src/qml/qml/v4/qv4compiler.cpp

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  41
  42 #include "qv4compiler_p.h"
  43 #include "qv4compiler_p_p.h"
  44 #include "qv4program_p.h"
  45 #include "qv4ir_p.h"
  46 #include "qv4irbuilder_p.h"
  47
  48 #include <private/qqmlglobal_p.h>
  49 #include <private/qqmljsast_p.h>
  50 #include <private/qqmlaccessors_p.h>
  51 #include <private/qqmljsengine_p.h>
  52
  53 QT_BEGIN_NAMESPACE
  54
  55 DEFINE_BOOL_CONFIG_OPTION(bindingsDump, QML_BINDINGS_DUMP)
  56 DEFINE_BOOL_CONFIG_OPTION(qmlDisableOptimizer, QML_DISABLE_OPTIMIZER)
  57 DEFINE_BOOL_CONFIG_OPTION(qmlExperimental, QML_EXPERIMENTAL)
  58 DEFINE_BOOL_CONFIG_OPTION(qmlVerboseCompiler, QML_VERBOSE_COMPILER)
  59 DEFINE_BOOL_CONFIG_OPTION(qmlBindingsTestEnv, QML_BINDINGS_TEST)
  60
  61 static bool qmlBindingsTest = false;
  62 static bool qmlEnableV4 = true;
  63
  64 using namespace QQmlJS;
  65 QV4CompilerPrivate::QV4CompilerPrivate()
  66     : _function(0) , _block(0) , _discarded(false), registerCount(0)
  67 {
  68 }
  69
  70 //
  71 // tracing
  72 //
  73 void QV4CompilerPrivate::trace(int line, int column)
  74 {
  75     bytecode.clear();
  76
  77     this->currentReg = _function->tempCount;
  78     this->registerCount = qMax(this->registerCount, this->currentReg);
  79
  80     foreach (IR::BasicBlock *bb, _function->basicBlocks) {
  81         if (! bb->isTerminated() && (bb->index + 1) < _function->basicBlocks.size())
  82             bb->JUMP(_function->basicBlocks.at(bb->index + 1));
  83     }
  84
  85     QVector<IR::BasicBlock *> blocks;
  86     trace(&blocks);
  87     currentBlockMask = 0x00000001;
  88
  89
  90     for (int i = 0; !_discarded && i < blocks.size(); ++i) {
  91         IR::BasicBlock *block = blocks.at(i);
  92         IR::BasicBlock *next = i + 1 < blocks.size() ? blocks.at(i + 1) : 0;
  93         if (IR::Stmt *terminator = block->terminator()) {
  94             if (IR::CJump *cj = terminator->asCJump()) {
  95                 if (cj->iffalse != next) {
  96                     IR::Jump *jump = _function->pool->New<IR::Jump>();
  97                     jump->init(cj->iffalse);
  98                     block->statements.append(jump);
  99                 }
 100             } else if (IR::Jump *j = terminator->asJump()) {
 101                 if (j->target == next) {
 102                     block->statements.resize(block->statements.size() - 1);
 103                 }
 104             }
 105         }
 106
 107         block->offset = bytecode.size();
 108
 109         if (bytecode.isEmpty()) {
 110             if (qmlBindingsTest || bindingsDump()) {
 111                 Instr::BindingId id;
 112                 id.column = column;
 113                 id.line = line;
 114                 gen(id);
 115             }
 116
 117             if (qmlBindingsTest) {
 118                 QString str = expression->expression.asScript();
 119                 QByteArray strdata((const char *)str.constData(), str.length() * sizeof(QChar));
 120                 int offset = data.count();
 121                 data += strdata;
 122
 123                 Instr::EnableV4Test test;
 124                 test.reg = 0;
 125                 test.offset = offset;
 126                 test.length = str.length();
 127                 gen(test);
 128             }
 129         }
 130
 131         bool usic = false;
 132         int patchesCount = patches.count();
 133         qSwap(usedSubscriptionIdsChanged, usic);
 134
 135         int blockopIndex = bytecode.size();
 136         Instr::Block blockop;
 137         blockop.block = currentBlockMask;
 138         gen(blockop);
 139
 140         foreach (IR::Stmt *s, block->statements) {
 141             if (! _discarded)
 142                 s->accept(this);
 143         }
 144
 145         qSwap(usedSubscriptionIdsChanged, usic);
 146
 147         if (usic) {
 148             if (currentBlockMask == 0x80000000) {
 149                 discard();
 150                 return;
 151             }
 152             currentBlockMask <<= 1;
 153         } else if (! _discarded) {
 154             const int adjust = bytecode.remove(blockopIndex);
 155             // Correct patches
 156             for (int ii = patchesCount; ii < patches.count(); ++ii)
 157                 patches[ii].offset -= adjust;
 158         }
 159     }
 160
 161 #ifdef DEBUG_IR_STRUCTURE
 162     IR::IRDump dump;
 163     for (int i = 0; i < blocks.size(); ++i) {
 164         dump.basicblock(blocks.at(i));
 165     }
 166 #endif
 167
 168
 169     if (! _discarded) {
 170         // back patching
 171         foreach (const Patch &patch, patches) {
 172             V4Instr &instr = bytecode[patch.offset];
 173             int size = V4Instr::size(instructionType(&instr));
 174             instr.branchop.offset = patch.block->offset - patch.offset - size;
 175         }
 176
 177         patches.clear();
 178     }
 179 }
 180
 181 void QV4CompilerPrivate::trace(QVector<IR::BasicBlock *> *blocks)
 182 {
