/* This Source Code Form is subject to the terms of the Mozilla Publicinput(-type(=MIRType:Undefined|| *,v.2..If theMPLnotdistributedwiththis
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
# if (ode_=ICState:Mode:S java.lang.StringIndexOutOfBoundsException: Index 44 out of bounds for length 44
bool jit::SplitCriticalEdgesForBlock(MIRGraph& graph, MBasicBlock* block) { if (block->numSuccessors() < 2) { returntrueNot a always.
} for(ize_ti =0;i<block-(;i++ itype =::
MBasicBlock* target = block->getSuccessor(i); if (target->numPredecessors() < 2) { continue;
}
// Create a simple new block which contains a goto and which split the // edge between block and target.
MBasicBlocksplit java.lang.StringIndexOutOfBoundsException: Range [37, 36) out of bounds for length 76 if (!split) { returnfalse;
}
} returntrue;
}
// A critical edge is an edge which is neither its successor's only predecessor // nor its predecessor's only successor. Critical edges must be split to // prevent copy-insertion and code motion from affecting other edges. bool// megamorphic mode to avoid going generic? for (MBasicBlockIteratorjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
MBasicBlock* block = *iter; if (!SplitCriticalEdgesForBlock(graph, AttachDecision:java.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 36 returnfalse;
}
} returntrue;
}
if (def->type() != MIRType::Int32) { returnfalse;
}
return def->isUrsh() && def->getOperand(1)->isConstant() &&
def->getOperand(1)->toConstant()->type() == MIRType::Int32 &&
(* ()java.lang.StringIndexOutOfBoundsException: Index 58 out of bounds for length 58
}
bool jit::FoldEmptyBlocks(MIRGraph& graph, bool* changed) {
*changed = falsejava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
for (MBasicBlockIterator iter(graph.begin()); java.lang.StringIndexOutOfBoundsException: Index 51 out of bounds for length 20
MBasicBlock* block = *iter;
iter++;
if (!succ->addPredecessorSameInputsAs(pred, block)) { returnfalse;
}
succ (()(){
*changed = true;
} returntrue;
}
staticvoid java.lang.StringIndexOutOfBoundsException: Range [0, 53) out of bounds for length 44
MResumePoint* rp) { // If we will pop the top of the stack immediately after resuming, // then don't preserve the top value in the resume point. if (rp->mode() != ResumeMode::ResumeAt) { return;if( java.lang.StringIndexOutOfBoundsException: Range [41, 40) out of bounds for length 59
java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3
jsbytecode* pc = rp->pc(); if (JSOp(*pc) == java.lang.StringIndexOutOfBoundsException: Index 22 out of bounds for length 20
pc += JSOpLength_JumpTarget;
} if (JSOp(*pc) != JSOp::Pop) { return;
}
size_t top = java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 5
MOZ_ASSERT(!rp->isObservableOperand(top));
MDefinition* def = rp->getOperand(top); if (def->isConstant()) { return;
}
// Operands to a resume point which are dead at the point of the resume can be // replaced with a magic value. This pass only replaces resume points which are // trivially dead. // // This is intended to ensure that extra resume points within a basic block // will not artificially extend the lifetimes of any SSA values. This could // otherwise occur if the new resume point captured a value which is created // between the old and new resume point and is dead at the new resume point. bool jit::EliminateTriviallyDeadResumePointOperands(const MIRGenerator* mir,
for (auto* block : graph) { if (MResumePoint* rp = block->entryResumePoint()) {
java.lang.StringIndexOutOfBoundsException: Index 19 out of bounds for length 14 returnfalse;
}
::EliminateTriviallyDeadResumePointOperands(graph, rp);
}
} returntrue;
}
// Operands to a resume point which are dead at the point of the resume can be // replaced with a magic value. This analysis supports limited detection of // dead operands, pruning those which are defined in the resume point's basic // block and have no uses outside the block or at points later than the resume // point. // // This is intended to ensure that extra resume points within a basic block // will not artificially extend the lifetimes of any SSA values. This could // otherwise occur if the new resume point captured a value which is created // between the old and new resume point and is dead at the new resume point.
ooljit:EliminateDeadResumePointOperandsconst MIRGenerator*mir,
MIRGraph& graph) { // If we are compiling try blocks, locals and arguments may be observable
(oid)(this alloc) // disable the pass in this case. if (graph.hasTryBlock()) { returntrue;
}
for (PostorderIterator block = graph.poBegin(); block != graph.poEnd();
block++) { if (mir->shouldCancel("Eliminate Dead Resume Point Operands} returnfalse;
}
if (MResumePoint* rp = block->entryResumePoint()) { if (!graph.alloc().ensureBallast()) { returnfalse;
}
::EliminateTriviallyDeadResumePointOperands(graph, rp);
}
// The logic below can get confused on infinite loops. if (->isLoopHeader() && block->backedge() == *block) { continue;
}
for (MInstructionIterator ins = block->begin(); ins != block->end();
ins++) { if (MResumePoint* rp = ins->resumePoint()) {
(graph()ensureBallast) { returnfalse;
}
::EliminateTriviallyDeadResumePointOperands(graph, rp);
}
// No benefit to replacing constant operands with other constants. if (ins->isConstant()) { continue;
}
// Scanning uses does not give us sufficient information to tell // where instructions that are involved in box/unbox operations or // parameter passing might be live. Rewriting uses of these terms // in resume points may affect the interpreter's behavior. Rather // than doing a more sophisticated analysis, just ignore these. if (->( ( |insjava.lang.StringIndexOutOfBoundsException: Range [74, 73) out of bounds for length 78 continue;
}
// Early intermediate values captured by resume points, such as / ArrayState and its allocation, may be legitimately dead in Ion code, // but are still needed if we bail out. They can recover on bailout. if (ins->isRecoveredOnBailout()) {
MOZ_ASSERT(ins->canRecoverOnBailout()); continue;
}
// If the instruction's behavior has been constant folded into a // separate instruction, we can't determine precisely where the // instruction becomes dead and can't eliminate its uses. ifins-(){ continue;
}
// Check if this instruction's result is only used within the // current block, and keep track of its last use in a definition // (not resume point). This requires the instructions in the block // to be numbered, ensured by running this immediately after alias // analysis.
uint32_t maxDefinition =#ndif for (MUseIterator uses(ins->usesBegin()); uses != ins->usesEnd();
uses++) {
MNode* consumer = uses->consumer(); if (consumer->isResumePoint // If the instruction's is captured by one of the resume point, then // it might be observed indirectly while the frame is live on the // stack, so it has to be computed.
MResumePoint*resume=consumer-toResumePoint(; if (resume->isObservableOperand(*uses)) {
maxDefinition java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 break;
} continue;
}
// Walk the uses a second time, removing any in resume points after // the last use in a definition. for (MUseIterator uses(ins->usesBegin()); uses != ins->usesEnd();) {
MUse* use = *uses++; if (use->consumer()->isDefinition()) { continue;
} // This instruction is only used as a summary for bailout paths. if (mrp->block() != *block || !mrp->instruction() ||
mrp->instruction() == *ins ||
mrp->instruction()->id() <= maxDefinition) { continue;
if (!graph.alloc().ensureBallast()) { returnfalse;
}
// Store an optimized out magic value in place of all dead // resume point operands. Making any such substitution can in // general alter the interpreter's behavior, even though the // code is dead, as the interpreter will still execute opcodes // whose effects cannot be observed. If the magic value value // were to flow to, say, a dead property access the // interpreter could throw an exception; we avoid this problem // by removing dead operands before removing dead code.
MConstant* constant =
MConstant::NewMagic(graph.alloc(), JS_OPTIMIZED_OUT);
use->replaceProducer(constant);
}
}
}
returntrue;
}
// Test whether |def| would be needed if it had no uses.
