Java Code Examples for org.objectweb.asm.MethodVisitor#visitLabel()
The following examples show how to use
org.objectweb.asm.MethodVisitor#visitLabel() .
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Example 1
| Source File: UserlibCollisionTest.java From AVM with MIT License | 6 votes |
|
private static byte[] getAvmPackageClassBytes() {
ClassWriter classWriter = new ClassWriter(0);
MethodVisitor methodVisitor;
classWriter.visit(V10, ACC_PUBLIC | ACC_SUPER, "avm/Main", null, "java/lang/Object", null);
classWriter.visitSource("Main.java", null);
{
methodVisitor = classWriter.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
methodVisitor.visitCode();
Label label0 = new Label();
methodVisitor.visitLabel(label0);
methodVisitor.visitLineNumber(3, label0);
methodVisitor.visitVarInsn(ALOAD, 0);
methodVisitor.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
methodVisitor.visitInsn(RETURN);
methodVisitor.visitMaxs(1, 1);
methodVisitor.visitEnd();
}
classWriter.visitEnd();
return classWriter.toByteArray();
}
Example 2
| Source File: BooleanCompareExpression.java From yql-plus with Apache License 2.0 | 6 votes |
|
@Override
public void generate(CodeEmitter code) {
code.exec(new CompareExpression(loc, leftExpr, rightExpr));
MethodVisitor mv = code.getMethodVisitor();
Label isTrue = new Label();
Label done = new Label();
switch (booleanComparison) {
case LT:
mv.visitJumpInsn(Opcodes.IFLT, isTrue);
break;
case LTEQ:
mv.visitJumpInsn(Opcodes.IFLE, isTrue);
break;
case GT:
mv.visitJumpInsn(Opcodes.IFGT, isTrue);
break;
case GTEQ:
mv.visitJumpInsn(Opcodes.IFGE, isTrue);
break;
}
code.emitBooleanConstant(false);
mv.visitJumpInsn(Opcodes.GOTO, done);
mv.visitLabel(isTrue);
code.emitBooleanConstant(true);
mv.visitLabel(done);
}
Example 3
| Source File: WhileTests.java From Despector with MIT License | 6 votes |
|
@Test
public void testWhileInverse() {
TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(I)V");
MethodVisitor mv = builder.getGenerator();
Label start = new Label();
mv.visitLabel(start);
Label end = new Label();
Label l1 = new Label();
Label l2 = new Label();
mv.visitJumpInsn(GOTO, l2);
mv.visitLabel(l1);
mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
mv.visitLabel(l2);
mv.visitVarInsn(ILOAD, 0);
mv.visitInsn(ICONST_5);
mv.visitJumpInsn(IF_ICMPLT, l1);
mv.visitLabel(end);
mv.visitInsn(RETURN);
mv.visitLocalVariable("i", "I", null, start, end, 0);
String insn = TestHelper.getAsString(builder.finish(), "test_mth");
String good = "while (i < 5) {\n"
+ " org.spongepowered.test.decompile.WhileTests.body();\n"
+ "}";
Assert.assertEquals(good, insn);
}
Example 4
| Source File: Globalizer.java From Concurnas with MIT License | 6 votes |
|
private static void addstaticFinalVars(MethodVisitor mv, ArrayList<FieldVisitorHolder> staticFinalVars, String putTo) {
for(FieldVisitorHolder sfv : staticFinalVars) {
mv.visitLabel(new Label());
mv.visitVarInsn(ALOAD, 0);
switch(sfv.desc) {
case "Ljava/lang/String;": mv.visitLdcInsn(sfv.value.toString()); break;
case "J": BytecodeGenUtils.longOpcode(mv, ((Long)sfv.value).longValue() ); break;
case "F": BytecodeGenUtils.floatOpcode(mv, ((Float)sfv.value).floatValue() ); break;
case "D": BytecodeGenUtils.doubleOpcode(mv, ((Double)sfv.value).doubleValue() ); break;
default: BytecodeGenUtils.intOpcode(mv, ((Integer)sfv.value).intValue() );
}
mv.visitFieldInsn(PUTFIELD, putTo, sfv.name, sfv.desc);
}
}
Example 5
