Logo Search packages:      
Sourcecode: parser version File versions  Download package

execute.C

Go to the documentation of this file.
/** @file
      Parser: executor part of request class.

      Copyright (c) 2001-2005 ArtLebedev Group (http://www.artlebedev.com)
      Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
*/

static const char * const IDENT_EXECUTE_C="$Date: 2008-08-19 14:24:29 $";

#include "pa_opcode.h"
#include "pa_array.h" 
#include "pa_request.h"
#include "pa_vstring.h"
#include "pa_vhash.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

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

      // actions
      "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",
      "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 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);
}

void debug_dump(SAPI_Info& sapi_info, int level, ArrayOperation& ops) {
      Array_iterator<Operation> i(ops);
      while(i.has_next()) {
            OP::OPCODE opcode=i.next().code;

            if(opcode==OP::OP_VALUE || opcode==OP::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;
            }
            debug_printf(sapi_info, "%*s%s", level*4, "", opcode_name[opcode]);

            switch(opcode) {
            case OP::OP_CURLY_CODE__STORE_PARAM: 
            case OP::OP_EXPR_CODE__STORE_PARAM:
            case OP::OP_CURLY_CODE__CONSTRUCT:
            case OP::OP_NESTED_CODE:
            case OP::OP_OBJECT_POOL:  
            case OP::OP_STRING_POOL:
            case OP::OP_CALL:
            case OP::OP_CALL__WRITE:
                  if(ArrayOperation* local_ops=i.next().ops)
                        debug_dump(sapi_info, level+1, *local_ops);
            }
      }
}
#endif

// Request

00105 void Request::execute(ArrayOperation& ops) {
      register Stack<StackItem>& stack=this->stack; // helps a lot on MSVC: 'esi'

      const String* debug_name=0;  Operation::Origin debug_origin={0, 0, 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_skip())
                  return;
            if(get_interrupted()) {
                  set_interrupted(false);
                  throw Exception("parser.interrupted",
                        0,
                        "execution stopped");
            }
            OP::OPCODE opcode=i.next().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::OP_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::OP_GET_CLASS:
                  {
                        // 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,
                                    "class is undefined"); 

                        stack.push(*value);
                        break;
                  }
                  
            // OP_WITH
            case OP::OP_WITH_ROOT:
                  {
                        stack.push(*method_frame);
                        break;
                  }
            case OP::OP_WITH_SELF: 
                  {
                        stack.push(get_self());
                        break;
                  }
            case OP::OP_WITH_READ: 
                  {
                        stack.push(*rcontext);
                        break;
                  }
            case OP::OP_WITH_WRITE: 
                  {
                        if(wcontext==method_frame)
                              throw Exception(PARSER_RUNTIME,
                                    0,
                                    "$.name outside of $name[...]");

                        stack.push(*wcontext);
                        break;
                  }
                  
            // OTHER ACTIONS BUT WITHs
            case OP::OP_CONSTRUCT_VALUE:
                  {
                        Value& value=stack.pop().value();
                        const String& name=stack.pop().string();  debug_name=&name;
                        Value& ncontext=stack.pop().value();
                        put_element(ncontext, name, value);

                        break;
                  }
            case OP::OP_CONSTRUCT_EXPR:
                  {
                        // see OP_PREPARE_TO_EXPRESSION
                        wcontext->set_in_expression(false);

                        Value& expr=stack.pop().value();
                        const String& name=stack.pop().string();  debug_name=&name;
                        Value& ncontext=stack.pop().value();
                        Value& value=expr.as_expr_result();
                        put_element(ncontext, name, value);
                        break;
                  }
            case OP::OP_CURLY_CODE__CONSTRUCT:
                  {
                        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(
                              get_self(), 0,
                              method_frame, 
                              rcontext, 
                              wcontext, 
                              &local_ops);

                        const String& name=stack.pop().string();  debug_name=&name;
                        Value& ncontext=stack.pop().value();
                        if(const VJunction* vjunction=ncontext.put_element(ncontext, name, &value, false))
                              if(vjunction!=PUT_ELEMENT_REPLACED_ELEMENT)
                                    throw Exception(PARSER_RUNTIME,
                                          0,
                                          "property value can not be code, use [] or () brackets");
                              
                        break;
                  }
            case OP::OP_NESTED_CODE:
                  {
                        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::OP_WRITE_VALUE:
                  {
                        Value& value=stack.pop().value();
                        write_assign_lang(value);
                        break;
                  }
            case OP::OP_WRITE_EXPR_RESULT:
                  {
                        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::OP_STRING__WRITE:
                  {
                        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::OP_GET_ELEMENT_OR_OPERATOR:
                  {
                        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::OP_GET_ELEMENT:
                  {
                        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::OP_GET_ELEMENT__WRITE:
                  {
                        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::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::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
                        if(const String* string=wcontext->get_string())
                              value=new VString(*string);
                        else
                              value=new VVoid;
                        stack.push(*value);

