Mercurial > jdk8-mips64-public > nashorn / file comparison
comparison: src/jdk/nashorn/internal/ir/Block.java
src/jdk/nashorn/internal/ir/Block.java
- changeset 1536
- bb0fac71c1da
- parent 1226
- 8b3f832bea55
- child 1959
- 61ffdd1b89f2
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| 1535:8f28ca037c57 | 1536:bb0fac71c1da |
|---|---|
| 128 public boolean isGlobalScope() { | 128 public boolean isGlobalScope() { |
| 129 return getFlag(IS_GLOBAL_SCOPE); | 129 return getFlag(IS_GLOBAL_SCOPE); |
| 130 } | 130 } |
| 131 | 131 |
| 132 /** | 132 /** |
| 133 * Clear the symbols in the block. | 133 * Returns true if this block defines any symbols. |
| 134 * TODO: make this immutable. | 134 * @return true if this block defines any symbols. |
| 135 */ | 135 */ |
| 136 public void clearSymbols() { | 136 public boolean hasSymbols() { |
| 137 symbols.clear(); | 137 return !symbols.isEmpty(); |
| 138 } | |
| 139 | |
| 140 /** | |
| 141 * Replaces symbols defined in this block with different symbols. Used to ensure symbol tables are | |
| 142 * immutable upon construction and have copy-on-write semantics. Note that this method only replaces the | |
| 143 * symbols in the symbol table, it does not act on any contained AST nodes that might reference the symbols. | |
| 144 * Those should be updated separately as this method is meant to be used as part of such an update pass. | |
| 145 * @param lc the current lexical context | |
| 146 * @param replacements the map of symbol replacements | |
| 147 * @return a new block with replaced symbols, or this block if none of the replacements modified the symbol | |
| 148 * table. | |
| 149 */ | |
| 150 public Block replaceSymbols(final LexicalContext lc, final Map<Symbol, Symbol> replacements) { | |
| 151 if (symbols.isEmpty()) { | |
| 152 return this; | |
| 153 } | |
| 154 final LinkedHashMap<String, Symbol> newSymbols = new LinkedHashMap<>(symbols); | |
| 155 for (final Map.Entry<String, Symbol> entry: newSymbols.entrySet()) { | |
| 156 final Symbol newSymbol = replacements.get(entry.getValue()); | |
| 157 assert newSymbol != null : "Missing replacement for " + entry.getKey(); | |
| 158 entry.setValue(newSymbol); | |
| 159 } | |
| 160 return Node.replaceInLexicalContext(lc, this, new Block(this, finish, statements, flags, newSymbols, conversion)); | |
| 161 } | |
| 162 | |
| 163 /** | |
| 164 * Returns a copy of this block with a shallow copy of the symbol table. | |
| 165 * @return a copy of this block with a shallow copy of the symbol table. | |
| 166 */ | |
| 167 public Block copyWithNewSymbols() { | |
| 168 return new Block(this, finish, statements, flags, new LinkedHashMap<>(symbols), conversion); | |
| 138 } | 169 } |
| 139 | 170 |
| 140 @Override | 171 @Override |
| 141 public Node ensureUniqueLabels(final LexicalContext lc) { | 172 public Node ensureUniqueLabels(final LexicalContext lc) { |
| 142 return Node.replaceInLexicalContext(lc, this, new Block(this, finish, statements, flags, symbols, conversion)); | 173 return Node.replaceInLexicalContext(lc, this, new Block(this, finish, statements, flags, symbols, conversion)); |
| 160 /** | 191 /** |
| 161 * Get a copy of the list for all the symbols defined in this block | 192 * Get a copy of the list for all the symbols defined in this block |
| 162 * @return symbol iterator | 193 * @return symbol iterator |
| 163 */ | 194 */ |
| 164 public List<Symbol> getSymbols() { | 195 public List<Symbol> getSymbols() { |
| 165 return Collections.unmodifiableList(new ArrayList<>(symbols.values())); | 196 return symbols.isEmpty() ? Collections.<Symbol>emptyList() : Collections.unmodifiableList(new ArrayList<>(symbols.values())); |
| 166 } | 197 } |
| 167 | 198 |
| 168 /** | 199 /** |
| 169 * Retrieves an existing symbol defined in the current block. | 200 * Retrieves an existing symbol defined in the current block. |
| 170 * @param name the name of the symbol | 201 * @param name the name of the symbol |
| 324 } | 355 } |
| 325 | 356 |
| 326 /** | 357 /** |
| 327 * Add or overwrite an existing symbol in the block | 358 * Add or overwrite an existing symbol in the block |
| 328 * | 359 * |
| 329 * @param lc get lexical context | |
| 330 * @param symbol symbol | 360 * @param symbol symbol |
| 331 */ | 361 */ |
| 332 public void putSymbol(final LexicalContext lc, final Symbol symbol) { | 362 public void putSymbol(final Symbol symbol) { |
| 333 symbols.put(symbol.getName(), symbol); | 363 symbols.put(symbol.getName(), symbol); |
| 334 } | 364 } |
| 335 | 365 |
| 336 /** | 366 /** |
| 337 * Check whether scope is necessary for this Block | 367 * Check whether scope is necessary for this Block |
