git-svn-id: https://svn.code.sf.net/p/jode/code/trunk@10 379699f6-c40d-0410-875b-85095c16579estable
jochen
27 years ago
parent
6951265a2d
commit
f3f21e7d2c
@ -0,0 +1,37 @@ |
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package jode; |
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|
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public class CreateBreakStatement implements Transformation { |
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public InstructionHeader transform(InstructionHeader ih) { |
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InstructionHeader breakDest; |
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if (ih.getFlowType() == ih.GOTO) |
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breakDest = ih.successors[0]; |
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else if (ih.getFlowType() == ih.IFGOTO) |
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breakDest = ih.successors[1]; |
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else |
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return null; |
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boolean needBreakLabel = false, needContLabel = false; |
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InstructionHeader outer = ih.outer; |
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while (outer != null) { |
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if (outer.getBreak() == breakDest) { |
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if (Decompiler.isVerbose) |
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System.err.print("b"); |
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return new BreakInstructionHeader |
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(ih, needBreakLabel?outer.getLabel(): null, true); |
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} |
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if (outer.getContinue() == breakDest) { |
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if (Decompiler.isVerbose) |
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System.err.print("b"); |
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return new BreakInstructionHeader |
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(ih, needContLabel?outer.getLabel(): null, false); |
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} |
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if (outer.getBreak() != null) |
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needBreakLabel = true; |
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if (outer.getContinue() != null) |
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needContLabel = true; |
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outer = outer.outer; |
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} |
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return null; |
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} |
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} |
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@ -0,0 +1,84 @@ |
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package jode; |
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import java.util.Enumeration; |
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public class CreateSwitchStatements implements Transformation { |
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public InstructionHeader transform(InstructionHeader ih) { |
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if (ih.getFlowType() != ih.SWITCH) |
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return null; |
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SimpleSwitchInstructionHeader switchIH = |
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(SimpleSwitchInstructionHeader) ih; |
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int defaultCase = switchIH.successors.length - 1; |
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int addr = switchIH.nextInstruction.addr; |
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int count = 1; |
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for (int i=0; i < switchIH.successors.length; i++) { |
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if (switchIH.successors[i].addr < addr) |
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return null; |
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if (switchIH.successors[i] != switchIH.successors[defaultCase]) |
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count ++; |
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} |
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|
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int[] cases = new int[count]; |
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InstructionHeader[] sorted = new InstructionHeader[count]; |
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count = 0; |
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for (int i=0; i < switchIH.successors.length; i++) { |
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if (i != defaultCase && |
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switchIH.successors[i] == switchIH.successors[defaultCase]) |
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continue; |
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int insert; |
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for (insert = 0; insert < count; insert++) { |
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if (sorted[insert].addr > switchIH.successors[i].addr) |
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break; |
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} |
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if (insert < count) { |
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System.arraycopy(cases, insert, |
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cases, insert+1, count-insert); |
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System.arraycopy(sorted, insert, |
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sorted, insert+1, count-insert); |
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} |
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if (i == defaultCase) |
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defaultCase = insert; |
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else |
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cases[insert] = switchIH.cases[i]; |
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sorted[insert] = switchIH.successors[i]; |
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count++; |
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} |
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InstructionHeader endBlock = switchIH.outer.endBlock; |
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ih = sorted[count-1]; |
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if (ih.outer == switchIH.outer) { |
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EndSearch: |
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while (ih != null) { |
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Enumeration enum = ih.getPredecessors().elements(); |
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while (enum.hasMoreElements()) { |
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InstructionHeader pred = |
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(InstructionHeader)enum.nextElement(); |
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if (pred.addr < sorted[count-1].addr && |
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(pred.flowType == ih.GOTO || |
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(pred.flowType == ih.IFGOTO && |
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pred.successors[1] == ih))) { |
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endBlock = ih; |
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break EndSearch; |
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} |
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} |
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// if (ih.flowType == ih.GOTO) {
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// /* XXX: while loops in default part versus
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// * while loops after switches
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// */
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// endBlock = ih.successors[0];
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// break EndSearch;
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// }
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ih = ih.nextInstruction; |
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} |
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} else |
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endBlock = ih; |
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if(Decompiler.isVerbose) |
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System.err.print("s"); |
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return new SwitchInstructionHeader |
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(switchIH, cases, sorted, defaultCase, endBlock); |
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} |
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} |
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@ -0,0 +1,77 @@ |
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package jode; |
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import java.util.Enumeration; |
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/** This instruction header represents an break, continue or an |
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* if + break/continue statement. |
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*/ |
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public class BreakInstructionHeader extends InstructionHeader { |
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boolean conditional; |
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boolean isBreak; |
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String breakLabel; |
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/** |
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* Creates a new break statement. |
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* @param gotoHeader the instruction header whichs contains the |
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* (maybe conditonal) goto statement. |
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* @param label the label where to break to, may be null. |
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* @param isBreak is this a break or a continue. |
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*/ |
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public BreakInstructionHeader(InstructionHeader gotoHeader, |
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String label, |
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boolean isBreak) { |
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super(BREAKSTATEMENT, gotoHeader.addr, gotoHeader.nextAddr, |
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gotoHeader.successors, gotoHeader.outer); |
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this.instr = gotoHeader.getInstruction(); |
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this.isBreak = isBreak; |
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this.conditional = (gotoHeader.flowType == IFGOTO); |
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this.breakLabel = label; |
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this.movePredecessors(gotoHeader); |
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this.successors = gotoHeader.successors; |
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for (int i=0; i< successors.length; i++) { |
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successors[i].predecessors.removeElement(gotoHeader); |
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successors[i].predecessors.addElement(this); |
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} |
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this.nextInstruction = gotoHeader.nextInstruction; |
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if (nextInstruction != null) |
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nextInstruction.prevInstruction = this; |
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} |
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public void dumpSource(TabbedPrintWriter writer) |
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throws java.io.IOException |
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{ |
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if (Decompiler.isDebugging) { |
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dumpDebugging(writer); |
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writer.tab(); |
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} |
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if (needsLabel()) { |
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writer.untab(); |
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writer.println(getLabel()+": "); |
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writer.tab(); |
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} |
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if (conditional) { |
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writer.println("if ("+instr.toString()+")"); |
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writer.tab(); |
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} else { |
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if (!(instr instanceof NopOperator)) { |
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if (instr.getType() != MyType.tVoid) |
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writer.print("push "); |
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writer.println(instr.toString()+";"); |
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} |
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} |
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writer.println((isBreak?"break":"continue") + |
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(breakLabel != null?" "+breakLabel:"")+";"); |
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if (conditional) |
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writer.untab(); |
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if (Decompiler.isDebugging) |
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writer.untab(); |
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} |
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} |
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@ -0,0 +1,181 @@ |
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package jode; |
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import java.util.Enumeration; |
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/** |
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* This instruction header represents an if instruction. The |
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* linkage of the instructions is as follow: |
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* <pre> |
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* A: .... |
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* <p> |
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* prev = A, next = H, pred = normal, succ = {C,E} |
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* B: switch ( value ) { |
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* <p> |
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* case 1: |
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* <p> |
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* prev = null, next = D, pred = {B}, succ = {D} |
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* C: then-instr 1 |
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* <p> |
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* prev = C, next = H!, pred = normal succ = {E} |
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* D: instructions of then part |
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* <p> |
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* case 2: |
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* <p> |
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* prev = null, next = D, pred = {B}, succ = {D} |
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* E: else-instr 1 |
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* <p> |
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* prev = E, next = null, pred = normal, succ = normal |
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* F: instructions of then part |
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* <p> |
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* } |
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* prev = B, ..., pred = normal, succ = normal |
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* H: ... |
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* </pre> |
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*/ |
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public class SwitchInstructionHeader extends InstructionHeader { |
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int[] cases; |
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int defaultCase; |
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/** |
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* Creates a new if statement. There are several conditions that |
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* must be met: |
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* <ul> |
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* <li><code> ifHeader.successors[0] == thenStart |
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* </code></li> |
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* <li><code> ifHeader.successors[1] == thenEnd.nextInstruction |
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* </code></li> |
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* <li><code> elseStart == null || (thenEnd.flowType = GOTO && |
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* elseEnd.nextInstruction == thenEnd.successors[0]) |
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* </code></li> |
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* <li><code> elseStart == null || elseStart = thenEnd.nextInstruction |
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* </code></li> |
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* <li><code> thenStart.nextInstruction....nextInstruction = thenEnd |
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* </code></li> |
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* <li><code> elseStart.nextInstruction....nextInstruction = elseEnd |
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* </code></li> |
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* </ul> |
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* @param ifHeader the instruction header whichs contains the |
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* if goto statement. |
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* @param cases the values belonging to the case labels. |
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* @param successors the successors of this instruction (the cases). |
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* This array must be sorted from low to high addresses. |
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* @param defaultCase the position of the default case in the array. |
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* @param endBlock the next instruction after this switch statement. |
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*/ |
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public SwitchInstructionHeader(InstructionHeader switchIH, |
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int []cases, |
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InstructionHeader []successors, |
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int defaultCase, |
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InstructionHeader endBlock) { |
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super(SWITCHSTATEMENT, switchIH.addr, endBlock.addr, |
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successors, switchIH.outer); |
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this.instr = switchIH.getInstruction(); |
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this.movePredecessors(switchIH); |
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this.endBlock = endBlock; |
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this.defaultCase = defaultCase; |
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this.cases = cases; |
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/* switchIH may have more succesors than we: |
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* CreateSwitchStatements removes case labels, that are the |
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* default. |
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*/ |
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for (int i=0; i<switchIH.successors.length; i++) |
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switchIH.successors[i].predecessors.removeElement(switchIH); |
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for (int i=0; i<successors.length; i++) |
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successors[i].predecessors.addElement(this); |
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for (int i=0; i<successors.length; i++) { |
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if (successors[i].outer == outer) { |
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if (successors[i].prevInstruction != null) |
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successors[i].prevInstruction.nextInstruction = null; |
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successors[i].prevInstruction = null; |
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} |
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} |
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if (endBlock.outer == outer) { |
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if (endBlock.prevInstruction != null) |
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endBlock.prevInstruction.nextInstruction = null; |
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nextInstruction = endBlock; |
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endBlock.prevInstruction = this; |
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} else { |
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if (endBlock != outer.endBlock) { |
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/* Create a goto after this block, that |
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* jumps to endBlock |
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*/ |
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nextInstruction = new InstructionHeader |
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(GOTO, endBlock.addr, endBlock.addr, |
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new InstructionHeader[1], this); |
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nextInstruction.instr = new NopOperator(MyType.tVoid); |
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nextInstruction.prevInstruction = this; |
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nextInstruction.successors[0] = endBlock; |
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endBlock.predecessors.addElement(nextInstruction); |
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} else |
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nextInstruction = null; |
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} |
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for (int i=0; i < successors.length && successors[i] != endBlock; i++) |
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for (InstructionHeader ih = successors[i]; ih != null; |
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ih = ih.nextInstruction) |
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if (ih.outer == outer) |
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ih.outer = this; |
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} |
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/** |
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* Returns the InstructionHeader where a break of this instruction |
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* would jump to. Does only make sense for do/while/for-loops and |
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* switch instructions. |
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*/ |
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public InstructionHeader getBreak() { |
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return endBlock; |
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} |
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public void dumpSource(TabbedPrintWriter writer) |
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throws java.io.IOException |
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{ |
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if (Decompiler.isDebugging) { |
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dumpDebugging(writer); |
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writer.tab(); |
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} |
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if (needsLabel()) { |
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writer.untab(); |
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writer.println(getLabel()+": "); |
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writer.tab(); |
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} |
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writer.println("switch (" + instr.toString() + ") {"); |
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for (int i=0; i<successors.length; i++) { |
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if (i != defaultCase) |
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writer.println("case "+cases[i]+":"); |
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if (successors[i] == endBlock) |
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break; |
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if (i+1 < successors.length && successors[i] == successors[i+1]) |
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continue; |
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if (i == defaultCase) |
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writer.println("default:"); |
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writer.tab(); |
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for (InstructionHeader ih = successors[i]; ih != null; |
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ih = ih.nextInstruction) |
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ih.dumpSource(writer); |
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writer.untab(); |
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} |
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writer.println("} "); |
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if (Decompiler.isDebugging) |
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writer.untab(); |
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} |
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public InstructionHeader doTransformations(Transformation[] trafo) { |
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InstructionHeader next; |
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for (int i=0; i < successors.length && successors[i] != endBlock; i++) |
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for (InstructionHeader ih = successors[i]; ih != null; ih = next) { |
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if ((next = ih.doTransformations(trafo)) == null) |
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next = ih.getNextInstruction(); |
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} |
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return super.doTransformations(trafo); |
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} |
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} |
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