Exemplo n.º 1
0
 /**
  * Pre-compiles the method making compilation pass data (static inference, local-context-pass) available to other methods
  *
  * @param CompilationContext $compilationContext
  * @return null
  * @throws CompilerException
  */
 public function preCompile(CompilationContext $compilationContext)
 {
     $localContext = null;
     $typeInference = null;
     $callGathererPass = null;
     if (is_object($this->statements)) {
         $compilationContext->currentMethod = $this;
         /**
          * This pass checks for zval variables than can be potentially
          * used without allocating memory and track it
          * these variables are stored in the stack
          */
         if ($compilationContext->config->get('local-context-pass', 'optimizations')) {
             $localContext = new LocalContextPass();
             $localContext->pass($this->statements);
         }
         /**
          * This pass tries to infer types for dynamic variables
          * replacing them by low level variables
          */
         if ($compilationContext->config->get('static-type-inference', 'optimizations')) {
             $typeInference = new StaticTypeInference();
             $typeInference->pass($this->statements);
             if ($compilationContext->config->get('static-type-inference-second-pass', 'optimizations')) {
                 $typeInference->reduce();
                 $typeInference->pass($this->statements);
             }
         }
         /**
          * This pass counts how many times a specific
          */
         if ($compilationContext->config->get('call-gatherer-pass', 'optimizations')) {
             $callGathererPass = new CallGathererPass($compilationContext);
             $callGathererPass->pass($this->statements);
         }
     }
     $this->localContext = $localContext;
     $this->typeInference = $typeInference;
     $this->callGathererPass = $callGathererPass;
 }
Exemplo n.º 2
0
 /**
  * Compiles the method
  *
  * @param CompilationContext $compilationContext
  * @return null
  * @throws CompilerException
  */
 public function compile(CompilationContext $compilationContext)
 {
     /**
      * Set the method currently being compiled
      */
     $compilationContext->currentMethod = $this;
     if (is_object($this->_statements)) {
         /**
          * This pass checks for zval variables than can be potentially
          * used without allocating memory and track it
          * these variables are stored in the stack
          */
         if ($compilationContext->config->get('local-context-pass', 'optimizations')) {
             $localContext = new LocalContextPass();
             $localContext->pass($this->_statements);
         } else {
             $localContext = null;
         }
         /**
          * This pass tries to infer types for dynamic variables
          * replacing them by low level variables
          */
         if ($compilationContext->config->get('static-type-inference', 'optimizations')) {
             $typeInference = new StaticTypeInference();
             $typeInference->pass($this->_statements);
             if ($compilationContext->config->get('static-type-inference-second-pass', 'optimizations')) {
                 $typeInference->reduce();
                 $typeInference->pass($this->_statements);
             }
         } else {
             $typeInference = null;
         }
         /**
          * This pass counts how many times a specific
          */
         if ($compilationContext->config->get('call-gatherer-pass', 'optimizations')) {
             $callGathererPass = new CallGathererPass($compilationContext);
             $callGathererPass->pass($this->_statements);
         } else {
             $callGathererPass = null;
         }
     } else {
         $localContext = null;
         $typeInference = null;
         $callGathererPass = null;
     }
     /**
      * Every method has its own symbol table
      */
     $symbolTable = new SymbolTable($compilationContext);
     if ($localContext) {
         $symbolTable->setLocalContext($localContext);
     }
     /**
      * Parameters has an additional extra mutation
      */
     $parameters = $this->_parameters;
     if ($localContext) {
         if (is_object($parameters)) {
             foreach ($parameters->getParameters() as $parameter) {
                 $localContext->increaseMutations($parameter['name']);
             }
         }
     }
     /**
      * Initialization of parameters happens in a fictitious external branch
      */
     $branch = new Branch();
     $branch->setType(Branch::TYPE_EXTERNAL);
     /**
      * BranchManager helps to create graphs of conditional/loop/root/jump branches
      */
     $branchManager = new BranchManager();
