--- parser3/src/main/execute.C	2001/03/10 11:44:42	1.82
+++ parser3/src/main/execute.C	2003/11/20 16:34:26	1.302
@@ -1,615 +1,1017 @@
-/*
-  $Id: execute.C,v 1.82 2001/03/10 11:44:42 paf Exp $
+/** @file
+	Parser: executor part of request class.
+
+	Copyright (c) 2001-2003 ArtLebedev Group (http://www.artlebedev.com)
+	Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
 */
 
+static const char * const IDENT_EXECUTE_C="$Date: 2003/11/20 16:34:26 $";
+
+#include "pa_opcode.h"
 #include "pa_array.h" 
-#include "code.h"
 #include "pa_request.h"
 #include "pa_vstring.h"
 #include "pa_vhash.h"
-#include "pa_vunknown.h"
-#include "pa_vcframe.h"
-#include "pa_vmframe.h"
+#include "pa_vvoid.h"
+#include "pa_vcode_frame.h"
+#include "pa_vmethod_frame.h"
 #include "pa_vobject.h"
 #include "pa_vdouble.h"
 #include "pa_vbool.h"
+#include "pa_vtable.h"
+#include "pa_vfile.h"
+#include "pa_vimage.h"
+#include "pa_wwrapper.h"
 
-#include <stdio.h>
-
-#define PUSH(value) stack.push(value)
-#define POP() static_cast<Value *>(stack.pop())
-#define POP_NAME() static_cast<Value *>(stack.pop())->as_string()
-
+//#define DEBUG_EXECUTE
 
+#ifdef DEBUG_EXECUTE
 char *opcode_name[]={
 	// literals
-	"VALUE",  "CODE__STORE_PARAM",
+	"VALUE",  "CURLY_CODE__STORE_PARAM",  "EXPR_CODE__STORE_PARAM",
+	"NESTED_CODE",
 
 	// actions
-	"WITH_SELF",	"WITH_ROOT",	"WITH_READ",	"WITH_WRITE",
+	"WITH_ROOT",	"WITH_SELF",	"WITH_READ",	"WITH_WRITE",
 	"GET_CLASS",
-	"CONSTRUCT_VALUE",  "CONSTRUCT_DOUBLE",
-	"WRITE",
-	"GET_ELEMENT",	"GET_ELEMENT__WRITE",
-	"CREATE_EWPOOL",	"REDUCE_EWPOOL",
-	"CREATE_RWPOOL",	"REDUCE_RWPOOL",
-  	"CREATE_SWPOOL",	"REDUCE_SWPOOL",
-	"GET_METHOD_FRAME",
+	"CONSTRUCT_VALUE", "CONSTRUCT_EXPR", "CURLY_CODE__CONSTRUCT",
+	"WRITE_VALUE",  "WRITE_EXPR_RESULT",  "STRING__WRITE",
+	"GET_ELEMENT_OR_OPERATOR", "GET_ELEMENT",	"GET_ELEMENT__WRITE",
+	"OBJECT_POOL",	"STRING_POOL",
 	"STORE_PARAM",
-	"CALL",
+	"PREPARE_TO_CONSTRUCT_OBJECT",	"PREPARE_TO_EXPRESSION", 
+	"CALL", "CALL__WRITE",
 
 	// expression ops: unary
-	"NEG", "INV", "NOT", "DEF", "IN", "FEXISTS",
+	"NEG", "INV", "NOT", "DEF", "IN", "FEXISTS", "DEXISTS",
 	// expression ops: binary
-	"SUB", "ADD", "MUL", "DIV", "MOD",
+	"SUB", "ADD", "MUL", "DIV", "MOD", "INTDIV",
+	"BIN_SL", "BIN_SR",
 	"BIN_AND", "BIN_OR", "BIN_XOR",
 	"LOG_AND", "LOG_OR", "LOG_XOR",
 	"NUM_LT", "NUM_GT", "NUM_LE", "NUM_GE", "NUM_EQ", "NUM_NE",
-	"STR_LT", "STR_GT", "STR_LE", "STR_GE", "STR_EQ", "STR_NE"
+	"STR_LT", "STR_GT", "STR_LE", "STR_GE", "STR_EQ", "STR_NE",
+	"IS"
 };
 
-void dump(int level, const Array& ops) {
-	if(0){
-		int size=ops.size();
-		//fprintf(stderr, "size=%d\n", size);
-		for(int i=0; i<size; i++) {
-			Operation op;
-			op.cast=ops.quick_get(i);
-			fprintf(stderr, "%8X\n", op.cast);
-		}
-	}
+void va_debug_printf(SAPI_Info& sapi_info, const char* fmt,va_list args) {
+	char buf[MAX_STRING];
+	vsnprintf(buf, MAX_STRING, fmt, args);
+	SAPI::log(sapi_info, "%s", buf);
+}
+
+void debug_printf(SAPI_Info& sapi_info, const char* fmt, ...) {
+    va_list args;
+    va_start(args, fmt);
+    va_debug_printf(sapi_info, fmt, args);
+    va_end(args);
+}
 
-	int size=ops.size();
-	//fprintf(stderr, "size=%d\n", size);
-	for(int i=0; i<size; i++) {
-		Operation op;
-		op.cast=ops.quick_get(i);
-		fprintf(stderr, "%*s%s", level*4, "", opcode_name[op.code]);
-
-		if(op.code==OP_VALUE) {
-			Value *value=static_cast<Value *>(ops.quick_get(++i));
-			fprintf(stderr, " \"%s\" %s", value->get_string()->cstr(), value->type());
+void debug_dump(SAPI_Info& sapi_info, int level, ArrayOperation& ops) {
+	Array_iterator<Operation> i(ops);
+	while(i.has_next()) {
+		OPCODE opcode=i.next().code;
+
+		if(opcode==OP_VALUE || opcode==OP_STRING__WRITE) {
+			Operation::Origin origin=i.next().origin;
+			Value& value=*i.next().value;
+			debug_printf(sapi_info, 
+				"%*s%s"
+				" \"%s\" %s", 
+				level*4, "", opcode_name[opcode],
+				value.get_string()->cstr(), value.type());
+			continue;
 		}
-		fprintf(stderr, "\n");
+		debug_printf(sapi_info, "%*s%s", level*4, "", opcode_name[opcode]);
 