| Source File: OperatorTests.java From Despector with MIT License | 6 votes |
|
@Test
public void testTypeConstant() {
TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(I)V");
MethodVisitor mv = builder.getGenerator();
Label start = new Label();
mv.visitLabel(start);
Label end = new Label();
mv.visitLdcInsn(Type.getType("Ljava/lang/String;"));
mv.visitIntInsn(ASTORE, 0);
mv.visitLabel(end);
mv.visitInsn(RETURN);
mv.visitLocalVariable("i", "Ljava/lang/Class;", null, start, end, 0);
String insn = TestHelper.getAsString(builder.finish(), "test_mth");
String good = "i = String.class;";
Assert.assertEquals(good, insn);
}
Example 6
| Source File: AdviceGenerator.java From glowroot with Apache License 2.0 | 6 votes |
|
private void addOnThrowMethod(ClassWriter cw) {
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "onThrow",
"(Ljava/lang/Throwable;Lorg/glowroot/agent/plugin/api/TraceEntry;)V", null, null);
visitAnnotation(mv, "Lorg/glowroot/agent/plugin/api/weaving/OnThrow;");
checkNotNull(mv.visitParameterAnnotation(0,
"Lorg/glowroot/agent/plugin/api/weaving/BindThrowable;", true)).visitEnd();
checkNotNull(mv.visitParameterAnnotation(1,
"Lorg/glowroot/agent/plugin/api/weaving/BindTraveler;", true)).visitEnd();
mv.visitCode();
if (!config.traceEntryEnabledProperty().isEmpty()) {
mv.visitVarInsn(ALOAD, 1);
Label l0 = new Label();
mv.visitJumpInsn(IFNONNULL, l0);
mv.visitInsn(RETURN);
mv.visitLabel(l0);
}
mv.visitVarInsn(ALOAD, 1);
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKEINTERFACE, "org/glowroot/agent/plugin/api/TraceEntry",
"endWithError", "(Ljava/lang/Throwable;)V", true);
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
Example 7
| Source File: IfTests.java From Despector with MIT License | 6 votes |
|
@Test
public void testElse() {
TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(Z)V");
MethodVisitor mv = builder.getGenerator();
Label start = new Label();
mv.visitLabel(start);
Label end = new Label();
Label else_ = new Label();
mv.visitVarInsn(ILOAD, 0);
mv.visitJumpInsn(IFEQ, else_);
mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
mv.visitJumpInsn(GOTO, end);
mv.visitLabel(else_);
mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
mv.visitLabel(end);
mv.visitInsn(RETURN);
mv.visitLocalVariable("a", "Z", null, start, end, 0);
String insn = TestHelper.getAsString(builder.finish(), "test_mth");
String good = "if (a) {\n"
+ " org.spongepowered.test.decompile.IfTests.body();\n"
+ "} else {\n"
+ " org.spongepowered.test.decompile.IfTests.body();\n"
+ "}";
Assert.assertEquals(good, insn);
}
Example 8
| Source File: BasicTests.java From Despector with MIT License | 6 votes |
|
@Test
public void testNoVoidReturnDeclared() {
TestMethodBuilder builder = new TestMethodBuilder("main", "()V");
MethodVisitor mv = builder.getGenerator();
Label start = new Label();
mv.visitLabel(start);
Label end = new Label();
mv.visitLdcInsn("Hello");
mv.visitVarInsn(ASTORE, 1);
mv.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
mv.visitVarInsn(ALOAD, 1);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V", true);
mv.visitLabel(end);
mv.visitInsn(RETURN);
String insn = KotlinTestHelper.getMethodAsString(builder.finish(), "main");
String good = "fun main() {\n"
+ " val param1: String = \"Hello\"\n"
+ " println(param1)\n"
+ "}";
Assert.assertEquals(good, insn);
}
Example 9
| Source File: TernaryTests.java From Despector with MIT License | 5 votes |
|
@Test
