--- parser3/src/main/execute.C	2001/03/06 15:30:49	1.54
+++ parser3/src/main/execute.C	2002/04/22 10:15:12	1.239
@@ -1,141 +1,173 @@
-/*
-  $Id: execute.C,v 1.54 2001/03/06 15:30:49 paf Exp $
+/** @file
+	Parser: executor part of request class.
+
+	Copyright (c) 2001, 2002 ArtLebedev Group (http://www.artlebedev.com)
+	Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
+
+	$Id: execute.C,v 1.239 2002/04/22 10:15:12 paf Exp $
 */
 
+#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 DEBUG_EXECUTE
+//#define DEBUG_STRING_APPENDS_VS_EXPANDS
 
-#define PUSH(value) stack.push(value)
-#define POP() static_cast<Value *>(stack.pop())
-#define POP_NAME() static_cast<Value *>(stack.pop())->as_string()
 
+#ifdef DEBUG_STRING_APPENDS_VS_EXPANDS
+ulong wcontext_result_size=0;
+#endif
 
+
+
+#ifdef DEBUG_EXECUTE
 char *opcode_name[]={
 	// literals
-	"VALUE",  "CODE",  "CLASS",
+	"VALUE",  "CURLY_CODE__STORE_PARAM",  "EXPR_CODE__STORE_PARAM",
+	"NESTED_CODE",
 
 	// actions
-	"WITH_SELF",	"WITH_ROOT",	"WITH_READ",	"WITH_WRITE",
-	"CONSTRUCT",
-	"WRITE",
-	"GET_ELEMENT",	"GET_ELEMENT__WRITE",
-	"CREATE_EWPOOL",	"REDUCE_EWPOOL",
-	"CREATE_RWPOOL",	"REDUCE_RWPOOL",
-  	"CREATE_SWPOOL",	"REDUCE_SWPOOL",
-	"GET_METHOD_FRAME",
+	"WITH_ROOT",	"WITH_SELF",	"WITH_READ",	"WITH_WRITE",
+	"GET_CLASS",
+	"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",
-	"BIN_AND", "BIN_OR",
-	"LOG_AND", "LOG_OR",
+	"SUB", "ADD", "MUL", "DIV", "MOD", "INTDIV",
+	"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",
-	"XOR"
+	"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(Pool& pool, const char *fmt,va_list args) {
+	char buf[MAX_STRING];
+	vsnprintf(buf, MAX_STRING, fmt, args);
+	SAPI::log(pool, "%s", buf);
+}
+
+void debug_printf(Pool& pool, const char *fmt, ...) {
+    va_list args;
+    va_start(args,fmt);
+    va_debug_printf(pool,fmt,args);
+    va_end(args);
+}
 
-	int size=ops.size();
-	//fprintf(stderr, "size=%d\n", size);
-	for(int i=0; i<size; i++) {
+void debug_dump(Pool& pool, int level, const Array& ops) {
+	Array_iter i(ops);
+	while(i.has_next()) {
 		Operation op;
-		op.cast=ops.quick_get(i);
-		fprintf(stderr, "%*s%s", level*4, "", opcode_name[op.code]);
+		op.cast=i.next();
 
-		if(op.code==OP_VALUE) {
-			Value *value=static_cast<Value *>(ops.quick_get(++i));
-			fprintf(stderr, " \"%s\" %s", value->get_string()->cstr(), value->type());
-		}
-		if(op.code==OP_CLASS) {
-			VClass *vclass=static_cast<VClass *>(ops.quick_get(++i));
-			fprintf(stderr, " \"%s\"", vclass->name().cstr());
+		if(op.code==OP_VALUE || op.code==OP_STRING__WRITE) {
+			Value *value=static_cast<Value *>(i.next());
+			debug_printf(pool, 
+				"%*s%s"
+				" \"%s\" %s", 
+				level*4, "", opcode_name[op.code],
+				value->get_string()->cstr(), value->type());
+			continue;
 		}
-		fprintf(stderr, "\n");
+		debug_printf(pool, "%*s%s", level*4, "", opcode_name[op.code]);
 