 183     for (int i = 0; i < _function->basicBlocks.size(); ++i) {
 184         IR::BasicBlock *block = _function->basicBlocks.at(i);
 185
 186         while (! blocks->contains(block)) {
 187             blocks->append(block);
 188
 189             if (IR::Stmt *terminator = block->terminator()) {
 190                 if (IR::CJump *cj = terminator->asCJump())
 191                     block = cj->iffalse;
 192                 else if (IR::Jump *j = terminator->asJump())
 193                     block = j->target;
 194             }
 195         }
 196     }
 197 }
 198
 199 void QV4CompilerPrivate::traceExpression(IR::Expr *e, quint8 r)
 200 {
 201     if (!e) {
 202         discard();
 203     } else {
 204         qSwap(currentReg, r);
 205         e->accept(this);
 206         qSwap(currentReg, r);
 207     }
 208 }
 209
 210 //
 211 // expressions
 212 //
 213 void QV4CompilerPrivate::visitConst(IR::Const *e)
 214 {
 215     switch (e->type) {
 216     case IR::BoolType: {
 217         Instr::LoadBool i;
 218         i.reg = currentReg;
 219         i.value = e->value;
 220         gen(i);
 221         } break;
 222
 223     case IR::IntType: {
 224         Instr::LoadInt i;
 225         i.reg = currentReg;
 226         i.value = e->value;
 227         gen(i);
 228         } break;
 229
 230     case IR::RealType: {
 231         Instr::LoadReal i;
 232         i.reg = currentReg;
 233         i.value = e->value;
 234         gen(i);
 235         } break;
 236
 237     default:
 238         if (qmlVerboseCompiler())
 239             qWarning() << Q_FUNC_INFO << "unexpected type";
 240         discard();
 241     }
 242 }
 243
 244 void QV4CompilerPrivate::visitString(IR::String *e)
 245 {
 246     registerLiteralString(currentReg, e->value);
 247 }
 248
 249 void QV4CompilerPrivate::visitName(IR::Name *e)
 250 {
 251     if (e->base) {
 252         // fetch the object and store it in reg.
 253         traceExpression(e->base, currentReg);
 254     } else {
 255         _subscribeName.clear();
 256     }
 257
 258     if (e->storage == IR::Name::RootStorage) {
 259
 260         Instr::LoadRoot instr;
 261         instr.reg = currentReg;
 262         gen(instr);
 263
 264         if (e->symbol == IR::Name::IdObject) {
 265             // The ID is a reference to the root object
 266             return;
 267         }
 268
 269     } else if (e->storage == IR::Name::ScopeStorage) {
 270
 271         Instr::LoadScope instr;
 272         instr.reg = currentReg;
 273         gen(instr);
 274
 275         _subscribeName << contextName();
 276
 277     } else if (e->storage == IR::Name::IdStorage) {
 278
 279         Instr::LoadId instr;
 280         instr.reg = currentReg;
 281         instr.index = e->idObject->idIndex;
 282         gen(instr);
 283
 284         _subscribeName << QLatin1String("$$$ID_") + *e->id;
 285
 286         if (blockNeedsSubscription(_subscribeName)) {
 287             Instr::SubscribeId sub;
 288             sub.reg = currentReg;
 289             sub.offset = subscriptionIndex(_subscribeName);
 290             sub.index = instr.index;
 291             gen(sub);
 292         }
 293
 294         return;
 295     } else {
 296         // No action needed
 297     }
 298
 299     switch (e->symbol) {
 300     case IR::Name::Unbound:
 301     case IR::Name::IdObject:
 302     case IR::Name::Slot:
 303     case IR::Name::Object: {
 304         Q_ASSERT(!"Unreachable");
 305         discard();
 306     } break;
 307
 308     case IR::Name::AttachType: {
 309         _subscribeName << *e->id;
 310
 311         Instr::LoadAttached attached;
 312         attached.output = currentReg;
 313         attached.reg = currentReg;
 314         attached.exceptionId = exceptionId(e->line, e->column);
 315         if (e->declarativeType->attachedPropertiesId() == -1)
 316             discard();
 317         attached.id = e->declarativeType->attachedPropertiesId();
 318         gen(attached);
 319     } break;
 320
 321     case IR::Name::Property: {
 322         _subscribeName << *e->id;
 323
 324         if (e->property->coreIndex == -1) {
 325             QMetaProperty prop;
 326             e->property->load(prop, QQmlEnginePrivate::get(engine));
 327         }
 328
 329         const int propTy = e->property->propType;
 330         QQmlRegisterType regType;
 331
 332         switch (propTy) {
 333         case QMetaType::QReal:
 334             regType = QRealType;
 335             break;
 336         case QMetaType::Bool:
 337             regType = BoolType;
 338             break;
 339         case QMetaType::Int:
 340             regType = IntType;
 341             break;
 342         case QMetaType::QString:
 343             regType = QStringType;
 344             break;
 345         case QMetaType::QUrl:
 346             regType = QUrlType;
 347             break;
 348         case QMetaType::QColor:
 349             regType = QColorType;
 350             break;
 351
 352         default:
 353             if (propTy == QQmlMetaType::QQuickAnchorLineMetaTypeId()) {
