Java Code Examples for org.springframework.expression.spel.CodeFlow#enterCompilationScope()

The following examples show how to use org.springframework.expression.spel.CodeFlow#enterCompilationScope() . You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.

Example 1

Source File: SpelNodeImpl.java From lams with GNU General Public License v2.0

6 votes

/**
 * Ask an argument to generate its bytecode and then follow it up
 * with any boxing/unboxing/checkcasting to ensure it matches the expected parameter descriptor.
 */
protected static void generateCodeForArgument(MethodVisitor mv, CodeFlow cf, SpelNodeImpl argument, String paramDesc) {
	cf.enterCompilationScope();
	argument.generateCode(mv, cf);
	String lastDesc = cf.lastDescriptor();
	boolean primitiveOnStack = CodeFlow.isPrimitive(lastDesc);
	// Check if need to box it for the method reference?
	if (primitiveOnStack && paramDesc.charAt(0) == 'L') {
		CodeFlow.insertBoxIfNecessary(mv, lastDesc.charAt(0));
	}
	else if (paramDesc.length() == 1 && !primitiveOnStack) {
		CodeFlow.insertUnboxInsns(mv, paramDesc.charAt(0), lastDesc);
	}
	else if (!paramDesc.equals(lastDesc)) {
		// This would be unnecessary in the case of subtyping (e.g. method takes Number but Integer passed in)
		CodeFlow.insertCheckCast(mv, paramDesc);
	}
	cf.exitCompilationScope();
}

Example 2

Source File: OpPlus.java From lams with GNU General Public License v2.0

6 votes

/**
 * Walk through a possible tree of nodes that combine strings and append
 * them all to the same (on stack) StringBuilder.
 */
private void walk(MethodVisitor mv, CodeFlow cf, SpelNodeImpl operand) {
	if (operand instanceof OpPlus) {
		OpPlus plus = (OpPlus)operand;
		walk(mv, cf, plus.getLeftOperand());
		walk(mv, cf, plus.getRightOperand());
	}
	else {
		cf.enterCompilationScope();
		operand.generateCode(mv,cf);
		if (!"Ljava/lang/String".equals(cf.lastDescriptor())) {
			mv.visitTypeInsn(CHECKCAST, "java/lang/String");
		}
		cf.exitCompilationScope();
		mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "append", "(Ljava/lang/String;)Ljava/lang/StringBuilder;", false);
	}
}

Example 3

Source File: OpAnd.java From spring-analysis-note with MIT License

6 votes

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	// Pseudo: if (!leftOperandValue) { result=false; } else { result=rightOperandValue; }
	Label elseTarget = new Label();
	Label endOfIf = new Label();
	cf.enterCompilationScope();
	getLeftOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitJumpInsn(IFNE, elseTarget);
	mv.visitLdcInsn(0); // FALSE
	mv.visitJumpInsn(GOTO,endOfIf);
	mv.visitLabel(elseTarget);
	cf.enterCompilationScope();
	getRightOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitLabel(endOfIf);
	cf.pushDescriptor(this.exitTypeDescriptor);
}

Example 4

Source File: OpAnd.java From java-technology-stack with MIT License

6 votes

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	// Pseudo: if (!leftOperandValue) { result=false; } else { result=rightOperandValue; }
	Label elseTarget = new Label();
	Label endOfIf = new Label();
	cf.enterCompilationScope();
	getLeftOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitJumpInsn(IFNE, elseTarget);
	mv.visitLdcInsn(0); // FALSE
	mv.visitJumpInsn(GOTO,endOfIf);
	mv.visitLabel(elseTarget);
	cf.enterCompilationScope();
	getRightOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitLabel(endOfIf);
	cf.pushDescriptor(this.exitTypeDescriptor);
}

Example 5

Source File: OpAnd.java From lams with GNU General Public License v2.0

6 votes

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	// Pseudo: if (!leftOperandValue) { result=false; } else { result=rightOperandValue; }
	Label elseTarget = new Label();
	Label endOfIf = new Label();
	cf.enterCompilationScope();
	getLeftOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitJumpInsn(IFNE, elseTarget);
	mv.visitLdcInsn(0); // FALSE
	mv.visitJumpInsn(GOTO,endOfIf);
	mv.visitLabel(elseTarget);
	cf.enterCompilationScope();
	getRightOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitLabel(endOfIf);
	cf.pushDescriptor(this.exitTypeDescriptor);
}

