| /* |
| * Copyright (c) 1994, 2003, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package sun.tools.tree; |
| |
| import sun.tools.java.*; |
| import sun.tools.asm.Assembler; |
| import sun.tools.asm.LocalVariable; |
| import java.io.PrintStream; |
| import java.util.Hashtable; |
| |
| /** |
| * WARNING: The contents of this source file are not part of any |
| * supported API. Code that depends on them does so at its own risk: |
| * they are subject to change or removal without notice. |
| */ |
| public |
| class VarDeclarationStatement extends Statement { |
| LocalMember field; |
| Expression expr; |
| |
| /** |
| * Constructor |
| */ |
| public VarDeclarationStatement(long where, Expression expr) { |
| super(VARDECLARATION, where); |
| this.expr = expr; |
| } |
| public VarDeclarationStatement(long where, LocalMember field, Expression expr) { |
| super(VARDECLARATION, where); |
| this.field = field; |
| this.expr = expr; |
| } |
| |
| /** |
| * Check statement |
| */ |
| Vset checkDeclaration(Environment env, Context ctx, Vset vset, int mod, Type t, Hashtable<Object, Object> exp) { |
| if (labels != null) { |
| env.error(where, "declaration.with.label", labels[0]); |
| } |
| if (field != null) { |
| if (ctx.getLocalClass(field.getName()) != null |
| && field.isInnerClass()) { |
| env.error(where, "local.class.redefined", field.getName()); |
| } |
| |
| ctx.declare(env, field); |
| if (field.isInnerClass()) { |
| ClassDefinition body = field.getInnerClass(); |
| try { |
| vset = body.checkLocalClass(env, ctx, vset, |
| null, null, null); |
| } catch (ClassNotFound ee) { |
| env.error(where, "class.not.found", ee.name, opNames[op]); |
| } |
| return vset; |
| } |
| vset.addVar(field.number); |
| return (expr != null) ? expr.checkValue(env, ctx, vset, exp) : vset; |
| } |
| |
| // Argument 'expr' is either an IdentifierExpression for a declaration of |
| // the form 'type x' or an AssignmentExpression for a declaration of the |
| // form 'type x = initvalue'. Note that these expressions are treated |
| // specially in this context, and don't have much connection to their ordinary |
| // meaning. |
| |
| Expression e = expr; |
| |
| if (e.op == ASSIGN) { |
| expr = ((AssignExpression)e).right; |
| e = ((AssignExpression)e).left; |
| } else { |
| expr = null; |
| } |
| |
| boolean declError = t.isType(TC_ERROR); |
| while (e.op == ARRAYACCESS) { |
| ArrayAccessExpression array = (ArrayAccessExpression)e; |
| if (array.index != null) { |
| env.error(array.index.where, "array.dim.in.type"); |
| declError = true; |
| } |
| e = array.right; |
| t = Type.tArray(t); |
| } |
| if (e.op == IDENT) { |
| Identifier id = ((IdentifierExpression)e).id; |
| if (ctx.getLocalField(id) != null) { |
| env.error(where, "local.redefined", id); |
| } |
| |
| field = new LocalMember(e.where, ctx.field.getClassDefinition(), mod, t, id); |
| ctx.declare(env, field); |
| |
| if (expr != null) { |
| vset = expr.checkInitializer(env, ctx, vset, t, exp); |
| expr = convert(env, ctx, t, expr); |
| field.setValue(expr); // for the sake of non-blank finals |
| if (field.isConstant()) { |
| // Keep in mind that isConstant() only means expressions |
| // that are constant according to the JLS. They might |
| // not be either constants or evaluable (eg. 1/0). |
| field.addModifiers(M_INLINEABLE); |
| } |
| vset.addVar(field.number); |
| } else if (declError) { |
| vset.addVar(field.number); |
| } else { |
| vset.addVarUnassigned(field.number); |
| } |
| return vset; |
| } |
| env.error(e.where, "invalid.decl"); |
| return vset; |
| } |
| |
| /** |
| * Inline |
| */ |
| public Statement inline(Environment env, Context ctx) { |
| if (field.isInnerClass()) { |
| ClassDefinition body = field.getInnerClass(); |
| body.inlineLocalClass(env); |
| return null; |
| } |
| |
| // Don't generate code for variable if unused and |
| // optimization is on, whether or not debugging is on |
