diff --git a/change_log.txt b/change_log.txt
index 87406797..3b1bdd07 100644
--- a/change_log.txt
+++ b/change_log.txt
@@ -1,6 +1,7 @@
  ===== 3.1.28-dev===== (xx.xx.2015)
  18.10.2015
   - optimize filepath normalization
+  - rework of template inheritance
   
  18.09.2015
   - bugfix {if $foo instanceof $bar} failed to compile if 2nd value is a variable https://github.com/smarty-php/smarty/issues/92
diff --git a/libs/sysplugins/smarty_internal_compile_block.php b/libs/sysplugins/smarty_internal_compile_block.php
index 6a3e3a30..3a19f1bd 100644
--- a/libs/sysplugins/smarty_internal_compile_block.php
+++ b/libs/sysplugins/smarty_internal_compile_block.php
@@ -13,7 +13,7 @@
  *
  * @author Uwe Tews <uwe.tews@googlemail.com>
  */
-class Smarty_Internal_Compile_Block extends Smarty_Internal_CompileBase
+class Smarty_Internal_Compile_Block extends Smarty_Internal_Compile_Shared_Inheritance
 {
     /**
      * Attribute definition: Overwrites base class.
@@ -45,7 +45,7 @@ class Smarty_Internal_Compile_Block extends Smarty_Internal_CompileBase
      * @var array
      * @see Smarty_Internal_CompileBase
      */
-    public $optional_attributes = array();
+    public $optional_attributes = array('assign');
 
     /**
      * nesting level of block tags
@@ -54,6 +54,13 @@ class Smarty_Internal_Compile_Block extends Smarty_Internal_CompileBase
      */
     public static $blockTagNestingLevel = 0;
 
+    /**
+     * Saved compiler object
+     *
+     * @var Smarty_Internal_TemplateCompilerBase
+     */
+    public $compiler = null;
+
     /**
      * Compiles code for the {block} tag
      *
@@ -65,14 +72,22 @@ class Smarty_Internal_Compile_Block extends Smarty_Internal_CompileBase
      */
     public function compile($args, Smarty_Internal_TemplateCompilerBase $compiler, $parameter)
     {
-        if ($compiler->blockTagNestingLevel == 0 && $compiler->inheritanceChild) {
+        if (!isset($compiler->_cache['blockNesting'])) {
+            $compiler->_cache['blockNesting'] = 0;
+        }
+        if ($compiler->_cache['blockNesting'] == 0) {
+            // make sure that inheritance gets initialized in template code
+            $this->registerInit($compiler);
             $this->option_flags = array('hide', 'nocache', 'append', 'prepend');
         } else {
             $this->option_flags = array('hide', 'nocache');
         }
         // check and get attributes
         $_attr = $this->getAttributes($compiler, $args);
-        $compiler->blockTagNestingLevel ++;
+        $compiler->_cache['blockNesting'] ++;
+        $compiler->_cache['blockName'][$compiler->_cache['blockNesting']] = $_attr['name'];
+        $compiler->_cache['blockParams'][$compiler->_cache['blockNesting']][0] = 'block_' . preg_replace('![^\w]+!', '_', uniqid(rand(), true));
+        $compiler->_cache['blockParams'][$compiler->_cache['blockNesting']][1] = false;
         $this->openTag($compiler, 'block', array($_attr, $compiler->nocache, $compiler->parser->current_buffer,
                                                  $compiler->template->compiled->has_nocache_code,
                                                  $compiler->template->caching));
@@ -100,15 +115,15 @@ class Smarty_Internal_Compile_Block extends Smarty_Internal_CompileBase
      */
     static function compileChildBlock(Smarty_Internal_TemplateCompilerBase $compiler, $_name = null)
     {
-        if (!$compiler->blockTagNestingLevel) {
+        if (!isset($compiler->_cache['blockNesting'])) {
             $compiler->trigger_template_error(' tag {$smarty.block.child} used outside {block} tags ',
                                               $compiler->parser->lex->taglineno);
         }
         $compiler->has_code = true;
         $compiler->suppressNocacheProcessing = true;
-        $compiler->callChildBlock[$compiler->blockTagNestingLevel] = true;
-        $_output = "<?php \n\$_smarty_tpl->_Block->callChildBlock(\$_smarty_tpl, \$block);?>";
-        return $_output;
+        $compiler->_cache['blockParams'][$compiler->_cache['blockNesting']][1] = true;
+        $output = "<?php \n\$_smarty_tpl->_inheritance->processBlock(\$_smarty_tpl, 2, {$compiler->_cache['blockName'][$compiler->_cache['blockNesting']]}, null, \$_blockParentStack);\n?>\n";
+        return $output;
     }
 
     /**
@@ -121,18 +136,14 @@ class Smarty_Internal_Compile_Block extends Smarty_Internal_CompileBase
      */
     static function compileParentBlock(Smarty_Internal_TemplateCompilerBase $compiler, $_name = null)
     {
-        if (!$compiler->inheritanceChild) {
-            $compiler->trigger_template_error(' tag {$smarty.block.parent} used in parent template ',
-                                              $compiler->parser->lex->taglineno);
-        }
-        if (!$compiler->blockTagNestingLevel) {
+        if (!isset($compiler->_cache['blockNesting'])) {
             $compiler->trigger_template_error(' tag {$smarty.block.parent} used outside {block} tags ',
                                               $compiler->parser->lex->taglineno);
         }
         $compiler->suppressNocacheProcessing = true;
         $compiler->has_code = true;
-        $_output = "<?php \n\$_smarty_tpl->_Block->callParentBlock(\$_smarty_tpl, \$block);?>";
-        return $_output;
+        $output = "<?php \n\$_smarty_tpl->_inheritance->processBlock(\$_smarty_tpl, 3, {$compiler->_cache['blockName'][$compiler->_cache['blockNesting']]}, null, \$_blockParentStack);\n?>\n";
+        return $output;
     }
 }
 