 354                 regType = PODValueType;
 355             } else if (QQmlMetaType::isQObject(propTy)) {
 356                 regType = QObjectStarType;
 357             } else {
 358                 if (qmlVerboseCompiler())
 359                     qWarning() << "Discard unsupported property type:" << QMetaType::typeName(propTy);
 360                 discard(); // Unsupported type
 361                 return;
 362             }
 363
 364             break;
 365         } // switch
 366
 367         if (e->property->hasAccessors()) {
 368             Instr::FetchAndSubscribe fetch;
 369             fetch.reg = currentReg;
 370             fetch.subscription = subscriptionIndex(_subscribeName);
 371             fetch.exceptionId = exceptionId(e->line, e->column);
 372             fetch.valueType = regType;
 373             fetch.property = *e->property;
 374             gen(fetch);
 375         } else {
 376             if (blockNeedsSubscription(_subscribeName) && e->property->notifyIndex != -1) {
 377                 Instr::Subscribe sub;
 378                 sub.reg = currentReg;
 379                 sub.offset = subscriptionIndex(_subscribeName);
 380                 sub.index = e->property->notifyIndex;
 381                 gen(sub);
 382             }
 383
 384             Instr::Fetch fetch;
 385             fetch.reg = currentReg;
 386             fetch.index = e->property->coreIndex;
 387             fetch.exceptionId = exceptionId(e->line, e->column);
 388             fetch.valueType = regType;
 389             gen(fetch);
 390         }
 391
 392     } break;
 393     } // switch
 394 }
 395
 396 void QV4CompilerPrivate::visitTemp(IR::Temp *e)
 397 {
 398     if (currentReg != e->index) {
 399         Instr::Copy i;
 400         i.reg = currentReg;
 401         i.src = e->index;
 402         gen(i);
 403     }
 404 }
 405
 406 void QV4CompilerPrivate::visitUnop(IR::Unop *e)
 407 {
 408     quint8 src = currentReg;
 409
 410     if (IR::Temp *temp = e->expr->asTemp()) {
 411         src = temp->index;
 412     } else {
 413         traceExpression(e->expr, src);
 414     }
 415
 416     switch (e->op) {
 417     case IR::OpInvalid:
 418         Q_ASSERT(!"unreachable");
 419         break;
 420
 421     case IR::OpIfTrue:
 422         convertToBool(e->expr, src);
 423         if (src != currentReg) {
 424             Instr::Copy i;
 425             i.reg = currentReg;
 426             i.src = src;
 427             gen(i);
 428         }
 429         break;
 430
 431     case IR::OpNot: {
 432         Instr::UnaryNot i;
 433         convertToBool(e->expr, src);
 434         i.output = currentReg;
 435         i.src = src;
 436         gen(i);
 437         } break;
 438
 439     case IR::OpUMinus:
 440         if (e->expr->type == IR::RealType) {
 441             Instr::UnaryMinusReal i;
 442             i.output = currentReg;
 443             i.src = src;
 444             gen(i);
 445         } else if (e->expr->type == IR::IntType) {
 446             convertToReal(e->expr, currentReg);
 447             Instr::UnaryMinusReal i;
 448             i.output = currentReg;
 449             i.src = src;
 450             gen(i);
 451         } else {
 452             discard();
 453         }
 454         break;
 455
 456     case IR::OpUPlus:
 457         if (e->expr->type == IR::RealType) {
 458             Instr::UnaryPlusReal i;
 459             i.output = currentReg;
 460             i.src = src;
 461             gen(i);
 462         } else if (e->expr->type == IR::IntType) {
 463             convertToReal(e->expr, currentReg);
 464             Instr::UnaryPlusReal i;
 465             i.output = currentReg;
 466             i.src = src;
 467             gen(i);
 468         } else {
 469             discard();
 470         }
 471         break;
 472
 473     case IR::OpCompl:
 474         // TODO
 475         discard();
 476         break;
 477
 478     case IR::OpBitAnd:
 479     case IR::OpBitOr:
 480     case IR::OpBitXor:
 481     case IR::OpAdd:
 482     case IR::OpSub:
 483     case IR::OpMul:
 484     case IR::OpDiv:
 485     case IR::OpMod:
 486     case IR::OpLShift:
 487     case IR::OpRShift:
 488     case IR::OpURShift:
 489     case IR::OpGt:
 490     case IR::OpLt:
 491     case IR::OpGe:
 492     case IR::OpLe:
 493     case IR::OpEqual:
 494     case IR::OpNotEqual:
 495     case IR::OpStrictEqual:
 496     case IR::OpStrictNotEqual:
 497     case IR::OpAnd:
 498     case IR::OpOr:
 499         Q_ASSERT(!"unreachable");
 500         break;
 501     } // switch
 502 }
 503
 504 void QV4CompilerPrivate::convertToReal(IR::Expr *expr, int reg)
 505 {
 506     if (expr->type == IR::RealType)
 507         return;
 508
 509     switch (expr->type) {
 510     case IR::BoolType: {
 511         Instr::ConvertBoolToReal i;
 512         i.output = i.src = reg;
 513         gen(i);
 514         } break;
 515
 516     case IR::IntType: {
 517         Instr::ConvertIntToReal i;
 518         i.output = i.src = reg;
 519         gen(i);
 520         } break;