-		if(op.code==OP_CODE) {
-			const Array *local_ops=reinterpret_cast<const Array *>(ops.quick_get(++i));
-			dump(level+1, *local_ops);
+		switch(op.code) {
+		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:
+			const Array *local_ops=reinterpret_cast<const Array *>(i.next());
+			debug_dump(pool, level+1, *local_ops);
 		}
 	}
 }
+#endif
+
+#define PUSH(value) stack.push(value)
+#define POP() static_cast<Value *>(stack.pop())
+#define POP_NAME() static_cast<Value *>(stack.pop())->as_string()
+#define POP_CODE() static_cast<Array *>(stack.pop())
 
 void Request::execute(const Array& ops) {
-	if(1) {
-		fputs("source----------------------------\n", stderr);
-		dump(0, ops);
-		fputs("execution-------------------------\n", stderr);
-	}
+//	_asm int 3;
+#ifdef DEBUG_EXECUTE
+	debug_printf(pool(), "source----------------------------\n");
+	debug_dump(pool(), 0, ops);
+	debug_printf(pool(), "execution-------------------------\n");
+#endif
 
-	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(), opcode_name[op.code]);
+	const String *last_get_element_name=0;
 
+	Array_iter i(ops);
+	while(i.has_next()) {
+		Operation op;
+		op.cast=i.next();
+#ifdef DEBUG_EXECUTE
+		debug_printf(pool(), "%d:%s", stack.top_index()+1, opcode_name[op.code]);
+#endif
+
+		Value *value;
+		Value *a; Value *b;
+		Array *b_code;
 		switch(op.code) {
 		// 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());
+				value=static_cast<Value *>(i.next());
+#ifdef DEBUG_EXECUTE
+				debug_printf(pool(), " \"%s\" %s", value->get_string()->cstr(), value->type());
+#endif
 				PUSH(value);
 				break;
 			}
-		case OP_CODE:
+		case OP_GET_CLASS:
 			{
-				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,rcontext,wcontext,local_ops);
-				
-				Value *value=NEW VJunction(j);
+				// maybe they do ^class:method[] call, remember the fact
+				wcontext->set_somebody_entered_some_class();
+
+				const String& name=POP_NAME();
+				value=static_cast<Value *>(classes().get(name));
+				if(!value) 
+					throw Exception("parser.runtime",
+						&name,
+						"class is undefined"); 
+
 				PUSH(value);
 				break;
 			}
-		case OP_CLASS:
-			{
-				VClass *vclass=static_cast<VClass *>(ops.quick_get(++i));
-				fprintf(stderr, " \"%s\"", vclass->name().cstr());
-		        PUSH(vclass);
-				break;
-			}
 			
 		// OP_WITH
-		case OP_WITH_SELF: 
+		case OP_WITH_ROOT:
 			{
-				PUSH(self);
+				PUSH(root);
 				break;
 			}
-		case OP_WITH_ROOT: 
+		case OP_WITH_SELF: 
 			{
-				PUSH(root);
+				PUSH(self);
 				break;
 			}
 		case OP_WITH_READ: 
@@ -150,261 +182,813 @@ void Request::execute(const Array& ops)
 			}
 			