     $branchManager->addBranch($branch);
     /**
      * Cache Manager manages both function and method call caches
      */
     $cacheManager = new CacheManager();
     $cacheManager->setGatherer($callGathererPass);
     $compilationContext->branchManager = $branchManager;
     $compilationContext->cacheManager = $cacheManager;
     $compilationContext->typeInference = $typeInference;
     $compilationContext->symbolTable = $symbolTable;
     $oldCodePrinter = $compilationContext->codePrinter;
     /**
      * Change the code printer to a single method instance
      */
     $codePrinter = new CodePrinter();
     $compilationContext->codePrinter = $codePrinter;
     /**
      * Set an empty function cache
      */
     $compilationContext->functionCache = null;
     /**
      * Reset try/catch and loop counter
      */
     $compilationContext->insideCycle = 0;
     $compilationContext->insideTryCatch = 0;
     if (is_object($parameters)) {
         /**
          * Round 1. Create variables in parameters in the symbol table
          */
         $classCastChecks = array();
         foreach ($parameters->getParameters() as $parameter) {
             /**
              * Change dynamic variables to low level types
              */
             if ($typeInference) {
                 if (isset($parameter['data-type'])) {
                     if ($parameter['data-type'] == 'variable') {
                         $type = $typeInference->getInferedType($parameter['name']);
                         if (is_string($type)) {
                             /* promote polymorphic parameters to low level types */
                         }
                     }
                 } else {
                     $type = $typeInference->getInferedType($parameter['name']);
                     if (is_string($type)) {
                         /* promote polymorphic parameters to low level types */
                     }
                 }
             }
             $symbolParam = null;
             if (isset($parameter['data-type'])) {
                 switch ($parameter['data-type']) {
                     case 'object':
                     case 'callable':
                     case 'resource':
                     case 'variable':
                         $symbol = $symbolTable->addVariable($parameter['data-type'], $parameter['name'], $compilationContext);
                         break;
                     default:
                         $symbol = $symbolTable->addVariable($parameter['data-type'], $parameter['name'], $compilationContext);
                         $symbolParam = $symbolTable->addVariable('variable', $parameter['name'] . '_param', $compilationContext);
                         if ($parameter['data-type'] == 'string' || $parameter['data-type'] == 'array') {
                             $symbol->setMustInitNull(true);
                         }
                         break;
                 }
             } else {
                 $symbol = $symbolTable->addVariable('variable', $parameter['name'], $compilationContext);
             }
             /**
              * Some parameters can be read-only
              */
             if (isset($parameter['const']) && $parameter['const']) {
                 $symbol->setReadOnly(true);
                 if (is_object($symbolParam)) {
                     $symbolParam->setReadOnly(true);
                 }
             }
             if (is_object($symbolParam)) {
                 /**
                  * Parameters are marked as 'external'
                  */
                 $symbolParam->setIsExternal(true);
                 /**
                  * Assuming they're initialized
                  */
                 $symbolParam->setIsInitialized(true, $compilationContext, $parameter);
                 /**
                  * Initialize auxiliar parameter zvals to null
                  */
                 $symbolParam->setMustInitNull(true);
                 /**
                  * Increase uses
                  */
                 $symbolParam->increaseUses();
             } else {
                 if (isset($parameter['default'])) {
                     if (isset($parameter['data-type'])) {
                         if ($parameter['data-type'] == 'variable') {
                             $symbol->setMustInitNull(true);
                         }
                     } else {
                         $symbol->setMustInitNull(true);
                     }
                 }
             }
             /**
              * Original node where the variable was declared
              */
             $symbol->setOriginal($parameter);
             /**
              * Parameters are marked as 'external'
              */
             $symbol->setIsExternal(true);