Example 6

Source File: SpelNodeImpl.java From spring-analysis-note with MIT License

6 votes

/**
 * Ask an argument to generate its bytecode and then follow it up
 * with any boxing/unboxing/checkcasting to ensure it matches the expected parameter descriptor.
 */
protected static void generateCodeForArgument(MethodVisitor mv, CodeFlow cf, SpelNodeImpl argument, String paramDesc) {
	cf.enterCompilationScope();
	argument.generateCode(mv, cf);
	String lastDesc = cf.lastDescriptor();
	Assert.state(lastDesc != null, "No last descriptor");
	boolean primitiveOnStack = CodeFlow.isPrimitive(lastDesc);
	// Check if need to box it for the method reference?
	if (primitiveOnStack && paramDesc.charAt(0) == 'L') {
		CodeFlow.insertBoxIfNecessary(mv, lastDesc.charAt(0));
	}
	else if (paramDesc.length() == 1 && !primitiveOnStack) {
		CodeFlow.insertUnboxInsns(mv, paramDesc.charAt(0), lastDesc);
	}
	else if (!paramDesc.equals(lastDesc)) {
		// This would be unnecessary in the case of subtyping (e.g. method takes Number but Integer passed in)
		CodeFlow.insertCheckCast(mv, paramDesc);
	}
	cf.exitCompilationScope();
}

Example 7

Source File: OpAnd.java From spring4-understanding with Apache License 2.0

6 votes

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	// Pseudo: if (!leftOperandValue) { result=false; } else { result=rightOperandValue; }
	Label elseTarget = new Label();
	Label endOfIf = new Label();
	cf.enterCompilationScope();
	getLeftOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitJumpInsn(IFNE, elseTarget);
	mv.visitLdcInsn(0); // FALSE
	mv.visitJumpInsn(GOTO,endOfIf);
	mv.visitLabel(elseTarget);
	cf.enterCompilationScope();
	getRightOperand().generateCode(mv, cf);
	cf.unboxBooleanIfNecessary(mv);
	cf.exitCompilationScope();
	mv.visitLabel(endOfIf);
	cf.pushDescriptor(this.exitTypeDescriptor);
}

Example 8

Source File: OpModulus.java From java-technology-stack with MIT License

5 votes

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	getLeftOperand().generateCode(mv, cf);
	String leftDesc = getLeftOperand().exitTypeDescriptor;
	String exitDesc = this.exitTypeDescriptor;
	Assert.state(exitDesc != null, "No exit type descriptor");
	char targetDesc = exitDesc.charAt(0);
	CodeFlow.insertNumericUnboxOrPrimitiveTypeCoercion(mv, leftDesc, targetDesc);
	if (this.children.length > 1) {
		cf.enterCompilationScope();
		getRightOperand().generateCode(mv, cf);
		String rightDesc = getRightOperand().exitTypeDescriptor;
		cf.exitCompilationScope();
		CodeFlow.insertNumericUnboxOrPrimitiveTypeCoercion(mv, rightDesc, targetDesc);
		switch (targetDesc) {
			case 'I':
				mv.visitInsn(IREM);
				break;
			case 'J':
				mv.visitInsn(LREM);
				break;
			case 'F':
				mv.visitInsn(FREM);
				break;
			case 'D':
				mv.visitInsn(DREM);
				break;
			default:
				throw new IllegalStateException(
						"Unrecognized exit type descriptor: '" + this.exitTypeDescriptor + "'");
		}
	}
	cf.pushDescriptor(this.exitTypeDescriptor);
}