 		// OTHER ACTIONS BUT WITHs
-		case OP_CONSTRUCT:
+		case OP_CONSTRUCT_VALUE:
 			{
-				Value *value=POP();
-				String& name=POP_NAME();
+				value=POP();
+				const String& name=POP_NAME();
 				Value *ncontext=POP();
-				value->set_name(name);
 				ncontext->put_element(name, value);
 				break;
 			}
-		case OP_WRITE:
+		case OP_CONSTRUCT_EXPR:
 			{
-				Value *value=POP();
-				wcontext->write(value);
+				// see OP_PREPARE_TO_EXPRESSION
+				wcontext->set_in_expression(false);
+
+				value=POP();
+				const String& name=POP_NAME();
+				Value *ncontext=POP();
+				ncontext->put_element(name, value->as_expr_result());
 				break;
 			}
-			
-		case OP_GET_ELEMENT:
+		case OP_CURLY_CODE__CONSTRUCT:
 			{
-				Value *value=get_element();
-				PUSH(value);
+				const Array *local_ops=reinterpret_cast<const Array *>(i.next());
+#ifdef DEBUG_EXECUTE
+				debug_printf(pool(), " (%d)\n", local_ops->size());
+				debug_dump(pool(), 1, *local_ops);
+#endif				
+				Junction& j=*NEW Junction(pool(), 
+					*self, 0, 0,
+					0, 
+					0, 
+					0, 
+					local_ops);
+
+				value=NEW VJunction(j);
+				const String& name=POP_NAME();
+				Value *ncontext=POP();
+				ncontext->put_element(name, value);
 				break;
 			}
-
-		case OP_GET_ELEMENT__WRITE:
+		case OP_NESTED_CODE:
 			{
-				Value *value=get_element();
-				wcontext->write(value);
+				Array *local_ops=static_cast<Array *>(i.next());
+#ifdef DEBUG_EXECUTE
+				debug_printf(pool(), " (%d)\n", local_ops->size());
+				debug_dump(pool(), 1, *local_ops);
+#endif				
+				PUSH(local_ops);
 				break;
 			}
-
-
-		case OP_CREATE_EWPOOL:
+		case OP_WRITE_VALUE:
 			{
-				PUSH(wcontext);
-				wcontext=NEW WWrapper(pool(), 0 /* empty */, true /* constructing */);
+				value=POP();
+				write_assign_lang(*value, last_get_element_name);
 				break;
 			}
-		case OP_REDUCE_EWPOOL:
+		case OP_WRITE_EXPR_RESULT:
 			{
-				Value *value=wcontext->result();
-				wcontext=static_cast<WContext *>(POP());
-				PUSH(value);
+				value=POP();
+				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_STRING__WRITE:
+			{
+				VString *vstring=static_cast<VString *>(i.next());
+#ifdef DEBUG_EXECUTE
+				debug_printf(pool(), " \"%s\"", vstring->string().cstr());
+#endif
+				write_no_lang(vstring->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 */);
+				// maybe they do ^object.method[] call, remember the fact
+				wcontext->set_somebody_entered_some_object(true);
+
+				//_asm int 3;
+				value=get_element(last_get_element_name, true);
+				PUSH(value);
 				break;
 			}
-		case OP_REDUCE_RWPOOL:
+		case OP_GET_ELEMENT:
 			{
-				String *string=wcontext->get_string();
-				Value *value=string?NEW VString(*string):NEW VString(pool());
-				wcontext=static_cast<WContext *>(POP());
-				rcontext=POP();
+				// maybe they do ^object.method[] call, remember the fact
+				wcontext->set_somebody_entered_some_object(true);
+
+				//_asm int 3;
+				value=get_element(last_get_element_name, false);
 				PUSH(value);
 				break;
 			}
-		case OP_CREATE_SWPOOL:
+
+		case OP_GET_ELEMENT__WRITE:
 			{
+				value=get_element(last_get_element_name/*not followed by call, not needed really*/, false);
+				write_assign_lang(*value, last_get_element_name);
+				break;
+			}
+
+
+		case OP_OBJECT_POOL:
+			{
+				const Array *local_ops=reinterpret_cast<const Array *>(i.next());
+				
 				PUSH(wcontext);
-				wcontext=NEW WWrapper(pool(), 0 /* empty */, false /* not constructing */);
+				PUSH((void *)flang);
+				flang=String::UL_PASS_APPENDED;
+				WWrapper local(pool(), 0 /*empty*/);
+				wcontext=&local;
+
+				execute(*local_ops);
+
+				value=&wcontext->result().as_value();
+				flang=static_cast<String::Untaint_lang>(reinterpret_cast<int>(POP()));
+				wcontext=static_cast<WContext *>(POP());
+				PUSH(value);
 				break;
 			}
-		case OP_REDUCE_SWPOOL:
+			
+		case OP_STRING_POOL:
 			{
+				const Array *local_ops=reinterpret_cast<const Array *>(i.next());
+
+				PUSH(wcontext);
+				WWrapper local(pool(), 0 /*empty*/);
+				wcontext=&local;
+
+				execute(*local_ops);
+
 				// from "$a $b" part of expression taking only string value,
 				// ignoring any other content of wcontext
-				String *string=wcontext->get_string();
-				Value *value=string?NEW VString(*string):NEW VString(pool());
+				const String *string=wcontext->get_string();
+				Value *value;
+				if(string)
+					value=NEW VString(*string);
+				else
+					NEW VVoid(pool());
 				wcontext=static_cast<WContext *>(POP());
 				PUSH(value);
 				break;
 			}
 
