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effect-control-linearizer.cc
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effect-control-linearizer.cc
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// Copyright 2015 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/compiler/effect-control-linearizer.h"
#include "include/v8-fast-api-calls.h"
#include "src/base/bits.h"
#include "src/codegen/code-factory.h"
#include "src/codegen/interface-descriptors-inl.h"
#include "src/codegen/machine-type.h"
#include "src/common/ptr-compr-inl.h"
#include "src/compiler/access-builder.h"
#include "src/compiler/compiler-source-position-table.h"
#include "src/compiler/fast-api-calls.h"
#include "src/compiler/feedback-source.h"
#include "src/compiler/graph-assembler.h"
#include "src/compiler/js-graph.h"
#include "src/compiler/js-heap-broker.h"
#include "src/compiler/linkage.h"
#include "src/compiler/node-matchers.h"
#include "src/compiler/node-origin-table.h"
#include "src/compiler/node-properties.h"
#include "src/compiler/node.h"
#include "src/compiler/schedule.h"
#include "src/heap/factory-inl.h"
#include "src/objects/heap-number.h"
#include "src/objects/oddball.h"
#include "src/objects/ordered-hash-table.h"
#include "src/objects/turbofan-types.h"
namespace v8 {
namespace internal {
namespace compiler {
enum class MaintainSchedule { kMaintain, kDiscard };
class EffectControlLinearizer {
public:
EffectControlLinearizer(JSGraph* js_graph, Schedule* schedule,
JSGraphAssembler* graph_assembler, Zone* temp_zone,
SourcePositionTable* source_positions,
NodeOriginTable* node_origins,
MaintainSchedule maintain_schedule,
JSHeapBroker* broker)
: js_graph_(js_graph),
schedule_(schedule),
temp_zone_(temp_zone),
maintain_schedule_(maintain_schedule),
source_positions_(source_positions),
node_origins_(node_origins),
broker_(broker),
graph_assembler_(graph_assembler),
frame_state_zapper_(nullptr) {}
void Run();
private:
void UpdateEffectControlForNode(Node* node);
void ProcessNode(Node* node, Node** frame_state);
bool TryWireInStateEffect(Node* node, Node* frame_state);
Node* LowerChangeBitToTagged(Node* node);
Node* LowerChangeInt31ToTaggedSigned(Node* node);
Node* LowerChangeInt32ToTagged(Node* node);
Node* LowerChangeInt64ToTagged(Node* node);
Node* LowerChangeUint32ToTagged(Node* node);
Node* LowerChangeUint64ToTagged(Node* node);
Node* LowerChangeFloat64ToTagged(Node* node);
Node* LowerChangeFloat64ToTaggedPointer(Node* node);
Node* LowerChangeTaggedSignedToInt32(Node* node);
Node* LowerChangeTaggedSignedToInt64(Node* node);
Node* LowerChangeTaggedToBit(Node* node);
Node* LowerChangeTaggedToInt32(Node* node);
Node* LowerChangeTaggedToUint32(Node* node);
Node* LowerChangeTaggedToInt64(Node* node);
Node* LowerChangeTaggedToTaggedSigned(Node* node);
Node* LowerCheckInternalizedString(Node* node, Node* frame_state);
void LowerCheckMaps(Node* node, Node* frame_state);
Node* LowerCompareMaps(Node* node);
Node* LowerCheckNumber(Node* node, Node* frame_state);
Node* LowerCheckClosure(Node* node, Node* frame_state);
Node* LowerCheckReceiver(Node* node, Node* frame_state);
Node* LowerCheckReceiverOrNullOrUndefined(Node* node, Node* frame_state);
Node* LowerCheckString(Node* node, Node* frame_state);
Node* LowerCheckBigInt(Node* node, Node* frame_state);
Node* LowerCheckedBigIntToBigInt64(Node* node, Node* frame_state);
Node* LowerCheckSymbol(Node* node, Node* frame_state);
void LowerCheckIf(Node* node, Node* frame_state);
Node* LowerCheckedInt32Add(Node* node, Node* frame_state);
Node* LowerCheckedInt32Sub(Node* node, Node* frame_state);
Node* LowerCheckedInt32Div(Node* node, Node* frame_state);
Node* LowerCheckedInt32Mod(Node* node, Node* frame_state);
Node* LowerCheckedUint32Div(Node* node, Node* frame_state);
Node* LowerCheckedUint32Mod(Node* node, Node* frame_state);
Node* LowerCheckedInt32Mul(Node* node, Node* frame_state);
Node* LowerCheckedInt64Add(Node* node, Node* frame_state);
Node* LowerCheckedInt64Sub(Node* node, Node* frame_state);
Node* LowerCheckedInt64Mul(Node* node, Node* frame_state);
Node* LowerCheckedInt64Div(Node* node, Node* frame_state);
Node* LowerCheckedInt64Mod(Node* node, Node* frame_state);
Node* LowerCheckedInt32ToTaggedSigned(Node* node, Node* frame_state);
Node* LowerCheckedInt64ToInt32(Node* node, Node* frame_state);
