--- parser3/src/main/execute.C 2001/02/23 09:43:14 1.23 +++ parser3/src/main/execute.C 2002/10/15 08:31:56 1.282 @@ -1,174 +1,1038 @@ -/* - $Id: execute.C,v 1.23 2001/02/23 09:43:14 paf Exp $ +/** @file + Parser: executor part of request class. + + Copyright (c) 2001, 2002 ArtLebedev Group (http://www.artlebedev.com) + Author: Alexandr Petrosian (http://paf.design.ru) */ +static const char* IDENT_EXECUTE_C="$Date: 2002/10/15 08:31:56 $"; + +#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_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" + +//#define DEBUG_EXECUTE +//#define DEBUG_STRING_APPENDS_VS_EXPANDS + -#include +#ifdef DEBUG_STRING_APPENDS_VS_EXPANDS +ulong wcontext_result_size=0; +#endif + +#ifdef DEBUG_EXECUTE char *opcode_name[]={ - "STRING", "CODE_ARRAY", + // literals + "VALUE", "CURLY_CODE__STORE_PARAM", "EXPR_CODE__STORE_PARAM", + "NESTED_CODE", + + // actions "WITH_ROOT", "WITH_SELF", "WITH_READ", "WITH_WRITE", - "CONSTRUCT", - "EXPRESSION_EVAL", "MODIFY_EVAL", - "WRITE", + "GET_CLASS", + "CONSTRUCT_VALUE", "CONSTRUCT_EXPR", "CURLY_CODE__CONSTRUCT", + "WRITE_VALUE", "WRITE_EXPR_RESULT", "STRING__WRITE", + "GET_ELEMENT_OR_OPERATOR", "OP_GET_ELEMENT_OR_JUNCTION_EXPAND", "GET_ELEMENT", "GET_ELEMENT__WRITE", - "CREATE_EWPOOL", "REDUCE_EWPOOL", - "CREATE_RWPOOL", "REDUCE_RWPOOL", - "GET_METHOD_FRAME", - "CREATE_JUNCTION", + "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", "DEXISTS", + // expression ops: binary + "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", + "IS" }; -void dump(int level, const Array& ops) { - if(0){ - int size=ops.size(); - printf("size=%d\n", size); - for(int i=0; i(ops.quick_get(++i)); - printf(" \"%s\"", vstring->get_string()->cstr()); + if(op.code==OP_VALUE || op.code==OP_STRING__WRITE) { + Value *value=static_cast(i.next()); + debug_printf(pool, + "%*s%s" + " \"%s\" %s", + level*4, "", opcode_name[op.code], + value->get_string()->cstr(), value->type()); + continue; } - printf("\n"); + debug_printf(pool, "%*s%s", level*4, "", opcode_name[op.code]); - if(op.code==OP_CODE_ARRAY) { - const Array *local_ops=reinterpret_cast(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(i.next()); + debug_dump(pool, level+1, *local_ops); } } } +#endif -void Request::execute(Array& ops) { - if(0) { - puts("---------------------------"); - dump(0, ops); - puts("---------------------------"); - } +#define PUSH(value) stack.push(value) +#define POP() static_cast(stack.pop()) +#define POP_NAME() static_cast(stack.pop())->as_string() +#define POP_CODE() static_cast(stack.pop()) - int size=ops.size(); - printf("size=%d\n", size); - for(int i=0; i(ops.quick_get(++i)); - //dump(level+1, *local_ops); - } - + Value *value; + Value *a; Value *b; + Array *b_code; switch(op.code) { - case OP_WITH_WRITE: + // param in next instruction + case OP_VALUE: { - stack.push(wcontext); + value=static_cast(i.next()); +#ifdef DEBUG_EXECUTE + debug_printf(pool(), " \"%s\" %s", value->get_string()->cstr(), value->type()); +#endif + PUSH(value); break; } - case OP_WITH_READ: + case OP_GET_CLASS: { - stack.push(rcontext); + // maybe they do ^class:method[] call, remember the fact + wcontext->set_somebody_entered_some_class(); + + const String& name=POP_NAME(); + value=static_cast(classes().get(name)); + if(!value) + throw Exception("parser.runtime", + &name, + "class is undefined"); + + PUSH(value); break; } - case OP_WITH_ROOT: + + // OP_WITH + case OP_WITH_ROOT: { - stack.push(root); + PUSH(method_frame); break; } case OP_WITH_SELF: { - stack.push(self); + PUSH(self); break; } - - case OP_STRING: + case OP_WITH_READ: { - VString *vstring=static_cast(ops.quick_get(++i)); - printf(" \"%s\"", vstring->get_string()->cstr()); - stack.push(vstring); + PUSH(rcontext); break; } - - case OP_CONSTRUCT: + case OP_WITH_WRITE: { - Value *value=static_cast(stack.pop()); - VString *name=static_cast(stack.pop()); - Value *ncontext=static_cast(stack.pop()); - ncontext->put_element(*name, value); + PUSH(wcontext); break; } - case OP_WRITE: + // OTHER ACTIONS BUT WITHs + case OP_CONSTRUCT_VALUE: { - Value *value=static_cast(stack.pop()); - wcontext->write(value); + value=POP(); + const String& name=POP_NAME(); + Value *ncontext=POP(); + ncontext->put_element(name, value, false); + break; + } + case OP_CONSTRUCT_EXPR: + { + // 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(), false); + break; + } + case OP_CURLY_CODE__CONSTRUCT: + { + const Array *local_ops=reinterpret_cast(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, + method_frame, + rcontext, + wcontext, + local_ops); + + value=NEW VJunction(j); + const String& name=POP_NAME(); + Value *ncontext=POP(); + ncontext->put_element(name, value, false); + break; + } + case OP_NESTED_CODE: + { + Array *local_ops=static_cast(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_WRITE_VALUE: + { + value=POP(); + write_assign_lang(*value, last_get_element_name); + break; + } + case OP_WRITE_EXPR_RESULT: + { + 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(i.next()); +#ifdef DEBUG_EXECUTE + debug_printf(pool(), " \"%s\"", vstring->string().cstr()); +#endif + write_no_lang(vstring->string()); break; } + case OP_GET_ELEMENT_OR_OPERATOR: + { + value=get_element(last_get_element_name, true); + PUSH(value); + break; + } + case OP_GET_ELEMENT_OR_JUNCTION_EXPAND: + { + value=get_element(last_get_element_name, false, true/* the only user */); + PUSH(value); + break; + } case OP_GET_ELEMENT: { - Value *value=get_element(); - stack.push(value); + value=get_element(last_get_element_name, false); + PUSH(value); break; } case OP_GET_ELEMENT__WRITE: { - Value *value=get_element(); - wcontext->write(value); + 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_CREATE_EWPOOL: + + case OP_OBJECT_POOL: { - stack.push(wcontext); - wcontext=NEW WContext(pool(), 0 /* empty */); + const Array *local_ops=reinterpret_cast(i.next()); + + WContext *saved_wcontext=wcontext; + uchar saved_lang= flang; + flang=String::UL_PASS_APPENDED; + WWrapper local(pool(), 0 /*empty*/, wcontext); + wcontext=&local; + + execute(*local_ops); + + value=&wcontext->result().as_value(); + flang=saved_lang; + wcontext=saved_wcontext; + PUSH(value); break; } - case OP_REDUCE_EWPOOL: + + case OP_STRING_POOL: { - Value *value=wcontext->value(); - wcontext=static_cast(stack.pop()); - stack.push(value); + const Array *local_ops=reinterpret_cast(i.next()); + + WContext *saved_wcontext=wcontext; + WWrapper local(pool(), 0 /*empty*/, wcontext); + wcontext=&local; + + execute(*local_ops); + + // 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); + else + NEW VVoid(pool()); + wcontext=saved_wcontext; + PUSH(value); break; } - + + // CALL + case OP_STORE_PARAM: + { + value=POP(); + VMethodFrame *frame=static_cast(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_CURLY_CODE__STORE_PARAM: + case OP_EXPR_CODE__STORE_PARAM: + { + // code + const Array *local_ops=reinterpret_cast(i.next()); + VMethodFrame *frame=static_cast(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, + method_frame, + 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: + { + Array *local_ops=static_cast(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(); + + 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()); + /* 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", + last_get_element_name, + "(%s) is code junction, can not call it", + value->type()); + */ + + VMethodFrame frame(pool(), *last_get_element_name, *junction, method_frame/*caller*/); + if(local_ops){ // store param code goes here + PUSH(&frame); // argument for *STORE_PARAM ops + execute(*local_ops); + POP(); + } + frame.fill_unspecified_params(); + Value *saved_self=self; + VMethodFrame *saved_method_frame=method_frame; + Value *saved_rcontext=rcontext; + WContext *saved_wcontext=wcontext; + + 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 + self=&frame.junction.self; + + frame.set_self(*self); + + // see OP_PREPARE_TO_EXPRESSION + frame.set_in_expression(wcontext->get_in_expression()); + + rcontext=wcontext=&frame; + { + 