author | jjg |
Thu, 25 Feb 2010 12:26:39 -0800 | |
changeset 5004 | 6c2694dc2da0 |
parent 2723 | b659ca23d5f5 |
child 5520 | 86e4b9a9da40 |
permissions | -rw-r--r-- |
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/* |
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* Copyright 1999-2008 Sun Microsystems, Inc. All Rights Reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Sun designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Sun in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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*/ |
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package com.sun.tools.javac.jvm; |
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import com.sun.tools.javac.code.*; |
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import com.sun.tools.javac.code.Symbol.*; |
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import com.sun.tools.javac.code.Type.*; |
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import com.sun.tools.javac.jvm.Code.*; |
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import com.sun.tools.javac.tree.JCTree; |
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import static com.sun.tools.javac.jvm.ByteCodes.*; |
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/** A helper class for code generation. Items are objects |
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* that stand for addressable entities in the bytecode. Each item |
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* supports a fixed protocol for loading the item on the stack, storing |
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* into it, converting it into a jump condition, and several others. |
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* There are many individual forms of items, such as local, static, |
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* indexed, or instance variables, values on the top of stack, the |
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* special values this or super, etc. Individual items are represented as |
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* inner classes in class Items. |
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* |
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* <p><b>This is NOT part of any API supported by Sun Microsystems. If |
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* you write code that depends on this, you do so at your own risk. |
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* This code and its internal interfaces are subject to change or |
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* deletion without notice.</b> |
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*/ |
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public class Items { |
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/** The current constant pool. |
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*/ |
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Pool pool; |
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/** The current code buffer. |
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*/ |
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Code code; |
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/** The current symbol table. |
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*/ |
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Symtab syms; |
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/** Type utilities. */ |
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Types types; |
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/** Items that exist only once (flyweight pattern). |
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*/ |
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private final Item voidItem; |
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private final Item thisItem; |
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private final Item superItem; |
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private final Item[] stackItem = new Item[TypeCodeCount]; |
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public Items(Pool pool, Code code, Symtab syms, Types types) { |
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this.code = code; |
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this.pool = pool; |
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this.types = types; |
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voidItem = new Item(VOIDcode) { |
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public String toString() { return "void"; } |
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}; |
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thisItem = new SelfItem(false); |
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superItem = new SelfItem(true); |
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for (int i = 0; i < VOIDcode; i++) stackItem[i] = new StackItem(i); |
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stackItem[VOIDcode] = voidItem; |
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this.syms = syms; |
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} |
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/** Make a void item |
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*/ |