Node* LowerCheckedInt64ToTaggedSigned(Node* node, Node* frame_state);
Node* LowerCheckedUint32Bounds(Node* node, Node* frame_state);
Node* LowerCheckedUint32ToInt32(Node* node, Node* frame_state);
Node* LowerCheckedUint32ToTaggedSigned(Node* node, Node* frame_state);
Node* LowerCheckedUint64Bounds(Node* node, Node* frame_state);
Node* LowerCheckedUint64ToInt32(Node* node, Node* frame_state);
Node* LowerCheckedUint64ToInt64(Node* node, Node* frame_state);
Node* LowerCheckedUint64ToTaggedSigned(Node* node, Node* frame_state);
Node* LowerCheckedFloat64ToInt32(Node* node, Node* frame_state);
Node* LowerCheckedFloat64ToInt64(Node* node, Node* frame_state);
Node* LowerCheckedTaggedSignedToInt32(Node* node, Node* frame_state);
Node* LowerCheckedTaggedToArrayIndex(Node* node, Node* frame_state);
Node* LowerCheckedTaggedToInt32(Node* node, Node* frame_state);
Node* LowerCheckedTaggedToInt64(Node* node, Node* frame_state);
Node* LowerCheckedTaggedToFloat64(Node* node, Node* frame_state);
Node* LowerCheckedTaggedToTaggedSigned(Node* node, Node* frame_state);
Node* LowerCheckedTaggedToTaggedPointer(Node* node, Node* frame_state);
Node* LowerChangeInt64ToBigInt(Node* node);
Node* LowerChangeUint64ToBigInt(Node* node);
Node* LowerTruncateBigIntToWord64(Node* node);
Node* LowerChangeTaggedToFloat64(Node* node);
void TruncateTaggedPointerToBit(Node* node, GraphAssemblerLabel<1>* done);
Node* LowerTruncateTaggedToBit(Node* node);
Node* LowerTruncateTaggedPointerToBit(Node* node);
Node* LowerTruncateTaggedToFloat64(Node* node);
Node* LowerTruncateTaggedToWord32(Node* node);
Node* LowerCheckedTruncateTaggedToWord32(Node* node, Node* frame_state);
Node* LowerAllocate(Node* node);
Node* LowerNumberToString(Node* node);
Node* LowerObjectIsArrayBufferView(Node* node);
Node* LowerObjectIsBigInt(Node* node);
Node* LowerObjectIsCallable(Node* node);
Node* LowerObjectIsConstructor(Node* node);
Node* LowerObjectIsDetectableCallable(Node* node);
Node* LowerObjectIsMinusZero(Node* node);
Node* LowerNumberIsMinusZero(Node* node);
Node* LowerObjectIsNaN(Node* node);
Node* LowerNumberIsNaN(Node* node);
Node* LowerObjectIsNonCallable(Node* node);
Node* LowerObjectIsNumber(Node* node);
Node* LowerObjectIsReceiver(Node* node);
Node* LowerObjectIsSmi(Node* node);
Node* LowerObjectIsString(Node* node);
Node* LowerObjectIsSymbol(Node* node);
Node* LowerObjectIsUndetectable(Node* node);
Node* LowerNumberIsFloat64Hole(Node* node);
Node* LowerNumberIsFinite(Node* node);
Node* LowerObjectIsFiniteNumber(Node* node);
Node* LowerNumberIsInteger(Node* node);
Node* LowerObjectIsInteger(Node* node);
Node* LowerNumberIsSafeInteger(Node* node);
Node* LowerObjectIsSafeInteger(Node* node);
Node* LowerArgumentsLength(Node* node);
Node* LowerRestLength(Node* node);
Node* LowerNewDoubleElements(Node* node);
Node* LowerNewSmiOrObjectElements(Node* node);
Node* LowerNewArgumentsElements(Node* node);
Node* LowerNewConsString(Node* node);
Node* LowerSameValue(Node* node);
Node* LowerSameValueNumbersOnly(Node* node);
Node* LowerNumberSameValue(Node* node);
Node* LowerDeadValue(Node* node);
Node* LowerStringConcat(Node* node);
Node* LowerStringToNumber(Node* node);
Node* LowerStringCharCodeAt(Node* node);
Node* StringCharCodeAt(Node* receiver, Node* position);
Node* LowerStringCodePointAt(Node* node);
Node* LowerStringToLowerCaseIntl(Node* node);
Node* LowerStringToUpperCaseIntl(Node* node);
Node* LowerStringFromSingleCharCode(Node* node);
Node* LowerStringFromSingleCodePoint(Node* node);
Node* LowerStringIndexOf(Node* node);
Node* LowerStringSubstring(Node* node);
Node* LowerStringFromCodePointAt(Node* node);
Node* LowerStringLength(Node* node);
Node* LowerStringEqual(Node* node);
Node* LowerStringLessThan(Node* node);
Node* LowerStringLessThanOrEqual(Node* node);
Node* LowerBigIntAdd(Node* node, Node* frame_state);
Node* LowerBigIntSubtract(Node* node, Node* frame_state);
Node* LowerBigIntMultiply(Node* node, Node* frame_state);
Node* LowerBigIntDivide(Node* node, Node* frame_state);
Node* LowerBigIntModulus(Node* node, Node* frame_state);
Node* LowerBigIntBitwiseAnd(Node* node, Node* frame_state);
Node* LowerBigIntNegate(Node* node);
Node* LowerCheckFloat64Hole(Node* node, Node* frame_state);
Node* LowerCheckNotTaggedHole(Node* node, Node* frame_state);
Node* LowerConvertTaggedHoleToUndefined(Node* node);