             /**
              * Assuming they're initialized
              */
             $symbol->setIsInitialized(true, $compilationContext, $parameter);
             /**
              * Variables with class/type must be objects across the execution
              */
             if (isset($parameter['cast'])) {
                 $symbol->setDynamicTypes('object');
                 $symbol->setClassTypes($compilationContext->getFullName($parameter['cast']['value']));
                 $classCastChecks[] = array($symbol, $parameter);
             } else {
                 if (isset($parameter['data-type'])) {
                     if ($parameter['data-type'] == 'variable') {
                         $symbol->setDynamicTypes('undefined');
                     }
                 } else {
                     $symbol->setDynamicTypes('undefined');
                 }
             }
         }
         $compilationContext->codePrinter->increaseLevel();
         /**
          * Checks that a class-hinted variable meets its declaration
          */
         foreach ($classCastChecks as $classCastCheck) {
             foreach ($classCastCheck[0]->getClassTypes() as $className) {
                 /**
                  * If the parameter is nullable check it must pass the 'instanceof' validation
                  */
                 if (!isset($classCastCheck[1]['default'])) {
                     $evalExpr = new UnaryOperatorBuilder('not', new BinaryOperatorBuilder('instanceof', new VariableBuilder($classCastCheck[0]->getName()), new VariableBuilder('\\' . $className)));
                 } else {
                     $evalExpr = new BinaryOperatorBuilder('and', new BinaryOperatorBuilder('not-equals', new TypeOfOperatorBuilder(new VariableBuilder($classCastCheck[0]->getName())), new LiteralBuilder("string", "null")), new UnaryOperatorBuilder('not', new BinaryOperatorBuilder('instanceof', new VariableBuilder($classCastCheck[0]->getName()), new VariableBuilder('\\' . $className))));
                 }
                 $ifCheck = new IfStatementBuilder($evalExpr, new StatementsBlockBuilder(array(new ThrowStatementBuilder(new NewInstanceOperatorBuilder('\\InvalidArgumentException', array(new ParameterBuilder(new LiteralBuilder("string", "Parameter '" . $classCastCheck[0]->getName() . "' must be an instance of '" . Utils::escapeClassName($className) . "'"))))))));
                 $ifStatement = new IfStatement($ifCheck->get());
                 $ifStatement->compile($compilationContext);
             }
         }
         $compilationContext->codePrinter->decreaseLevel();
     }
     /**
      * Compile the block of statements if any
      */
     if (is_object($this->_statements)) {
         if ($this->hasModifier('static')) {
             $compilationContext->staticContext = true;
         } else {
             $compilationContext->staticContext = false;
         }
         /**
          * Compile the statements block as a 'root' branch
          */
         $this->_statements->compile($compilationContext, false, Branch::TYPE_ROOT);
     }
     /**
      * Initialize default values in dynamic variables
      */
     $initVarCode = "";
     foreach ($symbolTable->getVariables() as $variable) {
         /**
          * Initialize 'dynamic' variables with default values
          */
         if ($variable->getType() == 'variable') {
             if ($variable->getNumberUses() > 0) {
                 if ($variable->getName() != 'this_ptr' && $variable->getName() != 'return_value' && $variable->getName() != 'return_value_ptr') {
                     $defaultValue = $variable->getDefaultInitValue();
                     if (is_array($defaultValue)) {
                         $symbolTable->mustGrownStack(true);
                         switch ($defaultValue['type']) {
                             case 'int':
                             case 'uint':
                             case 'long':
                             case 'char':
                             case 'uchar':
                                 $initVarCode .= "\t" . 'ZEPHIR_INIT_VAR(' . $variable->getName() . ');' . PHP_EOL;
                                 $initVarCode .= "\t" . 'ZVAL_LONG(' . $variable->getName() . ', ' . $defaultValue['value'] . ');' . PHP_EOL;
                                 break;
                             case 'null':
                                 $initVarCode .= "\t" . 'ZEPHIR_INIT_VAR(' . $variable->getName() . ');' . PHP_EOL;
                                 $initVarCode .= "\t" . 'ZVAL_NULL(' . $variable->getName() . ');' . PHP_EOL;
                                 break;
                             case 'double':
                                 $initVarCode .= "\t" . 'ZEPHIR_INIT_VAR(' . $variable->getName() . ');' . PHP_EOL;
