author | ntoda |
Thu, 31 Jul 2014 17:01:24 -0700 | |
changeset 25799 | 1afc4675dc75 |
parent 25522 | 10d789df41bb |
permissions | -rw-r--r-- |
2 | 1 |
/* |
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* Copyright (c) 1994, 2003, Oracle and/or its affiliates. All rights reserved. |
2 | 3 |
* 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. Oracle designates this |
2 | 8 |
* particular file as subject to the "Classpath" exception as provided |
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* by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package sun.tools.tree; |
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import sun.tools.java.*; |
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import sun.tools.asm.Assembler; |
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import sun.tools.asm.LocalVariable; |
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import java.io.PrintStream; |
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import java.util.Hashtable; |
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||
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/** |
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* WARNING: The contents of this source file are not part of any |
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* supported API. Code that depends on them does so at its own risk: |
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* they are subject to change or removal without notice. |
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*/ |
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public |
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class IdentifierExpression extends Expression { |
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Identifier id; |
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MemberDefinition field; |
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Expression implementation; |
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||
45 |
/** |
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* Constructor |
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*/ |
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public IdentifierExpression(long where, Identifier id) { |
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super(IDENT, where, Type.tError); |
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this.id = id; |
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} |
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public IdentifierExpression(IdentifierToken id) { |
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this(id.getWhere(), id.getName()); |
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} |
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public IdentifierExpression(long where, MemberDefinition field) { |
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super(IDENT, where, field.getType()); |
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this.id = field.getName(); |
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this.field = field; |
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} |
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||
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public Expression getImplementation() { |
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if (implementation != null) |
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return implementation; |
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return this; |
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} |
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||
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/** |
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* Check if the expression is equal to a value |
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*/ |
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public boolean equals(Identifier id) { |
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return this.id.equals(id); |
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} |
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||
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/** |
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* Assign a value to this identifier. [It must already be "bound"] |
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*/ |
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private Vset assign(Environment env, Context ctx, Vset vset) { |
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if (field.isLocal()) { |
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LocalMember local = (LocalMember)field; |
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if (local.scopeNumber < ctx.frameNumber) { |
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env.error(where, "assign.to.uplevel", id); |
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} |
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if (local.isFinal()) { |
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// allow definite single assignment of blank finals |
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if (!local.isBlankFinal()) { |
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env.error(where, "assign.to.final", id); |
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} else if (!vset.testVarUnassigned(local.number)) { |
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env.error(where, "assign.to.blank.final", id); |
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} |
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} |
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vset.addVar(local.number); |
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local.writecount++; |
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} else if (field.isFinal()) { |
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vset = FieldExpression.checkFinalAssign(env, ctx, vset, |
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where, field); |
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} |
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return vset; |
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} |
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/** |
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* Get the value of this identifier. [ It must already be "bound"] |
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*/ |
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private Vset get(Environment env, Context ctx, Vset vset) { |
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if (field.isLocal()) { |
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LocalMember local = (LocalMember)field; |
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if (local.scopeNumber < ctx.frameNumber && !local.isFinal()) { |
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env.error(where, "invalid.uplevel", id); |
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} |
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if (!vset.testVar(local.number)) { |
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env.error(where, "var.not.initialized", id); |