public void testNested2() {
TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(ZIZ)V");
MethodVisitor mv = builder.getGenerator();
Label start = new Label();
mv.visitLabel(start);
Label end = new Label();
Label l1 = new Label();
Label l2 = new Label();
Label l3 = new Label();
mv.visitIntInsn(ILOAD, 0);
mv.visitJumpInsn(IFEQ, l1);
mv.visitInsn(ICONST_3);
mv.visitJumpInsn(GOTO, l2);
mv.visitLabel(l1);
mv.visitIntInsn(ILOAD, 2);
mv.visitJumpInsn(IFEQ, l3);
mv.visitInsn(ICONST_4);
mv.visitJumpInsn(GOTO, l2);
mv.visitLabel(l3);
mv.visitInsn(ICONST_5);
mv.visitLabel(l2);
mv.visitIntInsn(ISTORE, 1);
mv.visitLabel(end);
mv.visitInsn(RETURN);
mv.visitLocalVariable("a", "Z", null, start, end, 0);
mv.visitLocalVariable("i", "I", null, start, end, 1);
mv.visitLocalVariable("b", "Z", null, start, end, 2);
String insn = TestHelper.getAsString(builder.finish(), "test_mth");
String good = "i = a ? 3 : b ? 4 : 5;";
Assert.assertEquals(good, insn);
}
Example 10
| Source File: IfTests.java From Despector with MIT License | 5 votes |
|
@Test
public void testElif() {
TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(ZZ)V");
MethodVisitor mv = builder.getGenerator();
Label start = new Label();
mv.visitLabel(start);
Label end = new Label();
Label else_ = new Label();
Label else2 = new Label();
mv.visitVarInsn(ILOAD, 0);
mv.visitJumpInsn(IFEQ, else_);
mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
mv.visitJumpInsn(GOTO, end);
mv.visitLabel(else_);
mv.visitVarInsn(ILOAD, 1);
mv.visitJumpInsn(IFEQ, else2);
mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
mv.visitJumpInsn(GOTO, end);
mv.visitLabel(else2);
mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
mv.visitLabel(end);
mv.visitInsn(RETURN);
mv.visitLocalVariable("a", "Z", null, start, end, 0);
mv.visitLocalVariable("b", "Z", null, start, end, 1);
String insn = TestHelper.getAsString(builder.finish(), "test_mth");
String good = "if (a) {\n"
+ " org.spongepowered.test.decompile.IfTests.body();\n"
+ "} else if (b) {\n"
+ " org.spongepowered.test.decompile.IfTests.body();\n"
+ "} else {\n"
+ " org.spongepowered.test.decompile.IfTests.body();\n"
+ "}";
Assert.assertEquals(good, insn);
}
Example 11
| Source File: LineNumbersTest.java From JAADAS with GNU General Public License v3.0 | 5 votes |
|
@Override
protected void generate(TraceClassVisitor cw) {
MethodVisitor mv;
cw.visit(V1_1, ACC_PUBLIC + ACC_SUPER, "soot/asm/backend/targets/LineNumbers",
null, "java/lang/Object", null);
cw.visitSource("LineNumbers.java", null);
{
mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitCode();
Label l1 = new Label();
mv.visitLabel(l1);
mv.visitLineNumber(3, l1);
mv.visitVarInsn(ALOAD, 0);
Label l2 = new Label();
mv.visitLabel(l2);
mv.visitLineNumber(3, l2);
mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
Label l3 = new Label();
mv.visitLabel(l3);
mv.visitLineNumber(3, l3);
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
{
mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "main", "([Ljava/lang/String;)V", null, null);
mv.visitCode();
Label l0 = new Label();
mv.visitLabel(l0);
mv.visitLineNumber(6, l0);
mv.visitInsn(RETURN);
mv.visitMaxs(0, 0);
mv.visitEnd();
}
cw.visitEnd();
}
Example 12
| Source File: IfTests.java From Despector with MIT License | 5 votes |
|
@Test
public void testNestedInstanceOf() {
TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(ZLjava/lang/Object;)V");
MethodVisitor mv = builder.getGenerator();
