src/compiler/access-builder.cc

// Copyright 2014 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/access-builder.h"

#include "src/contexts.h"
#include "src/frames.h"
#include "src/handles-inl.h"
#include "src/heap/heap.h"
#include "src/type-cache.h"

namespace v8 {
namespace internal {
namespace compiler {

// static
FieldAccess AccessBuilder::ForMap() {
  FieldAccess access = {
      kTaggedBase, HeapObject::kMapOffset,   MaybeHandle<Name>(),
      Type::Any(), MachineType::AnyTagged(), kMapWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForHeapNumberValue() {
  FieldAccess access = {kTaggedBase,
                        HeapNumber::kValueOffset,
                        MaybeHandle<Name>(),
                        TypeCache::Get().kFloat64,
                        MachineType::Float64(),
                        kNoWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForJSObjectProperties() {
  FieldAccess access = {
      kTaggedBase,      JSObject::kPropertiesOffset, MaybeHandle<Name>(),
      Type::Internal(), MachineType::AnyTagged(),    kPointerWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForJSObjectElements() {
  FieldAccess access = {
      kTaggedBase,      JSObject::kElementsOffset, MaybeHandle<Name>(),
      Type::Internal(), MachineType::AnyTagged(),  kPointerWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForJSObjectInObjectProperty(Handle<Map> map,
                                                       int index) {
  int const offset = map->GetInObjectPropertyOffset(index);
  FieldAccess access = {kTaggedBase,
                        offset,
                        MaybeHandle<Name>(),
                        Type::Tagged(),
                        MachineType::AnyTagged(),
                        kFullWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForJSFunctionPrototypeOrInitialMap() {
  FieldAccess access = {kTaggedBase,
                        JSFunction::kPrototypeOrInitialMapOffset,
                        MaybeHandle<Name>(),
                        Type::Any(),
                        MachineType::AnyTagged(),
                        kFullWriteBarrier};
  return access;
}

// static
FieldAccess AccessBuilder::ForJSFunctionContext() {
  FieldAccess access = {
      kTaggedBase,      JSFunction::kContextOffset, MaybeHandle<Name>(),
      Type::Internal(), MachineType::AnyTagged(),   kPointerWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForJSFunctionSharedFunctionInfo() {
  FieldAccess access = {kTaggedBase,
                        JSFunction::kSharedFunctionInfoOffset,
                        Handle<Name>(),
                        Type::Any(),
                        MachineType::AnyTagged(),
                        kPointerWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForJSFunctionLiterals() {
  FieldAccess access = {
      kTaggedBase,      JSFunction::kLiteralsOffset, Handle<Name>(),
      Type::Internal(), MachineType::AnyTagged(),    kPointerWriteBarrier};
  return access;
}

// static
FieldAccess AccessBuilder::ForJSFunctionCodeEntry() {
  FieldAccess access = {kTaggedBase,
                        JSFunction::kCodeEntryOffset,
                        Handle<Name>(),
                        Type::UntaggedPointer(),
                        MachineType::Pointer(),
                        kNoWriteBarrier};
  return access;
}

// static
FieldAccess AccessBuilder::ForJSFunctionNextFunctionLink() {
  FieldAccess access = {kTaggedBase,
                        JSFunction::kNextFunctionLinkOffset,
                        Handle<Name>(),
                        Type::Any(),
                        MachineType::AnyTagged(),
                        kPointerWriteBarrier};
  return access;
}

// static
FieldAccess AccessBuilder::ForJSArrayLength(ElementsKind elements_kind) {
  TypeCache const& type_cache = TypeCache::Get();
  FieldAccess access = {kTaggedBase,
                        JSArray::kLengthOffset,
                        Handle<Name>(),
                        type_cache.kJSArrayLengthType,
                        MachineType::AnyTagged(),
                        kFullWriteBarrier};
  if (IsFastDoubleElementsKind(elements_kind)) {
    access.type = type_cache.kFixedDoubleArrayLengthType;
    access.write_barrier_kind = kNoWriteBarrier;
  } else if (IsFastElementsKind(elements_kind)) {
    access.type = type_cache.kFixedArrayLengthType;
    access.write_barrier_kind = kNoWriteBarrier;
  }
  return access;
}