-		if(op.code==OP_CODE__STORE_PARAM) {
-			const Array *local_ops=reinterpret_cast<const Array *>(ops.quick_get(++i));
-			dump(level+1, *local_ops);
+		switch(opcode) {
+		case OP_CURLY_CODE__STORE_PARAM: 
+		case OP_EXPR_CODE__STORE_PARAM:
+		case OP_CURLY_CODE__CONSTRUCT:
+		case OP_NESTED_CODE:
+		case OP_OBJECT_POOL:  
+		case OP_STRING_POOL:
+		case OP_CALL:
+		case OP_CALL__WRITE:
+			if(ArrayOperation* local_ops=i.next().ops)
+				debug_dump(sapi_info, level+1, *local_ops);
 		}
 	}
-	fflush(stderr);
 }
+#endif
 
-void Request::execute(const Array& ops) {
-	if(1) {
-		fputs("source----------------------------\n", stderr);
-		dump(0, ops);
-		fputs("execution-------------------------\n", stderr);
-	}
+// Request
+
+void Request::execute(ArrayOperation& ops) {
+	register Stack<StackItem>& stack=this->stack; // helps a lot on MSVC: 'esi'
 
-	int size=ops.size();
-	//fprintf(stderr, "size=%d\n", size);
-	for(int i=0; i<size; i++) {
-		Operation op;
-		op.cast=ops.quick_get(i);
-		fprintf(stderr, "%d:%s", stack.top_index()+1, opcode_name[op.code]); fflush(stderr);
+	const String* debug_name=0;  Operation::Origin debug_origin={0};
+	try{
+#ifdef DEBUG_EXECUTE
+	debug_printf(sapi_info, "source----------------------------\n");
+	debug_dump(sapi_info, 0, ops);
+	debug_printf(sapi_info, "execution-------------------------\n");
+#endif
+	for(Array_iterator<Operation> i(ops); i.has_next(); ) {
+		if(get_interrupted()) {
+			set_interrupted(false);
+			throw Exception("parser.interrupted",
+				0,
+				"execution stopped");
+		}
+		OPCODE opcode=i.next().code;
 
-		switch(op.code) {
+#ifdef DEBUG_EXECUTE
+		debug_printf(sapi_info, "%d:%s", stack.top_index()+1, opcode_name[opcode]);
+#endif
+
+		switch(opcode) {
 		// param in next instruction
 		case OP_VALUE:
 			{
-				Value *value=static_cast<Value *>(ops.quick_get(++i));
-				fprintf(stderr, " \"%s\" %s", value->get_string()->cstr(), value->type());
-				PUSH(value);
-				break;
-			}
-		case OP_CODE__STORE_PARAM:
-			{
-				VMethodFrame *frame=static_cast<VMethodFrame *>(stack.top_value());
-				// code
-				const Array *local_ops=reinterpret_cast<const Array *>(ops.quick_get(++i));
-				fprintf(stderr, " (%d)\n", local_ops->size());
-				dump(1, *local_ops);
-				
-				Junction& j=*NEW Junction(pool(), 
-					*self, 0, 0,
-					root, frame, frame, local_ops);
-				
-				Value *value=NEW VJunction(j);
-				///value->set_name(frame->name());
-
-				// store param
-				frame->store_param(value);
+				debug_origin=i.next().origin;
+				Value& value=*i.next().value;
+#ifdef DEBUG_EXECUTE
+				debug_printf(sapi_info, " \"%s\" %s", value.get_string()->cstr(), value.type());
+#endif
+				stack.push(value);
 				break;
 			}
 		case OP_GET_CLASS:
 			{
-				const String& name=POP_NAME();
-				VClass *vclass=static_cast<VClass *>(classes().get(name));
-				if(!vclass) 
-					THROW(0,0,
+				// maybe they do ^class:method[] call, remember the fact
+				wcontext->set_somebody_entered_some_class();
+
+				const String& name=stack.pop().string();
+				Value* value=classes().get(name);
+				if(!value) 
+					throw Exception("parser.runtime",
 						&name,
-						": undefined class"); 
+						"class is undefined"); 
 
-				PUSH(vclass);
+				stack.push(*value);
 				break;
 			}
 			
 		// OP_WITH
-		case OP_WITH_SELF: 
+		case OP_WITH_ROOT:
 			{
-				PUSH(self);
+				stack.push(*method_frame);
 				break;
 			}
-		case OP_WITH_ROOT: 
+		case OP_WITH_SELF: 
 			{
-				PUSH(root);
+				stack.push(get_self());
 				break;
 			}
 		case OP_WITH_READ: 
 			{
-				PUSH(rcontext);
+				stack.push(*rcontext);
 				break;
 			}
 		case OP_WITH_WRITE: 
 			{
-				PUSH(wcontext);
+				if(wcontext==method_frame)
+					throw Exception("parser.runtime",
+						0,
+						"$.name outside of $name[...]");
+
+				stack.push(*wcontext);
 				break;
 			}
 			
