parser3/src/main/execute.C - diff

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Diff for /parser3/src/main/execute.C between versions 1.208 and 1.237

version 1.208, 2001/12/21 12:47:56	version 1.237, 2002/04/18 11:41:29
Line 1	Line 1
/** @file	/** @file
Parser: executor part of request class.	Parser: executor part of request class.

Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)	Copyright (c) 2001, 2002 ArtLebedev Group (http://www.artlebedev.com)
Author: Alexander Petrosyan <paf@design.ru> (http://paf.design.ru)	Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)

$Id$	$Id$
*/	*/
Line 24	Line 24
#include "pa_wwrapper.h"	#include "pa_wwrapper.h"

//#define DEBUG_EXECUTE	//#define DEBUG_EXECUTE
	//#define DEBUG_STRING_APPENDS_VS_EXPANDS


	#ifdef DEBUG_STRING_APPENDS_VS_EXPANDS
	ulong wcontext_result_size=0;
	#endif


const uint ANTI_ENDLESS_EXECUTE_RECOURSION=500;

#ifdef DEBUG_EXECUTE	#ifdef DEBUG_EXECUTE
char *opcode_name[]={	char *opcode_name[]={
// literals	// literals
"VALUE", "CURLY_CODE__STORE_PARAM", "EXPR_CODE__STORE_PARAM",	"VALUE", "CURLY_CODE__STORE_PARAM", "EXPR_CODE__STORE_PARAM",
	"NESTED_CODE",

// actions	// actions
"WITH_ROOT", "WITH_SELF", "WITH_READ", "WITH_WRITE",	"WITH_ROOT", "WITH_SELF", "WITH_READ", "WITH_WRITE",
"GET_CLASS",	"GET_CLASS",
"CONSTRUCT_VALUE", "CONSTRUCT_EXPR", "CURLY_CODE__CONSTRUCT",	"CONSTRUCT_VALUE", "CONSTRUCT_EXPR", "CURLY_CODE__CONSTRUCT",
"WRITE_VALUE", "WRITE_EXPR_RESULT", "STRING__WRITE",	"WRITE_VALUE", "WRITE_EXPR_RESULT", "STRING__WRITE",
"GET_ELEMENT", "GET_ELEMENT__WRITE",	"GET_ELEMENT_OR_OPERATOR", "GET_ELEMENT", "GET_ELEMENT__WRITE",
"CREATE_EWPOOL", "REDUCE_EWPOOL",	"OBJECT_POOL", "STRING_POOL",
"CREATE_SWPOOL", "REDUCE_SWPOOL",
"GET_METHOD_FRAME",
"STORE_PARAM",	"STORE_PARAM",
"PREPARE_TO_CONSTRUCT_OBJECT", "CALL",	"PREPARE_TO_CONSTRUCT_OBJECT", "PREPARE_TO_EXPRESSION",
	"CALL", "CALL__WRITE",

// expression ops: unary	// expression ops: unary
"NEG", "INV", "NOT", "DEF", "IN", "FEXISTS", "DEXISTS",	"NEG", "INV", "NOT", "DEF", "IN", "FEXISTS", "DEXISTS",
Line 89 void debug_dump(Pool& pool, int level, c	Line 95 void debug_dump(Pool& pool, int level, c
case OP_CURLY_CODE__STORE_PARAM:	case OP_CURLY_CODE__STORE_PARAM:
case OP_EXPR_CODE__STORE_PARAM:	case OP_EXPR_CODE__STORE_PARAM:
case OP_CURLY_CODE__CONSTRUCT:	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());	const Array local_ops=reinterpret_cast<const Array >(i.next());
debug_dump(pool, level+1, *local_ops);	debug_dump(pool, level+1, *local_ops);
}	}
Line 99 void debug_dump(Pool& pool, int level, c	Line 109 void debug_dump(Pool& pool, int level, c
#define PUSH(value) stack.push(value)	#define PUSH(value) stack.push(value)
#define POP() static_cast<Value *>(stack.pop())	#define POP() static_cast<Value *>(stack.pop())
#define POP_NAME() static_cast<Value *>(stack.pop())->as_string()	#define POP_NAME() static_cast<Value *>(stack.pop())->as_string()
	#define POP_CODE() static_cast<Array *>(stack.pop())

void Request::execute(const Array& ops) {	void Request::execute(const Array& ops) {
// _asm int 3;	// _asm int 3;
Line 108 void Request::execute(const Array& ops)	Line 119 void Request::execute(const Array& ops)
debug_printf(pool(), "execution-------------------------\n");	debug_printf(pool(), "execution-------------------------\n");
#endif	#endif

	const String *last_get_element_name=0;

