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instructions collectionified

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git-svn-id: https://svn.code.sf.net/p/jode/code/trunk@1102 379699f6-c40d-0410-875b-85095c16579e
branch_1_1
jochen 25 years ago
parent 67e5bf4656
commit 02522b5cef
3 changed files with 33 additions and 42 deletions
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
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  1. 32
      jode/jode/decompiler/DeadCodeAnalysis.java.in
  2. 19
      jode/jode/decompiler/MethodAnalyzer.java.in
  3. 24
      jode/jode/decompiler/Opcodes.java

32
jode/jode/decompiler/DeadCodeAnalysis.java → jode/jode/decompiler/DeadCodeAnalysis.java.in
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@ -22,21 +22,20 @@ import jode.bytecode.BytecodeInfo;
import jode.bytecode.Instruction;
import jode.bytecode.Handler;
import @COLLECTIONS@.Iterator;
public class DeadCodeAnalysis {
private final static String REACHABLE = "R";
private final static String REACHCHANGED = "C";
private static void propagateReachability(Instruction firstInstr,
Instruction reachInstr) {
if (reachInstr.getTmpInfo() != null)
return;
reachInstr.setTmpInfo(REACHCHANGED);
private static void propagateReachability(BytecodeInfo code) {
boolean changed;
do {
changed = false;
for (Instruction instr = firstInstr;
instr != null; instr = instr.getNextByAddr()) {
for (Iterator iter = code.getInstructions().iterator();
iter.hasNext(); ) {
Instruction instr = (Instruction) iter.next();
if (instr.getTmpInfo() == REACHCHANGED) {
changed = true;
instr.setTmpInfo(REACHABLE);
@ -59,7 +58,8 @@ public class DeadCodeAnalysis {
}
public static void removeDeadCode(BytecodeInfo code) {
propagateReachability(code.getFirstInstr(), code.getFirstInstr());
((Instruction) code.getInstructions().get(0)).setTmpInfo(REACHCHANGED);
propagateReachability(code);
Handler[] handlers = code.getExceptionHandlers();
boolean changed;
do {
@ -72,8 +72,8 @@ public class DeadCodeAnalysis {
for (Instruction instr = handlers[i].start;
instr != null; instr = instr.getNextByAddr()) {
if (instr.getTmpInfo() != null) {
propagateReachability(code.getFirstInstr(),
handlers[i].catcher);
handlers[i].catcher.setTmpInfo(REACHCHANGED);
propagateReachability(code);
changed = true;
break;
}
@ -105,14 +105,12 @@ public class DeadCodeAnalysis {
}
/* Now remove the dead code and clean up tmpInfo */
Instruction nextInstr;
for (Instruction instr = code.getFirstInstr();
instr != null; instr = nextInstr) {
nextInstr = instr.getNextByAddr();
if (instr.getTmpInfo() == null)
instr.removeInstruction();
else
for (Iterator i = code.getInstructions().iterator(); i.hasNext(); ) {
Instruction instr = (Instruction) i.next();
if (instr.getTmpInfo() != null)
instr.setTmpInfo(null);
else
i.remove();
}
}
}

19
jode/jode/decompiler/MethodAnalyzer.java.in
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@ -54,6 +54,7 @@ import java.io.ByteArrayInputStream;
import java.io.IOException;
import @COLLECTIONS@.Map;
import @COLLECTIONS@.Iterator;
public class MethodAnalyzer implements Analyzer, Scope, ClassDeclarer {
ImportHandler imports;
@ -240,8 +241,9 @@ public class MethodAnalyzer implements Analyzer, Scope, ClassDeclarer {
/* First create a FlowBlock for every block that has a
* predecessor other than the previous instruction.
*/
for (Instruction instr = code.getFirstInstr();
instr != null; instr = instr.getNextByAddr()) {
for (Iterator i = code.getInstructions().iterator();
i.hasNext(); ) {
Instruction instr = (Instruction) i.next();
if (instr.getPrevByAddr() == null
|| instr.getPrevByAddr().doesAlwaysJump()
|| instr.getPreds() != null)
@ -271,8 +273,9 @@ public class MethodAnalyzer implements Analyzer, Scope, ClassDeclarer {
int mark = 1000;
FlowBlock lastBlock = null;
boolean lastSequential = false;
for (Instruction instr = code.getFirstInstr();
instr != null; instr = instr.getNextByAddr()) {
for (Iterator i = code.getInstructions().iterator();
i.hasNext(); ) {
Instruction instr = (Instruction) i.next();
jode.flow.StructuredBlock block
= Opcodes.readOpcode(instr, this);
@ -306,7 +309,8 @@ public class MethodAnalyzer implements Analyzer, Scope, ClassDeclarer {
}
}
methodHeader = (FlowBlock) code.getFirstInstr().getTmpInfo();
methodHeader = (FlowBlock)
((Instruction) code.getInstructions().get(0)).getTmpInfo();
excHandlers = new TransformExceptionHandlers();
for (int i=0; i<handlers.length; i++) {
Type type = null;
@ -321,9 +325,10 @@ public class MethodAnalyzer implements Analyzer, Scope, ClassDeclarer {
excHandlers.addHandler(start, endAddr, handler, type);
}
}
for (Instruction instr = code.getFirstInstr();
instr != null; instr = instr.getNextByAddr())
for (Iterator i = code.getInstructions().iterator(); i.hasNext(); ) {
Instruction instr = (Instruction) i.next();
instr.setTmpInfo(null);
}
if (GlobalOptions.verboseLevel > 0)
GlobalOptions.err.print('-');

24
jode/jode/decompiler/Opcodes.java
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@ -92,14 +92,14 @@ public abstract class Opcodes implements jode.bytecode.Opcodes {
Instruction instr)
{
return new EmptyBlock
(new Jump((FlowBlock)instr.getSuccs()[0].getTmpInfo()));
(new Jump((FlowBlock)instr.getSingleSucc().getTmpInfo()));
}
private static StructuredBlock createJsr(MethodAnalyzer ma,
Instruction instr)
{
return new JsrBlock
(new Jump((FlowBlock)instr.getSuccs()[0].getTmpInfo()),
(new Jump((FlowBlock)instr.getSingleSucc().getTmpInfo()),
new Jump(FlowBlock.NEXT_BY_ADDR));
}
@ -108,7 +108,7 @@ public abstract class Opcodes implements jode.bytecode.Opcodes {
Expression expr)
{
return new ConditionalBlock
(expr, new Jump((FlowBlock)instr.getSuccs()[0].getTmpInfo()),
(expr, new Jump((FlowBlock)instr.getSingleSucc().getTmpInfo()),
new Jump(FlowBlock.NEXT_BY_ADDR));
}
@ -176,7 +176,7 @@ public abstract class Opcodes implements jode.bytecode.Opcodes {
(ma, instr, new StoreInstruction
(new LocalStoreOperator
(types[LOCAL_TYPES][opcode-opc_istore],
ma.getLocalInfo(instr.getAddr()+instr.getLength(),
ma.getLocalInfo(instr.getNextByAddr().getAddr(),
instr.getLocalSlot()))));
case opc_iastore: case opc_lastore:
case opc_fastore: case opc_dastore: case opc_aastore:
@ -223,7 +223,7 @@ public abstract class Opcodes implements jode.bytecode.Opcodes {
(types[ZBIN_TYPES][(opcode - opc_iand)%2],
(opcode - opc_iand)/2 + Operator.AND_OP));
case opc_iinc: {
int value = instr.getIntData();
int value = instr.getIncrement();
int operation = Operator.ADD_OP;
if (value < 0) {
value = -value;
@ -294,18 +294,6 @@ public abstract class Opcodes implements jode.bytecode.Opcodes {
return createRet
(ma, instr,
ma.getLocalInfo(instr.getAddr(), instr.getLocalSlot()));
case opc_tableswitch: {
int low = instr.getIntData();
int[] cases = new int[instr.getSuccs().length-1];
FlowBlock[] dests = new FlowBlock[instr.getSuccs().length];
for (int i=0; i < cases.length; i++) {
cases[i] = i+low;
dests[i] = (FlowBlock) instr.getSuccs()[i].getTmpInfo();
}
dests[cases.length] = (FlowBlock)
instr.getSuccs()[cases.length].getTmpInfo();
return createSwitch(ma, instr, cases, dests);
}
case opc_lookupswitch: {
int[] cases = instr.getValues();
FlowBlock[] dests = new FlowBlock[instr.getSuccs().length];
@ -382,7 +370,7 @@ public abstract class Opcodes implements jode.bytecode.Opcodes {
case opc_multianewarray: {
Type type = Type.tType(instr.getClazzType());
ma.useType(type);
int dimension = instr.getIntData();
int dimension = instr.getDimensions();
return createNormal(ma, instr,
new NewArrayOperator(type, dimension));
}

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