e8bccc2cb0
This implements block scoped 'const' declared variables in harmony mode. They have a temporal dead zone semantics similar to 'let' bindings, i.e. accessing uninitialized 'const' bindings in throws a ReferenceError. As for 'let' bindings, the semantics of 'const' bindings in global scope is not correctly implemented yet. Furthermore assignments to 'const's are silently ignored. Another CL will introduce treatment of those assignments as early errors. Review URL: http://codereview.chromium.org/7992005 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@9764 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
84 lines
3.0 KiB
C++
84 lines
3.0 KiB
C++
// Copyright 2011 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "v8.h"
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#include "ast.h"
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#include "scopes.h"
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#include "variables.h"
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namespace v8 {
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namespace internal {
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// ----------------------------------------------------------------------------
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// Implementation Variable.
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const char* Variable::Mode2String(VariableMode mode) {
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switch (mode) {
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case VAR: return "VAR";
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case CONST: return "CONST";
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case CONST_HARMONY: return "CONST";
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case LET: return "LET";
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case DYNAMIC: return "DYNAMIC";
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case DYNAMIC_GLOBAL: return "DYNAMIC_GLOBAL";
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case DYNAMIC_LOCAL: return "DYNAMIC_LOCAL";
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case INTERNAL: return "INTERNAL";
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case TEMPORARY: return "TEMPORARY";
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}
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UNREACHABLE();
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return NULL;
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}
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Variable::Variable(Scope* scope,
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Handle<String> name,
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VariableMode mode,
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bool is_valid_LHS,
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Kind kind)
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: scope_(scope),
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name_(name),
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mode_(mode),
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kind_(kind),
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location_(UNALLOCATED),
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index_(-1),
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local_if_not_shadowed_(NULL),
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is_valid_LHS_(is_valid_LHS),
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is_accessed_from_inner_scope_(false),
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is_used_(false) {
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// names must be canonicalized for fast equality checks
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ASSERT(name->IsSymbol());
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}
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bool Variable::is_global() const {
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// Temporaries are never global, they must always be allocated in the
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// activation frame.
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return mode_ != TEMPORARY && scope_ != NULL && scope_->is_global_scope();
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}
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} } // namespace v8::internal
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