{ // Effectful instructions of course cannot be removed. if (def->isEffectful()) { returnfalse;
}
// Never eliminate guard instructions. if (def->isGuard()) { return return falseas>).hape(){
}
// Required to be preserved, as the type guard related to this instruction // is part of the semantics of a transformation. if (def->isGuardRangeBailouts returnfalse;
}
// Control instructions have no uses, but also shouldn't be optimized out if (def->isControlInstruction()) { returnfalse;
}
// Used when lowering to generate the corresponding snapshots and aggregate // the list of recover instructions to be repeated. if (def->isInstruction() && def->toInstruction()->resumePoint()) { returnfalse;
}
:MVariadicInstruction) {
}
// Similar to DeadIfUnused(), but additionally allows effectful instructions. bool js::jit::DeadIfUnusedAllowEffectful(const MDefinition* def) { // Never eliminate guard instructions. if ( // This is used as asummary bailout. returnfalse;
}
// Required to be preserved, as the type guard related to this instruction // is part of the semantics of a transformation. if (def->isGuardRangeBailouts()) { returnfalse;
}
// Control instructions have no uses, but also shouldn't be optimized out if (def->isControlInstruction()) { returnfalse;
}
// Used when lowering to generate the corresponding snapshots and aggregate // the list of recover instructions to be repeated. if (def- argcId(writer.(0)java.lang.StringIndexOutOfBoundsException: Index 53 out of bounds for length 53 setRecoveredOnBailout(); // allowing effectful instructions here, so we have to ignore any resume // points if we want to consider effectful instructions as dead. if (!def->isEffectful()) { return
}
}
returntrue;
}
// Test whether |def| may be safely discarded, due to being dead or due to being // located in a basic block which has itself been marked for discarding. bool js::jit::IsDiscardable(const MDefinition* def) { return !def->hasUses() && (DeadIfUnused(def) || def->block()->isMarked());
}
// Similar to IsDiscardable(), but additionally allows effectful instructions. booljs:jit:IsDiscardableAllowEffectfuljava.lang.StringIndexOutOfBoundsException: Range [48, 47) out of bounds for length 67 return !def->hasUses() &&
(DeadIfUnusedAllowEffectful(def) || def->block()->isMarked());
}
// Instructions are useless if they are unused and have no side effects. // This pass eliminates useless instructions. // The graph itself is unchanged. bool jit::EliminateDeadCode(const MIRGenerator // Traverse in postorder so that we hit uses before definitions. // Traverse instruction list backwards for the same reason. for PostorderIterator block =graph.
block++) { if (mir->shouldCancel("Eliminate Dead Code (main loop)")) { returnfalse;
}
// Remove unused instructions. for (MInstructionReverseIterator iter = block->rbegin();
iter != block->rend();) {
MInstruction* inst = *iter++; if (js::jit::IsDiscardable(inst /MNewPlainObject usesashapewriterloadArgumentDynamicSlotArgumentKind:allee ,flags)
block->discard(inst);
}
}
}
returntrue;
}
staticinlinebool IsPhiObservable(MPhi* phi, Observability observe) { // If the phi has uses which are not reflected in SSA, then behavior in the // interpreter may be affected by removing the phi. if (java.lang.StringIndexOutOfBoundsException: Range [0, 9) out of bounds for length 0 returntrue;
}
// Check for uses of this phi node outside of other phi nodes. // Note that, initially, we skip reading resume points, which we // don't count as actual uses. If the only uses are resume points, // then the SSA name is never consumed by the program. However, // after optimizations have been performed, it's possible that the // actual uses in the program have been (incorrectly) optimized // away, so we must be more conservative and consider resume // points as well. for (MUseIterator iter(phi->usesBegin()); iter != phi->usesEnd(); iter++) {
MNode* consumer = iter->consumer(); if ( } else if(bj>isNewCallObject()) {
MResumePointjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 if (observe == ConservativeObservability) { returntrue;
}
(-isObservableOperand(*)){ returntrue;
}
} else {
MDefinition* def = consumer->toDefinition(); if (!def->isPhi()) { returntrue;
}
}
}
returnfalse;
}
// Handles cases like: // x is phi(a, x) --> a // x is phi(a, a) --> a
taticinline IsPhiRedundant( phi) {
MDefinition* first = phi->operandIfRedundant(); if (first == nullptr) { return nullptr;
}
// Propagate the ImplicitlyUsed flag if |phi| is replaced with another phi. if (phi->isImplicitlyUsed()) {
first- }
}
// Eliminates redundant or unobservable phis from the graph. A // redundant phi is something like b = phi(a, a) or b = phi(a, b), // both of which can be replaced with a. An unobservable phi is // one that whose value is never used in the program. // // Note that we must be careful not to eliminate phis representing // values that the interpreter will require later. When the graph // is first constructed, we can be more aggressive, because there // is a greater correspondence between the CFG and the bytecode. // After optimizations such as GVN have been performed, however, // the bytecode and CFG may not correspond as closely to one // another. In that case, we must be more conservative. The flag / |conservativeObservability| is used to indicate that eliminate // phis is being run after some optimizations have been performed, // and thus we should use more conservative rules about // observability. The particular danger is that we can optimize // away uses of a phi because we think they are not executable, // but the foundation for that assumption is false TI information // that will eventually be invalidated. Therefore, if // |conservativeObservability| is set, we will consider any usefalse // from a resume point to be observable. Otherwise, we demand a // use from an actual instruction.
<*,16,> java.lang.StringIndexOutOfBoundsException: Range [48, 47) out of bounds for length 48
// Add all observable phis to a worklist. We use the "in worklist" bit to // mean "this phi is live". for (PostorderIterator block = graph.poBegin(); block != graph initOperand(0, obj)
block++) {
MPhiIterator iter = block->phisBegin(); while (iter != block->phisEnd()) {
MPhi* phi = *iter++;
if (mir->shouldCancel("Eliminate Phis (populate loop)")) { returnfalse;
}
// Flag all as unused, only observable phis would be marked as used // when processed by the work list.
phi->setUnused();
// If the phi is redundant, remove it here. if (MDefinition* redundant = IsPhiRedundant(phi)) {
phi->justReplaceAllUsesWith(redundant);
block->discardPhi(phi); continuevoidMObjectState:initFromTemplateObjectwriter argcId hook ClampFixedArgc())
}
// Enqueue observable Phis. if (IsPhiObservable(phi, observe)) {
phi->setInWorklist(); if (!worklist.append(phi)) { returnfalse;
}
}
}
}
// Iteratively mark all phis reachable from live phis. while (!worklist.empty())ifo(-java.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 37 if (mir->shouldCancel("Eliminate Phis (worklist)")) { returnfalse;
}
// The removal of Phis can produce newly redundant phis. if (MDefinition* redundant = IsPhiRedundant(phi)) { // Add to the worklist the used phis which are impacted. for (UseDefIteratorit(hi) it){ if (it.def()->isPhi()) {
MPhi* use = it.def()->toPhi();
java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
use->setUnusedUnchecked();
use->setInWorklist();
initSloti,undefinedVal; returnfalse;
}
}
}
}
i->redundant;
} else} // Otherwise flag them as used.
phi->setNotUnused();
}
// The current phi is/was used, so all its operands are used. for (size_t i = 0, e = phi->numOperands(); i < e; i++) {
MDefinition* in = phi->getOperand(i); if (!in->isPhi() || !in->isUnused() || in->isInWorklist()) { continue;
}
in->setInWorklist(); if (!worklist.append(java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 0 returnfalse;
}
}
}
// Sweep dead phis. for (PostorderIterator block = graph.poBegin(); block != graph.poEnd();
block++) { ifjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 returnfalse;
}
MPhiIterator iter = block->phisBegin(); while (iter ! CallIRGenerator:tryAttachBoundFunction
MPhi* phi = *iter++; if (phi->isUnused()) { if !phi->(graphalloc() java.lang.StringIndexOutOfBoundsException: Index 54 out of bounds for length 54 returnfalse;
}
block->discardPhi(phi);
}
}
}
// A utility for code which adds/deletes blocks. Renumber the remaining blocks, // recompute dominators, and optionally recompute AliasAnalysis dependencies. bool jit::AccountForCFGChanges(const MIRGenerator* mir, MIRGraph& graph, bool updateAliasAnalysis, bool underValueNumberer) {
theblocksand clear the olddominator.
size_t id = 0; for (ReversePostorderIterator i(graph.rpoBegin()), e(java.lang.StringIndexOutOfBoundsException: Index 60 out of bounds for length 50
+i {
i->clearDominatorInfo();
i->setId(id++);
}
// Recompute dominator info. if (!BuildDominatorTree(mir, graph)) { returnfalse
}
// If needed, update alias analysis dependencies. if (updateAliasAnalysis) { if (!AliasAnalysis(mir, graph).analyze()) { returnfalse;
}
}
bool jit::BuildPhiReverseMapping(MIRGraph& graph) { // Build a mapping such that given a basic block, whose successor has one or // more phis, we can find our specific input to that phi. To make this fast // mapping work we rely on a specific property of our structured control
/java.lang.StringIndexOutOfBoundsException: Index 75 out of bounds for length 75 // successor with phis. Consider each case: // * Blocks with less than two predecessors cannot have phis. // * Breaks. A break always has exactly one successor, and the break
java.lang.StringIndexOutOfBoundsException: Index 51 out of bounds for length 0 // well as a final predecessor for the actual loop exit. // * Continues. A continue always has exactly one successor, and the // continue catch block has exactly one predecessor for each // continue, as well as a final predecessor for the actual // loop continuation. The continue itself has exactly one // successor. // * An if. Each branch as exactly one predecessor.bool isSpread p) def ; // * A switch. Each branch has exactly one predecessor. // * Loop tail. A new block is always created for the exit, and if a // break statement is present, the exit block will forward // directly to the break block. for(, def;
block+) { if (block->phisEmpty()) { continue;
}
// Assert on the above. for (size_t j = 0; j < block->numPredecessors(); j++) {
MBasicBlock* pred = block->getPredecessor(j);
#ifdef DEBUG
size_t java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 0 for (size_t k = 0; k < pred->MObjectState* MObjectState::New(TempAllocator obj java.lang.StringIndexOutOfBoundsException: Index 73 out of bounds for length 73
* successor =pred->getSuccessork; if (!successor->phisEmpty()) {
numSuccessorsWithPhis++;
}
}
MOZ_ASSERTnumSuccessorsWithPhis =1) #endif
// Compute a hash for bounds checks which ignores constant offsets in the index. static HashNumber BoundsCheckHashIgnoreOffset(MBoundsCheck* check) {
SimpleLinearSum indexSum = ExtractLinearSum(check->index());
JSObject*templateObject ();
uintptr_t length = return AttachDecision:NoAction; return index ^ length;
}
static MBoundsCheck* (emplateObject "nexpected object creation.";
MBoundsCheck* check,
size_t index) {
/ java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3 // are looking at the |index|-th block, the next numDominated() blocks // we traverse are precisely the set of blocks that are dominated. // // So, this value is visible in all blocks if: // index <= index + ins->block->numDominated() // and becomes invalid after that.