Array_iter i(ops);	Array_iter i(ops);
while(i.has_next()) {	while(i.has_next()) {
Operation op;	Operation op;
Line 118 void Request::execute(const Array& ops)	Line 131 void Request::execute(const Array& ops)

Value *value;	Value *value;
Value a; Value b;	Value a; Value b;
	Array *b_code;
switch(op.code) {	switch(op.code) {
// param in next instruction	// param in next instruction
case OP_VALUE:	case OP_VALUE:
Line 129 void Request::execute(const Array& ops)	Line 143 void Request::execute(const Array& ops)
PUSH(value);	PUSH(value);
break;	break;
}	}
case OP_CURLY_CODE__STORE_PARAM:
case OP_EXPR_CODE__STORE_PARAM:
{
VMethodFrame frame=static_cast<VMethodFrame >(stack.top_value());
// code
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
// 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
frame->store_param(frame->name(), value);
break;
}
case OP_GET_CLASS:	case OP_GET_CLASS:
{	{
// maybe they do ^class:method[] call, remember the fact	// maybe they do ^class:method[] call, remember the fact
Line 167 void Request::execute(const Array& ops)	Line 151 void Request::execute(const Array& ops)
const String& name=POP_NAME();	const String& name=POP_NAME();
value=static_cast<Value *>(classes().get(name));	value=static_cast<Value *>(classes().get(name));
if(!value)	if(!value)
throw Exception(0,0,	throw Exception("parser.runtime",
&name,	&name,
"class is undefined");	"class is undefined");

Line 204 void Request::execute(const Array& ops)	Line 188 void Request::execute(const Array& ops)
const String& name=POP_NAME();	const String& name=POP_NAME();
Value *ncontext=POP();	Value *ncontext=POP();
ncontext->put_element(name, value);	ncontext->put_element(name, value);
value->set_name(name);
break;	break;
}	}
case OP_CONSTRUCT_EXPR:	case OP_CONSTRUCT_EXPR:
{	{
	// see OP_PREPARE_TO_EXPRESSION
	wcontext->set_in_expression(false);

value=POP();	value=POP();
const String& name=POP_NAME();	const String& name=POP_NAME();
Value *ncontext=POP();	Value *ncontext=POP();
ncontext->put_element(name, value->as_expr_result());	ncontext->put_element(name, value->as_expr_result());
value->set_name(name);
break;	break;
}	}
case OP_CURLY_CODE__CONSTRUCT:	case OP_CURLY_CODE__CONSTRUCT:
Line 234 void Request::execute(const Array& ops)	Line 219 void Request::execute(const Array& ops)
const String& name=POP_NAME();	const String& name=POP_NAME();
Value *ncontext=POP();	Value *ncontext=POP();
ncontext->put_element(name, value);	ncontext->put_element(name, value);
value->set_name(name);	break;
	}
	case OP_NESTED_CODE:
	{
	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;	break;
}	}
case OP_WRITE_VALUE:	case OP_WRITE_VALUE:
{	{
value=POP();	value=POP();
write_assign_lang(*value);	write_assign_lang(*value, last_get_element_name);

// forget the fact they've entered some ^object.method[].
// see OP_GET_ELEMENT
wcontext->set_somebody_entered_some_object(false);
break;	break;
}	}
case OP_WRITE_EXPR_RESULT:	case OP_WRITE_EXPR_RESULT:
{	{
value=POP();	value=POP();
write_expr_result(*value->as_expr_result());	write_no_lang(*value->as_expr_result());

	// must be after write(result) and
	// see OP_PREPARE_TO_EXPRESSION
	wcontext->set_in_expression(false);
break;	break;
}	}
case OP_STRING__WRITE:	case OP_STRING__WRITE:
Line 263 void Request::execute(const Array& ops)	Line 257 void Request::execute(const Array& ops)
break;	break;
}	}

	case OP_GET_ELEMENT_OR_OPERATOR:
	{
	// 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_GET_ELEMENT:	case OP_GET_ELEMENT:
{	{
// maybe they do ^object.method[] call, remember the fact	// maybe they do ^object.method[] call, remember the fact
wcontext->set_somebody_entered_some_object(true);	wcontext->set_somebody_entered_some_object(true);