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vset.addVar(local.number); |
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} |
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local.readcount++; |
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} else { |
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if (!field.isStatic()) { |
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if (!vset.testVar(ctx.getThisNumber())) { |
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env.error(where, "access.inst.before.super", id); |
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implementation = null; |
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} |
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} |
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if (field.isBlankFinal()) { |
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int number = ctx.getFieldNumber(field); |
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if (number >= 0 && !vset.testVar(number)) { |
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env.error(where, "var.not.initialized", id); |
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} |
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} |
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} |
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return vset; |
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} |
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/** |
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* Bind to a field |
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*/ |
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boolean bind(Environment env, Context ctx) { |
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try { |
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field = ctx.getField(env, id); |
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if (field == null) { |
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for (ClassDefinition cdef = ctx.field.getClassDefinition(); |
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cdef != null; cdef = cdef.getOuterClass()) { |
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if (cdef.findAnyMethod(env, id) != null) { |
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env.error(where, "invalid.var", id, |
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ctx.field.getClassDeclaration()); |
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return false; |
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} |
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} |
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env.error(where, "undef.var", id); |
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return false; |
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} |
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type = field.getType(); |
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// Check access permission |
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if (!ctx.field.getClassDefinition().canAccess(env, field)) { |
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env.error(where, "no.field.access", |
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id, field.getClassDeclaration(), |
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ctx.field.getClassDeclaration()); |
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return false; |
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} |
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// Find out how to access this variable. |
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if (field.isLocal()) { |
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LocalMember local = (LocalMember)field; |
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if (local.scopeNumber < ctx.frameNumber) { |
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// get a "val$x" copy via the current object |
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implementation = ctx.makeReference(env, local); |
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} |
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} else { |
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MemberDefinition f = field; |
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||
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if (f.reportDeprecated(env)) { |
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env.error(where, "warn.field.is.deprecated", |
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id, f.getClassDefinition()); |
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} |
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ClassDefinition fclass = f.getClassDefinition(); |
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if (fclass != ctx.field.getClassDefinition()) { |
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// Maybe an inherited field hides an apparent variable. |
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MemberDefinition f2 = ctx.getApparentField(env, id); |
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if (f2 != null && f2 != f) { |
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ClassDefinition c = ctx.findScope(env, fclass); |
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if (c == null) c = f.getClassDefinition(); |
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if (f2.isLocal()) { |
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env.error(where, "inherited.hides.local", |
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id, c.getClassDeclaration()); |
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} else { |
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env.error(where, "inherited.hides.field", |
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id, c.getClassDeclaration(), |
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f2.getClassDeclaration()); |
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} |
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} |
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} |
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// Rewrite as a FieldExpression. |
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// Access methods for private fields, if needed, will be added |
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// during subsequent processing of the FieldExpression. See |
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// method 'FieldExpression.checkCommon'. This division of labor |
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// is somewhat awkward, as most further processing of a |
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// FieldExpression during the checking phase is suppressed when |
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// the referenced field is pre-set as it is here. |
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if (f.isStatic()) { |
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Expression base = new TypeExpression(where, |
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f.getClassDeclaration().getType()); |