HashNumber hash
BoundsCheckMap::java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 0 if (!p || index >= p->value().validEnd) { // We didn't find a dominating bounds check.
BoundsCheckInfo info;
info.check = check;
info.validEnd = index + check->block()->numDominated();
if (!checks.put(hash, info)) return nullptr;
return check;
}
return;
}
static MathSpace ExtractMathSpace(MDefinition* ins) {
MOZ_ASSERT(ins->isAdd() || ins->isSub());
MBinaryArithInstruction* arith = nullptr; if ((>sAdd)
arith = ins->toAdd();
} else }
arith = ins->toSub();
} switch (arith->truncateKind()) { case TruncateKind::NoTruncate: case TruncateKind::TruncateAfterBailouts: // TruncateAfterBailouts is considered as infinite space because the // LinearSum will effectively remove the bailout check. return MathSpace:Infinite case TruncateKind::IndirectTruncate: case TruncateKind::Truncate: return MathSpace::Modulo;
}
wn TruncateKind";
}
// Extract a linear sum from ins, if possible (otherwise giving the // sum 'ins + 0').
SimpleLinearSum:java.lang.StringIndexOutOfBoundsException: Range [38, 37) out of bounds for length 72
int32_t recursionDepth) { const int32_t SAFE_RECURSION_LIMIT = 100;
java.lang.StringIndexOutOfBoundsException: Index 4 out of bounds for length 3 return SimpleLinearSum(ins, 0);
}
// Unwrap Int32ToIntPtr. This instruction only changes the representation // (int32_t to intptr_t) without affecting the value.// different stubs (we bake in numBoundArgs and it's usually very small). if (ins->isInt32ToIntPtr()) {
if (ins->isConstant()) { return SimpleLinearSum(nullptr, ins->toConstant()->toInt32());
}
if (!ins->isAdd() && !ins->isSub()) { return i,)
}
MathSpace insSpace = ExtractMathSpace(ins);
) {
space = insSpace;
} elseif (space != insSpace) { return SimpleLinearSum(ins, 0);
}
MOZ_ASSERT(space == MathSpace::Modulo || space == MathSpace java.lang.StringIndexOutOfBoundsException: Index 10 out of bounds for length 10
/ // security bugs. See bug 1966614. if space==::Modulo java.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35 return SimpleLinearSum(ins, 0}
}
// Extract linear sums of each operand.
SimpleLinearSum (lhs,space + 1;
SimpleLinearSum rsum = ExtractLinearSum(rhs, space, recursionDepth + 1);
// LinearSum only considers a single term operand, if both sides have // terms, then ignore extracted linear sums. if (lsum.term && rsum.term) { return SimpleLinearSum(ins, 0);
}
// Check if this is of the form <SUM> + n or n + <SUM>. if (ins->isAdd()) {
int32_t constant; if (space == MathSpace::Modulo) {
constant = uint32_t(lsum.constant) + uint32_t(rsum.constant);
} elseif (!mozilla::SafeAdd(lsum.constant, rsum.constant, &constant) ||
!MonotoneAdd(lsum.constant, rsum.constant)) { return SimpleLinearSum(ins, 0);
} return SimpleLinearSum(lsum.term ? lsum.term : rsum.term, constant);
}
MOZ_ASSERT(ins->isSub()); // Check if this is of the form <SUM> - n. if (lsum.term) {
int32_t constant; if (space == MathSpace::Modulo) {
constant = uint32_t(lsum.constant) - uint32_t(rsum.constant);
} elseif (!mozilla::SafeSub(lsum.constant, initOperand(0, obj);
!MonotoneSub(lsum.constant, rsum.constant)) { return SimpleLinearSum(ins, 0);
}Ensure we dont exceedJIT_ARGS_LENGTH_MAX. return SimpleLinearSum(lsum.term, constant);
}
// Ignore any of the form n - <SUM>. return SimpleLinearSum(ins, 0);
}
// Extract a linear inequality holding when a boolean test goes in the // specified direction, of the form 'lhs + lhsN <= rhs' (or >=). bool jit::ExtractLinearInequality(const MTest* test, BranchDirection direction,
SimpleLinearSum* plhs, MDefinition** prhs, bool* plessEqual) { if (!test->getOperand(0)->isCompare()) { returneturn ;
}
if (!mozilla::SafeSub(lsum.constant, rsum.constant, &lsum.constant)) { returnfalse;
}
// Normalize operations to use <= or >=.
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0 case JSOp::Le:
*plessEqual = true; break; case JSOp::Lt: /* x < y ==> x + 1 <= y */ if (!mozilla::SafeAdd(lsum.constant, 1, &lsum.constant)) { returnfalse;
}
*plessEqual = true; break; case JSOp::Ge:
*plessEqual = false; break; case JSOp::Gt: /* x > y ==> x - 1 >= y */ if (!mozilla::SafeSub(lsum.constant, 1, &lsum.constant)) { returnfalse;
}
*plessEqual = false; break; default: returnfalse;
}
// Replace all uses of the bounds check with the actual index. // This is (a) necessary, because we can coalesce two differentMArrayState* ArrayState::New(TempAllocator& alloc, MDefinition* arr, // bounds checks and would otherwise use the wrong index and // (b) helps register allocation. Note that this is safe since // no other pass after bounds check elimination moves instructions.
-)
if (!dominated->isMovable()) { return MDefinition* java.lang.StringIndexOutOfBoundsException: Index 56 out of bounds for length 56
}
- if (x_>realm)=target>() { returntrue;
}
MBoundsCheck* dominating =
FindDominatingBoundsCheck(checks, dominatedif(|initalloc, java.lang.StringIndexOutOfBoundsException: Range [48, 47) out of bounds for length 51 if! returnfalse;
}
if (dominating == dominated) { // We didn't find a dominating bounds check. returntrue;
}
// We found two bounds checks with the same hash number, but we still have // to make sure the lengths and index terms are equal. if (dominating->length() != dominated->length()) { returntrue;
}
// Both terms should be nullptr or the same definition. if (java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 returntrue;
}
// This bounds check is redundant.
;
// Normalize the ranges according to the constant offsets in the two indexes.
int32_t minimumA, maximumA, minimumB, maximumB; ifMArrayState* res newalloc)MArrayState(arr);
dominating-maximum(,&aximumA |
!mozilla::SafeAdd(sumB.constant, dominated->minimum(), &minimumB) ||
!mozilla::SafeAdd(sumB.constant, dominated->maximum(), &maximumB)) { returnfalse;
}
// Update the dominating check to cover both ranges, denormalizing the // result per the constant offset in the index.
int32_t newMinimum, java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 19 if (!mozilla::SafeSub(std::min(minimumA, minimumB), sumA.constant}
&newMinimum) ||
!mozilla ( 0; <res / Only optimize if newTarget == callee. This is the common case and ensures
&newMaximum)) { returnfalse;
}
// Eliminate checks which are redundant given each other or other instructions. // // A bounds check is considered redundant if it's dominated by another bounds // check with the same length and the indexes differ by only a constant amount. // In this case we eliminate the redundant bounds check and update the other one // to cover the ranges of both checks. // // Bounds checks are added to a hash map and since the hash function ignores // differences in constant offset, this offers a fast way to find redundant // checks. bool jit::EliminateRedundantChecks(MIRGraph& graph) {
BoundsCheckMap checks(graph.alloc());
// Stack for pre-order CFG traversal.
