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1.1 paf 1: /*
1.88 paf 2: Parser
3: Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
1.89 paf 4: Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
1.88 paf 5:
1.109 ! paf 6: $Id: execute.C,v 1.108 2001/03/16 09:26:43 paf Exp $
1.1 paf 7: */
8:
1.8 paf 9: #include "pa_array.h"
1.1 paf 10: #include "code.h"
1.11 paf 11: #include "pa_request.h"
1.15 paf 12: #include "pa_vstring.h"
1.22 paf 13: #include "pa_vhash.h"
1.23 paf 14: #include "pa_vunknown.h"
1.34 paf 15: #include "pa_vcframe.h"
16: #include "pa_vmframe.h"
1.38 paf 17: #include "pa_vobject.h"
1.49 paf 18: #include "pa_vdouble.h"
1.54 paf 19: #include "pa_vbool.h"
1.94 paf 20: #include "pa_vtable.h"
1.1 paf 21:
22: #include <stdio.h>
23:
1.24 paf 24: #define PUSH(value) stack.push(value)
25: #define POP() static_cast<Value *>(stack.pop())
1.32 paf 26: #define POP_NAME() static_cast<Value *>(stack.pop())->as_string()
1.24 paf 27:
1.11 paf 28:
1.1 paf 29: char *opcode_name[]={
1.49 paf 30: // literals
1.109 ! paf 31: "VALUE", "CURLY_CODE__STORE_PARAM", "EXPR_CODE__STORE_PARAM",
1.49 paf 32:
33: // actions
1.51 paf 34: "WITH_SELF", "WITH_ROOT", "WITH_READ", "WITH_WRITE",
1.66 paf 35: "GET_CLASS",
1.80 paf 36: "CONSTRUCT_VALUE", "CONSTRUCT_DOUBLE",
1.108 paf 37: "WRITE_VALUE", "WRITE_EXPR_RESULT", "STRING__WRITE",
1.18 paf 38: "GET_ELEMENT", "GET_ELEMENT__WRITE",
1.1 paf 39: "CREATE_EWPOOL", "REDUCE_EWPOOL",
40: "CREATE_RWPOOL", "REDUCE_RWPOOL",
1.49 paf 41: "CREATE_SWPOOL", "REDUCE_SWPOOL",
1.1 paf 42: "GET_METHOD_FRAME",
43: "STORE_PARAM",
1.51 paf 44: "CALL",
1.49 paf 45:
46: // expression ops: unary
47: "NEG", "INV", "NOT", "DEF", "IN", "FEXISTS",
48: // expression ops: binary
49: "SUB", "ADD", "MUL", "DIV", "MOD",
1.56 paf 50: "BIN_AND", "BIN_OR", "BIN_XOR",
51: "LOG_AND", "LOG_OR", "LOG_XOR",
1.49 paf 52: "NUM_LT", "NUM_GT", "NUM_LE", "NUM_GE", "NUM_EQ", "NUM_NE",
1.103 paf 53: "STR_LT", "STR_GT", "STR_LE", "STR_GE", "STR_EQ", "STR_NE",
54: "IS"
1.1 paf 55: };
56:
1.107 paf 57: void va_log_printf(const char *fmt,va_list args) {
58: vfprintf(stderr, fmt, args);
59: }
60:
1.105 paf 61: void log_printf(const char *fmt, ...) {
62: // TODO: куда-нибудь пристроить
1.107 paf 63: va_list args;
64: va_start(args,fmt);
65: va_log_printf(fmt,args);
66: va_end(args);
1.105 paf 67: }
68:
1.9 paf 69: void dump(int level, const Array& ops) {
1.23 paf 70: if(0){
71: int size=ops.size();
1.105 paf 72: //log_printf("size=%d\n", size);
1.23 paf 73: for(int i=0; i<size; i++) {
74: Operation op;
75: op.cast=ops.quick_get(i);
1.105 paf 76: log_printf("%8X\n", op.cast);
1.23 paf 77: }
78: }
79:
1.9 paf 80: int size=ops.size();
1.105 paf 81: //log_printf("size=%d\n", size);
1.1 paf 82: for(int i=0; i<size; i++) {
1.23 paf 83: Operation op;
84: op.cast=ops.quick_get(i);
1.105 paf 85: log_printf("%*s%s", level*4, "", opcode_name[op.code]);
1.1 paf 86:
1.86 paf 87: if(op.code==OP_VALUE || op.code==OP_STRING__WRITE) {