                        wcontext=saved_wcontext;
                        break;
                  }

            // CALL
            case OP::OP_STORE_PARAM:
                  {
                        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::OP_CURLY_CODE__STORE_PARAM:
            case OP::OP_EXPR_CODE__STORE_PARAM:
                  {
                        // 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(
                              get_self(), 0,
                              method_frame, 
                              rcontext, 
                              opcode==OP::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::OP_PREPARE_TO_CONSTRUCT_OBJECT:
                  {
                        wcontext->set_constructing(true);
                        break;
                  }

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

            case OP::OP_CALL:
            case OP::OP_CALL__WRITE:
                  {
                        //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);
                        if(local_ops){ // store param code goes here
                              stack.push(frame); // argument for *STORE_PARAM ops
                              execute(*local_ops);
                              stack.pop().value();
                        }
                        WContext* result_wcontext=op_call(frame);
                        if(opcode==OP::OP_CALL__WRITE) {
                              write_assign_lang(result_wcontext->result());
                        } else { // OP_CALL
                              stack.push(result_wcontext->result().as_value());
                        }

#ifdef DEBUG_EXECUTE
                        debug_printf(sapi_info, "<-returned");
#endif
                        //is_debug_junction=false;
                        break;
                  }

            // expression ops: unary
            case OP::OP_NEG:
                  {
                        Value& a=stack.pop().value();
                        Value& value=*new VDouble(-a.as_double());
                        stack.push(value);
                        break;
                  }
            case OP::OP_INV:
                  {
                        Value& a=stack.pop().value();
                        Value& value=*new VDouble(~a.as_int());
                        stack.push(value);
                        break;
                  }
            case OP::OP_NOT:
                  {
                        Value& a=stack.pop().value();
                        Value& value=*new VBool(!a.as_bool());
                        stack.push(value);
                        break;
                  }
            case OP::OP_DEF:
                  {
                        Value& a=stack.pop().value();
                        Value& value=*new VBool(a.is_defined());
                        stack.push(value);
                        break;
                  }
            case OP::OP_IN:
                  {
                        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::OP_FEXISTS:
                  {
                        Value& a=stack.pop().value();
                        Value& value=*new VBool(file_exist(absolute(a.as_string())));
                        stack.push(value);
                        break;
                  }
            case OP::OP_DEXISTS:
                  {
                        Value& a=stack.pop().value();
                        Value& value=*new VBool(dir_exists(absolute(a.as_string())));
                        stack.push(value);
                        break;
                  }

            // expression ops: binary
            case OP::OP_SUB: 
                  {
                        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::OP_ADD: 
                  {
                        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::OP_MUL: 
                  {
                        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::OP_DIV: 
                  {
                        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::OP_MOD: 
                  {
                        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::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::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::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::OP_BIN_AND:
                  {
                        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::OP_BIN_OR:
                  {
                        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::OP_BIN_XOR:
                  {
                        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::OP_LOG_AND:
                  {
                        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::OP_LOG_OR:
                  {
                        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::OP_LOG_XOR:
                  {
                        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::OP_NUM_LT: 
                  {
                        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::OP_NUM_GT: 
                  {
                        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::OP_NUM_LE: 
                  {
                        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::OP_NUM_GE: 
                  {
                        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::OP_NUM_EQ: 
                  {
                        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::OP_NUM_NE: 
                  {
                        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::OP_STR_LT: 
                  {
                        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::OP_STR_GT: 
                  {
                        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::OP_STR_LE: 
                  {
                        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::OP_STR_GE: 
                  {
                        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::OP_STR_EQ: 
                  {
                        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::OP_STR_NE: 
                  {
                        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::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 Exception(0,
                        0,
                        "invalid opcode %d", opcode); 
            }
      }
      } catch(const Exception&) {
            // record it to stack trace
            if(debug_name)
                  exception_trace.push(Trace(debug_name, debug_origin));
            rethrow;
      }
}

WContext* Request::op_call(VMethodFrame& frame){
      frame.fill_unspecified_params();
      VMethodFrame *saved_method_frame=method_frame;
      Value* saved_rcontext=rcontext;
      WContext *saved_wcontext=wcontext;
                  