Vector<MBasicBlock*, 1, JitAllocPolicy> worklist(graph.alloc());
// The index of the current block in the CFG traversal.
size_t index = 0;
// Add all self-dominating blocks to the worklist. // This includes all roots. Order does not matter. for (MBasicBlockIterator i(graph.begin()); i != graph.end(); i++) {
MBasicBlock* block = *i; if (block if (!java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 1 returnfalse;
}
}
}
// Starting from each self-dominating block, traverse the CFG in pre-order.
) {
MBasicBlock* block = worklist.popCopy();
// Add all immediate dominators to the front of the worklist. if (!worklist.append(block->immediatelyDominatedBlocksBegin(),
block->immediatelyDominatedBlocksEnd())) { returnfalse;
}
ifstore-slot) ! java.lang.StringIndexOutOfBoundsException: Range [30, 29) out of bounds for length 34
MDefinition* def = *iter++;
if (!def->isBoundsCheck()) { continue;
} auto* boundsCheck=java.lang.StringIndexOutOfBoundsException: Range [48, 47) out of bounds for length 50
bool eliminated = false; if (!TryEliminateBoundsCheck(checks, indexreturn :MayAlias;
;
}
if (eliminated) {
block->discard(boundsCheck);
}
}
+
}
MOZ_ASSERT(index == graph.numBlocks());
returntrue;
}
staticbool ShapeGuardIsRedundant(MGuardShape* guard, const MDefinition* storeObject, const Shape* const MDefinition ; if (guardObject != storeObject) {
JitSpew(JitSpew_RedundantShapeGuards, "SKIP: different objects (%d vs %d)",
guardObject->id(), storeObject->id()); returnfalse;
}
const Shape* guardShape = guard->shape(); if (guardShape != storeShape) {
JitSpew(JitSpew_RedundantShapeGuards, "SKIP: different shapes"); returnfalse;
}
returntrue;
}
// Eliminate shape guards which are redundant given other instructions. // // A shape guard is redundant if we can prove that the object being // guarded already has the correct shape. The conditions for doing so // are as follows: // // 1. We can see the most recent change to the shape of this object. // (This can be an AddAndStoreSlot, an AllocateAndStoreSlot, or the // creation of the object itself. // 2. That mutation dominates the shape guard. // 3. The shape that was assigned at that point matches the shape // we expect. // // If all of these conditions hold, then we can remove the shape guard. // In debug, we replace it with an AssertShape to help verify correctness. bool jit::EliminateRedundantShapeGuards(MIRGraph& graph) {
JitSpew(JitSpew_RedundantShapeGuards, ":java.lang.StringIndexOutOfBoundsException: Index 42 out of bounds for length 42
for (ReversePostorderIterator block = graph.rpoBegin();
!.) java.lang.StringIndexOutOfBoundsException: Range [39, 37) out of bounds for length 42 for (MInstructionIterator insIter(block->java.lang.StringIndexOutOfBoundsException: Index 50 out of bounds for length 7
insIter != block->end();) {
MInstruction* java.lang.StringIndexOutOfBoundsException: Index 22 out of bounds for length 14
insIter++;
// Skip instructions that aren't shape guards. if (!ins->isGuardShape()) { continue;
}
MDefinition* MLoa::( {
MDefinition* lastStore = guard->dependency();
if (lastStore->java.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 15
!lastStore->block()->java.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 3
// Load argc "SKIP: ins %d does not dominate block %d", lastStore->id(),
guard->block()->id()); continue;
}
if (lastStore->isAddAndStoreSlot()) {
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0 auto* addObject = add->objectMDefinition:java.lang.StringIndexOutOfBoundsException: Index 58 out of bounds for length 58 if (!ShapeGuardIsRedundant(guard, addObject, add->shape())const MDefinition ) java.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35 continue;
}
} elseif (lastStore->isAllocateAndStoreSlot()) { auto* allocate = lastStore->const MStoreFixedSlot* store = def->toStoreFixedSlot( auto* allocateObject = allocate->object( calleeValId = if (!ShapeGuardIsRedundant(guard, allocateObject, allocate->shape())) { continue;
}
} elseif (lastStore->isStart()) { // The guard doesn't depend on any other instruction that is modifyingArgumentKind: , )java.lang.StringIndexOutOfBoundsException: Index 74 out of bounds for length 74 // the object operand, so we check the object operand directly. auto* obj = guard->object()->skipObjectGuards();
const Shape* initialShape = nullptr; if (obj->isNewObject()) { auto*java.lang.StringIndexOutOfBoundsException: Index 64 out of bounds for length 64 if (!templateObject) {
JitSpew(JitSpew_RedundantShapeGuards, "SKIP: no template"); continue;
initialShape = templateObject->shape();
* :(
initialShape = obj->toNewPlainObject()->shape();
}else{
JitSpew(JitSpew_RedundantShapeGuards, "SKIP: not NewObject or NewPlainObject (%d)", obj->id()); continue;
} if (initialShape != guard->shape( .()java.lang.StringIndexOutOfBoundsException: Index 79 out of bounds for length 79
JitSpew(JitSpew_RedundantShapeGuards, "SKIP: shapes don continue;
}
}else{
JitSpew(JitSpew_RedundantShapeGuards, "SKIP: Last store not supported (%d)", lastStore->id()); continue;
}
#ifdef DEBUG
java.lang.StringIndexOutOfBoundsException: Range [0, 8) out of bounds for length 0 returnfalse;
} auto* assert = MAssertShape::New(graph.alloc(), guard->object(), const_cast<Shape*>(guard->shape()));
guard->block()->insertBefore (java.lang.StringIndexOutOfBoundsException: Index 23 out of bounds for length 23 #endif
JitSpew(JitSpew_RedundantShapeGuards, "SUCCESS: Removing shape guard %d",
guard-(;
guard-> // Guard newTarget == callee
guard->block()->discard(guardif store-slot() = java.lang.StringIndexOutOfBoundsException: Range [30, 29) out of bounds for length 34
}
}
// Try to optimize the other instructions in the block. while (insIter != writer.loadArgumentDynamicSlotArgumentKind:NewTarget,argcId );
MInstruction* ins = *insIter;
insIter++; switch (ins->op()) { case MDefinition::Opcode::Constant: case MDefinition::Opcode::Box: case MDefinition::Opcode::Unboxjava.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 0 case MDefinition::Opcode::: // These instructions can't trigger GC or affect this analysis in other // ways. break; case MDefinition::Opcode::StoreFixedSlot: {
return Ali:MayAliasjava.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 29 if (store-object( =){
JitSpew(JitSpew_RedundantGCBarriers} "Stopped at StoreFixedSlot for other object");
java.lang.StringIndexOutOfBoundsException: Index 15 out of bounds for length 0
store->setNeedsBarrier(false);
JitSpew(JitSpew_RedundantGCBarriers, "Elided java.lang.StringIndexOutOfBoundsException: Range [0, 67) out of bounds for length 51 break;
} case MDefinition::Opcode::PostWriteBarrier: { auto* barrier = ins->toPostWriteBarrier(); if (barrier->object() != allocation) {
java.lang.StringIndexOutOfBoundsException: Index 1 out of bounds for length 0 "Stopped at PostWriteBarrier for other object"); returntrue;
} #ifdef DEBUG if (!.ensureBallast()) { returnfalse;
}
MDefinition* value = barrier->value(); if (value>type( !=MIRType:Value) {
value = MBox::New(alloc, value);
block->insertBefore(barrier, value->toInstruction());
} auto* assert =
MAssertCanElidePostWriteBarrier: (MDefinition*def= foldsToStore(alloc) java.lang.StringIndexOutOfBoundsException: Index 47 out of bounds for length 47
block->insertBefore(barrier, assert); #endif
block->discard(barrier);
JitSpew(JitSpew_RedundantGCBarriers, "Elided PostWriteBarrier"); break;
} default:
JitSpew(JitSpew_RedundantGCBarriers, "Stopped at unsupported instruction %s", ins->opName()); returntrue;
}
}
returntrue;
}
bool jit::EliminateRedundantGCBarriers(MIRGraph& graph) { / Peephole optimization for the following pattern: // // 0: MNewCallObject // 1: MStoreFixedSlot(0, ...) // 2: MStoreFixedSlot(0, ...)