                                 $initVarCode .= "\t" . 'ZVAL_DOUBLE(' . $variable->getName() . ', ' . $defaultValue['value'] . ');' . PHP_EOL;
                                 break;
                             case 'string':
                                 $initVarCode .= "\t" . 'ZEPHIR_INIT_VAR(' . $variable->getName() . ');' . PHP_EOL;
                                 $initVarCode .= "\t" . 'ZVAL_STRING(' . $variable->getName() . ', "' . Utils::addSlashes($defaultValue['value'], true) . '", 1);' . PHP_EOL;
                                 break;
                             case 'array':
                             case 'empty-array':
                                 $initVarCode .= "\t" . 'ZEPHIR_INIT_VAR(' . $variable->getName() . ');' . PHP_EOL;
                                 $initVarCode .= "\t" . 'array_init(' . $variable->getName() . ');' . PHP_EOL;
                                 break;
                             default:
                                 throw new CompilerException('Invalid default type: ' . $defaultValue['type'] . ' for data type: ' . $variable->getType(), $variable->getOriginal());
                         }
                     }
                 }
             }
             continue;
         }
         /**
          * Initialize 'string' variables with default values
          */
         if ($variable->getType() == 'string') {
             if ($variable->getNumberUses() > 0) {
                 $defaultValue = $variable->getDefaultInitValue();
                 if (is_array($defaultValue)) {
                     $symbolTable->mustGrownStack(true);
                     switch ($defaultValue['type']) {
                         case 'string':
                             $initVarCode .= "\t" . 'ZEPHIR_INIT_VAR(' . $variable->getName() . ');' . PHP_EOL;
                             $initVarCode .= "\t" . 'ZVAL_STRING(' . $variable->getName() . ', "' . Utils::addSlashes($defaultValue['value'], true) . '", 1);' . PHP_EOL;
                             break;
                         case 'null':
                             $initVarCode .= "\t" . 'ZEPHIR_INIT_VAR(' . $variable->getName() . ');' . PHP_EOL;
                             $initVarCode .= "\t" . 'ZVAL_EMPTY_STRING(' . $variable->getName() . ');' . PHP_EOL;
                             break;
                         default:
                             throw new CompilerException('Invalid default type: ' . $defaultValue['type'] . ' for data type: ' . $variable->getType(), $variable->getOriginal());
                     }
                 }
             }
             continue;
         }
         /**
          * Initialize 'array' variables with default values
          */
         if ($variable->getType() == 'array') {
             if ($variable->getNumberUses() > 0) {
                 $defaultValue = $variable->getDefaultInitValue();
                 if (is_array($defaultValue)) {
                     $symbolTable->mustGrownStack(true);
                     switch ($defaultValue['type']) {
                         case 'null':
                             $initVarCode .= "\t" . 'ZEPHIR_INIT_VAR(' . $variable->getName() . ');' . PHP_EOL;
                             $initVarCode .= "\t" . 'ZVAL_NULL(' . $variable->getName() . ');' . PHP_EOL;
                             break;
                         case 'array':
                         case 'empty-array':
                             $initVarCode .= "\t" . 'ZEPHIR_INIT_VAR(' . $variable->getName() . ');' . PHP_EOL;
                             $initVarCode .= "\t" . 'array_init(' . $variable->getName() . ');' . PHP_EOL;
                             break;
                         default:
                             throw new CompilerException('Invalid default type: ' . $defaultValue['type'] . ' for data type: ' . $variable->getType(), $variable->getOriginal());
                     }
                 }
             }
         }
     }
     /**
      * Fetch parameters from vm-top
      */
     $initCode = "";
     $code = "";
     if (is_object($parameters)) {
         /**
          * Round 2. Fetch the parameters in the method
          */
         $params = array();
         $requiredParams = array();
         $optionalParams = array();
         $numberRequiredParams = 0;
         $numberOptionalParams = 0;
         foreach ($parameters->getParameters() as $parameter) {
             if (isset($parameter['data-type'])) {
                 $dataType = $parameter['data-type'];
             } else {
                 $dataType = 'variable';
             }
             switch ($dataType) {
                 case 'object':
                 case 'callable':
                 case 'resource':
                 case 'variable':
