--- parser3/src/main/compile_tools.C	2012/03/16 09:24:12	1.69
+++ parser3/src/main/compile_tools.C	2026/04/23 18:50:11	1.84
@@ -1,8 +1,8 @@
 /** @file
 	Parser: compiler support helper functions.
 
-	Copyright (c) 2001-2012 Art. Lebedev Studio (http://www.artlebedev.com)
-	Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
+	Copyright (c) 2001-2024 Art. Lebedev Studio (http://www.artlebedev.com)
+	Authors: Konstantin Morshnev <moko@design.ru>, Alexandr Petrosian <paf@design.ru>
 */
 
 #include "compile_tools.h"
@@ -13,7 +13,7 @@
 #include "pa_vdouble.h"
 #include "pa_vmethod_frame.h"
 
-volatile const char * IDENT_COMPILE_TOOLS_C="$Id: compile_tools.C,v 1.69 2012/03/16 09:24:12 moko Exp $" IDENT_COMPILE_TOOLS_H;
+volatile const char * IDENT_COMPILE_TOOLS_C="$Id: compile_tools.C,v 1.84 2026/04/23 18:50:11 moko Exp $" IDENT_COMPILE_TOOLS_H;
 
 Value* LA2V(ArrayOperation& literal_string_array, int offset, OP::OPCODE code) {
 	return literal_string_array[offset+0].code==code?literal_string_array[offset+2/*skip opcode&origin*/].value
@@ -32,70 +32,73 @@ void change_string_literal_value(ArrayOp
 	static_cast<VString*>(literal_string_array[2/*opcode+origin*/].value)->set_string(new_value);
 }
 
-void changetail_or_append(ArrayOperation& opcodes, 
-						  OP::OPCODE find, bool with_argument, OP::OPCODE replace, OP::OPCODE notfound) {
-	int tail=opcodes.count()-(with_argument?2:1);
-	if(tail>=0) {
-		Operation& op=opcodes.get_ref(tail);
-		if(op.code==find) {
-			op.code=replace;
-			return;
-		}
-	}
-
-	opcodes+=Operation(notfound);
-}
-
-bool maybe_change_first_opcode(ArrayOperation& opcodes, OP::OPCODE find, OP::OPCODE replace) {
-	if(opcodes[0].code!=find)
+bool change_first(ArrayOperation& opcodes, OP::OPCODE find, OP::OPCODE replace) {
+	Operation& op=opcodes.get_ref(0);
+	if(op.code!=find)
 		return false;
 
-	opcodes.put(0, replace);
+	op.code=replace;
 	return true;
 }
 
 
 // OP_VALUE+origin+self+OP_GET_ELEMENT+OP_VALUE+origin+value+OP_GET_ELEMENT => OP_WITH_SELF__VALUE__GET_ELEMENT+origin+value
-bool maybe_make_self(ArrayOperation& opcodes, ArrayOperation& diving_code, size_t divine_count){
+bool maybe_make_self(ArrayOperation& opcodes, ArrayOperation& diving_code, size_t diving_count){
 	const String* first_name=LA2S(diving_code);
 
-	if(first_name && *first_name==SELF_ELEMENT_NAME){
+	if(first_name && SYMBOLS_EQ(*first_name,SELF_SYMBOL)){
 #ifdef OPTIMIZE_BYTECODE_GET_SELF_ELEMENT
 		if(
-			divine_count>=8
+			diving_count>=8
 			&& diving_code[3].code==OP::OP_GET_ELEMENT
 			&& diving_code[4].code==OP::OP_VALUE
 			&& diving_code[7].code==OP::OP_GET_ELEMENT
 		){
 			// optimization for $self.field and ^self.method
 			O(opcodes, OP::OP_WITH_SELF__VALUE__GET_ELEMENT);
-			P(opcodes, diving_code, 5/*offset*/, 2/*limit*/); // copy second origin+value. we know that the first one is "self"
-			if(divine_count>8)
-				P(opcodes, diving_code, 8/*offset*/); // copy tail
+			P(opcodes, diving_code, 5 /*offset*/, 2 /*limit*/); // copy second origin+value. we know that the first one is "self"
+			if(diving_count>8)
+				P(opcodes, diving_code, 8 /*offset*/); // copy tail
 		} else
 #endif
 		{
 			// self.xxx... => xxx...
 			// OP_VALUE+origin+string+OP_GET_ELEMENT+... -> OP_WITH_SELF+...
 			O(opcodes, OP::OP_WITH_SELF); /* stack: starting context */
-			P(opcodes, diving_code, divine_count>=4?4/*OP::OP_VALUE+origin+string+OP::OP_GET_ELEMENTx*/:3/*OP::OP_+origin+string*/);
+			P(opcodes, diving_code, diving_count >=4 ? 4 /*OP::OP_VALUE+origin+string+OP::OP_GET_ELEMENTx*/ : 3 /*OP::OP_+origin+string*/);
 		}
 		return true;
 	}
 	return false;
 }
 
+bool maybe_append_simple_diving_code(ArrayOperation& code, ArrayOperation& diving_code){
+	if(
+		diving_code.count()==3
+		&& diving_code[0].code==OP::OP_STRING__WRITE
+	){
+		O(code, OP::OP_VALUE);
+		P(code, diving_code, 1/*offset*/, 2/*limit*/); /*copy origin+value*/
+		return true;
+	} else {
+		return false;
+	}
+}
+
+#ifdef OPTIMIZE_BYTECODE_GET_ELEMENT__SPECIAL
+bool is_special_element(ArrayOperation& opcodes){
+	const String* name=LA2S(opcodes);
+	return name && ( SYMBOLS_EQ(*name,CLASS_SYMBOL) || SYMBOLS_EQ(*name,CLASS_NAME_SYMBOL) );
+}
+#endif
 
 Method::Call_type GetMethodCallType(Parse_control& pc, ArrayOperation& literal_array) {
 	const String* full_name=LA2S(literal_array);
 	int pos=full_name->pos(':');
 	if(pos > 0) {
 		const String call_type=full_name->mid(0, pos);
-		if(call_type!=method_call_type_static)
-			throw Exception("parser.compile",
-					&call_type,
-					"incorrect method call type. the only valid call type method prefix is '"METHOD_CALL_TYPE_STATIC"'"
-				);
+		if(call_type!=Symbols::STATIC_SYMBOL)
+			throw Exception("parser.compile", &call_type, "incorrect method call type. the only valid call type method prefix is 'static'");
 		const String *sole_name=&full_name->mid(pos+1, full_name->length());
 		// replace full method name (static:method) by sole method name (method). it will be used later.
 		change_string_literal_value(literal_array, *sole_name);
@@ -109,15 +112,13 @@ void push_LS(Parse_control& pc, lexical_
 		pc.ls_stack[pc.ls_sp++]=pc.ls;  
 		pc.ls=new_state;
 	} else
-		throw Exception(0, 0, 
-			"push_LS: ls_stack overflow");
+		throw Exception(0, 0, "push_LS: ls_stack overflow");
 }
 void pop_LS(Parse_control& pc) {
 	if(--pc.ls_sp>=0)
 		pc.ls=pc.ls_stack[pc.ls_sp];
 	else
-		throw Exception(0, 0, 
-			"pop_LS: ls_stack underflow");
+		throw Exception(0, 0, "pop_LS: ls_stack underflow");
 }
 
 const String& Parse_control::alias_method(const String& name) {