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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 
11 namespace v8 {
12 namespace internal {
13 
FuncNameInferrer(AstValueFactory * ast_value_factory)14 FuncNameInferrer::FuncNameInferrer(AstValueFactory* ast_value_factory)
15     : ast_value_factory_(ast_value_factory) {}
16 
PushEnclosingName(const AstRawString * name)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 
PushLiteralName(const AstRawString * name)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 
PushVariableName(const AstRawString * name)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 
RemoveAsyncKeywordFromEnd()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 
MakeNameFromStack()48 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 
InferFunctionsNames()72 void 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