本文整理汇总了Java中org.springframework.asm.MethodVisitor.visitCode方法的典型用法代码示例。如果您正苦于以下问题：Java MethodVisitor.visitCode方法的具体用法？Java MethodVisitor.visitCode怎么用？Java MethodVisitor.visitCode使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类org.springframework.asm.MethodVisitor的用法示例。
在下文中一共展示了MethodVisitor.visitCode方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Java代码示例。
示例1: finish
import org.springframework.asm.MethodVisitor; //导入方法依赖的package包/类
/**
* Called after the main expression evaluation method has been generated, this
* method will callback any registered FieldAdders or ClinitAdders to add any
* extra information to the class representing the compiled expression.
*/
public void finish() {
if (fieldAdders != null) {
for (FieldAdder fieldAdder: fieldAdders) {
fieldAdder.generateField(cw,this);
}
}
if (clinitAdders != null) {
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC | ACC_STATIC, "<clinit>", "()V", null, null);
mv.visitCode();
nextFreeVariableId = 0; // To 0 because there is no 'this' in a clinit
for (ClinitAdder clinitAdder: clinitAdders) {
clinitAdder.generateCode(mv, this);
}
mv.visitInsn(RETURN);
mv.visitMaxs(0,0); // not supplied due to COMPUTE_MAXS
mv.visitEnd();
}
}
示例2: createExpressionClass
import org.springframework.asm.MethodVisitor; //导入方法依赖的package包/类
/**
* Generate the class that encapsulates the compiled expression and define it.
* The generated class will be a subtype of CompiledExpression.
* @param expressionToCompile the expression to be compiled
* @return the expression call, or {@code null} if the decision was to opt out of
* compilation during code generation
*/
@SuppressWarnings("unchecked")
private Class<? extends CompiledExpression> createExpressionClass(SpelNodeImpl expressionToCompile) {
// Create class outline 'spel/ExNNN extends org.springframework.expression.spel.CompiledExpression'
String clazzName = "spel/Ex" + getNextSuffix();
ClassWriter cw = new ExpressionClassWriter();
cw.visit(V1_5, ACC_PUBLIC, clazzName, null, "org/springframework/expression/spel/CompiledExpression", null);
// Create default constructor
MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
mv.visitCode();
mv.visitVarInsn(ALOAD, 0);
mv.visitMethodInsn(INVOKESPECIAL, "org/springframework/expression/spel/CompiledExpression",
"<init>", "()V", false);
mv.visitInsn(RETURN);
mv.visitMaxs(1, 1);
mv.visitEnd();
// Create getValue() method
mv = cw.visitMethod(ACC_PUBLIC, "getValue",
"(Ljava/lang/Object;Lorg/springframework/expression/EvaluationContext;)Ljava/lang/Object;", null,
new String[ ]{"org/springframework/expression/EvaluationException"});
mv.visitCode();
CodeFlow cf = new CodeFlow(clazzName, cw);
// Ask the expression AST to generate the body of the method
try {
expressionToCompile.generateCode(mv, cf);
}
catch (IllegalStateException ex) {
if (logger.isDebugEnabled()) {
logger.debug(expressionToCompile.getClass().getSimpleName() +
".generateCode opted out of compilation: " + ex.getMessage());
}
return null;
}
CodeFlow.insertBoxIfNecessary(mv, cf.lastDescriptor());
if ("V".equals(cf.lastDescriptor())) {
mv.visitInsn(ACONST_NULL);
}
mv.visitInsn(ARETURN);
mv.visitMaxs(0, 0); // not supplied due to COMPUTE_MAXS
mv.visitEnd();
cw.visitEnd();
cf.finish();
byte[] data = cw.toByteArray();
// TODO need to make this conditionally occur based on a debug flag
// dump(expressionToCompile.toStringAST(), clazzName, data);
return (Class<? extends CompiledExpression>) this.ccl.defineClass(clazzName.replaceAll("/", "."), data);
}