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implementation = new FieldExpression(where, null, f); |
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} else { |
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Expression base = ctx.findOuterLink(env, where, f); |
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if (base != null) { |
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implementation = new FieldExpression(where, base, f); |
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} |
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} |
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} |
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// Check forward reference |
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if (!ctx.canReach(env, field)) { |
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env.error(where, "forward.ref", |
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id, field.getClassDeclaration()); |
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return false; |
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} |
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return true; |
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} catch (ClassNotFound e) { |
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env.error(where, "class.not.found", e.name, ctx.field); |
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} catch (AmbiguousMember e) { |
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env.error(where, "ambig.field", id, |
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e.field1.getClassDeclaration(), |
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e.field2.getClassDeclaration()); |
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} |
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return false; |
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} |
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||
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/** |
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* Check expression |
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*/ |
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25799
1afc4675dc75
8044867: Fix raw and unchecked lint warnings in sun.tools.*
ntoda
parents:
25522
diff
changeset
|
234 |
public Vset checkValue(Environment env, Context ctx, Vset vset, Hashtable<Object, Object> exp) { |
2 | 235 |
if (field != null) { |
236 |
// An internally pre-set field, such as an argument copying |
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// an uplevel value. Do not re-check it. |
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return vset; |
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} |
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if (bind(env, ctx)) { |
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vset = get(env, ctx, vset); |
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ctx.field.getClassDefinition().addDependency(field.getClassDeclaration()); |
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if (implementation != null) |
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vset = implementation.checkValue(env, ctx, vset, exp); |
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} |
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return vset; |
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} |
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248 |
||
249 |
/** |
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250 |
* Check the expression if it appears on the LHS of an assignment |
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251 |
*/ |
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252 |
public Vset checkLHS(Environment env, Context ctx, |
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25799
1afc4675dc75
8044867: Fix raw and unchecked lint warnings in sun.tools.*
ntoda
parents:
25522
diff
changeset
|
253 |
Vset vset, Hashtable<Object, Object> exp) { |
2 | 254 |
if (!bind(env, ctx)) |
255 |
return vset; |
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256 |
vset = assign(env, ctx, vset); |
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257 |
if (implementation != null) |
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vset = implementation.checkValue(env, ctx, vset, exp); |
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return vset; |
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} |
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261 |
||
262 |
/** |
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* Check the expression if it appears on the LHS of an op= expression |
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*/ |
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public Vset checkAssignOp(Environment env, Context ctx, |
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25799
1afc4675dc75
8044867: Fix raw and unchecked lint warnings in sun.tools.*
ntoda
parents:
25522
diff
changeset
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266 |
Vset vset, Hashtable<Object, Object> exp, Expression outside) { |
2 | 267 |
if (!bind(env, ctx)) |
268 |
return vset; |
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vset = assign(env, ctx, get(env, ctx, vset)); |
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if (implementation != null) |
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271 |
vset = implementation.checkValue(env, ctx, vset, exp); |
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272 |
return vset; |
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273 |
} |
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274 |
||
275 |
/** |
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276 |
* Return an accessor if one is needed for assignments to this expression. |
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277 |
*/ |
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278 |
public FieldUpdater getAssigner(Environment env, Context ctx) { |
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279 |
if (implementation != null) |
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return implementation.getAssigner(env, ctx); |
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return null; |
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282 |
} |
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283 |
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284 |
/** |
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285 |
* Return an updater if one is needed for assignments to this expression. |
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286 |
*/ |
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287 |
public FieldUpdater getUpdater(Environment env, Context ctx) { |
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288 |
if (implementation != null) |
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289 |
return implementation.getUpdater(env, ctx); |
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290 |
return null; |
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291 |