 		// CALL
-		case OP_GET_METHOD_FRAME:
+		case OP_STORE_PARAM:
 			{
-				Value *value=POP();
-				// [self/class?;params;local;code/native_code](name)
-				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()); 
-				//unless(method) method=operators.get_method[...;code/native_code](name)
-				VMethodFrame *frame=NEW VMethodFrame(pool(), *junction);
-				PUSH(frame);
+				value=POP();
+				VMethodFrame *frame=static_cast<VMethodFrame *>(stack.top_value());
+				// 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_STORE_PARAM:
+		case OP_CURLY_CODE__STORE_PARAM:
+		case OP_EXPR_CODE__STORE_PARAM:
 			{
-				Value *value=POP();
-				VMethodFrame *frame=static_cast<VMethodFrame *>(stack[0]);
+				// code
+				const Array *local_ops=reinterpret_cast<const Array *>(i.next());
+				VMethodFrame *frame=static_cast<VMethodFrame *>(stack.top_value());
+#ifdef DEBUG_EXECUTE
+				debug_printf(pool(), " (%d)\n", local_ops->size());
+				debug_dump(pool(), 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"
+				Junction& j=*NEW Junction(pool(), 
+					*self, 0, 0,
+					root, 
+					rcontext, 
+					op.code==OP_EXPR_CODE__STORE_PARAM?0:wcontext, 
+					local_ops);
+				
+				value=NEW VJunction(j);
+
+				// 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();
+				Array *local_ops=static_cast<Array *>(i.next());
+#ifdef DEBUG_EXECUTE
+				debug_printf(pool(), " (%d)\n", local_ops->size());
+				debug_dump(pool(), 1, *local_ops);
+
+				debug_printf(pool(), "->\n");
+#endif
+				value=POP();
+
+				// info: 
+				//	code compiled so that this one's always method-junction, 
+				//	not a code-junction
+				Junction *junction=value->get_junction();
+				if(!junction)
+					throw Exception("parser.runtime",
+						last_get_element_name, 
+						"(%s) not a method or junction, can not call it",
+							value->type());
+
+				VMethodFrame frame(pool(), *last_get_element_name, *junction);
+				if(local_ops){ // store param code goes here
+					PUSH(&frame); // argument for *STORE_PARAM ops
+					execute(*local_ops);
+					POP();
+				}
+				frame.fill_unspecified_params();
 				PUSH(self);  
 				PUSH(root);  
 				PUSH(rcontext);  
 				PUSH(wcontext); 
 				
