https://issues.apache.org/bugzilla/show_bug.cgi?id=56955
Bug ID: 56955
Summary: Skip some useless information in the class when
parsing
Product: Tomcat 7
Version: trunk
Hardware: PC
Status: NEW
Severity: enhancement
Priority: P2
Component: Catalina
Assignee: dev@tomcat.apache.org
Reporter: hzha...@ebay.com
Depends on: 56953
Created attachment 31996
--> https://issues.apache.org/bugzilla/attachment.cgi?id=31996&action=edit
patch
“org.apache.tomcat.util.bcel.classfile.ClassParser” parse ".class" file to an
Object.
Actually, many information in the ".class" is useless. Including: version,
fields, methods.
Skip these information can speed up the startup of tomcat. Add a switch named
"isSkip", and modify the parse as following.
/****************** Read headers ********************************/
// Check magic tag of class file
readID();
// Get compiler version
if(!isSkip) readVersion();
else skipVersion();
/****************** Read constant pool and related **************/
// Read constant pool entries
readConstantPool();
// Get class information
readClassInfo();
// Get interface information, i.e., implemented interfaces
readInterfaces();
/****************** Read class fields and methods ***************/
// Read class fields, i.e., the variables of the class
if(!isSkip) readFields();
else skipFields();
// Read class methods, i.e., the functions in the class
if(!isSkip) readMethods();
else skipMethods();
// Read class attributes
readAttributes();
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