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/objects-inl.h"
10
11namespace v8 {
12namespace internal {
13
14FuncNameInferrer::FuncNameInferrer(AstValueFactory* ast_value_factory)
15    : ast_value_factory_(ast_value_factory) {}
16
17void 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
27void 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
34void 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
40void 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
48AstConsString* 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_->single_parse_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
72void FuncNameInferrer::InferFunctionsNames() {
73  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
83