-				VClass *called_class=frame->junction.self.get_class();
-				// constructing?
-				if(wcontext->constructing()) {  // yes
-					// constructor call: $some(^class:method(..))
-					frame->write(self=NEW VObject(pool(), *called_class));
-				} else {  // no
-					// context is 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
-						self=&frame->junction.self; // static or simple dynamic call
+				VStateless_class *called_class=frame.junction.self.get_class();
+				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(pool())) {
+							// some stateless_class creatable derivates
+							self=value;
+						} else 
+							throw Exception("parser.runtime",
+								&frame.name(),
+								"is not a constructor, system class '%s' can be constructed only implicitly", 
+								called_class->name().cstr());
+
+						frame.write(*self, 
+							String::UL_CLEAN  // not used, always an object, not string
+						);
+					} else
+						throw Exception("parser.runtime",
+							&frame.name(),
+							"method is static and can not be used as constructor");
+				} else {
+					// this is not constructor call
+
+					// not ^name.method call, name:method call; and
+					// is context object or class & is it my class or my parent's class and?
+					VStateless_class *read_class=rcontext->get_class();
+					if(
+						!(wcontext->get_somebody_entered_some_object() &&
+						!wcontext->get_somebody_entered_some_class()) && 
+						read_class && read_class->is_or_derived_from(*called_class)) // yes
+						self=rcontext; // dynamic call
+					else // no, not me or relative of mine (=total stranger)
+						self=&frame.junction.self; // static call
 				}
-				frame->set_self(*self);
-				root=rcontext=wcontext=frame;
+
+				frame.set_self(*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);
-					execute(frame->junction.method->code);
+					// and substitute class alias to the class they are called AS
+					Temp_alias temp_alias(*self->get_aliased(), *frame.junction.vclass);
+
+					const Method& method=*frame.junction.method;
+					Method::Call_type call_type=
+						called_class==self ? Method::CT_STATIC : Method::CT_DYNAMIC;
+					if(
+						method.call_type==Method::CT_ANY ||
+						method.call_type==call_type) { // allowed call type?
+						try {
+							if(method.native_code) { // native code?
+								// root unchanged, so that ^for ^foreach & co may write to locals
+								method.check_actual_numbered_params(
+									frame.junction.self, 
+									frame.name(), frame.numbered_params());
+								method.native_code(
+									*this, 
+									frame.name(), frame.numbered_params()); // execute it
+							} else { // parser code
+								root=&frame;
+								// execute it
+								recoursion_checked_execute(&frame.name(), *method.parser_code);
+							}
+						} catch(...) {
+							// record it to stack trace
+							exception_trace.push((void *)&frame.name());
+							/*re*/throw;
+						}
+					} else
+						throw Exception("parser.runtime",
+							&frame.name(),
+							"is not allowed to be called %s", 
+								call_type==Method::CT_STATIC?"statically":"dynamically");
+
 				}
-				Value *value=wcontext->result();
+				StringOrValue result=wcontext->result();
 
 				wcontext=static_cast<WContext *>(POP());  
 				rcontext=POP();  
 				root=POP();  
 				self=static_cast<VAliased *>(POP());
-				wcontext->write(value);
-				fprintf(stderr, "<-returned");
+
+#ifdef DEBUG_STRING_APPENDS_VS_EXPANDS
+				if(const String *s=value->get_string())
+					wcontext_result_size+=s->used_rows()*sizeof(String::Chunk::Row);
+#endif
+
+				if(op.code==OP_CALL__WRITE) {
+					write_assign_lang(result, last_get_element_name);
+					// forget the fact they've entered some ^object.method[].
+					// see OP_GET_ELEMENT
+					wcontext->set_somebody_entered_some_object(false);
+				} else { // OP_CALL
+					PUSH(&result.as_value());
+				}
+				
+#ifdef DEBUG_EXECUTE
+				debug_printf(pool(), "<-returned");
+#endif
 				break;
 			}
 
