[OSDI] Memory Layout

修OSDI時，老師復習一個程式中，不同類型資料的儲存與定位方式。

Content

Sections

1. Text Segment
• code (plain text), contains executable instructions
• place below the heap or stack in order to prevent heaps and stack overflows from overwriting it.
• sharable and readonly
• may be accessed by editor, compiler, shell, etc.
2. Initialized Data Segment
• global variables and static variables
• not read-only
• initialized read-only area (ex. s[] = "hello world")
• initialized read-write area (ex. const char *string = "hello world")
3. Uninitialzed Data Segment
• bss section: block started by symbol
• global variables and static variables that are initialized to zero or do not have explicit initialization in source code
• ex.
• static int i;
• [global] int j;
4. Stack
5. Heap
• dynamic memory allocation

Reference

• GeeksforGeeks: Memory Layout of C Programs