      VStateless_class& called_class=*frame.junction.self.get_class();
      Value* new_self;
      if(wcontext->get_constructing()) {
            wcontext->set_constructing(false);
            new_self=&get_self();
            if(frame.junction.method->call_type!=Method::CT_STATIC) {
                  // this is a constructor call
                  HashStringValue& new_object_fields=*new HashStringValue();
                  if(Value* value=called_class.create_new_value(fpool, new_object_fields)) {
                        // 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(*new_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==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(*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 *result_wcontext=wcontext;
      // StringOrValue result=wcontext->result();

      wcontext=saved_wcontext;
      rcontext=saved_rcontext;
      method_frame=saved_method_frame;

      return result_wcontext;
}


/**
      @todo cache|prepare junctions
      @bug ^superbase:method would dynamically call ^base:method if there is any
*/
00842 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(main_class, method);
      }
      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, true); // virtual-up lookup starting from parent
                                          goto value_ready;
                                    }
      }
      if(!value)
            value=ncontext.get_element(name, ncontext, true);

      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=&process_to_value(*value); // process possible code-junction
      else
            value=new VVoid;

      return *value;
}

void Request::put_element(Value& ncontext, const String& name, Value& value) {
      // put_element can return property-setting-junction
      if(const VJunction* vjunction=ncontext.put_element(ncontext, name, &value, false))
            if(vjunction!=PUT_ELEMENT_REPLACED_ELEMENT) {
                  const Junction& junction=vjunction->junction();
                  // process it
                  ArrayString* params_names=junction.method->params_names;
                  int param_count=params_names? params_names->count(): 0;
                  if(param_count!=1)
                        throw Exception(PARSER_RUNTIME,
                              0,
                              "setter method must have ONE parameter (has %d parameters)", param_count);

                  VMethodFrame frame(junction, method_frame/*caller*/);
                  frame.store_param(value);

                  frame.set_self(frame.junction.self);

                  VMethodFrame *saved_method_frame=method_frame;
                  Value* saved_rcontext=rcontext;
                  WContext *saved_wcontext=wcontext;

                  rcontext=wcontext=&frame;
                  method_frame=&frame;

                  // prevent non-string writes for better error reporting [setters are not expected to return anything]
                  wcontext->write(*method_frame);

                  recoursion_checked_execute(*frame.junction.method->parser_code); // parser code, execute it
                  // we don't need it StringOrValue result=wcontext->result();

                  method_frame=saved_method_frame;
                  wcontext=saved_wcontext;
                  rcontext=saved_rcontext;
            }
}

/**   @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
*/
00929 StringOrValue Request::process(Value& input_value, bool intercept_string) {
      Junction* junction=input_value.get_junction();
      if(junction) {
            if(junction->is_getter) { // is it a getter-junction?
                  int param_count=junction->method->params_names?junction->method->params_names->count():0;
                  if(junction->auto_name){ // default getter
                        if(param_count>1)
                              throw Exception(PARSER_RUNTIME,
                                    0,
                                    "default getter method can't have more then 1 parameter (has %d parameters)", param_count);
                  } else if(param_count)
                        throw Exception(PARSER_RUNTIME,
                              0,
                              "getter method must have no parameters (has %d parameters)", param_count);

                  VMethodFrame frame(*junction, method_frame/*caller*/);

                  if(junction->auto_name && param_count)
                        frame.store_param(*new VString(*junction->auto_name));

                  frame.set_self(frame.junction.self);

                  VMethodFrame *saved_method_frame=method_frame;
                  Value* saved_rcontext=rcontext;
                  WContext *saved_wcontext=wcontext;

                  rcontext=wcontext=&frame;
                  method_frame=&frame;

                  recoursion_checked_execute(*frame.junction.method->parser_code); // parser code, execute it
                  StringOrValue result=wcontext->result();

                  method_frame=saved_method_frame;
                  wcontext=saved_wcontext;
                  rcontext=saved_rcontext;

                  return result;
            }

            if(junction->code) { // is it a code-junction?
                  // process it
                  StringOrValue result;
#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;

                  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 

                        VCodeFrame local(*junction->wcontext);
                        wcontext=&local;

                        // execute it
                        recoursion_checked_execute(*junction->code);

                        // CodeFrame soul:
                        result=wcontext->result();
                  } else {
                        // plain wwrapper
                        WWrapper local(0/*empty*/, wcontext);
                        wcontext=&local;

                        // execute it
                        recoursion_checked_execute(*junction->code);

                        result=wcontext->result();
                  }

                  wcontext=saved_wcontext;
                  rcontext=saved_rcontext;
                  method_frame=saved_method_frame;

#ifdef DEBUG_EXECUTE
                  debug_printf(sapi_info, "<-ja returned");
#endif
                  return result;
            }

            // it is then method-junction, do not explode it
            // just return it as we do for usual objects
      }     

      return input_value;
}

01030 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);
      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;
}

01100 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;
}

Generated by  Doxygen 1.6.0   Back to index