@@ -140,7 +151,7 @@ class Smarty_Internal_Compile_Block extends Smarty_Internal_CompileBase
  * Smarty Internal Plugin Compile BlockClose Class
  *
  */
-class Smarty_Internal_Compile_Blockclose extends Smarty_Internal_CompileBase
+class Smarty_Internal_Compile_Blockclose extends Smarty_Internal_Compile_Shared_Inheritance
 {
     /**
      * Compiles code for the {/block} tag
@@ -153,57 +164,83 @@ class Smarty_Internal_Compile_Blockclose extends Smarty_Internal_CompileBase
      */
     public function compile($args, Smarty_Internal_TemplateCompilerBase $compiler, $parameter)
     {
-        $this->compiler = $compiler;
         list($_attr, $_nocache, $_buffer, $_has_nocache_code, $_caching) = $this->closeTag($compiler, array('block'));
-        $_name = trim($_attr['name'], "'\"");
+        // init block parameter
+        $_block = $compiler->_cache['blockParams'][$compiler->_cache['blockNesting']];
+        unset($compiler->_cache['blockParams'][$compiler->_cache['blockNesting']]);
+        $_block[2] = $_block[3] = 0;
+        $_name =  trim($_attr['name'], "'\"");
+        $_assign = isset($_attr['assign']) ? $_attr['assign'] : null;
+        unset($_attr['assign'], $_attr['name']);
+        foreach ($_attr as $name => $stat) {
+            if ((is_bool($stat) && $stat !== false) || (!is_bool($stat) && $stat != 'false')) {
+                $_block[$name] = is_string($stat) ? trim($stat, "'\"") : $stat;
+            }
+        }
+        $_funcName = $_block[0];
+        // get compiled block code
         $_functionCode = $compiler->parser->current_buffer;
         // setup buffer for template function code
         $compiler->parser->current_buffer = new Smarty_Internal_ParseTree_Template();
 
