V8 API Reference, 7.2.502.16 (for Deno 0.2.4)
func-name-inferrer.cc
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 
14 FuncNameInferrer::FuncNameInferrer(AstValueFactory* ast_value_factory)
15  : ast_value_factory_(ast_value_factory) {}
16 
17 void FuncNameInferrer::PushEnclosingName(const AstRawString* name) {
18  // Enclosing name is a name of a constructor function. To check
19  // that it is really a constructor, we check that it is not empty
20  // and starts with a capital letter.
21  if (!name->IsEmpty() && unibrow::Uppercase::Is(name->FirstCharacter())) {
22  names_stack_.push_back(Name(name, kEnclosingConstructorName));
23  }
24 }
25 
26 
27 void FuncNameInferrer::PushLiteralName(const AstRawString* name) {
28  if (IsOpen() && name != ast_value_factory_->prototype_string()) {
29  names_stack_.push_back(Name(name, kLiteralName));
30  }
31 }
32 
33 
34 void FuncNameInferrer::PushVariableName(const AstRawString* name) {
35  if (IsOpen() && name != ast_value_factory_->dot_result_string()) {
36  names_stack_.push_back(Name(name, kVariableName));
37  }
38 }
39 
40 void FuncNameInferrer::RemoveAsyncKeywordFromEnd() {
41  if (IsOpen()) {
42  CHECK_GT(names_stack_.size(), 0);
43  CHECK(names_stack_.back().name()->IsOneByteEqualTo("async"));
44  names_stack_.pop_back();
45  }
46 }
47 
48 const AstConsString* FuncNameInferrer::MakeNameFromStack() {
49  if (names_stack_.size() == 0) {
50  return ast_value_factory_->empty_cons_string();
51  }
52  AstConsString* result = ast_value_factory_->NewConsString();
53  auto it = names_stack_.begin();
54  while (it != names_stack_.end()) {
55  // Advance the iterator to be able to peek the next value.
56  auto current = it++;
57  // Skip consecutive variable declarations.
58  if (it != names_stack_.end() && current->type() == kVariableName &&
59  it->type() == kVariableName) {
60  continue;
61  }
62  // Add name. Separate names with ".".
63  Zone* zone = ast_value_factory_->zone();
64  if (!result->IsEmpty()) {
65  result->AddString(zone, ast_value_factory_->dot_string());
66  }
67  result->AddString(zone, current->name());
68  }
69  return result;
70 }
71 
72 void FuncNameInferrer::InferFunctionsNames() {
73  const AstConsString* func_name = MakeNameFromStack();
74  for (FunctionLiteral* func : funcs_to_infer_) {
75  func->set_raw_inferred_name(func_name);
76  }
77  funcs_to_infer_.resize(0);
78 }
79 
80 
81 } // namespace internal
82 } // namespace v8
Definition: libplatform.h:13