void LowerCheckEqualsInternalizedString(Node* node, Node* frame_state);
void LowerCheckEqualsSymbol(Node* node, Node* frame_state);
Node* LowerTypeOf(Node* node);
Node* LowerToBoolean(Node* node);
Node* LowerPlainPrimitiveToNumber(Node* node);
Node* LowerPlainPrimitiveToWord32(Node* node);
Node* LowerPlainPrimitiveToFloat64(Node* node);
Node* LowerEnsureWritableFastElements(Node* node);
Node* LowerMaybeGrowFastElements(Node* node, Node* frame_state);
void LowerTransitionElementsKind(Node* node);
Node* LowerLoadFieldByIndex(Node* node);
Node* LowerLoadMessage(Node* node);
Node* AdaptFastCallTypedArrayArgument(Node* node,
ElementsKind expected_elements_kind,
GraphAssemblerLabel<0>* bailout);
Node* AdaptFastCallArgument(Node* node, CTypeInfo arg_type,
GraphAssemblerLabel<0>* if_error);
Node* ClampFastCallArgument(Node* input, CTypeInfo::Type scalar_type);
struct AdaptOverloadedFastCallResult {
Node* target_address;
Node* argument;
};
AdaptOverloadedFastCallResult AdaptOverloadedFastCallArgument(
Node* node, const FastApiCallFunctionVector& c_functions,
const fast_api_call::OverloadsResolutionResult&
overloads_resolution_result,
GraphAssemblerLabel<0>* if_error);
Node* WrapFastCall(const CallDescriptor* call_descriptor, int inputs_size,
Node** inputs, Node* target,
const CFunctionInfo* c_signature, int c_arg_count,
Node* stack_slot);
Node* GenerateSlowApiCall(Node* node);
Node* LowerFastApiCall(Node* node);
Node* LowerLoadTypedElement(Node* node);
Node* LowerLoadDataViewElement(Node* node);
Node* LowerLoadStackArgument(Node* node);
void LowerStoreMessage(Node* node);
void LowerStoreTypedElement(Node* node);
void LowerStoreDataViewElement(Node* node);
void LowerStoreSignedSmallElement(Node* node);
Node* LowerFindOrderedHashMapEntry(Node* node);
Node* LowerFindOrderedHashMapEntryForInt32Key(Node* node);
Node* LowerFindOrderedHashSetEntry(Node* node);
void LowerTransitionAndStoreElement(Node* node);
void LowerTransitionAndStoreNumberElement(Node* node);
void LowerTransitionAndStoreNonNumberElement(Node* node);
void LowerRuntimeAbort(Node* node);
Node* LowerAssertType(Node* node);
Node* LowerFoldConstant(Node* node);
Node* LowerConvertReceiver(Node* node);
Node* LowerDateNow(Node* node);
Node* LowerDoubleArrayMinMax(Node* node);
// Lowering of optional operators.
Maybe<Node*> LowerFloat64RoundUp(Node* node);
Maybe<Node*> LowerFloat64RoundDown(Node* node);
Maybe<Node*> LowerFloat64RoundTiesEven(Node* node);
Maybe<Node*> LowerFloat64RoundTruncate(Node* node);
Node* AllocateHeapNumberWithValue(Node* node);
Node* BuildCheckedFloat64ToInt32(CheckForMinusZeroMode mode,
const FeedbackSource& feedback, Node* value,
Node* frame_state);
Node* BuildCheckedFloat64ToInt64(CheckForMinusZeroMode mode,
const FeedbackSource& feedback, Node* value,
Node* frame_state);
Node* BuildCheckedFloat64ToIndex(const FeedbackSource& feedback, Node* value,
Node* frame_state);
Node* BuildCheckedHeapNumberOrOddballToFloat64(CheckTaggedInputMode mode,
const FeedbackSource& feedback,
Node* value,
Node* frame_state);
Node* BuildReverseBytes(ExternalArrayType type, Node* value);
Node* BuildFloat64RoundDown(Node* value);
Node* BuildFloat64RoundTruncate(Node* input);
template <size_t VarCount, size_t VarCount2>
void SmiTagOrOverflow(Node* value, GraphAssemblerLabel<VarCount>* if_overflow,
GraphAssemblerLabel<VarCount2>* done);
Node* SmiTagOrDeopt(Node* value, const CheckParameters& params,
Node* frame_state);
Node* BuildUint32Mod(Node* lhs, Node* rhs);
Node* ComputeUnseededHash(Node* value);
Node* LowerStringComparison(Callable const& callable, Node* node);
Node* IsElementsKindGreaterThan(Node* kind, ElementsKind reference_kind);
Node* BuildTypedArrayDataPointer(Node* base, Node* external);
template <typename... Args>
Node* CallBuiltin(Builtin builtin, Operator::Properties properties, Args...);
Node* ChangeBitToTagged(Node* value);
Node* ChangeFloat64ToTagged(Node* value, CheckForMinusZeroMode mode);
Node* ChangeInt32ToSmi(Node* value);
// In pointer compression, we smi-corrupt. This means the upper bits of a Smi
// are not important. ChangeTaggedInt32ToSmi has a known tagged int32 as input
// and takes advantage of the smi corruption by emitting a Bitcast node
// instead of a Change node in order to save instructions.
// In non pointer compression, it behaves like ChangeInt32ToSmi.
