本文整理汇总了Java中org.apache.bcel.generic.InstructionHandle.getPrev方法的典型用法代码示例。如果您正苦于以下问题：Java InstructionHandle.getPrev方法的具体用法？Java InstructionHandle.getPrev怎么用？Java InstructionHandle.getPrev使用的例子？那么, 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.apache.bcel.generic.InstructionHandle的用法示例。
在下文中一共展示了InstructionHandle.getPrev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: getPredecessorOf
import org.apache.bcel.generic.InstructionHandle; //导入方法依赖的package包/类
/**
* Get the predecessor of given instruction within the basic block.
* @param handle the instruction
* @return the instruction's predecessor, or null if the instruction
* is the first in the basic block
*/
public InstructionHandle getPredecessorOf(InstructionHandle handle) {
if (VERIFY_INTEGRITY) {
if (!containsInstruction(handle))
throw new IllegalStateException();
}
return handle == firstInstruction
? null
: handle.getPrev();
}
示例2: sawOpcode
import org.apache.bcel.generic.InstructionHandle; //导入方法依赖的package包/类
@Override
public void sawOpcode(int seen) {
if (seen != Constants.INVOKEVIRTUAL) {
return;
}
String fullClassName = getClassConstantOperand();
String method = getNameConstantOperand();
//The method call is doing XML parsing (see class javadoc)
if (fullClassName.equals("javax/xml/stream/XMLInputFactory") &&
method.equals("createXMLStreamReader")) {
ClassContext classCtx = getClassContext();
ConstantPoolGen cpg = classCtx.getConstantPoolGen();
CFG cfg;
try {
cfg = classCtx.getCFG(getMethod());
} catch (CFGBuilderException e) {
AnalysisContext.logError("Cannot get CFG", e);
return;
}
for (Iterator<Location> i = cfg.locationIterator(); i.hasNext();) {
Location location = i.next();
Instruction inst = location.getHandle().getInstruction();
//DTD disallow
//XMLInputFactory.setProperty
if (inst instanceof org.apache.bcel.generic.INVOKEVIRTUAL) {
InvokeInstruction invoke = (InvokeInstruction) inst;
if ("setProperty".equals(invoke.getMethodName(cpg))) {
org.apache.bcel.generic.LDC loadConst = ByteCode.getPrevInstruction(location.getHandle(), LDC.class);
if (loadConst != null) {
if (PROPERTY_SUPPORT_DTD.equals(loadConst.getValue(cpg)) || PROPERTY_IS_SUPPORTING_EXTERNAL_ENTITIES.equals(loadConst.getValue(cpg))){
InstructionHandle prev1 = location.getHandle().getPrev();
InstructionHandle prev2 = prev1.getPrev();
//Case where the boolean is wrapped like : Boolean.valueOf(true) : 2 instructions
if (invokeInstruction().atClass("java.lang.Boolean").atMethod("valueOf").matches(prev1.getInstruction(),cpg)) {
if (prev2.getInstruction() instanceof ICONST) {
Integer valueWrapped = ByteCode.getConstantInt(prev2);
if (valueWrapped != null && valueWrapped.equals(0)) { //Value is false
return; //Safe feature is disable
}
}
}
//Case where the boolean is declared as : Boolean.FALSE
else if (prev1.getInstruction() instanceof org.apache.bcel.generic.GETSTATIC) {
org.apache.bcel.generic.GETSTATIC getstatic = (org.apache.bcel.generic.GETSTATIC) prev1.getInstruction();
if (getstatic.getClassType(cpg).getClassName().equals("java.lang.Boolean") &&
getstatic.getFieldName(cpg).equals("FALSE")) {
return;
}
}
}
}
}
}
}
//Raise a bug
bugReporter.reportBug(new BugInstance(this, XXE_XMLSTREAMREADER_TYPE, Priorities.NORMAL_PRIORITY) //
.addClass(this).addMethod(this).addSourceLine(this));
}
}