-        $_funcNameCaching =
-        $_funcName = preg_replace('![^\w]+!', '_', "block_function_{$_name}_" . uniqid(rand(), true));
         if ($compiler->template->compiled->has_nocache_code) {
             //            $compiler->parent_compiler->template->tpl_function[$_name]['call_name_caching'] = $_funcNameCaching;
-            $_funcNameCaching .= '_nocache';
-            $output = "<?php\n\n";
+            $_block[6] = $_funcNameCaching = $_funcName . '_nocache';
+            $output = "<?php\n";
             $output .= "/* {block '{$_name}'} {$compiler->template->source->type}:{$compiler->template->source->name} */\n";
-            $output .= "function {$_funcNameCaching} (\$_smarty_tpl, \$block) {\n";
+            $output .= "function {$_funcNameCaching} (\$_smarty_tpl, \$_blockParentStack) {\n";
             $output .= "/*/%%SmartyNocache:{$compiler->template->compiled->nocache_hash}%%*/\n";
-            $output .= "\$_smarty_tpl->cached->hashes['{$compiler->template->compiled->nocache_hash}'] = true;\n?>\n";
+            $output .= "\$_smarty_tpl->cached->hashes['{$compiler->template->compiled->nocache_hash}'] = true;\n";
+            if (isset($_assign)) {
+                $output .= "ob_start();\n";
+            }
+            $output .= "?>\n";
             $compiler->parser->current_buffer->append_subtree($compiler->parser,
                                                               new Smarty_Internal_ParseTree_Tag($compiler->parser,
                                                                                                 $output));
             $compiler->parser->current_buffer->append_subtree($compiler->parser, $_functionCode);
-            $output = "<?php /*%%SmartyNocache:{$compiler->template->compiled->nocache_hash}%%*/\n";
-            $output .= "\n}\n";
+            $output = "<?php\n";
+            if (isset($_assign)) {
+                $output .= "\$_smarty_tpl->tpl_vars[{$_assign}] = new Smarty_Variable(ob_get_contents());\n";
+            }
+            $output .= "/*%%SmartyNocache:{$compiler->template->compiled->nocache_hash}%%*/\n";
+            $output .= "}\n";
             $output .= "/* {/block '{$_name}'} */\n\n";
             $output .= "?>\n";
             $compiler->parser->current_buffer->append_subtree($compiler->parser,
                                                               new Smarty_Internal_ParseTree_Tag($compiler->parser,
                                                                                                 $output));
-            $compiler->blockOrFunctionCode .= $f =
-                $compiler->parser->current_buffer->to_smarty_php($compiler->parser);
+            $compiler->blockOrFunctionCode .= $f = $compiler->parser->current_buffer->to_smarty_php($compiler->parser);
             $compiler->parser->current_buffer = new Smarty_Internal_ParseTree_Template();
+            $this->compiler = $compiler;
             $_functionCode = new Smarty_Internal_ParseTree_Tag($compiler->parser,
                                                                preg_replace_callback("/((<\?php )?echo '\/\*%%SmartyNocache:{$compiler->template->compiled->nocache_hash}%%\*\/([\S\s]*?)\/\*\/%%SmartyNocache:{$compiler->template->compiled->nocache_hash}%%\*\/';(\?>\n)?)/",
                                                                                      array($this, 'removeNocache'),
                                                                                      $_functionCode->to_smarty_php($compiler->parser)));
+            $this->compiler = null;
         }
-        $output = "<?php\n\n";
+        $output = "<?php\n";
         $output .= "/* {block '{$_name}'}  {$compiler->template->source->type}:{$compiler->template->source->name} */\n";
-        $output .= "function {$_funcName}(\$_smarty_tpl, \$block) {?>";
+        $output .= "function {$_funcName}(\$_smarty_tpl, \$_blockParentStack) {\n";
+        if (isset($_assign)) {
+            $output .= "ob_start();\n";
+        }
+        $output .= "?>\n";
         $compiler->parser->current_buffer->append_subtree($compiler->parser,
                                                           new Smarty_Internal_ParseTree_Tag($compiler->parser,
                                                                                             $output));
         $compiler->parser->current_buffer->append_subtree($compiler->parser, $_functionCode);
-        $output = "<?php\n}\n";
+        $output = "<?php\n";
+        if (isset($_assign)) {
+            $output .= "\$_smarty_tpl->tpl_vars[{$_assign}] = new Smarty_Variable(ob_get_contents());\n";
+        }
+        $output .= "}\n";
         $output .= "/* {/block '{$_name}'} */\n\n";
         $output .= "?>\n";
         $compiler->parser->current_buffer->append_subtree($compiler->parser,
                                                           new Smarty_Internal_ParseTree_Tag($compiler->parser,
                                                                                             $output));
-        $compiler->blockOrFunctionCode .= $f =
-            $compiler->parser->current_buffer->to_smarty_php($compiler->parser);
+        $compiler->blockOrFunctionCode .= $compiler->parser->current_buffer->to_smarty_php($compiler->parser);
         // nocache plugins must be copied
         if (!empty($compiler->template->compiled->required_plugins['nocache'])) {
             foreach ($compiler->template->compiled->required_plugins['nocache'] as $plugin => $tmp) {
@@ -213,38 +250,27 @@ class Smarty_Internal_Compile_Blockclose extends Smarty_Internal_CompileBase
                 }
             }
         }
+
+
         // restore old status
         $compiler->template->compiled->has_nocache_code = $_has_nocache_code;
         $compiler->tag_nocache = $compiler->nocache;
         $compiler->nocache = $_nocache;
         $compiler->parser->current_buffer = $_buffer;
-
-        $_parameter = $_attr;
-        foreach ($_parameter as $name => $stat) {
-            if ($stat === false) {
-                unset($_parameter[$name]);
-            }
-        }
-        if (isset($compiler->callChildBlock[$compiler->blockTagNestingLevel])) {
-            $_parameter['callChildBlock'] = 'true';
-            unset($compiler->callChildBlock[$compiler->blockTagNestingLevel]);
-        }
-        $compiler->blockTagNestingLevel --;
-        // inner {block} or child template {block} must register block
-        if ($compiler->blockTagNestingLevel == 0 && $compiler->inheritanceChild) {
-            $_function = 'register';
+        $output = "<?php \n";
+        if ($compiler->_cache['blockNesting'] == 1) {
+            $output .= "\$_smarty_tpl->_inheritance->processBlock(\$_smarty_tpl, 0, {$compiler->_cache['blockName'][$compiler->_cache['blockNesting']]}, " .
+                var_export($_block, true) . ");\n";
         } else {
-            $_function = 'call';
+            $output .= "\$_smarty_tpl->_inheritance->processBlock(\$_smarty_tpl, 0, {$compiler->_cache['blockName'][$compiler->_cache['blockNesting']]}, " .
+                var_export($_block, true) . ", \$_blockParentStack);\n";
+
         }
-        $cm = $compiler->template->caching ? 'true' : 'false';
-        $output =
-            "<?php \n\$_smarty_tpl->_Block->{$_function}Block(\$_smarty_tpl, array('caching' => {$cm}, 'function' => '{$_funcNameCaching}'";
-        foreach ($_parameter as $name => $stat) {
-            if ($stat !== false) {
-                $output .= ", '{$name}' => {$stat}";
-            }
+        $output .= "?>\n";
+        $compiler->_cache['blockNesting'] --;
+        if ($compiler->_cache['blockNesting'] == 0) {
+            unset($compiler->_cache['blockNesting']);
         }
-        $output .= "));\n?>\n";
         $compiler->has_code = true;
         $compiler->suppressNocacheProcessing = true;
         return $output;
diff --git a/libs/sysplugins/smarty_internal_compile_extends.php b/libs/sysplugins/smarty_internal_compile_extends.php
index 0b8a1836..d1b26a86 100644
--- a/libs/sysplugins/smarty_internal_compile_extends.php
+++ b/libs/sysplugins/smarty_internal_compile_extends.php
@@ -15,7 +15,7 @@
  * @package    Smarty
  * @subpackage Compiler
  */
-class Smarty_Internal_Compile_Extends extends Smarty_Internal_CompileBase
+class Smarty_Internal_Compile_Extends extends Smarty_Internal_Compile_Shared_Inheritance
 {
     /**
      * Attribute definition: Overwrites base class.
@@ -25,6 +25,14 @@ class Smarty_Internal_Compile_Extends extends Smarty_Internal_CompileBase
      */
     public $required_attributes = array('file');
 
+    /**
+     * Array of names of optional attribute required by tag
+     * use array('_any') if there is no restriction of attributes names
+     *
+     * @var array
+     */
+    public $optional_attributes = array('extends_resource');
+
     /**
      * Attribute definition: Overwrites base class.
      *
@@ -34,7 +42,7 @@ class Smarty_Internal_Compile_Extends extends Smarty_Internal_CompileBase
     public $shorttag_order = array('file');
 