Example 9

Source File: OpDivide.java From java-technology-stack with MIT License

5 votes

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	getLeftOperand().generateCode(mv, cf);
	String leftDesc = getLeftOperand().exitTypeDescriptor;
	String exitDesc = this.exitTypeDescriptor;
	Assert.state(exitDesc != null, "No exit type descriptor");
	char targetDesc = exitDesc.charAt(0);
	CodeFlow.insertNumericUnboxOrPrimitiveTypeCoercion(mv, leftDesc, targetDesc);
	if (this.children.length > 1) {
		cf.enterCompilationScope();
		getRightOperand().generateCode(mv, cf);
		String rightDesc = getRightOperand().exitTypeDescriptor;
		cf.exitCompilationScope();
		CodeFlow.insertNumericUnboxOrPrimitiveTypeCoercion(mv, rightDesc, targetDesc);
		switch (targetDesc) {
			case 'I':
				mv.visitInsn(IDIV);
				break;
			case 'J':
				mv.visitInsn(LDIV);
				break;
			case 'F':
				mv.visitInsn(FDIV);
				break;
			case 'D':
				mv.visitInsn(DDIV);
				break;
			default:
				throw new IllegalStateException(
						"Unrecognized exit type descriptor: '" + this.exitTypeDescriptor + "'");
		}
	}
	cf.pushDescriptor(this.exitTypeDescriptor);
}

Example 10

Source File: Elvis.java From java-technology-stack with MIT License

5 votes

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	// exit type descriptor can be null if both components are literal expressions
	computeExitTypeDescriptor();
	cf.enterCompilationScope();
	this.children[0].generateCode(mv, cf);
	String lastDesc = cf.lastDescriptor();
	Assert.state(lastDesc != null, "No last descriptor");
	CodeFlow.insertBoxIfNecessary(mv, lastDesc.charAt(0));
	cf.exitCompilationScope();
	Label elseTarget = new Label();
	Label endOfIf = new Label();
	mv.visitInsn(DUP);
	mv.visitJumpInsn(IFNULL, elseTarget);
	// Also check if empty string, as per the code in the interpreted version
	mv.visitInsn(DUP);
	mv.visitLdcInsn("");
	mv.visitInsn(SWAP);
	mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "equals", "(Ljava/lang/Object;)Z",false);
	mv.visitJumpInsn(IFEQ, endOfIf);  // if not empty, drop through to elseTarget
	mv.visitLabel(elseTarget);
	mv.visitInsn(POP);
	cf.enterCompilationScope();
	this.children[1].generateCode(mv, cf);
	if (!CodeFlow.isPrimitive(this.exitTypeDescriptor)) {
		lastDesc = cf.lastDescriptor();
		Assert.state(lastDesc != null, "No last descriptor");
		CodeFlow.insertBoxIfNecessary(mv, lastDesc.charAt(0));
	}
	cf.exitCompilationScope();
	mv.visitLabel(endOfIf);
	cf.pushDescriptor(this.exitTypeDescriptor);
}

Example 11

Source File: Ternary.java From java-technology-stack with MIT License

5 votes

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	// May reach here without it computed if all elements are literals
	computeExitTypeDescriptor();
	cf.enterCompilationScope();
	this.children[0].generateCode(mv, cf);
	String lastDesc = cf.lastDescriptor();
	Assert.state(lastDesc != null, "No last descriptor");
	if (!CodeFlow.isPrimitive(lastDesc)) {
		CodeFlow.insertUnboxInsns(mv, 'Z', lastDesc);
	}
	cf.exitCompilationScope();
	Label elseTarget = new Label();
	Label endOfIf = new Label();
	mv.visitJumpInsn(IFEQ, elseTarget);
	cf.enterCompilationScope();
	this.children[1].generateCode(mv, cf);
	if (!CodeFlow.isPrimitive(this.exitTypeDescriptor)) {
		lastDesc = cf.lastDescriptor();
		Assert.state(lastDesc != null, "No last descriptor");
		CodeFlow.insertBoxIfNecessary(mv, lastDesc.charAt(0));
	}
	cf.exitCompilationScope();
	mv.visitJumpInsn(GOTO, endOfIf);
	mv.visitLabel(elseTarget);
	cf.enterCompilationScope();
	this.children[2].generateCode(mv, cf);
	if (!CodeFlow.isPrimitive(this.exitTypeDescriptor)) {
		lastDesc = cf.lastDescriptor();
		Assert.state(lastDesc != null, "No last descriptor");
		CodeFlow.insertBoxIfNecessary(mv, lastDesc.charAt(0));
	}
	cf.exitCompilationScope();
	mv.visitLabel(endOfIf);
	cf.pushDescriptor(this.exitTypeDescriptor);
}

