This article is based on Zhou Zhiming's "in-depth understanding of Java virtual machines"The instructions for a Java virtual machine consist of a byte-length opcode that represents the meaning of a particular operation (Opcode) and 0 to several
The Java Virtual Machine directive consists of a byte length, an opcode (Opcode) that represents a particular meaning, and the following 0 to many operands representing this action parameter. Many of the instructions in the virtual machine do not
If for different situations, need to perform different established operations, if or according to the normal execution process, is unable to complete the task, this time, it is necessary to introduce the concept of process jump, using the process
This article is reprinted and pasted here to facilitate searching for some commands.
From: http://blog.csdn.net/canfengxiliu/article/details/20144119
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Disclaimer: This article is based on the notes written by .
Dalvik Command
Branching and looping1. If the judging conditionIs_bool (): Determines whether it is a Boolean typeIs_int (), Is_integer (), and Is_long (): Determines whether it is an integral type.Is_float (), is_double (), and Is_real (): Determines whether it
A Java VM instruction is composed of an Opcode with a byte length that represents a specific meaning and a zero number that represents the operands of this operation parameter. In a virtual machine, many commands do not contain operands, but only
PHP goto operator
Can be used to jump to another location in the program. The position can be marked with the target name plus a colon, and the jump instruction is the position marker that the target is connected to after Goto
Some restrictions
PHP goto operatorCan be used to jump to another location in the program. The position can be marked with the target name plus a colon, and the jump instruction is the position marker that the target is connected to after GotoSome restrictions on the
Function: the reuse of code can be Implemented. function only needs to be defined 1 times, then the code in the function can be arbitrarily called. -the Basic concept of an unknown source Learning and time learning, such as the wrong pen,
Chapter III The machine-level representation of the program a historical perspectiveIntel processor (X86)Second, the program code gcc -01 -o p p1.c p2.c① compile Option-01 means the compiler uses first-level optimizations② compile Option-02 means
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