + inc, data + oldmaxsize * elsz + idx, n - idx);
memset(newdata + (oldmaxsize + inc) * elsz + idx, 0, inc);
}
}
}
else if (has_gap) {
if (isbitsunion) {
memmove(newdata + (oldmaxsize + inc) * elsz, newdata + oldmaxsize * elsz, idx);
memmove(newdata + (oldmaxsize + inc) * elsz + idx + inc, newdata + oldmaxsize * elsz + idx, n - idx);
memset(newdata + (oldmaxsize + inc) * elsz + idx, 0, inc);
}
memmove(newdata + nb1 + nbinc, newdata + nb1, n * elsz - nb1);
}
a->data = data = newdata;
}
else if (has_gap) {
size_t nb1 = idx * elsz;
if (isbitsunion) {
memmove(data + (n + inc) * elsz + idx + inc, data + n * elsz + idx, n - idx);
memmove(data + (n + inc) * elsz, data + n * elsz, idx);
memset(data + (n + inc) * elsz + idx, 0, inc);
}
memmove(data + nb1 + inc * elsz, data + nb1, n * elsz - nb1);
}
else {
if (isbitsunion) {
// need to move isbits union selector bytes back & zero out new bytes
memmove(data + (n + inc) * elsz, data + n * elsz, oldmaxsize);
memset(data + (n + inc) * elsz + idx, 0, inc);
}
}
size_t newnrows = n + inc;
#ifdef STORE_ARRAY_LEN
a->length = newnrows;
#endif
a->nrows = newnrows;
if (a->flags.ptrarray) {
memset(data + idx * elsz, 0, inc * elsz);
}
}
JL_DLLEXPORT void jl_array_grow_at(jl_array_t *a, ssize_t idx, size_t inc)
{
// No need to explicitly unshare.
// Shared arrays are guaranteed to trigger the slow path for growing.
size_t n = jl_array_nrows(a);
if (idx < 0 || idx > n)
jl_bounds_error_int((jl_value_t*)a, idx + 1);
if (idx + 1 < n / 2) {
jl_array_grow_at_beg(a, idx, inc, n);
}
else {
jl_array_grow_at_end(a, idx, inc, n);
}
}
JL_DLLEXPORT void jl_array_grow_end(jl_array_t *a, size_t inc)
{
size_t n = jl_array_nrows(a);
jl_array_grow_at_end(a, n, inc, n);
}
JL_DLLEXPORT void jl_array_grow_beg(jl_array_t *a, size_t inc)
{
size_t n = jl_array_nrows(a);
jl_array_grow_at_beg(a, 0, inc, n);
}
static size_t jl_array_limit_offset(jl_array_t *a, size_t offset)
{
// make sure offset doesn't grow forever due to deleting at beginning
// and growing at end
if (offset >= 13 * a->maxsize / 20)
offset = 17 * (a->maxsize - a->nrows) / 100;
#ifdef _P64
while (offset > (size_t)UINT32_MAX) {
offset /= 2;
}
#endif
return offset;
}
STATIC_INLINE void jl_array_del_at_beg(jl_array_t *a, size_t idx, size_t dec,
size_t n)
{
// no error checking
// assume inbounds, assume unshared
size_t elsz = a->elsize;
size_t offset = a->offset;
int isbitsunion = !a->flags.ptrarray && jl_is_uniontype(jl_tparam0(jl_typeof(a)));
offset += dec;
#ifdef STORE_ARRAY_LEN
a->length = n - dec;
#endif
a->nrows = n - dec;
size_t newoffs = jl_array_limit_offset(a, offset);
assert(newoffs <= offset);
size_t nbdec = dec * elsz;
if (__unlikely(newoffs != offset) || idx > 0) {
char *olddata = (char*)a->data;
char *newdata = olddata - (a->offset - newoffs) * elsz;
size_t nb1 = idx * elsz; // size in bytes of the first block
size_t nbtotal = a->nrows * elsz; // size in bytes of the new array
// Implicit '\0' for byte arrays
if (elsz == 1 && !isbitsunion)
nbtotal++;
if (idx > 0) {
memmove(newdata, olddata, nb1);
if (isbitsunion) {
memmove(newdata + nbtotal, olddata + n * elsz, idx);
memset(newdata + nbtotal + idx, 0, dec);
}
}
// Move the rest of the data if the offset changed
if (newoffs != offset)
memmove(newdata + nb1, olddata + nb1 + nbdec, nbtotal - nb1);
if (isbitsunion) {
memmove(newdata + nbtotal + idx, olddata + n * elsz + idx + dec, n - idx);
}
a->data = newdata;
}
else {
char *data = (char*)a->data;
a->data = data + nbdec;
if (isbitsunion) {
// move isbits union selector bytes forward, overwriting the deleted bytes
memmove(data + elsz * n, data + elsz * n + dec, n - dec);
}
}
a->offset = newoffs;
}
STATIC_INLINE void jl_array_del_at_end(jl_array_t *a, size_t idx, size_t dec,
size_t n)
{
// no error checking
// assume inbounds, assume unshared
char *data = (char*)a->data;
size_t elsz = a->elsize;
int isbitsunion = !a->flags.ptrarray && jl_is_uniontype(jl_tparam0(jl_typeof(a)));
size_t last = idx + dec;
if (n > last) {
memmove(data + idx * elsz, data + last * elsz, (n - last) * elsz);
if (isbitsunion) {
memmove(data + n * elsz + idx, data + n * elsz + last, n - last);
}
}
n -= dec;
if (elsz == 1 && !isbitsunion)
data[n] = 0;
a->nrows = n;
#ifdef STORE_ARRAY_LEN
a->length = n;
#endif
if (isbitsunion) {
// move last isbits union selector bytes forward to close the gap of deleted elements
memmove(data + n * elsz, data + (n + dec) * elsz, n);
}
}
JL_DLLEXPORT void jl_array_del_at(jl_array_t *a, ssize_t idx, size_t dec)
{
size_t n = jl_array_nrows(a);
size_t last = idx + dec;
if (__unlikely(idx < 0))
jl_bounds_error_int((jl_value_t*)a, idx + 1);
if (__unlikely(last > n))
jl_bounds_error_int((jl_value_t*)a, last);