//_asm int 3;	//_asm int 3;
value=get_element();	value=get_element(last_get_element_name, false);
PUSH(value);	PUSH(value);
break;	break;
}	}

case OP_GET_ELEMENT__WRITE:	case OP_GET_ELEMENT__WRITE:
{	{
value=get_element();	value=get_element(last_get_element_name/not followed by call, not needed really/, false);
write_assign_lang(*value);	write_assign_lang(*value, last_get_element_name);
break;	break;
}	}


case OP_CREATE_EWPOOL:	case OP_OBJECT_POOL:
{	{
	const Array local_ops=reinterpret_cast<const Array >(i.next());

PUSH(wcontext);	PUSH(wcontext);
PUSH((void *)flang);	PUSH((void *)flang);
flang=String::UL_PASS_APPENDED;	flang=String::UL_PASS_APPENDED;
wcontext=NEW WWrapper(pool(), 0 /empty/);	WWrapper local(pool(), 0 /empty/);
break;	wcontext=&local;
}
case OP_REDUCE_EWPOOL:	execute(*local_ops);
{
value=&wcontext->result();	value=&wcontext->result().as_value();
flang=static_cast<String::Untaint_lang>(reinterpret_cast<int>(POP()));	flang=static_cast<String::Untaint_lang>(reinterpret_cast<int>(POP()));
wcontext=static_cast<WContext *>(POP());	wcontext=static_cast<WContext *>(POP());
PUSH(value);	PUSH(value);
break;	break;
}	}

case OP_CREATE_SWPOOL:	case OP_STRING_POOL:
{	{
	const Array local_ops=reinterpret_cast<const Array >(i.next());

PUSH(wcontext);	PUSH(wcontext);
wcontext=NEW WWrapper(pool(), 0 /empty/);	WWrapper local(pool(), 0 /empty/);
break;	wcontext=&local;
}
case OP_REDUCE_SWPOOL:	execute(*local_ops);
{
// from "$a $b" part of expression taking only string value,	// from "$a $b" part of expression taking only string value,
// ignoring any other content of wcontext	// ignoring any other content of wcontext
const String *string=wcontext->get_string();	const String *string=wcontext->get_string();
Line 321 void Request::execute(const Array& ops)	Line 329 void Request::execute(const Array& ops)
}	}

// CALL	// CALL
case OP_GET_METHOD_FRAME:	case OP_STORE_PARAM:
{	{
value=POP();	value=POP();
	VMethodFrame frame=static_cast<VMethodFrame >(stack.top_value());
// info:	// this op is executed from CALL local_ops only, so can not check method_frame_to_fill==0
// code compiled so that this one's always method-junction,	frame->store_param(value);
// not a code-junction
Junction *junction=value->get_junction();
if(!junction)
throw Exception(0, 0,
&value->name(),
"(%s) not a method or junction, can not call it",
value->type());

VMethodFrame frame=NEW VMethodFrame(pool(), value->name(), junction);
PUSH(frame);
break;	break;
}	}
case OP_STORE_PARAM:	case OP_CURLY_CODE__STORE_PARAM:
	case OP_EXPR_CODE__STORE_PARAM:
{	{
value=POP();	// code
	const Array local_ops=reinterpret_cast<const Array >(i.next());
VMethodFrame frame=static_cast<VMethodFrame >(stack.top_value());	VMethodFrame frame=static_cast<VMethodFrame >(stack.top_value());
frame->store_param(frame->name(), 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;	break;
}	}

Line 352 void Request::execute(const Array& ops)	Line 374 void Request::execute(const Array& ops)
wcontext->set_constructing(true);	wcontext->set_constructing(true);
break;	break;
}	}

	case OP_PREPARE_TO_EXPRESSION:
	{
	wcontext->set_in_expression(true);
	break;
	}

case OP_CALL:	case OP_CALL:
	case OP_CALL__WRITE:
{	{
	Array local_ops=static_cast<Array >(i.next());
#ifdef DEBUG_EXECUTE	#ifdef DEBUG_EXECUTE
	debug_printf(pool(), " (%d)\n", local_ops->size());
	debug_dump(pool(), 1, *local_ops);

debug_printf(pool(), "->\n");	debug_printf(pool(), "->\n");
#endif	#endif
VMethodFrame frame=static_cast<VMethodFrame >(POP());	value=POP();
frame->fill_unspecified_params();
	// 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(self);
PUSH(root);	PUSH(root);
PUSH(rcontext);	PUSH(rcontext);
PUSH(wcontext);	PUSH(wcontext);