Node* ChangeTaggedInt32ToSmi(Node* value);
Node* ChangeInt32ToIntPtr(Node* value);
Node* ChangeInt32ToTagged(Node* value);
Node* ChangeInt64ToSmi(Node* value);
Node* ChangeIntPtrToInt32(Node* value);
Node* ChangeIntPtrToSmi(Node* value);
Node* ChangeUint32ToUintPtr(Node* value);
Node* ChangeUint32ToSmi(Node* value);
Node* ChangeUint32ToTagged(Node* value);
Node* ChangeSmiToIntPtr(Node* value);
Node* ChangeSmiToInt32(Node* value);
Node* ChangeSmiToInt64(Node* value);
Node* ObjectIsSmi(Node* value);
Node* LoadFromSeqString(Node* receiver, Node* position, Node* is_one_byte);
Node* TruncateWordToInt32(Node* value);
Node* MakeWeakForComparison(Node* heap_object);
Node* BuildIsWeakReferenceTo(Node* maybe_object, Node* value);
Node* BuildIsClearedWeakReference(Node* maybe_object);
Node* BuildIsStrongReference(Node* value);
Node* BuildStrongReferenceFromWeakReference(Node* value);
Node* SmiMaxValueConstant();
Node* SmiShiftBitsConstant();
// Pass {bitfield} = {digit} = nullptr to construct the canoncial 0n BigInt.
Node* BuildAllocateBigInt(Node* bitfield, Node* digit);
void TransitionElementsTo(Node* node, Node* array, ElementsKind from,
ElementsKind to);
// This function tries to migrate |value| if its map |value_map| is
// deprecated. It deopts, if either |value_map| isn't deprecated or migration
// fails.
void MigrateInstanceOrDeopt(Node* value, Node* value_map, Node* frame_state,
FeedbackSource const& feedback_source,
DeoptimizeReason reason);
// Tries to migrate |value| if its map |value_map| is deprecated, but doesn't
// deopt on failure.
void TryMigrateInstance(Node* value, Node* value_map);
bool should_maintain_schedule() const {
return maintain_schedule_ == MaintainSchedule::kMaintain;
}
Factory* factory() const { return isolate()->factory(); }
Isolate* isolate() const { return jsgraph()->isolate(); }
JSGraph* jsgraph() const { return js_graph_; }
Graph* graph() const { return js_graph_->graph(); }
Schedule* schedule() const { return schedule_; }
Zone* temp_zone() const { return temp_zone_; }
CommonOperatorBuilder* common() const { return js_graph_->common(); }
SimplifiedOperatorBuilder* simplified() const {
return js_graph_->simplified();
}
MachineOperatorBuilder* machine() const { return js_graph_->machine(); }
JSGraphAssembler* gasm() const { return graph_assembler_; }
JSHeapBroker* broker() const { return broker_; }
JSGraph* js_graph_;
Schedule* schedule_;
Zone* temp_zone_;
MaintainSchedule maintain_schedule_;
RegionObservability region_observability_ = RegionObservability::kObservable;
bool inside_region_ = false;
SourcePositionTable* source_positions_;
NodeOriginTable* node_origins_;
JSHeapBroker* broker_;
JSGraphAssembler* graph_assembler_;
Node* frame_state_zapper_; // For tracking down compiler::Node::New crashes.
};
namespace {
struct BlockEffectControlData {
Node* current_effect = nullptr; // New effect.
Node* current_control = nullptr; // New control.
Node* current_frame_state = nullptr; // New frame state.
};
class BlockEffectControlMap {
public:
explicit BlockEffectControlMap(Zone* temp_zone) : map_(temp_zone) {}
BlockEffectControlData& For(BasicBlock* from, BasicBlock* to) {
return map_[std::make_pair(from->id().ToInt(), to->id().ToInt())];
}
const BlockEffectControlData& For(BasicBlock* from, BasicBlock* to) const {
return map_.at(std::make_pair(from->id().ToInt(), to->id().ToInt()));
}
private:
using Key = std::pair<int32_t, int32_t>;
using Map = ZoneMap<Key, BlockEffectControlData>;
Map map_;
};
// Effect phis that need to be updated after the first pass.
struct PendingEffectPhi {
Node* effect_phi;
BasicBlock* block;
PendingEffectPhi(Node* effect_phi, BasicBlock* block)
: effect_phi(effect_phi), block(block) {}
};
void UpdateEffectPhi(Node* node, BasicBlock* block,
BlockEffectControlMap* block_effects) {
// Update all inputs to an effect phi with the effects from the given
// block->effect map.
DCHECK_EQ(IrOpcode::kEffectPhi, node->opcode());
DCHECK_EQ(static_cast<size_t>(node->op()->EffectInputCount()),
block->PredecessorCount());
for (int i = 0; i < node->op()->EffectInputCount(); i++) {
Node* input = node->InputAt(i);
BasicBlock* predecessor = block->PredecessorAt(static_cast<size_t>(i));
const BlockEffectControlData& block_effect =
block_effects->For(predecessor, block);
Node* effect = block_effect.current_effect;
if (input != effect) {
node->ReplaceInput(i, effect);
}
}
}
void UpdateBlockControl(BasicBlock* block,
BlockEffectControlMap* block_effects) {
Node* control = block->NodeAt(0);
DCHECK(NodeProperties::IsControl(control));
// Do not rewire the end node.
if (control->opcode() == IrOpcode::kEnd) return;
// Update all inputs to the given control node with the correct control.
