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Qu'est-ce (qui) est P-code machine - définition
P-code machine
PROGRAMMING VIRTUAL MACHINE
Microsoft P-Code; P-Code machine; Pseudo-code machine; Portable code machine; Packed code (Microsoft P-Code); Pseudo code (Microsoft P-Code); UCSD p-code
In computer programming, a p-code machine (portable code machine) is a virtual machine designed to execute p-code (the assembly language or machine code of a hypothetical central processing unit (CPU)). This term is applied both generically to all such machines (such as the Java virtual machine (JVM) and MATLAB precompiled code), and to specific implementations, the most famous being the p-Machine of the Pascal-P system, particularly the UCSD Pascal implementation, among whose developers, the p in p-code was construed to mean pseudo more often than portable, thus pseudo-code meaning instructions for a pseudo-machine.
machine code
SET OF INSTRUCTIONS EXECUTED DIRECTLY BY A COMPUTER'S CENTRAL PROCESSING UNIT (CPU)
Native code; Machine instruction; Machine Code; Machine language; Machine Language; Native applications; Native execution; Machine instruction (computing); Program machine code; Machine instructions; CPU instruction; CPU instructions; Opcode-level programming; Opcode level; Overlapping instructions; Overlapping instruction; Overlapping machine instructions; Overlapping machine instruction; Overlapping opcodes; Overlapping opcode; Overlapping opcode sequences; Overlapping opcode sequence; Overlapping op-codes; Overlapping op-code; Overlapping op-code sequences; Overlapping op-code sequence; Superpositioned code; Code superposition; Instruction overlapping; Code overlapping; Instruction scission; Opcode overlapping; Jump into the middle of instruction; Instruction overlapping technique; Jump in the middle; Jump into the middle of an instruction; Jumping into the middle of an instruction; Jumping into the middle of instruction; Code overlap; Overlapping code; Overlapped instruction encoding; Overlapped instruction; Overlapped instructions; Semantic code overlapping; Semantic overlapping (computing); Physical overlapping (computing); Physical code overlapping; Overlapped code; Code interleaving; Code outlining; Overlapping instruction sequences; Overlapping instruction sequence; Code-overlapping technique
Machine code is a way of expressing instructions and information in the form of numbers which can be understood by a computer or microchip. (COMPUTING)
N-UNCOUNT
machine code
SET OF INSTRUCTIONS EXECUTED DIRECTLY BY A COMPUTER'S CENTRAL PROCESSING UNIT (CPU)
Native code; Machine instruction; Machine Code; Machine language; Machine Language; Native applications; Native execution; Machine instruction (computing); Program machine code; Machine instructions; CPU instruction; CPU instructions; Opcode-level programming; Opcode level; Overlapping instructions; Overlapping instruction; Overlapping machine instructions; Overlapping machine instruction; Overlapping opcodes; Overlapping opcode; Overlapping opcode sequences; Overlapping opcode sequence; Overlapping op-codes; Overlapping op-code; Overlapping op-code sequences; Overlapping op-code sequence; Superpositioned code; Code superposition; Instruction overlapping; Code overlapping; Instruction scission; Opcode overlapping; Jump into the middle of instruction; Instruction overlapping technique; Jump in the middle; Jump into the middle of an instruction; Jumping into the middle of an instruction; Jumping into the middle of instruction; Code overlap; Overlapping code; Overlapped instruction encoding; Overlapped instruction; Overlapped instructions; Semantic code overlapping; Semantic overlapping (computing); Physical overlapping (computing); Physical code overlapping; Overlapped code; Code interleaving; Code outlining; Overlapping instruction sequences; Overlapping instruction sequence; Code-overlapping technique
The representation of a computer program which is actually
read and interpreted by the computer. A program in machine
code consists of a sequence of machine instructions (possibly
interspersed with data). Instructions are binary strings
which may be either all the same size (e.g. one 32-bit word for
many modern RISC microprocessors) or of different sizes,
in which case the size of the instruction is determined from
the first word (e.g. Motorola 68000) or byte (e.g. Inmos
transputer). The collection of all possible instructions
for a particular computer is known as its "instruction set".
Execution of machine code may either be hard-wired into the
central processing unit or it may be controlled by
microcode. The basic execution cycle consists of fetching
the next instruction from main memory, decoding it
(determining which operation it specifies and the location of
any arguments) and executing it by opening various gates
(e.g. to allow data to flow from main memory into a CPU
register) and enabling functional units (e.g. signalling to
the ALU to perform an addition).
Humans almost never write programs directly in machine code.
Instead, they use a programming language which is translated
by the computer into machine code. The simplest kind of
programming language is assembly language which usually has
a one-to-one correspondence with the resulting machine code
instructions but allows the use of mnemonics (ASCII strings)
for the "op codes" (the part of the instruction which
encodes the basic type of operation to perform) and names for
locations in the program (branch labels) and for variables and
constants.
(1995-02-15)
