In computing, position-independent code (PIC) or position-independent executable (PIE) is machine instruction code that executes properly regardless of where in memory it resides. PIC is commonly used for shared libraries, so that the same library code can be loaded in a location in each program address space where it won't overlap any other uses of memory (for example, other shared libraries).
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- In computing, position-independent code (PIC) or position-independent executable (PIE) is machine instruction code that executes properly regardless of where in memory it resides. PIC is commonly used for shared libraries, so that the same library code can be loaded in a location in each program address space where it won't overlap any other uses of memory (for example, other shared libraries). PIC was also used on older computer systems lacking an MMU, so that the operating system could keep applications away from each other even within the single address space of an MMU-less system. Position-independent code can be copied to any memory location without modification and executed, unlike relocatable code, which requires special processing by a link editor or program loader to make it suitable for execution at a given location. Code must generally be written or compiled in a special fashion in order to be position independent. Instructions that refer to specific memory addresses, such as absolute branches, must be replaced with equivalent program counter relative instructions. The extra indirection may cause PIC code to be less efficient, although modern processors are designed to make this more tolerable.
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- In computing, position-independent code (PIC) or position-independent executable (PIE) is machine instruction code that executes properly regardless of where in memory it resides. PIC is commonly used for shared libraries, so that the same library code can be loaded in a location in each program address space where it won't overlap any other uses of memory (for example, other shared libraries).
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- Position-independent code
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