VStateless_class *called_class=frame->junction.self.get_class();	VStateless_class *called_class=frame.junction.self.get_class();
if(wcontext->get_constructing()) {	if(wcontext->get_constructing()) {
wcontext->set_constructing(false);	wcontext->set_constructing(false);
if(frame->junction.method->call_type!=Method::CT_STATIC) {	if(frame.junction.method->call_type!=Method::CT_STATIC) {
// this is a constructor call	// this is a constructor call

if(Value *value=called_class->create_new_value(pool())) {	if(Value *value=called_class->create_new_value(pool())) {
// some stateless_class creatable derivates	// some stateless_class creatable derivates
self=value;	self=value;
} else	} else
throw Exception(0, 0,	throw Exception("parser.runtime",
&frame->name(),	&frame.name(),
"is not a constructor, system class '%s' can be constructed only implicitly",	"is not a constructor, system class '%s' can be constructed only implicitly",
called_class->name().cstr());	called_class->name().cstr());

frame->write(*self,	frame.write(*self,
String::UL_CLEAN // not used, always an object, not string	String::UL_CLEAN // not used, always an object, not string
);	);
} else	} else
throw Exception(0, 0,	throw Exception("parser.runtime",
&frame->name(),	&frame.name(),
"method is static and can not be used as constructor");	"method is static and can not be used as constructor");
} else {	} else {
// this is not constructor call	// this is not constructor call
Line 398 void Request::execute(const Array& ops)	Line 449 void Request::execute(const Array& ops)
read_class && read_class->is_or_derived_from(*called_class)) // yes	read_class && read_class->is_or_derived_from(*called_class)) // yes
self=rcontext; // dynamic call	self=rcontext; // dynamic call
else // no, not me or relative of mine (=total stranger)	else // no, not me or relative of mine (=total stranger)
self=&frame->junction.self; // static call	self=&frame.junction.self; // static call
}	}

frame->set_self(*self);	frame.set_self(*self);
rcontext=wcontext=frame;
	// see OP_PREPARE_TO_EXPRESSION
	frame.set_in_expression(wcontext->get_in_expression());

	rcontext=wcontext=&frame;
{	{
// take object or class from any wrappers	// take object or class from any wrappers
// and substitute class alias to the class they are called AS	// and substitute class alias to the class they are called AS
Temp_alias temp_alias(self->get_aliased(), frame->junction.vclass);	Temp_alias temp_alias(self->get_aliased(), frame.junction.vclass);

const Method& method=*frame->junction.method;	const Method& method=*frame.junction.method;
Method::Call_type call_type=	Method::Call_type call_type=
called_class==self ? Method::CT_STATIC : Method::CT_DYNAMIC;	called_class==self ? Method::CT_STATIC : Method::CT_DYNAMIC;
if(	if(
Line 418 void Request::execute(const Array& ops)	Line 473 void Request::execute(const Array& ops)
if(method.native_code) { // native code?	if(method.native_code) { // native code?
// root unchanged, so that ^for ^foreach & co may write to locals	// root unchanged, so that ^for ^foreach & co may write to locals
method.check_actual_numbered_params(	method.check_actual_numbered_params(
frame->junction.self,	frame.junction.self,
frame->name(), frame->numbered_params());	frame.name(), frame.numbered_params());
method.native_code(	method.native_code(
*this,	*this,
frame->name(), frame->numbered_params()); // execute it	frame.name(), frame.numbered_params()); // execute it
} else { // parser code	} else { // parser code
root=frame;	root=&frame;
{ // anti_endless_execute_recoursion	// execute it
if(++anti_endless_execute_recoursion==ANTI_ENDLESS_EXECUTE_RECOURSION) {	recoursion_checked_execute(&frame.name(), *method.parser_code);
anti_endless_execute_recoursion=0; // give @exception a chance
throw Exception(0, 0,
&frame->name(),
"call canceled - endless recursion detected");
}
execute(*method.parser_code); // execute it
anti_endless_execute_recoursion--;
}
}	}
} catch(...) {	} catch(...) {
// record it to stack trace	// record it to stack trace
trace.push((void *)&frame->name());	exception_trace.push((void *)&frame.name());
/re/throw;	/re/throw;
}	}
} else	} else
throw Exception(0, 0,	throw Exception("parser.runtime",
&frame->name(),	&frame.name(),
"is not allowed to be called %s",	"is not allowed to be called %s",
call_type==Method::CT_STATIC?"statically":"dynamically");	call_type==Method::CT_STATIC?"statically":"dynamically");