                     $params[] = '&' . $parameter['name'];
                     break;
                 default:
                     $params[] = '&' . $parameter['name'] . '_param';
                     break;
             }
             if (isset($parameter['default'])) {
                 $optionalParams[] = $parameter;
                 $numberOptionalParams++;
             } else {
                 $requiredParams[] = $parameter;
                 $numberRequiredParams++;
             }
         }
         /**
          * Pass the write detector to the method statement block to check if the parameter
          * variable is modified so as do the proper separation
          */
         $parametersToSeparate = array();
         if (is_object($this->_statements)) {
             /**
              * If local context is not available
              */
             if (!$localContext) {
                 $writeDetector = new WriteDetector();
             }
             foreach ($parameters->getParameters() as $parameter) {
                 if (isset($parameter['data-type'])) {
                     $dataType = $parameter['data-type'];
                 } else {
                     $dataType = 'variable';
                 }
                 switch ($dataType) {
                     case 'variable':
                     case 'string':
                     case 'array':
                     case 'resource':
                     case 'object':
                     case 'callable':
                         $name = $parameter['name'];
                         if (!$localContext) {
                             if ($writeDetector->detect($name, $this->_statements->getStatements())) {
                                 $parametersToSeparate[$name] = true;
                             }
                         } else {
                             if ($localContext->getNumberOfMutations($name) > 1) {
                                 $parametersToSeparate[$name] = true;
                             }
                         }
                         break;
                 }
             }
         }
         /**
          * Initialize required parameters
          */
         foreach ($requiredParams as $parameter) {
             if (isset($parameter['mandatory'])) {
                 $mandatory = $parameter['mandatory'];
             } else {
                 $mandatory = 0;
             }
             if (isset($parameter['data-type'])) {
                 $dataType = $parameter['data-type'];
             } else {
                 $dataType = 'variable';
             }
             if ($dataType != 'variable') {
                 /**
                  * Assign value from zval to low level type
                  */
                 if ($mandatory) {
                     $initCode .= $this->checkStrictType($parameter, $compilationContext);
                 } else {
                     $initCode .= $this->assignZvalValue($parameter, $compilationContext);
                 }
             }
             switch ($dataType) {
                 case 'variable':
                 case 'string':
                 case 'array':
                 case 'resource':
                 case 'object':
                 case 'callable':
                     if (isset($parametersToSeparate[$parameter['name']])) {
                         $symbolTable->mustGrownStack(true);
                         $initCode .= "\t" . "ZEPHIR_SEPARATE_PARAM(" . $parameter['name'] . ");" . PHP_EOL;
                     }
                     break;
             }
         }
         /**
          * Initialize optional parameters
          */
         foreach ($optionalParams as $parameter) {
             if (isset($parameter['mandatory'])) {
                 $mandatory = $parameter['mandatory'];
             } else {
                 $mandatory = 0;
             }
             if (isset($parameter['data-type'])) {
                 $dataType = $parameter['data-type'];
             } else {
                 $dataType = 'variable';
             }
             switch ($dataType) {
                 case 'object':
                 case 'callable':
                 case 'resource':
                 case 'variable':
                     $name = $parameter['name'];
                     break;
                 default:
                     $name = $parameter['name'] . '_param';
                     break;
             }
             /**
              * Assign the default value according to the variable's type
              */
             $initCode .= "\t" . 'if (!' . $name . ') {' . PHP_EOL;
             $initCode .= $this->assignDefaultValue($parameter, $compilationContext);
             if (isset($parametersToSeparate[$name]) || $dataType != 'variable') {
