/** @file Parser: executor part of request class. Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com) Author: Alexander Petrosyan (http://design.ru/paf) $Id: execute.C,v 1.164 2001/05/21 17:12:58 parser Exp $ */ #include "pa_opcode.h" #include "pa_array.h" #include "pa_request.h" #include "pa_vstring.h" #include "pa_vhash.h" #include "pa_vnothing.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" //#define DEBUG_EXECUTE const uint ANTI_ENDLESS_EXECUTE_RECOURSION=500; #ifdef DEBUG_EXECUTE char *opcode_name[]={ // literals "VALUE", "CURLY_CODE__STORE_PARAM", "EXPR_CODE__STORE_PARAM", // actions "WITH_SELF", "WITH_ROOT", "WITH_READ", "WITH_WRITE", "GET_CLASS", "CONSTRUCT_VALUE", "CONSTRUCT_DOUBLE", "WRITE_VALUE", "WRITE_EXPR_RESULT", "STRING__WRITE", "GET_ELEMENT", "GET_ELEMENT__WRITE", "CREATE_EWPOOL", "REDUCE_EWPOOL", "CREATE_RWPOOL", "REDUCE_RWPOOL", "CREATE_SWPOOL", "REDUCE_SWPOOL", "GET_METHOD_FRAME", "STORE_PARAM", "CALL", // expression ops: unary "NEG", "INV", "NOT", "DEF", "IN", "FEXISTS", "DEXISTS", // expression ops: binary "SUB", "ADD", "MUL", "DIV", "MOD", "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(Pool& pool, const char *fmt,va_list args) { char buf[MAX_STRING]; vsnprintf(buf, MAX_STRING, fmt, args); SAPI::log(pool, "%s", buf); } void debug_printf(Pool& pool, const char *fmt, ...) { va_list args; va_start(args,fmt); va_debug_printf(pool,fmt,args); va_end(args); } void debug_dump(Pool& pool, int level, const Array& ops) { { int size=ops.quick_size(); //debug_printf(pool, "size=%d\n", size); for(int i=0; i(ops.quick_get(++i)); debug_printf(pool, "%*s%s" " \"%s\" %s", level*4, "", opcode_name[op.code], value->get_string()->cstr(), value->type()); continue; } debug_printf(pool, "%*s%s", level*4, "", opcode_name[op.code]); if(op.code==OP_CURLY_CODE__STORE_PARAM || op.code==OP_EXPR_CODE__STORE_PARAM) { const Array *local_ops=reinterpret_cast(ops.quick_get(++i)); debug_dump(pool, level+1, *local_ops); } } } #endif #define PUSH(value) stack.push(value) #define POP() static_cast(stack.pop()) #define POP_NAME() static_cast(stack.pop())->as_string() void Request::execute(const Array& ops) { #ifdef DEBUG_EXECUTE debug_printf(pool(), "source----------------------------\n"); debug_dump(pool(), 0, ops); debug_printf(pool(), "execution-------------------------\n"); #endif int size=ops.quick_size(); //debug_printf(pool(), "size=%d\n", size); for(int i=0; i(ops.quick_get(++i)); #ifdef DEBUG_EXECUTE debug_printf(pool(), " \"%s\" %s", value->get_string()->cstr(), value->type()); #endif PUSH(value); break; } case OP_CURLY_CODE__STORE_PARAM: case OP_EXPR_CODE__STORE_PARAM: { VMethodFrame *frame=static_cast(stack.top_value()); // code const Array *local_ops=reinterpret_cast(ops.quick_get(++i)); #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 *value=NEW VJunction(j); // store param frame->store_param(frame->name(), value); break; } case OP_GET_CLASS: { // maybe they do ^class:method[] call, remember the fact wcontext->set_somebody_entered_some_class(); const String& name=POP_NAME(); Value *value=static_cast(classes().get(name)); if(!value) THROW(0,0, &name, "class is undefined"); PUSH(value); break; } // OP_WITH case OP_WITH_SELF: { PUSH(self); break; } case OP_WITH_ROOT: { PUSH(root); break; } case OP_WITH_READ: { PUSH(rcontext); break; } case OP_WITH_WRITE: { PUSH(wcontext); break; } // OTHER ACTIONS BUT WITHs case OP_CONSTRUCT_VALUE: { Value *value=POP(); const String& name=POP_NAME(); Value *ncontext=POP(); ncontext->put_element(name, value); value->set_name(name); break; } case OP_CONSTRUCT_EXPR: { Value *value=POP(); const String& name=POP_NAME(); Value *ncontext=POP(); ncontext->put_element(name, value->as_expr_result()); value->set_name(name); break; } case OP_WRITE_VALUE: { Value *value=POP(); write_assign_lang(*value); // forget the fact they've entered some ^object.method[]. // see OP_GET_ELEMENT