Block Started by Symbol - ορισμός. Τι είναι το Block Started by Symbol
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Τι (ποιος) είναι Block Started by Symbol - ορισμός

SECTION FOR STATICALLY-ALLOCATED VARIABLES
Block Started by Symbol; BSS Segment; BSS segment
  • This shows the typical layout of a simple computer's program memory with the text, various data, and stack and heap sections.

Block Started by Symbol         
<memory> (BSS) The uninitialised data segment produced by Unix linkers. Objects in the bss segment have only a name and a size but no value. Executable code is located in the code segment and initialised data in the data segment. (2004-02-24)
.bss         
In computer programming, the block starting symbol (abbreviated to .bss or bss) is the portion of an object file, executable, or assembly language code that contains statically allocated variables that are declared but have not been assigned a value yet.
BSS segment         

Βικιπαίδεια

.bss

In computer programming, the block starting symbol (abbreviated to .bss or bss) is the portion of an object file, executable, or assembly language code that contains statically allocated variables that are declared but have not been assigned a value yet. It is often referred to as the "bss section" or "bss segment".

Typically only the length of the bss section, but no data, is stored in the object file. The program loader allocates memory for the bss section when it loads the program. By placing variables with no value in the .bss section, instead of the .data or .rodata section which require initial value data, the size of the object file is reduced.

On some platforms, some or all of the bss section is initialized to zeroes. Unix-like systems and Windows initialize the bss section to zero, allowing C and C++ statically allocated variables initialized to values represented with all bits zero to be put in the bss segment. Operating systems may use a technique called zero-fill-on-demand to efficiently implement the bss segment. In embedded software, the bss segment is mapped into memory that is initialized to zero by the C run-time system before main() is entered. Some C run-time systems may allow part of the bss segment not to be initialized; C variables must explicitly be placed into that portion of the bss segment.

On some computer architectures, the application binary interface also supports an sbss segment for "small data". Typically, these data items can be accessed using shorter instructions that may only be able to access a certain range of addresses. Architectures supporting thread-local storage might use a tbss section for uninitialized, static data marked as thread-local.