dart::LoadCodeUnitsInstr Class Reference

#include <il.h>

Inheritance diagram for dart::LoadCodeUnitsInstr:

Public Member Functions
	LoadCodeUnitsInstr (Value *str, Value *index, intptr_t element_count, intptr_t class_id, const InstructionSource &source)
TokenPosition	token_pos () const
virtual CompileType	ComputeType () const
virtual Representation	RequiredInputRepresentation (intptr_t idx) const
bool	IsExternal () const
Value *	array () const
Value *	index () const
intptr_t	index_scale () const
intptr_t	class_id () const
intptr_t	element_count () const
bool	can_pack_into_smi () const
virtual bool	ComputeCanDeoptimize () const
virtual Representation	representation () const
void	set_representation (Representation repr)
virtual void	InferRange (RangeAnalysis *analysis, Range *range)
virtual bool	HasUnknownSideEffects () const
virtual bool	CanTriggerGC () const
Public Member Functions inherited from dart::TemplateDefinition< 2, NoThrow >
	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

Additional Inherited Members
Public Types inherited from dart::TemplateDefinition< 2, NoThrow >
using	BaseClass = typename NoCSE< Definition, PureDefinition >::Base
Protected Attributes inherited from dart::TemplateDefinition< 2, NoThrow >
EmbeddedArray< Value *, N >	inputs_

Detailed Description

Definition at line 6812 of file il.h.

Constructor & Destructor Documentation

LoadCodeUnitsInstr()

dart::LoadCodeUnitsInstr::LoadCodeUnitsInstr ( Value *  str, Value *  index, intptr_t  element_count, intptr_t  class_id, const InstructionSource &  source  )

inline

Definition at line 6814 of file il.h.

      : TemplateDefinition(source),
        class_id_(class_id),
        token_pos_(source.token_pos),
        element_count_(element_count),
        representation_(kTagged) {
    ASSERT(element_count == 1 || element_count == 2 || element_count == 4);
    ASSERT(IsStringClassId(class_id));
    SetInputAt(0, str);
    SetInputAt(1, index);
  }

Member Function Documentation

array()

Value * dart::LoadCodeUnitsInstr::array ( ) const

inline

Definition at line 6848 of file il.h.

{ return inputs_[0]; }

can_pack_into_smi()

bool dart::LoadCodeUnitsInstr::can_pack_into_smi ( ) const

inline

Definition at line 6858 of file il.h.

                                 {
    return element_count() <=
           compiler::target::kSmiBits / (index_scale() * kBitsPerByte);
  }

CanTriggerGC()

virtual bool dart::LoadCodeUnitsInstr::CanTriggerGC ( ) const

inlinevirtual

Definition at line 6871 of file il.h.

                                    {
    return !can_pack_into_smi() && (representation() == kTagged);
  }

class_id()

intptr_t dart::LoadCodeUnitsInstr::class_id ( ) const

inline

Definition at line 6855 of file il.h.

{ return class_id_; }

ComputeCanDeoptimize()

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

inlinevirtual

Definition at line 6863 of file il.h.

{ return false; }

ComputeType()

CompileType dart::LoadCodeUnitsInstr::ComputeType ( ) const

virtual

Definition at line 1738 of file type_propagator.cc.

                                                  {
  switch (class_id()) {
    case kOneByteStringCid:
    case kTwoByteStringCid:
      return can_pack_into_smi() ? CompileType::FromCid(kSmiCid)
                                 : CompileType::Int();
    default:
      UNIMPLEMENTED();
      return CompileType::Dynamic();
  }
}

element_count()

intptr_t dart::LoadCodeUnitsInstr::element_count ( ) const

inline

Definition at line 6856 of file il.h.

{ return element_count_; }

HasUnknownSideEffects()

virtual bool dart::LoadCodeUnitsInstr::HasUnknownSideEffects ( ) const

inlinevirtual

Definition at line 6869 of file il.h.

{ return false; }

index()

Value * dart::LoadCodeUnitsInstr::index ( ) const

inline

Definition at line 6849 of file il.h.

{ return inputs_[1]; }

index_scale()

intptr_t dart::LoadCodeUnitsInstr::index_scale ( ) const

inline

Definition at line 6851 of file il.h.

                               {
    return compiler::target::Instance::ElementSizeFor(class_id_);
  }

InferRange()

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

virtual

Definition at line 2957 of file range_analysis.cc.

                                                                         {
  ASSERT(IsStringClassId(class_id()));
  RangeBoundary zero = RangeBoundary::FromConstant(0);
  // Take the number of loaded characters into account when determining the
  // range of the result.
  ASSERT(element_count_ > 0);
  switch (class_id()) {
    case kOneByteStringCid:
      ASSERT(element_count_ <= 4);
      *range = Range(zero, RangeBoundary::FromConstant(
                               Utils::NBitMask(kBitsPerByte * element_count_)));
      break;
    case kTwoByteStringCid:
      ASSERT(element_count_ <= 2);
      *range = Range(zero, RangeBoundary::FromConstant(Utils::NBitMask(
                               2 * kBitsPerByte * element_count_)));
      break;
    default:
      UNREACHABLE();
      break;
  }
}

IsExternal()

bool dart::LoadCodeUnitsInstr::IsExternal ( ) const

inline

Definition at line 6844 of file il.h.

                          {
    return array()->definition()->representation() == kUntagged;
  }

representation()

virtual Representation dart::LoadCodeUnitsInstr::representation ( ) const

inlinevirtual

Definition at line 6865 of file il.h.

{ return representation_; }

RequiredInputRepresentation()

virtual Representation dart::LoadCodeUnitsInstr::RequiredInputRepresentation ( intptr_t  idx ) const

inlinevirtual

Definition at line 6835 of file il.h.

                                                                         {
    if (idx == 0) {
      // The string may be tagged or untagged (for external strings).
      return kNoRepresentation;
    }
    ASSERT(idx == 1);
    return kTagged;
  }

set_representation()

void dart::LoadCodeUnitsInstr::set_representation ( Representation  repr )

inline

Definition at line 6866 of file il.h.

{ representation_ = repr; }

token_pos()

TokenPosition dart::LoadCodeUnitsInstr::token_pos ( ) const

inline

Definition at line 6830 of file il.h.

{ return token_pos_; }

---

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