1.52 paf 88: Value *value=static_cast<Value *>(ops.quick_get(++i));
1.105 paf 89: log_printf(" \"%s\" %s", value->get_string()->cstr(), value->type());
1.15 paf 90: }
1.105 paf 91: log_printf("\n");
1.1 paf 92:
1.109 ! paf 93: if(op.code==OP_CURLY_CODE__STORE_PARAM || op.code==OP_EXPR_CODE__STORE_PARAM) {
1.10 paf 94: const Array *local_ops=reinterpret_cast<const Array *>(ops.quick_get(++i));
1.9 paf 95: dump(level+1, *local_ops);
1.1 paf 96: }
97: }
98: }
99:
1.32 paf 100: void Request::execute(const Array& ops) {
1.30 paf 101: if(1) {
1.105 paf 102: log_printf("source----------------------------\n");
1.12 paf 103: dump(0, ops);
1.105 paf 104: log_printf("execution-------------------------\n");
1.12 paf 105: }
106:
1.11 paf 107: int size=ops.size();
1.105 paf 108: //log_printf("size=%d\n", size);
1.11 paf 109: for(int i=0; i<size; i++) {
1.23 paf 110: Operation op;
111: op.cast=ops.quick_get(i);
1.105 paf 112: log_printf("%d:%s", stack.top_index()+1, opcode_name[op.code]);
1.11 paf 113:
1.23 paf 114: switch(op.code) {
1.51 paf 115: // param in next instruction
1.52 paf 116: case OP_VALUE:
1.32 paf 117: {
1.52 paf 118: Value *value=static_cast<Value *>(ops.quick_get(++i));
1.105 paf 119: log_printf(" \"%s\" %s", value->get_string()->cstr(), value->type());
1.52 paf 120: PUSH(value);
1.32 paf 121: break;
122: }
1.109 ! paf 123: case OP_CURLY_CODE__STORE_PARAM:
! 124: case OP_EXPR_CODE__STORE_PARAM:
1.32 paf 125: {
1.73 paf 126: VMethodFrame *frame=static_cast<VMethodFrame *>(stack.top_value());
1.65 paf 127: // code
1.32 paf 128: const Array *local_ops=reinterpret_cast<const Array *>(ops.quick_get(++i));
1.105 paf 129: log_printf(" (%d)\n", local_ops->size());
1.38 paf 130: dump(1, *local_ops);
1.63 paf 131:
1.109 ! paf 132: // when they evaluate expression parameter,
! 133: // the object expression result
! 134: // does not need to be written into calling frame
! 135: // it must go into any expressions using that parameter
! 136: // hence, zeroing junction.wcontext being created
! 137: // later, in .process would test that field
! 138: // in decision "which wwrapper to use"
1.32 paf 139: Junction& j=*NEW Junction(pool(),
1.45 paf 140: *self, 0, 0,
1.109 ! paf 141: root, frame, op.code==OP_EXPR_CODE__STORE_PARAM?0:frame, local_ops);
1.32 paf 142:
143: Value *value=NEW VJunction(j);
1.65 paf 144:
145: // store param
1.92 paf 146: frame->store_param(frame->name(), value);
1.32 paf 147: break;
148: }
1.66 paf 149: case OP_GET_CLASS:
1.38 paf 150: {
1.98 paf 151: // maybe the do ^class:method[] call, remember the fact
152: wcontext->set_somebody_entered_some_class();
153:
1.82 paf 154: const String& name=POP_NAME();
1.66 paf 155: VClass *vclass=static_cast<VClass *>(classes().get(name));
156: if(!vclass)
157: THROW(0,0,
158: &name,
159: ": undefined class");
160:
161: PUSH(vclass);
1.38 paf 162: break;
163: }
1.32 paf 164:
1.51 paf 165: // OP_WITH
1.37 paf 166: case OP_WITH_SELF:
167: {
168: PUSH(self);
169: break;
170: }
171: case OP_WITH_ROOT:
