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1 : // Copyright 2015 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_INLINING_HEURISTIC_H_
6 : #define V8_COMPILER_JS_INLINING_HEURISTIC_H_
7 :
8 : #include "src/compiler/js-inlining.h"
9 :
10 : namespace v8 {
11 : namespace internal {
12 : namespace compiler {
13 :
14 913452 : class JSInliningHeuristic final : public AdvancedReducer {
15 : public:
16 : enum Mode { kGeneralInlining, kRestrictedInlining, kStressInlining };
17 : JSInliningHeuristic(Editor* editor, Mode mode, Zone* local_zone,
18 : OptimizedCompilationInfo* info, JSGraph* jsgraph,
19 : JSHeapBroker* broker,
20 : SourcePositionTable* source_positions)
21 : : AdvancedReducer(editor),
22 : mode_(mode),
23 : inliner_(editor, local_zone, info, jsgraph, broker, source_positions),
24 : candidates_(local_zone),
25 : seen_(local_zone),
26 : source_positions_(source_positions),
27 913462 : jsgraph_(jsgraph) {}
28 :
29 18 : const char* reducer_name() const override { return "JSInliningHeuristic"; }
30 :
31 : Reduction Reduce(Node* node) final;
32 :
33 : // Processes the list of candidates gathered while the reducer was running,
34 : // and inlines call sites that the heuristic determines to be important.
35 : void Finalize() final;
36 :
37 : private:
38 : // This limit currently matches what the old compiler did. We may want to
39 : // re-evaluate and come up with a proper limit for TurboFan.
40 : static const int kMaxCallPolymorphism = 4;
41 :
42 5910672 : struct Candidate {
43 : Handle<JSFunction> functions[kMaxCallPolymorphism];
44 : // In the case of polymorphic inlining, this tells if each of the
45 : // functions could be inlined.
46 : bool can_inline_function[kMaxCallPolymorphism];
47 : // Strong references to bytecode to ensure it is not flushed from SFI
48 : // while choosing inlining candidates.
49 : Handle<BytecodeArray> bytecode[kMaxCallPolymorphism];
50 : // TODO(2206): For now polymorphic inlining is treated orthogonally to
51 : // inlining based on SharedFunctionInfo. This should be unified and the
52 : // above array should be switched to SharedFunctionInfo instead. Currently
53 : // we use {num_functions == 1 && functions[0].is_null()} as an indicator.
54 : Handle<SharedFunctionInfo> shared_info;
55 : int num_functions;
56 : Node* node = nullptr; // The call site at which to inline.
57 : CallFrequency frequency; // Relative frequency of this call site.
58 : int total_size = 0;
59 : };
60 :
61 : // Comparator for candidates.
62 : struct CandidateCompare {
63 : bool operator()(const Candidate& left, const Candidate& right) const;
64 : };
65 :
66 : // Candidates are kept in a sorted set of unique candidates.
67 : typedef ZoneSet<Candidate, CandidateCompare> Candidates;
68 :
69 : // Dumps candidates to console.
70 : void PrintCandidates();
71 : Reduction InlineCandidate(Candidate const& candidate, bool small_function);
72 : void CreateOrReuseDispatch(Node* node, Node* callee,
73 : Candidate const& candidate, Node** if_successes,
74 : Node** calls, Node** inputs, int input_count);
75 : bool TryReuseDispatch(Node* node, Node* callee, Candidate const& candidate,
76 : Node** if_successes, Node** calls, Node** inputs,
77 : int input_count);
78 : enum StateCloneMode { kCloneState, kChangeInPlace };
79 : Node* DuplicateFrameStateAndRename(Node* frame_state, Node* from, Node* to,
80 : StateCloneMode mode);
81 : Node* DuplicateStateValuesAndRename(Node* state_values, Node* from, Node* to,
82 : StateCloneMode mode);
83 :
84 : CommonOperatorBuilder* common() const;
85 : Graph* graph() const;
86 : JSGraph* jsgraph() const { return jsgraph_; }
87 688203 : Isolate* isolate() const { return jsgraph_->isolate(); }
88 : SimplifiedOperatorBuilder* simplified() const;
89 :
90 : Mode const mode_;
91 : JSInliner inliner_;
92 : Candidates candidates_;
93 : ZoneSet<NodeId> seen_;
94 : SourcePositionTable* source_positions_;
95 : JSGraph* const jsgraph_;
96 : int cumulative_count_ = 0;
97 : };
98 :
99 : } // namespace compiler
100 : } // namespace internal
101 : } // namespace v8
102 :
103 : #endif // V8_COMPILER_JS_INLINING_HEURISTIC_H_
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