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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:
1.113 ! paf 6: $Id: execute.C,v 1.112 2001/03/16 12:30:23 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>
1.110 paf 23: #include <string.h>
1.1 paf 24:
1.24 paf 25: #define PUSH(value) stack.push(value)
26: #define POP() static_cast<Value *>(stack.pop())
1.32 paf 27: #define POP_NAME() static_cast<Value *>(stack.pop())->as_string()
1.24 paf 28:
1.11 paf 29:
1.1 paf 30: char *opcode_name[]={
1.49 paf 31: // literals
1.109 paf 32: "VALUE", "CURLY_CODE__STORE_PARAM", "EXPR_CODE__STORE_PARAM",
1.49 paf 33:
34: // actions
1.51 paf 35: "WITH_SELF", "WITH_ROOT", "WITH_READ", "WITH_WRITE",
1.66 paf 36: "GET_CLASS",
1.80 paf 37: "CONSTRUCT_VALUE", "CONSTRUCT_DOUBLE",
1.108 paf 38: "WRITE_VALUE", "WRITE_EXPR_RESULT", "STRING__WRITE",
1.18 paf 39: "GET_ELEMENT", "GET_ELEMENT__WRITE",
1.1 paf 40: "CREATE_EWPOOL", "REDUCE_EWPOOL",
41: "CREATE_RWPOOL", "REDUCE_RWPOOL",
1.49 paf 42: "CREATE_SWPOOL", "REDUCE_SWPOOL",
1.1 paf 43: "GET_METHOD_FRAME",
44: "STORE_PARAM",
1.51 paf 45: "CALL",
1.49 paf 46:
47: // expression ops: unary
48: "NEG", "INV", "NOT", "DEF", "IN", "FEXISTS",
49: // expression ops: binary
50: "SUB", "ADD", "MUL", "DIV", "MOD",
1.56 paf 51: "BIN_AND", "BIN_OR", "BIN_XOR",
52: "LOG_AND", "LOG_OR", "LOG_XOR",
1.49 paf 53: "NUM_LT", "NUM_GT", "NUM_LE", "NUM_GE", "NUM_EQ", "NUM_NE",
1.103 paf 54: "STR_LT", "STR_GT", "STR_LE", "STR_GE", "STR_EQ", "STR_NE",
55: "IS"
1.1 paf 56: };
57:
1.107 paf 58: void va_log_printf(const char *fmt,va_list args) {
59: vfprintf(stderr, fmt, args);
60: }
61:
1.105 paf 62: void log_printf(const char *fmt, ...) {
63: // TODO: куда-нибудь пристроить
1.107 paf 64: va_list args;
65: va_start(args,fmt);
66: va_log_printf(fmt,args);
67: va_end(args);
1.105 paf 68: }
69:
1.9 paf 70: void dump(int level, const Array& ops) {
1.23 paf 71: if(0){
72: int size=ops.size();
1.105 paf 73: //log_printf("size=%d\n", size);
1.23 paf 74: for(int i=0; i<size; i++) {
75: Operation op;
76: op.cast=ops.quick_get(i);
1.105 paf 77: log_printf("%8X\n", op.cast);
1.23 paf 78: }
79: }
80:
1.9 paf 81: int size=ops.size();
1.105 paf 82: //log_printf("size=%d\n", size);
1.1 paf 83: for(int i=0; i<size; i++) {
1.23 paf 84: Operation op;
85: op.cast=ops.quick_get(i);
1.105 paf 86: log_printf("%*s%s", level*4, "", opcode_name[op.code]);
1.1 paf 87:
1.86 paf 88: if(op.code==OP_VALUE || op.code==OP_STRING__WRITE) {
1.52 paf 89: Value *value=static_cast<Value *>(ops.quick_get(++i));
1.105 paf 90: log_printf(" \"%s\" %s", value->get_string()->cstr(), value->type());
1.15 paf 91: }
1.105 paf 92: log_printf("\n");
1.1 paf 93:
1.109 paf 94: if(op.code==OP_CURLY_CODE__STORE_PARAM || op.code==OP_EXPR_CODE__STORE_PARAM) {
1.10 paf 95: const Array *local_ops=reinterpret_cast<const Array *>(ops.quick_get(++i));
1.9 paf 96: dump(level+1, *local_ops);
1.1 paf 97: }
98: }
99: }
100:
1.32 paf 101: void Request::execute(const Array& ops) {
1.30 paf 102: if(1) {
1.105 paf 103: log_printf("source----------------------------\n");
1.12 paf 104: dump(0, ops);
1.105 paf 105: log_printf("execution-------------------------\n");
1.12 paf 106: }
107:
1.11 paf 108: int size=ops.size();
1.105 paf 109: //log_printf("size=%d\n", size);
1.11 paf 110: for(int i=0; i<size; i++) {
1.23 paf 111: Operation op;
112: op.cast=ops.quick_get(i);
1.105 paf 113: log_printf("%d:%s", stack.top_index()+1, opcode_name[op.code]);
1.11 paf 114:
1.23 paf 115: switch(op.code) {
1.51 paf 116: // param in next instruction
1.52 paf 117: case OP_VALUE:
1.32 paf 118: {
1.52 paf 119: Value *value=static_cast<Value *>(ops.quick_get(++i));
1.105 paf 120: log_printf(" \"%s\" %s", value->get_string()->cstr(), value->type());
1.52 paf 121: PUSH(value);
1.32 paf 122: break;
123: }
1.109 paf 124: case OP_CURLY_CODE__STORE_PARAM:
125: case OP_EXPR_CODE__STORE_PARAM:
1.32 paf 126: {
1.73 paf 127: VMethodFrame *frame=static_cast<VMethodFrame *>(stack.top_value());
1.65 paf 128: // code
1.32 paf 129: const Array *local_ops=reinterpret_cast<const Array *>(ops.quick_get(++i));
1.105 paf 130: log_printf(" (%d)\n", local_ops->size());
1.38 paf 131: dump(1, *local_ops);
1.63 paf 132:
1.109 paf 133: // when they evaluate expression parameter,
134: // the object expression result
135: // does not need to be written into calling frame
136: // it must go into any expressions using that parameter
137: // hence, zeroing junction.wcontext being created
138: // later, in .process would test that field
139: // in decision "which wwrapper to use"
1.32 paf 140: Junction& j=*NEW Junction(pool(),
1.45 paf 141: *self, 0, 0,
1.109 paf 142: root, frame, op.code==OP_EXPR_CODE__STORE_PARAM?0:frame, local_ops);
1.32 paf 143:
144: Value *value=NEW VJunction(j);
1.65 paf 145:
146: // store param
1.92 paf 147: frame->store_param(frame->name(), value);
1.32 paf 148: break;
149: }
1.66 paf 150: case OP_GET_CLASS:
1.38 paf 151: {
1.98 paf 152: // maybe the do ^class:method[] call, remember the fact
153: wcontext->set_somebody_entered_some_class();
154:
1.82 paf 155: const String& name=POP_NAME();
1.66 paf 156: VClass *vclass=static_cast<VClass *>(classes().get(name));
157: if(!vclass)
158: THROW(0,0,
159: &name,
160: ": undefined class");
161:
162: PUSH(vclass);
1.38 paf 163: break;
164: }
1.32 paf 165:
1.51 paf 166: // OP_WITH
1.37 paf 167: case OP_WITH_SELF:
168: {
169: PUSH(self);
170: break;
171: }
172: case OP_WITH_ROOT:
1.11 paf 173: {
1.37 paf 174: PUSH(root);
1.13 paf 175: break;
1.11 paf 176: }
1.15 paf 177: case OP_WITH_READ:
178: {
1.24 paf 179: PUSH(rcontext);
1.20 paf 180: break;
181: }
1.37 paf 182: case OP_WITH_WRITE:
1.20 paf 183: {
1.37 paf 184: PUSH(wcontext);
1.20 paf 185: break;
186: }
1.37 paf 187:
1.51 paf 188: // OTHER ACTIONS BUT WITHs
1.80 paf 189: case OP_CONSTRUCT_VALUE:
1.20 paf 190: {
1.37 paf 191: Value *value=POP();
1.82 paf 192: const String& name=POP_NAME();
1.37 paf 193: Value *ncontext=POP();
1.81 paf 194: ncontext->put_element(name, value);
1.37 paf 195: value->set_name(name);
1.15 paf 196: break;
197: }
1.80 paf 198: case OP_CONSTRUCT_EXPR:
199: {
200: Value *value=POP();
1.82 paf 201: const String& name=POP_NAME();
1.80 paf 202: Value *ncontext=POP();
1.81 paf 203: ncontext->put_element(name, value->get_expr_result());
1.80 paf 204: value->set_name(name);
205: break;
206: }
1.108 paf 207: case OP_WRITE_VALUE:
1.13 paf 208: {
1.24 paf 209: Value *value=POP();
1.92 paf 210: write_assign_lang(*value);
1.86 paf 211: break;
212: }
1.108 paf 213: case OP_WRITE_EXPR_RESULT:
214: {
215: Value *value=POP();
216: write_expr_result(*value->get_expr_result());
217: break;
218: }
1.86 paf 219: case OP_STRING__WRITE:
220: {
221: VString *vstring=static_cast<VString *>(ops.quick_get(++i));
1.108 paf 222: log_printf(" \"%s\"", vstring->string().cstr());
223: write(vstring->string());
1.13 paf 224: break;
1.14 paf 225: }
1.13 paf 226:
1.15 paf 227: case OP_GET_ELEMENT:
1.11 paf 228: {
1.17 paf 229: Value *value=get_element();
1.24 paf 230: PUSH(value);
1.17 paf 231: break;
232: }
233:
1.18 paf 234: case OP_GET_ELEMENT__WRITE:
1.17 paf 235: {
236: Value *value=get_element();
1.92 paf 237: write_assign_lang(*value);
1.17 paf 238: break;
239: }
240:
1.32 paf 241:
1.17 paf 242: case OP_CREATE_EWPOOL:
243: {
1.24 paf 244: PUSH(wcontext);
1.43 paf 245: wcontext=NEW WWrapper(pool(), 0 /* empty */, true /* constructing */);
1.17 paf 246: break;
247: }
248: case OP_REDUCE_EWPOOL:
249: {
1.36 paf 250: Value *value=wcontext->result();
1.25 paf 251: wcontext=static_cast<WContext *>(POP());
1.24 paf 252: PUSH(value);
1.13 paf 253: break;
1.15 paf 254: }
1.13 paf 255:
1.26 paf 256: case OP_CREATE_RWPOOL:
257: {
258: Value *ncontext=POP();
259: PUSH(rcontext);
260: rcontext=ncontext;
261: PUSH(wcontext);
1.43 paf 262: wcontext=NEW WWrapper(pool(), ncontext, false /* not constructing */);
1.26 paf 263: break;
264: }
265: case OP_REDUCE_RWPOOL:
266: {
1.82 paf 267: const String *string=wcontext->get_string();
1.80 paf 268: Value *value;
269: if(string)
270: value=NEW VString(*string);
271: else
272: value=NEW VUnknown(pool());
1.26 paf 273: wcontext=static_cast<WContext *>(POP());
274: rcontext=POP();
275: PUSH(value);
276: break;
277: }
1.49 paf 278: case OP_CREATE_SWPOOL:
279: {
280: PUSH(wcontext);
1.50 paf 281: wcontext=NEW WWrapper(pool(), 0 /* empty */, false /* not constructing */);
1.49 paf 282: break;
283: }
284: case OP_REDUCE_SWPOOL:
285: {
286: // from "$a $b" part of expression taking only string value,
287: // ignoring any other content of wcontext
1.82 paf 288: const String *string=wcontext->get_string();
1.80 paf 289: Value *value;
290: if(string)
291: value=NEW VString(*string);
292: else
293: NEW VUnknown(pool());
1.50 paf 294: wcontext=static_cast<WContext *>(POP());
1.49 paf 295: PUSH(value);
296: break;
297: }
298:
1.51 paf 299: // CALL
1.28 paf 300: case OP_GET_METHOD_FRAME:
301: {
1.32 paf 302: Value *value=POP();
1.111 paf 303: // info:
304: // code compiled so that this one's always method-junction,
305: // not a code-junction
1.32 paf 306: Junction *junction=value->get_junction();
1.31 paf 307: if(!junction)
1.28 paf 308: THROW(0,0,
1.42 paf 309: &value->name(),
1.111 paf 310: "(%s) not a method or junction, can not call it",
1.38 paf 311: value->type());
1.70 paf 312:
1.34 paf 313: VMethodFrame *frame=NEW VMethodFrame(pool(), *junction);
1.106 paf 314: frame->set_name(value->name());
1.28 paf 315: PUSH(frame);
316: break;
317: }
318: case OP_STORE_PARAM:
319: {
320: Value *value=POP();
1.73 paf 321: VMethodFrame *frame=static_cast<VMethodFrame *>(stack.top_value());
1.92 paf 322: frame->store_param(frame->name(), value);
1.29 paf 323: break;
324: }
325:
326: case OP_CALL:
327: {
1.105 paf 328: log_printf("->\n");
1.34 paf 329: VMethodFrame *frame=static_cast<VMethodFrame *>(POP());
330: frame->fill_unspecified_params();
1.45 paf 331: PUSH(self);
332: PUSH(root);
333: PUSH(rcontext);
334: PUSH(wcontext);
335:
1.100 paf 336: VStateless_class *called_class=frame->junction.self.get_class();
1.74 paf 337: // is context object or class & is it my class or my parent's class?
1.100 paf 338: VStateless_class *read_class=rcontext->get_class();
1.74 paf 339: if(read_class && read_class->is_or_derived_from(*called_class)) // yes
340: self=rcontext; // class dynamic call
1.75 paf 341: else // no, not me or relative of mine (total stranger)
1.98 paf 342: if(
343: wcontext->constructing() && // constructing?
344: wcontext->somebody_entered_some_class()) { // ^class:method[..]?
345: // yes, this is a constructor call
1.94 paf 346: if(called_class->name()==TABLE_CLASS_NAME)
347: self=NEW VTable(pool());
1.101 paf 348: else if(called_class->name()==ENV_CLASS_NAME)
349: self=NEW VEnv(pool());
1.94 paf 350: else
351: self=NEW VObject(pool(), *called_class);
1.83 paf 352: frame->write(*self,
353: String::Untaint_lang::NO // not used, always an object, not string
354: );
1.75 paf 355: } else
356: self=&frame->junction.self; // no, static or simple dynamic call
357:
1.45 paf 358: frame->set_self(*self);
1.29 paf 359: root=rcontext=wcontext=frame;
1.47 paf 360: {
1.48 paf 361: // take object or class from any wrappers
1.102 paf 362: // and substitute class alias to the class they are called AS
363: Temp_alias temp_alias(*self->get_aliased(), *frame->junction.vclass);
1.68 paf 364:
1.99 paf 365: const Method& method=*frame->junction.method;
1.80 paf 366: if(method.native_code) { // native code?
1.92 paf 367: method.check_actual_numbered_params(
1.113 ! paf 368: frame->junction.self,
1.92 paf 369: frame->name(), frame->numbered_params());
1.113 ! paf 370: (*method.native_code)(
! 371: *this,
1.92 paf 372: frame->name(), frame->numbered_params()); // execute it
1.80 paf 373: } else // parser code
1.69 paf 374: execute(*method.parser_code); // execute it
1.47 paf 375: }
1.36 paf 376: Value *value=wcontext->result();
1.45 paf 377:
378: wcontext=static_cast<WContext *>(POP());
379: rcontext=POP();
380: root=POP();
381: self=static_cast<VAliased *>(POP());
1.62 paf 382:
1.61 paf 383: PUSH(value);
1.105 paf 384: log_printf("<-returned");
1.49 paf 385: break;
386: }
387:
1.55 paf 388: // expression ops: unary
389: case OP_NEG:
390: {
391: Value *operand=POP();
1.80 paf 392: Value *value=NEW VDouble(pool(), -operand->get_double());
1.55 paf 393: PUSH(value);
394: break;
395: }
396: case OP_INV:
397: {
398: Value *operand=POP();
1.97 paf 399: Value *value=NEW VDouble(pool(), ~(int)operand->get_double());
1.55 paf 400: PUSH(value);
401: break;
402: }
403: case OP_NOT:
404: {
405: Value *operand=POP();
1.78 paf 406: Value *value=NEW VBool(pool(), !operand->get_bool());
1.55 paf 407: PUSH(value);
408: break;
409: }
1.62 paf 410: case OP_DEF:
411: {
412: Value *operand=POP();
1.78 paf 413: Value *value=NEW VBool(pool(), operand->get_defined());
1.62 paf 414: PUSH(value);
415: break;
416: }
417: case OP_IN:
418: {
419: Value *operand=POP();
1.110 paf 420: const char *path=operand->as_string().cstr();
1.112 paf 421: Value *value=NEW VBool(pool(), strcmp(path, info.uri)<=0);
1.62 paf 422: PUSH(value);
423: break;
424: }
425: case OP_FEXISTS:
426: {
427: Value *operand=POP();
1.78 paf 428: Value *value=NEW VBool(pool(), true/*TODO*/);
1.62 paf 429: PUSH(value);
430: break;
431: }
1.55 paf 432:
433: // expression ops: binary
434: case OP_SUB:
1.53 paf 435: {
1.61 paf 436: Value *b=POP(); Value *a=POP();
1.80 paf 437: Value *value=NEW VDouble(pool(), a->get_double() - b->get_double());
1.53 paf 438: PUSH(value);
439: break;
440: }
1.55 paf 441: case OP_ADD:
1.53 paf 442: {
1.61 paf 443: Value *b=POP(); Value *a=POP();
1.80 paf 444: Value *value=NEW VDouble(pool(), a->get_double() + b->get_double());
1.53 paf 445: PUSH(value);
446: break;
447: }
1.49 paf 448: case OP_MUL:
449: {
1.61 paf 450: Value *b=POP(); Value *a=POP();
1.80 paf 451: Value *value=NEW VDouble(pool(), a->get_double() * b->get_double());
1.53 paf 452: PUSH(value);
453: break;
454: }
455: case OP_DIV:
456: {
1.61 paf 457: Value *b=POP(); Value *a=POP();
1.80 paf 458: Value *value=NEW VDouble(pool(), a->get_double() / b->get_double());
1.54 paf 459: PUSH(value);
460: break;
461: }
1.55 paf 462: case OP_MOD:
463: {
1.61 paf 464: Value *b=POP(); Value *a=POP();
1.78 paf 465: Value *value=NEW VDouble(pool(),
1.97 paf 466: (int)a->get_double() %
467: (int)b->get_double());
1.55 paf 468: PUSH(value);
469: break;
470: }
471: case OP_BIN_AND:
1.54 paf 472: {
1.61 paf 473: Value *b=POP(); Value *a=POP();
1.78 paf 474: Value *value=NEW VDouble(pool(),
1.97 paf 475: (int)a->get_double() &
476: (int)b->get_double());
1.54 paf 477: PUSH(value);
478: break;
479: }
1.55 paf 480: case OP_BIN_OR:
1.54 paf 481: {
1.61 paf 482: Value *b=POP(); Value *a=POP();
1.78 paf 483: Value *value=NEW VDouble(pool(),
1.97 paf 484: (int)a->get_double() |
485: (int)b->get_double());
1.55 paf 486: PUSH(value);
487: break;
488: }
1.56 paf 489: case OP_BIN_XOR:
490: {
1.61 paf 491: Value *b=POP(); Value *a=POP();
1.78 paf 492: Value *value=NEW VDouble(pool(),
1.97 paf 493: (int)a->get_double() ^
494: (int)b->get_double());
1.56 paf 495: PUSH(value);
496: break;
497: }
1.55 paf 498: case OP_LOG_AND:
499: {
1.61 paf 500: Value *b=POP(); Value *a=POP();
1.78 paf 501: Value *value=NEW VBool(pool(), a->get_bool() && b->get_bool());
1.55 paf 502: PUSH(value);
503: break;
504: }
505: case OP_LOG_OR:
506: {
1.61 paf 507: Value *b=POP(); Value *a=POP();
1.78 paf 508: Value *value=NEW VBool(pool(), a->get_bool() || b->get_bool());
1.56 paf 509: PUSH(value);
510: break;
511: }
512: case OP_LOG_XOR:
513: {
1.61 paf 514: Value *b=POP(); Value *a=POP();
1.78 paf 515: Value *value=NEW VBool(pool(), a->get_bool() ^ b->get_bool());
1.55 paf 516: PUSH(value);
517: break;
518: }
519: case OP_NUM_LT:
520: {
1.61 paf 521: Value *b=POP(); Value *a=POP();
1.78 paf 522: Value *value=NEW VBool(pool(), a->get_double() < b->get_double());
1.55 paf 523: PUSH(value);
524: break;
525: }
526: case OP_NUM_GT:
527: {
1.61 paf 528: Value *b=POP(); Value *a=POP();
1.78 paf 529: Value *value=NEW VBool(pool(), a->get_double() > b->get_double());
1.55 paf 530: PUSH(value);
531: break;
532: }
533: case OP_NUM_LE:
534: {
1.61 paf 535: Value *b=POP(); Value *a=POP();
1.78 paf 536: Value *value=NEW VBool(pool(), a->get_double() <= b->get_double());
1.55 paf 537: PUSH(value);
538: break;
539: }
540: case OP_NUM_GE:
541: {
1.61 paf 542: Value *b=POP(); Value *a=POP();
1.78 paf 543: Value *value=NEW VBool(pool(), a->get_double() >= b->get_double());
1.55 paf 544: PUSH(value);
545: break;
546: }
547: case OP_NUM_EQ:
548: {
1.61 paf 549: Value *b=POP(); Value *a=POP();
1.78 paf 550: Value *value=NEW VBool(pool(), a->get_double() == b->get_double());
1.55 paf 551: PUSH(value);
552: break;
553: }
554: case OP_NUM_NE:
555: {
1.61 paf 556: Value *b=POP(); Value *a=POP();
1.78 paf 557: Value *value=NEW VBool(pool(), a->get_double() != b->get_double());
1.54 paf 558: PUSH(value);
559: break;
560: }
1.58 paf 561: case OP_STR_LT:
562: {
1.61 paf 563: Value *b=POP(); Value *a=POP();
1.78 paf 564: Value *value=NEW VBool(pool(), a->as_string() < b->as_string());
1.58 paf 565: PUSH(value);
566: break;
567: }
568: case OP_STR_GT:
569: {
1.61 paf 570: Value *b=POP(); Value *a=POP();
1.78 paf 571: Value *value=NEW VBool(pool(), a->as_string() > b->as_string());
1.58 paf 572: PUSH(value);
573: break;
574: }
1.55 paf 575: case OP_STR_LE:
1.58 paf 576: {
1.61 paf 577: Value *b=POP(); Value *a=POP();
1.78 paf 578: Value *value=NEW VBool(pool(), a->as_string() <= b->as_string());
1.58 paf 579: PUSH(value);
580: break;
581: }
1.55 paf 582: case OP_STR_GE:
1.54 paf 583: {
1.61 paf 584: Value *b=POP(); Value *a=POP();
1.78 paf 585: Value *value=NEW VBool(pool(), a->as_string() >= b->as_string());
1.58 paf 586: PUSH(value);
587: break;
588: }
589: case OP_STR_EQ:
590: {
1.61 paf 591: Value *b=POP(); Value *a=POP();
1.78 paf 592: Value *value=NEW VBool(pool(), a->as_string() == b->as_string());
1.58 paf 593: PUSH(value);
594: break;
595: }
596: case OP_STR_NE:
597: {
1.61 paf 598: Value *b=POP(); Value *a=POP();
1.78 paf 599: Value *value=NEW VBool(pool(), a->as_string() != b->as_string());
1.103 paf 600: PUSH(value);
601: break;
602: }
603: case OP_IS:
604: {
605: Value *b=POP(); Value *a=POP();
606: Value *value=NEW VBool(pool(), b->as_string() == a->type());
1.49 paf 607: PUSH(value);
1.28 paf 608: break;
609: }
610:
1.11 paf 611: default:
1.67 paf 612: THROW(0,0,
613: 0,
614: "unhandled '%s' opcode", opcode_name[op.code]);
1.11 paf 615: }
1.105 paf 616: log_printf("\n");
1.11 paf 617: }
1.1 paf 618: }
1.17 paf 619:
620: Value *Request::get_element() {
1.82 paf 621: const String& name=POP_NAME();
1.24 paf 622: Value *ncontext=POP();
1.32 paf 623: Value *value=ncontext->get_element(name);
1.21 paf 624:
1.76 paf 625: if(value)
1.92 paf 626: value=&process(*value, &name); // process possible code-junction
1.76 paf 627: else {
628: value=NEW VUnknown(pool());
629: value->set_name(name);
630: }
1.63 paf 631:
1.17 paf 632: return value;
1.34 paf 633: }
1.70 paf 634:
1.92 paf 635: Value& Request::process(Value& value, const String *name, bool intercept_string) {
1.90 paf 636: // intercept_string:
637: // true:
638: // they want result=string value,
639: // possible object result goes to wcontext
640: // false:
641: // they want any result[string|object]
642: // nothing goes to wcontext.
643: // used in (expression) params evaluation
644:
1.91 paf 645: Value *result;
1.70 paf 646: Junction *junction=value.get_junction();
647: if(junction && junction->code) { // is it a code-junction?
1.92 paf 648: // process it
1.105 paf 649: log_printf("ja->\n");
1.70 paf 650: PUSH(self);
651: PUSH(root);
652: PUSH(rcontext);
653: PUSH(wcontext);
654:
1.71 paf 655: WContext *frame;
1.109 paf 656: // for expression method params
657: // wcontext is set 0
658: // using the fact in decision "which wwrapper to use"
659: bool using_code_frame=intercept_string && junction->wcontext;
660: if(using_code_frame) {
1.71 paf 661: // almost plain wwrapper about junction wcontext,
662: // BUT intercepts string writes
663: frame=NEW VCodeFrame(pool(), *junction->wcontext);
664: } else {
665: // plain wwrapper
1.108 paf 666: frame=NEW WWrapper(pool(), 0/*empty*/, false/*not constructing*/);
1.71 paf 667: }
668:
669: wcontext=frame;
1.70 paf 670: self=&junction->self;
671: root=junction->root;
672: rcontext=junction->rcontext;
673: execute(*junction->code);
1.109 paf 674: if(using_code_frame) {
1.71 paf 675: // CodeFrame soul:
676: // string writes were intercepted
677: // returning them as the result of getting code-junction
678: result=NEW VString(*frame->get_string());
679: } else
680: result=frame->result();
1.70 paf 681:
682: wcontext=static_cast<WContext *>(POP());
683: rcontext=POP();
684: root=POP();
685: self=static_cast<VAliased *>(POP());
686:
1.105 paf 687: log_printf("<-ja returned");
1.70 paf 688: } else
1.91 paf 689: result=&value;
690:
691: if(name)
692: result->set_name(*name);
693: return *result;
1.85 paf 694: }
695:
1.99 paf 696: char *Request::execute_method(Value& aself, const Method& method, bool return_cstr) {
697: PUSH(self);
698: PUSH(root);
699: PUSH(rcontext);
700: PUSH(wcontext);
701:
702: // initialize contexts
703: root=rcontext=self=&aself;
704: wcontext=NEW WWrapper(pool(), &aself, false /* not constructing */);
705:
706: // execute!
707: execute(*method.parser_code);
708:
709: // result
710: char *result;
711: if(return_cstr)
712: result=wcontext->get_string()->cstr(); // chars
713: else
714: result=0; // ignore result
715:
716: wcontext=static_cast<WContext *>(POP());
717: rcontext=POP();
718: root=POP();
719: self=static_cast<VAliased *>(POP());
720:
721: // return
722: return result;
723: }
724:
725: char *Request::execute_method(Value& aself,
726: const String& method_name, bool return_cstr) {
727: if(Value *value=aself.get_element(method_name))
728: if(Junction *junction=value->get_junction())
729: if(const Method *method=junction->method)
730: return execute_method(aself, *method, return_cstr);
731:
1.85 paf 732: return 0;
1.70 paf 733: }