Ben Murdoch | 8b112d2 | 2011-06-08 16:22:53 +0100 | [diff] [blame] | 1 | // Copyright 2011 the V8 project authors. All rights reserved. |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 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 "scopes.h" |
| 32 | #include "variables.h" |
| 33 | |
| 34 | namespace v8 { |
| 35 | namespace internal { |
| 36 | |
| 37 | // ---------------------------------------------------------------------------- |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 38 | // Implementation Variable. |
| 39 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 40 | const char* Variable::Mode2String(Mode mode) { |
| 41 | switch (mode) { |
| 42 | case VAR: return "VAR"; |
| 43 | case CONST: return "CONST"; |
| 44 | case DYNAMIC: return "DYNAMIC"; |
| 45 | case DYNAMIC_GLOBAL: return "DYNAMIC_GLOBAL"; |
| 46 | case DYNAMIC_LOCAL: return "DYNAMIC_LOCAL"; |
| 47 | case INTERNAL: return "INTERNAL"; |
| 48 | case TEMPORARY: return "TEMPORARY"; |
| 49 | } |
| 50 | UNREACHABLE(); |
| 51 | return NULL; |
| 52 | } |
| 53 | |
| 54 | |
Kristian Monsen | 0d5e116 | 2010-09-30 15:31:59 +0100 | [diff] [blame] | 55 | Property* Variable::AsProperty() const { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 56 | return rewrite_ == NULL ? NULL : rewrite_->AsProperty(); |
| 57 | } |
| 58 | |
| 59 | |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame^] | 60 | Slot* Variable::AsSlot() const { return rewrite_; } |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 61 | |
| 62 | |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 63 | bool Variable::IsStackAllocated() const { |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame^] | 64 | return rewrite_ != NULL && rewrite_->IsStackAllocated(); |
Steve Block | 6ded16b | 2010-05-10 14:33:55 +0100 | [diff] [blame] | 65 | } |
| 66 | |
| 67 | |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 68 | bool Variable::IsParameter() const { |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame^] | 69 | return rewrite_ != NULL && rewrite_->type() == Slot::PARAMETER; |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 70 | } |
| 71 | |
| 72 | |
| 73 | bool Variable::IsStackLocal() const { |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame^] | 74 | return rewrite_ != NULL && rewrite_->type() == Slot::LOCAL; |
Ben Murdoch | b0fe162 | 2011-05-05 13:52:32 +0100 | [diff] [blame] | 75 | } |
| 76 | |
| 77 | |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 78 | bool Variable::IsContextSlot() const { |
Ben Murdoch | 3fb3ca8 | 2011-12-02 17:19:32 +0000 | [diff] [blame^] | 79 | return rewrite_ != NULL && rewrite_->type() == Slot::CONTEXT; |
Ben Murdoch | b8e0da2 | 2011-05-16 14:20:40 +0100 | [diff] [blame] | 80 | } |
| 81 | |
| 82 | |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 83 | Variable::Variable(Scope* scope, |
| 84 | Handle<String> name, |
| 85 | Mode mode, |
| 86 | bool is_valid_LHS, |
| 87 | Kind kind) |
| 88 | : scope_(scope), |
| 89 | name_(name), |
| 90 | mode_(mode), |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 91 | kind_(kind), |
| 92 | local_if_not_shadowed_(NULL), |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 93 | rewrite_(NULL), |
| 94 | is_valid_LHS_(is_valid_LHS), |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 95 | is_accessed_from_inner_scope_(false), |
Steve Block | 1e0659c | 2011-05-24 12:43:12 +0100 | [diff] [blame] | 96 | is_used_(false) { |
Steve Block | a7e24c1 | 2009-10-30 11:49:00 +0000 | [diff] [blame] | 97 | // names must be canonicalized for fast equality checks |
| 98 | ASSERT(name->IsSymbol()); |
| 99 | } |
| 100 | |
| 101 | |
| 102 | bool Variable::is_global() const { |
| 103 | // Temporaries are never global, they must always be allocated in the |
| 104 | // activation frame. |
| 105 | return mode_ != TEMPORARY && scope_ != NULL && scope_->is_global_scope(); |
| 106 | } |
| 107 | |
| 108 | } } // namespace v8::internal |