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Item makeVoidItem() { |
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return voidItem; |
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} |
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/** Make an item representing `this'. |
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*/ |
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Item makeThisItem() { |
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return thisItem; |
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} |
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/** Make an item representing `super'. |
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*/ |
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Item makeSuperItem() { |
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return superItem; |
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} |
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/** Make an item representing a value on stack. |
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* @param type The value's type. |
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*/ |
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Item makeStackItem(Type type) { |
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return stackItem[Code.typecode(type)]; |
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} |
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/** Make an item representing an indexed expression. |
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* @param type The expression's type. |
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*/ |
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Item makeIndexedItem(Type type) { |
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return new IndexedItem(type); |
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} |
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/** Make an item representing a local variable. |
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* @param v The represented variable. |
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*/ |
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LocalItem makeLocalItem(VarSymbol v) { |
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return new LocalItem(v.erasure(types), v.adr); |
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} |
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/** Make an item representing a local anonymous variable. |
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* @param type The represented variable's type. |
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* @param reg The represented variable's register. |
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*/ |
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private LocalItem makeLocalItem(Type type, int reg) { |
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return new LocalItem(type, reg); |
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} |
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/** Make an item representing a static variable or method. |
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* @param member The represented symbol. |
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*/ |
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Item makeStaticItem(Symbol member) { |
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return new StaticItem(member); |
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} |
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/** Make an item representing a dynamically invoked method. |
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* @param member The represented symbol. |
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*/ |
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Item makeDynamicItem(Symbol member) { |
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return new DynamicItem(member); |
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} |
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/** Make an item representing an instance variable or method. |
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* @param member The represented symbol. |
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* @param nonvirtual Is the reference not virtual? (true for constructors |
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* and private members). |
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*/ |
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Item makeMemberItem(Symbol member, boolean nonvirtual) { |
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return new MemberItem(member, nonvirtual); |
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} |
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/** Make an item representing a literal. |
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* @param type The literal's type. |
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* @param value The literal's value. |
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*/ |
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Item makeImmediateItem(Type type, Object value) { |
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return new ImmediateItem(type, value); |
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} |
