Examples with Expression de.mirkosertic.bytecoder.ssa.Expression used on opensource projects

Example 1 with Expression

use of de.mirkosertic.bytecoder.ssa.Expression in project Bytecoder by mirkosertic.

the class RedundantAssignmentOptimizer method visit.

@Override
protected void visit(ControlFlowGraph aGraph, ExpressionList aList, Expression aExpression, BytecodeLinkerContext aLinkerContext) {
    // Check if a variable assignment is before the current expression
    Expression theBefore = aList.predecessorOf(aExpression);
    if (theBefore instanceof VariableAssignmentExpression) {
        VariableAssignmentExpression theAssignment = (VariableAssignmentExpression) theBefore;
        Variable theVariable = theAssignment.getVariable();
        Value theValue = theAssignment.getValue();
        // Check if there is only one data flow
        List<Edge> theDataEdges = theVariable.outgoingEdges(DataFlowEdgeType.filter()).collect(Collectors.toList());
        if (theDataEdges.size() == 1) {
            List<Value> theIncomingData = aExpression.incomingDataFlows();
            if (theIncomingData.contains(theVariable)) {
                aExpression.replaceIncomingDataEdge(theVariable, theValue);
                aList.remove(theAssignment);
                aGraph.getProgram().deleteVariable(theVariable);
            }
        }
    }
}

Example 2 with Expression

use of de.mirkosertic.bytecoder.ssa.Expression in project Bytecoder by mirkosertic.

the class Relooper method debugPrint.

private void debugPrint(PrintStream aStream, int aInset, ExpressionList aExpressionList) {
    for (Expression theExpression : aExpressionList.toList()) {
        if (theExpression instanceof BreakExpression) {
            BreakExpression theBreak = (BreakExpression) theExpression;
            printInset(aStream, aInset);
            aStream.println("Break " + theBreak.blockToBreak().name() + " and jump to " + theBreak.jumpTarget().getAddress());
        } else if (theExpression instanceof ContinueExpression) {
            ContinueExpression theContinue = (ContinueExpression) theExpression;
            printInset(aStream, aInset);
            aStream.println("Continue at " + theContinue.labelToReturnTo().name());
        } else if (theExpression instanceof ReturnExpression) {
            printInset(aStream, aInset);
            aStream.println("Return");
        } else if (theExpression instanceof GotoExpression) {
            throw new IllegalStateException("Goto should have been removed!");
        }
    }
}

Example 3 with Expression

use of de.mirkosertic.bytecoder.ssa.Expression in project Bytecoder by mirkosertic.

the class Relooper method replaceGotosIn.

private void replaceGotosIn(Stack<Block> aTraversalStack, Block aBlock) {
    if (aBlock == null) {
        return;
    }
    if (aBlock instanceof SimpleBlock) {
        SimpleBlock theSimple = (SimpleBlock) aBlock;
        aTraversalStack.push(theSimple);
        RegionNode theInternalLabel = theSimple.internalLabel();
        replaceGotosIn(aTraversalStack, theSimple, theInternalLabel, theInternalLabel.getExpressions());
        replaceGotosIn(aTraversalStack, theSimple.next());
        aTraversalStack.pop();
        RegionNode theNode = theSimple.internalLabel;
        Expression theLastExpression = theNode.getExpressions().lastExpression();
        // can be silent, they only need to set the __label__ variable
        if (theLastExpression instanceof BreakExpression) {
            BreakExpression theBreak = (BreakExpression) theLastExpression;
            if (Objects.equals(theBreak.blockToBreak().name(), theSimple.label().name())) {
                theBreak.silent();
            }
        }
        return;
    }
    if (aBlock instanceof LoopBlock) {
        LoopBlock theLoop = (LoopBlock) aBlock;
        aTraversalStack.push(theLoop);
        replaceGotosIn(aTraversalStack, theLoop.inner());
        replaceGotosIn(aTraversalStack, theLoop.next());
        aTraversalStack.pop();
        return;
    }
    if (aBlock instanceof MultipleBlock) {
        MultipleBlock theMultiple = (MultipleBlock) aBlock;
        aTraversalStack.push(theMultiple);
        for (Block theHandler : theMultiple.handlers()) {
            replaceGotosIn(aTraversalStack, theHandler);
        }
        replaceGotosIn(aTraversalStack, theMultiple.next());
        aTraversalStack.pop();
        return;
    }
    throw new IllegalStateException("Don't know how to handle " + aBlock);
}

Example 4 with Expression

use of de.mirkosertic.bytecoder.ssa.Expression in project Bytecoder by mirkosertic.

the class Relooper method replaceGotosIn.

private void replaceGotosIn(Stack<Block> aTraversalStack, SimpleBlock aCurrent, RegionNode aLabel, ExpressionList aList) {
    for (Expression theExpression : aList.toList()) {
        if (theExpression instanceof ExpressionListContainer) {
            ExpressionListContainer theContainer = (ExpressionListContainer) theExpression;
            for (ExpressionList theList : theContainer.getExpressionLists()) {
                replaceGotosIn(aTraversalStack, aCurrent, aLabel, theList);
            }
        }
        if (theExpression instanceof GotoExpression) {
            GotoExpression theGoto = (GotoExpression) theExpression;
            boolean theGotoFound = false;
            // We search the successor edge
            for (Map.Entry<RegionNode.Edge, RegionNode> theSuc : aLabel.getSuccessors().entrySet()) {
                if (Objects.equals(theSuc.getValue().getStartAddress(), theGoto.getJumpTarget())) {
                    theGotoFound = true;
                    RegionNode theTarget = theSuc.getValue();
                    // We found the matching edge
                    if (theSuc.getKey().getType() == RegionNode.EdgeType.NORMAL) {
                        // We can only branch to the next block
                        // We search the whole hiararchy to find the right block to break out
                        boolean theSomethingFound = false;
                        for (int i = aTraversalStack.size() - 1; i >= 0; i--) {
                            Block theNestingBlock = aTraversalStack.get(i);
                            if (theNestingBlock.next() != null && theNestingBlock.next().entries().contains(theTarget)) {
                                theNestingBlock.requireLabel();
                                BreakExpression theBreak = new BreakExpression(theNestingBlock.label(), theTarget.getStartAddress());
                                aList.replace(theGoto, theBreak);
                                if (theNestingBlock.next() instanceof SimpleBlock && theNestingBlock.next().entries().size() == 1) {
                                    theBreak.noSetRequired();
                                }
                                theSomethingFound = true;
                                break;
                            } else if (theNestingBlock.entries().contains(theTarget)) {
                                theNestingBlock.requireLabel();
                                ContinueExpression theContinue = new ContinueExpression(theNestingBlock.label(), theTarget.getStartAddress());
                                aList.replace(theGoto, theContinue);
                                theSomethingFound = true;
                                break;
                            }
                        }
                        if (!theSomethingFound) {
                            throw new IllegalStateException("Failed to jump to " + theTarget.getStartAddress().getAddress() + " from " + aCurrent.label().name() + " : no matching entry found!");
                        }
                    } else {
                        // We can only branch back into the known stack of nested blocks
                        boolean theSomethingFound = false;
                        for (Block theNestingBlock : aTraversalStack) {
                            if (theNestingBlock.entries().contains(theTarget)) {
                                theSomethingFound = true;
                                // We can return to the target in the hierarchy
                                theNestingBlock.requireLabel();
                                ContinueExpression theContinue = new ContinueExpression(theNestingBlock.label(), theTarget.getStartAddress());
                                aList.replace(theGoto, theContinue);
                                break;
                            }
                        }
                        if (!theSomethingFound) {
                            throw new IllegalStateException("No back edge target found for " + theTarget.getStartAddress().getAddress());
                        }
                    }
                }
            }
            if (!theGotoFound) {
                throw new IllegalStateException("No GOTO possible for " + theGoto.getJumpTarget().getAddress() + " in label " + aCurrent.label().name());
            }
        }
    }
}

Example 5 with Expression

use of de.mirkosertic.bytecoder.ssa.Expression in project Bytecoder by mirkosertic.

the class OpenCLWriter method writeExpressions.

private void writeExpressions(ExpressionList aList) {
    for (Expression theExpression : aList.toList()) {
        if (options.isDebugOutput()) {
            String theComment = theExpression.getComment();
            if (theComment != null && !theComment.isEmpty()) {
                print("// ");
                println(theComment);
            }
        }
        if (theExpression instanceof VariableAssignmentExpression) {
            VariableAssignmentExpression theInit = (VariableAssignmentExpression) theExpression;
            Variable theVariable = theInit.getVariable();
            Value theValue = theInit.getValue();
            if (theVariable.resolveType().isObject() && theValue instanceof InvocationExpression) {
                print(toType(theVariable.resolveType(), false));
                print(" ");
                print(theVariable.getName());
                print("_temp = ");
                printValue(theValue);
                println(";");
                print(theVariable.getName());
                print(" = &");
                print(theVariable.getName());
                println("_temp;");
            } else {
                print(theVariable.getName());
                print(" = ");
                printValue(theValue);
                println(";");
            }
        } else if (theExpression instanceof ArrayStoreExpression) {
            ArrayStoreExpression theStore = (ArrayStoreExpression) theExpression;
            List<Value> theIncomingData = theStore.incomingDataFlows();
            Value theArray = theIncomingData.get(0);
            Value theIndex = theIncomingData.get(1);
            Value theValue = theIncomingData.get(2);
            printValue(theArray);
            print("[");
            printValue(theIndex);
            print("] = ");
            printValue(theValue);
            println(";");
        } else if (theExpression instanceof IFExpression) {
            IFExpression theE = (IFExpression) theExpression;
            print("if ");
            printValue(theE.incomingDataFlows().get(0));
            println(" {");
            withDeeperIndent().writeExpressions(theE.getExpressions());
            println("}");
        } else if (theExpression instanceof BreakExpression) {
            BreakExpression theBreak = (BreakExpression) theExpression;
            if (theBreak.isSetLabelRequired()) {
                print("$__label__ = ");
                print(theBreak.jumpTarget().getAddress());
                println(";");
            }
            if (!theBreak.isSilent()) {
                print("goto $");
                print(theBreak.blockToBreak().name());
                println("_next;");
            }
        } else if (theExpression instanceof ContinueExpression) {
            ContinueExpression theContinue = (ContinueExpression) theExpression;
            print("$__label__ = ");
            print(theContinue.jumpTarget().getAddress());
            println(";");
            print("goto $");
            print(theContinue.labelToReturnTo().name());
            println(";");
        } else if (theExpression instanceof ReturnExpression) {
            println("return;");
        } else if (theExpression instanceof PutFieldExpression) {
            PutFieldExpression thePutField = (PutFieldExpression) theExpression;
            List<Value> theIncomingData = thePutField.incomingDataFlows();
            Value theTarget = theIncomingData.get(0);
            BytecodeFieldRefConstant theField = thePutField.getField();
            Value thevalue = theIncomingData.get(1);
            printValue(theTarget);
            printInstanceFieldReference(theField);
            print(" = ");
            printValue(thevalue);
            println(";");
        } else if (theExpression instanceof ReturnValueExpression) {
            ReturnValueExpression theReturn = (ReturnValueExpression) theExpression;
            List<Value> theIncomingData = theReturn.incomingDataFlows();
            print("return ");
            printValue(theIncomingData.get(0));
            println(";");
        } else {
            throw new IllegalArgumentException("Not supported. " + theExpression);
        }
    }
}