 521
 522     case IR::RealType:
 523         // nothing to do
 524         return;
 525
 526     default:
 527         discard();
 528         break;
 529     } // switch
 530 }
 531
 532 void QV4CompilerPrivate::convertToInt(IR::Expr *expr, int reg)
 533 {
 534     if (expr->type == IR::IntType)
 535         return;
 536
 537     switch (expr->type) {
 538     case IR::BoolType: {
 539         Instr::ConvertBoolToInt i;
 540         i.output = i.src = reg;
 541         gen(i);
 542         } break;
 543
 544     case IR::IntType:
 545         // nothing to do
 546         return;
 547
 548     case IR::RealType: {
 549         Instr::ConvertRealToInt i;
 550         i.output = i.src = reg;
 551         gen(i);
 552         } break;
 553
 554     default:
 555         discard();
 556         break;
 557     } // switch
 558 }
 559
 560 void QV4CompilerPrivate::convertToBool(IR::Expr *expr, int reg)
 561 {
 562     if (expr->type == IR::BoolType)
 563         return;
 564
 565     switch (expr->type) {
 566     case IR::BoolType:
 567         // nothing to do
 568         break;
 569
 570     case IR::IntType: {
 571         Instr::ConvertIntToBool i;
 572         i.output = i.src = reg;
 573         gen(i);
 574         } break;
 575
 576     case IR::RealType: {
 577         Instr::ConvertRealToBool i;
 578         i.output = i.src = reg;
 579         gen(i);
 580         } return;
 581
 582     case IR::StringType: {
 583         Instr::ConvertStringToBool i;
 584         i.output = i.src = reg;
 585         gen(i);
 586         } return;
 587
 588     case IR::ColorType: {
 589         Instr::ConvertColorToBool i;
 590         i.output = i.src = reg;
 591         gen(i);
 592         } return;
 593
 594     default:
 595         discard();
 596         break;
 597     } // switch
 598 }
 599
 600 quint8 QV4CompilerPrivate::instructionOpcode(IR::Binop *e)
 601 {
 602     switch (e->op) {
 603     case IR::OpInvalid:
 604         return V4Instr::Noop;
 605
 606     case IR::OpIfTrue:
 607     case IR::OpNot:
 608     case IR::OpUMinus:
 609     case IR::OpUPlus:
 610     case IR::OpCompl:
 611         return V4Instr::Noop;
 612
 613     case IR::OpBitAnd:
 614         return V4Instr::BitAndInt;
 615
 616     case IR::OpBitOr:
 617         return V4Instr::BitOrInt;
 618
 619     case IR::OpBitXor:
 620         return V4Instr::BitXorInt;
 621
 622     case IR::OpAdd:
 623         if (e->type == IR::StringType)
 624             return V4Instr::AddString;
 625         return V4Instr::AddReal;
 626
 627     case IR::OpSub:
 628         return V4Instr::SubReal;
 629
 630     case IR::OpMul:
 631         return V4Instr::MulReal;
 632
 633     case IR::OpDiv:
 634         return V4Instr::DivReal;
 635
 636     case IR::OpMod:
 637         return V4Instr::ModReal;
 638
 639     case IR::OpLShift:
 640         return V4Instr::LShiftInt;
 641
 642     case IR::OpRShift:
 643         return V4Instr::RShiftInt;
 644
 645     case IR::OpURShift:
 646         return V4Instr::URShiftInt;
 647
 648     case IR::OpGt:
 649         if (e->left->type == IR::StringType)
 650             return V4Instr::GtString;
 651         return V4Instr::GtReal;
 652
 653     case IR::OpLt:
 654         if (e->left->type == IR::StringType)
 655             return V4Instr::LtString;
 656         return V4Instr::LtReal;
 657
 658     case IR::OpGe:
 659         if (e->left->type == IR::StringType)
 660             return V4Instr::GeString;
 661         return V4Instr::GeReal;
 662
 663     case IR::OpLe:
 664         if (e->left->type == IR::StringType)
 665             return V4Instr::LeString;
 666         return V4Instr::LeReal;
 667
 668     case IR::OpEqual:
 669         if (e->left->type == IR::StringType)
 670             return V4Instr::EqualString;
 671         return V4Instr::EqualReal;
 672
 673     case IR::OpNotEqual:
 674         if (e->left->type == IR::StringType)
 675             return V4Instr::NotEqualString;
 676         return V4Instr::NotEqualReal;
 677
 678     case IR::OpStrictEqual:
 679         if (e->left->type == IR::StringType)
 680             return V4Instr::StrictEqualString;
 681         return V4Instr::StrictEqualReal;
 682
 683     case IR::OpStrictNotEqual:
 684         if (e->left->type == IR::StringType)
 685             return V4Instr::StrictNotEqualString;
 686         return V4Instr::StrictNotEqualReal;
 687
 688     case IR::OpAnd:
 689     case IR::OpOr:
 690         return V4Instr::Noop;
 691
 692     } // switch
 693
 694     return V4Instr::Noop;
 695 }
 696
 697 void QV4CompilerPrivate::visitBinop(IR::Binop *e)
 698 {
 699     if (e->type == IR::InvalidType) {
 700         discard();
 701         return;
 702     }
 703
 704     int left = currentReg;
 705     int right = currentReg + 1;
 706
 707     traceExpression(e->left, left);
 708     traceExpression(e->right, right);
 709
 710     // At this point it is possible that the type of the
 711     // subexpressions is different. This can happen because
 712     // we keep BINOP expressions in HIR.