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/** Make an item representing an assignment expression. |
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* @param lhs The item representing the assignment's left hand side. |
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*/ |
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Item makeAssignItem(Item lhs) { |
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return new AssignItem(lhs); |
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} |
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/** Make an item representing a conditional or unconditional jump. |
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* @param opcode The jump's opcode. |
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* @param trueJumps A chain encomassing all jumps that can be taken |
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* if the condition evaluates to true. |
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* @param falseJumps A chain encomassing all jumps that can be taken |
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* if the condition evaluates to false. |
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*/ |
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CondItem makeCondItem(int opcode, Chain trueJumps, Chain falseJumps) { |
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return new CondItem(opcode, trueJumps, falseJumps); |
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} |
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/** Make an item representing a conditional or unconditional jump. |
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* @param opcode The jump's opcode. |
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*/ |
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CondItem makeCondItem(int opcode) { |
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return makeCondItem(opcode, null, null); |
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} |
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/** The base class of all items, which implements default behavior. |
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*/ |
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abstract class Item { |
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/** The type code of values represented by this item. |
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*/ |
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int typecode; |
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Item(int typecode) { |
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this.typecode = typecode; |
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} |
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/** Generate code to load this item onto stack. |
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*/ |
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Item load() { |
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throw new AssertionError(); |
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} |
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/** Generate code to store top of stack into this item. |
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*/ |
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void store() { |
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throw new AssertionError("store unsupported: " + this); |
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} |
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/** Generate code to invoke method represented by this item. |
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*/ |
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Item invoke() { |
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throw new AssertionError(this); |
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} |
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/** Generate code to use this item twice. |
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*/ |
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void duplicate() {} |
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/** Generate code to avoid having to use this item. |
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*/ |
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void drop() {} |
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/** Generate code to stash a copy of top of stack - of typecode toscode - |
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* under this item. |
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*/ |
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void stash(int toscode) { |
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stackItem[toscode].duplicate(); |
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} |
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/** Generate code to turn item into a testable condition. |
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*/ |
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CondItem mkCond() { |
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load(); |
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return makeCondItem(ifne); |
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} |
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/** Generate code to coerce item to given type code. |