// static
FieldAccess AccessBuilder::ForJSArrayBufferBackingStore() {
  FieldAccess access = {kTaggedBase,
                        JSArrayBuffer::kBackingStoreOffset,
                        MaybeHandle<Name>(),
                        Type::UntaggedPointer(),
                        MachineType::Pointer(),
                        kNoWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForJSArrayBufferBitField() {
  FieldAccess access = {kTaggedBase,         JSArrayBuffer::kBitFieldOffset,
                        MaybeHandle<Name>(), TypeCache::Get().kInt8,
                        MachineType::Int8(), kNoWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForJSArrayBufferViewBuffer() {
  FieldAccess access = {kTaggedBase,
                        JSArrayBufferView::kBufferOffset,
                        MaybeHandle<Name>(),
                        Type::TaggedPointer(),
                        MachineType::AnyTagged(),
                        kPointerWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForJSDateField(JSDate::FieldIndex index) {
  FieldAccess access = {kTaggedBase,
                        JSDate::kValueOffset + index * kPointerSize,
                        MaybeHandle<Name>(),
                        Type::Number(),
                        MachineType::AnyTagged(),
                        kFullWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForJSIteratorResultDone() {
  FieldAccess access = {
      kTaggedBase, JSIteratorResult::kDoneOffset, MaybeHandle<Name>(),
      Type::Any(), MachineType::AnyTagged(),      kFullWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForJSIteratorResultValue() {
  FieldAccess access = {
      kTaggedBase, JSIteratorResult::kValueOffset, MaybeHandle<Name>(),
      Type::Any(), MachineType::AnyTagged(),       kFullWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForJSRegExpFlags() {
  FieldAccess access = {
      kTaggedBase,    JSRegExp::kFlagsOffset,   MaybeHandle<Name>(),
      Type::Tagged(), MachineType::AnyTagged(), kFullWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForJSRegExpSource() {
  FieldAccess access = {
      kTaggedBase,    JSRegExp::kSourceOffset,  MaybeHandle<Name>(),
      Type::Tagged(), MachineType::AnyTagged(), kFullWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForFixedArrayLength() {
  FieldAccess access = {kTaggedBase,
                        FixedArray::kLengthOffset,
                        MaybeHandle<Name>(),
                        TypeCache::Get().kFixedArrayLengthType,
                        MachineType::AnyTagged(),
                        kNoWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForDescriptorArrayEnumCache() {
  FieldAccess access = {kTaggedBase,
                        DescriptorArray::kEnumCacheOffset,
                        Handle<Name>(),
                        Type::TaggedPointer(),
                        MachineType::AnyTagged(),
                        kPointerWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForDescriptorArrayEnumCacheBridgeCache() {
  FieldAccess access = {kTaggedBase,
                        DescriptorArray::kEnumCacheBridgeCacheOffset,
                        Handle<Name>(),
                        Type::TaggedPointer(),
                        MachineType::AnyTagged(),
                        kPointerWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForMapBitField() {
  FieldAccess access = {kTaggedBase,          Map::kBitFieldOffset,
                        Handle<Name>(),       TypeCache::Get().kUint8,
                        MachineType::Uint8(), kNoWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForMapBitField3() {
  FieldAccess access = {kTaggedBase,          Map::kBitField3Offset,
                        Handle<Name>(),       TypeCache::Get().kInt32,
                        MachineType::Int32(), kNoWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForMapDescriptors() {
  FieldAccess access = {
      kTaggedBase,           Map::kDescriptorsOffset,  Handle<Name>(),
      Type::TaggedPointer(), MachineType::AnyTagged(), kPointerWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForMapInstanceType() {
  FieldAccess access = {kTaggedBase,          Map::kInstanceTypeOffset,
                        Handle<Name>(),       TypeCache::Get().kUint8,
                        MachineType::Uint8(), kNoWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForMapPrototype() {
  FieldAccess access = {
      kTaggedBase,           Map::kPrototypeOffset,    Handle<Name>(),
      Type::TaggedPointer(), MachineType::AnyTagged(), kPointerWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForStringLength() {
  FieldAccess access = {kTaggedBase,
                        String::kLengthOffset,
                        Handle<Name>(),
                        TypeCache::Get().kStringLengthType,
                        MachineType::AnyTagged(),
                        kNoWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForJSGlobalObjectGlobalProxy() {
  FieldAccess access = {kTaggedBase,
                        JSGlobalObject::kGlobalProxyOffset,
                        Handle<Name>(),
                        Type::Receiver(),
                        MachineType::AnyTagged(),
                        kPointerWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForJSGlobalObjectNativeContext() {
  FieldAccess access = {kTaggedBase,
                        JSGlobalObject::kNativeContextOffset,
                        Handle<Name>(),
                        Type::Internal(),
                        MachineType::AnyTagged(),
                        kPointerWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForValue() {
  FieldAccess access = {
      kTaggedBase, JSValue::kValueOffset,    Handle<Name>(),
      Type::Any(), MachineType::AnyTagged(), kFullWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForArgumentsLength() {
  FieldAccess access = {
      kTaggedBase, JSArgumentsObject::kLengthOffset, Handle<Name>(),
      Type::Any(), MachineType::AnyTagged(),         kFullWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForArgumentsCallee() {
  FieldAccess access = {kTaggedBase,
                        JSSloppyArgumentsObject::kCalleeOffset,
                        Handle<Name>(),
                        Type::Any(),
                        MachineType::AnyTagged(),
                        kPointerWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForFixedArraySlot(size_t index) {
  int offset = FixedArray::OffsetOfElementAt(static_cast<int>(index));
  FieldAccess access = {kTaggedBase,
                        offset,
                        Handle<Name>(),
                        Type::Any(),
                        MachineType::AnyTagged(),
                        kFullWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForContextSlot(size_t index) {
  int offset = Context::kHeaderSize + static_cast<int>(index) * kPointerSize;
  DCHECK_EQ(offset,
            Context::SlotOffset(static_cast<int>(index)) + kHeapObjectTag);
  FieldAccess access = {kTaggedBase,
                        offset,
                        Handle<Name>(),
                        Type::Any(),
                        MachineType::AnyTagged(),
                        kFullWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForPropertyCellValue() {
  return ForPropertyCellValue(Type::Tagged());
}