Example 12

Source File: OpMultiply.java From spring-analysis-note with MIT License

5 votes

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	getLeftOperand().generateCode(mv, cf);
	String leftDesc = getLeftOperand().exitTypeDescriptor;
	String exitDesc = this.exitTypeDescriptor;
	Assert.state(exitDesc != null, "No exit type descriptor");
	char targetDesc = exitDesc.charAt(0);
	CodeFlow.insertNumericUnboxOrPrimitiveTypeCoercion(mv, leftDesc, targetDesc);
	if (this.children.length > 1) {
		cf.enterCompilationScope();
		getRightOperand().generateCode(mv, cf);
		String rightDesc = getRightOperand().exitTypeDescriptor;
		cf.exitCompilationScope();
		CodeFlow.insertNumericUnboxOrPrimitiveTypeCoercion(mv, rightDesc, targetDesc);
		switch (targetDesc) {
			case 'I':
				mv.visitInsn(IMUL);
				break;
			case 'J':
				mv.visitInsn(LMUL);
				break;
			case 'F':
				mv.visitInsn(FMUL);
				break;
			case 'D':
				mv.visitInsn(DMUL);
				break;
			default:
				throw new IllegalStateException(
						"Unrecognized exit type descriptor: '" + this.exitTypeDescriptor + "'");
		}
	}
	cf.pushDescriptor(this.exitTypeDescriptor);
}

Example 13

Source File: OpEQ.java From spring-analysis-note with MIT License

5 votes

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	cf.loadEvaluationContext(mv);
	String leftDesc = getLeftOperand().exitTypeDescriptor;
	String rightDesc = getRightOperand().exitTypeDescriptor;
	boolean leftPrim = CodeFlow.isPrimitive(leftDesc);
	boolean rightPrim = CodeFlow.isPrimitive(rightDesc);

	cf.enterCompilationScope();
	getLeftOperand().generateCode(mv, cf);
	cf.exitCompilationScope();
	if (leftPrim) {
		CodeFlow.insertBoxIfNecessary(mv, leftDesc.charAt(0));
	}
	cf.enterCompilationScope();
	getRightOperand().generateCode(mv, cf);
	cf.exitCompilationScope();
	if (rightPrim) {
		CodeFlow.insertBoxIfNecessary(mv, rightDesc.charAt(0));
	}

	String operatorClassName = Operator.class.getName().replace('.', '/');
	String evaluationContextClassName = EvaluationContext.class.getName().replace('.', '/');
	mv.visitMethodInsn(INVOKESTATIC, operatorClassName, "equalityCheck",
			"(L" + evaluationContextClassName + ";Ljava/lang/Object;Ljava/lang/Object;)Z", false);
	cf.pushDescriptor("Z");
}

Example 14

Source File: OpNE.java From java-technology-stack with MIT License

5 votes

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	cf.loadEvaluationContext(mv);
	String leftDesc = getLeftOperand().exitTypeDescriptor;
	String rightDesc = getRightOperand().exitTypeDescriptor;
	boolean leftPrim = CodeFlow.isPrimitive(leftDesc);
	boolean rightPrim = CodeFlow.isPrimitive(rightDesc);

	cf.enterCompilationScope();
	getLeftOperand().generateCode(mv, cf);
	cf.exitCompilationScope();
	if (leftPrim) {
		CodeFlow.insertBoxIfNecessary(mv, leftDesc.charAt(0));
	}
	cf.enterCompilationScope();
	getRightOperand().generateCode(mv, cf);
	cf.exitCompilationScope();
	if (rightPrim) {
		CodeFlow.insertBoxIfNecessary(mv, rightDesc.charAt(0));
	}