 		// OTHER ACTIONS BUT WITHs
 		case OP_CONSTRUCT_VALUE:
 			{
-				Value *value=POP();
-				const String& name=POP_NAME();
-				Value *ncontext=POP();
-				ncontext->put_element(name, value);
-				value->set_name(name);
+				Value& value=stack.pop().value();
+				const String& name=stack.pop().string();  debug_name=&name;
+				Value& ncontext=stack.pop().value();
+				ncontext.put_element(name, &value, false);
 				break;
 			}
 		case OP_CONSTRUCT_EXPR:
 			{
-				Value *value=POP();
-				const String& name=POP_NAME();
-				Value *ncontext=POP();
-				ncontext->put_element(name, value->get_expr_result());
-				value->set_name(name);
+				// see OP_PREPARE_TO_EXPRESSION
+				wcontext->set_in_expression(false);
+
+				Value& value=stack.pop().value();
+				const String& name=stack.pop().string();  debug_name=&name;
+				Value& ncontext=stack.pop().value();
+				ncontext.put_element(name, &value.as_expr_result(), false);
 				break;
 			}
-		case OP_WRITE:
+		case OP_CURLY_CODE__CONSTRUCT:
 			{
-				Value *value=POP();
-				wcontext->write(*value);
+				ArrayOperation& local_ops=*i.next().ops;
+#ifdef DEBUG_EXECUTE
+				debug_printf(sapi_info, " (%d)\n", local_ops.count());
+				debug_dump(sapi_info, 1, local_ops);
+#endif				
+				Value& value=*new VJunction(new Junction( 
+					get_self(), 0,
+					method_frame, 
+					rcontext, 
+					wcontext, 
+					&local_ops));
+
+				const String& name=stack.pop().string();  debug_name=&name;
+				Value& ncontext=stack.pop().value();
+				ncontext.put_element(name, &value, false);
 				break;
 			}
-			
-		case OP_GET_ELEMENT:
+		case OP_NESTED_CODE:
 			{
-				Value *value=get_element();
-				PUSH(value);
+				ArrayOperation& local_ops=*i.next().ops;
+#ifdef DEBUG_EXECUTE
+				debug_printf(sapi_info, " (%d)\n", local_ops.count());
+				debug_dump(sapi_info, 1, local_ops);
+#endif				
+				stack.push(local_ops);
 				break;
 			}
-
-		case OP_GET_ELEMENT__WRITE:
+		case OP_WRITE_VALUE:
 			{
-				Value *value=get_element();
-				wcontext->write(*value);
+				Value& value=stack.pop().value();
+				write_assign_lang(value);
 				break;
 			}
-
-
-		case OP_CREATE_EWPOOL:
+		case OP_WRITE_EXPR_RESULT:
 			{
-				PUSH(wcontext);
-				wcontext=NEW WWrapper(pool(), 0 /* empty */, true /* constructing */);
+				Value& value=stack.pop().value();
+				write_no_lang(value.as_expr_result());
+
+				// must be after write(result) and 
+				// see OP_PREPARE_TO_EXPRESSION
+				wcontext->set_in_expression(false);
 				break;
 			}
-		case OP_REDUCE_EWPOOL:
+		case OP_STRING__WRITE:
 			{
-				Value *value=wcontext->result();
-				wcontext=static_cast<WContext *>(POP());
-				PUSH(value);
+				i.next(); // ignore origin
+				Value* value=i.next().value;
+#ifdef DEBUG_EXECUTE
+				debug_printf(sapi_info, " \"%s\"", value->get_string()->cstr());
+#endif
+				write_no_lang(*value->get_string());
 				break;
 			}
 			
-		case OP_CREATE_RWPOOL:
+		case OP_GET_ELEMENT_OR_OPERATOR:
 			{
-				Value *ncontext=POP();
-				PUSH(rcontext);
-				rcontext=ncontext;
-				PUSH(wcontext);
-				wcontext=NEW WWrapper(pool(), ncontext, false /* not constructing */);
+				const String& name=stack.pop().string();  debug_name=&name;
+				Value& ncontext=stack.pop().value();
+				Value& value=get_element(ncontext, name, true);
+				stack.push(value);
 				break;
 			}
-		case OP_REDUCE_RWPOOL:
+		case OP_GET_ELEMENT:
 			{
-				const String *string=wcontext->get_string();
-				Value *value;
-				if(string)
-					value=NEW VString(*string);
-				else
-					value=NEW VUnknown(pool());
-				wcontext=static_cast<WContext *>(POP());
-				rcontext=POP();
-				PUSH(value);
+				const String& name=stack.pop().string();  debug_name=&name;
+				Value& ncontext=stack.pop().value();
+				Value& value=get_element(ncontext, name, false);
+				stack.push(value);
 				break;
 			}
-		case OP_CREATE_SWPOOL:
+
+		case OP_GET_ELEMENT__WRITE:
 			{
-				PUSH(wcontext);
-				wcontext=NEW WWrapper(pool(), 0 /* empty */, false /* not constructing */);
+				const String& name=stack.pop().string();  debug_name=&name;
+				Value& ncontext=stack.pop().value();
+				Value& value=get_element(ncontext, name, false);
+				write_assign_lang(value);
 				break;
 			}
-		case OP_REDUCE_SWPOOL:
+
+
+		case OP_OBJECT_POOL:
 			{
+				ArrayOperation& local_ops=*i.next().ops;
+				
+				WContext *saved_wcontext=wcontext;
+				String::Language saved_lang=flang;
+				flang=String::L_PASS_APPENDED;
+				WWrapper local(0/*empty*/, wcontext);
+				wcontext=&local;
+
+				execute(local_ops);
+
+				stack.push(wcontext->result().as_value());
+				flang=saved_lang;
+				wcontext=saved_wcontext;
+				break;
+			}
+			
+		case OP_STRING_POOL:
+			{
+				ArrayOperation& local_ops=*i.next().ops;
+
+				WContext *saved_wcontext=wcontext;
+				WWrapper local(0 /*empty*/, wcontext);
+				wcontext=&local;
+
+				execute(local_ops);
+
+				Value* value;
 				// from "$a $b" part of expression taking only string value,
 				// ignoring any other content of wcontext
-				const String *string=wcontext->get_string();
-				Value *value;
-				if(string)
-					value=NEW VString(*string);
+				if(const String* string=wcontext->get_string())
+					value=new VString(*string);
 				else
-					NEW VUnknown(pool());
-				wcontext=static_cast<WContext *>(POP());
-				PUSH(value);
+					value=new VVoid;
+				stack.push(*value);
+
+				wcontext=saved_wcontext;
 				break;
 			}
 