 713
 714     switch (e->op) {
 715     case IR::OpInvalid:
 716         discard();
 717         break;
 718
 719     // unary
 720     case IR::OpIfTrue:
 721     case IR::OpNot:
 722     case IR::OpUMinus:
 723     case IR::OpUPlus:
 724     case IR::OpCompl:
 725         discard();
 726         break;
 727
 728     case IR::OpBitAnd:
 729     case IR::OpBitOr:
 730     case IR::OpBitXor:
 731     case IR::OpLShift:
 732     case IR::OpRShift:
 733     case IR::OpURShift:
 734         convertToInt(e->left, left);
 735         convertToInt(e->right, right);
 736         break;
 737
 738     case IR::OpAdd:
 739         if (e->type != IR::StringType) {
 740             convertToReal(e->left, left);
 741             convertToReal(e->right, right);
 742         }
 743         break;
 744
 745     case IR::OpSub:
 746     case IR::OpMul:
 747     case IR::OpDiv:
 748     case IR::OpMod:
 749         convertToReal(e->left, left);
 750         convertToReal(e->right, right);
 751         break;
 752
 753     case IR::OpGt:
 754     case IR::OpLt:
 755     case IR::OpGe:
 756     case IR::OpLe:
 757     case IR::OpEqual:
 758     case IR::OpNotEqual:
 759     case IR::OpStrictEqual:
 760     case IR::OpStrictNotEqual:
 761         if (e->left->type != IR::StringType) {
 762             convertToReal(e->left, left);
 763             convertToReal(e->right, right);
 764         }
 765         break;
 766
 767     case IR::OpAnd:
 768     case IR::OpOr:
 769         discard(); // ### unreachable
 770         break;
 771     } // switch
 772
 773     const quint8 opcode = instructionOpcode(e);
 774     if (opcode != V4Instr::Noop) {
 775         V4Instr instr;
 776         instr.binaryop.output = currentReg;
 777         instr.binaryop.left = left;
 778         instr.binaryop.right = right;
 779         gen(static_cast<V4Instr::Type>(opcode), instr);
 780     }
 781 }
 782
 783 void QV4CompilerPrivate::visitCall(IR::Call *call)
 784 {
 785     if (IR::Name *name = call->base->asName()) {
 786         IR::Expr *arg = call->onlyArgument();
 787         if (arg != 0 && arg->type == IR::RealType) {
 788             traceExpression(arg, currentReg);
 789
 790             switch (name->builtin) {
 791             case IR::NoBuiltinSymbol:
 792                 break;
 793
 794             case IR::MathSinBultinFunction: {
 795                 Instr::MathSinReal i;
 796                 i.output = i.src = currentReg;
 797                 gen(i);
 798                 } return;
 799
 800             case IR::MathCosBultinFunction: {
 801                 Instr::MathCosReal i;
 802                 i.output = i.src = currentReg;
 803                 gen(i);
 804                 } return;
 805
 806             case IR::MathRoundBultinFunction: {
 807                 Instr::MathRoundReal i;
 808                 i.output = i.src = currentReg;
 809                 gen(i);
 810                 } return;
 811
 812             case IR::MathFloorBultinFunction: {
 813                 Instr::MathFloorReal i;
 814                 i.output = i.src = currentReg;
 815                 gen(i);
 816                 } return;
 817
 818             case IR::MathPIBuiltinConstant:
 819                 break;
 820             } // switch
 821         }
 822     }
 823
 824     if (qmlVerboseCompiler())
 825         qWarning() << "TODO:" << Q_FUNC_INFO << __LINE__;
 826     discard();
 827 }
 828
 829
 830 //
 831 // statements
 832 //
 833 void QV4CompilerPrivate::visitExp(IR::Exp *s)
 834 {
 835     traceExpression(s->expr, currentReg);
 836 }
 837
 838 void QV4CompilerPrivate::visitMove(IR::Move *s)
 839 {
 840     IR::Temp *target = s->target->asTemp();
 841     Q_ASSERT(target != 0);
 842
 843     quint8 dest = target->index;
 844
 845     if (target->type != s->source->type) {
 846         quint8 src = dest;
 847
 848         if (IR::Temp *t = s->source->asTemp())
 849             src = t->index;
 850         else
 851             traceExpression(s->source, dest);
 852
 853         V4Instr::Type opcode = V4Instr::Noop;
 854         IR::Type targetTy = s->target->type;
 855         IR::Type sourceTy = s->source->type;
 856
 857         if (sourceTy == IR::UrlType) {
 858             switch (targetTy) {
 859             case IR::BoolType:
 860             case IR::StringType:
 861                 // nothing to do. V4 will generate optimized
 862                 // url-to-xxx conversions.
 863                 break;
 864             default: {
 865                 // generate a UrlToString conversion and fix
 866                 // the type of the source expression.
 867                 V4Instr conv;
 868                 conv.unaryop.output = V4Instr::ConvertUrlToString;
 869                 conv.unaryop.src = src;
 870                 gen(opcode, conv);
 871
 872                 sourceTy = IR::StringType;
 873                 break;
 874             }
 875             } // switch
 876         }
 877
 878         if (targetTy == IR::BoolType) {
 879             switch (sourceTy) {
 880             case IR::IntType: opcode = V4Instr::ConvertIntToBool; break;
 881             case IR::RealType: opcode = V4Instr::ConvertRealToBool; break;
 882             case IR::StringType: opcode = V4Instr::ConvertStringToBool; break;
 883             case IR::UrlType: opcode = V4Instr::ConvertUrlToBool; break;
 884             case IR::ColorType: opcode = V4Instr::ConvertColorToBool; break;
 885             default: break;
 886             } // switch
 887         } else if (targetTy == IR::IntType) {
 888             switch (sourceTy) {
 889             case IR::BoolType: opcode = V4Instr::ConvertBoolToInt; break;
 890             case IR::RealType: {
 891                 if (s->isMoveForReturn)
 892                     opcode = V4Instr::MathRoundReal;
 893                 else
 894                     opcode = V4Instr::ConvertRealToInt;
 895                 break;
 896             }
 897             case IR::StringType: opcode = V4Instr::ConvertStringToInt; break;
 898             default: break;
 899             } // switch
 900         } else if (targetTy == IR::RealType) {
 901             switch (sourceTy) {
 902             case IR::BoolType: opcode = V4Instr::ConvertBoolToReal; break;
 903             case IR::IntType: opcode = V4Instr::ConvertIntToReal; break;
 904             case IR::StringType: opcode = V4Instr::ConvertStringToReal; break;
 905             default: break;
 906             } // switch
 907         } else if (targetTy == IR::StringType) {
 908             switch (sourceTy) {
 909             case IR::BoolType: opcode = V4Instr::ConvertBoolToString; break;
 910             case IR::IntType:  opcode = V4Instr::ConvertIntToString; break;
 911             case IR::RealType: opcode = V4Instr::ConvertRealToString; break;
 912             case IR::UrlType: opcode = V4Instr::ConvertUrlToString; break;
 913             case IR::ColorType: opcode = V4Instr::ConvertColorToString; break;
 914             default: break;
 915             } // switch
 916         } else if (targetTy == IR::UrlType) {
 917             V4Instr convToString;
 918             convToString.unaryop.output = dest;
 919             convToString.unaryop.src = src;
 920
 921             // try to convert the source expression to a string.
