301 lines
13 KiB
PHP
301 lines
13 KiB
PHP
<?php
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/*
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* This file is part of the Symfony package.
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*
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* (c) Fabien Potencier <fabien@symfony.com>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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namespace Symfony\Component\VarDumper\Cloner;
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/**
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* @author Nicolas Grekas <p@tchwork.com>
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*/
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class VarCloner extends AbstractCloner
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{
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private static $hashMask = 0;
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private static $hashOffset = 0;
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/**
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* {@inheritdoc}
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*/
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protected function doClone($var)
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{
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$useExt = $this->useExt;
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$i = 0; // Current iteration position in $queue
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$len = 1; // Length of $queue
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$pos = 0; // Number of cloned items past the first level
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$refs = 0; // Hard references counter
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$queue = array(array($var)); // This breadth-first queue is the return value
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$arrayRefs = array(); // Map of queue indexes to stub array objects
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$hardRefs = array(); // Map of original zval hashes to stub objects
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$objRefs = array(); // Map of original object handles to their stub object couterpart
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$resRefs = array(); // Map of original resource handles to their stub object couterpart
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$values = array(); // Map of stub objects' hashes to original values
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$maxItems = $this->maxItems;
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$maxString = $this->maxString;
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$cookie = (object) array(); // Unique object used to detect hard references
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$gid = uniqid(mt_rand(), true); // Unique string used to detect the special $GLOBALS variable
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$a = null; // Array cast for nested structures
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$stub = null; // Stub capturing the main properties of an original item value
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// or null if the original value is used directly
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$zval = array( // Main properties of the current value
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'type' => null,
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'zval_isref' => null,
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'zval_hash' => null,
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'array_count' => null,
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'object_class' => null,
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'object_handle' => null,
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'resource_type' => null,
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);
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if (!self::$hashMask) {
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self::initHashMask();
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}
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$hashMask = self::$hashMask;
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$hashOffset = self::$hashOffset;
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for ($i = 0; $i < $len; ++$i) {
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$indexed = true; // Whether the currently iterated array is numerically indexed or not
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$j = -1; // Position in the currently iterated array
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$step = $queue[$i]; // Copy of the currently iterated array used for hard references detection
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foreach ($step as $k => $v) {
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// $k is the original key
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// $v is the original value or a stub object in case of hard references
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if ($indexed && $k !== ++$j) {
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$indexed = false;
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}
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if ($useExt) {
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$zval = symfony_zval_info($k, $step);
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} else {
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$step[$k] = $cookie;
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if ($zval['zval_isref'] = $queue[$i][$k] === $cookie) {
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$zval['zval_hash'] = $v instanceof Stub ? spl_object_hash($v) : null;
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}
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$zval['type'] = gettype($v);
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}
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if ($zval['zval_isref']) {
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$queue[$i][$k] =& $stub; // Break hard references to make $queue completely
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unset($stub); // independent from the original structure
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if (isset($hardRefs[$zval['zval_hash']])) {
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$queue[$i][$k] = $useExt ? ($v = $hardRefs[$zval['zval_hash']]) : ($step[$k] = $v);
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if ($v->value instanceof Stub && (Stub::TYPE_OBJECT === $v->value->type || Stub::TYPE_RESOURCE === $v->value->type)) {
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++$v->value->refCount;
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}
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++$v->refCount;
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continue;
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}
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}
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// Create $stub when the original value $v can not be used directly
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// If $v is a nested structure, put that structure in array $a
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switch ($zval['type']) {
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case 'string':
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if (isset($v[0]) && !preg_match('//u', $v)) {
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$stub = new Stub();
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$stub->type = Stub::TYPE_STRING;
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$stub->class = Stub::STRING_BINARY;
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if (0 <= $maxString && 0 < $cut = strlen($v) - $maxString) {
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$stub->cut = $cut;
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$stub->value = substr($v, 0, -$cut);
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} else {
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$stub->value = $v;
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}
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} elseif (0 <= $maxString && isset($v[1 + ($maxString >> 2)]) && 0 < $cut = iconv_strlen($v, 'UTF-8') - $maxString) {
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$stub = new Stub();
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$stub->type = Stub::TYPE_STRING;
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$stub->class = Stub::STRING_UTF8;
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$stub->cut = $cut;
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$stub->value = iconv_substr($v, 0, $maxString, 'UTF-8');
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}
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break;
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case 'integer':
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break;
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case 'array':
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if ($v) {
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$stub = $arrayRefs[$len] = new Stub();
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$stub->type = Stub::TYPE_ARRAY;
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$stub->class = Stub::ARRAY_ASSOC;
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$stub->value = $zval['array_count'] ?: count($v);
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$a = $v;
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// Copies of $GLOBALS have very strange behavior,
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// let's detect them with some black magic
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$a[$gid] = true;
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// Happens with copies of $GLOBALS
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if (isset($v[$gid])) {
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unset($v[$gid]);
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$a = array();
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foreach ($v as $gk => &$gv) {
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$a[$gk] =& $gv;
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}
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} else {
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$a = $v;
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}
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}
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break;
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case 'object':
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if (empty($objRefs[$h = $zval['object_handle'] ?: ($hashMask ^ hexdec(substr(spl_object_hash($v), $hashOffset, PHP_INT_SIZE)))])) {
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$stub = new Stub();