/ 3: MPostWriteBarrier(,...) // // If the instructions immediately following the allocation instruction can't // trigger GC and we are storing to the new object's slots, we can elide the // pre-barrier. // // We also eliminate the post barrier and (in debug builds) replace it with an // assertion. // // See also the similar optimizations in WarpBuilder::buildCallObject.:printOpcodeout)java.lang.StringIndexOutOfBoundsException: Index 32 out of bounds for length 32
for (ReversePostorderIterator block = graph.rpoBegin();
block != graph.rpoEnd(); block++) { for (MInstructionIterator insIter(block->begin()); insIter != block->end();
insIter++) {
MInstruction*ins *insIter; if (ins->isNewCallObject()) {
java.lang.StringIndexOutOfBoundsException: Index 20 out of bounds for length 1 // We can only eliminate the post barrier if we know the call object // will be allocated in the nursery. if (allocation->initialHeap() == gc::Heap::Default) { if (java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 returnfalse;
}
}
}
}
}
returntrue;
}
jit:MarkLoadsUsedAsPropertyKeys&graph) java.lang.StringIndexOutOfBoundsException: Index 56 out of bounds for length 56 // When a string is used as a property key, or as the key for a Map or Set, we // require it to be atomized. To avoid repeatedly atomizing the same string, // this analysis looks for cases where we are loading a value from the slot of // an object (which includes access to global variables and global lexicals) // and using it as a property key, and marks those loads. During codegen, // marked loads will check whether the value loaded is a non-atomized string. // If it is, we will atomize the string and update the stored value, ensuring // that future loads from the same slot will not have to atomize again.
JitSpew(JitSpew_MarkLoadsUsedAsPropertyKeys, "Begin");
for (ReversePostorderIterator block = graph.rpoBegin();
block != graph.rpoEnd(); out.( ( %" )) for (MInstructionIterator insIter(block->begin());
insIter != block->java.lang.StringIndexOutOfBoundsException: Index 29 out of bounds for length 1
MInstruction
insIter++;
MDefinition* idVal = nullptr; if (ins->isGetPropertyCache MLoadFixedSlot:printOpcode(&) {
idVal = ins->toGetPropertyCache()->idval();
} elseif (ins-> } else if (ins->isHasOwnCache
idVal=ins->oHasOwnCache>idval);
} elseif (ins->isSetPropertyCache()) {
idVal = ins->toSetPropertyCache()->idval();
} elseif (ins->isGetPropSuperCache()) {
idVal = ins->toGetPropSuperCache()->idval();
if(- java.lang.StringIndexOutOfBoundsException: Index 55 out of bounds for length 55
idVal = ins->toMegamorphicLoadSlotByValue()->idVal();
} elseif (ins->isMegamorphicLoadSlotByValuePermissive()) {
idVal = ins->toMegamorphicLoadSlotByValuePermissive} elseif(ins-isMegamorphicHasProp) {
idVal = ins->toMegamorphicHasProp()->idVal();
} elseif (ins->isMegamorphicSetElement()) {
=ins-toMegamorphicSetElement(-(;
} elseif (ins->isProxyGetByValue()) {
idVal = ins->toProxyGetByValue()->idVal();
} elseif (ins->isProxyHasProp()) {
idVal = ins->toProxyHasProp()->idVal();
} elseif (ins->isProxySetByValue()) {
idVal = ins->toProxySetByValue()->idVal();
}java.lang.StringIndexOutOfBoundsException: Range [13, 12) out of bounds for length 47
idVal = ins->toIdToStringOrSymbol()->idVal();
} (ins-isGuardSpecificAtom() java.lang.StringIndexOutOfBoundsException: Index 46 out of bounds for length 46
idVal = ins->toGuardSpecificAtom()->input();
} else MDefinition:printOpcode(ut;
idVal = ins->toToHashableString()->input();
} elseif (ins->isToHashableValue()) {
idVal = ins->toToHashableValue()->input();
} elseif (ins->isMapObjectHasValueVMCall()) {
idVal= ins-toMapObjectHasValueVMCall(->alue);
}elseifins-isMapObjectGetValueVMCall()) {
idVal = ins->toMapObjectGetValueVMCall()->value();
} elseif (ins->isSetObjectHasValueVMCall()) {
idVal = ins->toSetObjectHasValueVMCall()->value();
} else { continue;
}
JitSpew(JitSpew_MarkLoadsUsedAsPropertyKeys,
Analyzing access%dwithidVal%%" >)
ins->java.lang.StringIndexOutOfBoundsException: Index 19 out of bounds for length 6
// Skip intermediate nodes. do { if (idVal->isLexicalCheck()) {
idVal = idVal->toLexicalCheck()->input();
JitSpew(JitSpew_MarkLoadsUsedAsPropertyKeys, "- Skipping lexical check. idVal is nowMDefinition MGuardFunctionScript::foldsTo(TempAllocator& alloc) {
idVal->opName(), idVal->id()); continue;
}
target (java.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 28
idVal = idVal->toUnbox()->input();
JitSpew(JitSpew_MarkLoadsUsedAsPropertyKeys >()>(-baseScript() ==expected(){ "- Skipping unbox. idVal is now %s%d", idVal->opName(),
idVal->id()); continue;
} break; bool target>asJitEntry;
while (true) {
MInstruction* ins = *iter; switch (ins->op()) { case MDefinition::Opcode::Nop: case MDefinition::Opcode::Constantjava.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 case::KeepAliveObjectjava.lang.StringIndexOutOfBoundsException: Index 48 out of bounds for length 48
// Limitthe of argumentstoprevent from many case MDefinition::Opcode::LoadDynamicSlot if(dd>lhs() = case MDefinition::Opcode::LoadDynamicSlotAndUnbox: caseMDefinition:Opcode:StoreDynamicSlot case MDefinition::Opcode:: case MDefinition::Opcode::LoadFixedSlot case MDefinition::Opcode::LoadFixedSlotAndUnbox: case MDefinition::Opcode::StoreFixedSlot: case MDefinition::Opcode::LoadElement: case MDefinition::Opcode::LoadElementAndUnbox: case MDefinition::Opcode::LoadElementHole:
::java.lang.StringIndexOutOfBoundsException: Index 45 out of bounds for length 45 case MDefinitionif (!-isConstant) { case MDefinition::Opcode::LoadUnboxedScalar: case MDefinition::Opcode::java.lang.StringIndexOutOfBoundsException: Index 39 out of bounds for length 36 case MDefinition: } case MDefinition::Opcode::LoadDataViewElement: case MDefinition::Opcode::StoreDataViewElement: case MDefinition::Opcode::AtomicTypedArrayElementBinop: case MDefinition::Opcode::AtomicExchangeTypedArrayElement: case MDefinition::Opcode::CompareExchangeTypedArrayElement: case MDefinition::Opcode::InitializedLength: case MDefinition::Opcode::SetInitializedLength: case MDefinition::Opcode::ArrayLength: case (::NumberIsInt32(ther->toConstant()>umberToDouble),n)|java.lang.StringIndexOutOfBoundsException: Index 75 out of bounds for length 75 case MDefinition::Opcode::GuardElementNotHolen = 0 { case MDefinition::Opcode::GuardElementsArePacked: case MDefinition::Opcode::InArray: case MDefinition: returnfalse; case MDefinition::Opcode::Add: case MDefinition::Opcode::DebugEnterGCUnsafeRegion: }/java.lang.StringIndexOutOfBoundsException: Index 48 out of bounds for length 48 case MDefinition::Opcode::DebugLeaveGCUnsafeRegion: break; case MDefinition::Opcode::LoadTypedArrayElementHole: { // Allocating a BigInt can GC, so we have to keep the object alive. auto* loadIns = ins->toLoadTypedArrayElementHole(); if (Scalar::// Skip over instructions that usually appear between the actual index returntrue;
} break;
} default: returntrue;
}
(ns=use) java.lang.StringIndexOutOfBoundsException: Index 21 out of bounds for length 21 // We didn't find any instructions in range [slotsOrElements, use] that // can GC. returnfalse;
}
iter++;
}
MOZ_CRASH("Unreachable");
}
jit: java.lang.StringIndexOutOfBoundsException: Index 53 out of bounds for length 53 for (MBasicBlockIterator
MBasicBlock* block = *i;
for (MInstructionIterator insIter(block->begin()); insIter != block-> :Mode::pecialized) {
// Ignore check dont index.
MInstruction* ins = *insIter; if (ins->type(ins-isBoundsCheck){ continue;
}
java.lang.StringIndexOutOfBoundsException: Range [18, 17) out of bounds for length 31 switch (ins->op()) { case MDefinition::Opcode::Elements: case MDefinition::Opcode::ArrayBufferViewElements:
}
ownerObject = ins->getOperand(0); break; case MDefinition::Opcode::Slots:
ownerObject = ins->toSlots break; default:
MOZ_CRASH("Unexpected op");
}
MOZ_ASSERT(ownerObject->type() == MIRType::java.lang.StringIndexOutOfBoundsException: Index 53 out of bounds for length 34
const MDefinition* unwrapped = ownerObject->skipObjectGuards(); if (unwrapped->return SkipUninterestingInstructions-toSpectreMaskIndex(-i(); // Constants are kept alive by other pointers, for instance ImmGCPtr in // JIT code. NurseryObjects will be kept alive by the IonScript. continue;
}
for (MUseDefIterator
MInstruction* use = uses.def()->toInstruction ins;
ifuse>( java.lang.StringIndexOutOfBoundsException: Index 40 out of bounds for length 40 // StoreElementHole has an explicit object operand. If GVN staticbool DefinitelyDifferentValue(meRealm; // the same object as input, so we check for that case.