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* @param targetcode The type code to coerce to. |
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*/ |
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Item coerce(int targetcode) { |
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if (typecode == targetcode) |
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return this; |
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else { |
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load(); |
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int typecode1 = Code.truncate(typecode); |
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int targetcode1 = Code.truncate(targetcode); |
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if (typecode1 != targetcode1) { |
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int offset = targetcode1 > typecode1 ? targetcode1 - 1 |
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: targetcode1; |
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code.emitop0(i2l + typecode1 * 3 + offset); |
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} |
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if (targetcode != targetcode1) { |
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code.emitop0(int2byte + targetcode - BYTEcode); |
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} |
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return stackItem[targetcode]; |
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} |
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} |
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/** Generate code to coerce item to given type. |
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* @param targettype The type to coerce to. |
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*/ |
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Item coerce(Type targettype) { |
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return coerce(Code.typecode(targettype)); |
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} |
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/** Return the width of this item on stack as a number of words. |
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*/ |
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int width() { |
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return 0; |
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} |
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public abstract String toString(); |
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} |
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/** An item representing a value on stack. |
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*/ |
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class StackItem extends Item { |
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StackItem(int typecode) { |
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super(typecode); |
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} |
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Item load() { |
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return this; |
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} |
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void duplicate() { |
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code.emitop0(width() == 2 ? dup2 : dup); |
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} |
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void drop() { |
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code.emitop0(width() == 2 ? pop2 : pop); |
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} |
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void stash(int toscode) { |
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code.emitop0( |
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(width() == 2 ? dup_x2 : dup_x1) + 3 * (Code.width(toscode) - 1)); |
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} |
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int width() { |
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return Code.width(typecode); |
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} |
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public String toString() { |
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return "stack(" + typecodeNames[typecode] + ")"; |
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} |
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} |
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/** An item representing an indexed expression. |
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*/ |
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class IndexedItem extends Item { |
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IndexedItem(Type type) { |
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super(Code.typecode(type)); |
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} |
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Item load() { |
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code.emitop0(iaload + typecode); |
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return stackItem[typecode]; |
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} |
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void store() { |