 		// CALL
-		case OP_GET_METHOD_FRAME:
+		case OP_STORE_PARAM:
 			{
-				Value *value=POP();
-				// info: this one's always method-junction, not a code-junction
-				Junction *junction=value->get_junction();
-				if(!junction)
-					THROW(0,0,
-						&value->name(),
-						"type is '%s', can not call it (must be method or junction)",
-							value->type()); 
-
-				VMethodFrame *frame=NEW VMethodFrame(pool(), *junction);
-				frame->set_name(junction->self.name());
-				PUSH(frame);
+				Value& value=stack.pop().value();
+				VMethodFrame& frame=stack.top_value().method_frame();
+				// this op is executed from CALL local_ops only, so may skip the check "method_frame_to_fill==0"
+				frame.store_param(value);
 				break;
 			}
-		case OP_STORE_PARAM:
+		case OP_CURLY_CODE__STORE_PARAM:
+		case OP_EXPR_CODE__STORE_PARAM:
 			{
-				Value *value=POP();
-				VMethodFrame *frame=static_cast<VMethodFrame *>(stack.top_value());
-				frame->store_param(value);
+				// code
+				ArrayOperation& local_ops=*i.next().ops;
+				VMethodFrame& frame=stack.top_value().method_frame();
+#ifdef DEBUG_EXECUTE
+				debug_printf(sapi_info, " (%d)\n", local_ops.count());
+				debug_dump(sapi_info, 1, local_ops);
+#endif				
+				// when they evaluate expression parameter,
+				// the object expression result
+				// does not need to be written into calling frame
+				// it must go into any expressions using that parameter
+				// hence, we zero junction.wcontext here, and later
+				// in .process we would test that field 
+				// in decision "which wwrapper to use"
+				Value& value=*new VJunction(new Junction(
+					get_self(), 0,
+					method_frame, 
+					rcontext, 
+					opcode==OP_EXPR_CODE__STORE_PARAM?0:wcontext, 
+					&local_ops));
+				// store param
+				// this op is executed from CALL local_ops only, so can not check method_frame_to_fill==0
+				frame.store_param(value);
+				break;
+			}
+
+		case OP_PREPARE_TO_CONSTRUCT_OBJECT:
+			{
+				wcontext->set_constructing(true);
+				break;
+			}
+
+		case OP_PREPARE_TO_EXPRESSION:
+			{
+				wcontext->set_in_expression(true);
 				break;
 			}
 
 		case OP_CALL:
+		case OP_CALL__WRITE:
 			{
-				fprintf(stderr, "->\n");
-				VMethodFrame *frame=static_cast<VMethodFrame *>(POP());
-				frame->fill_unspecified_params();
-				PUSH(self);  
-				PUSH(root);  
-				PUSH(rcontext);  
-				PUSH(wcontext); 
+				//is_debug_junction=true;
+				ArrayOperation* local_ops=i.next().ops;
+#ifdef DEBUG_EXECUTE
+				debug_printf(sapi_info, " (%d)\n", local_ops?local_ops->count():0);
+				if(local_ops)
+					debug_dump(sapi_info, 1, *local_ops);
+
+				debug_printf(sapi_info, "->\n");
+#endif
+				Value& value=stack.pop().value();
+
+				Junction* junction=value.get_junction();
+				if(!junction) {
+					if(value.is("void"))
+						throw Exception("parser.runtime",
+							0,
+							"undefined method");
+					else
+						throw Exception("parser.runtime",
+							0,
+							"is '%s', not a method or junction, can not call it",
+								value.type());
+				}
+				/* no check needed, code compiled the way that that's impossible
+				// check: 
+				//	that this is method-junction, not a code-junction
+				// [disabling these contstructions:]
+				// $junction{code}
+				//  ^junction[]
+				if(!junction->method)
+					throw Exception("parser.runtime",
+						
+						"is '%s', it is code junction, can not call it",
+							value.type());
+				*/
+
+				VMethodFrame frame(*junction, method_frame/*caller*/);
+				if(local_ops){ // store param code goes here
+					stack.push(frame); // argument for *STORE_PARAM ops
+					execute(*local_ops);
+					stack.pop().value();
+				}
+				frame.fill_unspecified_params();
+				VMethodFrame *saved_method_frame=method_frame;
+				Value* saved_rcontext=rcontext;
+				WContext *saved_wcontext=wcontext;
 				
-				VClass *called_class=frame->junction.self.get_class();
-				// is context object or class & is it my class or my parent's class?
-				VClass *read_class=rcontext->get_class();
-				if(read_class && read_class->is_or_derived_from(*called_class)) // yes
-					self=rcontext; // class dynamic call
-				else // no, not me or relative of mine (total stranger)
-					if(wcontext->constructing()) {  // constructing?
-						// yes, constructor call: $some(^class:method(..))
-						self=NEW VObject(pool(), *called_class);
-						frame->write(*self);
-					} else 
-						self=&frame->junction.self; // no, static or simple dynamic call
+				VStateless_class& called_class=*frame.junction.self.get_class();
+				Value* new_self=&get_self();
+				if(wcontext->get_constructing()) {
+					wcontext->set_constructing(false);
+					if(frame.junction.method->call_type!=Method::CT_STATIC) {
+						// this is a constructor call
+
+						if(Value* value=called_class.create_new_value(fpool)) {
+							// some stateless_class creatable derivates
+							new_self=value;
+						} else 
+							throw Exception("parser.runtime",
+								0, //&frame.name(),
+								"is not a constructor, system class '%s' can be constructed only implicitly", 
+									called_class.name().cstr());
+
+						frame.write(*new_self, 
+							String::L_CLEAN  // not used, always an object, not string
+						);
+					} else
+						throw Exception("parser.runtime",
+							0, //&frame.name(),
+							"method is static and can not be used as constructor");
+				} else
+					new_self=&frame.junction.self;
 
