Example usage for org.objectweb.asm Label Label

Introduction

In this page you can find the example usage for org.objectweb.asm Label Label.

Prototype

public Label() 

Source Link

Document

Constructs a new label.

Usage

From source file:fr.insalyon.citi.golo.compiler.JavaBytecodeGenerationGoloIrVisitor.java

License:Apache License

@Override
public void visitConditionalBranching(ConditionalBranching conditionalBranching) {
    Label branchingElseLabel = new Label();
    Label branchingExitLabel = new Label();
    conditionalBranching.getCondition().accept(this);
    asmBooleanValue();//from  ww  w.  j  ava  2  s  . com
    methodVisitor.visitJumpInsn(IFEQ, branchingElseLabel);
    conditionalBranching.getTrueBlock().accept(this);
    if (conditionalBranching.hasFalseBlock()) {
        if (!conditionalBranching.getTrueBlock().hasReturn()) {
            methodVisitor.visitJumpInsn(GOTO, branchingExitLabel);
        }
        methodVisitor.visitLabel(branchingElseLabel);
        conditionalBranching.getFalseBlock().accept(this);
        methodVisitor.visitLabel(branchingExitLabel);
    } else if (conditionalBranching.hasElseConditionalBranching()) {
        if (!conditionalBranching.getTrueBlock().hasReturn()) {
            methodVisitor.visitJumpInsn(GOTO, branchingExitLabel);
        }
        methodVisitor.visitLabel(branchingElseLabel);
        conditionalBranching.getElseConditionalBranching().accept(this);
        methodVisitor.visitLabel(branchingExitLabel);
    } else {
        methodVisitor.visitLabel(branchingElseLabel);
    }
}

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From source file:fr.insalyon.citi.golo.compiler.JavaBytecodeGenerationGoloIrVisitor.java

License:Apache License

@Override
public void visitLoopStatement(LoopStatement loopStatement) {
    // TODO handle init and post statement and potential reference scoping issues
    Label loopStart = new Label();
    Label loopEnd = new Label();
    context.loopStartMap.put(loopStatement, loopStart);
    context.loopEndMap.put(loopStatement, loopEnd);
    if (loopStatement.hasInitStatement()) {
        loopStatement.getInitStatement().accept(this);
    }/*from ww w  .  ja  v a 2 s .  com*/
    methodVisitor.visitLabel(loopStart);
    loopStatement.getConditionStatement().accept(this);
    asmBooleanValue();
    methodVisitor.visitJumpInsn(IFEQ, loopEnd);
    loopStatement.getBlock().accept(this);
    if (loopStatement.hasPostStatement()) {
        loopStatement.getPostStatement().accept(this);
    }
    methodVisitor.visitJumpInsn(GOTO, loopStart);
    methodVisitor.visitLabel(loopEnd);
}

---

From source file:fr.insalyon.citi.golo.compiler.JavaBytecodeGenerationGoloIrVisitor.java

License:Apache License

@Override
public void visitTryCatchFinally(TryCatchFinally tryCatchFinally) {
    Label tryStart = new Label();
    Label tryEnd = new Label();
    Label catchStart = new Label();
    Label catchEnd = new Label();

    Label rethrowStart = null;/*  w  w w  . j  a v  a 2s.  co m*/
    Label rethrowEnd = null;
    if (tryCatchFinally.isTryCatchFinally()) {
        rethrowStart = new Label();
        rethrowEnd = new Label();
    }

    methodVisitor.visitLabel(tryStart);
    tryCatchFinally.getTryBlock().accept(this);
    if (tryCatchFinally.isTryCatch() || tryCatchFinally.isTryCatchFinally()) {
        methodVisitor.visitJumpInsn(GOTO, catchEnd);
    }
    methodVisitor.visitTryCatchBlock(tryStart, tryEnd, catchStart, null);
    methodVisitor.visitLabel(tryEnd);

    if (tryCatchFinally.isTryFinally()) {
        tryCatchFinally.getFinallyBlock().accept(this);
        methodVisitor.visitJumpInsn(GOTO, catchEnd);
    }

    if (tryCatchFinally.isTryCatchFinally()) {
        methodVisitor.visitTryCatchBlock(catchStart, catchEnd, rethrowStart, null);
    }

    methodVisitor.visitLabel(catchStart);
    if (tryCatchFinally.isTryCatch() || tryCatchFinally.isTryCatchFinally()) {
        Block catchBlock = tryCatchFinally.getCatchBlock();
        int exceptionRefIndex = catchBlock.getReferenceTable().get(tryCatchFinally.getExceptionId()).getIndex();
        methodVisitor.visitVarInsn(ASTORE, exceptionRefIndex);
        tryCatchFinally.getCatchBlock().accept(this);
    } else {
        tryCatchFinally.getFinallyBlock().accept(this);
        methodVisitor.visitInsn(ATHROW);
    }
    methodVisitor.visitLabel(catchEnd);

    if (tryCatchFinally.isTryCatchFinally()) {
        tryCatchFinally.getFinallyBlock().accept(this);
        methodVisitor.visitJumpInsn(GOTO, rethrowEnd);
        methodVisitor.visitLabel(rethrowStart);
        tryCatchFinally.getFinallyBlock().accept(this);
        methodVisitor.visitInsn(ATHROW);
        methodVisitor.visitLabel(rethrowEnd);
    }
}

---

From source file:fr.insalyon.citi.golo.compiler.JavaBytecodeGenerationGoloIrVisitor.java

License:Apache License

private void orOperator(BinaryOperation binaryOperation) {
    Label exitLabel = new Label();
    Label trueLabel = new Label();
    binaryOperation.getLeftExpression().accept(this);
    asmBooleanValue();/*from   www .j  ava  2s. c  om*/
    methodVisitor.visitJumpInsn(IFNE, trueLabel);
    binaryOperation.getRightExpression().accept(this);
    asmBooleanValue();
    methodVisitor.visitJumpInsn(IFNE, trueLabel);
    asmFalseObject();
    methodVisitor.visitJumpInsn(GOTO, exitLabel);
    methodVisitor.visitLabel(trueLabel);
    asmTrueObject();
    methodVisitor.visitLabel(exitLabel);
}

---

From source file:fr.insalyon.citi.golo.compiler.JavaBytecodeGenerationGoloIrVisitor.java

License:Apache License

private void andOperator(BinaryOperation binaryOperation) {
    Label exitLabel = new Label();
    Label falseLabel = new Label();
    binaryOperation.getLeftExpression().accept(this);
    asmBooleanValue();// w  ww  .ja  v a 2 s. c  om
    methodVisitor.visitJumpInsn(IFEQ, falseLabel);
    binaryOperation.getRightExpression().accept(this);
    asmBooleanValue();
    methodVisitor.visitJumpInsn(IFEQ, falseLabel);
    asmTrueObject();
    methodVisitor.visitJumpInsn(GOTO, exitLabel);
    methodVisitor.visitLabel(falseLabel);
    asmFalseObject();
    methodVisitor.visitLabel(exitLabel);
}

---

From source file:fr.insalyon.citi.golo.compiler.JavaBytecodeStructGenerator.java

License:Apache License

private void makeSetMethod(ClassWriter classWriter, Struct struct) {
    String owner = struct.getPackageAndClass().toJVMType();
    MethodVisitor visitor = classWriter.visitMethod(ACC_PUBLIC, "set",
            "(Ljava/lang/String;Ljava/lang/Object;)Lgololang/GoloStruct;", null, null);
    visitor.visitCode();/*from w ww  .  j a  v  a 2  s .  com*/
    insertPrivateElementCheck(struct, visitor);
    Label nextCase = new Label();
    for (String member : struct.getMembers()) {
        visitor.visitLdcInsn(member);
        visitor.visitVarInsn(ALOAD, 1);
        visitor.visitJumpInsn(IF_ACMPNE, nextCase);
        visitor.visitVarInsn(ALOAD, 0);
        visitor.visitVarInsn(ALOAD, 2);
        visitor.visitMethodInsn(INVOKEVIRTUAL, owner, member, "(Ljava/lang/Object;)Lgololang/GoloStruct;");
        visitor.visitInsn(ARETURN);
        visitor.visitLabel(nextCase);
        nextCase = new Label();
    }
    insertUnknowElementCode(struct, visitor);
    visitor.visitMaxs(0, 0);
    visitor.visitEnd();
}

---

From source file:fr.insalyon.citi.golo.compiler.JavaBytecodeStructGenerator.java

License:Apache License

private void makeGetMethod(ClassWriter classWriter, Struct struct) {
    String owner = struct.getPackageAndClass().toJVMType();
    MethodVisitor visitor = classWriter.visitMethod(ACC_PUBLIC, "get", "(Ljava/lang/String;)Ljava/lang/Object;",
            null, null);//from   w w w.  j a  v  a 2  s . c  o m
    visitor.visitCode();
    insertPrivateElementCheck(struct, visitor);
    Label nextCase = new Label();
    for (String member : struct.getMembers()) {
        visitor.visitLdcInsn(member);
        visitor.visitVarInsn(ALOAD, 1);
        visitor.visitJumpInsn(IF_ACMPNE, nextCase);
        visitor.visitVarInsn(ALOAD, 0);
        visitor.visitMethodInsn(INVOKEVIRTUAL, owner, member, "()Ljava/lang/Object;");
        visitor.visitInsn(ARETURN);
        visitor.visitLabel(nextCase);
        nextCase = new Label();
    }
    insertUnknowElementCode(struct, visitor);
    visitor.visitMaxs(0, 0);
    visitor.visitEnd();
}

---

From source file:fr.insalyon.citi.golo.compiler.JavaBytecodeStructGenerator.java

License:Apache License

private void insertPrivateElementCheck(Struct struct, MethodVisitor visitor) {
    Label afterPrivateCheck = new Label();
    visitor.visitVarInsn(ALOAD, 1);//from  w  ww  . j  a  v a  2  s.  co m
    visitor.visitLdcInsn("_");
    visitor.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "startsWith", "(Ljava/lang/String;)Z");
    visitor.visitJumpInsn(IFEQ, afterPrivateCheck);
    visitor.visitTypeInsn(NEW, "java/lang/IllegalArgumentException");
    visitor.visitInsn(DUP);
    visitor.visitLdcInsn("Private member of " + struct.getPackageAndClass().toString());
    visitor.visitMethodInsn(INVOKESPECIAL, "java/lang/IllegalArgumentException", "<init>",
            "(Ljava/lang/String;)V");
    visitor.visitInsn(ATHROW);
    visitor.visitLabel(afterPrivateCheck);
}

---

From source file:fr.insalyon.citi.golo.compiler.JavaBytecodeStructGenerator.java

License:Apache License

private void makeEquals(ClassWriter classWriter, Struct struct) {
    String owner = struct.getPackageAndClass().toJVMType();
    MethodVisitor visitor = classWriter.visitMethod(ACC_PUBLIC, "equals", "(Ljava/lang/Object;)Z", null, null);
    Label notFrozenLabel = new Label();
    Label falseLabel = new Label();
    Label sameTypeLabel = new Label();
    visitor.visitCode();/*  w  ww.  j a v  a2  s.  co m*/
    visitor.visitVarInsn(ALOAD, 0);
    visitor.visitFieldInsn(GETFIELD, owner, $_frozen, "Z");
    visitor.visitJumpInsn(IFNE, notFrozenLabel);
    // super.equals()
    visitor.visitVarInsn(ALOAD, 0);
    visitor.visitVarInsn(ALOAD, 1);
    visitor.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "equals", "(Ljava/lang/Object;)Z");
    visitor.visitInsn(IRETURN);
    // The receiver is frozen
    visitor.visitLabel(notFrozenLabel);
    visitor.visitVarInsn(ALOAD, 1);
    visitor.visitTypeInsn(INSTANCEOF, owner);
    visitor.visitJumpInsn(IFNE, sameTypeLabel);
    visitor.visitJumpInsn(GOTO, falseLabel);
    // The argument is of the same type, too
    visitor.visitLabel(sameTypeLabel);
    visitor.visitVarInsn(ALOAD, 1);
    visitor.visitTypeInsn(CHECKCAST, owner);
    visitor.visitFieldInsn(GETFIELD, owner, $_frozen, "Z");
    visitor.visitJumpInsn(IFEQ, falseLabel);
    // The argument is not frozen
    for (String member : struct.getMembers()) {
        visitor.visitVarInsn(ALOAD, 0);
        visitor.visitFieldInsn(GETFIELD, owner, member, "Ljava/lang/Object;");
        visitor.visitVarInsn(ALOAD, 1);
        visitor.visitTypeInsn(CHECKCAST, owner);
        visitor.visitFieldInsn(GETFIELD, owner, member, "Ljava/lang/Object;");
        visitor.visitMethodInsn(INVOKESTATIC, "java/util/Objects", "equals",
                "(Ljava/lang/Object;Ljava/lang/Object;)Z");
        visitor.visitJumpInsn(IFEQ, falseLabel);
    }
    visitor.visitInsn(ICONST_1);
    visitor.visitInsn(IRETURN);
    // False
    visitor.visitLabel(falseLabel);
    visitor.visitInsn(ICONST_0);
    visitor.visitInsn(IRETURN);
    visitor.visitMaxs(0, 0);
    visitor.visitEnd();
}

---

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