JarCastingJava bytecode to JSON representation
bc2json could convert *.class bytecode to json representation so that we can use it as a human readable and also the world's most popular IR(ok, that's json) for further use. Parsing behaviors are based on jvm8 specification. All elements on specification would be parsed into json.
Quick start
Step 0: Recommend to introduce bc2json and its dependencies by maven
<dependency>
<groupId>com.github.racaljk</groupId>
<artifactId>bc2json</artifactId>
<version>1.4.1/version>
</dependency>
Step 1: You can load bytecode from local file
B2Json b2Json = B2Json.fromFilePath("/path/to/Test.class");
Optional step 2: and then set some options
b2Json.withOption(Option.PRETTY_PRINTING);
b2Json.withOption(Option.MORE_READABLE);
Step 3: Got it
String result = b2Json.toJsonString();
System.out.println(result);
// Or persist the result string to disk
b2Json.toJsonFile("test.json");
Demonstrations of options
You can set these options according to your demands
Without any options
{"magic":-889275714,"minor_version":0,"major_version":52,"constants":{"slotsNum":"37","slots":[
{"index":1,"type":"parser.classfile.constantpool.ConstantMethodRefInfo","method_class":"java/lang/Object",
"method_name":"\u003cinit\u003e","method_type":"()V"},...]},"access_flag":33,"this_class":"Test",
"super_class":"java/lang/Object","interfaces":[],"fields":[{"field_name":"greeting","field_type":
"Ljava/lang/String;","access_flag":"26"}],"methods":[{"method_name":"\u003cinit\u003e","method_type"
:"()V","method_flag":"1","method_opcode":"42,183,0,1,177"},...],"classfile_attributes":[{"attribute_name":
"SourceFileAttribute","source_file":"Test.java"},...]}
Option.PRETTY_PRINTING
{
"magic": -889275714,
"minor_version": 0,
"major_version": 52,
"constants": {
"slotsNum": "37",
"slots": [
{
"index": 1,
"type": "parser.classfile.constantpool.ConstantMethodRefInfo",
"method_class": "java/lang/Object",
"method_name": "\u003cinit\u003e",
"method_type": "()V"
},
...
]
},
"access_flag": 33,
"this_class": 26,
"super_class": 30,
"interfaces": [],
"fields": [
{
"field_name": "greeting",
"field_type": "Ljava/lang/String;",
"access_flag": "26"
}
],
"methods": [
{
"method_name": "\u003cinit\u003e",
"method_type": "()V",
"method_flag": "1",
"method_opcode": "42,183,0,1,177"
},
...
],
"classfile_attributes": [
{
"attribute_name": "SourceFileAttribute",
"source_file": "Test.java"
},
...
]
}
Option.PRETTY_PRINTING and Option.MORE_READABLE
{
"magic": "cafebabe",
"version": "52.0",
"constants": {
"slotsNum": "37",
"slots": [
{
"index": 1,
"type": "parser.classfile.constantpool.ConstantMethodRefInfo",
"method_class": "java.lang.Object",
"method": " \u003cinit\u003e()"
},
...
]
},
"access_flag": "public super ",
"this_class": "Test",
"super_class": "java.lang.Object",
"interfaces": [],
"fields": [
{
"field": "private static final java.lang.String greeting"
}
],
"methods": [
{
"method_signature": "public \u003cinit\u003e()",
"method_opcode": "aload_0,invokespecial,nop,aconst_null,return"
},
...
],
"classfile_attributes": [
{
"attribute_name": "SourceFileAttribute",
"source_file": "Test.java"
},
...
]
}
Documentation
See its javadoc for full details.
License
Yes, I love the MIT LICENSE