-				frame->set_self(*self);
-				root=rcontext=wcontext=frame;
+				frame.set_self(*new_self);
+
+				// see OP_PREPARE_TO_EXPRESSION
+				frame.set_in_expression(wcontext->get_in_expression());
+				
+				rcontext=wcontext=&frame;
 				{
-					// take object or class from any wrappers
-					VAliased *aliased=self->get_aliased();
-					// substitute class alias to the class they are called AS
-					Temp_alias temp_alias(*aliased, *frame->junction.vclass);
-
-					Method& method=*frame->junction.method;
-					if(method.native_code) { // native code?
-						method.check_actual_numbered_params(frame->numbered_params());
-						(*method.native_code)(*this, frame->numbered_params()); // execute it
-					} else // parser code
-						execute(*method.parser_code); // execute it
-				}
-				Value *value=wcontext->result();
+					const Method& method=*frame.junction.method;
+					Method::Call_type call_type=
+						&called_class==new_self ? Method::CT_STATIC : Method::CT_DYNAMIC;
+					if(
+						method.call_type==Method::CT_ANY ||
+						method.call_type==call_type) { // allowed call type?
+						method_frame=&frame;
+						if(method.native_code) { // native code?
+							method.check_actual_numbered_params(
+								frame.junction.self, 
+								/*frame.name(), */frame.numbered_params());
+							method.native_code(
+								*this, 
+								*frame.numbered_params()); // execute it
+						} else // parser code, execute it
+							recoursion_checked_execute(/*frame.name(), */*method.parser_code);
+					} else
+						throw Exception("parser.runtime",
+							0, //&frame.name(),
+							"is not allowed to be called %s", 
+								call_type==Method::CT_STATIC?"statically":"dynamically");
 
-				wcontext=static_cast<WContext *>(POP());  
-				rcontext=POP();  
-				root=POP();  
-				self=static_cast<VAliased *>(POP());
+				}
+				StringOrValue result=wcontext->result();
 
-				PUSH(value);
-				fprintf(stderr, "<-returned");
+				wcontext=saved_wcontext;
+				rcontext=saved_rcontext;
+				method_frame=saved_method_frame;
+
+				if(opcode==OP_CALL__WRITE) {
+					write_assign_lang(result);
+				} else { // OP_CALL
+					stack.push(result.as_value());
+				}
+				
+#ifdef DEBUG_EXECUTE
+				debug_printf(sapi_info, "<-returned");
+#endif
+				//is_debug_junction=false;
 				break;
 			}
 
 		// expression ops: unary
 		case OP_NEG:
 			{
-				Value *operand=POP();
-				Value *value=NEW VDouble(pool(), -operand->get_double());
-				PUSH(value);
+				Value& a=stack.pop().value();
+				Value& value=*new VDouble(-a.as_double());
+				stack.push(value);
 				break;
 			}
 		case OP_INV:
 			{
-				Value *operand=POP();
-				Value *value=NEW VDouble(pool(), ~static_cast<int>(operand->get_double()));
-				PUSH(value);
+				Value& a=stack.pop().value();
+				Value& value=*new VDouble(~a.as_int());
+				stack.push(value);
 				break;
 			}
 		case OP_NOT:
 			{
-				Value *operand=POP();
-				Value *value=NEW VBool(pool(), !operand->get_bool());
-				PUSH(value);
+				Value& a=stack.pop().value();
+				Value& value=*new VBool(!a.as_bool());
+				stack.push(value);
 				break;
 			}
 		case OP_DEF:
 			{
-				Value *operand=POP();
-				Value *value=NEW VBool(pool(), operand->get_defined());
-				PUSH(value);
+				Value& a=stack.pop().value();
+				Value& value=*new VBool(a.is_defined());
+				stack.push(value);
 				break;
 			}
 		case OP_IN:
 			{
-				Value *operand=POP();
-				Value *value=NEW VBool(pool(), true/*TODO*/);
-				PUSH(value);
+				Value& a=stack.pop().value();
+				const String& path=a.as_string();
+				Value& value=*new VBool(request_info.uri && *request_info.uri && path.this_starts(request_info.uri));
+				stack.push(value);
 				break;
 			}
 		case OP_FEXISTS:
 			{
-				Value *operand=POP();
-				Value *value=NEW VBool(pool(), true/*TODO*/);
-				PUSH(value);
+				Value& a=stack.pop().value();
+				Value& value=*new VBool(file_readable(absolute(a.as_string())));
+				stack.push(value);
+				break;
+			}
+		case OP_DEXISTS:
+			{
+				Value& a=stack.pop().value();
+				Value& value=*new VBool(dir_readable(absolute(a.as_string())));
+				stack.push(value);
 				break;
 			}
 
