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Struct pack padding

Struct pack padding


Figure 1: The effect of pack size on layout

If you don't know why that's the case, let's take a very simple look at the forgotten art of 'Struct Packing':

In the build output, notice that padding shows up as (size=N) where N is the number of bytes used for padding.

The easiest way to pack a struct is to order them from largest to smallest, as a struct is always aligned to their largest data type.

For example, on m68K processor, a multiplexer sits in between an internal register and the external bus. The multiplexer selects the specified byte and ...

Data Arrangment; 17. Structure Padding ...

So, the integer variable c can not be allocated memory as shown above. An integer variable requires 4 bytes. The correct way of allocation of memory is ...

In my view, for example in a 32 bit controller following structure will be padded like this struct

E.g. this structs largest member is a pointer (8 bytes on 64 bit architecture). So it aligns to 8 bytes.

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These extra unused bytes are called padding bytes and this technique is called ...

Data structure padding

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The Lost Art of C Structure Packing

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Date/Time Bit Fields #pragma pack(push,1) // BYTE



Consider the following structure s2

Problem with structure alignment; missing padding with structs inside structs?-debugger-jpg

If you request no padding using __attribute__((packed)); the structure size is as you expect :-

Structure packing and padding in C language

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Memory representation of struct my_struct members

#include struct X {

and the start address of FormPar1[1] is on a 16 bit boundary in this case, rather than a 32 bit boundary.

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This is called structure packing. Now, if the CPU wants variable v or up it needs two word accesses for each word consisting of 4 bytes.


Memory representation of struct test __attribute__((aligned(8)))

Alignment requirements are rare on 8- and 16-bit CPUs, but quite common on 32-bit CPUs. Some CPUs (like the Motorola ColdFire and NEC V850) will generate ...

The Lost Art of C Structure Packing | Pointer (Computer Programming) | Integer (Computer Science)

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Structure Alignment and Packing in C Programming

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Structure padding. SORRY i have shown it wrong here is the right way struct { char a; int b; short int c;

Figure 1: Two possible ways the structure could be in memory.

Now we may think that the processor will allocate memory to this structure as shown below:

It is good practice to explicitly mention the padding so that no places are left with junk values.

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Memory representation of struct test __attribute__((aligned(64)))

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Memory representation of struct test __attribute__((packed, aligned(64)))

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Structures Structures are sometimes padded, e.g.: struct record_a

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5.2.10 Struct type

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Figure 2

As always, the first line is optional. All it does is tell the OS that when this program is executed, it should be executed as a Python script.

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24 64-Bit Recommendations ...

Figure 7.15. Order Fields by Decreasing Size to Reduce Padding

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The engineer has packed the structure—that is, there are no padding bytes to align word and long variables—and since a char variable ...

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A is “whatever” and then B, C, D, and E get defaults. What's going on here is the raw value can be stored off in a separate table somewhere, the compiler ...

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ARM 2007 Pack it The armcc compiler does include a keyword __packed that removes all padding

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(Oops, I've forgotten to pad the rects!) This one looks sensible already.

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