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? + // method_frame 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 + method_frame=&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"); + + } + StringOrValue result=wcontext->result(); + + wcontext=saved_wcontext; + rcontext=saved_rcontext; + method_frame=saved_method_frame; + self=saved_self; + +#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); + } else { // OP_CALL + PUSH(&result.as_value()); + } + +#ifdef DEBUG_EXECUTE + debug_printf(pool(), "<-returned"); +#endif + break; + } + + // expression ops: unary + case OP_NEG: + { + Value *operand=POP(); + value=NEW VDouble(pool(), -operand->as_double()); + PUSH(value); + break; + } + case OP_INV: + { + Value *operand=POP(); + value=NEW VDouble(pool(), ~operand->as_int()); + PUSH(value); + break; + } + case OP_NOT: + { + Value *operand=POP(); + value=NEW VBool(pool(), !operand->as_bool()); + PUSH(value); + break; + } + case OP_DEF: + { + Value *operand=POP(); + value=NEW VBool(pool(), operand->is_defined()); + PUSH(value); + break; + } + case OP_IN: + { + /// @test String::cmp + Value *operand=POP(); + 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_FEXISTS: + { + Value *operand=POP(); + value=NEW VBool(pool(), + file_readable(absolute(operand->as_string()))); + PUSH(value); + break; + } + case OP_DEXISTS: + { + Value *operand=POP(); + 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_SL: + { + b=POP(); a=POP(); + value=NEW VInt(pool(), + a->as_int() << + b->as_int()); + PUSH(value); + break; + } + case OP_BIN_SR: + { + b=POP(); a=POP(); + value=NEW VInt(pool(), + a->as_int() >> + b->as_int()); + PUSH(value); + break; + } + case OP_BIN_AND: + { + b=POP(); a=POP(); + value=NEW VInt(pool(), + a->as_int() & + b->as_int()); + PUSH(value); + break; + } + case OP_BIN_OR: + { + b=POP(); a=POP(); + value=NEW VInt(pool(), + a->as_int() | + b->as_int()); + PUSH(value); + break; + } + case OP_BIN_XOR: + { + b=POP(); a=POP(); + value=NEW VInt(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(); + double result=a->as_double() - b->as_double(); + value=NEW VBool(pool(), result < 0.0); + PUSH(value); + break; + } + case OP_NUM_GT: + { + b=POP(); a=POP(); + double result=a->as_double() - b->as_double(); + value=NEW VBool(pool(), result > 0.0); + PUSH(value); + break; + } + case OP_NUM_LE: + { + b=POP(); a=POP(); + double result=a->as_double() - b->as_double(); + value=NEW VBool(pool(), result <= 0.0); + PUSH(value); + break; + } + case OP_NUM_GE: + { + b=POP(); a=POP(); + double result=a->as_double() - b->as_double(); + value=NEW VBool(pool(), result >= 0.0); + PUSH(value); + break; + } + case OP_NUM_EQ: + { + b=POP(); a=POP(); + double result=a->as_double() - b->as_double(); + value=NEW VBool(pool(), result == 0.0); + PUSH(value); + break; + } + case OP_NUM_NE: + { + b=POP(); a=POP(); + double result=a->as_double() - b->as_double(); + value=NEW VBool(pool(), result != 0.0); + 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: + { + b=POP(); a=POP(); + value=NEW VBool(pool(), a->is(b->as_string().cstr())); + PUSH(value); + break; + } + default: - printf("\tTODO"); - break; + throw Exception(0, + 0, + "invalid opcode %d", op.code); } - printf("\n"); } } -Value *Request::get_element() { - VString *name=static_cast(stack.pop()); - Value *ncontext=static_cast(stack.pop()); - Value *value=ncontext->get_element(*name); // name áûâàåò method, òîãäà âûäà¸ò new junction(ÀÂÒÎÂÛ×ÈÑËßÒÜ=false, root,self,rcontext,wcontext,code) - // name áûâàåò èìÿ junction, òîãäà èëè îñòàâëÿåò â ïîêîå, èëè âû÷èñëÿåò â çàâèñèìîñòè îò ôëàãà ÀÂÒÎÂÛ×ÈÑËßÒÜ - +/// @test cache|prepare junctions +Value *Request::get_element(const String *& remember_name, + bool can_call_operator, bool should_explode_junction) { + const String& name=POP_NAME(); remember_name=&name; + Value *ncontext=POP(); + Value *value=0; + if(can_call_operator) { + if(Method* method=main_class.