1 // Copyright 2011 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 #include "src/parsing/func-name-inferrer.h"
6
7 #include "src/ast/ast-value-factory.h"
8 #include "src/ast/ast.h"
9 #include "src/objects-inl.h"
10
11 namespace v8 {
12 namespace internal {
13
FuncNameInferrer(AstValueFactory * ast_value_factory,Zone * zone)14 FuncNameInferrer::FuncNameInferrer(AstValueFactory* ast_value_factory,
15 Zone* zone)
16 : ast_value_factory_(ast_value_factory),
17 entries_stack_(zone),
18 names_stack_(zone),
19 funcs_to_infer_(zone),
20 zone_(zone) {}
21
PushEnclosingName(const AstRawString * name)22 void FuncNameInferrer::PushEnclosingName(const AstRawString* name) {
23 // Enclosing name is a name of a constructor function. To check
24 // that it is really a constructor, we check that it is not empty
25 // and starts with a capital letter.
26 if (!name->IsEmpty() && unibrow::Uppercase::Is(name->FirstCharacter())) {
27 names_stack_.push_back(Name(name, kEnclosingConstructorName));
28 }
29 }
30
31
PushLiteralName(const AstRawString * name)32 void FuncNameInferrer::PushLiteralName(const AstRawString* name) {
33 if (IsOpen() && name != ast_value_factory_->prototype_string()) {
34 names_stack_.push_back(Name(name, kLiteralName));
35 }
36 }
37
38
PushVariableName(const AstRawString * name)39 void FuncNameInferrer::PushVariableName(const AstRawString* name) {
40 if (IsOpen() && name != ast_value_factory_->dot_result_string()) {
41 names_stack_.push_back(Name(name, kVariableName));
42 }
43 }
44
RemoveAsyncKeywordFromEnd()45 void FuncNameInferrer::RemoveAsyncKeywordFromEnd() {
46 if (IsOpen()) {
47 CHECK_GT(names_stack_.size(), 0);
48 CHECK(names_stack_.back().name->IsOneByteEqualTo("async"));
49 names_stack_.pop_back();
50 }
51 }
52
Leave()53 void FuncNameInferrer::Leave() {
54 DCHECK(IsOpen());
55 size_t last_entry = entries_stack_.back();
56 entries_stack_.pop_back();
57 names_stack_.Rewind(last_entry);
58 if (entries_stack_.is_empty()) funcs_to_infer_.Rewind();
59 }
60
MakeNameFromStack()61 const AstConsString* FuncNameInferrer::MakeNameFromStack() {
62 AstConsString* result = ast_value_factory_->NewConsString();
63 auto it = names_stack_.begin();
64 while (it != names_stack_.end()) {
65 // Advance the iterator to be able to peek the next value.
66 auto current = it++;
67 // Skip consecutive variable declarations.
68 if (it != names_stack_.end() && current->type == kVariableName &&
69 it->type == kVariableName) {
70 continue;
71 }
72 // Add name. Separate names with ".".
73 if (!result->IsEmpty()) {
74 result->AddString(zone(), ast_value_factory_->dot_string());
75 }
76 result->AddString(zone(), current->name);
77 }
78 return result;
79 }
80
InferFunctionsNames()81 void FuncNameInferrer::InferFunctionsNames() {
82 const AstConsString* func_name = MakeNameFromStack();
83 for (FunctionLiteral* func : funcs_to_infer_) {
84 func->set_raw_inferred_name(func_name);
85 }
86 funcs_to_infer_.Rewind(0);
87 }
88
89
90 } // namespace internal
91 } // namespace v8
92