DCHECK(control->opcode() == IrOpcode::kMerge ||
static_cast<size_t>(control->op()->ControlInputCount()) ==
block->PredecessorCount());
if (static_cast<size_t>(control->op()->ControlInputCount()) !=
block->PredecessorCount()) {
return; // We already re-wired the control inputs of this node.
}
for (int i = 0; i < control->op()->ControlInputCount(); i++) {
Node* input = NodeProperties::GetControlInput(control, i);
BasicBlock* predecessor = block->PredecessorAt(static_cast<size_t>(i));
const BlockEffectControlData& block_effect =
block_effects->For(predecessor, block);
if (input != block_effect.current_control) {
NodeProperties::ReplaceControlInput(control, block_effect.current_control,
i);
}
}
}
void RemoveRenameNode(Node* node) {
DCHECK(IrOpcode::kFinishRegion == node->opcode() ||
IrOpcode::kBeginRegion == node->opcode() ||
IrOpcode::kTypeGuard == node->opcode());
// Update the value/context uses to the value input of the finish node and
// the effect uses to the effect input.
for (Edge edge : node->use_edges()) {
DCHECK(!edge.from()->IsDead());
if (NodeProperties::IsEffectEdge(edge)) {
edge.UpdateTo(NodeProperties::GetEffectInput(node));
} else {
DCHECK(!NodeProperties::IsControlEdge(edge));
DCHECK(!NodeProperties::IsFrameStateEdge(edge));
edge.UpdateTo(node->InputAt(0));
}
}
node->Kill();
}
void TryCloneBranch(Node* node, BasicBlock* block, Zone* temp_zone,
Graph* graph, CommonOperatorBuilder* common,
BlockEffectControlMap* block_effects,
SourcePositionTable* source_positions,
NodeOriginTable* node_origins) {
DCHECK_EQ(IrOpcode::kBranch, node->opcode());
// This optimization is a special case of (super)block cloning. It takes an
// input graph as shown below and clones the Branch node for every predecessor
// to the Merge, essentially removing the Merge completely. This avoids
// materializing the bit for the Phi and may offer potential for further
// branch folding optimizations (i.e. because one or more inputs to the Phi is
// a constant). Note that there may be more Phi nodes hanging off the Merge,
// but we can only a certain subset of them currently (actually only Phi and
// EffectPhi nodes whose uses have either the IfTrue or IfFalse as control
// input).
// Control1 ... ControlN
// ^ ^
// | | Cond1 ... CondN
// +----+ +----+ ^ ^
// | | | |
// | | +----+ |
// Merge<--+ | +------------+
// ^ \|/
// | Phi
// | |
// Branch----+
// ^
// |
// +-----+-----+
// | |
// IfTrue IfFalse
// ^ ^
// | |
// The resulting graph (modulo the Phi and EffectPhi nodes) looks like this:
// Control1 Cond1 ... ControlN CondN
// ^ ^ ^ ^
// \ / \ /
// Branch ... Branch
// ^ ^
// | |
// +---+---+ +---+----+
// | | | |
// IfTrue IfFalse ... IfTrue IfFalse
// ^ ^ ^ ^
// | | | |
// +--+ +-------------+ |
// | | +--------------+ +--+
// | | | |
// Merge Merge
// ^ ^
// | |
SourcePositionTable::Scope scope(source_positions,
source_positions->GetSourcePosition(node));
NodeOriginTable::Scope origin_scope(node_origins, "clone branch", node);
Node* branch = node;
Node* cond = NodeProperties::GetValueInput(branch, 0);
if (!cond->OwnedBy(branch) || cond->opcode() != IrOpcode::kPhi) return;
Node* merge = NodeProperties::GetControlInput(branch);
if (merge->opcode() != IrOpcode::kMerge ||
NodeProperties::GetControlInput(cond) != merge) {
return;
}
// Grab the IfTrue/IfFalse projections of the Branch.
BranchMatcher matcher(branch);
// Check/collect other Phi/EffectPhi nodes hanging off the Merge.
NodeVector phis(temp_zone);
for (Node* const use : merge->uses()) {
if (use == branch || use == cond) continue;
// We cannot currently deal with non-Phi/EffectPhi nodes hanging off the
// Merge. Ideally, we would just clone the nodes (and everything that
// depends on it to some distant join point), but that requires knowledge
// about dominance/post-dominance.
if (!NodeProperties::IsPhi(use)) return;
for (Edge edge : use->use_edges()) {
// Right now we can only handle Phi/EffectPhi nodes whose uses are
// directly control-dependend on either the IfTrue or the IfFalse
// successor, because we know exactly how to update those uses.