-		// EXPRESSION
-		case OP_ADD: 
+		// expression ops: unary
+		case OP_NEG:
 			{
-				Value *b=POP();
-				Value *a=POP();
-				Value *value=NEW VDouble(pool(), 
-					a->get_double() +
-					b->get_double());
+				Value *operand=POP();
+				value=NEW VDouble(pool(), -operand->as_double());
 				PUSH(value);
 				break;
 			}
-		case OP_SUB: 
+		case OP_INV:
 			{
-				Value *b=POP();
-				Value *a=POP();
-				Value *value=NEW VDouble(pool(), 
-					a->get_double() -
-					b->get_double());
+				Value *operand=POP();
+				value=NEW VDouble(pool(), ~operand->as_int());
 				PUSH(value);
 				break;
 			}
-		case OP_MUL: 
+		case OP_NOT:
 			{
-				Value *b=POP();
-				Value *a=POP();
-				Value *value=NEW VDouble(pool(), 
-					a->get_double() *
-					b->get_double());
+				Value *operand=POP();
+				value=NEW VBool(pool(), !operand->as_bool());
 				PUSH(value);
 				break;
 			}
-		case OP_DIV: 
+		case OP_DEF:
 			{
-				Value *b=POP();
-				Value *a=POP();
-				Value *value=NEW VDouble(pool(), 
-					a->get_double() /
-					b->get_double());
+				Value *operand=POP();
+				value=NEW VBool(pool(), operand->is_defined());
 				PUSH(value);
 				break;
 			}
-		case OP_NEG:
+		case OP_IN:
 			{
+				/// @test String::cmp
 				Value *operand=POP();
-				Value *value=NEW VDouble(pool(), -operand->get_double());
+				const char *path=operand->as_string().cstr();
+				value=NEW VBool(pool(), 
+					info.uri && strncmp(path, info.uri, strlen(path))==0);
 				PUSH(value);
 				break;
 			}
-		case OP_INV:
+		case OP_FEXISTS:
 			{
 				Value *operand=POP();
-				Value *value=NEW VDouble(pool(), 
-					~static_cast<int>(operand->get_double()));
+				value=NEW VBool(pool(), 
+					file_readable(absolute(operand->as_string())));
 				PUSH(value);
 				break;
 			}
-		case OP_NOT:
+		case OP_DEXISTS:
 			{
 				Value *operand=POP();
-				Value *value=NEW VBool(pool(), !operand->get_bool());
+				value=NEW VBool(pool(), 
+					dir_readable(absolute(operand->as_string())));
+				PUSH(value);
+				break;
+			}
+
+		// expression ops: binary
+		case OP_SUB: 
+			{
+				b=POP();  a=POP();
+				value=NEW VDouble(pool(), a->as_double() - b->as_double());
+				PUSH(value);
+				break;
+			}
+		case OP_ADD: 
+			{
+				b=POP();  a=POP();
+				value=NEW VDouble(pool(), a->as_double() + b->as_double());
+				PUSH(value);
+				break;
+			}
+		case OP_MUL: 
+			{
+				b=POP();  a=POP();
+				value=NEW VDouble(pool(), a->as_double() * b->as_double());
+				PUSH(value);
+				break;
+			}
+		case OP_DIV: 
+			{
+				b=POP();  a=POP();
+
+				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",
+						problem_source,
+						"Division by zero");
+				}
+
+				value=NEW VDouble(pool(), a_double / b_double);
+				PUSH(value);
+				break;
+			}
+		case OP_MOD: 
+			{
+				b=POP();  a=POP();
+
+				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",
+						problem_source,
+						"Modulus by zero");
+				}
+
+				value=NEW VDouble(pool(), fmod(a_double, b_double));
+				PUSH(value);
+				break;
+			}
+		case OP_INTDIV:
+			{
+				b=POP();  a=POP();
+
+				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",
+						problem_source,
+						"Division by zero");
+				}
+