Label start = new Label();
mv.visitLabel(start);
Label end = new Label();
Label l1 = new Label();
mv.visitVarInsn(ILOAD, 0);
mv.visitJumpInsn(IFEQ, end);
mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
mv.visitVarInsn(ILOAD, 1);
mv.visitTypeInsn(INSTANCEOF, THIS_TYPE.getInternalName());
mv.visitJumpInsn(IFEQ, l1);
mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
mv.visitLabel(l1);
mv.visitLabel(end);
mv.visitInsn(RETURN);
mv.visitLocalVariable("a", "Z", null, start, end, 0);
mv.visitLocalVariable("b", "Ljava/lang/Object;", null, start, end, 1);
String insn = TestHelper.getAsString(builder.finish(), "test_mth");
String good = "if (a) {\n"
+ " org.spongepowered.test.decompile.IfTests.body();\n"
+ " if (b instanceof org.spongepowered.test.decompile.IfTests) {\n"
+ " org.spongepowered.test.decompile.IfTests.body();\n"
+ " }\n"
+ "}";
Assert.assertEquals(good, insn);
}
Example 13
| Source File: IfTests.java From Despector with MIT License | 5 votes |
|
@Test
public void testNestedIf2Optimized() {
TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(ZZ)V");
MethodVisitor mv = builder.getGenerator();
Label start = new Label();
mv.visitLabel(start);
Label end = new Label();
Label else_ = new Label();
mv.visitVarInsn(ILOAD, 0);
mv.visitJumpInsn(IFEQ, else_);
mv.visitVarInsn(ILOAD, 1);
mv.visitJumpInsn(IFEQ, end);
mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
mv.visitJumpInsn(GOTO, end);
mv.visitLabel(else_);
mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
mv.visitLabel(end);
mv.visitInsn(RETURN);
mv.visitLocalVariable("a", "Z", null, start, end, 0);
mv.visitLocalVariable("b", "Z", null, start, end, 1);
String insn = TestHelper.getAsString(builder.finish(), "test_mth");
String good = "if (a) {\n"
+ " if (b) {\n"
+ " org.spongepowered.test.decompile.IfTests.body();\n"
+ " }\n"
+ "} else {\n"
+ " org.spongepowered.test.decompile.IfTests.body();\n"
+ "}";
Assert.assertEquals(good, insn);
}
Example 14
| Source File: LoopingExceptionStrippingVisitorTest.java From AVM with MIT License | 5 votes |
|
@Test
public void testBackwardFinally() throws Exception {
String testClassName = "TestClass";
ClassWriter writer = new ClassWriter(0);
TryCatchCountingVisitor counter = new TryCatchCountingVisitor(writer);
LoopingExceptionStrippingVisitor visitor = new LoopingExceptionStrippingVisitor();
visitor.setDelegate(counter);
visitor.visit(Opcodes.V10, Opcodes.ACC_PUBLIC | Opcodes.ACC_SUPER, testClassName, null, "java/lang/Object", null);
// Create our labels.
Label methodStart = new Label();
Label start = new Label();
Label end = new Label();
Label handler = new Label();
String type = null;
// Write a target method.
MethodVisitor methodVisitor = visitor.visitMethod(Opcodes.ACC_STATIC, "targetMethod", "()V", null, null);
methodVisitor.visitCode();
methodVisitor.visitJumpInsn(Opcodes.GOTO, methodStart);
methodVisitor.visitLabel(handler);
methodVisitor.visitInsn(Opcodes.POP);
methodVisitor.visitInsn(Opcodes.RETURN);
methodVisitor.visitLabel(methodStart);
methodVisitor.visitInsn(Opcodes.ACONST_NULL);
methodVisitor.visitInsn(Opcodes.POP);
methodVisitor.visitLabel(start);
methodVisitor.visitInsn(Opcodes.ACONST_NULL);
methodVisitor.visitInsn(Opcodes.POP);
methodVisitor.visitInsn(Opcodes.RETURN);
methodVisitor.visitLabel(end);
methodVisitor.visitTryCatchBlock(start, end, handler, type);
methodVisitor.visitMaxs(1, 0);
methodVisitor.visitEnd();
// Finish.