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code.emitop0(iastore + typecode); |
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} |
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void duplicate() { |
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code.emitop0(dup2); |
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} |
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void drop() { |
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code.emitop0(pop2); |
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} |
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void stash(int toscode) { |
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code.emitop0(dup_x2 + 3 * (Code.width(toscode) - 1)); |
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} |
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int width() { |
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return 2; |
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} |
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||
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public String toString() { |
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return "indexed(" + ByteCodes.typecodeNames[typecode] + ")"; |
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} |
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} |
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/** An item representing `this' or `super'. |
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*/ |
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class SelfItem extends Item { |
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/** Flag which determines whether this item represents `this' or `super'. |
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*/ |
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boolean isSuper; |
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SelfItem(boolean isSuper) { |
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super(OBJECTcode); |
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this.isSuper = isSuper; |
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} |
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||
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Item load() { |
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code.emitop0(aload_0); |
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return stackItem[typecode]; |
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} |
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public String toString() { |
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return isSuper ? "super" : "this"; |
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} |
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} |
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||
376 |
/** An item representing a local variable. |
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*/ |
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class LocalItem extends Item { |
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380 |
/** The variable's register. |
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*/ |
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int reg; |
|
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||
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/** The variable's type. |
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*/ |
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Type type; |
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387 |
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LocalItem(Type type, int reg) { |
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super(Code.typecode(type)); |
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assert reg >= 0; |
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this.type = type; |
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this.reg = reg; |
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} |
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||
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Item load() { |
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if (reg <= 3) |
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code.emitop0(iload_0 + Code.truncate(typecode) * 4 + reg); |
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else |
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code.emitop1w(iload + Code.truncate(typecode), reg); |
|
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return stackItem[typecode]; |
|
401 |
} |
|
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||
403 |
void store() { |
|
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if (reg <= 3) |
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code.emitop0(istore_0 + Code.truncate(typecode) * 4 + reg); |
|
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else |
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code.emitop1w(istore + Code.truncate(typecode), reg); |
|
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code.setDefined(reg); |
|
409 |
} |
|
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||
411 |
void incr(int x) { |
|
412 |
if (typecode == INTcode && x >= -32768 && x <= 32767) { |
|
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code.emitop1w(iinc, reg, x); |
|
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} else { |