+				value=NEW VInt(pool(), a_int / b_int);
+				PUSH(value);
+				break;
+			}
+		case OP_BIN_AND:
+			{
+				b=POP();  a=POP();
+				value=NEW VDouble(pool(), 
+					a->as_int() &
+					b->as_int());
+				PUSH(value);
+				break;
+			}
+		case OP_BIN_OR:
+			{
+				b=POP();  a=POP();
+				value=NEW VDouble(pool(), 
+					a->as_int() |
+					b->as_int());
+				PUSH(value);
+				break;
+			}
+		case OP_BIN_XOR:
+			{
+				b=POP();  a=POP();
+				value=NEW VDouble(pool(), 
+					a->as_int() ^
+					b->as_int());
+				PUSH(value);
+				break;
+			}
+		case OP_LOG_AND:
+			{
+				b_code=POP_CODE();  a=POP();
+				bool result;
+				if(a->as_bool()) {
+					execute(*b_code);
+					b=POP();
+					result=b->as_bool();
+				} else
+					result=false;
+				value=NEW VBool(pool(), result);
+				PUSH(value);
+				break;
+			}
+		case OP_LOG_OR:
+			{
+				b_code=POP_CODE();  a=POP();
+				bool result;
+				if(a->as_bool()) 
+					result=true;
+				else {
+					execute(*b_code);
+					b=POP();
+					result=b->as_bool();
+				}
+				value=NEW VBool(pool(), result);
+				PUSH(value);
+				break;
+			}
+		case OP_LOG_XOR:
+			{
+				b=POP();  a=POP();
+				value=NEW VBool(pool(), a->as_bool() ^ b->as_bool());
+				PUSH(value);
+				break;
+			}
+		case OP_NUM_LT: 
+			{
+				b=POP();  a=POP();
+				value=NEW VBool(pool(), a->as_double() < b->as_double());
+				PUSH(value);
+				break;
+			}
+		case OP_NUM_GT: 
+			{
+				b=POP();  a=POP();
+				value=NEW VBool(pool(), a->as_double() > b->as_double());
+				PUSH(value);
+				break;
+			}
+		case OP_NUM_LE: 
+			{
+				b=POP();  a=POP();
+				value=NEW VBool(pool(), a->as_double() <= b->as_double());
+				PUSH(value);
+				break;
+			}
+		case OP_NUM_GE: 
+			{
+				b=POP();  a=POP();
+				value=NEW VBool(pool(), a->as_double() >= b->as_double());
+				PUSH(value);
+				break;
+			}
+		case OP_NUM_EQ: 
+			{
+				b=POP();  a=POP();
+				value=NEW VBool(pool(), a->as_double() == b->as_double());
+				PUSH(value);
+				break;
+			}
+		case OP_NUM_NE: 
+			{
+				b=POP();  a=POP();
+				value=NEW VBool(pool(), a->as_double() != b->as_double());
+				PUSH(value);
+				break;
+			}
+		case OP_STR_LT: 
+			{
+				b=POP();  a=POP();
+				value=NEW VBool(pool(), a->as_string() < b->as_string());
+				PUSH(value);
+				break;
+			}
+		case OP_STR_GT: 
+			{
+				b=POP();  a=POP();
+				value=NEW VBool(pool(), a->as_string() > b->as_string());
+				PUSH(value);
+				break;
+			}
+		case OP_STR_LE: 
+			{
+				b=POP();  a=POP();
+				value=NEW VBool(pool(), a->as_string() <= b->as_string());
+				PUSH(value);
+				break;
+			}
+		case OP_STR_GE: 
+			{
+				b=POP();  a=POP();
+				value=NEW VBool(pool(), a->as_string() >= b->as_string());
+				PUSH(value);
+				break;
+			}
+		case OP_STR_EQ: 
+			{
+				b=POP();  a=POP();
+				value=NEW VBool(pool(), a->as_string() == b->as_string());
+				PUSH(value);
+				break;
+			}
+		case OP_STR_NE: 
+			{
+				b=POP();  a=POP();
+				value=NEW VBool(pool(), a->as_string() != b->as_string());
+				PUSH(value);
+				break;
+			}
+		case OP_IS:
+			{
+				//_asm int 3;
+				b=POP();  a=POP();
+				value=NEW VBool(pool(), b->as_string() == a->type());
 				PUSH(value);
 				break;
 			}
 