                 $initCode .= "\t" . '} else {' . PHP_EOL;
                 if (isset($parametersToSeparate[$name])) {
                     $initCode .= "\t\t" . "ZEPHIR_SEPARATE_PARAM(" . $name . ");" . PHP_EOL;
                 } else {
                     if ($mandatory) {
                         $initCode .= $this->checkStrictType($parameter, $compilationContext, $mandatory);
                     } else {
                         $initCode .= "\t" . $this->assignZvalValue($parameter, $compilationContext);
                     }
                 }
             }
             $initCode .= "\t" . '}' . PHP_EOL;
         }
         /**
          * Fetch the parameters to zval pointers
          */
         $codePrinter->preOutputBlankLine();
         $compilationContext->headersManager->add('kernel/memory');
         if ($symbolTable->getMustGrownStack()) {
             $code .= "\t" . 'zephir_fetch_params(1, ' . $numberRequiredParams . ', ' . $numberOptionalParams . ', ' . join(', ', $params) . ');' . PHP_EOL;
         } else {
             $code .= "\t" . 'zephir_fetch_params(0, ' . $numberRequiredParams . ', ' . $numberOptionalParams . ', ' . join(', ', $params) . ');' . PHP_EOL;
         }
         $code .= PHP_EOL;
     }
     $code .= $initCode . $initVarCode;
     $codePrinter->preOutput($code);
     /**
      * Grow the stack if needed
      */
     if ($symbolTable->getMustGrownStack()) {
         $compilationContext->headersManager->add('kernel/memory');
         $codePrinter->preOutput("\t" . 'ZEPHIR_MM_GROW();');
     }
     /**
      * Check if there are unused variables
      */
     $usedVariables = array();
     $completeName = $compilationContext->classDefinition->getCompleteName();
     foreach ($symbolTable->getVariables() as $variable) {
         if ($variable->getNumberUses() <= 0) {
             if ($variable->isExternal() == false) {
                 $compilationContext->logger->warning('Variable "' . $variable->getName() . '" declared but not used in ' . $completeName . '::' . $this->getName(), "unused-variable", $variable->getOriginal());
                 continue;
             }
             $compilationContext->logger->warning('Variable "' . $variable->getName() . '" declared but not used in ' . $completeName . '::' . $this->getName(), "unused-variable-external", $variable->getOriginal());
         }
         if ($variable->getName() != 'this_ptr' && $variable->getName() != 'return_value' && $variable->getName() != 'return_value_ptr') {
             $type = $variable->getType();
             if (!isset($usedVariables[$type])) {
                 $usedVariables[$type] = array();
             }
             $usedVariables[$type][] = $variable;
         }
     }
     if (count($usedVariables)) {
         $codePrinter->preOutputBlankLine();
     }
     /**
      * Generate the variable definition for variables used
      */
     foreach ($usedVariables as $type => $variables) {
         $pointer = null;
         switch ($type) {
             case 'int':
                 $code = 'int ';
                 break;
             case 'uint':
                 $code = 'unsigned int ';
                 break;
             case 'char':
                 $code = 'char ';
                 break;
             case 'uchar':
                 $code = 'unsigned char ';
                 break;
             case 'long':
                 $code = 'long ';
                 break;
             case 'ulong':
                 $code = 'unsigned long ';
                 break;
             case 'bool':
                 $code = 'zend_bool ';
                 break;
             case 'double':
                 $code = 'double ';
                 break;
             case 'string':
             case 'variable':
             case 'array':
             case 'null':
                 $pointer = '*';
                 $code = 'zval ';
                 break;
             case 'HashTable':
                 $pointer = '*';
                 $code = 'HashTable ';
                 break;
             case 'HashPosition':
                 $code = 'HashPosition ';
                 break;
             case 'zend_class_entry':
                 $pointer = '*';
                 $code = 'zend_class_entry ';
                 break;
             case 'zend_function':
                 $pointer = '*';
                 $code = 'zend_function ';
                 break;
             case 'zend_object_iterator':
                 $pointer = '*';
                 $code = 'zend_object_iterator ';
                 break;
             case 'zend_property_info':
                 $pointer = '*';
                 $code = 'zend_property_info ';
                 break;
             case 'zephir_fcall_cache_entry':