 922             switch (sourceTy) {
 923             case IR::BoolType: gen(V4Instr::ConvertBoolToString, convToString); sourceTy = IR::StringType; break;
 924             case IR::IntType:  gen(V4Instr::ConvertIntToString,  convToString); sourceTy = IR::StringType; break;
 925             case IR::RealType: gen(V4Instr::ConvertRealToString, convToString); sourceTy = IR::StringType; break;
 926             case IR::ColorType: gen(V4Instr::ConvertColorToString, convToString); sourceTy = IR::StringType; break;
 927             default: break;
 928             } // switch
 929
 930             if (sourceTy == IR::StringType)
 931                 opcode = V4Instr::ConvertStringToUrl;
 932         } else if (targetTy == IR::ColorType) {
 933             switch (sourceTy) {
 934             case IR::StringType: opcode = V4Instr::ConvertStringToColor; break;
 935             default: break;
 936             } // switch
 937         }
 938         if (opcode != V4Instr::Noop) {
 939             V4Instr conv;
 940             conv.unaryop.output = dest;
 941             conv.unaryop.src = src;
 942             gen(opcode, conv);
 943
 944             if (s->isMoveForReturn && opcode == V4Instr::ConvertStringToUrl) {
 945                 V4Instr resolveUrl;
 946                 resolveUrl.unaryop.output = dest;
 947                 resolveUrl.unaryop.src = dest;
 948                 gen(V4Instr::ResolveUrl, resolveUrl);
 949             }
 950         } else {
 951             discard();
 952         }
 953     } else {
 954         traceExpression(s->source, dest);
 955     }
 956 }
 957
 958 void QV4CompilerPrivate::visitJump(IR::Jump *s)
 959 {
 960     patches.append(Patch(s->target, bytecode.size()));
 961
 962     Instr::Branch i;
 963     i.offset = 0; // ### backpatch
 964     gen(i);
 965 }
 966
 967 void QV4CompilerPrivate::visitCJump(IR::CJump *s)
 968 {
 969     traceExpression(s->cond, currentReg);
 970
 971     patches.append(Patch(s->iftrue, bytecode.size()));
 972
 973     Instr::BranchTrue i;
 974     i.reg = currentReg;
 975     i.offset = 0; // ### backpatch
 976     gen(i);
 977 }
 978
 979 void QV4CompilerPrivate::visitRet(IR::Ret *s)
 980 {
 981     Q_ASSERT(s->expr != 0);
 982
 983     int storeReg = currentReg;
 984
 985     if (IR::Temp *temp = s->expr->asTemp()) {
 986         storeReg = temp->index;
 987     } else {
 988         traceExpression(s->expr, storeReg);
 989     }
 990
 991     if (qmlBindingsTest) {
 992         Instr::TestV4Store test;
 993         test.reg = storeReg;
 994         switch (s->type) {
 995         case IR::StringType:
 996             test.regType = QMetaType::QString;
 997             break;
 998         case IR::UrlType:
 999             test.regType = QMetaType::QUrl;
1000             break;
1001         case IR::ColorType:
1002             test.regType = QMetaType::QColor;
1003             break;
1004         case IR::SGAnchorLineType:
1005             test.regType = QQmlMetaType::QQuickAnchorLineMetaTypeId();
1006             break;
1007         case IR::ObjectType:
1008             test.regType = QMetaType::QObjectStar;
1009             break;
1010         case IR::BoolType:
1011             test.regType = QMetaType::Bool;
1012             break;
1013         case IR::IntType:
1014             test.regType = QMetaType::Int;
1015             break;
1016         case IR::RealType:
1017             test.regType = QMetaType::QReal;
1018             break;
1019         default:
1020             discard();
1021             return;
1022         }
1023         gen(test);
1024     }
1025
1026     Instr::Store store;
1027     store.output = 0;
1028     store.index = expression->property->index;
1029     store.reg = storeReg;
1030     store.exceptionId = exceptionId(s->line, s->column);
1031     gen(store);
1032 }
1033
1034 void QV4Compiler::dump(const QByteArray &programData)
1035 {
1036     const QV4Program *program = (const QV4Program *)programData.constData();
1037
1038     qWarning() << "Program.bindings:" << program->bindings;
1039     qWarning() << "Program.dataLength:" << program->dataLength;
1040     qWarning() << "Program.subscriptions:" << program->subscriptions;
1041     qWarning() << "Program.indentifiers:" << program->identifiers;
1042
1043     const int programSize = program->instructionCount;
1044     const char *start = program->instructions();
1045     const char *end = start + programSize;
1046     Bytecode bc;
1047     bc.dump(start, end);
1048 }
1049
1050 /*!
1051 Clear the state associated with attempting to compile a specific binding.
1052 This does not clear the global "committed binding" states.
1053 */
1054 void QV4CompilerPrivate::resetInstanceState()
1055 {
1056     data = committed.data;
1057     exceptions = committed.exceptions;
1058     usedSubscriptionIds.clear();
1059     subscriptionIds = committed.subscriptionIds;
1060     registeredStrings = committed.registeredStrings;
1061     bytecode.clear();
1062     patches.clear();
1063     pool.clear();
1064     currentReg = 0;
1065 }
1066
1067 /*!
1068 Mark the last compile as successful, and add it to the "committed data"
1069 section.
1070
1071 Returns the index for the committed binding.
1072 */
1073 int QV4CompilerPrivate::commitCompile()
1074 {
1075     int rv = committed.count();
1076     committed.offsets << committed.bytecode.count();
1077     committed.dependencies << usedSubscriptionIds;
1078     committed.bytecode.append(bytecode.constData(), bytecode.size());
1079     committed.data = data;
1080     committed.exceptions = exceptions;
1081     committed.subscriptionIds = subscriptionIds;
1082     committed.registeredStrings = registeredStrings;
1083     return rv;
1084 }
1085
1086 bool QV4CompilerPrivate::compile(QQmlJS::AST::Node *node)
1087 {
1088     resetInstanceState();
1089
1090     if (expression->property->type == -1)
1091         return false;
1092
1093     AST::SourceLocation location;
1094     if (AST::ExpressionNode *astExpression = node->expressionCast()) {
1095         location = astExpression->firstSourceLocation();
1096     } else if (AST::Statement *astStatement = node->statementCast()) {
1097         if (AST::Block *block = AST::cast<AST::Block *>(astStatement))
1098             location = block->lbraceToken;
1099         else if (AST::IfStatement *ifStmt = AST::cast<AST::IfStatement *>(astStatement))
1100             location = ifStmt->ifToken;
1101         else
1102             return false;
1103     } else {
1104         return false;
1105     }
1106
1107     IR::Function thisFunction(&pool), *function = &thisFunction;
1108
1109     QV4IRBuilder irBuilder(expression, engine);
1110     if (!irBuilder(function, node))
1111         return false;
1112
1113     bool discarded = false;
1114     qSwap(_discarded, discarded);
1115     qSwap(_function, function);
1116     trace(location.startLine, location.startColumn);
1117     qSwap(_function, function);
1118     qSwap(_discarded, discarded);
1119
1120     if (qmlVerboseCompiler()) {
1121         QTextStream qerr(stderr, QIODevice::WriteOnly);
1122         if (discarded)
1123             qerr << "======== TODO ====== " << endl;
1124         else
1125             qerr << "==================== " << endl;
1126         qerr << "\tline: " << location.startLine
1127              << "\tcolumn: " << location.startColumn
1128              << endl;
1129         foreach (IR::BasicBlock *bb, function->basicBlocks)
1130             bb->dump(qerr);
1131         qerr << endl;
1132     }
1133
1134     if (discarded || subscriptionIds.count() > 0xFFFF || registeredStrings.count() > 0xFFFF || registerCount > 31)
1135         return false;
1136
1137     return true;
1138 }
1139
1140 // Returns a reg
1141 int QV4CompilerPrivate::registerLiteralString(quint8 reg, const QStringRef &str)
1142 {
1143     // ### string cleanup
1144
1145     QByteArray strdata((const char *)str.constData(), str.length() * sizeof(QChar));
1146     int offset = data.count();
1147     data += strdata;
1148
1149     Instr::LoadString string;
1150     string.reg = reg;
1151     string.offset = offset;
1152     string.length = str.length();
1153     gen(string);
1154
1155     return reg;
1156 }
1157
1158 // Returns an identifier offset
1159 int QV4CompilerPrivate::registerString(const QString &string)
1160 {
1161     Q_ASSERT(!string.isEmpty());
1162
1163     QPair<int, int> *iter = registeredStrings.value(string);
1164
1165     if (!iter) {
1166         quint32 len = string.length();
1167         QByteArray lendata((const char *)&len, sizeof(quint32));
1168         QByteArray strdata((const char *)string.constData(), string.length() * sizeof(QChar));
1169         strdata.prepend(lendata);
1170         int rv = data.count();
1171         data += strdata;
1172
1173         iter = &registeredStrings[string];
1174         *iter = qMakePair(registeredStrings.count(), rv);
1175     }
1176
1177     Instr::InitString reg;
1178     reg.offset = iter->first;
1179     reg.dataIdx = iter->second;
1180     gen(reg);
1181     return reg.offset;
1182 }
1183
1184 /*!
1185 Returns true if the current expression has not already subscribed to \a sub in currentBlockMask.
1186 */
1187 bool QV4CompilerPrivate::blockNeedsSubscription(const QStringList &sub)
1188 {
1189     QString str = sub.join(QLatin1String("."));
1190
1191     int *iter = subscriptionIds.value(str);
1192     if (!iter)
1193         return true;
1194
1195     quint32 *uiter = usedSubscriptionIds.value(*iter);
1196     if (!uiter)
1197         return true;
1198     else
1199         return !(*uiter & currentBlockMask);
1200 }
1201
1202 int QV4CompilerPrivate::subscriptionIndex(const QStringList &sub)
1203 {
1204     QString str = sub.join(QLatin1String("."));
1205     int *iter = subscriptionIds.value(str);
1206     if (!iter) {
1207         int count = subscriptionIds.count();
1208         iter = &subscriptionIds[str];
1209         *iter = count;
1210     }
1211     quint32 &u = usedSubscriptionIds[*iter];
1212     if (!(u & currentBlockMask)) {
1213         u |= currentBlockMask;
1214         usedSubscriptionIdsChanged = true;
1215     }
1216     return *iter;
1217 }
1218
1219 quint32 QV4CompilerPrivate::subscriptionBlockMask(const QStringList &sub)
1220 {
1221     QString str = sub.join(QLatin1String("."));
1222
1223     int *iter = subscriptionIds.value(str);
1224     Q_ASSERT(iter != 0);
1225
1226     quint32 *uiter = usedSubscriptionIds.value(*iter);
1227     Q_ASSERT(uiter != 0);
1228
1229     return *uiter;
1230 }
1231
1232 quint8 QV4CompilerPrivate::exceptionId(quint32 line, quint32 column)
1233 {
1234     quint8 rv = 0xFF;
1235     if (exceptions.count() < 0xFF) {
1236         rv = (quint8)exceptions.count();
1237         quint64 e = line;
1238         e <<= 32;
1239         e |= column;
1240         exceptions.append(e);
1241     }
1242     return rv;
1243 }
1244
1245 quint8 QV4CompilerPrivate::exceptionId(QQmlJS::AST::ExpressionNode *n)
1246 {
1247     quint8 rv = 0xFF;
1248     if (n && exceptions.count() < 0xFF) {
1249         QQmlJS::AST::SourceLocation l = n->firstSourceLocation();
1250         rv = exceptionId(l.startLine, l.startColumn);
1251     }
1252     return rv;
1253 }
1254
1255 QV4Compiler::QV4Compiler()
1256 : d(new QV4CompilerPrivate)
1257 {
1258     qmlBindingsTest |= qmlBindingsTestEnv();
1259 }
1260
1261 QV4Compiler::~QV4Compiler()
1262 {
1263     delete d; d = 0;
1264 }
1265
1266 /*
1267 Returns true if any bindings were compiled.
1268 */
1269 bool QV4Compiler::isValid() const
1270 {
1271     return !d->committed.bytecode.isEmpty();
1272 }
1273
1274 /*
1275 -1 on failure, otherwise the binding index to use.