} |
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292 |
||
293 |
/** |
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294 |
* Check if the present name is part of a scoping prefix. |
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295 |
*/ |
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25799
1afc4675dc75
8044867: Fix raw and unchecked lint warnings in sun.tools.*
ntoda
parents:
25522
diff
changeset
|
296 |
public Vset checkAmbigName(Environment env, Context ctx, Vset vset, Hashtable<Object, Object> exp, |
2 | 297 |
UnaryExpression loc) { |
298 |
try { |
|
299 |
if (ctx.getField(env, id) != null) { |
|
300 |
// if this is a local field, there's nothing more to do. |
|
301 |
return checkValue(env, ctx, vset, exp); |
|
302 |
} |
|
303 |
} catch (ClassNotFound ee) { |
|
304 |
} catch (AmbiguousMember ee) { |
|
305 |
} |
|
306 |
// Can this be interpreted as a type? |
|
307 |
ClassDefinition c = toResolvedType(env, ctx, true); |
|
308 |
// Is it a real type?? |
|
309 |
if (c != null) { |
|
310 |
loc.right = new TypeExpression(where, c.getType()); |
|
311 |
return vset; |
|
312 |
} |
|
313 |
// We hope it is a package prefix. Let the caller decide. |
|
314 |
type = Type.tPackage; |
|
315 |
return vset; |
|
316 |
} |
|
317 |
||
318 |
/** |
|
319 |
* Convert an identifier to a known type, or null. |
|
320 |
*/ |
|
321 |
private ClassDefinition toResolvedType(Environment env, Context ctx, |
|
322 |
boolean pkgOK) { |
|
323 |
Identifier rid = ctx.resolveName(env, id); |
|
324 |
Type t = Type.tClass(rid); |
|
325 |
if (pkgOK && !env.classExists(t)) { |
|
326 |
return null; |
|
327 |
} |
|
328 |
if (env.resolve(where, ctx.field.getClassDefinition(), t)) { |
|
329 |
try { |
|
330 |
ClassDefinition c = env.getClassDefinition(t); |
|
331 |
||
332 |
// Maybe an inherited class hides an apparent class. |
|
333 |
if (c.isMember()) { |
|
334 |
ClassDefinition sc = ctx.findScope(env, c.getOuterClass()); |
|
335 |
if (sc != c.getOuterClass()) { |
|
336 |
Identifier rid2 = ctx.getApparentClassName(env, id); |
|
337 |
if (!rid2.equals(idNull) && !rid2.equals(rid)) { |
|
338 |
env.error(where, "inherited.hides.type", |
|
339 |
id, sc.getClassDeclaration()); |
|
340 |
} |
|
341 |
} |
|
342 |
} |
|
343 |
||
344 |
if (!c.getLocalName().equals(id.getFlatName().getName())) { |
|
345 |
env.error(where, "illegal.mangled.name", id, c); |
|
346 |
} |
|
347 |
||
348 |
return c; |
|
349 |
} catch (ClassNotFound ee) { |
|
350 |
} |
|
351 |
} |
|
352 |
return null; |
|
353 |
} |
|
354 |
||
355 |
/** |
|
356 |
* Convert an identifier to a type. |
|
357 |
* If one is not known, use the current package as a qualifier. |
|
358 |
*/ |
|
359 |
Type toType(Environment env, Context ctx) { |
|
360 |
ClassDefinition c = toResolvedType(env, ctx, false); |
|
361 |
if (c != null) { |
|
362 |
return c.getType(); |
|
363 |
} |
|
364 |
return Type.tError; |
|
365 |
} |
|
366 |
||
367 |
/** |
|
368 |
* Convert an expresion to a type in a context where a qualified |
|
369 |
* type name is expected, e.g., in the prefix of a qualified type |
|
370 |
* name. We do not necessarily know where the package prefix ends, |
|
371 |
* so we operate similarly to 'checkAmbiguousName'. This is the |
|
372 |
* base case -- the first component of the qualified name. |
|
373 |
*/ |
|
374 |
/*-------------------------------------------------------* |
|
375 |
Type toQualifiedType(Environment env, Context ctx) { |
|
376 |
// We do not look for non-type fields. Is this correct? |
|
377 |
ClassDefinition c = toResolvedType(env, ctx, true); |
|
378 |
// Is it a real type? |
|
379 |
if (c != null) { |
|
380 |
return c.getType(); |
|
381 |
} |
|
382 |
// We hope it is a package prefix. Let the caller decide. |
|
383 |
return Type.tPackage; |
|
384 |
} |
|
385 |
*-------------------------------------------------------*/ |
|
386 |
||
387 |
/** |
|
388 |
* Check if constant: Will it inline away? |
|
389 |
*/ |
|
390 |
public boolean isConstant() { |
|
391 |
if (implementation != null) |
|
392 |
return implementation.isConstant(); |
|
393 |
if (field != null) { |
|
394 |
return field.isConstant(); |
|
395 |
} |
|
396 |
return false; |
|
397 |
} |
|
398 |
||
399 |
/** |
|
400 |
* Inline |
|
401 |
*/ |
|
402 |
public Expression inline(Environment env, Context ctx) { |
|
403 |
return null; |
|
404 |
} |
|
405 |
public Expression inlineValue(Environment env, Context ctx) { |
|
406 |
if (implementation != null) |
|
407 |
return implementation.inlineValue(env, ctx); |
|
408 |
if (field == null) { |
|
409 |
return this; |
|
410 |
} |
|
411 |
try { |
|
412 |
if (field.isLocal()) { |
|
413 |
if (field.isInlineable(env, false)) { |
|
414 |
Expression e = (Expression)field.getValue(env); |
|
415 |
return (e == null) ? this : e.inlineValue(env, ctx); |
|
416 |
} |
|
417 |
return this; |
|
418 |
} |
|
419 |
return this; |
|
420 |
} catch (ClassNotFound e) { |
|
421 |
throw new CompilerError(e); |
|
422 |
} |
|
423 |
} |
|
424 |
public Expression inlineLHS(Environment env, Context ctx) { |
|
425 |
if (implementation != null) |
|
426 |
return implementation.inlineLHS(env, ctx); |
|
427 |
return this; |
|
428 |
} |
|
429 |
||
430 |
public Expression copyInline(Context ctx) { |
|
431 |
if (implementation != null) |
|
432 |
return implementation.copyInline(ctx); |
|
433 |
IdentifierExpression e = |
|
434 |
(IdentifierExpression)super.copyInline(ctx); |
|
435 |
if (field != null && field.isLocal()) { |
|
436 |
e.field = ((LocalMember)field).getCurrentInlineCopy(ctx); |
|
437 |
} |
|
438 |
return e; |
|
439 |
} |
|
440 |
||
441 |
public int costInline(int thresh, Environment env, Context ctx) { |
|
442 |
if (implementation != null) |
|
443 |
return implementation.costInline(thresh, env, ctx); |
|
444 |
return super.costInline(thresh, env, ctx); |
|
445 |
} |
|
446 |
||
447 |
/** |
|
448 |
* Code local vars (object fields have been inlined away) |
|
449 |
*/ |
|
450 |
int codeLValue(Environment env, Context ctx, Assembler asm) { |
|
451 |
return 0; |
|
452 |
} |
|
453 |
void codeLoad(Environment env, Context ctx, Assembler asm) { |
|
454 |
asm.add(where, opc_iload + type.getTypeCodeOffset(), |
|
25522
10d789df41bb
8049892: Replace uses of 'new Integer()' with appropriate alternative across core classes
prr
parents:
5506
diff
changeset
|
455 |
((LocalMember)field).number); |
2 | 456 |
} |
457 |
void codeStore(Environment env, Context ctx, Assembler asm) { |
|
458 |
LocalMember local = (LocalMember)field; |
|
459 |
asm.add(where, opc_istore + type.getTypeCodeOffset(), |
|
460 |
new LocalVariable(local, local.number)); |
|
461 |
} |
|
462 |
public void codeValue(Environment env, Context ctx, Assembler asm) { |
|
463 |
codeLValue(env, ctx, asm); |
|
464 |
codeLoad(env, ctx, asm); |
|
465 |
} |
|
466 |
||
467 |
/** |
|
468 |
||
469 |
*/ |
|
470 |
public void print(PrintStream out) { |
|
471 |
out.print(id + "#" + ((field != null) ? field.hashCode() : 0)); |
|
472 |
if (implementation != null) { |
|
473 |
out.print("/IMPL="); |
|
474 |
implementation.print(out); |
|
475 |
} |
|
476 |
} |
|
25799
1afc4675dc75
8044867: Fix raw and unchecked lint warnings in sun.tools.*
ntoda
parents:
25522
diff
changeset
|
477 |
} |