|
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load(); |
|
416 |
if (x >= 0) { |
|
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makeImmediateItem(syms.intType, x).load(); |
|
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code.emitop0(iadd); |
|
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} else { |
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makeImmediateItem(syms.intType, -x).load(); |
|
421 |
code.emitop0(isub); |
|
422 |
} |
|
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makeStackItem(syms.intType).coerce(typecode); |
|
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store(); |
|
425 |
} |
|
426 |
} |
|
427 |
||
428 |
public String toString() { |
|
429 |
return "localItem(type=" + type + "; reg=" + reg + ")"; |
|
430 |
} |
|
431 |
} |
|
432 |
||
433 |
/** An item representing a static variable or method. |
|
434 |
*/ |
|
435 |
class StaticItem extends Item { |
|
436 |
||
437 |
/** The represented symbol. |
|
438 |
*/ |
|
439 |
Symbol member; |
|
440 |
||
441 |
StaticItem(Symbol member) { |
|
442 |
super(Code.typecode(member.erasure(types))); |
|
443 |
this.member = member; |
|
444 |
} |
|
445 |
||
446 |
Item load() { |
|
447 |
code.emitop2(getstatic, pool.put(member)); |
|
448 |
return stackItem[typecode]; |
|
449 |
} |
|
450 |
||
451 |
void store() { |
|
452 |
code.emitop2(putstatic, pool.put(member)); |
|
453 |
} |
|
454 |
||
455 |
Item invoke() { |
|
456 |
MethodType mtype = (MethodType)member.erasure(types); |
|
457 |
int rescode = Code.typecode(mtype.restype); |
|
458 |
code.emitInvokestatic(pool.put(member), mtype); |
|
459 |
return stackItem[rescode]; |
|
460 |
} |
|
461 |
||
462 |
public String toString() { |
|
463 |
return "static(" + member + ")"; |
|
464 |
} |
|
465 |
} |
|
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/** An item representing a dynamic call site. |
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*/ |
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class DynamicItem extends StaticItem { |
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DynamicItem(Symbol member) { |
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super(member); |
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assert member.owner == syms.invokeDynamicType.tsym; |
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} |
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Item load() { |
b659ca23d5f5
6829189: Java programming with JSR 292 needs language support
jrose
parents:
1264
diff
changeset
|
476 |
assert false; |
b659ca23d5f5
6829189: Java programming with JSR 292 needs language support
jrose
parents:
1264
diff
changeset
|
477 |
return null; |
b659ca23d5f5
6829189: Java programming with JSR 292 needs language support
jrose
parents:
1264
diff
changeset
|
478 |
} |
b659ca23d5f5
6829189: Java programming with JSR 292 needs language support
jrose
parents:
1264
diff
changeset
|
479 |
|
b659ca23d5f5
6829189: Java programming with JSR 292 needs language support
jrose
parents:
1264
diff
changeset
|
480 |
void store() { |
b659ca23d5f5
6829189: Java programming with JSR 292 needs language support
jrose
parents:
1264
diff
changeset
|
481 |
assert false; |
b659ca23d5f5
6829189: Java programming with JSR 292 needs language support
jrose
parents:
1264
diff
changeset
|
482 |
} |
b659ca23d5f5
6829189: Java programming with JSR 292 needs language support
jrose
parents:
1264
diff
changeset
|
483 |
|
b659ca23d5f5
6829189: Java programming with JSR 292 needs language support
jrose
parents:
1264
diff
changeset
|
484 |
Item invoke() { |
b659ca23d5f5
6829189: Java programming with JSR 292 needs language support
jrose
parents:
1264
diff
changeset
|
485 |
// assert target.hasNativeInvokeDynamic(); |
b659ca23d5f5
6829189: Java programming with JSR 292 needs language support
jrose
parents:
1264
diff
changeset
|
486 |
MethodType mtype = (MethodType)member.erasure(types); |
b659ca23d5f5
6829189: Java programming with JSR 292 needs language support
jrose
parents:
1264
diff
changeset
|
487 |
int rescode = Code.typecode(mtype.restype); |
b659ca23d5f5
6829189: Java programming with JSR 292 needs language support
jrose
parents:
1264
diff
changeset
|
488 |
ClassFile.NameAndType descr = new ClassFile.NameAndType(member.name, mtype); |
b659ca23d5f5
6829189: Java programming with JSR 292 needs language support
jrose
parents:
1264
diff
changeset
|
489 |
code.emitInvokedynamic(pool.put(descr), mtype); |
b659ca23d5f5
6829189: Java programming with JSR 292 needs language support
jrose
parents:
1264
diff
changeset
|
490 |
return stackItem[rescode]; |
b659ca23d5f5
6829189: Java programming with JSR 292 needs language support
jrose
parents:
1264
diff
changeset
|
491 |
} |
b659ca23d5f5
6829189: Java programming with JSR 292 needs language support
jrose
parents:
1264
diff
changeset
|
492 |
|
b659ca23d5f5
6829189: Java programming with JSR 292 needs language support
jrose
parents:
1264
diff
changeset
|
493 |
public String toString() { |
b659ca23d5f5
6829189: Java programming with JSR 292 needs language support
jrose
parents:
1264
diff
changeset
|
494 |
return "dynamic(" + member + ")"; |
b659ca23d5f5
6829189: Java programming with JSR 292 needs language support
jrose
parents:
1264
diff
changeset
|
495 |
} |
b659ca23d5f5
6829189: Java programming with JSR 292 needs language support
jrose
parents:
1264
diff
changeset
|
496 |
} |