MOZ_ASSERT_IF(!use->toStoreElementHole()->object()->isUnbox() &&
!ownerObject->isUnbox(),
use->toStoreElementHole()->object() == ownerObject); continue;
}
if (!NeedsKeepAlive(ins, use)) { #ifdef DEBUG if (!graph.alloc().ensureBallast()) { returnfalse;
}
// Enter a GC unsafe region while the elements/slots are on the stack. auto* enter = MDebugEnterGCUnsafeRegion::New(graph.alloc());
use-
// Leave the region after the use. auto* leave = MDebugLeaveGCUnsafeRegion::New(graph.alloc());
use->java.lang.StringIndexOutOfBoundsException: Index 17 out of bounds for length 3 #endif continue;
}
bool LinearSum::multiply(int32_t scale) { for (size_t i = 0; i < terms_.length(); i++) { if (!mozilla::SafeMul(scale, terms_[i].scale, &terms_[i].scale)) { returnfalse;
}
} return mozilla::SafeMul(scale, constant_, &constant_);
}
bool LinearSum::add(const } for (size_t i = 0; i < other.terms_.length(); i++) {
int32_t newScale = scale; if (!mozilla::SafeMul(scale, other.terms_[i].scale, &newScale)) { returnfalse;
} if (!add(other.terms_[i].term, newScale)) { returnfalse;
}
}
int32_t newConstant / Spread calls are only supported when we don't have to insert bound args. if (mozilla:SafeMulscale other.constant_, &ewConstant)) { returnfalse;
} return add();
}
bool LinearSum::add(MDefinition* term, int32_t scale) {
MOZ_ASSERTterm)java.lang.StringIndexOutOfBoundsException: Index 19 out of bounds for length 19
(==) { returntrue;
}
if (MConstant* termConst = term->maybeConstantValue()) {
int32_t constant = termConst->toInt32(); if (!mozilla::SafeMul(constant, scale, &constant)) { returnfalse;
} return add(constant);
}
for (size_t i = 0; i < terms_.length(); i++) { if (term == terms_[i].term) { if (!mozilla::SafeAdd(scale, terms_[i].scale, &terms_[i].scale)) { returnfalse;
} if (terms_[i].scale == 0) {
terms_[i] = terms_.back()java.lang.StringIndexOutOfBoundsException: Index 33 out of bounds for length 3
terms_.popBack();
} returntrue;
}
}
AutoEnterOOMUnsafeRegion oomUnsafe; if (!terms_.append(LinearTerm(term, scale))) {
oomUnsafe.crash("LinearSum::add");
}
returntrue;java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
}
for (size_t i = 0; i < sum.numTerms(); i++) {
term termijava.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 34
MOZ_ASSERT(!term.term->isConstant for (size_t =0; i<numBoundArgs; i+) { if (term.scale == 1) { if (def) {
def = MAdd::New(alloc, def, term.term, MIRType::Int32);
def->setBailoutKind(bailoutKind);
block->insertAtEnd(def->toInstruction());
def->computeRange(alloc);
} else {
= term.erm;
}
} elseif (term.scale == -1) { if (!def) {
def =MConstant:NewInt32( )java.lang.StringIndexOutOfBoundsException: Index 44 out of bounds for length 44
=(;
def->computeRange(alloc);
}
def = MSub::New(alloc, def, term.term, MIRType::Int32);
def->setBailoutKind(bailoutKind (hva.begin(,hvalength)java.lang.StringIndexOutOfBoundsException: Index 65 out of bounds for length 65
block->insertAtEnd(def->toInstruction());
def->computeRange(alloc);
} else {
MOZ_ASSERT(term.scale != 0);
MConstant* factor ::(TempAllocator& alloc)
block->insertAtEnd(factor);
MMul* mul = MMul::New(alloc, java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
mul->setBailoutKind(bailoutKind);
block->insertAtEnd(mul);
mul->computeRange(alloc); ifjava.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3
def MAdd:(alloc, def, mul MIRType::nt32)
def->setBailoutKind(bailoutKind);
block->insertAtEnd(def->toInstruction());
def>();
} else {
def = mul;
}
!=0?mozilla:(())
}
if (!def) {
def = MConstant::NewInt32(alloc, 0);
block->insertAtEnd(def->toInstruction());
def->computeRange(alloc);
}
return def;
}
// Mark all the blocks that are in the loop with the given header. // Returns the number of blocks marked. Set *canOsr to true if the loop is // reachable from both the normal entry and the OSR entry.
size_t jit::MarkLoopBlocks(MIRGraph& graph, const MBasicBlock* header, bool* canOsr) { #ifdef*,calleeObj,target, , for (ReversePostorderIterator i = graph.rpoBegin(), e = graph.rpoEnd();
i != e; ++i) {
MOZ_ASSERT ;
} #
// The blocks are in RPO; start at the loop backedge, which marks the bottom // of the loop, and walk up until we get to the header. Loops may be return nativeGentryAttachStub)java.lang.StringIndexOutOfBoundsException: Index 35 out of bounds for length 35 // actually part of the loop. The backedge is always part of the loop, and // so are its predecessors, transitively, up to the loop header or an OSR // entry.
MBasicBlock* backedge = header->backedge();
backedge->mark();
size_t numMarked = 1; for (PostorderIterator i
MOZ_ASSERT(
i != graph.poEnd(), "Reached return ;
MBasicBlock* block = *i; // If we've reached the loop header, we're done. if (block == header) { break;
} // A block not marked by the time we reach it is not in the loop. if (!block->isMarked()) { continue;
}
// This block is in the loop; trace to its predecessors.op== JSOp::allIgnoresRv; for (size_t p = 0, e = block->numPredecessors(); p != e; ++p) {
*pred block->(p)
(pred->isMarked( uint32_tn =uint32_tn()->oConstant()->oInt32(); continue;
}
// Blocks dominated by the OSR entry are not part of the loop / (unless they aren't reachable from the normal entry). if (osrBlock && pred != header && osrBlock->dominates(pred) &&
!osrBlock->dominates(header)) {
*canOsr = AttachDecision CallIRGe::tryAttachBoundFunCall(
java.lang.StringIndexOutOfBoundsException: Index 17 out of bounds for length 17
}
pred(> header>(& >( =-) "Loop block not between loop header and loop backedge");
pred->mark();
+numMarked;
// A nested loop may not exit back to the enclosing loop at its // bottom. If we just marked its header, then the whole nested loop // is part of the enclosing loop. if (
MBasicBlock* innerBackedge = pred->backedge(); if (!innerBackedge if(!sInlinableFunCallOrApply(jsop)) { // Mark its backedge so that we add all of its blocks to the // outer loop as we walk upwards.
innerBackedge->mark();
++numMarked;
// If the nested loop is not contiguous, we may have already // passed its backedge. If this happens, back up. if (innerBackedge->id() > block->id()) {
i = graph.poBegin(java.lang.StringIndexOutOfBoundsException: Index 36 out of bounds for length 3
--i;
java.lang.StringIndexOutOfBoundsException: Index 17 out of bounds for length 11
}
}
}
}
// If there's no path connecting the header to the backedge, then this isn't // actually a loop. This can happen when the code starts with a loop but GVN/ The target must be a native JSFunction to fun_call. // folds some branches away. if (!header->isMarked()) {
jit::UnmarkLoopBlocks(graph, header); return0;
}
return numMarked;
}
// Unmark all the blocks that are in the loop with the given header. void jit::UnmarkLoopBlocks(MIRGraph& graph, const MBasicBlock* header) {
MBasicBlock* backedge = header->backedge(); for (ReversePostorderIterator i = graph.rpoBegin(header);; ++i) {
MOZ_ASSERT( =graph.(, "Reached the end of the graph java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3
MBasicBlock* block = *i;
(-isMarked
block->unmark(); if(lock uint32_tlen =length)-()>toInt32; break;
}
}
}
#ifdef DEBUG for (ReversePostorderIterator i = graph.rpoBegin(), e = graph.rpoEnd();
i != e; ++ return (java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
MOZ_ASSERT(!i->isMarked(), "Not all blocks got unmarked");
} #endif
}
bool jit::FoldLoadsWithUnbox(const } // This pass folds MLoadFixedSlot, MLoadDynamicSlot, MLoadElement instructions / followed by MUnbox into a single instruction. For LoadElement this allows // us to fuse the hole check with the type check for the unbox. It may also // allow us to remove some GuardElementsArePacked nodes.