// static
FieldAccess AccessBuilder::ForPropertyCellValue(Type* type) {
  FieldAccess access = {
      kTaggedBase, PropertyCell::kValueOffset, Handle<Name>(),
      type,        MachineType::AnyTagged(),   kFullWriteBarrier};
  return access;
}


// static
FieldAccess AccessBuilder::ForSharedFunctionInfoTypeFeedbackVector() {
  FieldAccess access = {kTaggedBase,
                        SharedFunctionInfo::kFeedbackVectorOffset,
                        Handle<Name>(),
                        Type::Any(),
                        MachineType::AnyTagged(),
                        kPointerWriteBarrier};
  return access;
}


// static
ElementAccess AccessBuilder::ForFixedArrayElement() {
  ElementAccess access = {kTaggedBase, FixedArray::kHeaderSize, Type::Tagged(),
                          MachineType::AnyTagged(), kFullWriteBarrier};
  return access;
}


// static
ElementAccess AccessBuilder::ForFixedDoubleArrayElement() {
  ElementAccess access = {kTaggedBase, FixedDoubleArray::kHeaderSize,
                          TypeCache::Get().kFloat64, MachineType::Float64(),
                          kNoWriteBarrier};
  return access;
}


// static
ElementAccess AccessBuilder::ForTypedArrayElement(ExternalArrayType type,
                                                  bool is_external) {
  BaseTaggedness taggedness = is_external ? kUntaggedBase : kTaggedBase;
  int header_size = is_external ? 0 : FixedTypedArrayBase::kDataOffset;
  switch (type) {
    case kExternalInt8Array: {
      ElementAccess access = {taggedness, header_size, Type::Signed32(),
                              MachineType::Int8(), kNoWriteBarrier};
      return access;
    }
    case kExternalUint8Array:
    case kExternalUint8ClampedArray: {
      ElementAccess access = {taggedness, header_size, Type::Unsigned32(),
                              MachineType::Uint8(), kNoWriteBarrier};
      return access;
    }
    case kExternalInt16Array: {
      ElementAccess access = {taggedness, header_size, Type::Signed32(),
                              MachineType::Int16(), kNoWriteBarrier};
      return access;
    }
    case kExternalUint16Array: {
      ElementAccess access = {taggedness, header_size, Type::Unsigned32(),
                              MachineType::Uint16(), kNoWriteBarrier};
      return access;
    }
    case kExternalInt32Array: {
      ElementAccess access = {taggedness, header_size, Type::Signed32(),
                              MachineType::Int32(), kNoWriteBarrier};
      return access;
    }
    case kExternalUint32Array: {
      ElementAccess access = {taggedness, header_size, Type::Unsigned32(),
                              MachineType::Uint32(), kNoWriteBarrier};
      return access;
    }
    case kExternalFloat32Array: {
      ElementAccess access = {taggedness, header_size, Type::Number(),
                              MachineType::Float32(), kNoWriteBarrier};
      return access;
    }
    case kExternalFloat64Array: {
      ElementAccess access = {taggedness, header_size, Type::Number(),
                              MachineType::Float64(), kNoWriteBarrier};
      return access;
    }
  }
  UNREACHABLE();
  ElementAccess access = {kUntaggedBase, 0, Type::None(), MachineType::None(),
                          kNoWriteBarrier};
  return access;
}

}  // namespace compiler
}  // namespace internal
}  // namespace v8