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<?php
declare(strict_types=1);
namespace Nsfisis\Waddiwasi\Execution;
use Nsfisis\Waddiwasi\Structure\Types\MemType;
final class MemInst
{
/**
* @var list<string>
*/
private array $data;
private const PAGE_SIZE = 64 * 1024;
public function __construct(
public readonly MemType $type,
) {
$minSize = $type->limits->min;
// @todo hack
$minSize *= 8;
$this->data = array_fill(0, $minSize, str_repeat("\0", self::PAGE_SIZE));
}
public function size(): int
{
return count($this->data) * self::PAGE_SIZE;
}
/**
* @return ?S32
*/
public function loadI32(int $ptr, int $n, bool $signed): ?int
{
assert($n !== 4 || $signed);
$buf = $this->sliceNBytes($ptr, $n);
if ($buf === null) {
return null;
}
$result = unpack(match ($n) {
1 => $signed ? 'c' : 'C',
2 => $signed ? 's' : 'S',
4 => 'l',
default => throw new \LogicException('Invalid byte length'),
}, $buf);
assert($result !== false);
return $result[1];
}
/**
* @return ?S64
*/
public function loadI64(int $ptr, int $n, bool $signed): ?int
{
assert($n !== 8 || $signed);
$buf = $this->sliceNBytes($ptr, $n);
if ($buf === null) {
return null;
}
$result = unpack(match ($n) {
1 => $signed ? 'c' : 'C',
2 => $signed ? 's' : 'S',
4 => $signed ? 'l' : 'L',
8 => 'q',
default => throw new \LogicException('Invalid byte length'),
}, $buf);
assert($result !== false);
return $result[1];
}
/**
* @return ?F32
*/
public function loadF32(int $ptr): ?float
{
$buf = $this->sliceNBytes($ptr, 4);
if ($buf === null) {
return null;
}
$result = unpack('f', $buf);
assert($result !== false);
return $result[1];
}
/**
* @return ?F64
*/
public function loadF64(int $ptr): ?float
{
$buf = $this->sliceNBytes($ptr, 8);
if ($buf === null) {
return null;
}
$result = unpack('d', $buf);
assert($result !== false);
return $result[1];
}
/**
* @return ?int
*/
public function loadByte(int $ptr): ?int
{
if ($this->size() < $ptr) {
return null;
}
$page = $this->data[intdiv($ptr, self::PAGE_SIZE)];
$result = unpack('C', $page, $ptr % self::PAGE_SIZE);
assert($result !== false);
$c = $result[1];
assert(0x00 <= $c && $c <= 0xFF);
return $c;
}
/**
* @return bool
*/
public function storeByte(int $ptr, int $c): bool
{
assert(0x00 <= $c && $c <= 0xFF);
if ($this->size() < $ptr) {
return false;
}
// @phpstan-ignore-next-line
$this->data[intdiv($ptr, self::PAGE_SIZE)][$ptr % self::PAGE_SIZE] = chr($c);
return true;
}
/**
* @param S32 $c
* @return bool
*/
public function storeI32(int $ptr, int $c, int $n): bool
{
if ($this->size() < $ptr + $n) {
return false;
}
$buf = pack(match ($n) {
1 => 'c',
2 => 's',
4 => 'l',
default => throw new \LogicException('Invalid byte length'),
}, $c);
for ($i = 0; $i < $n; $i++) {
$this->storeByte($ptr + $i, ord($buf[$i]));
}
return true;
}
/**
* @param S64 $c
* @return bool
*/
public function storeI64(int $ptr, int $c, int $n): bool
{
if ($this->size() < $ptr + $n) {
return false;
}
$buf = pack(match ($n) {
1 => 'c',
2 => 's',
4 => 'l',
8 => 'q',
default => throw new \LogicException('Invalid byte length'),
}, $c);
for ($i = 0; $i < $n; $i++) {
$this->storeByte($ptr + $i, ord($buf[$i]));
}
return true;
}
/**
* @param F32 $c
* @return bool
*/
public function storeF32(int $ptr, float $c): bool
{
if ($this->size() < $ptr + 4) {
return false;
}
$buf = pack('f', $c);
for ($i = 0; $i < 4; $i++) {
$this->storeByte($ptr + $i, ord($buf[$i]));
}
return true;
}
/**
* @param F64 $c
* @return bool
*/
public function storeF64(int $ptr, float $c): bool
{
if ($this->size() < $ptr + 8) {
return false;
}
$buf = pack('d', $c);
for ($i = 0; $i < 8; $i++) {
$this->storeByte($ptr + $i, ord($buf[$i]));
}
return true;
}
private function sliceNBytes(int $ptr, int $len): ?string
{
if ($this->size() < $ptr + $len) {
return null;
}
$buf = '';
$idx = $ptr % self::PAGE_SIZE;
for ($p = intdiv($ptr, self::PAGE_SIZE); ; $p++) {
$page = $this->data[$p];
$readLen = min(self::PAGE_SIZE - $idx, $len);
$buf .= substr($page, $idx, $readLen);
$len -= $readLen;
if ($len === 0) {
break;
}
$idx = 0;
}
return $buf;
}
}
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