b659ca23d5f5
6829189: Java programming with JSR 292 needs language support
jrose
parents:
1264
diff
changeset
|
497 |
|
b659ca23d5f5
6829189: Java programming with JSR 292 needs language support
jrose
parents:
1264
diff
changeset
|
498 |
|
10 | 499 |
/** An item representing an instance variable or method. |
500 |
*/ |
|
501 |
class MemberItem extends Item { |
|
502 |
||
503 |
/** The represented symbol. |
|
504 |
*/ |
|
505 |
Symbol member; |
|
506 |
||
507 |
/** Flag that determines whether or not access is virtual. |
|
508 |
*/ |
|
509 |
boolean nonvirtual; |
|
510 |
||
511 |
MemberItem(Symbol member, boolean nonvirtual) { |
|
512 |
super(Code.typecode(member.erasure(types))); |
|
513 |
this.member = member; |
|
514 |
this.nonvirtual = nonvirtual; |
|
515 |
} |
|
516 |
||
517 |
Item load() { |
|
518 |
code.emitop2(getfield, pool.put(member)); |
|
519 |
return stackItem[typecode]; |
|
520 |
} |
|
521 |
||
522 |
void store() { |
|
523 |
code.emitop2(putfield, pool.put(member)); |
|
524 |
} |
|
525 |
||
526 |
Item invoke() { |
|
527 |
MethodType mtype = (MethodType)member.externalType(types); |
|
528 |
int rescode = Code.typecode(mtype.restype); |
|
529 |
if ((member.owner.flags() & Flags.INTERFACE) != 0) { |
|
530 |
code.emitInvokeinterface(pool.put(member), mtype); |
|
531 |
} else if (nonvirtual) { |
|
532 |
code.emitInvokespecial(pool.put(member), mtype); |
|
533 |
} else { |
|
534 |
code.emitInvokevirtual(pool.put(member), mtype); |
|
535 |
} |
|
536 |
return stackItem[rescode]; |
|
537 |
} |
|
538 |
||
539 |
void duplicate() { |
|
540 |
stackItem[OBJECTcode].duplicate(); |
|
541 |
} |
|
542 |
||
543 |
void drop() { |
|
544 |
stackItem[OBJECTcode].drop(); |
|
545 |
} |
|
546 |
||
547 |
void stash(int toscode) { |
|
548 |
stackItem[OBJECTcode].stash(toscode); |
|
549 |
} |
|
550 |
||
551 |
int width() { |
|
552 |
return 1; |
|
553 |
} |
|
554 |
||
555 |
public String toString() { |
|
556 |
return "member(" + member + (nonvirtual ? " nonvirtual)" : ")"); |
|
557 |
} |
|
558 |
} |
|
559 |
||
560 |
/** An item representing a literal. |
|
561 |
*/ |
|
562 |
class ImmediateItem extends Item { |
|
563 |
||
564 |
/** The literal's value. |
|
565 |
*/ |
|
566 |
Object value; |
|
567 |
||
568 |
ImmediateItem(Type type, Object value) { |
|
569 |
super(Code.typecode(type)); |
|
570 |
this.value = value; |
|
571 |
} |
|
572 |
||
573 |
private void ldc() { |
|
574 |
int idx = pool.put(value); |
|
575 |
if (typecode == LONGcode || typecode == DOUBLEcode) { |
|
576 |
code.emitop2(ldc2w, idx); |
|
577 |
} else if (idx <= 255) { |
|
578 |
code.emitop1(ldc1, idx); |
|
579 |
} else { |
|
580 |
code.emitop2(ldc2, idx); |
|
581 |
} |
|
582 |
} |
|
583 |
||
584 |
Item load() { |
|
585 |
switch (typecode) { |
|
586 |
case INTcode: case BYTEcode: case SHORTcode: case CHARcode: |
|
587 |
int ival = ((Number)value).intValue(); |
|
588 |
if (-1 <= ival && ival <= 5) |
|
589 |
code.emitop0(iconst_0 + ival); |
|
590 |
else if (Byte.MIN_VALUE <= ival && ival <= Byte.MAX_VALUE) |
|
591 |
code.emitop1(bipush, ival); |
|
592 |
else if (Short.MIN_VALUE <= ival && ival <= Short.MAX_VALUE) |
|
593 |
code.emitop2(sipush, ival); |
|
594 |
else |
|
595 |
ldc(); |
|
596 |
break; |
|
597 |
case LONGcode: |
|
598 |
long lval = ((Number)value).longValue(); |
|
599 |
if (lval == 0 || lval == 1) |
|
600 |
code.emitop0(lconst_0 + (int)lval); |
|
601 |
else |
|
602 |
ldc(); |
|
603 |
break; |
|
604 |
case FLOATcode: |
|
605 |
float fval = ((Number)value).floatValue(); |
|
606 |
if (isPosZero(fval) || fval == 1.0 || fval == 2.0) |
|
607 |
code.emitop0(fconst_0 + (int)fval); |
|
608 |
else { |
|
609 |
ldc(); |
|
610 |
} |
|
611 |
break; |
|
612 |
case DOUBLEcode: |
|
613 |
double dval = ((Number)value).doubleValue(); |
|
614 |
if (isPosZero(dval) || dval == 1.0) |
|
615 |
code.emitop0(dconst_0 + (int)dval); |
|
616 |
else |
|
617 |
ldc(); |
|
618 |
break; |
|
619 |
case OBJECTcode: |
|
620 |
ldc(); |
|
621 |
break; |
|
622 |
default: |
|
623 |
assert false; |
|
624 |
} |
|
625 |
return stackItem[typecode]; |
|
626 |
} |
|
627 |
//where |
|
628 |
/** Return true iff float number is positive 0. |
|
629 |
*/ |
|
630 |
private boolean isPosZero(float x) { |
|
631 |
return x == 0.0f && 1.0f / x > 0.0f; |
|
632 |
} |
|
633 |
/** Return true iff double number is positive 0. |
|
634 |
*/ |
|
635 |
private boolean isPosZero(double x) { |
|
636 |
return x == 0.0d && 1.0d / x > 0.0d; |
|
637 |
} |
|
638 |
||
639 |
CondItem mkCond() { |
|
640 |
int ival = ((Number)value).intValue(); |
|
641 |
return makeCondItem(ival != 0 ? goto_ : dontgoto); |
|
642 |
} |
|
643 |
||
644 |
Item coerce(int targetcode) { |
|
645 |
if (typecode == targetcode) { |
|
646 |
return this; |
|
647 |
} else { |
|
648 |
switch (targetcode) { |
|
649 |
case INTcode: |
|
650 |
if (Code.truncate(typecode) == INTcode) |
|
651 |
return this; |
|
652 |
else |
|
653 |
return new ImmediateItem( |
|
654 |
syms.intType, |
|
655 |
((Number)value).intValue()); |
|
656 |
case LONGcode: |
|
657 |
return new ImmediateItem( |
|
658 |
syms.longType, |
|
659 |
((Number)value).longValue()); |
|
660 |
case FLOATcode: |
|
661 |
return new ImmediateItem( |
|
662 |
syms.floatType, |
|
663 |
((Number)value).floatValue()); |
|
664 |
case DOUBLEcode: |
|
665 |
return new ImmediateItem( |
|
666 |
syms.doubleType, |
|
667 |
((Number)value).doubleValue()); |
|
668 |
case BYTEcode: |
|
669 |