	String operatorClassName = Operator.class.getName().replace('.', '/');
	String evaluationContextClassName = EvaluationContext.class.getName().replace('.', '/');
	mv.visitMethodInsn(INVOKESTATIC, operatorClassName, "equalityCheck",
			"(L" + evaluationContextClassName + ";Ljava/lang/Object;Ljava/lang/Object;)Z", false);

	// Invert the boolean
	Label notZero = new Label();
	Label end = new Label();
	mv.visitJumpInsn(IFNE, notZero);
	mv.visitInsn(ICONST_1);
	mv.visitJumpInsn(GOTO, end);
	mv.visitLabel(notZero);
	mv.visitInsn(ICONST_0);
	mv.visitLabel(end);

	cf.pushDescriptor("Z");
}

Example 15

Source File: OpEQ.java From lams with GNU General Public License v2.0

5 votes

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	cf.loadEvaluationContext(mv);
	String leftDesc = getLeftOperand().exitTypeDescriptor;
	String rightDesc = getRightOperand().exitTypeDescriptor;
	boolean leftPrim = CodeFlow.isPrimitive(leftDesc);
	boolean rightPrim = CodeFlow.isPrimitive(rightDesc);

	cf.enterCompilationScope();
	getLeftOperand().generateCode(mv, cf);
	cf.exitCompilationScope();
	if (leftPrim) {
		CodeFlow.insertBoxIfNecessary(mv, leftDesc.charAt(0));
	}
	cf.enterCompilationScope();
	getRightOperand().generateCode(mv, cf);
	cf.exitCompilationScope();
	if (rightPrim) {
		CodeFlow.insertBoxIfNecessary(mv, rightDesc.charAt(0));
	}

	String operatorClassName = Operator.class.getName().replace('.', '/');
	String evaluationContextClassName = EvaluationContext.class.getName().replace('.', '/');
	mv.visitMethodInsn(INVOKESTATIC, operatorClassName, "equalityCheck",
			"(L" + evaluationContextClassName + ";Ljava/lang/Object;Ljava/lang/Object;)Z", false);
	cf.pushDescriptor("Z");
}

Example 16

Source File: OpEQ.java From java-technology-stack with MIT License

5 votes

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	cf.loadEvaluationContext(mv);
	String leftDesc = getLeftOperand().exitTypeDescriptor;
	String rightDesc = getRightOperand().exitTypeDescriptor;
	boolean leftPrim = CodeFlow.isPrimitive(leftDesc);
	boolean rightPrim = CodeFlow.isPrimitive(rightDesc);

	cf.enterCompilationScope();
	getLeftOperand().generateCode(mv, cf);
	cf.exitCompilationScope();
	if (leftPrim) {
		CodeFlow.insertBoxIfNecessary(mv, leftDesc.charAt(0));
	}
	cf.enterCompilationScope();
	getRightOperand().generateCode(mv, cf);
	cf.exitCompilationScope();
	if (rightPrim) {
		CodeFlow.insertBoxIfNecessary(mv, rightDesc.charAt(0));
	}

	String operatorClassName = Operator.class.getName().replace('.', '/');
	String evaluationContextClassName = EvaluationContext.class.getName().replace('.', '/');
	mv.visitMethodInsn(INVOKESTATIC, operatorClassName, "equalityCheck",
			"(L" + evaluationContextClassName + ";Ljava/lang/Object;Ljava/lang/Object;)Z", false);
	cf.pushDescriptor("Z");
}