1276 */
1277 int QV4Compiler::compile(const Expression &expression, QQmlEnginePrivate *engine)
1278 {
1279     if (!expression.expression.asAST()) return false;
1280
1281     if (!qmlExperimental() && expression.property->isValueTypeSubProperty)
1282         return -1;
1283
1284     if (qmlDisableOptimizer() || !qmlEnableV4)
1285         return -1;
1286
1287     d->expression = &expression;
1288     d->engine = engine;
1289
1290     if (d->compile(expression.expression.asAST())) {
1291         return d->commitCompile();
1292     } else {
1293         return -1;
1294     }
1295 }
1296
1297 QByteArray QV4CompilerPrivate::buildSignalTable() const
1298 {
1299     QHash<int, QList<QPair<int, quint32> > > table;
1300
1301     for (int ii = 0; ii < committed.count(); ++ii) {
1302         const QQmlAssociationList<int, quint32> &deps = committed.dependencies.at(ii);
1303         for (QQmlAssociationList<int, quint32>::const_iterator iter = deps.begin(); iter != deps.end(); ++iter)
1304             table[iter->first].append(qMakePair(ii, iter->second));
1305     }
1306
1307     QVector<quint32> header;
1308     QVector<quint32> data;
1309     for (int ii = 0; ii < committed.subscriptionIds.count(); ++ii) {
1310         header.append(committed.subscriptionIds.count() + data.count());
1311         const QList<QPair<int, quint32> > &bindings = table[ii];
1312         data.append(bindings.count());
1313         for (int jj = 0; jj < bindings.count(); ++jj) {
1314             data.append(bindings.at(jj).first);
1315             data.append(bindings.at(jj).second);
1316         }
1317     }
1318     header << data;
1319
1320     return QByteArray((const char *)header.constData(), header.count() * sizeof(quint32));
1321 }
1322
1323 QByteArray QV4CompilerPrivate::buildExceptionData() const
1324 {
1325     QByteArray rv;
1326     rv.resize(committed.exceptions.count() * sizeof(quint64));
1327     ::memcpy(rv.data(), committed.exceptions.constData(), rv.size());
1328     return rv;
1329 }
1330
1331 /*
1332 Returns the compiled program.
1333 */
1334 QByteArray QV4Compiler::program() const
1335 {
1336     QByteArray programData;
1337
1338     if (isValid()) {
1339         QV4Program prog;
1340         prog.bindings = d->committed.count();
1341
1342         Bytecode bc;
1343         QV4CompilerPrivate::Instr::Jump jump;
1344         jump.reg = -1;
1345
1346         for (int ii = 0; ii < d->committed.count(); ++ii) {
1347             jump.count = d->committed.count() - ii - 1;
1348             jump.count*= V4InstrMeta<V4Instr::Jump>::Size;
1349             jump.count+= d->committed.offsets.at(ii);
1350             bc.append(jump);
1351         }
1352
1353
1354         QByteArray bytecode;
1355         bytecode.reserve(bc.size() + d->committed.bytecode.size());
1356         bytecode.append(bc.constData(), bc.size());
1357         bytecode.append(d->committed.bytecode.constData(), d->committed.bytecode.size());
1358
1359         QByteArray data = d->committed.data;
1360         while (data.count() % 4) data.append('\0');
1361         prog.signalTableOffset = data.count();
1362         data += d->buildSignalTable();
1363         while (data.count() % 4) data.append('\0');
1364         prog.exceptionDataOffset = data.count();
1365         data += d->buildExceptionData();
1366
1367         prog.dataLength = 4 * ((data.size() + 3) / 4);
1368         prog.subscriptions = d->committed.subscriptionIds.count();
1369         prog.identifiers = d->committed.registeredStrings.count();
1370         prog.instructionCount = bytecode.count();
1371         int size = sizeof(QV4Program) + bytecode.count();
1372         size += prog.dataLength;
1373
1374         programData.resize(size);
1375         memcpy(programData.data(), &prog, sizeof(QV4Program));
1376         if (prog.dataLength)
1377             memcpy((char *)((QV4Program *)programData.data())->data(), data.constData(),
1378                    data.size());
1379         memcpy((char *)((QV4Program *)programData.data())->instructions(), bytecode.constData(),
1380                bytecode.count());
1381     }
1382
1383     if (bindingsDump()) {
1384         qWarning().nospace() << "Subscription slots:";
1385
1386         for (QQmlAssociationList<QString, int>::ConstIterator iter = d->committed.subscriptionIds.begin();
1387                 iter != d->committed.subscriptionIds.end();
1388                 ++iter) {
1389             qWarning().nospace() << "    " << iter->first << "\t-> " << iter->second;
1390         }
1391
1392         QV4Compiler::dump(programData);
1393     }
1394
1395     return programData;
1396 }
1397
1398 void QV4Compiler::enableBindingsTest(bool e)
1399 {
1400     if (e)
1401         qmlBindingsTest = true;
1402     else
1403         qmlBindingsTest = qmlBindingsTestEnv();
1404 }
1405
1406 void QV4Compiler::enableV4(bool e)
1407 {
1408     qmlEnableV4 = e;
1409 }
1410
1411 QT_END_NAMESPACE