visitor.visitEnd();
Assert.assertEquals(0, counter.counter);
}
Example 15
| Source File: IfTests.java From Despector with MIT License | 5 votes |
|
@Test
public void testMultipleAnd() {
TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(ZZZ)V");
MethodVisitor mv = builder.getGenerator();
Label start = new Label();
mv.visitLabel(start);
Label ret = new Label();
Label body = new Label();
mv.visitVarInsn(ILOAD, 0);
mv.visitJumpInsn(IFEQ, ret);
mv.visitVarInsn(ILOAD, 1);
mv.visitJumpInsn(IFEQ, ret);
mv.visitVarInsn(ILOAD, 2);
mv.visitJumpInsn(IFEQ, ret);
mv.visitLabel(body);
mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
mv.visitLabel(ret);
mv.visitInsn(RETURN);
mv.visitLocalVariable("a", "Z", null, start, ret, 0);
mv.visitLocalVariable("b", "Z", null, start, ret, 1);
mv.visitLocalVariable("c", "Z", null, start, ret, 2);
String insn = TestHelper.getAsString(builder.finish(), "test_mth");
String good = "if (a && b && c) {\n"
+ " org.spongepowered.test.decompile.IfTests.body();\n"
+ "}";
Assert.assertEquals(good, insn);
}
Example 16
| Source File: WhileTests.java From Despector with MIT License | 5 votes |
|
@Test
public void testWhileDirectBreak() {
// if the break is the only thing in a condition it will sometimes be
// optimized so that the inverse of the condition targets the outside of
// the loop rather than having a goto inside the condition
TestMethodBuilder builder = new TestMethodBuilder("test_mth", "(IZ)V");
MethodVisitor mv = builder.getGenerator();
Label start = new Label();
mv.visitLabel(start);
Label end = new Label();
Label l1 = new Label();
mv.visitLabel(l1);
mv.visitVarInsn(ILOAD, 0);
mv.visitInsn(ICONST_5);
mv.visitJumpInsn(IF_ICMPGE, end);
mv.visitMethodInsn(INVOKESTATIC, THIS_TYPE.getInternalName(), "body", "()V", false);
mv.visitVarInsn(ILOAD, 1);
mv.visitJumpInsn(IFNE, end);
mv.visitJumpInsn(GOTO, l1);
mv.visitLabel(end);
mv.visitInsn(RETURN);
mv.visitLocalVariable("i", "I", null, start, end, 0);
mv.visitLocalVariable("a", "Z", null, start, end, 1);
String insn = TestHelper.getAsString(builder.finish(), "test_mth");
String good = "while (i < 5) {\n"
+ " org.spongepowered.test.decompile.WhileTests.body();\n"
+ " if (a) {\n"
+ " break;\n"
+ " }\n"
+ "}";
Assert.assertEquals(good, insn);
}
Example 17
| Source File: CompareExpression.java From yql-plus with Apache License 2.0 | 4 votes |
|
@Override
public void generate(CodeEmitter code) {
// a bit of a hack; should not need to go to dynamic invocation for this unless one arg is ANY
Label done = new Label();
MethodVisitor mv = code.getMethodVisitor();
Label leftNull = new Label();
Label rightNull = new Label();
Label bothNull = new Label();
CodeEmitter.Unification unified = code.unifiedEmit(leftExpr, rightExpr, leftNull, rightNull, bothNull);
if (unified.type.isPrimitive()) {
emitPrimitiveCompare(code, unified.type);
} else {
// TODO: statically determine if the unified type is Comparable -- for now treat them all like "any"
CodeEmitter scope = code.createScope();
MethodVisitor mv2 = scope.getMethodVisitor();
AssignableValue right = scope.allocate(unified.type);
AssignableValue left = scope.allocate(unified.type);
scope.exec(right.write(unified.type));
scope.exec(left.write(unified.type));
scope.exec(left.read());
Label leftIsNotComparable = new Label();
scope.emitInstanceCheck(unified.type, Comparable.class, leftIsNotComparable);
scope.exec(right.read());
mv2.visitMethodInsn(Opcodes.INVOKEINTERFACE, Type.getInternalName(Comparable.class), "compareTo",
Type.getMethodDescriptor(Type.INT_TYPE, Type.getType(Object.class)), true);
scope.gotoExitScope();
mv2.visitLabel(leftIsNotComparable);
scope.exec(scope.getLocal("$program").read());
scope.exec(left.read());
scope.emitIntConstant((loc != null) ? loc.getLineNumber() : -1);