return new ImmediateItem( |
|
670 |
syms.byteType, |
|
671 |
(int)(byte)((Number)value).intValue()); |
|
672 |
case CHARcode: |
|
673 |
return new ImmediateItem( |
|
674 |
syms.charType, |
|
675 |
(int)(char)((Number)value).intValue()); |
|
676 |
case SHORTcode: |
|
677 |
return new ImmediateItem( |
|
678 |
syms.shortType, |
|
679 |
(int)(short)((Number)value).intValue()); |
|
680 |
default: |
|
681 |
return super.coerce(targetcode); |
|
682 |
} |
|
683 |
} |
|
684 |
} |
|
685 |
||
686 |
public String toString() { |
|
687 |
return "immediate(" + value + ")"; |
|
688 |
} |
|
689 |
} |
|
690 |
||
691 |
/** An item representing an assignment expressions. |
|
692 |
*/ |
|
693 |
class AssignItem extends Item { |
|
694 |
||
695 |
/** The item representing the assignment's left hand side. |
|
696 |
*/ |
|
697 |
Item lhs; |
|
698 |
||
699 |
AssignItem(Item lhs) { |
|
700 |
super(lhs.typecode); |
|
701 |
this.lhs = lhs; |
|
702 |
} |
|
703 |
||
704 |
Item load() { |
|
705 |
lhs.stash(typecode); |
|
706 |
lhs.store(); |
|
707 |
return stackItem[typecode]; |
|
708 |
} |
|
709 |
||
710 |
void duplicate() { |
|
711 |
load().duplicate(); |
|
712 |
} |
|
713 |
||
714 |
void drop() { |
|
715 |
lhs.store(); |
|
716 |
} |
|
717 |
||
718 |
void stash(int toscode) { |
|
719 |
assert false; |
|
720 |
} |
|
721 |
||
722 |
int width() { |
|
723 |
return lhs.width() + Code.width(typecode); |
|
724 |
} |
|
725 |
||
726 |
public String toString() { |
|
727 |
return "assign(lhs = " + lhs + ")"; |
|
728 |
} |
|
729 |
} |
|
730 |
||
731 |
/** An item representing a conditional or unconditional jump. |
|
732 |
*/ |
|
733 |
class CondItem extends Item { |
|
734 |
||
735 |
/** A chain encomassing all jumps that can be taken |
|
736 |
* if the condition evaluates to true. |
|
737 |
*/ |
|
738 |
Chain trueJumps; |
|
739 |
||
740 |
/** A chain encomassing all jumps that can be taken |
|
741 |
* if the condition evaluates to false. |
|
742 |
*/ |
|
743 |
Chain falseJumps; |
|
744 |
||
745 |
/** The jump's opcode. |
|
746 |
*/ |
|
747 |
int opcode; |
|
748 |
||
749 |
/* |
|
750 |
* An abstract syntax tree of this item. It is needed |
|
751 |
* for branch entries in 'CharacterRangeTable' attribute. |
|
752 |
*/ |
|
753 |
JCTree tree; |
|
754 |
||
755 |
CondItem(int opcode, Chain truejumps, Chain falsejumps) { |
|
756 |
super(BYTEcode); |
|
757 |
this.opcode = opcode; |
|
758 |
this.trueJumps = truejumps; |
|
759 |
this.falseJumps = falsejumps; |
|
760 |
} |
|
761 |
||
762 |
Item load() { |
|
763 |
Chain trueChain = null; |
|
764 |
Chain falseChain = jumpFalse(); |
|
765 |
if (!isFalse()) { |
|
766 |
code.resolve(trueJumps); |
|
767 |
code.emitop0(iconst_1); |
|
768 |
trueChain = code.branch(goto_); |
|
769 |
} |
|
770 |
if (falseChain != null) { |
|
771 |
code.resolve(falseChain); |
|
772 |
code.emitop0(iconst_0); |
|
773 |
} |
|
774 |
code.resolve(trueChain); |
|
775 |
return stackItem[typecode]; |
|
776 |
} |
|
777 |
||
778 |
void duplicate() { |
|
779 |
load().duplicate(); |
|
780 |
} |
|
781 |
||
782 |
void drop() { |
|
783 |
load().drop(); |
|
784 |
} |
|
785 |
||
786 |
void stash(int toscode) { |
|
787 |
assert false; |
|
788 |
} |
|
789 |
||
790 |
CondItem mkCond() { |
|
791 |
return this; |
|
792 |
} |
|
793 |
||
794 |
Chain jumpTrue() { |
|
5004
6c2694dc2da0
6929544: langtools source code uses statics qualified by instance variables
jjg
parents:
2723
diff
changeset
|
795 |
if (tree == null) return Code.mergeChains(trueJumps, code.branch(opcode)); |
10 | 796 |
// we should proceed further in -Xjcov mode only |
797 |
int startpc = code.curPc(); |
|
5004
6c2694dc2da0
6929544: langtools source code uses statics qualified by instance variables
jjg
parents:
2723
diff
changeset
|
798 |
Chain c = Code.mergeChains(trueJumps, code.branch(opcode)); |
10 | 799 |
code.crt.put(tree, CRTable.CRT_BRANCH_TRUE, startpc, code.curPc()); |
800 |
return c; |
|
801 |
} |
|
802 |
||
803 |
Chain jumpFalse() { |
|
5004
6c2694dc2da0
6929544: langtools source code uses statics qualified by instance variables
jjg
parents:
2723
diff
changeset
|
804 |
if (tree == null) return Code.mergeChains(falseJumps, code.branch(Code.negate(opcode))); |
10 | 805 |
// we should proceed further in -Xjcov mode only |
806 |
int startpc = code.curPc(); |
|
5004
6c2694dc2da0
6929544: langtools source code uses statics qualified by instance variables
jjg
parents:
2723
diff
changeset
|
807 |
Chain c = Code.mergeChains(falseJumps, code.branch(Code.negate(opcode))); |
10 | 808 |
code.crt.put(tree, CRTable.CRT_BRANCH_FALSE, startpc, code.curPc()); |
809 |
return c; |
|
810 |
} |
|
811 |
||
812 |
CondItem negate() { |
|
5004
6c2694dc2da0
6929544: langtools source code uses statics qualified by instance variables
jjg
parents:
2723
diff
changeset
|
813 |
CondItem c = new CondItem(Code.negate(opcode), falseJumps, trueJumps); |
10 | 814 |
c.tree = tree; |
815 |
return c; |
|
816 |
} |
|
817 |
||
818 |
int width() { |
|
819 |
// a CondItem doesn't have a size on the stack per se. |
|
820 |
throw new AssertionError(); |
|
821 |
} |
|
822 |
||
823 |
boolean isTrue() { |
|
824 |
return falseJumps == null && opcode == goto_; |
|
825 |
} |
|
826 |
||
827 |
boolean isFalse() { |
|
828 |
return trueJumps == null && opcode == dontgoto; |
|
829 |
} |
|
830 |
||
831 |
public String toString() { |
|
832 |
return "cond(" + Code.mnem(opcode) + ")"; |
|
833 |
} |
|
834 |
} |
|
835 |
} |