1.11 paf 172: {
1.37 paf 173: PUSH(root);
1.13 paf 174: break;
1.11 paf 175: }
1.15 paf 176: case OP_WITH_READ:
177: {
1.24 paf 178: PUSH(rcontext);
1.20 paf 179: break;
180: }
1.37 paf 181: case OP_WITH_WRITE:
1.20 paf 182: {
1.37 paf 183: PUSH(wcontext);
1.20 paf 184: break;
185: }
1.37 paf 186:
1.51 paf 187: // OTHER ACTIONS BUT WITHs
1.80 paf 188: case OP_CONSTRUCT_VALUE:
1.20 paf 189: {
1.37 paf 190: Value *value=POP();
1.82 paf 191: const String& name=POP_NAME();
1.37 paf 192: Value *ncontext=POP();
1.81 paf 193: ncontext->put_element(name, value);
1.37 paf 194: value->set_name(name);
1.15 paf 195: break;
196: }
1.80 paf 197: case OP_CONSTRUCT_EXPR:
198: {
199: Value *value=POP();
1.82 paf 200: const String& name=POP_NAME();
1.80 paf 201: Value *ncontext=POP();
1.81 paf 202: ncontext->put_element(name, value->get_expr_result());
1.80 paf 203: value->set_name(name);
204: break;
205: }
1.108 paf 206: case OP_WRITE_VALUE:
1.13 paf 207: {
1.24 paf 208: Value *value=POP();
1.92 paf 209: write_assign_lang(*value);
1.86 paf 210: break;
211: }
1.108 paf 212: case OP_WRITE_EXPR_RESULT:
213: {
214: Value *value=POP();
215: write_expr_result(*value->get_expr_result());
216: break;
217: }
1.86 paf 218: case OP_STRING__WRITE:
219: {
220: VString *vstring=static_cast<VString *>(ops.quick_get(++i));
1.108 paf 221: log_printf(" \"%s\"", vstring->string().cstr());
222: write(vstring->string());
1.13 paf 223: break;
1.14 paf 224: }
1.13 paf 225:
1.15 paf 226: case OP_GET_ELEMENT:
1.11 paf 227: {
1.17 paf 228: Value *value=get_element();
1.24 paf 229: PUSH(value);
1.17 paf 230: break;
231: }
232:
1.18 paf 233: case OP_GET_ELEMENT__WRITE:
1.17 paf 234: {
235: Value *value=get_element();
1.92 paf 236: write_assign_lang(*value);
1.17 paf 237: break;
238: }
239:
1.32 paf 240:
1.17 paf 241: case OP_CREATE_EWPOOL:
242: {
1.24 paf 243: PUSH(wcontext);
1.43 paf 244: wcontext=NEW WWrapper(pool(), 0 /* empty */, true /* constructing */);
1.17 paf 245: break;
246: }
247: case OP_REDUCE_EWPOOL:
248: {
1.36 paf 249: Value *value=wcontext->result();
1.25 paf 250: wcontext=static_cast<WContext *>(POP());
1.24 paf 251: PUSH(value);
1.13 paf 252: break;
1.15 paf 253: }
1.13 paf 254:
1.26 paf 255: case OP_CREATE_RWPOOL:
256: {
257: Value *ncontext=POP();
258: PUSH(rcontext);
259: rcontext=ncontext;
260: PUSH(wcontext);
1.43 paf 261: wcontext=NEW WWrapper(pool(), ncontext, false /* not constructing */);
1.26 paf 262: break;
263: }
264: case OP_REDUCE_RWPOOL:
265: {
1.82 paf 266: const String *string=wcontext->get_string();
1.80 paf 267: Value *value;
268: if(string)
269: value=NEW VString(*string);
270: else
271: value=NEW VUnknown(pool());
1.26 paf 272: wcontext=static_cast<WContext *>(POP());
273: rcontext=POP();
274: PUSH(value);
275: break;
276: }
1.49 paf 277: case OP_CREATE_SWPOOL:
278: {
279: PUSH(wcontext);
1.50 paf 280: wcontext=NEW WWrapper(pool(), 0 /* empty */, false /* not constructing */);
1.49 paf 281: break;
282: }
283: case OP_REDUCE_SWPOOL:
284: {
285: // from "$a $b" part of expression taking only string value,
286: // ignoring any other content of wcontext
1.82 paf 287: const String *string=wcontext->get_string();
1.80 paf 288: Value *value;
289: if(string)
290: value=NEW VString(*string);
291: else
292: NEW VUnknown(pool());
1.50 paf 293: wcontext=static_cast<WContext *>(POP());
1.49 paf 294: PUSH(value);
295: break;
296: }
297:
1.51 paf 298: // CALL
1.28 paf 299: case OP_GET_METHOD_FRAME:
300: {
1.32 paf 301: Value *value=POP();
1.70 paf 302: // info: this one's always method-junction, not a code-junction
1.32 paf 303: Junction *junction=value->get_junction();
1.31 paf 304: if(!junction)
1.28 paf 305: THROW(0,0,
1.42 paf 306: &value->name(),
1.95 paf 307: "(%s) uncallable, must be method or junction",
1.38 paf 308: value->type());
1.70 paf 309:
1.34 paf 310: VMethodFrame *frame=NEW VMethodFrame(pool(), *junction);
1.106 paf 311: frame->set_name(value->name());
1.28 paf 312: PUSH(frame);
313: break;
314: }
315: case OP_STORE_PARAM:
316: {
317: Value *value=POP();
1.73 paf 318: VMethodFrame *frame=static_cast<VMethodFrame *>(stack.top_value());
1.92 paf 319: frame->store_param(frame->name(), value);
1.29 paf 320: break;
321: }
322:
323: case OP_CALL:
324: {
1.105 paf 325: log_printf("->\n");
1.34 paf 326: VMethodFrame *frame=static_cast<VMethodFrame *>(POP());
327: frame->fill_unspecified_params();
1.45 paf 328: PUSH(self);
329: PUSH(root);
330: PUSH(rcontext);
331: PUSH(wcontext);
332:
1.100 paf 333: VStateless_class *called_class=frame->junction.self.get_class();
1.74 paf 334: // is context object or class & is it my class or my parent's class?
1.100 paf 335: VStateless_class *read_class=rcontext->get_class();
1.74 paf 336: if(read_class && read_class->is_or_derived_from(*called_class)) // yes
337: self=rcontext; // class dynamic call
1.75 paf 338: else // no, not me or relative of mine (total stranger)
1.98 paf 339: if(
340: wcontext->constructing() && // constructing?
341: wcontext->somebody_entered_some_class()) { // ^class:method[..]?
342: // yes, this is a constructor call
1.94 paf 343: if(called_class->name()==TABLE_CLASS_NAME)
344: self=NEW VTable(pool());
1.101 paf 345: else if(called_class->name()==ENV_CLASS_NAME)
346: self=NEW VEnv(pool());
1.94 paf 347: else
348: self=NEW VObject(pool(), *called_class);
1.83 paf 349: frame->write(*self,
350: String::Untaint_lang::NO // not used, always an object, not string
351: );
1.75 paf 352: } else
353: self=&frame->junction.self; // no, static or simple dynamic call
354:
1.45 paf 355: frame->set_self(*self);
1.29 paf 356: root=rcontext=wcontext=frame;
1.47 paf 357: {
1.48 paf 358: // take object or class from any wrappers
1.102 paf 359: // and substitute class alias to the class they are called AS
360: Temp_alias temp_alias(*self->get_aliased(), *frame->junction.vclass);
1.68 paf 361:
1.99 paf 362: const Method& method=*frame->junction.method;
1.80 paf 363: if(method.native_code) { // native code?
1.92 paf 364: method.check_actual_numbered_params(
365: frame->name(), frame->numbered_params());
366: (*method.native_code)(*this,
367: frame->name(), frame->numbered_params()); // execute it
1.80 paf 368: } else // parser code
1.69 paf 369: execute(*method.parser_code); // execute it
1.47 paf 370: }
1.36 paf 371: Value *value=wcontext->result();
1.45 paf 372:
373: wcontext=static_cast<WContext *>(POP());
374: rcontext=POP();
375: root=POP();
376: self=static_cast<VAliased *>(POP());
1.62 paf 377:
1.61 paf 378: PUSH(value);
1.105 paf 379: log_printf("<-returned");
1.49 paf 380: break;
381: }
382:
1.55 paf 383: // expression ops: unary
384: case OP_NEG:
385: {
386: Value *operand=POP();
1.80 paf 387: Value *value=NEW VDouble(pool(), -operand->get_double());
1.55 paf 388: PUSH(value);
389: break;
390: }
391: case OP_INV:
392: {
393: Value *operand=POP();
1.97 paf 394: Value *value=NEW VDouble(pool(), ~(int)operand->get_double());
1.55 paf 395: PUSH(value);
396: break;
397: }
398: case OP_NOT:
399: {
400: Value *operand=POP();
1.78 paf 401: Value *value=NEW VBool(pool(), !operand->get_bool());
1.55 paf 402: PUSH(value);
403: break;
404: }
1.62 paf 405: case OP_DEF:
406: {
407: Value *operand=POP();
1.78 paf 408: Value *value=NEW VBool(pool(), operand->get_defined());
1.62 paf 409: PUSH(value);
410: break;
411: }
412: case OP_IN:
413: {
414: Value *operand=POP();
1.78 paf 415: Value *value=NEW VBool(pool(), true/*TODO*/);
1.62 paf 416: PUSH(value);
417: break;
418: }
419: case OP_FEXISTS:
420: {
421: Value *operand=POP();
1.78 paf 422: Value *value=NEW VBool(pool(), true/*TODO*/);
1.62 paf 423: PUSH(value);
424: break;
425: }
1.55 paf 426:
427: // expression ops: binary
428: case OP_SUB:
1.53 paf 429: {
1.61 paf 430: Value *b=POP(); Value *a=POP();
1.80 paf 431: Value *value=NEW VDouble(pool(), a->get_double() - b->get_double());
1.53 paf 432: PUSH(value);
433: break;
434: }
1.55 paf 435: case OP_ADD:
1.53 paf 436: {
1.61 paf 437: Value *b=POP(); Value *a=POP();
1.80 paf 438: Value *value=NEW VDouble(pool(), a->get_double() + b->get_double());
1.53 paf 439: PUSH(value);
440: break;
441: }
1.49 paf 442: case OP_MUL:
443: {
1.61 paf 444: Value *b=POP(); Value *a=POP();
1.80 paf 445: Value *value=NEW VDouble(pool(), a->get_double() * b->get_double());
1.53 paf 446: PUSH(value);
447: break;
448: }
449: case OP_DIV:
450: {
1.61 paf 451: Value *b=POP(); Value *a=POP();
1.80 paf 452: Value *value=NEW VDouble(pool(), a->get_double() / b->get_double());
1.54 paf 453: PUSH(value);
454: break;
455: }
1.55 paf 456: case OP_MOD:
457: {
1.61 paf 458: Value *b=POP(); Value *a=POP();
1.78 paf 459: Value *value=NEW VDouble(pool(),
1.97 paf 460: (int)a->get_double() %
461: (int)b->get_double());
1.55 paf 462: PUSH(value);
463: break;
464: }
465: case OP_BIN_AND:
1.54 paf 466: {
1.61 paf 467: Value *b=POP(); Value *a=POP();
1.78 paf 468: Value *value=NEW VDouble(pool(),
1.97 paf 469: (int)a->get_double() &
470: (int)b->get_double());
1.54 paf 471: PUSH(value);
472: break;
473: }
1.55 paf 474: case OP_BIN_OR:
1.54 paf 475: {
1.61 paf 476: Value *b=POP(); Value *a=POP();
1.78 paf 477: Value *value=NEW VDouble(pool(),
1.97 paf 478: (int)a->get_double() |
479: (int)b->get_double());
1.55 paf 480: PUSH(value);
481: break;
482: }
1.56 paf 483: case OP_BIN_XOR:
484: {
1.61 paf 485: Value *b=POP(); Value *a=POP();
1.78 paf 486: Value *value=NEW VDouble(pool(),
1.97 paf 487: (int)a->get_double() ^
488: (int)b->get_double());
1.56 paf 489: PUSH(value);
490: break;
491: }
1.55 paf 492: case OP_LOG_AND:
493: {
1.61 paf 494: Value *b=POP(); Value *a=POP();
1.78 paf 495: Value *value=NEW VBool(pool(), a->get_bool() && b->get_bool());
1.55 paf 496: PUSH(value);
497: break;
498: }
499: case OP_LOG_OR:
500: {
1.61 paf 501: Value *b=POP(); Value *a=POP();
1.78 paf 502: Value *value=NEW VBool(pool(), a->get_bool() || b->get_bool());