if (edge.from()->op()->ControlInputCount() != 1) return;
Node* control = NodeProperties::GetControlInput(edge.from());
if (NodeProperties::IsPhi(edge.from())) {
control = NodeProperties::GetControlInput(control, edge.index());
}
if (control != matcher.IfTrue() && control != matcher.IfFalse()) return;
}
phis.push_back(use);
}
BranchHint const hint = BranchHintOf(branch->op());
int const input_count = merge->op()->ControlInputCount();
DCHECK_LE(1, input_count);
Node** const inputs = graph->zone()->NewArray<Node*>(2 * input_count);
Node** const merge_true_inputs = &inputs[0];
Node** const merge_false_inputs = &inputs[input_count];
for (int index = 0; index < input_count; ++index) {
Node* cond1 = NodeProperties::GetValueInput(cond, index);
Node* control1 = NodeProperties::GetControlInput(merge, index);
Node* branch1 = graph->NewNode(common->Branch(hint), cond1, control1);
merge_true_inputs[index] = graph->NewNode(common->IfTrue(), branch1);
merge_false_inputs[index] = graph->NewNode(common->IfFalse(), branch1);
}
Node* const merge_true = matcher.IfTrue();
Node* const merge_false = matcher.IfFalse();
merge_true->TrimInputCount(0);
merge_false->TrimInputCount(0);
for (int i = 0; i < input_count; ++i) {
merge_true->AppendInput(graph->zone(), merge_true_inputs[i]);
merge_false->AppendInput(graph->zone(), merge_false_inputs[i]);
}
DCHECK_EQ(2u, block->SuccessorCount());
NodeProperties::ChangeOp(matcher.IfTrue(), common->Merge(input_count));
NodeProperties::ChangeOp(matcher.IfFalse(), common->Merge(input_count));
int const true_index =
block->SuccessorAt(0)->NodeAt(0) == matcher.IfTrue() ? 0 : 1;
BlockEffectControlData* true_block_data =
&block_effects->For(block, block->SuccessorAt(true_index));
BlockEffectControlData* false_block_data =
&block_effects->For(block, block->SuccessorAt(true_index ^ 1));
for (Node* const phi : phis) {
for (int index = 0; index < input_count; ++index) {
inputs[index] = phi->InputAt(index);
}
inputs[input_count] = merge_true;
Node* phi_true = graph->NewNode(phi->op(), input_count + 1, inputs);
inputs[input_count] = merge_false;
Node* phi_false = graph->NewNode(phi->op(), input_count + 1, inputs);
if (phi->UseCount() == 0) {
DCHECK_EQ(phi->opcode(), IrOpcode::kEffectPhi);
} else {
for (Edge edge : phi->use_edges()) {
Node* control = NodeProperties::GetControlInput(edge.from());
if (NodeProperties::IsPhi(edge.from())) {
control = NodeProperties::GetControlInput(control, edge.index());
}
DCHECK(control == matcher.IfTrue() || control == matcher.IfFalse());
edge.UpdateTo((control == matcher.IfTrue()) ? phi_true : phi_false);
}
}
if (phi->opcode() == IrOpcode::kEffectPhi) {
true_block_data->current_effect = phi_true;
false_block_data->current_effect = phi_false;
}
phi->Kill();
}
// Fix up IfTrue and IfFalse and kill all dead nodes.
if (branch == block->control_input()) {
true_block_data->current_control = merge_true;
false_block_data->current_control = merge_false;
}
branch->Kill();
cond->Kill();
merge->Kill();
}
} // namespace
void EffectControlLinearizer::Run() {
BlockEffectControlMap block_effects(temp_zone());
ZoneVector<PendingEffectPhi> pending_effect_phis(temp_zone());
ZoneVector<BasicBlock*> pending_block_controls(temp_zone());
NodeVector inputs_buffer(temp_zone());
// TODO(rmcilroy) We should not depend on having rpo_order on schedule, and
// instead just do our own RPO walk here.
for (BasicBlock* block : *(schedule()->rpo_order())) {
if (block != schedule()->start() && block->PredecessorCount() == 0) {
// Block has been removed from the schedule by a preceeding unreachable
// node, just skip it.
continue;
}
gasm()->Reset();
BasicBlock::iterator instr = block->begin();
BasicBlock::iterator end_instr = block->end();
// The control node should be the first.
Node* control = *instr;
gasm()->AddNode(control);
DCHECK(NodeProperties::IsControl(control));
bool has_incoming_backedge = IrOpcode::kLoop == control->opcode();
// Update the control inputs.
if (has_incoming_backedge) {
// If there are back edges, we need to update later because we have not
// computed the control yet.
pending_block_controls.push_back(block);
} else {
// If there are no back edges, we can update now.
UpdateBlockControl(block, &block_effects);
}
instr++;
// Iterate over the phis and update the effect phis.
Node* effect_phi = nullptr;
Node* terminate = nullptr;
for (; instr != end_instr; instr++) {
Node* node = *instr;
// Only go through the phis and effect phis.
if (node->opcode() == IrOpcode::kEffectPhi) {
// There should be at most one effect phi in a block.
DCHECK_NULL(effect_phi);
// IfException blocks should not have effect phis.
DCHECK_NE(IrOpcode::kIfException, control->opcode());
effect_phi = node;
} else if (node->opcode() == IrOpcode::kPhi) {
// Just skip phis.
} else if (node->opcode() == IrOpcode::kTerminate) {
DCHECK_NULL(terminate);
terminate = node;
} else {
break;
}
gasm()->AddNode(node);
}
if (effect_phi) {
// Make sure we update the inputs to the incoming blocks' effects.
if (has_incoming_backedge) {
// In case of loops, we do not update the effect phi immediately
// because the back predecessor has not been handled yet. We just
// record the effect phi for later processing.
pending_effect_phis.push_back(PendingEffectPhi(effect_phi, block));
} else {
UpdateEffectPhi(effect_phi, block, &block_effects);
}
}
Node* effect = effect_phi;
if (effect == nullptr) {
// There was no effect phi.
if (block == schedule()->start()) {
// Start block => effect is start.
DCHECK_EQ(graph()->start(), control);
effect = graph()->start();
} else if (control->opcode() == IrOpcode::kEnd) {
// End block is just a dummy, no effect needed.
