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discard the top two values on the stack (or one value, if it is a double or long) putfield b5 1011 0101 2: indexbyte1, indexbyte2 objectref, value → set field to value in an object objectref, where the field is identified by a field reference index in constant pool (indexbyte1 << 8 | indexbyte2) putstatic b3 1011 0011 2: indexbyte1, indexbyte2
However, the compiler automatically transforms the code so that the list will "silently" receive objects, while the source code only mentions primitive values. For example, the programmer can now write list. add (3) and think as if the int 3 were added to the list; but, the compiler will have actually transformed the line into list. add (new ...
The dominance frontier of node A is the set of nodes B where A does not strictly dominate B, but does dominate some immediate predecessor of B. These are the points at which multiple control paths merge back together into a single path. For example, in the following code:
Java bytecode is the instruction set of the Java virtual machine (JVM), the language to which Java and other JVM-compatible source code is compiled. [1] Each instruction is represented by a single byte , hence the name bytecode , making it a compact form of data .
However, the above example unnecessarily allocates a temporary array for the result of sin(x). A more efficient implementation would allocate a single array for y, and compute y in a single loop. To optimize this, a C++ compiler would need to: Inline the sin and operator+ function calls. Fuse the loops into a single loop.
It was split into two parts: the front end parsed the source and generated O-code, an intermediate language. The back end took the O-code and translated it into the machine code for the target machine. Only 1 ⁄ 5 of the compiler's code needed to be rewritten to support a new machine, a task that usually took between 2 and 5 person-months.
For example, the Java language does not allow client code that accesses the private data of a class to compile. [12] In the C++ language, private methods are visible, but not accessible in the interface; however, they may be made invisible by explicitly declaring fully abstract classes that represent the interfaces of the class.
Specifically for Pascal, in the specification of parameters a prefix "Var" signifies that it must be received by reference, its absence signifies by value. In the first case the compiler must generate code that passes the address of the parameter, while in the second it must generate different code that passes a copy of the value, usually via a ...