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$stub->type = Stub::TYPE_OBJECT;
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$stub->class = $zval['object_class'] ?: get_class($v);
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$stub->value = $v;
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$stub->handle = $h;
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$a = $this->castObject($stub, 0 < $i);
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if ($v !== $stub->value) {
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if (Stub::TYPE_OBJECT !== $stub->type) {
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break;
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}
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if ($useExt) {
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$zval['type'] = $stub->value;
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$zval = symfony_zval_info('type', $zval);
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$h = $zval['object_handle'];
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} else {
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$h = $hashMask ^ hexdec(substr(spl_object_hash($stub->value), $hashOffset, PHP_INT_SIZE));
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}
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$stub->handle = $h;
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}
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$stub->value = null;
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if (0 <= $maxItems && $maxItems <= $pos) {
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$stub->cut = count($a);
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$a = null;
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}
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}
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if (empty($objRefs[$h])) {
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$objRefs[$h] = $stub;
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} else {
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$stub = $objRefs[$h];
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++$stub->refCount;
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$a = null;
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}
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break;
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case 'resource':
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case 'unknown type':
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if (empty($resRefs[$h = (int) $v])) {
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$stub = new Stub();
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$stub->type = Stub::TYPE_RESOURCE;
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$stub->class = $zval['resource_type'] ?: get_resource_type($v);
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$stub->value = $v;
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$stub->handle = $h;
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$a = $this->castResource($stub, 0 < $i);
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$stub->value = null;
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if (0 <= $maxItems && $maxItems <= $pos) {
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$stub->cut = count($a);
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$a = null;
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}
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}
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if (empty($resRefs[$h])) {
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$resRefs[$h] = $stub;
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} else {
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$stub = $resRefs[$h];
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++$stub->refCount;
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$a = null;
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}
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break;
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}
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if (isset($stub)) {
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if ($zval['zval_isref']) {
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if ($useExt) {
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$queue[$i][$k] = $hardRefs[$zval['zval_hash']] = $v = new Stub();
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$v->value = $stub;
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} else {
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$step[$k] = new Stub();
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$step[$k]->value = $stub;
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$h = spl_object_hash($step[$k]);
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$queue[$i][$k] = $hardRefs[$h] =& $step[$k];
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$values[$h] = $v;
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}
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$queue[$i][$k]->handle = ++$refs;
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} else {
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$queue[$i][$k] = $stub;
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}
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if ($a) {
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if ($i && 0 <= $maxItems) {
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$k = count($a);
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if ($pos < $maxItems) {
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if ($maxItems < $pos += $k) {
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$a = array_slice($a, 0, $maxItems - $pos);
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if ($stub->cut >= 0) {
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$stub->cut += $pos - $maxItems;
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}
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}
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} else {
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if ($stub->cut >= 0) {
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$stub->cut += $k;
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}
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$stub = $a = null;
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unset($arrayRefs[$len]);
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continue;
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}
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}
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$queue[$len] = $a;
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$stub->position = $len++;
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}
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$stub = $a = null;
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} elseif ($zval['zval_isref']) {
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if ($useExt) {
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$queue[$i][$k] = $hardRefs[$zval['zval_hash']] = new Stub();
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$queue[$i][$k]->value = $v;
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} else {
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$step[$k] = $queue[$i][$k] = new Stub();
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$step[$k]->value = $v;
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$h = spl_object_hash($step[$k]);
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$hardRefs[$h] =& $step[$k];
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$values[$h] = $v;
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}
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$queue[$i][$k]->handle = ++$refs;
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}
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}
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if (isset($arrayRefs[$i])) {
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if ($indexed) {
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$arrayRefs[$i]->class = Stub::ARRAY_INDEXED;
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}
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unset($arrayRefs[$i]);
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}
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}
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foreach ($values as $h => $v) {
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$hardRefs[$h] = $v;
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}
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return $queue;
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}
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private static function initHashMask()
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{
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$obj = (object) array();
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self::$hashOffset = 16 - PHP_INT_SIZE;
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self::$hashMask = -1;
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if (defined('HHVM_VERSION')) {
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self::$hashOffset += 16;
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} else {
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// check if we are nested in an output buffering handler to prevent a fatal error with ob_start() below
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$obFuncs = array('ob_clean', 'ob_end_clean', 'ob_flush', 'ob_end_flush', 'ob_get_contents', 'ob_get_flush');
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foreach (debug_backtrace(PHP_VERSION_ID >= 50400 ? DEBUG_BACKTRACE_IGNORE_ARGS : false) as $frame) {
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if (isset($frame['function'][0]) && !isset($frame['class']) && 'o' === $frame['function'][0] && in_array($frame['function'], $obFuncs)) {
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$frame['line'] = 0;
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break;
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}
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}
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if (!empty($frame['line'])) {
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ob_start();
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debug_zval_dump($obj);
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self::$hashMask = substr(ob_get_clean(), 17);
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}
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}
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self::$hashMask ^= hexdec(substr(spl_object_hash($obj), self::$hashOffset, PHP_INT_SIZE));
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}
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}
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