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(), + main_class, method, 0,0,0,0); + value=NEW VJunction(junction); + } + } if(!value) { -// value=NEW VHash(pool()); -// ncontext->put_element(*name, value); - value=NEW VUnknown(pool()); + 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_object=self->base_object()) { // doing DYNAMIC call + Temp_derived temp_derived(*base_object, 0); // temporarily prevent go-back-down virtual calls + value=base_object->get_element(name, base_object, false); // virtual-up lookup starting from parent + goto _void; + } } + if(!value) + value=ncontext->get_element(name, ncontext, false); + +_void: + if(value) { + if(should_explode_junction) // process $junction, but leave $junction.xxx as is + value=&process_to_value(*value); // process possible code-junction + } else + value=NEW VVoid(pool()); + return value; -} \ No newline at end of file +} + +/** @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 + + if(!junction->method_frame) + throw Exception("parser.runtime", + 0, + "junction used outside of context"); + + Value *saved_self=self; + VMethodFrame *saved_method_frame=method_frame; + Value *saved_rcontext=rcontext; + WContext *saved_wcontext=wcontext; + + self=&junction->self; + 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 + VCodeFrame local(pool(), *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.set_string(*wcontext->get_string()); + } else { + // plain wwrapper + WWrapper local(pool(), 0/*empty*/, wcontext); + wcontext=&local; + + // execute it + recoursion_checked_execute(0/*result_name*/, *junction->code); + + result=wcontext->result(); + } + + wcontext=saved_wcontext; + rcontext=saved_rcontext; + method_frame=saved_method_frame; + self=saved_self; + +#ifdef DEBUG_EXECUTE + debug_printf(pool(), "<-ja returned"); +#endif + } else { + result.set_value(input_value); + } + return result; +} + +const String& Request::execute_method(VMethodFrame& amethod_frame, const Method& method) { + Value *saved_self=self; + VMethodFrame *saved_method_frame=method_frame; + Value *saved_rcontext=rcontext; + WContext *saved_wcontext=wcontext; + + // initialize contexts + self=rcontext=wcontext=method_frame=&amethod_frame; + + // execute! + execute(*method.parser_code); + + // result + const String& result=wcontext->result().as_string(); + + wcontext=saved_wcontext; + rcontext=saved_rcontext; + method_frame=saved_method_frame; + self=saved_self; + + // return + return result; +} + +void Request::execute_method(Value& aself, + const Method& method, VString *optional_param, + const String **return_string) { + Value *saved_self=self; + VMethodFrame *saved_method_frame=method_frame; + Value *saved_rcontext=rcontext; + WContext *saved_wcontext=wcontext; + + // initialize contexts + //method_frame=rcontext=self=&aself; + self=&aself; +// WWrapper local(pool(), &aself, wcontext); +// wcontext=&local; + Junction local_junction(pool(), *self, &method, 0,0,0,0); + VMethodFrame local_frame(pool(), method.name, 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(*self); + rcontext=wcontext=method_frame=&local_frame; + + // prevent non-string writes for better error reporting + if(return_string) + wcontext->write(local_frame); + + // execute! + execute(*method.parser_code); + + // result + const String *result=0; + if(return_string) + *return_string=&wcontext->result().as_string(); + + wcontext=saved_wcontext; + rcontext=saved_rcontext; + method_frame=saved_method_frame; + self=saved_self; +} + +void Request::execute_nonvirtual_method(VStateless_class& aclass, + const String& method_name, VString *optional_param, + const String **return_string, + const Method **return_method) { + + const Method *method=aclass.get_method(method_name); + if(return_string) + *return_string=0; + if(return_method) + *return_method=method; + + if(method) + execute_method(aclass, *method, optional_param, return_string); +} + +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) { + const String *result; + execute_method(aself, *method, 0/*no params*/, &result); + return result; + } + + return 0; +}