You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
131 lines
4.1 KiB
131 lines
4.1 KiB
/* InstructionBlock (c) 1998 Jochen Hoenicke
|
|
*
|
|
* You may distribute under the terms of the GNU General Public License.
|
|
*
|
|
* IN NO EVENT SHALL JOCHEN HOENICKE BE LIABLE TO ANY PARTY FOR DIRECT,
|
|
* INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF
|
|
* THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF JOCHEN HOENICKE
|
|
* HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
* JOCHEN HOENICKE SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
|
|
* PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS ON AN "AS IS"
|
|
* BASIS, AND JOCHEN HOENICKE HAS NO OBLIGATION TO PROVIDE MAINTENANCE,
|
|
* SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
|
|
*
|
|
* $Id$
|
|
*/
|
|
package jode.flow;
|
|
import jode.Type;
|
|
import jode.decompiler.TabbedPrintWriter;
|
|
import jode.decompiler.LocalInfo;
|
|
import jode.expr.ComplexExpression;
|
|
import jode.expr.Expression;
|
|
import jode.expr.LocalStoreOperator;
|
|
|
|
/**
|
|
* This is the structured block for atomic instructions.
|
|
*/
|
|
public class InstructionBlock extends InstructionContainer {
|
|
/**
|
|
* The loads that are on the stack before cond is executed.
|
|
*/
|
|
VariableStack stack;
|
|
/**
|
|
* The local to which we push to, if the instruction is non void
|
|
*/
|
|
LocalInfo pushedLocal = null;
|
|
|
|
public InstructionBlock(Expression instr) {
|
|
super(instr);
|
|
}
|
|
|
|
public InstructionBlock(Expression instr, Jump jump) {
|
|
super(instr, jump);
|
|
}
|
|
|
|
/**
|
|
* This does take the instr into account and modifies stack
|
|
* accordingly. It then calls super.mapStackToLocal.
|
|
* @param stack the stack before the instruction is called
|
|
* @return stack the stack afterwards.
|
|
*/
|
|
public VariableStack mapStackToLocal(VariableStack stack) {
|
|
VariableStack newStack;
|
|
int params = instr.getOperandCount();
|
|
if (params > 0)
|
|
this.stack = stack.peek(params);
|
|
|
|
if (instr.getType() != Type.tVoid) {
|
|
pushedLocal = new LocalInfo();
|
|
newStack = stack.poppush(params, pushedLocal);
|
|
} else if (params > 0) {
|
|
newStack = stack.pop(params);
|
|
} else
|
|
newStack = stack;
|
|
return super.mapStackToLocal(newStack);
|
|
}
|
|
|
|
public void removePush() {
|
|
if (stack != null)
|
|
instr = stack.mergeIntoExpression(instr, used);
|
|
if (pushedLocal != null) {
|
|
LocalStoreOperator store = new LocalStoreOperator
|
|
(pushedLocal.getType(), pushedLocal,
|
|
LocalStoreOperator.ASSIGN_OP);
|
|
instr = new ComplexExpression(store, new Expression[] { instr });
|
|
used.addElement(pushedLocal);
|
|
}
|
|
super.removePush();
|
|
}
|
|
|
|
/**
|
|
* Tells if this block needs braces when used in a if or while block.
|
|
* @return true if this block should be sorrounded by braces.
|
|
*/
|
|
public boolean needsBraces() {
|
|
return declare != null && !declare.isEmpty();
|
|
}
|
|
|
|
/**
|
|
* True if this is a declaration.
|
|
*/
|
|
private boolean isDeclaration = false;
|
|
|
|
public void dumpDeclaration(TabbedPrintWriter writer, LocalInfo local)
|
|
throws java.io.IOException
|
|
{
|
|
if (instr instanceof ComplexExpression
|
|
&& instr.getOperator() instanceof LocalStoreOperator
|
|
&& ((LocalStoreOperator) instr.getOperator()).getLocalInfo()
|
|
== local.getLocalInfo()) {
|
|
isDeclaration = true;
|
|
} else
|
|
super.dumpDeclaration(writer, local);
|
|
}
|
|
|
|
public void dumpSource(TabbedPrintWriter writer)
|
|
throws java.io.IOException
|
|
{
|
|
isDeclaration = false;
|
|
super.dumpSource(writer);
|
|
}
|
|
|
|
public void dumpInstruction(TabbedPrintWriter writer)
|
|
throws java.io.IOException
|
|
{
|
|
if (isDeclaration) {
|
|
LocalInfo local = ((LocalStoreOperator) instr.getOperator())
|
|
.getLocalInfo();
|
|
Expression expr =
|
|
((ComplexExpression) instr).getSubExpressions()[0];
|
|
expr.makeInitializer();
|
|
writer.println(local.getType() + " " + local.getName() + " = "
|
|
+ expr.simplify().toString() + ";");
|
|
} else {
|
|
if (instr.getType() != jode.Type.tVoid)
|
|
writer.print("PUSH ");
|
|
writer.println(instr.simplify().toString()+";");
|
|
}
|
|
}
|
|
}
|
|
|