wcontext->clear_somebody_entered_some_object(); break; } case OP_WRITE_EXPR_RESULT: { Value *value=POP(); write_expr_result(*value->as_expr_result()); break; } case OP_STRING__WRITE: { VString *vstring=static_cast(ops.quick_get(++i)); #ifdef DEBUG_EXECUTE debug_printf(pool(), " \"%s\"", vstring->string().cstr()); #endif write_no_lang(vstring->string()); break; } case OP_GET_ELEMENT: { // maybe they do ^object.method[] call, remember the fact wcontext->inc_somebody_entered_some_object(); Value *value=get_element(); PUSH(value); break; } case OP_GET_ELEMENT__WRITE: { Value *value=get_element(); write_assign_lang(*value); break; } case OP_CREATE_EWPOOL: { PUSH(wcontext); PUSH((void *)flang); flang=String::UL_PASS_APPENDED; wcontext=NEW WWrapper(pool(), 0 /*empty*/, true /*constructing*/); break; } case OP_REDUCE_EWPOOL: { Value *value=wcontext->result(); flang=static_cast(reinterpret_cast(POP())); wcontext=static_cast(POP()); PUSH(value); break; } case OP_CREATE_RWPOOL: { Value *ncontext=POP(); PUSH(rcontext); PUSH(wcontext); rcontext=ncontext; wcontext=NEW WWrapper(pool(), ncontext, false /*not constructing*/); break; } case OP_REDUCE_RWPOOL: { const String *string=wcontext->get_string(); Value *value; if(string) value=NEW VString(*string); else value=NEW VUnknown(pool()); wcontext=static_cast(POP()); rcontext=POP(); PUSH(value); break; } case OP_CREATE_SWPOOL: { PUSH(wcontext); wcontext=NEW WWrapper(pool(), 0 /*empty*/, false /*not constructing*/); break; } case OP_REDUCE_SWPOOL: { // 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 VUnknown(pool()); wcontext=static_cast(POP()); PUSH(value); break; } // CALL case OP_GET_METHOD_FRAME: { Value *value=POP(); // info: // code compiled so that this one's always method-junction, // not a code-junction Junction *junction=value->get_junction(); if(!junction) THROW(0,0, &value->name(), "(%s) not a method or junction, can not call it", value->type()); bool is_constructor= wcontext->constructing() && // constructing? wcontext->somebody_entered_some_class(); // ^class:method[..]? if(is_constructor) wcontext->constructing(false); VMethodFrame *frame=NEW VMethodFrame(pool(), value->name(), *junction, is_constructor); PUSH(frame); break; } case OP_STORE_PARAM: { Value *value=POP(); VMethodFrame *frame=static_cast(stack.top_value()); frame->store_param(frame->name(), value); break; } case OP_CALL: { #ifdef DEBUG_EXECUTE debug_printf(pool(), "->\n"); #endif VMethodFrame *frame=static_cast(POP()); frame->fill_unspecified_params(); PUSH(self); PUSH(root); PUSH(rcontext); PUSH(wcontext); VStateless_class *called_class=frame->junction.self.get_class(); // not ^name.method call and // is context object or class & is it my class or my parent's class and? VStateless_class *read_class=rcontext->get_class(); if(!wcontext->somebody_entered_some_object() && read_class && read_class->is_or_derived_from(*called_class)) // yes self=rcontext; // class dynamic call else // no, not me or relative of mine (total stranger) // were are constructing something and // our constructor is just method call and // not static-only-method call if(frame->is_constructor && wcontext->somebody_entered_some_object()==1 && frame->junction.method->call_type!=Method::CT_STATIC) { // this is a constructor call // some stateless_object creatable derivates if(Value *value=called_class->create_new_value(pool())) self=value; else // stateful object self=NEW VObject(pool(), *called_class); frame->write(*self, String::UL_CLEAN // not used, always an object, not string ); } else self=&frame->junction.self; // no, static or simple dynamic call frame->set_self(*self); root=rcontext=wcontext=frame; { // take object or class from any wrappers // and substitute class alias to the class they are called AS Temp_alias temp_alias(*self->get_aliased(), *frame->junction.vclass); const Method& method=*frame->junction.method; Method::Call_type call_type= called_class==self ? Method::CT_STATIC : Method::CT_DYNAMIC; if( method.call_type==Method::CT_ANY || method.call_type==call_type) // allowed call type? if(method.native_code) { // native code? method.check_actual_numbered_params(pool(), frame->junction.self, frame->name(), frame->numbered_params()); method.native_code( *this, frame->name(), frame->numbered_params()); // execute it } else { // parser code if(++anti_endless_execute_recoursion==ANTI_ENDLESS_EXECUTE_RECOURSION) { anti_endless_execute_recoursion=0; // give @exception a chance THROW(0, 0, &frame->name(), "endless recursion detected"); } execute(*method.parser_code); // execute it anti_endless_execute_recoursion--; } else THROW(0, 0, &frame->name(), "is not allowed to be called %s", call_type==Method::CT_STATIC?"statically":"dynamically"); } Value *value=wcontext->result(); wcontext=static_cast(POP()); rcontext=POP(); root=POP(); self=static_cast(POP()); PUSH(value); #ifdef DEBUG_EXECUTE debug_printf(pool(), "<-returned"); #endif break; } // expression ops: unary case OP_NEG: { Value *operand=POP(); Value *value=NEW VDouble(pool(), -operand->as_double()); PUSH(value); break; } case OP_INV: { Value *operand=POP(); Value *value=NEW VDouble(pool(), ~operand->as_int()); PUSH(value); break; } case OP_NOT: { Value *operand=POP(); Value *value=NEW VBool(pool(), !operand->as_bool()); PUSH(value); break; } case OP_DEF: { Value *operand=POP(); Value *value=NEW VBool(pool(), operand->is_defined()); PUSH(value); break; } case OP_IN: { Value *operand=POP(); const char *path=operand->as_string().cstr(); Value *value=NEW VBool(pool(), info.uri && strncmp(path, info.uri, strlen(path))==0); PUSH(value); break; } case OP_FEXISTS: { Value *operand=POP(); Value *value=NEW VBool(pool(), file_readable(absolute(operand->as_string()))); PUSH(value); break; } case OP_DEXISTS: { Value *operand=POP(); Value *value=NEW VBool(pool(), dir_readable(absolute(operand->as_string()))); PUSH(value); break; } // expression ops: binary case OP_SUB: { Value *b=POP(); Value *a=POP(); Value *value=NEW VDouble(pool(), a->as_double() - b->as_double()); PUSH(value); break; } case OP_ADD: { Value *b=POP(); Value *a=POP(); Value *value=NEW VDouble(pool(), a->as_double() + b->as_double()); PUSH(value); break; } case OP_MUL: { Value *b=POP(); Value *a=POP(); Value *value=NEW VDouble(pool(), a->as_double() * b->as_double()); PUSH(value); break; } case OP_DIV: { Value *b=POP(); Value *a=POP(); Value *value=NEW VDouble(pool(), a->as_double() / b->as_double()); PUSH(value); break; } case OP_MOD: { Value *b=POP(); Value *a=POP(); Value *value=NEW VDouble(pool(), a->as_int() % b->as_int()); PUSH(value); break; } case OP_BIN_AND: { Value *b=POP(); Value *a=POP(); Value *value=NEW VDouble(pool(), a->as_int() & b->as_int()); PUSH(value); break; } case OP_BIN_OR: { Value *b=POP(); Value *a=POP(); Value *value=NEW VDouble(pool(), a->as_int() | b->as_int()); PUSH(value); break; } case OP_BIN_XOR: { Value *b=POP(); Value *a=POP(); Value *value=NEW VDouble(pool(), a->as_int() ^ b->as_int()); PUSH(value); break; } case OP_LOG_AND: { Value *b=POP(); Value *a=POP(); Value *value=NEW VBool(pool(), a->as_bool() && b->as_bool()); PUSH(value); break; } case OP_LOG_OR: { Value *b=POP(); Value *a=POP(); Value *value=NEW VBool(pool(), a->as_bool() || b->as_bool()); PUSH(value); break; } case OP_LOG_XOR: { Value *b=POP(); Value *a=POP(); Value *value=NEW VBool(pool(), a->as_bool() ^ b->as_bool()); PUSH(value); break; } case OP_NUM_LT: { Value *b=POP(); Value *a=POP(); Value *value=NEW VBool(pool(), a->as_double() < b->as_double()); PUSH(value); break; } case OP_NUM_GT: { Value *b=POP(); Value *a=POP(); Value *value=NEW VBool(pool(), a->as_double() > b->as_double()); PUSH(value); break; } case OP_NUM_LE: { Value *b=POP(); Value *a=POP(); Value *value=NEW VBool(pool(), a->as_double() <= b->as_double()); PUSH(value); break; } case OP_NUM_GE: { Value *b=POP(); Value *a=POP(); Value *value=NEW VBool(pool(), a->as_double() >= b->as_double()); PUSH(value); break; } case OP_NUM_EQ: { Value *b=POP(); Value *a=POP(); Value *value=NEW VBool(pool(), a->as_double() == b->as_double()); PUSH(value); break; } case OP_NUM_NE: { Value *b=POP(); Value *a=POP(); Value *value=NEW VBool(pool(), a->as_double() != b->as_double()); PUSH(value); break; } case OP_STR_LT: { Value *b=POP(); Value *a=POP(); Value *value=NEW VBool(pool(), a->as_string() < b->as_string()); PUSH(value); break; } case OP_STR_GT: { Value *b=POP(); Value *a=POP(); Value *value=NEW VBool(pool(), a->as_string() > b->as_string()); PUSH(value); break; } case OP_STR_LE: { Value *b=POP(); Value *a=POP(); Value *value=NEW VBool(pool(), a->as_string() <= b->as_string()); PUSH(value); break; } case OP_STR_GE: { Value *b=POP(); Value *a=POP(); Value *value=NEW VBool(pool(), a->as_string() >= b->as_string()); PUSH(value); break; } case OP_STR_EQ: { Value *b=POP(); Value *a=POP(); Value *value=NEW VBool(pool(), a->as_string() == b->as_string()); PUSH(value); break; } case OP_STR_NE: { Value *b=POP(); Value *a=POP(); Value *value=NEW VBool(pool(), a->as_string() != b->as_string()); PUSH(value); break; } case OP_IS: { Value *b=POP(); Value *a=POP(); Value *value=NEW VBool(pool(), b->as_string() == a->type()); PUSH(value); break; } default: THROW(0,0, 0, "invalid opcode %d", op.code); } } } Value *Request::get_element() { const String& name=POP_NAME(); Value *ncontext=POP(); Value *value/*; if(Method* method=OP.get_method(name)) { // operator? // as if that method were in self and we have normal dynamic method here Junction& junction=*NEW Junction(pool(), *self, self->get_class(), method, 0,0,0,0); value=NEW VJunction(junction); } else value*/=ncontext->get_element(name); if(value) value=&process(*value, &name); // process possible code-junction else { value=NEW VUnknown(pool()); value->set_name(name); } return value; } /** @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 */ Value& Request::process(Value& value, const String *name, bool intercept_string) { Value *result; Junction *junction=value.get_junction(); if(junction && junction->code) { // is it a code-junction? // process it #ifdef DEBUG_EXECUTE debug_printf(pool(), "ja->\n"); #endif PUSH(self); PUSH(root); PUSH(rcontext); PUSH(wcontext); WContext *frame; // 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 frame=NEW VCodeFrame(pool(), *junction->wcontext); } else { // plain wwrapper frame=NEW WWrapper(pool(), 0/*empty*/, false/*not constructing*/); } wcontext=frame; self=&junction->self; root=junction->root; rcontext=junction->rcontext; execute(*junction->code); if(using_code_frame) { // CodeFrame soul: // string writes were intercepted // returning them as the result of getting code-junction result=NEW VString(*frame->get_string()); } else result=frame->result(); wcontext=static_cast(POP()); rcontext=POP(); root=POP(); self=static_cast(POP()); #ifdef DEBUG_EXECUTE debug_printf(pool(), "<-ja returned"); #endif } else result=&value; if(name) result->set_name(*name); return *result; } const String *Request::execute_method(Value& aself, const Method& method, bool return_cstr) { PUSH(self); PUSH(root); PUSH(rcontext); PUSH(wcontext); // initialize contexts root=rcontext=self=&aself; wcontext=NEW WWrapper(pool(), &aself, false /*not constructing*/); // execute! execute(*method.parser_code); // result const String *result; if(return_cstr) result=&wcontext->as_string(); else result=0; // ignore result wcontext=static_cast(POP()); rcontext=POP(); root=POP(); self=static_cast(POP()); // return return result; } const String *Request::execute_method(Value& aself, const String& method_name, bool return_cstr) { if(Value *value=aself.get_element(method_name)) if(Junction *junction=value->get_junction()) if(const Method *method=junction->method) return execute_method(aself, *method, return_cstr); return 0; }