Example 17

Source File: OpPlus.java From java-technology-stack with MIT License

4 votes

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	if ("Ljava/lang/String".equals(this.exitTypeDescriptor)) {
		mv.visitTypeInsn(NEW, "java/lang/StringBuilder");
		mv.visitInsn(DUP);
		mv.visitMethodInsn(INVOKESPECIAL, "java/lang/StringBuilder", "<init>", "()V", false);
		walk(mv, cf, getLeftOperand());
		walk(mv, cf, getRightOperand());
		mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "toString", "()Ljava/lang/String;", false);
	}
	else {
		this.children[0].generateCode(mv, cf);
		String leftDesc = this.children[0].exitTypeDescriptor;
		String exitDesc = this.exitTypeDescriptor;
		Assert.state(exitDesc != null, "No exit type descriptor");
		char targetDesc = exitDesc.charAt(0);
		CodeFlow.insertNumericUnboxOrPrimitiveTypeCoercion(mv, leftDesc, targetDesc);
		if (this.children.length > 1) {
			cf.enterCompilationScope();
			this.children[1].generateCode(mv, cf);
			String rightDesc = this.children[1].exitTypeDescriptor;
			cf.exitCompilationScope();
			CodeFlow.insertNumericUnboxOrPrimitiveTypeCoercion(mv, rightDesc, targetDesc);
			switch (targetDesc) {
				case 'I':
					mv.visitInsn(IADD);
					break;
				case 'J':
					mv.visitInsn(LADD);
					break;
				case 'F':
					mv.visitInsn(FADD);
					break;
				case 'D':
					mv.visitInsn(DADD);
					break;
				default:
					throw new IllegalStateException(
							"Unrecognized exit type descriptor: '" + this.exitTypeDescriptor + "'");
			}
		}
	}
	cf.pushDescriptor(this.exitTypeDescriptor);
}

Example 18

Source File: OpNE.java From spring4-understanding with Apache License 2.0

4 votes

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	String leftDesc = getLeftOperand().exitTypeDescriptor;
	String rightDesc = getRightOperand().exitTypeDescriptor;
	Label elseTarget = new Label();
	Label endOfIf = new Label();
	boolean leftPrim = CodeFlow.isPrimitive(leftDesc);
	boolean rightPrim = CodeFlow.isPrimitive(rightDesc);

	DescriptorComparison dc = DescriptorComparison.checkNumericCompatibility(leftDesc, rightDesc, leftActualDescriptor, rightActualDescriptor);
	
	if (dc.areNumbers && dc.areCompatible) {
		char targetType = dc.compatibleType;
		
		getLeftOperand().generateCode(mv, cf);
		if (!leftPrim) {
			CodeFlow.insertUnboxInsns(mv, targetType, leftDesc);
		}
	
		cf.enterCompilationScope();
		getRightOperand().generateCode(mv, cf);
		cf.exitCompilationScope();
		if (!rightPrim) {
			CodeFlow.insertUnboxInsns(mv, targetType, rightDesc);
		}
		// assert: SpelCompiler.boxingCompatible(leftDesc, rightDesc)
		if (targetType == 'D') {
			mv.visitInsn(DCMPL);
			mv.visitJumpInsn(IFEQ, elseTarget);
		}
		else if (targetType == 'F') {
			mv.visitInsn(FCMPL);		
			mv.visitJumpInsn(IFEQ, elseTarget);
		}
		else if (targetType == 'J') {
			mv.visitInsn(LCMP);		
			mv.visitJumpInsn(IFEQ, elseTarget);
		}
		else if (targetType == 'I' || targetType == 'Z') {
			mv.visitJumpInsn(IF_ICMPEQ, elseTarget);		
		}
		else {
			throw new IllegalStateException("Unexpected descriptor "+leftDesc);
		}
	}
	else {
		getLeftOperand().generateCode(mv, cf);
		getRightOperand().generateCode(mv, cf);
		mv.visitJumpInsn(IF_ACMPEQ, elseTarget);
	}
	mv.visitInsn(ICONST_1);
	mv.visitJumpInsn(GOTO,endOfIf);
	mv.visitLabel(elseTarget);
	mv.visitInsn(ICONST_0);
	mv.visitLabel(endOfIf);
	cf.pushDescriptor("Z");
}