DCHECK_EQ(BasicBlock::kNone, block->control());
DCHECK_EQ(1u, block->size());
effect = nullptr;
} else {
// If all the predecessors have the same effect, we can use it as our
// current effect.
for (size_t i = 0; i < block->PredecessorCount(); ++i) {
const BlockEffectControlData& data =
block_effects.For(block->PredecessorAt(i), block);
if (!effect) effect = data.current_effect;
if (data.current_effect != effect) {
effect = nullptr;
break;
}
}
if (effect == nullptr) {
DCHECK_NE(IrOpcode::kIfException, control->opcode());
// The input blocks do not have the same effect. We have
// to create an effect phi node.
inputs_buffer.clear();
inputs_buffer.resize(block->PredecessorCount(), jsgraph()->Dead());
inputs_buffer.push_back(control);
effect = graph()->NewNode(
common()->EffectPhi(static_cast<int>(block->PredecessorCount())),
static_cast<int>(inputs_buffer.size()), &(inputs_buffer.front()));
gasm()->AddNode(effect);
// For loops, we update the effect phi node later to break cycles.
if (control->opcode() == IrOpcode::kLoop) {
pending_effect_phis.push_back(PendingEffectPhi(effect, block));
} else {
UpdateEffectPhi(effect, block, &block_effects);
}
} else if (control->opcode() == IrOpcode::kIfException) {
// The IfException is connected into the effect chain, so we need
// to update the effect here.
NodeProperties::ReplaceEffectInput(control, effect);
effect = control;
}
}
}
// Fixup the Terminate node.
if (terminate != nullptr) {
NodeProperties::ReplaceEffectInput(terminate, effect);
}
// The frame state at block entry is determined by the frame states leaving
// all predecessors. In case there is no frame state dominating this block,
// we can rely on a checkpoint being present before the next deoptimization.
Node* frame_state = nullptr;
if (block != schedule()->start()) {
// If all the predecessors have the same effect, we can use it
// as our current effect.
frame_state =
block_effects.For(block->PredecessorAt(0), block).current_frame_state;
for (size_t i = 1; i < block->PredecessorCount(); i++) {
if (block_effects.For(block->PredecessorAt(i), block)
.current_frame_state != frame_state) {
frame_state = nullptr;
frame_state_zapper_ = graph()->end();
break;
}
}
}
gasm()->InitializeEffectControl(effect, control);
// Process the ordinary instructions.
for (; instr != end_instr; instr++) {
Node* node = *instr;
ProcessNode(node, &frame_state);
}
switch (block->control()) {
case BasicBlock::kGoto:
case BasicBlock::kNone:
break;
case BasicBlock::kCall:
case BasicBlock::kTailCall:
case BasicBlock::kSwitch:
case BasicBlock::kReturn:
case BasicBlock::kDeoptimize:
case BasicBlock::kThrow:
case BasicBlock::kBranch:
UpdateEffectControlForNode(block->control_input());
gasm()->UpdateEffectControlWith(block->control_input());
break;
}
if (!should_maintain_schedule() &&
block->control() == BasicBlock::kBranch) {
TryCloneBranch(block->control_input(), block, temp_zone(), graph(),
common(), &block_effects, source_positions_,
node_origins_);
}
// Store the effect, control and frame state for later use.
for (BasicBlock* successor : block->successors()) {
BlockEffectControlData* data = &block_effects.For(block, successor);
if (data->current_effect == nullptr) {
data->current_effect = gasm()->effect();
}
if (data->current_control == nullptr) {
data->current_control = gasm()->control();
}
data->current_frame_state = frame_state;
}
}
for (BasicBlock* pending_block_control : pending_block_controls) {
UpdateBlockControl(pending_block_control, &block_effects);
}
// Update the incoming edges of the effect phis that could not be processed
// during the first pass (because they could have incoming back edges).
for (const PendingEffectPhi& pending_effect_phi : pending_effect_phis) {
UpdateEffectPhi(pending_effect_phi.effect_phi, pending_effect_phi.block,
&block_effects);
}
schedule_->rpo_order()->clear();
}
void EffectControlLinearizer::UpdateEffectControlForNode(Node* node) {
// If the node takes an effect, replace with the current one.
if (node->op()->EffectInputCount() > 0) {
DCHECK_EQ(1, node->op()->EffectInputCount());
NodeProperties::ReplaceEffectInput(node, gasm()->effect());
} else {
// New effect chain is only started with a Start or ValueEffect node.
DCHECK(node->op()->EffectOutputCount() == 0 ||
node->opcode() == IrOpcode::kStart);
}
// Rewire control inputs.
for (int i = 0; i < node->op()->ControlInputCount(); i++) {
NodeProperties::ReplaceControlInput(node, gasm()->control(), i);
}
}
void EffectControlLinearizer::ProcessNode(Node* node, Node** frame_state) {
SourcePositionTable::Scope scope(source_positions_,
source_positions_->GetSourcePosition(node));
NodeOriginTable::Scope origin_scope(node_origins_, "process node", node);
// If basic block is unreachable after this point, update the node's effect
// and control inputs to mark it as dead, but don't process further.
if (gasm()->effect() == jsgraph()->Dead()) {
UpdateEffectControlForNode(node);
return;
}
// If the node needs to be wired into the effect/control chain, do this
// here. Pass current frame state for lowering to eager deoptimization.