 		// expression ops: binary
 		case OP_SUB: 
 			{
-				Value *b=POP();  Value *a=POP();
-				Value *value=NEW VDouble(pool(), a->get_double() - b->get_double());
-				PUSH(value);
+				Value& b=stack.pop().value();  Value& a=stack.pop().value();
+				Value& value=*new VDouble(a.as_double() - b.as_double());
+				stack.push(value);
 				break;
 			}
 		case OP_ADD: 
 			{
-				Value *b=POP();  Value *a=POP();
-				Value *value=NEW VDouble(pool(), a->get_double() + b->get_double());
-				PUSH(value);
+				Value& b=stack.pop().value();  Value& a=stack.pop().value();
+				Value& value=*new VDouble(a.as_double() + b.as_double());
+				stack.push(value);
 				break;
 			}
 		case OP_MUL: 
 			{
-				Value *b=POP();  Value *a=POP();
-				Value *value=NEW VDouble(pool(), a->get_double() * b->get_double());
-				PUSH(value);
+				Value& b=stack.pop().value();  Value& a=stack.pop().value();
+				Value& value=*new VDouble(a.as_double() * b.as_double());
+				stack.push(value);
 				break;
 			}
 		case OP_DIV: 
 			{
-				Value *b=POP();  Value *a=POP();
-				Value *value=NEW VDouble(pool(), a->get_double() / b->get_double());
-				PUSH(value);
+				Value& b=stack.pop().value();  Value& a=stack.pop().value();
+
+				double a_double=a.as_double();
+				double b_double=b.as_double();
+
+				if(b_double == 0) {
+					//const String* problem_source=b.as_string();
+					throw Exception("number.zerodivision",
+						0, //problem_source,
+						"Division by zero");
+				}
+
+				Value& value=*new VDouble(a_double / b_double);
+				stack.push(value);
 				break;
 			}
 		case OP_MOD: 
 			{
-				Value *b=POP();  Value *a=POP();
-				Value *value=NEW VDouble(pool(), 
-					static_cast<int>(a->get_double()) %
-					static_cast<int>(b->get_double()));
-				PUSH(value);
+				Value& b=stack.pop().value();  Value& a=stack.pop().value();
+
+				double a_double=a.as_double();
+				double b_double=b.as_double();
+
+				if(b_double == 0) {
+					//const String* problem_source=b.as_string();
+					throw Exception("number.zerodivision",
+						0, //problem_source,
+						"Modulus by zero");
+				}
+
+				Value& value=*new VDouble(fmod(a_double, b_double));
+				stack.push(value);
+				break;
+			}
+		case OP_INTDIV:
+			{
+				Value& b=stack.pop().value();  Value& a=stack.pop().value();
+
+				int a_int=a.as_int();
+				int b_int=b.as_int();
+
+				if(b_int == 0) {
+					//const String* problem_source=b.as_string();
+					throw Exception("number.zerodivision",
+						0, //problem_source,
+						"Division by zero");
+				}
+
+				Value& value=*new VInt(a_int / b_int);
+				stack.push(value);
+				break;
+			}
+		case OP_BIN_SL:
+			{
+				Value& b=stack.pop().value();  Value& a=stack.pop().value();
+				Value& value=*new VInt(
+					a.as_int() <<
+					b.as_int());
+				stack.push(value);
+				break;
+			}
+		case OP_BIN_SR:
+			{
+				Value& b=stack.pop().value();  Value& a=stack.pop().value();
+				Value& value=*new VInt(
+					a.as_int() >>
+					b.as_int());
+				stack.push(value);
 				break;
 			}
 		case OP_BIN_AND:
 			{
-				Value *b=POP();  Value *a=POP();
-				Value *value=NEW VDouble(pool(), 
-					static_cast<int>(a->get_double()) &
-					static_cast<int>(b->get_double()));
-				PUSH(value);
+				Value& b=stack.pop().value();  Value& a=stack.pop().value();
+				Value& value=*new VInt(
+					a.as_int() &
+					b.as_int());
+				stack.push(value);
 				break;
 			}
 		case OP_BIN_OR:
 			{
-				Value *b=POP();  Value *a=POP();
-				Value *value=NEW VDouble(pool(), 
-					static_cast<int>(a->get_double()) |
-					static_cast<int>(b->get_double()));
-				PUSH(value);
+				Value& b=stack.pop().value();  Value& a=stack.pop().value();
+				Value& value=*new VInt(
+					a.as_int() |
+					b.as_int());
+				stack.push(value);
 				break;
 			}
 		case OP_BIN_XOR:
 			{
-				Value *b=POP();  Value *a=POP();
-				Value *value=NEW VDouble(pool(), 
-					static_cast<int>(a->get_double()) ^
-					static_cast<int>(b->get_double()));
-				PUSH(value);
+				Value& b=stack.pop().value();  Value& a=stack.pop().value();
+				Value& value=*new VInt(
+					a.as_int() ^
+					b.as_int());
+				stack.push(value);
 				break;
 			}
 		case OP_LOG_AND:
 			{
-				Value *b=POP();  Value *a=POP();
-				Value *value=NEW VBool(pool(), a->get_bool() && b->get_bool());
-				PUSH(value);
+				ArrayOperation& local_ops=stack.pop().ops();  Value& a=stack.pop().value();
+				bool result;
+				if(a.as_bool()) {
+					execute(local_ops);
+					Value& b=stack.pop().value();
+					result=b.as_bool();
+				} else
+					result=false;
+				Value& value=*new VBool(result);
+				stack.push(value);
 				break;
 			}
 		case OP_LOG_OR:
 			{
-				Value *b=POP();  Value *a=POP();
-				Value *value=NEW VBool(pool(), a->get_bool() || b->get_bool());
-				PUSH(value);
+				ArrayOperation& local_ops=stack.pop().ops();  Value& a=stack.pop().value();
+				bool result;
+				if(a.as_bool()) 
+					result=true;
+				else {
+					execute(local_ops);
+					Value& b=stack.pop().value();
+					result=b.as_bool();
+				}
+				Value& value=*new VBool(result);
+				stack.push(value);
 				break;
 			}
 		case OP_LOG_XOR:
 			{
-				Value *b=POP();  Value *a=POP();
-				Value *value=NEW VBool(pool(), a->get_bool() ^ b->get_bool());
-				PUSH(value);
+				Value& b=stack.pop().value();  Value& a=stack.pop().value();
+				Value& value=*new VBool(a.as_bool() ^ b.as_bool());
+				stack.push(value);
 				break;
 			}
 		case OP_NUM_LT: 
 			{
-				Value *b=POP();  Value *a=POP();
-				Value *value=NEW VBool(pool(), a->get_double() < b->get_double());
-				PUSH(value);
+				volatile double b_double=stack.pop().value().as_double();
+				volatile double a_double=stack.pop().value().as_double();
+				Value& value=*new VBool(a_double<b_double);
+				stack.push(value);
 				break;
 			}
 		case OP_NUM_GT: 
 			{
-				Value *b=POP();  Value *a=POP();
-				Value *value=NEW VBool(pool(), a->get_double() > b->get_double());
-				PUSH(value);
+				volatile double b_double=stack.pop().value().as_double();
+				volatile double a_double=stack.pop().value().as_double();
+				Value& value=*new VBool(a_double>b_double);
+				stack.push(value);
 				break;
 			}
 		case OP_NUM_LE: 
 			{
-				Value *b=POP();  Value *a=POP();
-				Value *value=NEW VBool(pool(), a->get_double() <= b->get_double());
-				PUSH(value);
+				volatile double b_double=stack.pop().value().as_double();
+				volatile double a_double=stack.pop().value().as_double();
+				Value& value=*new VBool(a_double<=b_double);
+				stack.push(value);
 				break;
 			}
 		case OP_NUM_GE: 
 			{
-				Value *b=POP();  Value *a=POP();
-				Value *value=NEW VBool(pool(), a->get_double() >= b->get_double());
-				PUSH(value);
+				volatile double b_double=stack.pop().value().as_double();
+				volatile double a_double=stack.pop().value().as_double();
+				Value& value=*new VBool(a_double>=b_double);
+				stack.push(value);
 				break;
 			}
 		case OP_NUM_EQ: 
 			{
-				Value *b=POP();  Value *a=POP();
-				Value *value=NEW VBool(pool(), a->get_double() == b->get_double());
-				PUSH(value);
+				volatile double b_double=stack.pop().value().as_double();
+				volatile double a_double=stack.pop().value().as_double();
+				Value& value=*new VBool(a_double==b_double);
+				stack.push(value);
 				break;
 			}
 		case OP_NUM_NE: 
 			{
-				Value *b=POP();  Value *a=POP();
-				Value *value=NEW VBool(pool(), a->get_double() != b->get_double());
-				PUSH(value);
+				volatile double b_double=stack.pop().value().as_double();
+				volatile double a_double=stack.pop().value().as_double();
+				Value& value=*new VBool(a_double!=b_double);
+				stack.push(value);
 				break;
 			}
 		case OP_STR_LT: 
 			{
-				Value *b=POP();  Value *a=POP();
-				Value *value=NEW VBool(pool(), a->as_string() < b->as_string());
-				PUSH(value);
+				Value& b=stack.pop().value();  Value& a=stack.pop().value();
+				Value& value=*new VBool(a.as_string() < b.as_string());
+				stack.push(value);
 				break;
 			}
 		case OP_STR_GT: 
 			{
-				Value *b=POP();  Value *a=POP();
-				Value *value=NEW VBool(pool(), a->as_string() > b->as_string());
-				PUSH(value);
+				Value& b=stack.pop().value();  Value& a=stack.pop().value();
+				Value& value=*new VBool(a.as_string() > b.as_string());
+				stack.push(value);
 				break;
 			}
 		case OP_STR_LE: 
 			{
-				Value *b=POP();  Value *a=POP();
-				Value *value=NEW VBool(pool(), a->as_string() <= b->as_string());
-				PUSH(value);
+				Value& b=stack.pop().value();  Value& a=stack.pop().value();
+				Value& value=*new VBool(a.as_string() <= b.as_string());
+				stack.push(value);
 				break;
 			}
 		case OP_STR_GE: 
 			{
-				Value *b=POP();  Value *a=POP();
-				Value *value=NEW VBool(pool(), a->as_string() >= b->as_string());
-				PUSH(value);
+				Value& b=stack.pop().value();  Value& a=stack.pop().value();
+				Value& value=*new VBool(a.as_string() >= b.as_string());
+				stack.push(value);
 				break;
 			}
 		case OP_STR_EQ: 
 			{
-				Value *b=POP();  Value *a=POP();
-				Value *value=NEW VBool(pool(), a->as_string() == b->as_string());
-				PUSH(value);
+				Value& b=stack.pop().value();  Value& a=stack.pop().value();
+				Value& value=*new VBool(a.as_string() == b.as_string());
+				stack.push(value);
 				break;
 			}
 		case OP_STR_NE: 
 			{
-				Value *b=POP();  Value *a=POP();
-				Value *value=NEW VBool(pool(), a->as_string() != b->as_string());
-				PUSH(value);
+				Value& b=stack.pop().value();  Value& a=stack.pop().value();
+				Value& value=*new VBool(a.as_string() != b.as_string());
+				stack.push(value);
+				break;
+			}
+		case OP_IS:
+			{
+				Value& b=stack.pop().value();  Value& a=stack.pop().value();
+				Value& value=*new VBool(a.is(b.as_string().cstr()));
+				stack.push(value);
 				break;
 			}
 
