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