bytecode in A Sentence

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    Bytecode is not machine specific(different operating systems).

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    2

    It optimizes Bytecode and removes unused instructions.

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    3

    At the Bytecode level, checks are made for obvious hacks,

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    4

    Android Bytecode used to be called"Dalvik executable code", and so"dex".

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    5

    It also optimizes the Bytecode and removes any unused code instructions.

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    6

    Historically, the Bytecode verifier inferred all the types using these dataflow rules.

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    7

    The thing is that Bytecode by itself contains no explicit type information.

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    8

    We can say that the Bytecode is a machine language for Java Virtual Machine(JVM).

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    9

    The name Bytecode stems from instruction sets that have one-byte opcodes followed by optional parameters.

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    10

    When a method is chosen for compilation, the JVM feeds its Bytecode to the Just-In-Time compiler(JIT).

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    11

    Eventually the term P-Code was replaced with Bytecode, since most of the pseudo-operations are a byte long.

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    12

    When the compiler generates machine code(or Bytecode), it uses those numeric offsets to access each method or field.

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    13

    Since the Bytecode format itself can't be changed, this type information is stored seperately in an attribute called StackMapTable.

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    14

    Because compiled Java code is merely Bytecode, the JVM is responsible for compiling that Bytecode to machine code before running it.

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    15

    If you're used to Java, there are a few minor differences to how method parameter types work at the Bytecode level.

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    16

    It is not necessary to compile the Bytecode for 10 times again and again as the same instruction is going to execute for 10 times.

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    17

    JVM: Converts Java code into Bytecode and provides the specifications which tells how should a Java code be compiled, loaded, verified, checked for errors and executed.

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    18

    Unfortunately, it is impossible to infer all the types in a single linear pass through the Bytecode because a backwards jump might invalidate already inferred types.

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    19

    To help the JIT compiler analyze the method, its Bytecode are first reformulated in an internal representation called trees, which resembles machine code more closely than Bytecode.

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    20

    Java code is compiled into Bytecode which is highly optimized by the Java compiler so that the Java virtual machine(JVM) can execute Java applications at full speed.

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    21

    Among other things, Bytecode verification makes sure that instructions are well formed, that all the jumps are to valid instructions within the method, and that all instructions operate on values of the correct type.

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    22

    To do this, they required all new classes starting in Java 7(with Java 6 in a transitional state) to carry metadata about their types, so that the Bytecode can be verified in a single pass.

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    23

    But executing Bytecode is slow so the JVM measures how often the Bytecode is run and when it detects a"hotspot" of code that's run very frequently it performs dynamic compilation from Bytecode to machinecode of the"hotspot" code(hotspot profiler).

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    24

    Using the java just in time compiler(really a second compiler) at the particular system platform complies the Bytecode into particular system code, once the code has been re-compiled by the jit complier, it will usually run more quickly in the computer.

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    25

    Version 2.0 of GWT offers a number of new features, including: In-Browser Development Mode(formerly known as Out Of Process Hosted Mode, OOPHM): prior to version 2.0, hosted mode used to embed a modified browser to allow running the Bytecode version of the application during development.

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    26

    If this count exceeds a predefined limit JIT compiles the code into machine language which can directly be executed by the processor(unlike the normal case in which javac compile the code into Bytecode and then java- the interpreter interprets this Bytecode line by line converts it into machine code and executes).

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    27

    If this count exceeds a predefined limit JIT compiles the code into machine language which can directly be executed by the processor(unlike the normal case in which javac compile the code into Bytecode and then java- the interpreter interprets this Bytecode line by line converts it into machine code and executes).

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