scope.emitIntConstant((loc != null) ? loc.getCharacterOffset() : 0);
mv2.visitMethodInsn(Opcodes.INVOKEVIRTUAL, Type.getInternalName(ProgramInvocation.class), "notComparable", Type.getMethodDescriptor(Type.VOID_TYPE, Type.getType(Object.class), Type.INT_TYPE, Type.INT_TYPE), false);
// this bit is not reachable, notComparable throws
mv2.visitInsn(Opcodes.ICONST_0);
mv2.visitJumpInsn(Opcodes.GOTO, done);
scope.endScope();
}
if (unified.nullPossible) {
mv.visitJumpInsn(Opcodes.GOTO, done);
mv.visitLabel(leftNull);
mv.visitInsn(Opcodes.ICONST_M1);
mv.visitJumpInsn(Opcodes.GOTO, done);
mv.visitLabel(rightNull);
mv.visitInsn(Opcodes.ICONST_1);
mv.visitJumpInsn(Opcodes.GOTO, done);
mv.visitLabel(bothNull);
mv.visitInsn(Opcodes.ICONST_0);
}
mv.visitLabel(done);
}
Example 18
| Source File: BooleanExpressionTransformer.java From groovy with Apache License 2.0 | 4 votes |
|
@Override
public void visit(final GroovyCodeVisitor visitor) {
if (visitor instanceof AsmClassGenerator) {
AsmClassGenerator acg = (AsmClassGenerator) visitor;
WriterController controller = acg.getController();
OperandStack os = controller.getOperandStack();
if (type.equals(ClassHelper.boolean_TYPE)) {
expression.visit(visitor);
os.doGroovyCast(ClassHelper.boolean_TYPE);
return;
}
if (type.equals(ClassHelper.Boolean_TYPE)) {
MethodVisitor mv = controller.getMethodVisitor();
expression.visit(visitor);
Label unbox = new Label();
Label exit = new Label();
// check for null
mv.visitInsn(DUP);
mv.visitJumpInsn(IFNONNULL, unbox);
mv.visitInsn(POP);
mv.visitInsn(ICONST_0);
mv.visitJumpInsn(GOTO, exit);
mv.visitLabel(unbox);
// unbox
// GROOVY-6270
if (!os.getTopOperand().equals(type)) BytecodeHelper.doCast(mv, type);
mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/Boolean", "booleanValue", "()Z", false);
mv.visitLabel(exit);
os.replace(ClassHelper.boolean_TYPE);
return;
}
ClassNode top = type;
if (ClassHelper.isPrimitiveType(top)) {
expression.visit(visitor);
// in case of null safe invocation, it is possible that what was supposed to be a primitive type
// becomes the "null" constant, so we need to recheck
top = controller.getOperandStack().getTopOperand();
if (ClassHelper.isPrimitiveType(top)) {
BytecodeHelper.convertPrimitiveToBoolean(controller.getMethodVisitor(), top);
controller.getOperandStack().replace(ClassHelper.boolean_TYPE);
return;
}
}
List<MethodNode> asBoolean = findDGMMethodsByNameAndArguments(controller.getSourceUnit().getClassLoader(), top, "asBoolean", ClassNode.EMPTY_ARRAY);
if (asBoolean.size() == 1) {
MethodNode node = asBoolean.get(0);
if (node instanceof ExtensionMethodNode) {
MethodNode dgmNode = ((ExtensionMethodNode) node).getExtensionMethodNode();
ClassNode owner = dgmNode.getParameters()[0].getType();
if (ClassHelper.OBJECT_TYPE.equals(owner)) {
// we may inline a var!=null check instead of calling a helper method iff
// (1) the class doesn't define an asBoolean method (already tested)
// (2) no subclass defines an asBoolean method
// For (2), we check that we are in one of those cases
// (a) a final class
// (b) a private inner class without subclass
if (Modifier.isFinal(top.getModifiers())
|| (top instanceof InnerClassNode
&& Modifier.isPrivate(top.getModifiers())
&& !isExtended(top, top.getOuterClass().getInnerClasses()))
) {
CompareToNullExpression expr = new CompareToNullExpression(
expression, false
);
expr.visit(acg);
return;
}
}
}
}
super.visit(visitor);
} else {
super.visit(visitor);
}
}
Example 19
| Source File: PlatformProviderGenerator.java From flogger with Apache License 2.0 | 4 votes |
|
private static void tryBlockForPlatform(MethodVisitor methodVisitor, String platformType) {
methodVisitor.visitCode();
// Generate the enveloping try/catch block:
//
// try {
// ...