     /**
-     * Compiles code for the {extends} tag
+     * Compiles code for the {extends} tag extends: resource
      *
      * @param array                                 $args     array with attributes from parser
      * @param \Smarty_Internal_TemplateCompilerBase $compiler compiler object
@@ -53,11 +61,74 @@ class Smarty_Internal_Compile_Extends extends Smarty_Internal_CompileBase
         if (strpos($_attr['file'], '$_tmp') !== false) {
             $compiler->trigger_template_error('illegal value for file attribute', $compiler->parser->lex->line - 1);
         }
-        // save template name
-        $compiler->extendsFileName = $_attr['file'];
-        // process {block} in child template mode
-        $compiler->inheritanceChild = true;
+        // add code to initialize inheritance
+        $this->registerInit($compiler, true);
+        $file = trim($_attr['file'], '\'"');
+        if (strlen($file) > 8 && substr($file, 0, 8) == 'extends:') {
+            // generate code for each template
+            $files = array_reverse(explode('|', substr($file, 8)));
+            $i = 0;
+            foreach ($files as $file) {
+                if ($file[0] == '"') {
+                    $file = trim($file, '".');
+                } else {
+                    $file = "'{$file}'";
+                }
+                $i ++;
+                if ($i == count($files) && isset($_attr['extends_resource'])) {
+                    $this->compileEndChild($compiler);
+                }
+                $this->compileInclude($compiler, $file);
+            }
+            if (!isset($_attr['extends_resource'])) {
+                $this->compileEndChild($compiler);
+            }
+        } else {
+            $this->compileEndChild($compiler);
+            $this->compileInclude($compiler, $_attr['file']);
+        }
         $compiler->has_code = false;
         return '';
     }
+
+    /**
+     * Add code for inheritance endChild() method to end of template
+     *
+     * @param \Smarty_Internal_TemplateCompilerBase $compiler
+     */
+    private function compileEndChild(Smarty_Internal_TemplateCompilerBase $compiler)
+    {
+        $compiler->parser->template_postfix[] = new Smarty_Internal_ParseTree_Tag($compiler->parser,
+                                                                                  "<?php \$_smarty_tpl->_inheritance->endChild(\$_smarty_tpl);\n?>\n");
+    }
+
+    /**
+     * Add code for including subtemplate to end of template
+     *
+     * @param \Smarty_Internal_TemplateCompilerBase $compiler
+     * @param  string                               $file subtemplate name
+     */
+    private function compileInclude(Smarty_Internal_TemplateCompilerBase $compiler, $file)
+    {
+        $compiler->parser->template_postfix[] = new Smarty_Internal_ParseTree_Tag($compiler->parser,
+                                                                                  $compiler->compileTag('include',
+                                                                                                        array($file,
+                                                                                                              array('scope' => 'parent'))));
+    }
+
+    /**
+     * Create source code for {extends} from source components array
+     *
+     * @param []\Smarty_Internal_Template_Source $components
+     *
+     * @return string
+     */
+    public static function extendsSourceArrayCode($components)
+    {
+        $resources = array();
+        foreach ($components as $source) {
+            $resources[] = $source->resource;
+        }
+        return '{extends file=\'extends:' . join('|', $resources) . '\' extends_resource=true}';
+    }
 }
diff --git a/libs/sysplugins/smarty_internal_compile_include.php b/libs/sysplugins/smarty_internal_compile_include.php
index a78673a9..64aed4ce 100644
--- a/libs/sysplugins/smarty_internal_compile_include.php
+++ b/libs/sysplugins/smarty_internal_compile_include.php
@@ -98,9 +98,6 @@ class Smarty_Internal_Compile_Include extends Smarty_Internal_CompileBase
         } else {
             $variable_template = true;
         }
-        if ($compiler->inheritanceForceChild) {
-            $hashResourceName .= '-child';
-        }
 
