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→ value load a long value from a local variable #index: lload_0 1e 0001 1110 → value load a long value from a local variable 0 lload_1 1f 0001 1111 → value load a long value from a local variable 1 lload_2 20 0010 0000 → value load a long value from a local variable 2 lload_3 21 0010 0001 → value load a long value from a local variable 3
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 ...
C and C++ perform such promotion for objects of Boolean, character, wide character, enumeration, and short integer types which are promoted to int, and for objects of type float, which are promoted to double. Unlike some other type conversions, promotions never lose precision or modify the value stored in the object. In Java:
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 .
Perhaps the most well-known example is C++, an object-oriented extension of the C programming language. Due to the design requirements to add the object-oriented paradigm on to an existing procedural language, message passing in C++ has some unique capabilities and terminologies. For example, in C++ a method is known as a member function.
An object file is assumed to begin at a specific location in memory, often zero. It contains information on instructions that reference memory, so that the linker can relocate the code when combining multiple object files into a single program. An assembler is used to convert assembly code into machine code (object code). A linker links several ...
It is most commonly associated with the act of compiling a higher-level programming language such as C or C++, or an intermediate representation such as Java bytecode or Common Intermediate Language (CIL) code, into native machine code so that the resulting binary file can execute natively, just like a standard native compiler.
The simplest example of type introspection in Java is the instanceof [1] operator. The instanceof operator determines whether a particular object belongs to a particular class (or a subclass of that class, or a class that implements that interface). For instance: