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Synchronized blocks, finally block that return

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git-svn-id: https://svn.code.sf.net/p/jode/code/trunk@66 379699f6-c40d-0410-875b-85095c16579e
stable
jochen 27 years ago
parent d678c6a827
commit a19c2593da
1 changed files with 333 additions and 102 deletions
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  1. 435
      jode/jode/flow/FlowBlock.java

435
jode/jode/flow/FlowBlock.java
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@ -578,18 +578,18 @@ public class FlowBlock {
jump.prev.jump != jump)
throw new RuntimeException("Inconsistency");
StructuredBlock sb = jump.prev;
while (sb != block) {
if (sb.outer == null)
StructuredBlock prev = jump.prev;
while (prev != block) {
if (prev.outer == null)
throw new RuntimeException("Inconsistency");
StructuredBlock[] blocks = sb.outer.getSubBlocks();
StructuredBlock[] blocks = prev.outer.getSubBlocks();
int i;
for (i=0; i<blocks.length; i++)
if (blocks[i] == sb)
if (blocks[i] == prev)
break;
if (i == blocks.length)
throw new RuntimeException("Inconsistency");
sb = sb.outer;
prev = prev.outer;
}
}
// } catch (RuntimeException ex) {
@ -719,13 +719,6 @@ public class FlowBlock {
checkConsistent();
// TabbedPrintWriter writer = new jode.TabbedPrintWriter(System.err, " ");
// try {
// writer.println("XXXXXXXXXXXXXXXX");
// writer.tab();
// dumpSource(writer);
// } catch(java.io.IOException ex) {}
appendBlock = resolveRemaining(succ, appendBlock);
}
@ -956,7 +949,7 @@ public class FlowBlock {
*/
Enumeration enum = successors.elements();
StructuredBlock appendBlock = lastModified;
while(enum.hasMoreElements()) {
while (enum.hasMoreElements()) {
Jump jump = (Jump) enum.nextElement();
if (jump == null || jump.destination != END_OF_METHOD)
continue;
@ -972,6 +965,17 @@ public class FlowBlock {
/* Try to eliminate as many jumps as possible.
*/
while (enum.hasMoreElements()) {
Jump jump = (Jump) enum.nextElement();
if (jump == null || jump.destination != END_OF_METHOD ||
jump.prev == appendBlock)
if (jump.prev instanceof ReturnBlock)
jump.prev.removeJump();
}
appendBlock = optimizeJumps(END_OF_METHOD, appendBlock);
enum = successors.elements();
@ -982,7 +986,7 @@ public class FlowBlock {
if (jump == null || jump.destination != END_OF_METHOD ||
jump.prev == appendBlock)
continue;
BreakableBlock breakToBlock = null;
for (StructuredBlock surrounder = jump.prev.outer;
surrounder != null && surrounder != appendBlock.outer;
@ -999,12 +1003,13 @@ public class FlowBlock {
StructuredBlock prevBlock = jump.prev;
prevBlock.removeJump();
if (breakToBlock == null)
if (breakToBlock == null) {
/* The successor is the dummy return instruction, so
* replace the jump with a return.
*/
prevBlock.appendBlock(new ReturnBlock());
else
} else
prevBlock.appendBlock
(new BreakBlock(breakToBlock, false));
}
@ -1031,6 +1036,7 @@ public class FlowBlock {
new CreateIfThenElseOperator(),
new CreateConstantArray(),
new CreateForInitializer(),
new CompleteSynchronized(),
};
@ -1234,6 +1240,239 @@ public class FlowBlock {
throw new AssertError(ioex.toString());
}
}
public void checkAndRemoveJSR(FlowBlock subRoutine) {
Enumeration enum = successors.elements();
while (enum.hasMoreElements()) {
Jump jump = (Jump)enum.nextElement();
if (jump == null || jump.destination == subRoutine)
continue;
StructuredBlock prev = jump.prev;
if (prev instanceof JsrBlock) {
/* The jump is directly preceeded by a jsr.
* Everything okay.
*/
continue;
}
if (prev instanceof EmptyBlock
&& prev.outer instanceof JsrBlock) {
/* If jump is a jsr check the outer
* block instead.
*/
prev = prev.outer;
}
if ((prev instanceof EmptyBlock
|| prev instanceof ReturnBlock)
&& prev.outer instanceof SequentialBlock) {
SequentialBlock seq = (SequentialBlock) prev.outer;
if (seq.subBlocks[1] == prev
&& (seq.subBlocks[0] instanceof JsrBlock
|| seq.subBlocks[0].jump != null)) {
/* The jump is preceeded by another jump
* or jsr and last in its block, okay.
*/
continue;
}
if (seq.subBlocks[0] == prev
&& seq.outer instanceof SequentialBlock
&& (seq.outer.getSubBlocks()[0] instanceof JsrBlock
||seq.outer.getSubBlocks()[0].jump != null)) {
/* The jump is preceeded by another jump
* or jsr and not last in its block, okay.
*/
}
}
/* Now we have a jump with a wrong destination.
* Complain!
*/
System.err.println("non well formed try-finally block");
}
enum = successors.elements();
while (enum.hasMoreElements()) {
Jump jump = (Jump)enum.nextElement();
if (jump == null || jump.destination != subRoutine)
continue;
StructuredBlock prev = jump.prev;
if (prev instanceof EmptyBlock
&& prev.outer instanceof JsrBlock) {
StructuredBlock sb = prev.outer.getNextBlock();
if (sb == null
|| ((sb instanceof EmptyBlock
|| sb instanceof ReturnBlock)
&& sb.jump != null)) {
StructuredBlock pred = null;
StructuredBlock jsrBlock = prev.outer;
if (jsrBlock.outer instanceof SequentialBlock) {
if (jsrBlock.outer.getSubBlocks()[1]
== jsrBlock) {
pred =
jsrBlock.outer.getSubBlocks()[0];
pred.replace(jsrBlock.outer,
jsrBlock.outer);
} else if (jsrBlock.outer.outer instanceof
SequentialBlock) {
pred =
jsrBlock.outer.outer
.getSubBlocks()[0];
jsrBlock.outer.getSubBlocks()[1]
.replace(jsrBlock.outer,
jsrBlock.outer);
}
}
if (pred != null) {
if (pred.jump == null)
pred.moveJump(jsrBlock.jump);
else
jsrBlock.removeJump();
} else {
EmptyBlock eb = new EmptyBlock();
eb.moveJump(jsrBlock.jump);
eb.replace(jsrBlock, prev);
}
prev.removeJump();
}
}
}
}
public void checkAndRemoveMonitorExit(LocalInfo local, int end) {
FlowBlock subRoutine = null;
Enumeration enum = successors.elements();
while (enum.hasMoreElements()) {
Jump jump = (Jump)enum.nextElement();
if (jump == null || jump.destination == subRoutine)
continue;
StructuredBlock prev = jump.prev;
if (prev instanceof EmptyBlock
&& prev.outer instanceof JsrBlock
&& subRoutine == null) {
subRoutine = jump.destination;
subRoutine.analyzeSubRoutine(addr+length, end);
if (subRoutine.block instanceof InstructionBlock) {
Instruction instr =
((InstructionBlock)subRoutine.block).getInstruction();
if (instr instanceof ComplexExpression
&& ((ComplexExpression)instr)
.getOperator() instanceof MonitorExitOperator
&& ((ComplexExpression)instr)
.getSubExpressions()[0] instanceof LocalLoadOperator
&& (((LocalLoadOperator) ((ComplexExpression)instr)
.getSubExpressions()[0]).getLocalInfo().getSlot()
== local.getSlot())) {
updateInOut(subRoutine, true);
length += subRoutine.length;
continue;
}
}
}
if (prev instanceof JsrBlock) {
/* The jump is directly preceeded by a jsr.
*/
continue;
}
if (prev instanceof EmptyBlock
&& prev.outer instanceof JsrBlock) {
/* If jump is a jsr check the outer
* block instead.
*/
prev = prev.outer;
}
if ((prev instanceof EmptyBlock
|| prev instanceof ReturnBlock)
&& prev.outer instanceof SequentialBlock) {
SequentialBlock seq = (SequentialBlock) prev.outer;
StructuredBlock pred = null;
if (seq.subBlocks[1] == prev)
pred = seq.subBlocks[0];
else if (seq.outer instanceof SequentialBlock)
pred = seq.outer.getSubBlocks()[0];
if (pred != null) {
if (pred instanceof JsrBlock || pred.jump != null)
/* The jump is preceeded by another jump
* or jsr and last in its block, okay.