                 $pointer = '*';
                 $code = 'zephir_fcall_cache_entry ';
                 break;
             case 'static_zephir_fcall_cache_entry':
                 $pointer = '*';
                 $code = 'zephir_nts_static zephir_fcall_cache_entry ';
                 break;
             default:
                 throw new CompilerException("Unsupported type in declare: " . $type);
         }
         $groupVariables = array();
         $defaultValues = array();
         /**
          * @var $variables Variable[]
          */
         foreach ($variables as $variable) {
             if (($type == 'variable' || $type == 'string' || $type == 'array' || $type == 'resource' || $type == 'callable' || $type == 'object') && $variable->mustInitNull()) {
                 if ($variable->isLocalOnly()) {
                     $groupVariables[] = $variable->getName() . ' = zval_used_for_init';
                 } else {
                     if ($variable->isDoublePointer()) {
                         $groupVariables[] = $pointer . $pointer . $variable->getName() . ' = NULL';
                     } else {
                         $groupVariables[] = $pointer . $variable->getName() . ' = NULL';
                     }
                 }
             } else {
                 if ($variable->isLocalOnly()) {
                     $groupVariables[] = $variable->getName();
                 } else {
                     if ($variable->isDoublePointer()) {
                         if ($variable->mustInitNull()) {
                             $groupVariables[] = $pointer . $pointer . $variable->getName() . ' = NULL';
                         } else {
                             $groupVariables[] = $pointer . $pointer . $variable->getName();
                         }
                     } else {
                         $defaultValue = $variable->getDefaultInitValue();
                         if ($defaultValue !== null) {
                             switch ($type) {
                                 case 'variable':
                                 case 'string':
                                 case 'array':
                                 case 'resource':
                                 case 'callable':
                                 case 'object':
                                     $groupVariables[] = $pointer . $variable->getName();
                                     break;
                                 default:
                                     $groupVariables[] = $pointer . $variable->getName() . ' = ' . $defaultValue;
                                     break;
                             }
                         } else {
                             if ($variable->mustInitNull() && $pointer) {
                                 $groupVariables[] = $pointer . $variable->getName() . ' = NULL';
                             } else {
                                 $groupVariables[] = $pointer . $variable->getName();
                             }
                         }
                     }
                 }
             }
         }
         $codePrinter->preOutput("\t" . $code . join(', ', $groupVariables) . ';');
     }
     /**
      * Finalize the method compilation
      */
     if (is_object($this->_statements)) {
         /**
          * If the last statement is not a 'return' or 'throw' we need to
          * restore the memory stack if needed
          */
         $lastType = $this->_statements->getLastStatementType();
         if ($lastType != 'return' && $lastType != 'throw' && !$this->hasChildReturnStatementType($this->_statements->getLastStatement())) {
             if ($symbolTable->getMustGrownStack()) {
                 $compilationContext->headersManager->add('kernel/memory');
                 $codePrinter->output("\t" . 'ZEPHIR_MM_RESTORE();');
             }
             /**
              * If a method has return-type hints we need to ensure the last statement is a 'return' statement
              */
             if ($this->hasReturnTypes()) {
                 throw new CompilerException('Reached end of the method without returning a valid type specified in the return-type hints', $this->_expression['return-type']);
             }
         }
     }
     /**
      * Remove macros that restore the memory stack if it wasn't used
      */
     $code = $this->removeMemoryStackReferences($symbolTable, $codePrinter->getOutput());
     /**
      * Restore the compilation context
      */
     $oldCodePrinter->output($code);
     $compilationContext->codePrinter = $oldCodePrinter;
     $compilationContext->branchManager = null;
     $compilationContext->cacheManager = null;
     $compilationContext->typeInference = null;
     $codePrinter->clear();
     return null;
 }