 		default:
-			THROW(0,0,
+			throw Exception(0,
 				0,
-				"unhandled '%s' opcode", opcode_name[op.code]); 
+				"invalid opcode %d", opcode); 
 		}
-		fprintf(stderr, "\n");
+	}
+	} catch(...) {
+		// record it to stack trace
+		if(debug_name)
+			exception_trace.push(Trace(debug_name, debug_origin));
+		rethrow;
 	}
 }
 
-Value *Request::get_element() {
-	const String& name=POP_NAME();
-	Value *ncontext=POP();
-	Value *value=ncontext->get_element(name);
+/**
+	@todo cache|prepare junctions
+	@bug ^superbase:method would dynamically call ^base:method if there is any
+*/
+Value& Request::get_element(Value& ncontext, const String& name, bool can_call_operator) {
+	Value* value=0;
+	if(can_call_operator) {
+		if(Method* method=main_class.get_method(name)) // looking operator of that name FIRST
+			value=new VJunction(new Junction(
+				main_class, method, 0,0,0, 0));
+	}
+	if(!value) {
+		if(!wcontext->get_constructing() // not constructing
+			&& wcontext->get_somebody_entered_some_class() ) // ^class:method
+			if(VStateless_class *called_class=ncontext.get_class())
+				if(VStateless_class *read_class=rcontext->get_class())
+					if(read_class->derived_from(*called_class)) // current derived from called
+						if(Value* base=get_self().base()) { // doing DYNAMIC call
+							Temp_derived temp_derived(*base, 0); // temporarily prevent go-back-down virtual calls
+							value=base->get_element(name, *base, false); // virtual-up lookup starting from parent
+							goto value_ready;
+						}
+	}
+	if(!value)
+		value=ncontext.get_element(name, ncontext, false);
 
+	if(value && wcontext->get_constructing())
+		if(Junction* junction=value->get_junction()) {
+			if(junction->self.get_class()!=&ncontext)
+				throw Exception("parser.runtime",
+					&name,
+					"constructor must be declared in class '%s'", 
+						ncontext.get_class()->name_cstr());
+		}
+
+value_ready:
 	if(value)
-		value=&autocalc(*value); // autocalc possible code-junction
-	else {
-		value=NEW VUnknown(pool());
-		value->set_name(name);
-	}
+		value=&process_to_value(*value); // process possible code-junction
+	else
+		value=new VVoid;
 