*/
continue;
if (pred instanceof InstructionBlock) {
Instruction instr =
((InstructionBlock)pred).getInstruction();
if (instr instanceof ComplexExpression
&& ((ComplexExpression)instr)
.getOperator() instanceof MonitorExitOperator
&& ((ComplexExpression)instr)
.getSubExpressions()[0]
instanceof LocalLoadOperator
&& (((LocalLoadOperator)
((ComplexExpression)instr)
.getSubExpressions()[0]).getLocalInfo()
.getSlot()
== local.getSlot()))
continue;
}
}
/* Now we have a jump with a wrong destination.
* Complain!
*/
System.err.println("non well formed synchronized block");
}
}
enum = successors.elements();
while (enum.hasMoreElements()) {
Jump jump = (Jump)enum.nextElement();
if (jump == null ||
jump.destination != subRoutine)
continue;
StructuredBlock prev = jump.prev;
if (prev instanceof EmptyBlock
&& prev.outer instanceof JsrBlock) {
StructuredBlock sb = prev.outer.getNextBlock();
if (sb == null
|| ((sb instanceof EmptyBlock
|| sb instanceof ReturnBlock)
&& sb.jump != null)) {
StructuredBlock pred = null;
StructuredBlock jsrBlock = prev.outer;
if (jsrBlock.outer instanceof SequentialBlock) {
if (jsrBlock.outer.getSubBlocks()[1] == jsrBlock) {
pred = jsrBlock.outer.getSubBlocks()[0];
pred.replace(jsrBlock.outer, jsrBlock.outer);
} else if (jsrBlock.outer.outer instanceof
SequentialBlock) {
pred = jsrBlock.outer.outer.getSubBlocks()[0];
jsrBlock.outer.getSubBlocks()[1]
.replace(jsrBlock.outer, jsrBlock.outer);
}
}
if (pred != null) {
if (pred.jump == null)
pred.moveJump(jsrBlock.jump);
else
jsrBlock.removeJump();
} else {
EmptyBlock eb = new EmptyBlock();
eb.moveJump(jsrBlock.jump);
eb.replace(jsrBlock, prev);
}
prev.removeJump();
}
}
}
}
/**
* Create a Catch- resp. FinallyBlock (maybe even SynchronizedBlock).
@ -1271,112 +1510,104 @@ public class FlowBlock {
newBlock.setCatchBlock(rawBlock.catchBlock);
lastModified = newBlock;
changed = true;
} else if (catchFlow.block instanceof SequentialBlock) {
SequentialBlock catchBlock = null;
} else if (catchFlow.block instanceof SequentialBlock
&& catchFlow.block.getSubBlocks()[0]
instanceof InstructionBlock) {
SequentialBlock catchBlock = (SequentialBlock) catchFlow.block;
int type = 0;
try {
catchBlock = (SequentialBlock) catchFlow.block;
if (((Expression)((InstructionBlock)catchBlock.subBlocks[0])
.instr).getOperator() instanceof jode.MonitorExitOperator
&& ((ThrowBlock)catchBlock.subBlocks[1]).instr
instanceof jode.NopOperator)
/* This is a synchronized block */
type = 2;
Instruction instr =
((InstructionBlock)catchBlock.subBlocks[0]).instr;
if (instr instanceof ComplexExpression
&& ((ComplexExpression)instr).getOperator()
instanceof MonitorExitOperator
&& ((ComplexExpression)instr).getSubExpressions()[0]
instanceof LocalLoadOperator
&& catchBlock.subBlocks[1] instanceof ThrowBlock
&& ((ThrowBlock)catchBlock.subBlocks[1]).instr
instanceof jode.NopOperator) {
/* This is a synchronized block */
((ThrowBlock)catchBlock.subBlocks[1]).removeJump();
ComplexExpression monexit = (ComplexExpression)
((InstructionBlock) catchBlock.subBlocks[0]).instr;
LocalInfo local =
((LocalLoadOperator)monexit.getSubExpressions()[0])
.getLocalInfo();
checkAndRemoveMonitorExit(local, end);
SynchronizedBlock syncBlock = new SynchronizedBlock(local);
syncBlock.replace(rawBlock, rawBlock);
syncBlock.moveJump(rawBlock.jump);
syncBlock.setBodyBlock(rawBlock.tryBlock);
lastModified = syncBlock;
changed = true;
else if
(((SequentialBlock)catchBlock.subBlocks[1]).subBlocks[0]
} else if (catchBlock.subBlocks[1] instanceof SequentialBlock
&& catchBlock.subBlocks[1].getSubBlocks()[0]
instanceof JsrBlock
&& ((LocalStoreOperator)
((Expression)
((InstructionBlock)catchBlock.subBlocks[0])
.instr).getOperator())
&& instr instanceof LocalStoreOperator
&& catchBlock.subBlocks[1].getSubBlocks()[1]
instanceof ThrowBlock
&& ((ThrowBlock)catchBlock.subBlocks[1]
.getSubBlocks()[1]).instr
instanceof LocalLoadOperator
&& ((LocalStoreOperator) instr)
.matches((LocalLoadOperator)
((Expression)
((ThrowBlock)
((SequentialBlock)catchBlock.subBlocks[1]).
subBlocks[1])
.instr).getOperator()))
/* Wow that was complicated :-)
* But now we know that the catch block looks
* exactly like we exspected.
*/
type = 1;
} catch (ClassCastException ex) {
/* don't do transformations */
}
if (type == 2) {
/* This is a synchronized block */
throw new AssertError ("Synchronized not implemented yet");
} else if (type == 1) {
/* Finally block */
((ThrowBlock)catchBlock.subBlocks[1]
.getSubBlocks()[1]).instr)) {
/* Wow that was complicated :-)
* But now we know that the catch block looks
* exactly like an try finally block.
*/
FlowBlock subRoutine =
((JsrBlock)catchBlock.subBlocks[1].getSubBlocks()[0])
.innerBlock.jump.destination;
/* Now remove the two jumps of the catch block
* so that we can forget about them.
* This are the throw and the jsr.
*/
catchBlock.subBlocks[1].getSubBlocks()[1].removeJump();
catchBlock.subBlocks[1]
.getSubBlocks()[0].getSubBlocks()[0].removeJump();
subRoutine.analyzeSubRoutine(addr+length, end);
updateInOut(subRoutine, true);
length += subRoutine.length;
Enumeration enum = successors.elements();
while (enum.hasMoreElements()) {
Jump jump = (Jump)enum.nextElement();
if (jump != null && jump.destination == subRoutine) {
if (jump.prev instanceof EmptyBlock
&& jump.prev.outer instanceof JsrBlock) {
/* XXX
* Could check much more here!
*/
StructuredBlock prevBlock = null;
StructuredBlock jsrBlock = jump.prev.outer;
if (jsrBlock.outer instanceof SequentialBlock) {
if (jsrBlock.outer.getSubBlocks()[1]
== jsrBlock) {
prevBlock =
jsrBlock.outer.getSubBlocks()[0];
prevBlock.replace(jsrBlock.outer,
jsrBlock.outer);
} else if (jsrBlock.outer.outer instanceof
SequentialBlock) {
prevBlock =
jsrBlock.outer.outer
.getSubBlocks()[0];
jsrBlock.outer.getSubBlocks()[1]
.replace(jsrBlock.outer,
jsrBlock.outer);
}
}
if (prevBlock != null) {
if (prevBlock.jump == null)
prevBlock.moveJump(jsrBlock.jump);
else
jsrBlock.removeJump();
} else {
EmptyBlock eb = new EmptyBlock();
eb.moveJump(jsrBlock.jump);
eb.replace(jsrBlock, jump.prev);
}
jump.prev.removeJump();
} else
throw new AssertError("wrong jsr");
}
}
checkAndRemoveJSR(subRoutine);
CatchFinallyBlock newBlock = new CatchFinallyBlock();
newBlock.replace(rawBlock, rawBlock);
newBlock.setTryBlock(rawBlock.tryBlock);
newBlock.setFinallyBlock(subRoutine.block);
newBlock.moveJump(rawBlock.jump);
lastModified = newBlock;
changed = true;
}
} else if (catchFlow.block instanceof InstructionBlock
&& ((InstructionBlock) catchFlow.block).instr
instanceof PopOperator
&& catchFlow.block.jump != null) {
/* This is a special try/finally-block, where
* the finally block ends with a break, return or
* similar.
*/
CatchFinallyBlock newBlock = new CatchFinallyBlock();
newBlock.replace(rawBlock, rawBlock);
newBlock.setTryBlock(rawBlock.tryBlock);
newBlock.setFinallyBlock(new EmptyBlock());
newBlock.moveJump(rawBlock.jump);
lastModified = newBlock.finallyBlock;
lastModified.moveJump(catchFlow.block.jump);
Enumeration enum = successors.elements();
changed = true;
}
checkConsistent();
if (Decompiler.debugAnalyze)

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