bytecode

What is the meaning of “static synthetic”?

由 ぐ巨炮叔叔 提交于 2019-11-26 16:40:04
问题 I am looking at some disassembled code obtained from Java bytecode. I see some declaration as follows: .method static synthetic access$0()Lcom/package/Sample; I am not able to figure out what the synthetic or access$0 mean. Can someone please help me understand this part? 回答1: Synthetic field, (2) A compiler-created field that links a local inner class to a block's local variable or reference type parameter. See also The JavaTM Virtual Machine Specification (§4.7.6) or Synthetic Class in Java

How do I get the byte values of a string in PHP?

由 情到浓时终转凉″ 提交于 2019-11-26 16:13:46
问题 Say I have a string in php, that prints out to a text file like this: nÖ§9q1Fª£ How do I get the byte codes of this to my text file rather than the funky ascii characters? 回答1: Use the ord function http://ca.php.net/ord eg. <?php $var = "nÖ§9q1Fª£ˆæÓ§Œ_»—Ló]j"; for($i = 0; $i < strlen($var); $i++) { echo ord($var[$i])."<br/>"; } ?> 回答2: If You wish to get the string as an array of integer codes, there's a nice one-liner: unpack('C*', $string) Beware, the resulting array is indexed from 1, not

CPython is bytecode interpreter?

由 ⅰ亾dé卋堺 提交于 2019-11-26 16:09:50
问题 I don't really get the concept of "bytecode interpreter" in the context of CPython. Can someone shed some light over the whole picture? Does it mean that CPython will compile and execute pyc file (bytecode file?). Then what compile py file to pyc file? And how is Jython different from CPython (except they are implemented in different languages). I also read somewhere that Python is C++ interpretation. Is this correct? And what does that mean? I'm still very new to Python, so forgive me if I

Is it possible to view bytecode of Class file? [duplicate]

由 那年仲夏 提交于 2019-11-26 15:56:49
Possible Duplicate: Is there a java classfile / bytecode editor to edit instructions? Java source code is compiled into bytecode, which is actually in the class file. Is it possible to view bytecode of a compiled class? If it is possible, can it be edited? Is there an eclipse plugin for that available? Jesper Yes. You can use the javap command that's included with the JDK to see the byte code of a class. For example: javap -c com.mypackage.MyClass There are several libraries and tools that help you to work with Java bytecode, for example ASM and Jasmin . The JDK comes with javap which is a

In Java Lambda&#39;s why is getClass() called on a captured variable

由 瘦欲@ 提交于 2019-11-26 15:53:11
问题 If you look at the byte code for Consumer<String> println = System.out::println; the byte code generates by Java 8 update 121 is GETSTATIC java/lang/System.out : Ljava/io/PrintStream; DUP INVOKEVIRTUAL java/lang/Object.getClass ()Ljava/lang/Class; POP INVOKEDYNAMIC accept(Ljava/io/PrintStream;)Ljava/util/function/Consumer; [ // handle kind 0x6 : INVOKESTATIC java/lang/invoke/LambdaMetafactory.metafactory(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType

Is there a java classfile / bytecode editor to edit instructions? [closed]

由 孤街浪徒 提交于 2019-11-26 15:35:59
问题 Is there a utility (or eclipse plugin) for editing java class files ? I'd like to manipulate the bytecode of a java class file without recompiling it nor having a complete buildpath. E.g. to rename methods, add/delete instructions, change constants etc. The only utilities I found are: classeditor but it's very limited in functionality ( e.g. renaming of things and manipulating instructions isn't possible ). jbe doesn't save changes (maybe because class verifying fails - before I made any

java bytecode editor? [closed]

由 让人想犯罪 __ 提交于 2019-11-26 13:51:32
问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 7 years ago . What's a good free bytecode editor? I want an editor, something with a GUI... I tried jbe-0.1b with no luck (can't save the bytecode

Why the Global Interpreter Lock?

由 不打扰是莪最后的温柔 提交于 2019-11-26 12:48:23
What is exactly the function of Python's Global Interpreter Lock? Do other languages that are compiled to bytecode employ a similar mechanism? Brian In general, for any thread safety problem you will need to protect your internal data structures with locks. This can be done with various levels of granularity. You can use fine-grained locking, where every separate structure has its own lock. You can use coarse-grained locking where one lock protects everything (the GIL approach). There are various pros and cons of each method. Fine-grained locking allows greater parallelism - two threads can

What are advantages of bytecode over native code? [closed]

由 左心房为你撑大大i 提交于 2019-11-26 12:39:12
问题 It seems like anything you can do with bytecode you can do just as easily and much faster in native code. In theory, you could even retain platform and language independence by distributing programs and libraries in bytecode then compiling to native code at installation, rather than JITing it. So in general, when would you want to execute bytecode instead of native? 回答1: Hank Shiffman from SGI said (a long time ago, but it's till true): There are three advantages of Java using byte code

How to emit and execute Java bytecode at runtime?

由 a 夏天 提交于 2019-11-26 12:08:58
问题 I am writing an interpreter in Java for a domain-specific language with some scripting capabilities. I have already implemented a parser and now need to do a back end. To this end I am considering either to write my own interpreter (either working with abstract syntax trees or with some custom bytecodes) or target JVM (emit and execute Java bytecode at runtime). Could someone with more experience in this area say how feasible is the approach of targeting JVM and what libraries would you
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