Example 19

Source File: Operator.java From java-technology-stack with MIT License

4 votes

/**
 * Numeric comparison operators share very similar generated code, only differing in
 * two comparison instructions.
 */
protected void generateComparisonCode(MethodVisitor mv, CodeFlow cf, int compInstruction1, int compInstruction2) {
	SpelNodeImpl left = getLeftOperand();
	SpelNodeImpl right = getRightOperand();
	String leftDesc = left.exitTypeDescriptor;
	String rightDesc = right.exitTypeDescriptor;

	boolean unboxLeft = !CodeFlow.isPrimitive(leftDesc);
	boolean unboxRight = !CodeFlow.isPrimitive(rightDesc);
	DescriptorComparison dc = DescriptorComparison.checkNumericCompatibility(
			leftDesc, rightDesc, this.leftActualDescriptor, this.rightActualDescriptor);
	char targetType = dc.compatibleType;  // CodeFlow.toPrimitiveTargetDesc(leftDesc);

	cf.enterCompilationScope();
	left.generateCode(mv, cf);
	cf.exitCompilationScope();
	if (unboxLeft) {
		CodeFlow.insertUnboxInsns(mv, targetType, leftDesc);
	}

	cf.enterCompilationScope();
	right.generateCode(mv, cf);
	cf.exitCompilationScope();
	if (unboxRight) {
		CodeFlow.insertUnboxInsns(mv, targetType, rightDesc);
	}

	// assert: SpelCompiler.boxingCompatible(leftDesc, rightDesc)
	Label elseTarget = new Label();
	Label endOfIf = new Label();
	if (targetType == 'D') {
		mv.visitInsn(DCMPG);
		mv.visitJumpInsn(compInstruction1, elseTarget);
	}
	else if (targetType == 'F') {
		mv.visitInsn(FCMPG);
		mv.visitJumpInsn(compInstruction1, elseTarget);
	}
	else if (targetType == 'J') {
		mv.visitInsn(LCMP);
		mv.visitJumpInsn(compInstruction1, elseTarget);
	}
	else if (targetType == 'I') {
		mv.visitJumpInsn(compInstruction2, elseTarget);
	}
	else {
		throw new IllegalStateException("Unexpected descriptor " + leftDesc);
	}

	// Other numbers are not yet supported (isCompilable will not have returned true)
	mv.visitInsn(ICONST_1);
	mv.visitJumpInsn(GOTO,endOfIf);
	mv.visitLabel(elseTarget);
	mv.visitInsn(ICONST_0);
	mv.visitLabel(endOfIf);
	cf.pushDescriptor("Z");
}

Example 20

Source File: OpPlus.java From spring4-understanding with Apache License 2.0

4 votes

@Override
public void generateCode(MethodVisitor mv, CodeFlow cf) {
	if (this.exitTypeDescriptor == "Ljava/lang/String") {
		mv.visitTypeInsn(NEW, "java/lang/StringBuilder");
		mv.visitInsn(DUP);
		mv.visitMethodInsn(INVOKESPECIAL, "java/lang/StringBuilder", "<init>", "()V", false);
		walk(mv,cf,getLeftOperand());
		walk(mv,cf,getRightOperand());
		mv.visitMethodInsn(INVOKEVIRTUAL, "java/lang/StringBuilder", "toString", "()Ljava/lang/String;", false);
	}
	else {
		getLeftOperand().generateCode(mv, cf);
		String leftDesc = getLeftOperand().exitTypeDescriptor;
		CodeFlow.insertNumericUnboxOrPrimitiveTypeCoercion(mv, leftDesc, this.exitTypeDescriptor.charAt(0));
		if (this.children.length > 1) {
			cf.enterCompilationScope();
			getRightOperand().generateCode(mv, cf);
			String rightDesc = getRightOperand().exitTypeDescriptor;
			cf.exitCompilationScope();
			CodeFlow.insertNumericUnboxOrPrimitiveTypeCoercion(mv, rightDesc, this.exitTypeDescriptor.charAt(0));
			switch (this.exitTypeDescriptor.charAt(0)) {
				case 'I':
					mv.visitInsn(IADD);
					break;
				case 'J':
					mv.visitInsn(LADD);
					break;
				case 'F': 
					mv.visitInsn(FADD);
					break;
				case 'D':
					mv.visitInsn(DADD);
					break;				
				default:
					throw new IllegalStateException(
							"Unrecognized exit type descriptor: '" + this.exitTypeDescriptor + "'");
			}
		}
	}
	cf.pushDescriptor(this.exitTypeDescriptor);
}