1// Copyright 2014 the V8 project authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef V8_COMPILER_JS_GENERIC_LOWERING_H_
6#define V8_COMPILER_JS_GENERIC_LOWERING_H_
7
8#include "src/v8.h"
9
10#include "src/allocation.h"
11#include "src/code-factory.h"
12#include "src/compiler/graph.h"
13#include "src/compiler/graph-reducer.h"
14#include "src/compiler/js-graph.h"
15#include "src/compiler/opcodes.h"
16
17namespace v8 {
18namespace internal {
19namespace compiler {
20
21// Forward declarations.
22class CommonOperatorBuilder;
23class MachineOperatorBuilder;
24class Linkage;
25
26// Lowers JS-level operators to runtime and IC calls in the "generic" case.
27class JSGenericLowering : public Reducer {
28 public:
29  JSGenericLowering(CompilationInfo* info, JSGraph* graph);
30  virtual ~JSGenericLowering() {}
31
32  virtual Reduction Reduce(Node* node);
33
34 protected:
35#define DECLARE_LOWER(x) void Lower##x(Node* node);
36  // Dispatched depending on opcode.
37  ALL_OP_LIST(DECLARE_LOWER)
38#undef DECLARE_LOWER
39
40  // Helpers to create new constant nodes.
41  Node* SmiConstant(int immediate);
42  Node* Int32Constant(int immediate);
43  Node* CodeConstant(Handle<Code> code);
44  Node* FunctionConstant(Handle<JSFunction> function);
45  Node* ExternalConstant(ExternalReference ref);
46
47  // Helpers to patch existing nodes in the graph.
48  void PatchOperator(Node* node, const Operator* new_op);
49  void PatchInsertInput(Node* node, int index, Node* input);
50
51  // Helpers to replace existing nodes with a generic call.
52  void ReplaceWithCompareIC(Node* node, Token::Value token, bool pure);
53  void ReplaceWithStubCall(Node* node, Callable c, CallDescriptor::Flags flags);
54  void ReplaceWithBuiltinCall(Node* node, Builtins::JavaScript id, int args);
55  void ReplaceWithRuntimeCall(Node* node, Runtime::FunctionId f, int args = -1);
56
57  Zone* zone() const { return graph()->zone(); }
58  Isolate* isolate() const { return zone()->isolate(); }
59  JSGraph* jsgraph() const { return jsgraph_; }
60  Graph* graph() const { return jsgraph()->graph(); }
61  Linkage* linkage() const { return linkage_; }
62  CompilationInfo* info() const { return info_; }
63  CommonOperatorBuilder* common() const { return jsgraph()->common(); }
64  MachineOperatorBuilder* machine() const { return jsgraph()->machine(); }
65
66 private:
67  CompilationInfo* info_;
68  JSGraph* jsgraph_;
69  Linkage* linkage_;
70  SetOncePointer<Node> centrystub_constant_;
71};
72
73}  // namespace compiler
74}  // namespace internal
75}  // namespace v8
76
77#endif  // V8_COMPILER_JS_GENERIC_LOWERING_H_
78