WIP: Parser: delay string internalization.

src/parser-symbol-table.h

+// Copyright 2014 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.
+
+#ifndef V8_PARSER_SYMBOL_TABLE_H_
+#define V8_PARSER_SYMBOL_TABLE_H_
+
+#include "api.h"
+#include "hashmap.h"
+#include "utils.h"
+
+namespace v8 {
+namespace internal {
+
+struct ParserSymbol {
+ public:
+  ParserSymbol(bool i, Vector<const byte> lb, int h)
+      : is_one_byte(i),
+        literal_bytes(lb),
+        hash(h) {}
+
+  ParserSymbol()
+      : is_one_byte(true),
+        hash(0) {}
+
+  V8_INLINE Handle<String> string() {
+    ASSERT(!string_.is_null());
+    return string_;
+  }
+
+  bool is_one_byte;
+  // Weak. Points to memory owned by ParserSymbolTable.
+  Vector<const byte> literal_bytes;
+  int hash;
+
+ private:
+  friend class ParserSymbolTable;
+  // This is null until the string is internalized.
+  Handle<String> string_;
+};
+
+
+class ParserSymbolTable {
+ public:
+  typedef ParserSymbol Symbol;
+
+  ParserSymbolTable();
+  Symbol* GetOneByteSymbol(Vector<const uint8_t> literal);
+  Symbol* GetTwoByteSymbol(Vector<const uint16_t> literal);
+  Symbol* GetSymbol(Handle<String> literal);
+
+  static bool SymbolMatches(Symbol* symbol, const char* data, int length);
+
+  void Internalize(Isolate* isolate);
+  void AlwaysInternalize(Isolate* isolate) {
+    isolate_ = isolate;
+    Internalize(isolate);
+  }
+
+  static bool IsArrayIndexSlow(Symbol* symbol, uint32_t* ix = NULL);
+
+  // Some constant strings which are always needed.
+  ParserSymbol* anonymous_function_string() const {
+    return anonymous_function_string_;
+  }
+  ParserSymbol* arguments_string() const {
+    return arguments_string_;
+  }
+  ParserSymbol* dot_for_string() const {
+    return dot_for_string_;
+  }
+  ParserSymbol* dot_iterator_string() const {
+    return dot_iterator_string_;
+  }
+  ParserSymbol* dot_module_string() const {
+    return dot_module_string_;
+  }
+  ParserSymbol* dot_result_string() const {
+    return dot_result_string_;
+  }
+  ParserSymbol* empty_string() const { return empty_string_; }
+  ParserSymbol* eval_string() const { return eval_string_; }
+  ParserSymbol* initialize_const_global_string() const {
+    return initialize_const_global_string_;
+  }
+  ParserSymbol* initialize_var_global_string() const {
+    return initialize_var_global_string_;
+  }
+  ParserSymbol* make_reference_error_string() const {
+    return make_reference_error_string_;
+  }
+  ParserSymbol* make_syntax_error_string() const {
+    return make_syntax_error_string_;
+  }
+  ParserSymbol* make_type_error_string() const {
+    return make_type_error_string_;
+  }
+  ParserSymbol* module_string() const {
+    return module_string_;
+  }
+  ParserSymbol* native_string() const {
+    return native_string_;
+  }
+  ParserSymbol* prototype_string() const {
+    return prototype_string_;
+  }
+  ParserSymbol* this_string() const { return this_string_; }
+  ParserSymbol* use_strict_string() const {
+    return use_strict_string_;
+  }
+
+ private:
+  Symbol* GetSymbol(int hash, bool is_one_byte,
+                    Vector<const byte> literal_bytes);
+
+  static void Internalize(Symbol* symbol, Isolate* isolate);
+
+  // All symbols are copied here, one after another.
+  Collector<byte> literal_chars_;
+  // List of all Symbols we have seen; keys of string_table_ are pointers into
+  // Symbols in symbol_keys_.
+  Collector<Symbol> symbol_keys_;
+  HashMap string_table_;
+  Isolate* isolate_;
+
+  // FIXME: these are easily created with a macro.
+  // FIXME: .generator
+  ParserSymbol* anonymous_function_string_;
+  ParserSymbol* arguments_string_;
+  ParserSymbol* dot_for_string_;
+  ParserSymbol* dot_iterator_string_;
+  ParserSymbol* dot_result_string_;
+  ParserSymbol* dot_module_string_;
+  ParserSymbol* empty_string_;
+  ParserSymbol* eval_string_;
+  ParserSymbol* initialize_const_global_string_;
+  ParserSymbol* initialize_var_global_string_;
+  ParserSymbol* make_reference_error_string_;
+  ParserSymbol* make_syntax_error_string_;
+  ParserSymbol* make_type_error_string_;
+  ParserSymbol* module_string_;
+  ParserSymbol* native_string_;
+  ParserSymbol* prototype_string_;
+  ParserSymbol* this_string_;
+  ParserSymbol* use_strict_string_;
+};
+
+} }  // namespace v8::internal
+
+#endif  // V8_PARSER_SYMBOL_TABLE_H_