}	}
value=&wcontext->result();	StringOrValue result=wcontext->result();

wcontext=static_cast<WContext *>(POP());	wcontext=static_cast<WContext *>(POP());
rcontext=POP();	rcontext=POP();
root=POP();	root=POP();
self=static_cast<VAliased *>(POP());	self=static_cast<VAliased *>(POP());

PUSH(value);	#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	#ifdef DEBUG_EXECUTE
debug_printf(pool(), "<-returned");	debug_printf(pool(), "<-returned");
#endif	#endif
Line 549 void Request::execute(const Array& ops)	Line 609 void Request::execute(const Array& ops)

if(b_double == 0) {	if(b_double == 0) {
const String *problem_source=&b->as_string();	const String *problem_source=&b->as_string();
#ifndef NO_STRING_ORIGIN	throw Exception("number.zerodivision",
if(!problem_source->origin().file)
problem_source=&b->name();
#endif
throw Exception(0, 0,
problem_source,	problem_source,
"Division by zero");	"Division by zero");
}	}
Line 571 void Request::execute(const Array& ops)	Line 627 void Request::execute(const Array& ops)

if(b_double == 0) {	if(b_double == 0) {
const String *problem_source=&b->as_string();	const String *problem_source=&b->as_string();
#ifndef NO_STRING_ORIGIN	throw Exception("number.zerodivision",
if(!problem_source->origin().file)
problem_source=&b->name();
#endif
throw Exception(0, 0,
problem_source,	problem_source,
"Modulus by zero");	"Modulus by zero");
}	}
Line 593 void Request::execute(const Array& ops)	Line 645 void Request::execute(const Array& ops)

if(b_int == 0) {	if(b_int == 0) {
const String *problem_source=&b->as_string();	const String *problem_source=&b->as_string();
#ifndef NO_STRING_ORIGIN	throw Exception("number.zerodivision",
if(!problem_source->origin().file)
problem_source=&b->name();
#endif
throw Exception(0, 0,
problem_source,	problem_source,
"Division by zero");	"Division by zero");
}	}
Line 635 void Request::execute(const Array& ops)	Line 683 void Request::execute(const Array& ops)
}	}
case OP_LOG_AND:	case OP_LOG_AND:
{	{
b=POP(); a=POP();	b_code=POP_CODE(); a=POP();
value=NEW VBool(pool(), a->as_bool() && b->as_bool());	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);	PUSH(value);
break;	break;
}	}
case OP_LOG_OR:	case OP_LOG_OR:
{	{
b=POP(); a=POP();	b_code=POP_CODE(); a=POP();
value=NEW VBool(pool(), a->as_bool() \|\| b->as_bool());	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);	PUSH(value);
break;	break;
}	}
Line 748 void Request::execute(const Array& ops)	Line 811 void Request::execute(const Array& ops)
}	}

default:	default:
throw Exception(0,0,	throw Exception(0,
0,	0,
"invalid opcode %d", op.code);	"invalid opcode %d", op.code);
}	}
}	}
}	}

Value *Request::get_element() {	/// @test cache\|prepare junctions
const String& name=POP_NAME();	Value Request::get_element(const String & remember_name, bool can_call_operator) {
	const String& name=POP_NAME(); remember_name=&name;
Value *ncontext=POP();	Value *ncontext=POP();
Value *value=ncontext->get_element(name);	Value *value=0;
if(!value)	if(can_call_operator)
if(Method* method=OP.get_method(name)) { // maybe 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	// as if that method were in self and we have normal dynamic method here
Junction& junction=*NEW Junction(pool(),	Junction& junction=*NEW Junction(pool(),
*root, self->get_class(), method, 0,0,0,0);	*root, self->get_class(), method, 0,0,0,0);
value=NEW VJunction(junction);	value=NEW VJunction(junction);
}	}
	if(!value)
	value=ncontext->get_element(name);
if(value)	if(value)
value=&process(*value, &name); // process possible code-junction	value=&process_to_value(*value); // process possible code-junction
else {	else
value=NEW VVoid(pool());	value=NEW VVoid(pool());
value->set_name(name);
}