| if (env.opt() && !field.isUsed()) { |
| return new ExpressionStatement(where, expr).inline(env, ctx); |
| } |
| |
| ctx.declare(env, field); |
| |
| if (expr != null) { |
| expr = expr.inlineValue(env, ctx); |
| field.setValue(expr); // for the sake of non-blank finals |
| if (env.opt() && (field.writecount == 0)) { |
| if (expr.op == IDENT) { |
| |
| // This code looks like it tests whether a final variable |
| // is being initialized by an identifier expression. |
| // Then if the identifier is a local of the same method |
| // it makes the final variable eligible to be inlined. |
| // BUT: why isn't the local also checked to make sure |
| // it is itself final? Unknown. |
| |
| IdentifierExpression e = (IdentifierExpression)expr; |
| if (e.field.isLocal() && ((ctx = ctx.getInlineContext()) != null) && |
| (((LocalMember)e.field).number < ctx.varNumber)) { |
| //System.out.println("FINAL IDENT = " + field + " in " + ctx.field); |
| field.setValue(expr); |
| field.addModifiers(M_INLINEABLE); |
| |
| // The two lines below used to elide the declaration |
| // of inlineable variables, on the theory that there |
| // wouldn't be any references. But this breaks the |
| // translation of nested classes, which might refer to |
| // the variable. |
| |
| //expr = null; |
| //return null; |
| } |
| } |
| if (expr.isConstant() || (expr.op == THIS) || (expr.op == SUPER)) { |
| //System.out.println("FINAL = " + field + " in " + ctx.field); |
| field.setValue(expr); |
| field.addModifiers(M_INLINEABLE); |
| |
| // The two lines below used to elide the declaration |
| // of inlineable variables, on the theory that there |
| // wouldn't be any references. But this breaks the |
| // translation of nested classes, which might refer to |
| // the variable. Fix for 4073244. |
| |
| //expr = null; |
| //return null; |
| } |
| } |
| } |
| return this; |
| } |
| |
| /** |
| * Create a copy of the statement for method inlining |
| */ |
| public Statement copyInline(Context ctx, boolean valNeeded) { |
| VarDeclarationStatement s = (VarDeclarationStatement)clone(); |
| if (expr != null) { |
| s.expr = expr.copyInline(ctx); |
| } |
| return s; |
| } |
| |
| /** |
| * The cost of inlining this statement |
| */ |
| public int costInline(int thresh, Environment env, Context ctx) { |
| if (field != null && field.isInnerClass()) { |
| return thresh; // don't copy classes... |
| } |
| return (expr != null) ? expr.costInline(thresh, env, ctx) : 0; |
| } |
| |
| /** |
| * Code |
| */ |
| public void code(Environment env, Context ctx, Assembler asm) { |
| if (expr != null && !expr.type.isType(TC_VOID)) { |
| // The two lines of code directly following this comment used |
| // to be in the opposite order. They were switched so that |
| // lines like the following: |
| // |
| // int j = (j = 4); |
| // |
| // will compile correctly. (Constructions like the above are |
| // legal. JLS 14.3.2 says that the scope of a local variable |
| // includes its own initializer.) It is important that we |
| // declare `field' before we code `expr', because otherwise |
| // situations can arise where `field' thinks it is assigned |
| // a local variable slot that is, in actuality, assigned to |
| // an entirely different variable. (Bug id 4076729) |
| ctx.declare(env, field); |
| expr.codeValue(env, ctx, asm); |
| |
| asm.add(where, opc_istore + field.getType().getTypeCodeOffset(), |
| new LocalVariable(field, field.number)); |
| } else { |
| ctx.declare(env, field); |
| if (expr != null) { |
| // an initial side effect, rather than an initial value |
| expr.code(env, ctx, asm); |
| } |
| } |
| } |
| |
| /** |
| * Print |
| */ |
| public void print(PrintStream out, int indent) { |
| out.print("local "); |
| if (field != null) { |
| out.print(field + "#" + field.hashCode()); |
| if (expr != null) { |
| out.print(" = "); |
| expr.print(out); |
| } |
| } else { |
| expr.print(out); |
| out.print(";"); |
| } |
| } |
| } |