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1 // Copyright 2011 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are
4 // met:
5 //
6 //     * Redistributions of source code must retain the above copyright
7 //       notice, this list of conditions and the following disclaimer.
8 //     * Redistributions in binary form must reproduce the above
9 //       copyright notice, this list of conditions and the following
10 //       disclaimer in the documentation and/or other materials provided
11 //       with the distribution.
12 //     * Neither the name of Google Inc. nor the names of its
13 //       contributors may be used to endorse or promote products derived
14 //       from this software without specific prior written permission.
15 //
16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 
28 #include "v8.h"
29 
30 #include "ast.h"
31 #include "func-name-inferrer.h"
32 #include "list-inl.h"
33 
34 namespace v8 {
35 namespace internal {
36 
FuncNameInferrer(Isolate * isolate)37 FuncNameInferrer::FuncNameInferrer(Isolate* isolate)
38     : isolate_(isolate),
39       entries_stack_(10),
40       names_stack_(5),
41       funcs_to_infer_(4) {
42 }
43 
44 
PushEnclosingName(Handle<String> name)45 void FuncNameInferrer::PushEnclosingName(Handle<String> name) {
46   // Enclosing name is a name of a constructor function. To check
47   // that it is really a constructor, we check that it is not empty
48   // and starts with a capital letter.
49   if (name->length() > 0 && Runtime::IsUpperCaseChar(
50           isolate()->runtime_state(), name->Get(0))) {
51     names_stack_.Add(Name(name, kEnclosingConstructorName));
52   }
53 }
54 
55 
PushLiteralName(Handle<String> name)56 void FuncNameInferrer::PushLiteralName(Handle<String> name) {
57   if (IsOpen() && !isolate()->heap()->prototype_symbol()->Equals(*name)) {
58     names_stack_.Add(Name(name, kLiteralName));
59   }
60 }
61 
62 
PushVariableName(Handle<String> name)63 void FuncNameInferrer::PushVariableName(Handle<String> name) {
64   if (IsOpen() && !isolate()->heap()->result_symbol()->Equals(*name)) {
65     names_stack_.Add(Name(name, kVariableName));
66   }
67 }
68 
69 
MakeNameFromStack()70 Handle<String> FuncNameInferrer::MakeNameFromStack() {
71   return MakeNameFromStackHelper(0, isolate()->factory()->empty_string());
72 }
73 
74 
MakeNameFromStackHelper(int pos,Handle<String> prev)75 Handle<String> FuncNameInferrer::MakeNameFromStackHelper(int pos,
76                                                          Handle<String> prev) {
77   if (pos >= names_stack_.length()) return prev;
78   if (pos < names_stack_.length() - 1 &&
79       names_stack_.at(pos).type == kVariableName &&
80       names_stack_.at(pos + 1).type == kVariableName) {
81     // Skip consecutive variable declarations.
82     return MakeNameFromStackHelper(pos + 1, prev);
83   } else {
84     if (prev->length() > 0) {
85       Factory* factory = isolate()->factory();
86       Handle<String> curr = factory->NewConsString(
87           factory->dot_symbol(), names_stack_.at(pos).name);
88       return MakeNameFromStackHelper(pos + 1,
89                                      factory->NewConsString(prev, curr));
90     } else {
91       return MakeNameFromStackHelper(pos + 1, names_stack_.at(pos).name);
92     }
93   }
94 }
95 
96 
InferFunctionsNames()97 void FuncNameInferrer::InferFunctionsNames() {
98   Handle<String> func_name = MakeNameFromStack();
99   for (int i = 0; i < funcs_to_infer_.length(); ++i) {
100     funcs_to_infer_[i]->set_inferred_name(func_name);
101   }
102   funcs_to_infer_.Rewind(0);
103 }
104 
105 
106 } }  // namespace v8::internal
107