dart::AssertAssignableInstr Class Reference

#include <il.h>

Inheritance diagram for dart::AssertAssignableInstr:

Public Types
enum	Kind { FOR_EACH_ASSERT_ASSIGNABLE_KIND =(KIND_DEFN) }
enum	{   kInstancePos = 0 , kDstTypePos = 1 , kInstantiatorTAVPos = 2 , kFunctionTAVPos = 3 ,   kNumInputs = 4 }
Public Types inherited from dart::TemplateDefinition< 4, Throws, Pure >
using	BaseClass = typename Pure< Definition, PureDefinition >::Base

Public Member Functions
	AssertAssignableInstr (const InstructionSource &source, Value *value, Value *dst_type, Value *instantiator_type_arguments, Value *function_type_arguments, const String &dst_name, intptr_t deopt_id, Kind kind=kUnknown)
virtual intptr_t	statistics_tag () const
virtual CompileType	ComputeType () const
virtual bool	RecomputeType ()
Value *	value () const
Value *	dst_type () const
Value *	instantiator_type_arguments () const
Value *	function_type_arguments () const
virtual TokenPosition	token_pos () const
const String &	dst_name () const
virtual bool	ComputeCanDeoptimize () const
virtual bool	ComputeCanDeoptimizeAfterCall () const
virtual intptr_t	NumberOfInputsConsumedBeforeCall () const
virtual bool	CanBecomeDeoptimizationTarget () const
virtual Definition *	Canonicalize (FlowGraph *flow_graph)
virtual bool	AttributesEqual (const Instruction &other) const
virtual Value *	RedefinedValue () const
virtual void	InferRange (RangeAnalysis *analysis, Range *range)
Public Member Functions inherited from dart::TemplateDefinition< 4, Throws, Pure >
	TemplateDefinition (intptr_t deopt_id=DeoptId::kNone)
	TemplateDefinition (const InstructionSource &source, intptr_t deopt_id=DeoptId::kNone)
virtual intptr_t	InputCount () const
virtual Value *	InputAt (intptr_t i) const
virtual bool	MayThrow () const

Static Public Member Functions
static const char *	KindToCString (Kind kind)
static bool	ParseKind (const char *str, Kind *out)

Additional Inherited Members
Protected Attributes inherited from dart::TemplateDefinition< 4, Throws, Pure >
EmbeddedArray< Value *, N >	inputs_

Detailed Description

Definition at line 4356 of file il.h.

Member Enumeration Documentation

anonymous enum

anonymous enum

Enumerator
kInstancePos
kDstTypePos
kInstantiatorTAVPos
kFunctionTAVPos
kNumInputs

Definition at line 4371 of file il.h.

       {
    kInstancePos = 0,
    kDstTypePos = 1,
    kInstantiatorTAVPos = 2,
    kFunctionTAVPos = 3,
    kNumInputs = 4,
  };

Kind

enum dart::AssertAssignableInstr::Kind

Enumerator
FOR_EACH_ASSERT_ASSIGNABLE_KIND

Definition at line 4365 of file il.h.

{ FOR_EACH_ASSERT_ASSIGNABLE_KIND(KIND_DEFN) };

Constructor & Destructor Documentation

AssertAssignableInstr()

dart::AssertAssignableInstr::AssertAssignableInstr ( const InstructionSource &  source, Value *  value, Value *  dst_type, Value *  instantiator_type_arguments, Value *  function_type_arguments, const String &  dst_name, intptr_t  deopt_id, Kind  kind = kUnknown  )

inline

Definition at line 4379 of file il.h.

      : TemplateDefinition(source, deopt_id),
        token_pos_(source.token_pos),
        dst_name_(dst_name),
        kind_(kind) {
    ASSERT(!dst_name.IsNull());
    SetInputAt(kInstancePos, value);
    SetInputAt(kDstTypePos, dst_type);
    SetInputAt(kInstantiatorTAVPos, instantiator_type_arguments);
    SetInputAt(kFunctionTAVPos, function_type_arguments);
  }

Member Function Documentation

AttributesEqual()

virtual bool dart::AssertAssignableInstr::AttributesEqual ( const Instruction &  other ) const

inlinevirtual

Definition at line 4438 of file il.h.

{ return true; }

CanBecomeDeoptimizationTarget()

virtual bool dart::AssertAssignableInstr::CanBecomeDeoptimizationTarget ( ) const

inlinevirtual

Definition at line 4430 of file il.h.

                                                     {
    // AssertAssignable instructions that are specialized by the optimizer
    // (e.g. replaced with CheckClass) need a deoptimization descriptor before.
    return true;
  }

Canonicalize()

Definition * dart::AssertAssignableInstr::Canonicalize ( FlowGraph *  flow_graph )

virtual

Definition at line 3064 of file il.cc.