 		default:
-			fprintf(stderr, "\tTODO");
-			break;
+			throw Exception(0,
+				0,
+				"invalid opcode %d", op.code); 
 		}
-		fprintf(stderr, "\n");
 	}
 }
 
-Value *Request::get_element() {
-	String& name=POP_NAME();
+/// @test cache|prepare junctions 
+Value *Request::get_element(const String *& remember_name, bool can_call_operator) {
+	const String& name=POP_NAME();  remember_name=&name;
 	Value *ncontext=POP();
-	Value *value=ncontext->get_element(name);
+	Value *value=0;
+	if(can_call_operator)
+		if(Method* method=OP.get_method(name)) { // looking operator of that name FIRST
+			// as if that method were in self and we have normal dynamic method here
+			Junction& junction=*NEW Junction(pool(), 
+				*root, self->get_class(), method, 0,0,0,0);
+			value=NEW VJunction(junction);
+		}
+	if(!value)
+		value=ncontext->get_element(name);
+	if(value)
+		value=&process_to_value(*value); // process possible code-junction
+	else
+		value=NEW VVoid(pool());
 
-	if(value) {
-		Junction *junction=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);
+	return value;
+}
 
-			// almost plain wwrapper about junction wcontext, 
-			// BUT intercepts string writes
-			VCodeFrame frame(pool(), *junction->wcontext);  wcontext=&frame;
-			self=&junction->self;
+/**	@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?
+		// process it
+#ifdef DEBUG_EXECUTE
+		debug_printf(pool(), "ja->\n");
+#endif
+
+		PUSH(self);  
+		PUSH(root);  
+		PUSH(rcontext);  
+		PUSH(wcontext);
+
+		WContext *jwcontext;
+		self=&junction->self;
+		if(junction->root) {
 			root=junction->root;
 			rcontext=junction->rcontext;
-			execute(*junction->code);
+			jwcontext=junction->wcontext;
+		} else
+			jwcontext=wcontext;
+
+		// for expression method params
+		// wcontext is set 0
+		// using the fact in decision "which wwrapper to use"
+		bool using_code_frame=intercept_string && jwcontext;
+		if(using_code_frame) {
+			// almost plain wwrapper about junction wcontext, 
+			// BUT intercepts string writes
+			VCodeFrame local(pool(), *jwcontext);
+			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
-			value=NEW VString(*frame.get_string());
-
-			wcontext=static_cast<WContext *>(POP());  
-			rcontext=POP();  
-			root=POP();  
-			self=static_cast<VAliased *>(POP());
-			fprintf(stderr, "<-ja returned");
+			result.set_string(*wcontext->get_string());
+		} else {
+			// plain wwrapper
+			WWrapper local(pool(), 0/*empty*/);
+			wcontext=&local;
+		
+			// execute it
+			recoursion_checked_execute(0/*result_name*/, *junction->code);
+		
+			result=wcontext->result();
 		}
+		
+		wcontext=static_cast<WContext *>(POP());  
+		rcontext=POP();  
+		root=POP();  
+		self=static_cast<VAliased *>(POP());
+		
+#ifdef DEBUG_EXECUTE
+		debug_printf(pool(), "<-ja returned");
+#endif
 	} else {
-		value=NEW VUnknown(pool());
-		value->set_name(name);
+		result.set_value(input_value);
 	}
-	return value;
+	return result;
+}
+
+const String *Request::execute_method(Value& aself, const Method& method,
+		bool return_cstr) {
+	PUSH(self);  
+	PUSH(root);  
+	PUSH(rcontext);  
+	PUSH(wcontext);
+	
+	// initialize contexts
+	root=rcontext=self=&aself;
+	WWrapper local(pool(), &aself);
+	wcontext=&local; 
+	
+	// execute!	
+	execute(*method.parser_code);
+	
+	// result
+	const String *result=0;
+	if(return_cstr) {
+		if(Value *result_var_value=wcontext->get_element(*result_var_name))
+			result=&result_var_value->as_string();
+		else
+			result=&wcontext->as_string();
+	}
+	
+	wcontext=static_cast<WContext *>(POP());  
+	rcontext=POP();  
+	root=POP();  
+	self=static_cast<VAliased *>(POP());
+	
+	// return
+	return result;
+}
+
+const String& Request::execute_method(VMethodFrame& amethodFrame, const Method& method) {
+	PUSH(self);  
+	PUSH(root);  
+	PUSH(rcontext);  
+	PUSH(wcontext);
+	
+	// initialize contexts
+	root=rcontext=self=&amethodFrame;
+	wcontext=&amethodFrame;
+	
+	// execute!	
+	execute(*method.parser_code);
+	
+	// result
+	const String& result=wcontext->result().as_string();
+	
+	wcontext=static_cast<WContext *>(POP());  
+	rcontext=POP();  
+	root=POP();  
+	self=static_cast<VAliased *>(POP());
+	
+	// return
+	return result;
+}
+
+const String *Request::execute_virtual_method(Value& aself, 
+											  const String& method_name) {
+	if(Value *value=aself.get_element(method_name))
+		if(Junction *junction=value->get_junction())
+			if(const Method *method=junction->method) 
+				return execute_method(aself, *method, true /*return_cstr*/);
+			
+	return 0;
+}
+
+const String *Request::execute_nonvirtual_method(VStateless_class& aclass, 
+												 const String& method_name,
+												 bool return_cstr) {
+	if(const Method *method=aclass.get_method(method_name))
+		return execute_method(aclass, *method, return_cstr);
+
+	return 0;
 }