-	return value;
+	return *value;
 }
 
-Value& Request::autocalc(Value& value, bool make_string) {
-	Junction *junction=value.get_junction();
+/**	@param intercept_string
+	- true:
+		they want result=string value, 
+		possible object result goes to wcontext
+	- false:
+		they want any result[string|object]
+		nothing goes to wcontext.
+		used in @c (expression) params evaluation
+
+    using the fact it's either string_ or value_ result requested to speed up checkes
+*/
+StringOrValue Request::process(Value& input_value, bool intercept_string) {
+	StringOrValue result;
+	Junction* junction=input_value.get_junction();
 	if(junction && junction->code) { // is it a code-junction?
-		// autocalc it
-		fprintf(stderr, "ja->\n");
-		PUSH(self);  
-		PUSH(root);  
-		PUSH(rcontext);  
-		PUSH(wcontext);
+		// process it
+#ifdef DEBUG_EXECUTE
+		debug_printf(sapi_info, "ja->\n");
+#endif
+
+		if(!junction->method_frame)
+			throw Exception("parser.runtime",
+				0,
+				"junction used outside of context");
+
+		VMethodFrame *saved_method_frame=method_frame;  
+		Value* saved_rcontext=rcontext;  
+		WContext *saved_wcontext=wcontext;
 		
-		WContext *frame;
-		if(make_string) {
+		method_frame=junction->method_frame;
+		rcontext=junction->rcontext;
+
+		// for expression method params
+		// wcontext is set 0
+		// using the fact in decision "which wwrapper to use"
+		bool using_code_frame=intercept_string && junction->wcontext;
+		if(using_code_frame) {
 			// almost plain wwrapper about junction wcontext, 
 			// BUT intercepts string writes
-			frame=NEW VCodeFrame(pool(), *junction->wcontext);  
-		} else {
-			// plain wwrapper
-			frame=NEW WWrapper(pool(), 0 /* empty */, false /*not constructing*/);
-		}
-		
-		wcontext=frame;
-		self=&junction->self;
-		root=junction->root;
-		rcontext=junction->rcontext;
-		execute(*junction->code);
-		Value *result;
-		if(make_string) {
+			VCodeFrame local(*junction->wcontext, junction->wcontext);
+			wcontext=&local;
+
+			// execute it
+			recoursion_checked_execute(/*0/*result_name* /, */ *junction->code);
+			
 			// CodeFrame soul:
 			//   string writes were intercepted
 			//   returning them as the result of getting code-junction
-			result=NEW VString(*frame->get_string());
-		} else 
-			result=frame->result();
+			result.set_string(*wcontext->get_string());
+		} else {
+			// plain wwrapper
+			WWrapper local(0/*empty*/, wcontext);
+			wcontext=&local;
+		
+			// execute it
+			recoursion_checked_execute(/*0/*result_name* /, */ *junction->code);
 		
-		wcontext=static_cast<WContext *>(POP());  
-		rcontext=POP();  
-		root=POP();  
-		self=static_cast<VAliased *>(POP());
+			result=wcontext->result();
+		}
 		
-		fprintf(stderr, "<-ja returned");
-		return *result;
-	} else
-		return value;
+		wcontext=saved_wcontext;
+		rcontext=saved_rcontext;
+		method_frame=saved_method_frame;
+		
+#ifdef DEBUG_EXECUTE
+		debug_printf(sapi_info, "<-ja returned");
+#endif
+	} else {
+		result.set_value(input_value);
+	}
+	return result;
+}
+
+StringOrValue Request::execute_method(VMethodFrame& amethod_frame, const Method& method) {
+	VMethodFrame *saved_method_frame=method_frame;  
+	Value* saved_rcontext=rcontext;  
+	WContext *saved_wcontext=wcontext;
+	
+	// initialize contexts
+	rcontext=wcontext=method_frame=&amethod_frame;
+	
+	// execute!	
+	execute(*method.parser_code);
+	
+	// result
+	StringOrValue result=wcontext->result();
+	
+	wcontext=saved_wcontext;
+	rcontext=saved_rcontext;
+	method_frame=saved_method_frame;
+	
+	// return
+	return result;
+}
+
+const String* Request::execute_method(Value& aself, 
+				      const Method& method, VString* optional_param,
+				      bool do_return_string) {
+	VMethodFrame *saved_method_frame=method_frame;  
+	Value* saved_rcontext=rcontext;  
+	WContext *saved_wcontext=wcontext;
+	
+	Junction local_junction(aself, &method, 0,0,0, 0);
+	VMethodFrame local_frame(local_junction, method_frame/*caller*/);
+	if(optional_param && local_frame.can_store_param()) {
+		local_frame.store_param(*optional_param);
+		local_frame.fill_unspecified_params();
+	}
+	local_frame.set_self(aself);
+	rcontext=wcontext=method_frame=&local_frame; 
+
+	// prevent non-string writes for better error reporting
+	if(do_return_string)
+		wcontext->write(local_frame);
+	
+	// execute!	
+	execute(*method.parser_code);
+	
+	// result
+	const String* result=0;
+	if(do_return_string)
+		result=&wcontext->result().as_string();
+	
+	wcontext=saved_wcontext;
+	rcontext=saved_rcontext;
+	method_frame=saved_method_frame;
+
+	return result;
+}
+
+Request::Execute_nonvirtual_method_result 
+Request::execute_nonvirtual_method(VStateless_class& aclass, 
+				   const String& method_name, VString* optional_param,
+				   bool do_return_string) {
+	Execute_nonvirtual_method_result result;
+	result.method=aclass.get_method(method_name);
+	if(result.method)
+		result.string=execute_method(aclass, *result.method, optional_param, 
+			do_return_string);
+	return result;
+}
+
+const String* Request::execute_virtual_method(Value& aself, 
+					      const String& method_name) {
+	if(Value* value=aself.get_element(method_name, aself, false))
+		if(Junction* junction=value->get_junction())
+			if(const Method *method=junction->method) 
+				return execute_method(aself, *method, 0/*no params*/, true);
+			
+	return 0;
 }