/*
* 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.Label;
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 CompoundStatement extends Statement {
Statement args[];
/**
* Constructor
*/
public CompoundStatement(long where, Statement args[]) {
super(STAT, where);
this.args = args;
// To avoid the need for subsequent null checks:
for (int i = 0 ; i < args.length ; i++) {
if (args[i] == null) {
args[i] = new CompoundStatement(where, new Statement[0]);
}
}
}
/**
* Insert a new statement at the front.
* This is used to introduce an implicit super-class constructor call.
*/
public void insertStatement(Statement s) {
Statement newargs[] = new Statement[1+args.length];
newargs[0] = s;
for (int i = 0 ; i < args.length ; i++) {
newargs[i+1] = args[i];
}
this.args = newargs;
}
/**
* Check statement
*/
Vset check(Environment env, Context ctx, Vset vset, Hashtable exp) {
checkLabel(env, ctx);
if (args.length > 0) {
vset = reach(env, vset);
CheckContext newctx = new CheckContext(ctx, this);
// In this environment, 'resolveName' will look for local classes.
Environment newenv = Context.newEnvironment(env, newctx);
for (int i = 0 ; i < args.length ; i++) {
vset = args[i].checkBlockStatement(newenv, newctx, vset, exp);
}
vset = vset.join(newctx.vsBreak);
}
return ctx.removeAdditionalVars(vset);
}
/**
* Inline
*/
public Statement inline(Environment env, Context ctx) {
ctx = new Context(ctx, this);
boolean expand = false;
int count = 0;
for (int i = 0 ; i < args.length ; i++) {
Statement s = args[i];
if (s != null) {
if ((s = s.inline(env, ctx)) != null) {
if ((s.op == STAT) && (s.labels == null)) {
count += ((CompoundStatement)s).args.length;
} else {
count++;
}
expand = true;
}
args[i] = s;
}
}
switch (count) {
case 0:
return null;
case 1:
for (int i = args.length ; i-- > 0 ;) {
if (args[i] != null) {
return eliminate(env, args[i]);
}
}
break;
}
if (expand || (count != args.length)) {
Statement newArgs[] = new Statement[count];
for (int i = args.length ; i-- > 0 ;) {
Statement s = args[i];
if (s != null) {
if ((s.op == STAT) && (s.labels == null)) {
Statement a[] = ((CompoundStatement)s).args;
for (int j = a.length ; j-- > 0 ; ) {
newArgs[--count] = a[j];
}
} else {
newArgs[--count] = s;
}
}
}
args = newArgs;
}
return this;
}
/**
* Create a copy of the statement for method inlining
*/
public Statement copyInline(Context ctx, boolean valNeeded) {
CompoundStatement s = (CompoundStatement)clone();
s.args = new Statement[args.length];
for (int i = 0 ; i < args.length ; i++) {
s.args[i] = args[i].copyInline(ctx, valNeeded);
}
return s;
}
/**
* The cost of inlining this statement
*/
public int costInline(int thresh, Environment env, Context ctx) {
int cost = 0;
for (int i = 0 ; (i < args.length) && (cost < thresh) ; i++) {
cost += args[i].costInline(thresh, env, ctx);
}
return cost;
}
/**
* Code
*/
public void code(Environment env, Context ctx, Assembler asm) {
CodeContext newctx = new CodeContext(ctx, this);
for (int i = 0 ; i < args.length ; i++) {
args[i].code(env, newctx, asm);
}
asm.add(newctx.breakLabel);
}
/**
* Check if the first thing is a constructor invocation
*/
public Expression firstConstructor() {
return (args.length > 0) ? args[0].firstConstructor() : null;
}
/**
* Print
*/
public void print(PrintStream out, int indent) {
super.print(out, indent);
out.print("{\n");
for (int i = 0 ; i < args.length ; i++) {
printIndent(out, indent+1);
if (args[i] != null) {
args[i].print(out, indent + 1);
} else {
out.print("<empty>");
}
out.print("\n");
}
printIndent(out, indent);
out.print("}");
}
}