                                                                     {
  // We need dst_type() to be a constant AbstractType to perform any
  // canonicalization.
  if (!dst_type()->BindsToConstant()) return this;
  const auto& abs_type = AbstractType::Cast(dst_type()->BoundConstant());
 
  if (abs_type.IsTopTypeForSubtyping() ||
      (FLAG_eliminate_type_checks &&
       value()->Type()->IsAssignableTo(abs_type))) {
    return value()->definition();
  }
  if (abs_type.IsInstantiated()) {
    return this;
  }
 
  // For uninstantiated target types: If the instantiator and function
  // type arguments are constant, instantiate the target type here.
  // Note: these constant type arguments might not necessarily correspond
  // to the correct instantiator because AssertAssignable might
  // be located in the unreachable part of the graph (e.g.
  // it might be dominated by CheckClass that always fails).
  // This means that the code below must guard against such possibility.
  Thread* thread = Thread::Current();
  Zone* Z = thread->zone();
 
  const TypeArguments* instantiator_type_args = nullptr;
  const TypeArguments* function_type_args = nullptr;
 
  if (instantiator_type_arguments()->BindsToConstant()) {
    const Object& val = instantiator_type_arguments()->BoundConstant();
    instantiator_type_args = (val.ptr() == TypeArguments::null())
                                 ? &TypeArguments::null_type_arguments()
                                 : &TypeArguments::Cast(val);
  }
 
  if (function_type_arguments()->BindsToConstant()) {
    const Object& val = function_type_arguments()->BoundConstant();
    function_type_args =
        (val.ptr() == TypeArguments::null())
            ? &TypeArguments::null_type_arguments()
            : &TypeArguments::Cast(function_type_arguments()->BoundConstant());
  }
 
  // If instantiator_type_args are not constant try to match the pattern
  // obj.field.:type_arguments where field's static type exactness state
  // tells us that all values stored in the field have exact superclass.
  // In this case we know the prefix of the actual type arguments vector
  // and can try to instantiate the type using just the prefix.
  //
  // Note: TypeParameter::InstantiateFrom returns an error if we try
  // to instantiate it from a vector that is too short.
  if (instantiator_type_args == nullptr) {
    if (LoadFieldInstr* load_type_args =
            instantiator_type_arguments()->definition()->AsLoadField()) {
      if (load_type_args->slot().IsTypeArguments()) {
        if (LoadFieldInstr* load_field = load_type_args->instance()
                                             ->definition()
                                             ->OriginalDefinition()
                                             ->AsLoadField()) {
          if (load_field->slot().IsDartField() &&
              load_field->slot()
                  .field()
                  .static_type_exactness_state()
                  .IsHasExactSuperClass()) {
            instantiator_type_args = &TypeArguments::Handle(
                Z, Type::Cast(AbstractType::Handle(
                                  Z, load_field->slot().field().type()))
                       .GetInstanceTypeArguments(thread));
          }
        }
      }
    }
  }
 
  if ((instantiator_type_args != nullptr) && (function_type_args != nullptr)) {
    AbstractType& new_dst_type = AbstractType::Handle(
        Z, abs_type.InstantiateFrom(*instantiator_type_args,
                                    *function_type_args, kAllFree, Heap::kOld));
    if (new_dst_type.IsNull()) {
      // Failed instantiation in dead code.
      return this;
    }
    new_dst_type = new_dst_type.Canonicalize(Thread::Current());
 
    // Successfully instantiated destination type: update the type attached
    // to this instruction and set type arguments to null because we no
    // longer need them (the type was instantiated).
    dst_type()->BindTo(flow_graph->GetConstant(new_dst_type));
    instantiator_type_arguments()->BindTo(flow_graph->constant_null());
    function_type_arguments()->BindTo(flow_graph->constant_null());
 
    if (new_dst_type.IsTopTypeForSubtyping() ||
        (FLAG_eliminate_type_checks &&
         value()->Type()->IsAssignableTo(new_dst_type))) {
      return value()->definition();
    }
  }
  return this;
}

ComputeCanDeoptimize()

virtual bool dart::AssertAssignableInstr::ComputeCanDeoptimize ( ) const

inlinevirtual

Definition at line 4414 of file il.h.

{ return false; }

ComputeCanDeoptimizeAfterCall()

virtual bool dart::AssertAssignableInstr::ComputeCanDeoptimizeAfterCall ( ) const

inlinevirtual

Definition at line 4415 of file il.h.

                                                     {
    return !CompilerState::Current().is_aot();
  }

ComputeType()

CompileType dart::AssertAssignableInstr::ComputeType ( ) const

virtual

Definition at line 1374 of file type_propagator.cc.

                                                     {
  CompileType* value_type = value()->Type();
 
  const AbstractType* abs_type = &AbstractType::dynamic_type();
  if (dst_type()->BindsToConstant() &&
      dst_type()->BoundConstant().IsAbstractType()) {
    abs_type = &AbstractType::Cast(dst_type()->BoundConstant());
    if (value_type->IsSubtypeOf(*abs_type)) {
      return *value_type;
    }
  }
  return CompileType::FromAbstractType(*abs_type, value_type->is_nullable(),
                                       CompileType::kCannotBeSentinel);
}

dst_name()

const String & dart::AssertAssignableInstr::dst_name ( ) const

inline

Definition at line 4412 of file il.h.

{ return dst_name_; }

dst_type()

Value * dart::AssertAssignableInstr::dst_type ( ) const

inline

Definition at line 4405 of file il.h.

{ return inputs_[kDstTypePos]; }

function_type_arguments()

Value * dart::AssertAssignableInstr::function_type_arguments ( ) const

inline

Definition at line 4409 of file il.h.

{ return inputs_[kFunctionTAVPos]; }

InferRange()

void dart::AssertAssignableInstr::InferRange ( RangeAnalysis *  analysis, Range *  range  )

virtual

Definition at line 3141 of file range_analysis.cc.

                                                                            {
  const Range* value_range = value()->definition()->range();
  if (!Range::IsUnknown(value_range)) {
    *range = *value_range;
  } else {
    *range = Range::Full(RangeBoundary::kRangeBoundaryInt64);
  }
}

instantiator_type_arguments()

Value * dart::AssertAssignableInstr::instantiator_type_arguments ( ) const

inline

Definition at line 4406 of file il.h.

                                             {
    return inputs_[kInstantiatorTAVPos];
  }

KindToCString()

const char * dart::AssertAssignableInstr::KindToCString ( Kind  kind )

static

Definition at line 814 of file il.cc.

                                                          {
  switch (kind) {
#define KIND_CASE(name)                                                        \
  case k##name:                                                                \
    return #name;
    FOR_EACH_ASSERT_ASSIGNABLE_KIND(KIND_CASE)
#undef KIND_CASE
    default:
      UNREACHABLE();
      return nullptr;
  }
}

NumberOfInputsConsumedBeforeCall()

virtual intptr_t dart::AssertAssignableInstr::NumberOfInputsConsumedBeforeCall ( ) const

inlinevirtual

Definition at line 4418 of file il.h.

                                                            {
#if !defined(TARGET_ARCH_IA32)
    return InputCount();
#else
    // The ia32 implementation calls the stub by pushing the input registers
    // in the same order onto the stack thereby making the deopt-env correct.
    // (Due to lack of registers we cannot use all-argument calling convention
    // as in other architectures.)
    return 0;
#endif
  }

ParseKind()

bool dart::AssertAssignableInstr::ParseKind ( const char *  str, Kind *  out  )

static

Definition at line 827 of file il.cc.

                                                                {
#define KIND_CASE(name)                                                        \
  if (strcmp(str, #name) == 0) {                                               \
    *out = Kind::k##name;                                                      \
    return true;                                                               \
  }
  FOR_EACH_ASSERT_ASSIGNABLE_KIND(KIND_CASE)
#undef KIND_CASE
  return false;
}

RecomputeType()

bool dart::AssertAssignableInstr::RecomputeType ( )

virtual

Definition at line 1389 of file type_propagator.cc.

                                          {
  return UpdateType(ComputeType());
}

RedefinedValue()

Value * dart::AssertAssignableInstr::RedefinedValue ( ) const

virtual

Definition at line 547 of file il.cc.

                                                   {
  return value();
}

statistics_tag()

intptr_t dart::AssertAssignableInstr::statistics_tag ( ) const

virtual

Definition at line 6022 of file il.cc.

                                                     {
  switch (kind_) {
    case kParameterCheck:
      return CombinedCodeStatistics::kTagAssertAssignableParameterCheck;
    case kInsertedByFrontend:
      return CombinedCodeStatistics::kTagAssertAssignableInsertedByFrontend;
    case kFromSource:
      return CombinedCodeStatistics::kTagAssertAssignableFromSource;
    case kUnknown:
      break;
  }
 
  return tag();
}

token_pos()

virtual TokenPosition dart::AssertAssignableInstr::token_pos ( ) const

inlinevirtual

Definition at line 4411 of file il.h.

{ return token_pos_; }

value()

Value * dart::AssertAssignableInstr::value ( ) const

inline

Definition at line 4404 of file il.h.

{ return inputs_[kInstancePos]; }

---

The documentation for this class was generated from the following files:

• third_party/dart-lang/sdk/runtime/vm/compiler/backend/il.h
• third_party/dart-lang/sdk/runtime/vm/compiler/backend/il.cc
• third_party/dart-lang/sdk/runtime/vm/compiler/backend/range_analysis.cc
• third_party/dart-lang/sdk/runtime/vm/compiler/backend/type_propagator.cc