// } catch (NoClassDefFoundError | IllegalAccessException | InstantiationException
// | InvocationTargetException | NoSuchMethodException e) {
// ...
// }
//
// Note that the exception types need to be listed explicitly (rather than using
// java.lang.ReflectiveOperationException) because that parent exception type isn't available
// on Android until API level 19.
Label startLabel = new Label();
Label endLabel = new Label();
Label handlerLabel = new Label();
methodVisitor.visitTryCatchBlock(
startLabel, endLabel, handlerLabel, "java/lang/NoClassDefFoundError");
methodVisitor.visitTryCatchBlock(
startLabel, endLabel, handlerLabel, "java/lang/IllegalAccessException");
methodVisitor.visitTryCatchBlock(
startLabel, endLabel, handlerLabel, "java/lang/InstantiationException");
methodVisitor.visitTryCatchBlock(
startLabel, endLabel, handlerLabel, "java/lang/reflect/InvocationTargetException");
methodVisitor.visitTryCatchBlock(
startLabel, endLabel, handlerLabel, "java/lang/NoSuchMethodException");
methodVisitor.visitLabel(startLabel);
// Generate the actual reflective constructor call inside the try block:
//
// return (Platform) PlatformClass.class.getDeclaredConstructor().newInstance();
//
// Note that the constructor call happens reflectively to make sure that the platform class
// isn't loaded until actually executing this instruction. That is important because an
// earlier class load could happen outside of the try/catch block where we are explicitly
// handling the case of the class not being present.
methodVisitor.visitLdcInsn(Type.getType(platformType));
methodVisitor.visitInsn(ICONST_0);
methodVisitor.visitTypeInsn(ANEWARRAY, "java/lang/Class");
methodVisitor.visitMethodInsn(
INVOKEVIRTUAL,
"java/lang/Class",
"getDeclaredConstructor",
"([Ljava/lang/Class;)Ljava/lang/reflect/Constructor;",
false);
methodVisitor.visitInsn(ICONST_0);
methodVisitor.visitTypeInsn(ANEWARRAY, "java/lang/Object");
methodVisitor.visitMethodInsn(
INVOKEVIRTUAL,
"java/lang/reflect/Constructor",
"newInstance",
"([Ljava/lang/Object;)Ljava/lang/Object;",
false);
methodVisitor.visitTypeInsn(CHECKCAST, "com/google/common/flogger/backend/Platform");
methodVisitor.visitLabel(endLabel);
methodVisitor.visitInsn(ARETURN);
// Generate the catch block of the overall try/catch. The catch block is actually just empty,
// but Java does require the catch handler to have at least a frame in it to declare the
// exception variable that is available within the catch block scope:
// https://docs.oracle.com/javase/specs/jvms/se7/html/jvms-3.html#jvms-3.12
methodVisitor.visitLabel(handlerLabel);
methodVisitor.visitFrame(F_SAME1, 0, null, 1, new Object[] {"java/lang/Throwable"});
methodVisitor.visitVarInsn(ASTORE, 0);
}
Example 20
| Source File: LabelNode.java From JReFrameworker with MIT License | 4 votes |
|
@Override
public void accept(final MethodVisitor methodVisitor) {
methodVisitor.visitLabel(getLabel());
}
