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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.
#ifndef V8_COMPILER_FAST_ACCESSOR_ASSEMBLER_H_
#define V8_COMPILER_FAST_ACCESSOR_ASSEMBLER_H_
#include <stdint.h>
#include <vector>
// Clients of this interface shouldn't depend on lots of compiler internals.
// Do not include anything from src/compiler here!
#include "include/v8-experimental.h"
#include "src/base/macros.h"
#include "src/base/smart-pointers.h"
#include "src/handles.h"
namespace v8 {
namespace internal {
class Code;
class Isolate;
class Zone;
namespace compiler {
class Node;
class RawMachineAssembler;
class RawMachineLabel;
// This interface "exports" an aggregated subset of RawMachineAssembler, for
// use by the API to implement Fast Dom Accessors.
//
// This interface is made for this single purpose only and does not attempt
// to implement a general purpose solution. If you need one, please look at
// RawMachineAssembler instead.
//
// The life cycle of a FastAccessorAssembler has two phases:
// - After creating the instance, you can call an arbitrary sequence of
// builder functions to build the desired function.
// - When done, you can Build() the accessor and query for the build results.
//
// You cannot call any result getters before Build() was called & successful;
// and you cannot call any builder functions after Build() was called.
class FastAccessorAssembler {
public:
typedef v8::experimental::FastAccessorBuilder::ValueId ValueId;
typedef v8::experimental::FastAccessorBuilder::LabelId LabelId;
explicit FastAccessorAssembler(Isolate* isolate);
~FastAccessorAssembler();
// Builder / assembler functions:
ValueId IntegerConstant(int int_constant);
ValueId GetReceiver();
ValueId LoadInternalField(ValueId value_id, int field_no);
ValueId LoadValue(ValueId value_id, int offset);
ValueId LoadObject(ValueId value_id, int offset);
// Builder / assembler functions for control flow.
void ReturnValue(ValueId value_id);
void CheckFlagSetOrReturnNull(ValueId value_id, int mask);
void CheckNotZeroOrReturnNull(ValueId value_id);
// TODO(vogelheim): Implement a C++ callback.
// void CheckNotNullOrCallback(ValueId value_id, ..c++-callback type...,
// ValueId arg1, ValueId arg2, ...);
LabelId MakeLabel();
void SetLabel(LabelId label_id);
void CheckNotZeroOrJump(ValueId value_id, LabelId label_id);
// Assemble the code.
MaybeHandle<Code> Build();
private:
ValueId FromRaw(Node* node);
LabelId FromRaw(RawMachineLabel* label);
Node* FromId(ValueId value) const;
RawMachineLabel* FromId(LabelId value) const;
Zone* zone() { return &zone_; }
Zone zone_;
base::SmartPointer<RawMachineAssembler> assembler_;
// To prevent exposing the RMA internals to the outside world, we'll map
// Node + Label pointers integers wrapped in ValueId and LabelId instances.
// These vectors maintain this mapping.
std::vector<Node*> nodes_;
std::vector<RawMachineLabel*> labels_;
// Remember the current state for easy error checking. (We prefer to be
// strict as this class will be exposed at the API.)
enum { kBuilding, kBuilt, kError } state_;
DISALLOW_COPY_AND_ASSIGN(FastAccessorAssembler);
};
} // namespace compiler
} // namespace internal
} // namespace v8
#endif // V8_COMPILER_FAST_ACCESSOR_ASSEMBLER_H_
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