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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_NODE_ORIGIN_TABLE_H_
6 #define V8_COMPILER_NODE_ORIGIN_TABLE_H_
7 
8 #include <limits>
9 
10 #include "src/base/compiler-specific.h"
11 #include "src/codegen/source-position.h"
12 #include "src/common/globals.h"
13 #include "src/compiler/node-aux-data.h"
14 
15 namespace v8 {
16 namespace internal {
17 namespace compiler {
18 
19 class NodeOrigin {
20  public:
21   enum OriginKind { kWasmBytecode, kGraphNode };
NodeOrigin(const char * phase_name,const char * reducer_name,NodeId created_from)22   NodeOrigin(const char* phase_name, const char* reducer_name,
23              NodeId created_from)
24       : phase_name_(phase_name),
25         reducer_name_(reducer_name),
26         origin_kind_(kGraphNode),
27         created_from_(created_from) {}
28 
NodeOrigin(const char * phase_name,const char * reducer_name,OriginKind origin_kind,uint64_t created_from)29   NodeOrigin(const char* phase_name, const char* reducer_name,
30              OriginKind origin_kind, uint64_t created_from)
31       : phase_name_(phase_name),
32         reducer_name_(reducer_name),
33         origin_kind_(origin_kind),
34         created_from_(created_from) {}
35 
36   NodeOrigin(const NodeOrigin& other) V8_NOEXCEPT = default;
Unknown()37   static NodeOrigin Unknown() { return NodeOrigin(); }
38 
IsKnown()39   bool IsKnown() { return created_from_ >= 0; }
created_from()40   int64_t created_from() const { return created_from_; }
reducer_name()41   const char* reducer_name() const { return reducer_name_; }
phase_name()42   const char* phase_name() const { return phase_name_; }
43 
origin_kind()44   OriginKind origin_kind() const { return origin_kind_; }
45 
46   bool operator==(const NodeOrigin& o) const {
47     return reducer_name_ == o.reducer_name_ && created_from_ == o.created_from_;
48   }
49 
50   void PrintJson(std::ostream& out) const;
51 
52  private:
NodeOrigin()53   NodeOrigin()
54       : phase_name_(""),
55         reducer_name_(""),
56         created_from_(std::numeric_limits<int64_t>::min()) {}
57   const char* phase_name_;
58   const char* reducer_name_;
59   OriginKind origin_kind_;
60   int64_t created_from_;
61 };
62 
63 inline bool operator!=(const NodeOrigin& lhs, const NodeOrigin& rhs) {
64   return !(lhs == rhs);
65 }
66 
67 class V8_EXPORT_PRIVATE NodeOriginTable final
NON_EXPORTED_BASE(ZoneObject)68     : public NON_EXPORTED_BASE(ZoneObject) {
69  public:
70   class Scope final {
71    public:
72     Scope(NodeOriginTable* origins, const char* reducer_name, Node* node)
73         : origins_(origins), prev_origin_(NodeOrigin::Unknown()) {
74       if (origins) {
75         prev_origin_ = origins->current_origin_;
76         origins->current_origin_ =
77             NodeOrigin(origins->current_phase_name_, reducer_name, node->id());
78       }
79     }
80 
81     ~Scope() {
82       if (origins_) origins_->current_origin_ = prev_origin_;
83     }
84 
85     Scope(const Scope&) = delete;
86     Scope& operator=(const Scope&) = delete;
87 
88    private:
89     NodeOriginTable* const origins_;
90     NodeOrigin prev_origin_;
91   };
92 
93   class PhaseScope final {
94    public:
95     PhaseScope(NodeOriginTable* origins, const char* phase_name)
96         : origins_(origins) {
97       if (origins != nullptr) {
98         prev_phase_name_ = origins->current_phase_name_;
99         origins->current_phase_name_ =
100             phase_name == nullptr ? "unnamed" : phase_name;
101       }
102     }
103 
104     ~PhaseScope() {
105       if (origins_) origins_->current_phase_name_ = prev_phase_name_;
106     }
107 
108     PhaseScope(const PhaseScope&) = delete;
109     PhaseScope& operator=(const PhaseScope&) = delete;
110 
111    private:
112     NodeOriginTable* const origins_;
113     const char* prev_phase_name_;
114   };
115 
116   explicit NodeOriginTable(Graph* graph);
117   NodeOriginTable(const NodeOriginTable&) = delete;
118   NodeOriginTable& operator=(const NodeOriginTable&) = delete;
119 
120   void AddDecorator();
121   void RemoveDecorator();
122 
123   NodeOrigin GetNodeOrigin(Node* node) const;
124   void SetNodeOrigin(Node* node, const NodeOrigin& no);
125 
126   void SetCurrentPosition(const NodeOrigin& no) { current_origin_ = no; }
127 
128   void PrintJson(std::ostream& os) const;
129 
130  private:
131   class Decorator;
132 
133   Graph* const graph_;
134   Decorator* decorator_;
135   NodeOrigin current_origin_;
136 
137   const char* current_phase_name_;
138   NodeAuxData<NodeOrigin, NodeOrigin::Unknown> table_;
139 };
140 
141 }  // namespace compiler
142 }  // namespace internal
143 }  // namespace v8
144 
145 #endif  // V8_COMPILER_NODE_ORIGIN_TABLE_H_
146