1.56 paf 503: PUSH(value);
504: break;
505: }
506: case OP_LOG_XOR:
507: {
1.61 paf 508: Value *b=POP(); Value *a=POP();
1.78 paf 509: Value *value=NEW VBool(pool(), a->get_bool() ^ b->get_bool());
1.55 paf 510: PUSH(value);
511: break;
512: }
513: case OP_NUM_LT:
514: {
1.61 paf 515: Value *b=POP(); Value *a=POP();
1.78 paf 516: Value *value=NEW VBool(pool(), a->get_double() < b->get_double());
1.55 paf 517: PUSH(value);
518: break;
519: }
520: case OP_NUM_GT:
521: {
1.61 paf 522: Value *b=POP(); Value *a=POP();
1.78 paf 523: Value *value=NEW VBool(pool(), a->get_double() > b->get_double());
1.55 paf 524: PUSH(value);
525: break;
526: }
527: case OP_NUM_LE:
528: {
1.61 paf 529: Value *b=POP(); Value *a=POP();
1.78 paf 530: Value *value=NEW VBool(pool(), a->get_double() <= b->get_double());
1.55 paf 531: PUSH(value);
532: break;
533: }
534: case OP_NUM_GE:
535: {
1.61 paf 536: Value *b=POP(); Value *a=POP();
1.78 paf 537: Value *value=NEW VBool(pool(), a->get_double() >= b->get_double());
1.55 paf 538: PUSH(value);
539: break;
540: }
541: case OP_NUM_EQ:
542: {
1.61 paf 543: Value *b=POP(); Value *a=POP();
1.78 paf 544: Value *value=NEW VBool(pool(), a->get_double() == b->get_double());
1.55 paf 545: PUSH(value);
546: break;
547: }
548: case OP_NUM_NE:
549: {
1.61 paf 550: Value *b=POP(); Value *a=POP();
1.78 paf 551: Value *value=NEW VBool(pool(), a->get_double() != b->get_double());
1.54 paf 552: PUSH(value);
553: break;
554: }
1.58 paf 555: case OP_STR_LT:
556: {
1.61 paf 557: Value *b=POP(); Value *a=POP();
1.78 paf 558: Value *value=NEW VBool(pool(), a->as_string() < b->as_string());
1.58 paf 559: PUSH(value);
560: break;
561: }
562: case OP_STR_GT:
563: {
1.61 paf 564: Value *b=POP(); Value *a=POP();
1.78 paf 565: Value *value=NEW VBool(pool(), a->as_string() > b->as_string());
1.58 paf 566: PUSH(value);
567: break;
568: }
1.55 paf 569: case OP_STR_LE:
1.58 paf 570: {
1.61 paf 571: Value *b=POP(); Value *a=POP();
1.78 paf 572: Value *value=NEW VBool(pool(), a->as_string() <= b->as_string());
1.58 paf 573: PUSH(value);
574: break;
575: }
1.55 paf 576: case OP_STR_GE:
1.54 paf 577: {
1.61 paf 578: Value *b=POP(); Value *a=POP();
1.78 paf 579: Value *value=NEW VBool(pool(), a->as_string() >= b->as_string());
1.58 paf 580: PUSH(value);
581: break;
582: }
583: case OP_STR_EQ:
584: {
1.61 paf 585: Value *b=POP(); Value *a=POP();
1.78 paf 586: Value *value=NEW VBool(pool(), a->as_string() == b->as_string());
1.58 paf 587: PUSH(value);
588: break;
589: }
590: case OP_STR_NE:
591: {
1.61 paf 592: Value *b=POP(); Value *a=POP();
1.78 paf 593: Value *value=NEW VBool(pool(), a->as_string() != b->as_string());
1.103 paf 594: PUSH(value);
595: break;
596: }
597: case OP_IS:
598: {
599: Value *b=POP(); Value *a=POP();
600: Value *value=NEW VBool(pool(), b->as_string() == a->type());
1.49 paf 601: PUSH(value);
1.28 paf 602: break;
603: }
604:
1.11 paf 605: default:
1.67 paf 606: THROW(0,0,
607: 0,
608: "unhandled '%s' opcode", opcode_name[op.code]);
1.11 paf 609: }
1.105 paf 610: log_printf("\n");
1.11 paf 611: }
1.1 paf 612: }
1.17 paf 613:
614: Value *Request::get_element() {
1.82 paf 615: const String& name=POP_NAME();
1.24 paf 616: Value *ncontext=POP();
1.32 paf 617: Value *value=ncontext->get_element(name);
1.21 paf 618:
1.76 paf 619: if(value)
1.92 paf 620: value=&process(*value, &name); // process possible code-junction
1.76 paf 621: else {
622: value=NEW VUnknown(pool());
623: value->set_name(name);
624: }
1.63 paf 625:
1.17 paf 626: return value;
1.34 paf 627: }
1.70 paf 628:
1.92 paf 629: Value& Request::process(Value& value, const String *name, bool intercept_string) {
1.90 paf 630: // intercept_string:
631: // true:
632: // they want result=string value,
633: // possible object result goes to wcontext
634: // false:
635: // they want any result[string|object]
636: // nothing goes to wcontext.