         if (isset($_attr['assign'])) {
             // output will be stored in a smarty variable instead of being displayed
@@ -297,19 +294,22 @@ class Smarty_Internal_Compile_Include extends Smarty_Internal_CompileBase
      *
      * @return bool
      */
-    public function compileInlineTemplate(Smarty_Internal_SmartyTemplateCompiler $compiler, $fullResourceName, $_caching, $hashResourceName, $t_hash, $c_id)
+    public function compileInlineTemplate(Smarty_Internal_SmartyTemplateCompiler $compiler, $fullResourceName,
+                                          $_caching, $hashResourceName, $t_hash, $c_id)
     {
         $compiler->smarty->allow_ambiguous_resources = true;
         /* @var Smarty_Internal_Template $tpl */
-        $tpl = new $compiler->smarty->template_class (trim($fullResourceName, "'"), $compiler->smarty, $compiler->template,
-                                                  $compiler->template->cache_id, $c_id, $_caching);
-        $compiler->parent_compiler->mergedSubTemplatesData[$hashResourceName][$t_hash]['uid'] = $tpl->source->uid;
+        $tpl =
+            new $compiler->smarty->template_class (trim($fullResourceName, "'"), $compiler->smarty, $compiler->template,
+                                                   $compiler->template->cache_id, $c_id, $_caching);
         if (!($tpl->source->handler->uncompiled) && $tpl->source->exists) {
+            $compiler->parent_compiler->mergedSubTemplatesData[$hashResourceName][$t_hash]['uid'] = $tpl->source->uid;
+            if (isset($compiler->template->_inheritance)) {
+                $tpl->_inheritance = clone $compiler->template->_inheritance;
+            }
             $tpl->compiled = new Smarty_Template_Compiled();
             $tpl->compiled->nocache_hash = $compiler->parent_compiler->template->compiled->nocache_hash;
             $tpl->loadCompiler();
-            $tpl->compiler->inheritanceChild = $tpl->compiler->inheritanceForceChild = $compiler->inheritanceForceChild;
-            $tpl->compiler->inheritance = $compiler->inheritance;
             // save unique function name
             $compiler->parent_compiler->mergedSubTemplatesData[$hashResourceName][$t_hash]['func'] =
             $tpl->compiled->unifunc = 'content_' . str_replace(array('.', ','), '_', uniqid('', true));
@@ -328,13 +328,12 @@ class Smarty_Internal_Compile_Include extends Smarty_Internal_CompileBase
             $compiled_code .= "<?php\n\n";
             $compiled_code .= "/* End inline template \"{$tpl->source->type}:{$tpl->source->name}\" =============================*/\n";
             $compiled_code .= "?>";
-            $compiler->inheritanceParentIsChild = $tpl->compiler->inheritanceChild;
-            $compiler->inheritance = $tpl->compiler->inheritance;
             unset($tpl->compiler);
             if ($tpl->compiled->has_nocache_code) {
                 // replace nocache_hash
-                $compiled_code = str_replace("{$tpl->compiled->nocache_hash}", $compiler->template->compiled->nocache_hash,
-                                             $compiled_code);
+                $compiled_code =
+                    str_replace("{$tpl->compiled->nocache_hash}", $compiler->template->compiled->nocache_hash,
+                                $compiled_code);
                 $compiler->template->compiled->has_nocache_code = true;
             }
             $compiler->parent_compiler->mergedSubTemplatesCode[$tpl->compiled->unifunc] = $compiled_code;
diff --git a/libs/sysplugins/smarty_internal_compile_shared_inheritance.php b/libs/sysplugins/smarty_internal_compile_shared_inheritance.php
new file mode 100644
index 00000000..445ad7ae
--- /dev/null
+++ b/libs/sysplugins/smarty_internal_compile_shared_inheritance.php
@@ -0,0 +1,46 @@
+<?php
+/**
+ * Smarty Internal Plugin Compile Shared Inheritance
+ * Shared methods for {extends} and {block} tags
+ *
+ * @package    Smarty
+ * @subpackage Compiler
+ * @author     Uwe Tews
+ */
+
+/**
+ * Smarty Internal Plugin Compile Shared Inheritance Class
+ *
+ * @package    Smarty
+ * @subpackage Compiler
+ */
+class Smarty_Internal_Compile_Shared_Inheritance extends Smarty_Internal_CompileBase
+{
+    /**
+     * Register post compile callback to compile inheritance initialization code
+     *
+     * @param \Smarty_Internal_TemplateCompilerBase $compiler
+     * @param bool|false                            $initChildSequence if true force child template
+     */
+    public function registerInit(Smarty_Internal_TemplateCompilerBase $compiler, $initChildSequence = false)
+    {
+        if ($initChildSequence || !isset($compiler->_cache['inheritanceInit'])) {
+            $compiler->registerPostCompileCallback(array('Smarty_Internal_Compile_Shared_Inheritance', 'postCompile'),
+                                                   array($initChildSequence), 'inheritanceInit', $initChildSequence);
+
+            $compiler->_cache['inheritanceInit'] = true;
+        }
+    }
+
+    /**
+     * Compile inheritance initialization code as prefix
+     *
+     * @param \Smarty_Internal_TemplateCompilerBase $compiler
+     * @param bool|false                            $initChildSequence if true force child template
+     */
+    static function postCompile(Smarty_Internal_TemplateCompilerBase $compiler, $initChildSequence = false)
+    {
+        $compiler->prefixCompiledCode .= "<?php \$_smarty_tpl->_inheritance->init(\$_smarty_tpl, " .
+            var_export($initChildSequence, true) . ");\n?>\n";
+    }
+}
\ No newline at end of file
diff --git a/libs/sysplugins/smarty_internal_runtime_block.php b/libs/sysplugins/smarty_internal_runtime_block.php
deleted file mode 100644
index 36694588..00000000
--- a/libs/sysplugins/smarty_internal_runtime_block.php
+++ /dev/null
@@ -1,98 +0,0 @@
-<?php
-
-/**
- * Runtime Method _callBlock, _callParentBlock, _callChildBlock, _registerBlock
- *
- * @package    Smarty
- * @subpackage PluginsInternal
- * @author     Uwe Tews
- *
- **/
-class Smarty_Internal_Runtime_Block
-{
-    
-    public $inheritanceBlocks = array();
-    
-    /**
-     * Call inheritance {block} tag
-     *
-     * @param \Smarty_Internal_Template $callerTpl template object of caller
-     * @param array                     $block     block parameter
-     */
-    public function callBlock(Smarty_Internal_Template $callerTpl, $block)
-    {
-        $function = $block['function'];
-        $level = isset($block['level']) ? $block['level'] : 0;
-        // find to level child block
-        while (!isset($block['callChildBlock']) &&
-            isset($this->inheritanceBlocks[$block['name']][$level])) {
-            $block = $this->inheritanceBlocks[$block['name']][$level];
-            $block['level'] = $level;
-            $level ++;
-        }
-        // ignore hidden block
-        if (isset($block['hide'])) {
-            return;
-        }
-        // root block function for possible parent block call
-        $block['root'] = $function;
-        if (isset($block['append'])) {
-            $this->callParentBlock($callerTpl, $block);
-        }
-        $block['function']($callerTpl, $block);
-        if (isset($block['prepend'])) {
-            $this->callParentBlock($callerTpl, $block);
-        }
-    }
-
-    /**
-     * Call inheritance parent {block} tag
-     *
-     * @param \Smarty_Internal_Template $callerTpl template object of caller
-     * @param array                     $block     block parameter
-     */
-    public function callParentBlock(Smarty_Internal_Template $callerTpl, $block)
-    {
-        $level = isset($block['level']) ? $block['level'] : 0;
-        if (isset($this->inheritanceBlocks[$block['name']][$level - 1])) {
-            // call registered parent
-            $parent = $this->inheritanceBlocks[$block['name']][$level - 1];
-            $parent['root'] = $block['root'];
-            $parent['function']($callerTpl, $parent);
-        } else {
-            // default to root block
-            $block['root']($callerTpl, $block);
-        }
-    }
-
-    /**
-     * Call inheritance child {block} tag
-     *
-     * @param \Smarty_Internal_Template $callerTpl template object of caller
-     * @param array                     $block     block parameter
-     */
-    public function callChildBlock(Smarty_Internal_Template $callerTpl, $block)
-    {
-        $level = isset($block['level']) ? $block['level'] : - 1;
-        if (isset($this->inheritanceBlocks[$block['name']][$level + 1])) {
-            $child = $this->inheritanceBlocks[$block['name']][$level + 1];
-            $child['level'] = $level + 1;
-            $child['function']($callerTpl, $child);
-        }
-    }
-
-    /**
-     * Register inheritance {block} tag
-     *
-     * @param \Smarty_Internal_Template $callerTpl template object of caller
-     * @param array                     $block     block parameter
-     */
-    public function registerBlock(Smarty_Internal_Template $callerTpl, $block)
-    {
-        if (!isset($this->inheritanceBlocks[$block['name']])) {
-            $this->inheritanceBlocks[$block['name']][0] = $block;
-        } else {
-            array_unshift($this->inheritanceBlocks[$block['name']], $block);
-        }
-    }
-}
\ No newline at end of file
diff --git a/libs/sysplugins/smarty_internal_runtime_inheritance.php b/libs/sysplugins/smarty_internal_runtime_inheritance.php
new file mode 100644
index 00000000..54a55565
--- /dev/null
+++ b/libs/sysplugins/smarty_internal_runtime_inheritance.php
@@ -0,0 +1,208 @@
+<?php
+
+/**
+ * Runtime Method callBlock,callParentBlock, callChildBlock, registerBlock
+ *
+ * @package    Smarty
+ * @subpackage PluginsInternal
+ * @author     Uwe Tews
+ *
+ **/
+class Smarty_Internal_Runtime_Inheritance
+{
+
+    /**
+     * State machine
+     * - 0 idle next extends will create a new inheritance tree
+     * - 1 processing child template
+     * - 2 wait for next inheritance template
+     * - 3 assume parent template, if child will loaded goto state 1
+     *     a call to a sub template resets the state to 0
+     *
+     * @var int
+     */
+    public $state = 0;
+
+    /**
+     * Array of block parameter of known {block} tags
+     *
+     * @var array
+     */
+    public $blockParameter = array();
+
+    /**
+     * inheritance template nesting level
+     *
+     * @var int
+     */
+    public $inheritanceLevel = 0;
+
+    /**
+     * inheritance template index
+     *
+     * @var int
+     */
+    public $tplIndex = - 1;
+
+    /**
+     * Array of compiled template file path
+     * - key template index
+     * only used when caching is enabled
+     *
+     * @var []string
+     */
+    public $compiledFilePath = array();
+
+    /**
+     * Current {block} nesting level
+     *
+     * @var int
+     */
+    public $blockNesting = 0;
+
+    /**
+     * Initialize inheritance
+     *
+     * @param \Smarty_Internal_Template $tpl        template object of caller
+     * @param bool                      $initChild  if true init for child template
+     * @param array                     $blockNames outer level block name
+     *
+     */
+    public function init(Smarty_Internal_Template $tpl, $initChild, $blockNames = array())
+    {
+        // if template was from an inner block or template is a parent template create new inheritance root
+        if ($initChild && ($this->blockNesting || $this->state == 3)) {
+            $tpl->_inheritance = new Smarty_Internal_Runtime_Inheritance();
+            $tpl->_inheritance->init($tpl, $initChild, $blockNames);
+            return;
+        }
+        // start of child sub template(s)
+        if ($initChild) {
+            $this->state = 1;
+            if (!$this->inheritanceLevel) {
+                //grab any output of child templates
+                ob_start();
+            }
+            $this->inheritanceLevel ++;
+        }
+        // in parent state {include} will not increment template index
+        if ($this->state != 3) {
+            $this->tplIndex ++;
+        }
+        // if state was waiting for parent change state to parent
+        if ($this->state == 2) {
+            $this->state = 3;
+        }
+    }
+
+    /**
+     * End of child template(s)
+     * - if outer level is reached flush output buffer and switch to wait for parent template state
+     *
+     * @param \Smarty_Internal_Template $tpl template object of caller
+     */
+    public function endChild(Smarty_Internal_Template $tpl)
+    {
+        $this->inheritanceLevel --;
+        if (!$this->inheritanceLevel) {
+            ob_end_clean();
+            $this->state = 2;
+        }
+    }
+
+    /**
+     * Process inheritance {block} tag
+     *
+     * $type 0 = {block}:
+     *  - search in inheritance template hierarchy for child blocks
+     *    if found call it, otherwise call current block
+     *  - ignored for outer level blocks in child templates
+     *
+     * $type 1 = {$smarty.block.child}:
+     *  - search in inheritance template hierarchy for child blocks
+     *    if found call it, otherwise ignore
+     *
+     * $type 2 = {$smarty.block.parent}:
+     *  - get block id from parent stack and call parent block
+     *
+     * @param \Smarty_Internal_Template $tpl       template object of caller
+     * @param int                       $type      call type see above
+     * @param string                    $name      block name
+     * @param array                     $block     block parameter
+     * @param array                     $callStack call stack with block parameters
+     *
+     * @throws \SmartyException
+     */
+    public function processBlock(Smarty_Internal_Template $tpl, $type = 0, $name, $block, $callStack = array())
+    {
+        if (!isset($this->blockParameter[$name])) {
+            $this->blockParameter[$name] = array();
+        }
+        if ($this->state == 1) {
+            $block[2] = count($this->blockParameter[$name]);
+            $block[3] = $this->tplIndex;
+            $this->blockParameter[$name][] = $block;
+            return;
+        }
+        if ($type == 3) {
+            if (!empty($callStack)) {
+                array_shift($callStack);
+                if (empty($callStack)) {
+                    throw new SmartyException("inheritance: tag {\$smarty.block.parent} used in parent template block '{$name}'");
+                }
+                $block = array_shift($callStack);
+            } else {
+                return;
+            }
+        } else {
+            $blockParameter = &$this->blockParameter[$name];
+            if ($type == 0) {
+                $index = $block[2] = count($blockParameter);
+                $block[3] = $this->tplIndex;
+                $callStack = array(&$block);
+            } elseif ($type == 1) {
+                $block[3] = $callStack[0][3];
+                $index = 0;
+                for ($i = 0; $i < count($blockParameter); $i ++) {
+                    if ($blockParameter[$i][3] <= $block[3]) {
+                        $index = $blockParameter[$i][2];
+                    }
+                }
+                $block[2] = $index;
+                $callStack = array(&$block);
+            } else {
+                $index = $callStack[0][2];
+                if ($index == 0) {
+                    return;
+                }
+                $callStack = $block = array(1 => false);
+            }
+            $index --;
+            // find lowest level child block
+            while ($index >= 0 && ($type || !$block[1])) {
+                $block = &$blockParameter[$index];
+                array_unshift($callStack, $block);
+                if ($block[1]) {
+                    break;
+                }
+                $index --;
+            }
+            if (isset($block['hide']) && $index <= 0) {
+                return;
+            }
+        }
+        $this->blockNesting ++;
+        if (isset($block['append'])) {
+            $this->processBlock($tpl, 3, $name, null, $callStack);
+        }
+        if (isset($block[6])) {
+            $block[6]($tpl, $callStack);
+        } else {
+            $block[0]($tpl, $callStack);
+        }
+        if (isset($block['prepend'])) {
+            $this->processBlock($tpl, 3, $name, null, $callStack);
+        }
+        $this->blockNesting --;
+    }
+}
diff --git a/libs/sysplugins/smarty_internal_template.php b/libs/sysplugins/smarty_internal_template.php
index 88e711a9..16fca678 100644
--- a/libs/sysplugins/smarty_internal_template.php
+++ b/libs/sysplugins/smarty_internal_template.php
@@ -17,6 +17,7 @@
  * @property Smarty_Template_Source|Smarty_Template_Config $source
  * @property Smarty_Template_Compiled                      $compiled
  * @property Smarty_Template_Cached                        $cached
+ * @property Smarty_Internal_Runtime_Inheritance           $_inheritance
  * @method bool mustCompile()
  */
 class Smarty_Internal_Template extends Smarty_Internal_TemplateBase
@@ -314,10 +315,10 @@ class Smarty_Internal_Template extends Smarty_Internal_TemplateBase
             }
             $tpl->tpl_function = $this->tpl_function;
             // copy inheritance object?
-            if (isset($this->_Block)) {
-                $tpl->_Block = $this->_Block;
+            if (isset($this->_inheritance)) {
+                $tpl->_inheritance = $this->_inheritance;
             } else {
-                unset($tpl->_Block);
+                unset($tpl->_inheritance);
             }
         } else {
             $tpl = clone $this;
@@ -692,8 +693,8 @@ class Smarty_Internal_Template extends Smarty_Internal_TemplateBase
     {
         // object properties of runtime template extensions will start with '_'
         if ($property_name[0] == '_') {
-            $property_name[1] = chr(ord($property_name[1]) & 0xDF);
             $class = 'Smarty_Internal_Runtime' . $property_name;
+            $class[24] = chr(ord($class[24]) & 0xDF);
             if (class_exists($class)) {
                 return $this->$property_name = new $class();
             }
diff --git a/libs/sysplugins/smarty_internal_templatecompilerbase.php b/libs/sysplugins/smarty_internal_templatecompilerbase.php
index 0fbf8851..9125b43f 100644
--- a/libs/sysplugins/smarty_internal_templatecompilerbase.php
+++ b/libs/sysplugins/smarty_internal_templatecompilerbase.php
@@ -14,6 +14,11 @@
  *
  * @package    Smarty
  * @subpackage Compiler
+ *
+ * @property Smarty_Internal_SmartyTemplateCompiler $prefixCompiledCode  = ''
+ * @property Smarty_Internal_SmartyTemplateCompiler $postfixCompiledCode = ''
+ * @method Smarty_Internal_SmartyTemplateCompiler registerPostCompileCallback($callback, $parameter = array(), $key = null, $replace = false)
+ * @method Smarty_Internal_SmartyTemplateCompiler unregisterPostCompileCallback($key)
  */
 abstract class Smarty_Internal_TemplateCompilerBase
 {
@@ -88,55 +93,6 @@ abstract class Smarty_Internal_TemplateCompilerBase
      */
     public $templateProperties = array();
 
-    /**
-     * sources which must be compiled
-     *
-     * @var array
-     */
-    public $sources = array();
-
-    /**
-     * flag when compiling inheritance template
-     *
-     * @var bool
-     */
-    public $inheritance = false;
-
-    /**
-     * flag when compiling inheritance child template
-     *
-     * @var bool
-     */
-    public $inheritanceChild = false;
-
-    /**
-     * Force all subtemplate calls to be inheritance childs
-     *
-     * @var bool
-     */
-    public $inheritanceForceChild = false;
-
-    /**
-     * Flag if compiled parent template is child of other parent
-     *
-     * @var bool
-     */
-    public $inheritanceParentIsChild = false;
-
-    /**
-     * uid of templates called by {extends} for recursion check
-     *
-     * @var array
-     */
-    public $extends_uid = array();
-
-    /**
-     * Template name of {extends} tag
-     *
-     * @var null|string
-     */
-    public $extendsFileName = null;
-
     /**
      * source line offset for error messages
      *
@@ -305,20 +261,6 @@ abstract class Smarty_Internal_TemplateCompilerBase
      */
     public $loopNesting = 0;
 
-    /**
-     * nesting level of block tags
-     *
-     * @var int
-     */
-    public $blockTagNestingLevel = 0;
-
-    /**
-     * Flag if {$smarty.block.child} was called at $blockTagNestingLevel
-     *
-     * @var array
-     */
-    public $callChildBlock = array();
-
     /**
      * Strip preg pattern
      *
@@ -333,6 +275,13 @@ abstract class Smarty_Internal_TemplateCompilerBase
      */
     public $plugin_search_order = array('function', 'block', 'compiler', 'class');
 