return value;	return value;
}	}
Line 784 Value *Request::get_element() {	Line 848 Value *Request::get_element() {
they want any result[string\|object]	they want any result[string\|object]
nothing goes to wcontext.	nothing goes to wcontext.
used in @c (expression) params evaluation	used in @c (expression) params evaluation

	using the fact it's either string_ or value_ result requested to speed up checkes
*/	*/
Value& Request::process(Value& value, const String *name, bool intercept_string) {	StringOrValue Request::process(Value& input_value, bool intercept_string) {
Value *result;	StringOrValue result;
Junction *junction=value.get_junction();	Junction *junction=input_value.get_junction();
if(junction && junction->code) { // is it a code-junction?	if(junction && junction->code) { // is it a code-junction?
// process it	// process it
#ifdef DEBUG_EXECUTE	#ifdef DEBUG_EXECUTE
Line 798 Value& Request::process(Value& value, co	Line 864 Value& Request::process(Value& value, co
PUSH(rcontext);	PUSH(rcontext);
PUSH(wcontext);	PUSH(wcontext);

WContext *frame;	self=&junction->self;
	root=junction->root;
	rcontext=junction->rcontext;

// for expression method params	// for expression method params
// wcontext is set 0	// wcontext is set 0
// using the fact in decision "which wwrapper to use"	// using the fact in decision "which wwrapper to use"
Line 806 Value& Request::process(Value& value, co	Line 875 Value& Request::process(Value& value, co
if(using_code_frame) {	if(using_code_frame) {
// almost plain wwrapper about junction wcontext,	// almost plain wwrapper about junction wcontext,
// BUT intercepts string writes	// BUT intercepts string writes
frame=NEW VCodeFrame(pool(), *junction->wcontext);	VCodeFrame local(pool(), *junction->wcontext);
} else {	wcontext=&local;
// plain wwrapper
frame=NEW WWrapper(pool(), 0/empty/);
}

//frame->set_name(value.name());
wcontext=frame;
self=&junction->self;
root=junction->root;
rcontext=junction->rcontext;

{ // anti_endless_execute_recoursion	// execute it
if(++anti_endless_execute_recoursion==ANTI_ENDLESS_EXECUTE_RECOURSION) {	recoursion_checked_execute(0/result_name/, *junction->code);
anti_endless_execute_recoursion=0; // give @exception a chance
throw Exception(0, 0,
name,
"junction evaluation canceled - endless recursion detected");
}
execute(*junction->code);
anti_endless_execute_recoursion--;
}

if(using_code_frame) {
// CodeFrame soul:	// CodeFrame soul:
// string writes were intercepted	// string writes were intercepted
// returning them as the result of getting code-junction	// returning them as the result of getting code-junction
result=NEW VString(*frame->get_string());	result.set_string(*wcontext->get_string());
} else	} else {
result=&frame->result();	// 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());	wcontext=static_cast<WContext *>(POP());
rcontext=POP();	rcontext=POP();
Line 845 Value& Request::process(Value& value, co	Line 904 Value& Request::process(Value& value, co
#ifdef DEBUG_EXECUTE	#ifdef DEBUG_EXECUTE
debug_printf(pool(), "<-ja returned");	debug_printf(pool(), "<-ja returned");
#endif	#endif
} else	} else {
result=&value;	result.set_value(input_value);
	}
if(name)	return result;
result->set_name(*name);
return *result;
}	}

const String *Request::execute_method(Value& aself, const Method& method,	const String *Request::execute_method(Value& aself, const Method& method,
Line 862 const String *Request::execute_method(Va	Line 919 const String *Request::execute_method(Va

// initialize contexts	// initialize contexts
root=rcontext=self=&aself;	root=rcontext=self=&aself;
wcontext=NEW WWrapper(pool(), &aself);	WWrapper local(pool(), &aself);
	wcontext=&local;

// execute!	// execute!
execute(*method.parser_code);	execute(*method.parser_code);

// result	// result
const String *result=return_cstr ? &wcontext->as_string() : 0;	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());	wcontext=static_cast<WContext *>(POP());
rcontext=POP();	rcontext=POP();
Line 893 const String& Request::execute_method(VM	Line 957 const String& Request::execute_method(VM
execute(*method.parser_code);	execute(*method.parser_code);

// result	// result
const String& result=wcontext->as_string();	const String& result=wcontext->result().as_string();

wcontext=static_cast<WContext *>(POP());	wcontext=static_cast<WContext *>(POP());
rcontext=POP();	rcontext=POP();

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Removed from v.1.208
changed lines
	Added in v.1.237