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Opcode (in hex) Opcode (in binary) Other bytes [count]: [operand labels] Stack [before]→[after] Description aaload 32 0011 0010 arrayref, index → value load onto the stack a reference from an array aastore 53 0101 0011 arrayref, index, value → store a reference in an array aconst_null 01 0000 0001 → null push a null reference onto the stack
Convert to an int16 (on the stack as int32) and throw an exception on overflow. Base instruction 0x83 conv.ovf.i2.un: Convert unsigned to an int16 (on the stack as int32) and throw an exception on overflow. Base instruction 0xB7 conv.ovf.i4: Convert to an int32 (on the stack as int32) and throw an exception on overflow. Base instruction 0x84
Java bytecode is used at runtime either interpreted by a JVM or compiled to machine code via just-in-time (JIT) compilation and run as a native application. As Java bytecode is designed for a cross-platform compatibility and security, a Java bytecode application tends to run consistently across various hardware and software configurations. [3]
Bytecode (also called portable code or p-code) is a form of instruction set designed for efficient execution by a software interpreter.Unlike human-readable [1] source code, bytecodes are compact numeric codes, constants, and references (normally numeric addresses) that encode the result of compiler parsing and performing semantic analysis of things like type, scope, and nesting depths of ...
For example, the x86 architecture has available the 0x90 opcode; it is represented as NOP in the assembly source code. While it is possible to write programs directly in machine code, managing individual bits and calculating numerical addresses is tedious and error-prone.
During compilation of CLI programming languages, the source code is translated into CIL code rather than into platform- or processor-specific object code.CIL is a CPU- and platform-independent instruction set that can be executed in any environment supporting the Common Language Infrastructure, such as the .NET runtime on Windows, or the cross-platform Mono runtime.
Minimal instruction set computer (MISC) is a central processing unit (CPU) architecture, usually in the form of a microprocessor, with a very small number of basic operations and corresponding opcodes, together forming an instruction set. Such sets are commonly stack-based rather than register-based to reduce the size of operand specifiers.
For example, INT 13H will generate the 20th software interrupt (0x13 is nineteen (19) in hexadecimal notation, and the count starts at 0), causing the function pointed to by the 20th vector in the interrupt table to be executed. INT is widely used in real mode. In protected mode, INT is a privileged instruction. [1]