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+// Copyright 2006-2008 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following
+// disclaimer in the documentation and/or other materials provided
+// with the distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "v8.h"
+
+#include "ast.h"
+#include "scopes.h"
+#include "variables.h"
+
+namespace v8 {
+namespace internal {
+
+// ----------------------------------------------------------------------------
+// Implementation StaticType.
+
+
+const char* StaticType::Type2String(StaticType* type) {
+ switch (type->kind_) {
+ case UNKNOWN:
+ return "UNKNOWN";
+ case LIKELY_SMI:
+ return "LIKELY_SMI";
+ default:
+ UNREACHABLE();
+ }
+ return "UNREACHABLE";
+}
+
+
+// ----------------------------------------------------------------------------
+// Implementation Variable.
+
+
+const char* Variable::Mode2String(Mode mode) {
+ switch (mode) {
+ case VAR: return "VAR";
+ case CONST: return "CONST";
+ case DYNAMIC: return "DYNAMIC";
+ case DYNAMIC_GLOBAL: return "DYNAMIC_GLOBAL";
+ case DYNAMIC_LOCAL: return "DYNAMIC_LOCAL";
+ case INTERNAL: return "INTERNAL";
+ case TEMPORARY: return "TEMPORARY";
+ }
+ UNREACHABLE();
+ return NULL;
+}
+
+
+Property* Variable::AsProperty() const {
+ return rewrite_ == NULL ? NULL : rewrite_->AsProperty();
+}
+
+
+Slot* Variable::AsSlot() const {
+ return rewrite_ == NULL ? NULL : rewrite_->AsSlot();
+}
+
+
+bool Variable::IsStackAllocated() const {
+ Slot* slot = AsSlot();
+ return slot != NULL && slot->IsStackAllocated();
+}
+
+
+bool Variable::IsParameter() const {
+ Slot* s = AsSlot();
+ return s != NULL && s->type() == Slot::PARAMETER;
+}
+
+
+bool Variable::IsStackLocal() const {
+ Slot* s = AsSlot();
+ return s != NULL && s->type() == Slot::LOCAL;
+}
+
+
+bool Variable::IsContextSlot() const {
+ Slot* s = AsSlot();
+ return s != NULL && s->type() == Slot::CONTEXT;
+}
+
+
+Variable::Variable(Scope* scope,
+ Handle<String> name,
+ Mode mode,
+ bool is_valid_LHS,
+ Kind kind)
+ : scope_(scope),
+ name_(name),
+ mode_(mode),
+ kind_(kind),
+ local_if_not_shadowed_(NULL),
+ rewrite_(NULL),
+ is_valid_LHS_(is_valid_LHS),
+ is_accessed_from_inner_scope_(false),
+ is_used_(false) {
+ // names must be canonicalized for fast equality checks
+ ASSERT(name->IsSymbol());
+}
+
+
+bool Variable::is_global() const {
+ // Temporaries are never global, they must always be allocated in the
+ // activation frame.
+ return mode_ != TEMPORARY && scope_ != NULL && scope_->is_global_scope();
+}
+
+} } // namespace v8::internal