637: // used in (expression) params evaluation
638:
1.91 paf 639: Value *result;
1.70 paf 640: Junction *junction=value.get_junction();
641: if(junction && junction->code) { // is it a code-junction?
1.92 paf 642: // process it
1.105 paf 643: log_printf("ja->\n");
1.70 paf 644: PUSH(self);
645: PUSH(root);
646: PUSH(rcontext);
647: PUSH(wcontext);
648:
1.71 paf 649: WContext *frame;
1.109 ! paf 650: // for expression method params
! 651: // wcontext is set 0
! 652: // using the fact in decision "which wwrapper to use"
! 653: bool using_code_frame=intercept_string && junction->wcontext;
! 654: if(using_code_frame) {
1.71 paf 655: // almost plain wwrapper about junction wcontext,
656: // BUT intercepts string writes
657: frame=NEW VCodeFrame(pool(), *junction->wcontext);
658: } else {
659: // plain wwrapper
1.108 paf 660: frame=NEW WWrapper(pool(), 0/*empty*/, false/*not constructing*/);
1.71 paf 661: }
662:
663: wcontext=frame;
1.70 paf 664: self=&junction->self;
665: root=junction->root;
666: rcontext=junction->rcontext;
667: execute(*junction->code);
1.109 ! paf 668: if(using_code_frame) {
1.71 paf 669: // CodeFrame soul:
670: // string writes were intercepted
671: // returning them as the result of getting code-junction
672: result=NEW VString(*frame->get_string());
673: } else
674: result=frame->result();
1.70 paf 675:
676: wcontext=static_cast<WContext *>(POP());
677: rcontext=POP();
678: root=POP();
679: self=static_cast<VAliased *>(POP());
680:
1.105 paf 681: log_printf("<-ja returned");
1.70 paf 682: } else
1.91 paf 683: result=&value;
684:
685: if(name)
686: result->set_name(*name);
687: return *result;
1.85 paf 688: }
689:
1.99 paf 690: char *Request::execute_method(Value& aself, const Method& method, bool return_cstr) {
691: PUSH(self);
692: PUSH(root);
693: PUSH(rcontext);
694: PUSH(wcontext);
695:
696: // initialize contexts
697: root=rcontext=self=&aself;
698: wcontext=NEW WWrapper(pool(), &aself, false /* not constructing */);
699:
700: // execute!
701: execute(*method.parser_code);
702:
703: // result
704: char *result;
705: if(return_cstr)
706: result=wcontext->get_string()->cstr(); // chars
707: else
708: result=0; // ignore result
709:
710: wcontext=static_cast<WContext *>(POP());
711: rcontext=POP();
712: root=POP();
713: self=static_cast<VAliased *>(POP());
714:
715: // return
716: return result;
717: }
718:
719: char *Request::execute_method(Value& aself,
720: const String& method_name, bool return_cstr) {
721: if(Value *value=aself.get_element(method_name))
722: if(Junction *junction=value->get_junction())
723: if(const Method *method=junction->method)
724: return execute_method(aself, *method, return_cstr);
725:
1.85 paf 726: return 0;
1.70 paf 727: }