+    /**
+     * General storage area for tag compiler plugins
+     *
+     * @var array
+     */
+    public $_cache = array();
+
     /**
      * method to compile a Smarty template
      *
@@ -345,9 +294,12 @@ abstract class Smarty_Internal_TemplateCompilerBase
 
     /**
      * Initialize compiler
+     *
+     * @param Smarty $smarty global instance
      */
-    public function __construct()
+    public function __construct(Smarty $smarty)
     {
+        $this->smarty = $smarty;
         $this->nocache_hash = str_replace(array('.', ','), '_', uniqid(rand(), true));
     }
 
@@ -424,13 +376,13 @@ abstract class Smarty_Internal_TemplateCompilerBase
             // get template source
             if (!empty($this->template->source->components)) {
                 // we have array of inheritance templates by extends: resource
-                $this->sources = array_reverse($this->template->source->components);
-                $_content = '';
+                // generate corresponding source code sequence
+                $_content =
+                    Smarty_Internal_Compile_Extends::extendsSourceArrayCode($this->template->source->components);
             } else {
                 // get template source
                 $_content = $this->template->source->getContent();
             }
-
             $_compiled_code = $this->postFilter($this->doCompile($this->preFilter($_content), true));
         }
         catch (Exception $e) {
@@ -494,64 +446,6 @@ abstract class Smarty_Internal_TemplateCompilerBase
         }
     }
 
-    /**
-     * Add code to call parent template on inheritance child templates
-     *
-     * @param $parser
-     *
-     * @throws \SmartyException
-     */
-    public function processInheritance($parser)
-    {
-        if (isset($this->extendsFileName)) {
-            // child did use {extends}
-            $name = $this->extendsFileName;
-            $this->extendsFileName = null;
-            if (!$this->inheritanceForceChild && !$this->inheritance) {
-                // drop any output of child templates
-                array_unshift($parser->current_buffer->subtrees, new Smarty_Internal_ParseTree_Tag($parser,
-                                                                                                   "<?php ob_start();\n\$_smarty_tpl->_Block = new Smarty_Internal_Runtime_Block();?>\n"));
-                $this->inheritance = true;
-            }
-            $include = new Smarty_Internal_ParseTree_Tag($parser, $this->compileTag('include', array($name,
-                                                                                                     array('scope' => 'parent'),
-                                                                                                     array('inline' => true))));
-            if (!$this->inheritanceForceChild && !$this->inheritanceParentIsChild) {
-                $parser->current_buffer->append_subtree($parser, new Smarty_Internal_ParseTree_Tag($parser,
-                                                                                                   "<?php ob_end_clean();?>\n"));
-                $this->inheritance = false;
-            }
-            $this->inheritanceParentIsChild = false;
-            $parser->current_buffer->append_subtree($parser, $include);
-            return;
-        }
-        // template list of extends: resource ?
-        if (!empty($this->sources)) {
-            if (!$this->inheritanceForceChild) {
-                // drop any output of child templates
-                $parser->current_buffer->append_subtree($parser, new Smarty_Internal_ParseTree_Tag($parser,
-                                                                                                   "<?php ob_start();\n\$_smarty_tpl->_Block = new Smarty_Internal_Runtime_Block();?>\n"));
-            }
-            while (!empty($this->sources)) {
-                $source = array_shift($this->sources);
-                if (!$this->inheritanceForceChild && empty($this->sources)) {
-                    // drop any output of child templates
-                    $parser->current_buffer->append_subtree($parser, new Smarty_Internal_ParseTree_Tag($parser,
-                                                                                                       "<?php ob_end_clean();?>\n"));
-                }
-                $forceChild = $this->inheritanceForceChild;
-                $this->inheritanceForceChild = $this->inheritanceForceChild || !empty($this->sources);
-                $parser->current_buffer->append_subtree($parser, new Smarty_Internal_ParseTree_Tag($parser,
-                                                                                                   $this->compileTag('include',
-                                                                                                                     array("'{$source->resource}'",
-                                                                                                                           array('scope' => 'parent'),
-                                                                                                                           array('inline' => true)))));
-                // restore value
-                $this->inheritanceForceChild = $forceChild;
-            }
-        }
-    }
-
     /**
      * Compile Tag
      * This is a call back from the lexer/parser