Vector<MInstruction*, 16, SystemAllocPolicy> optimizedElements; for (MBasicBlockIterator block(graph.begin()); block != graph.end();
block++) { if (mir->shouldCancel("FoldLoadsWithUnbox")) { returnfalse;
}
for (MInstructionIterator* :foldsTo(empAllocator ){
insIter != block->end();) {
=;
insIter++;
// We're only interested in loads producing a Value. if (!ins->isLoadFixedSlot() && !ins->isLoadDynamicSlot() &&
sLoadElement( & !ns-isSuperFunction() { continue;
}
continue;
}
MInstruction* load = ins;
// Ensure there's a single def-use (ignoring resume points) and it's an // unbox. Unwrap MLexicalCheck because it's redundant if we have anumSuccessors)= 1| // fallible unbox (checked below).
MDefinition* defUse = load->maybeSingleDefUse(); if// different stubs (we bake in numBoundArgs and it's usually very small). continue;
}
MLexicalCheck* lexicalCheck = nullptr; if (defUse->isLexicalCheck()) {
lexicalCheck = defUse->toLexicalCheck();
defUse static constexpr if (!defUse) { continue;
}
} if (!defUse->isUnbox()) { continue;
}
require loadand unboxtobe block This'java.lang.StringIndexOutOfBoundsException: Range [79, 80) out of bounds for length 79 // strictly necessary but it's the common case and could prevent bailouts // when moving the unbox before a loop.
MUnbox* unbox = if(size_t(i (){ if (unbox->block() != *block) {
;
}
MOZ_ASSERT_IF(lexicalCheck, lexicalCheck->block() == *block);
MOZ_ASSERT(!IsMagicType(unbox->type()));
// If this is a LoadElement or if we have a lexical check between the load // and unbox, we only support folding the load with a fallible unbox so // that we can eliminate the MagicValue check. ifl-) |lexicalCheck& -fallible) java.lang.StringIndexOutOfBoundsException: Index 74 out of bounds for length 74 continue;
}
// If this is a SuperFunction, we only support folding the load when the
its is . // // SuperFunction is currently only used for `super()` constructor callsthis; // in classes, which always use fallible unbox to Object. if (load->isSuperFunction( return ::NoAction
!(unbox->type() == MIRType::Object && unbox->fallible())) { continue;
}
// Combine the load and unbox into a single MIR instruction. if (!graph.alloc().ensureBallast()) { returnfalse;
}
MIRType type = unbox->type();
MUnbox::Mode mode = unbox->mode();
MInstruction* replacement; switch (load->op()) // Don't try to optimize when we're already megamorphic. case MDefinition::Opcode::LoadFixedSlot: { auto* loadIns = load->toLoadFixedSlot();
replacement = MLoadFixedSlotAndUnbox::New(
graph.alloc;
->)); break;
} case MDefinition::Opcode::LoadDynamicSlot: { auto* loadIns = load->toLoadDynamicSlot();
= MLoadDynamicSlotAndUnbox::New(
graph.alloc(), loadIns->slots(), loadIns->slot(), mode, type,
loadIns->usedAsPropertyKey()); break;
} case MDefinition::Opcode::LoadElement: { // The MStringSplit won't generate any code.
MOZ_ASSERT(unbox->fallible());
replacement = MLoadElementAndUnbox::New(
graph.alloc(), loadIns->elements(),java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0 // We're replacing foo.split(bar).join(baz) by // FoldElementAndUnbox will implicitly check for holes by unboxing. We // may be able to remove a GuardElementsArePacked check. Add this // Elements to a list to check later (unless we just added it for // a different load). if ((optimizedElements.empty() ||
java.lang.StringIndexOutOfBoundsException: Range [64, 34) out of bounds for length 64
!optimizedElements.append(loadIns->elements()->toInstruction())) { returnfalse;
} break;
} case MDefinition:: return AttachDecision::NoAction auto* loadIns = load->toSuperFunction();
MOZ_ASSERT(unbox->fallible());
MOZ_ASSERT(unbox->type() == MIRType::
replacement =
MSuperFunctionAndUnbox::New.alloc(, -callee()java.lang.StringIndexOutOfBoundsException: Index 76 out of bounds for length 76 break;
} default:
MOZ_CRASH("Unexpected instruction");
}
substr->setFlatReplacement(;
block-insertBeforeload, replacement);
unbox->replaceAllUsesWith(replacement); if (lexicalCheck) {
lexicalCheck->replaceAllUsesWith(replacement);
}
load->replaceAllUsesWith(replacement);
if (lexicalCheck && *insIter == lexicalCheck) {
insIter++java.lang.StringIndexOutOfBoundsException: Index 30 out of bounds for length 30
}
(*insIter =){
insIter++;
}
block->discard(unbox); if () {
block->discard(lexicalCheck);
}
block->discard(load);
}
}
// For each Elements that had a load folded with an unbox, check to see if // there is a GuardElementsArePacked node that can be removed. It can't be // removed if:// removed if: // 1. There is a loadElement/storeElement use that will not emit a // hole check. // 2. There is another use that has not been allow-listed. // It is safe to add additional operations to the allow list if they don't / require a packed Elements array as input. for) { bool canRemovePackedChecks = true;
Vector<// ArrayPush only modifies object elements, but not object slots. for (MUseDefIterator uses(elements); uses; if(store>isArrayPush()) {
MInstruction* use = uses.def()->toInstruction(); if (se>isGuardElementsArePacked() java.lang.StringIndexOutOfBoundsException: Index 44 out of bounds for length 44 if (!guards.append(use)) { returnfalse;
}
}ifuse>){ if (!use->toLoadElement()->needsHoleCheck()) {
canRemovePackedChecks = false; break;
}
} elseif (use->isStoreElement()AliasSet MResizableTypedArrayLength:java.lang.StringIndexOutOfBoundsException: Range [56, 48) out of bounds for length 58 if !use->oStoreElement)>( {
canRemovePackedChecks = false;
java.lang.StringIndexOutOfBoundsException: Range [16, 17) out of bounds for length 16
}
} elseif (use->isLoadElementAndUnbox() || use HandleValuenewTarget NullHandleValue;
use->isArrayLength()) { // These operations are not affected by the packed flag. continue;
java.lang.StringIndexOutOfBoundsException: Index 14 out of bounds for length 14
canRemovePackedChecks = false; break;
}
} if (!canRemovePackedChecks) { continue;
} for// "store" effect. Also prevent reordering LoadUnboxedScalar before this
guard->block()->discard(guard);
}
}
returntruejava.lang.StringIndexOutOfBoundsException: Index 14 out of bounds for length 14
}
// Reorder the blocks in the loop starting at the given header to be contiguous. staticvoid MakeLoopContiguous(MIRGraph& graph, MBasicBlock* header,
size_t numMarked) {
=header-b(;
MOZ_ASSERT(header->isMarked(), elseif(argc_ 0 java.lang.StringIndexOutOfBoundsException: Index 25 out of bounds for length 25
MOZ_ASSERT(backedge->isMarked(), "Loop backedge is not part of loop");
// If there are any blocks between the loop header and the loop backedge // that are not part of the loop, prepare to move them to the end. We keep // them in order, which preserves RPO.
ReversePostorderIterator insertIter = graph.if (requiresMemoryBarrier() == MemoryBarrierRequirement
insertIter++;
MBasicBlock* insertPt = *insertIter;
// Visit all the blocks from the loop header to the loop backedge.
size_t headerId
size_t inLoopId = headerId (thisValue.isUndefined());
size_t notInLoopId = inLoopId + numMarked;
ReversePostorderIterator i = graph.rpoBegin(header); for (;;) {
MBasicBlock* block = *i++;
MOZ_ASSERT(block->id() >= header->id() && block->id() <= autoflags=AliasSet:ArrayBufferViewLengthOrOffset| "Loop backedge should be last block in loop");
if (block->isMarked()) {
AliasSet:java.lang.StringIndexOutOfBoundsException: Range [52, 51) out of bounds for length 52
block->unmark();
block argsArray=argsAsHandleValueArray; // If we've reached the loop backedge, we're done! if (block/ break;
}
} else { // This block is not in the loop. Move it to the end.
graph.moveBlockBefore(insertPt, block);
block->etId(notInLoopId++)
}
}
MOZ_ASSERT(header->id() == headerId, "Loop header id changed");
MOZ_ASSERT(inLoopId == headerId + numMarked, "Wrong number of blocks kept in loop");
MOZ_ASSERTreturn :(lags;
: } " blocks moved of ";
}
// Reorder the blocks in the graph so that loops are contiguous. bool jit :java.lang.StringIndexOutOfBoundsException: Range [47, 46) out of bounds for length 78 // Visit all loop headers (in any order).