if (TryWireInStateEffect(node, *frame_state)) {
return;
}
// If the node has a visible effect, then there must be a checkpoint in the
// effect chain before we are allowed to place another eager deoptimization
// point. We zap the frame state to ensure this invariant is maintained.
if (region_observability_ == RegionObservability::kObservable &&
!node->op()->HasProperty(Operator::kNoWrite)) {
*frame_state = nullptr;
frame_state_zapper_ = node;
}
// Remove the end markers of 'atomic' allocation region because the
// region should be wired-in now.
if (node->opcode() == IrOpcode::kFinishRegion) {
// Reset the current region observability.
region_observability_ = RegionObservability::kObservable;
inside_region_ = false;
// Update the value uses to the value input of the finish node and
// the effect uses to the effect input.
return RemoveRenameNode(node);
}
if (node->opcode() == IrOpcode::kBeginRegion) {
// Determine the observability for this region and use that for all
// nodes inside the region (i.e. ignore the absence of kNoWrite on
// StoreField and other operators).
DCHECK_NE(RegionObservability::kNotObservable, region_observability_);
region_observability_ = RegionObservabilityOf(node->op());
inside_region_ = true;
// Update the value uses to the value input of the finish node and
// the effect uses to the effect input.
return RemoveRenameNode(node);
}
if (node->opcode() == IrOpcode::kTypeGuard) {
return RemoveRenameNode(node);
}
// Special treatment for checkpoint nodes.
if (node->opcode() == IrOpcode::kCheckpoint) {
// Unlink the check point; effect uses will be updated to the incoming
// effect that is passed. The frame state is preserved for lowering.
DCHECK_EQ(RegionObservability::kObservable, region_observability_);
*frame_state = NodeProperties::GetFrameStateInput(node);
return;
}
if (node->opcode() == IrOpcode::kStoreField) {
// Mark stores outside a region as non-initializing and non-transitioning.
if (!inside_region_) {
const FieldAccess access = FieldAccessOf(node->op());
NodeProperties::ChangeOp(node, simplified()->StoreField(access, false));
}
}
// The IfSuccess nodes should always start a basic block (and basic block
// start nodes are not handled in the ProcessNode method).
DCHECK_NE(IrOpcode::kIfSuccess, node->opcode());
UpdateEffectControlForNode(node);
gasm()->AddNode(node);
if (node->opcode() == IrOpcode::kUnreachable) {
// Break the effect chain on {Unreachable} and reconnect to the graph end.
// Mark the following code for deletion by connecting to the {Dead} node.
gasm()->ConnectUnreachableToEnd();
}
}
bool EffectControlLinearizer::TryWireInStateEffect(Node* node,
Node* frame_state) {
Node* result = nullptr;
switch (node->opcode()) {
case IrOpcode::kChangeBitToTagged:
result = LowerChangeBitToTagged(node);
break;
case IrOpcode::kChangeInt31ToTaggedSigned:
result = LowerChangeInt31ToTaggedSigned(node);
break;
case IrOpcode::kChangeInt32ToTagged:
result = LowerChangeInt32ToTagged(node);
break;
case IrOpcode::kChangeInt64ToTagged:
result = LowerChangeInt64ToTagged(node);
break;
case IrOpcode::kChangeUint32ToTagged:
result = LowerChangeUint32ToTagged(node);
break;
case IrOpcode::kChangeUint64ToTagged:
result = LowerChangeUint64ToTagged(node);
break;
case IrOpcode::kChangeFloat64ToTagged:
result = LowerChangeFloat64ToTagged(node);
break;
case IrOpcode::kChangeFloat64ToTaggedPointer:
result = LowerChangeFloat64ToTaggedPointer(node);
break;
case IrOpcode::kChangeTaggedSignedToInt32:
result = LowerChangeTaggedSignedToInt32(node);
break;
case IrOpcode::kChangeTaggedSignedToInt64:
result = LowerChangeTaggedSignedToInt64(node);
break;
case IrOpcode::kChangeTaggedToBit:
result = LowerChangeTaggedToBit(node);
break;
case IrOpcode::kChangeTaggedToInt32:
result = LowerChangeTaggedToInt32(node);
break;
case IrOpcode::kChangeTaggedToUint32:
result = LowerChangeTaggedToUint32(node);
break;
case IrOpcode::kChangeTaggedToInt64:
result = LowerChangeTaggedToInt64(node);
break;
case IrOpcode::kChangeTaggedToFloat64:
result = LowerChangeTaggedToFloat64(node);
break;
case IrOpcode::kChangeTaggedToTaggedSigned:
result = LowerChangeTaggedToTaggedSigned(node);
break;
case IrOpcode::kTruncateTaggedToBit:
result = LowerTruncateTaggedToBit(node);
break;
case IrOpcode::kTruncateTaggedPointerToBit:
result = LowerTruncateTaggedPointerToBit(node);
break;
case IrOpcode::kTruncateTaggedToFloat64:
result = LowerTruncateTaggedToFloat64(node);
break;
case IrOpcode::kCheckClosure:
result = LowerCheckClosure(node, frame_state);
break;
case IrOpcode::kCheckMaps:
LowerCheckMaps(node, frame_state);
break;
case IrOpcode::kCompareMaps:
result = LowerCompareMaps(node);
break;
case IrOpcode::kCheckNumber:
result = LowerCheckNumber(node, frame_state);
break;
case IrOpcode::kCheckReceiver: