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:com.xruby.compiler.codegen.RubyCompilerImpl.java

License:BSD License

public Object visitAfterWhenConditionNotNil(Object case_value) {
    int i = (Integer) case_value;
    MethodGenerator mg = cg_.getMethodGenerator();
    mg.loadLocal(i);/*from  w  ww .  jav  a2 s.c om*/
    mg.RubyAPI_testCaseEqualNotNil();

    Label label = new Label();
    mg.ifZCmp(GeneratorAdapter.EQ, label);
    return label;
}

From source file:com.xruby.compiler.codegen.RubyCompilerImpl.java

License:BSD License

public Object visitAfterUnlessCondition() {
    MethodGenerator mg = cg_.getMethodGenerator();
    mg.RubyValue_isTrue();/*from w  w  w .jav a2  s. c om*/
    Label label = new Label();
    mg.ifZCmp(GeneratorAdapter.NE, label);
    return label;
}

From source file:com.xruby.compiler.codegen.RubyCompilerImpl.java

License:BSD License

public Object visitBodyBegin(boolean has_ensure) {
    //once exceptio is thrown, everything already on the stack will be destoried. so if we have begin..end
    //in the method parameter. e.g. f(..., begin ..end, ...), the method receiver and parameter is already on the list.
    MethodGenerator mg = cg_.getMethodGenerator();
    mg.saveCurrentVariablesOnStack();/* ww  w . jav  a  2  s  .  c  o m*/

    mg.getEnsureLabelManager().openNewScope();
    if (has_ensure) {
        mg.getEnsureLabelManager().setCurrentFinally(new Label());
    }
    mg.mark(mg.getEnsureLabelManager().getCurrentRetry());
    return mg.getEnsureLabelManager().getCurrentRetry();
}

From source file:com.xruby.compiler.codegen.RubyCompilerImpl.java

License:BSD License

public Object visitPrepareEnsure1() {
    Label label = new Label();
    MethodGenerator mg = cg_.getMethodGenerator();
    mg.visitJumpInsn(Opcodes.JSR, mg.getEnsureLabelManager().getCurrentFinally());
    return label;
}

From source file:com.xruby.compiler.codegen.RubyCompilerImpl.java

License:BSD License

public Object visitPrepareEnsure() {
    Label after_exception = new Label();
    cg_.getMethodGenerator().goTo(after_exception);
    return after_exception;
}

From source file:com.xruby.compiler.codegen.RubyCompilerImpl.java

License:BSD License

public Object visitRescueVariable(String name, int exception_variable) {
    MethodGenerator mg = cg_.getMethodGenerator();
    mg.loadLocal(exception_variable);//w ww  .j  av a  2 s.c o  m
    mg.RubyAPI_testExceptionType();
    Label label = new Label();
    mg.ifZCmp(GeneratorAdapter.EQ, label);

    if (null != name) {
        mg.loadLocal(exception_variable);
        mg.RubyAPI_convertRubyException2RubyValue();
        cg_.storeVariable(name);
    }

    return label;
}

From source file:com.xruby.compiler.codegen.RubyCompilerImpl.java

License:BSD License

public void visitPotentialProcCall() {
    MethodGenerator mg = cg_.getMethodGenerator();
    mg.dup();//  w  ww  .ja  v  a 2  s  .  co  m
    mg.instanceOf(Types.RUBY_PROC_TYPE);

    Label label1 = new Label();
    mg.ifZCmp(GeneratorAdapter.EQ, label1);

    mg.dup();
    mg.checkCast(Types.RUBY_PROC_TYPE);

    //check if in the right context
    //TODO have not considered all the situations
    mg.dup();
    mg.RubyProc_isDefinedInAnotherBlock();
    Label label2 = new Label();
    mg.ifZCmp(GeneratorAdapter.NE, label2);

    cg_.addVariableToBinding();//TODO should we use updateBinding()?
    mg.mark(label2);
    mg.pop();

    mg.mark(label1);
}

From source file:com.yahoo.yqlplus.engine.internal.bytecode.ClassAdapterGenerator.java

private void generateGetProperty(TypeWidget targetType, final PropertyAdapter propertyAdapter) {
    MethodGenerator method = createStaticMethod("getProperty");
    method.setReturnType(AnyTypeWidget.getInstance());
    final BytecodeExpression targetExpr = method.addArgument("target", targetType).read();
    final BytecodeExpression propertyName = method.addArgument("property", BaseTypeAdapter.STRING).read();
    method.add(new BytecodeSequence() {
        @Override//  ww w .  j a  va2 s .c  om
        public void generate(CodeEmitter code) {
            Map<String, Label> labelMap = Maps.newLinkedHashMap();
            Label defaultCase = new Label();
            Label done = new Label();
            for (PropertyAdapter.Property property : propertyAdapter.getProperties()) {
                labelMap.put(property.name, new Label());
            }
            propertyName.generate(code);
            code.emitStringSwitch(labelMap, defaultCase, true);
            MethodVisitor mv = code.getMethodVisitor();
            for (PropertyAdapter.Property property : propertyAdapter.getProperties()) {
                mv.visitLabel(labelMap.get(property.name));
                propertyAdapter.property(targetExpr, property.name).read().generate(code);
                code.box(property.type);
                mv.visitJumpInsn(Opcodes.GOTO, done);
            }
            mv.visitLabel(defaultCase);
            new NullExpr(AnyTypeWidget.getInstance()).generate(code);
            mv.visitLabel(done);
            mv.visitInsn(Opcodes.ARETURN);
        }
    });
}

From source file:com.yahoo.yqlplus.engine.internal.bytecode.ClassAdapterGenerator.java

private void generatePutProperty(TypeWidget targetType, final PropertyAdapter propertyAdapter) {
    MethodGenerator method = createStaticMethod("putProperty");
    final BytecodeExpression targetExpr = method.addArgument("target", targetType).read();
    final BytecodeExpression propertyName = method.addArgument("property", BaseTypeAdapter.STRING).read();
    final BytecodeExpression valueExpr = method.addArgument("value", AnyTypeWidget.getInstance()).read();
    method.add(new BytecodeSequence() {
        @Override//from ww  w  .  jav a  2 s.com
        public void generate(CodeEmitter code) {
            Map<String, Label> labelMap = Maps.newLinkedHashMap();
            Label done = new Label();
            for (PropertyAdapter.Property property : propertyAdapter.getProperties()) {
                labelMap.put(property.name, new Label());
            }
            propertyName.generate(code);
            code.emitStringSwitch(labelMap, done, true);
            MethodVisitor mv = code.getMethodVisitor();
            for (PropertyAdapter.Property property : propertyAdapter.getProperties()) {
                mv.visitLabel(labelMap.get(property.name));
                AssignableValue av = propertyAdapter.property(targetExpr, property.name);
                try {
                    code.exec(av.write(new BytecodeCastExpression(property.type, valueExpr)));
                } catch (UnsupportedOperationException ignored) {
                    // can't write what isn't writable
                }
                mv.visitJumpInsn(Opcodes.GOTO, done);
            }
            mv.visitLabel(done);
            mv.visitInsn(Opcodes.RETURN);
        }
    });
}

From source file:com.yahoo.yqlplus.engine.internal.bytecode.CodeEmitterTest.java

@Test
public void requireSimpleAdd() throws Exception {
    UnitGenerator unit = new UnitGenerator("foo", source);
    unit.addInterface(Callable.class);
    MethodGenerator gen = unit.createMethod("call");
    gen.setReturnType(AnyTypeWidget.getInstance());
    final BytecodeExpression leftExpr = source.constant(1);
    final BytecodeExpression rightExpr = source.constant(1);

    gen.add(new BytecodeSequence() {
        @Override/*from w ww  . j  av  a  2s  .c  om*/
        public void generate(CodeEmitter code) {
            Label hasNull = new Label();
            CodeEmitter.Unification unify = code.unifiedEmit(leftExpr, rightExpr, hasNull);
            code.getMethodVisitor().visitInsn(Opcodes.IADD);
            code.box(BaseTypeAdapter.INT32);
            code.getMethodVisitor().visitInsn(Opcodes.ARETURN);
            if (unify.nullPossible) {
                code.getMethodVisitor().visitLabel(hasNull);
                code.getMethodVisitor().visitInsn(Opcodes.ACONST_NULL);
                code.getMethodVisitor().visitInsn(Opcodes.ARETURN);
            }
        }
    });

    source.build();
    Class<? extends Callable> clazz = (Class<? extends Callable>) source.getGeneratedClass(unit);
    Callable c = clazz.newInstance();
    Assert.assertEquals(2, c.call());
}