/*
* @(#)CompoundStatement.java 1.15 95/11/15 Arthur van Hoff
*
* Copyright (c) 1994 Sun Microsystems, Inc. All Rights Reserved.
*
* Permission to use, copy, modify, and distribute this software
* and its documentation for NON-COMMERCIAL purposes and without
* fee is hereby granted provided that this copyright notice
* appears in all copies. Please refer to the file "copyright.html"
* for further important copyright and licensing information.
*
* SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
* THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
* TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
* ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
* DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
*/
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;
public
class CompoundStatement extends Statement {
Statement args[];
/**
* Constructor
*/
public CompoundStatement(int where, Statement args[]) {
super(STAT, where);
this.args = args;
}
/**
* Check statement
*/
long check(Environment env, Context ctx, long vset, Hashtable exp) {
if (args.length > 0) {
vset = reach(env, vset);
CheckContext newctx = new CheckContext(ctx, this);
for (int i = 0 ; i < args.length ; i++) {
vset = args[i].check(env, newctx, vset, exp);
}
vset &= 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) {
int cost = 0;
for (int i = 0 ; (i < args.length) && (cost < thresh) ; i++) {
cost += args[i].costInline(thresh);
}
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 boolean firstConstructor() {
return (args.length > 0) && args[0].firstConstructor();
}
/**
* 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("}");
}
}