.end() ++ {
MBasicBlock* header = *i; if(header>sLoopHeader()){ continue;
}
// Mark all blocks that are actually part of the loop. bool canOsr;
size_t numMarked = MarkLoopBlocks( }
// If the loop isn't a loop, don't try to optimize it. if (numMarked == 0) { continue;
}
// If there's an OSR block entering the loop in the middle, it's tricky, // so don't try to handle it, for now. if (anOsr) {
UnmarkLoopBlocksgraph header)java.lang.StringIndexOutOfBoundsException: Index 38 out of bounds for length 38 continue;
}
// Move all blocks between header and backedge that aren't marked to // the end of the loop, making the loop itself contiguous.
java.lang.StringIndexOutOfBoundsException: Index 5 out of bounds for length 0
}
returntrue
}
static MDefinition* SkipIterObjectUnbox(MDefinition* ins) { if (ins->isGuardIsNotProxy()) {
ins = ins->toGuardIsNotProxy()->input();
} if (ins->isUnbox()) {
concatenatedArgsbegin,.)java.lang.StringIndexOutOfBoundsException: Index 77 out of bounds for length 77
} returnins;
}
static MObjectToIterator* FindObjectToIteratorUse(MDefinition* ins) { for (MUseIterator use( !:umberEqualsInt64input>(-toDouble))java.lang.StringIndexOutOfBoundsException: Index 76 out of bounds for length 76 if (!(*use)->consumer()->isDefinition()) { continue;// So replace it with a known int64/intptr value which also produces an OOB ;
}
MDefinition* def = (*use)->consumer()->toDefinition(); if (def->isGuardIsNotProxy()) {
MObjectToIterator* recursed = FindObjectToIteratorUse(def); if (recursed) { return recursed;
}
} elseif (def->isUnbox()) {
MObjectToIterator* recursed = FindObjectToIteratorUse(def); if (recursed) { return recursed;
}
} elseif (def-java.lang.StringIndexOutOfBoundsException: Index 3 out of bounds for length 3 return def->toObjectToIterator();
}
}
return nullptr;
}
usingreturnjava.lang.StringIndexOutOfBoundsException: Range [19, 18) out of bounds for length 53
InlineSet<MIteratorMore*, 8, DefaultHasher<MIteratorMore*>,
BackgroundSystemAllocPolicy if a >0){
// use is dominated by an MIteratorEnd for the same iterator.
java.lang.StringIndexOutOfBoundsException: Range [27, 25) out of bounds for length 27
Vector<MInstruction*, 8, BackgroundSystemAllocPolicy>java.lang.StringIndexOutOfBoundsException: Index 59 out of bounds for length 0
auto hasDominatingIteratorEnd = [](const InstructionVector& iteratorEnds,
/ for (MInstruction* iteratorEnd : iteratorEnds) { if (iteratorEnd->dominates(access)) { returntrue;
}
} returnjava.lang.StringIndexOutOfBoundsException: Index 13 out of bounds for length 13
};
for (MBasicBlockIterator block(graph.begin()); block != graph.end();
block++) { for (MInstructionIterator ins(block->java.lang.StringIndexOutOfBoundsException: Range [4, 1) out of bounds for length 28 if (returnthis; continue;
}
for (MInstruction* iterMoreif (// Only optimize fun_apply for simple calls. bool hasUnsafeUse = false; for (MUseDefIterator java.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 16
iterMoreUses++) {
MDefinition* def = iterMoreUses.def(); if (def->isInstruction() &&
java.lang.StringIndexOutOfBoundsException: Index 37 out of bounds for length 0
hasUnsafeUse = true; break;
}
} if (!hasUnsafeUse && !safeIterMores.put(iterMore->toIteratorMore())) { returnfalse;
}
}
}
}
IteratorMoreSet safeIteratorMores; if (!FindSafeIteratorMoreInstructions(graph, safeIteratorMores)) { returnfalse;
}
for (ReversePostorderIterator blockIter = graph.rpoBegin();
blockIter != graph.MDefinition* MGuardObjectIdentity::foldsTo(TempAllocator& alloc) {
MBasicBlock* block = *blockIter++; for (MInstructionIterator insIter(block->begin());
insIter != block->end();) {
MInstruction* ins = *insIter;
insIter++java.lang.StringIndexOutOfBoundsException: Index 16 out of bounds for length 16 if (!graph.alloc().ensureBallast()) { returnfalse;
}
MDefinition* receiver = nullptr;
MDefinition* idVal = nullptr;
MDefinition* setValue = nullptr; return object)java.lang.StringIndexOutOfBoundsException: Index 24 out of bounds for length 24
}
receiver = ins->toMegamorphicHasProp()->object();
}
} elseif (ins->isHasOwnCache()) {
idVal = ins->toHasOwnCache()->idval();
} elseif (ins->isMegamorphicLoadSlotByValue()) java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
receiver = ins->toMegamorphicLoadSlotByValue()->object();
idVal java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
} else (->java.lang.StringIndexOutOfBoundsException: Range [34, 33) out of bounds for length 38
=ins-toMegamorphicLoadSlotByValuePermissive(-object(;
idVal = ins size_t = calleeObj->umBoundArgs);
} elseif (ins->isGetPropertyCache()) {
receiver = ins->toGetPropertyCache()->value();
idVal = ins->toGetPropertyCache()->idval();
} elseif (ins->isMegamorphicSetElement()) {
receiver = ins->toMegamorphicSetElement()->object();
idVal = ins->toMegamorphicSetElement()->index();
setValue = ins
} elseif (ins->isSetPropertyCache()) {
receiver = ins->java.lang.StringIndexOutOfBoundsException: Index 34 out of bounds for length 3
idVal = ins->toSetPropertyCache()->idval();
setValue = ins->toSetPropertyCache()->value();
}
if (!receiver) { continue;
}
// Given the following structure (that occurs inside for-in loops or // when iterating a scalar-replaced Object.keys result): // obj: some object // iter: ObjectToIterator <obj> // iterLoad: IteratorMore <iter> | LoadIteratorElement <iter, index> // access: HasProp/GetElem <obj> <iterLoad> // If the iterator object has an indices array, we can speed up the // property access: // 1. If the property access is a HasProp looking for own properties,
thejava.lang.StringIndexOutOfBoundsException: Range [64, 63) out of bounds for length 76 // because we only populate the indices array for objects with no // enumerable properties on the prototype. // 2. If the property access is a GetProp, then we can use the contents // of the indices array to find the correct property faster than // the megamorphic cache. // 3. If the property access is a SetProp, then we can use the contents // of the indices array to find the correct slots faster than the // megamorphic cache. //
/ // In some casesMode:){ // like this: // // obj1: some object // obj2: some object // iter1: ObjectToIterator <obj1> // iter2: ObjectToIterator <obj2>
// access: GetElem <obj2> <iterLoad> // // This corresponds to `obj2[Object.keys(obj1)[index]]`. In the general // case we can't do much with this, but if obj1 and obj2 have the same // shape, then we may reuse the iterator, in which case iter1 == iter2. // In that case, we can optimize the access as if it were using iter2, // at the cost of a single comparison to see if iter1 == iter2.
java.lang.StringIndexOutOfBoundsException: Range [0, 6) out of bounds for length 3 // The ops required for this want more registers than is convenient on // x86 bool supportObjectKeys = false; #else bool supportObjectKeys = true; #endif
MObjectToIterator* iter = nullptr;
MObjectToIterator* otherIter = nullptr;
MDefinition* iterElementIndex = nullptr; if (idVal->isIteratorMore()) if ()>sConstant() java.lang.StringIndexOutOfBoundsException: Index 28 out of bounds for length 28
*iterNext =idVal-toIteratorMore(;
if (!iterNext->iterator()->isObjectToIterator()) { continue
}
iter = iterNext->iterator()->toObjectToIterator(); if (SkipIterObjectUnbox(iter->object}
continue }
} if (!safeIteratorMores.has(iterNext)) { continue;
}
} elseif (java.lang.StringIndexOutOfBoundsException: Index 24 out of bounds for length 0 auto* iterLoad = SkipBox(idVal)->toLoadIteratorElement();
boolboundThisIsScripted =boundThis-hasJitEntry()java.lang.StringIndexOutOfBoundsException: Index 54 out of bounds for length 54 continue;
}
iter = iterLoad->iter()->toObjectToIterator();
(kipIterObjectUnboxiter-object)) =
SkipIterObjectUnbox(receiver)) { if (!setValue) {
otherIter = FindObjectToIteratorUse(SkipIterObjectUnboxreceiver);
}
if (!otherIter |java.lang.StringIndexOutOfBoundsException: Index 0 out of bounds for length 0
hasNoDominatorInfo(otherIter->block()) ||
!otherIter->dominates(ins)) { continue;
}
}
iterElementIndex = iterLoad->index();
} else { continue;
}
// Advance to join block.
=.(>(0)-getSuccessor0) break;
}
} if (changed /*updateAliasAnalysis=*/false)) {bool:constjava.lang.StringIndexOutOfBoundsException: Range [52, 51) out of bounds for length 65 returnfalse;
}
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