blob: 971061b05378cc9be2e2728307fe43b29656038e [file] [log] [blame]
Ben Murdoch8b112d22011-06-08 16:22:53 +01001// Copyright 2011 the V8 project authors. All rights reserved.
Steve Blocka7e24c12009-10-30 11:49:00 +00002// 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 "scopes.h"
32#include "variables.h"
33
34namespace v8 {
35namespace internal {
36
37// ----------------------------------------------------------------------------
Steve Blocka7e24c12009-10-30 11:49:00 +000038// Implementation Variable.
39
Steve Blocka7e24c12009-10-30 11:49:00 +000040const char* Variable::Mode2String(Mode mode) {
41 switch (mode) {
42 case VAR: return "VAR";
43 case CONST: return "CONST";
Ben Murdoch69a99ed2011-11-30 16:03:39 +000044 case LET: return "LET";
Steve Blocka7e24c12009-10-30 11:49:00 +000045 case DYNAMIC: return "DYNAMIC";
46 case DYNAMIC_GLOBAL: return "DYNAMIC_GLOBAL";
47 case DYNAMIC_LOCAL: return "DYNAMIC_LOCAL";
48 case INTERNAL: return "INTERNAL";
49 case TEMPORARY: return "TEMPORARY";
50 }
51 UNREACHABLE();
52 return NULL;
53}
54
55
Steve Blocka7e24c12009-10-30 11:49:00 +000056Variable::Variable(Scope* scope,
57 Handle<String> name,
58 Mode mode,
59 bool is_valid_LHS,
60 Kind kind)
61 : scope_(scope),
62 name_(name),
63 mode_(mode),
Steve Blocka7e24c12009-10-30 11:49:00 +000064 kind_(kind),
Ben Murdoch589d6972011-11-30 16:04:58 +000065 location_(UNALLOCATED),
66 index_(-1),
Steve Blocka7e24c12009-10-30 11:49:00 +000067 local_if_not_shadowed_(NULL),
Steve Block1e0659c2011-05-24 12:43:12 +010068 is_valid_LHS_(is_valid_LHS),
Steve Blocka7e24c12009-10-30 11:49:00 +000069 is_accessed_from_inner_scope_(false),
Steve Block1e0659c2011-05-24 12:43:12 +010070 is_used_(false) {
Steve Blocka7e24c12009-10-30 11:49:00 +000071 // names must be canonicalized for fast equality checks
72 ASSERT(name->IsSymbol());
73}
74
75
76bool Variable::is_global() const {
77 // Temporaries are never global, they must always be allocated in the
78 // activation frame.
79 return mode_ != TEMPORARY && scope_ != NULL && scope_->is_global_scope();
80}
81
82} } // namespace v8::internal