Questions tagged [memory-management]

For questions related to managing memory in programming languages, whether manually or automatically.

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3 votes
6 answers
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Are there languages or compilers having optimizations to deallocate variables early?

In a scope that defines two variables a and b, the code firstly does things only on a. Then <...
user23013's user avatar
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6 votes
4 answers
491 views

If garbage collection always sacrifice performance in multi-threaded languages, then how do some languages approch this problem?

Mark-and-Sweep garbage collection need to work over the graph of all objects in the process, and would stall threads to make the operation safe with regard to threads. I can think of no way to work ...
DannyNiu's user avatar
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21 votes
2 answers
4k views

To box or not to box? (how to determine if a value can be more efficiently passed by value or by reference)

I want to remove explicit addressing from my type system. In low level languages like C or Rust, you always have a choice whether to store some data by value or by reference. There are some advantages ...
mousetail's user avatar
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11 votes
1 answer
260 views

What was the rationale for making realloc(ptr, 0) have UB in C23

This is the first breaking change that C made, which was making realloc(ptr, 0) have UB instead of being roughly equivalent to ...
user1345541's user avatar
2 votes
1 answer
236 views

Are there languages making addresses to have other significant meaning?

Some examples: To support checking whether an object is of a subclass of a specific class in constant time, in a language using single inheritance, the compiler could arrange the vtables of classes ...
user23013's user avatar
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16 votes
6 answers
3k views

Possible to mix garbage collection and manual memory management?

Do you think it is possible to have a language that uses garbage collection (GC) by default, but allows you take more control with manual memory management like C++ or Rust, in areas of the software ...
Rob N's user avatar
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3 votes
1 answer
337 views

X86-64 Assembly for Recursive Functions

A compiler I'm writing generates the following x86-64 assembly (AT&T syntax) for a recursive factorial function. I convert the assembly into an ELF executable using ...
Veera Sivarajan's user avatar
12 votes
2 answers
430 views

Why did Objective-C remove `NSZone`?

NSZone is a type representing a memory allocation. NSObject implements the allocWithZone: ...
Bbrk24's user avatar
  • 8,907
6 votes
3 answers
809 views

Why might a language avoid reallocation?

In Java, the size of arrays are immutable. However, to my understanding, they are still allocated on the heap, because Java allocates almost everything on the heap. Even then, Java arrays are still ...
CPlus's user avatar
  • 7,861
3 votes
1 answer
131 views

Memory layout from a native class

I think there are languages where most of the standard library is written in themselves, however with most things marked as native or ...
Hydroper's user avatar
  • 919
2 votes
4 answers
169 views

Approaches for implementing weak references

How can weak references (weakrefs) be implemented, and how do the different approaches compare? The most important considerations for implementing weakrefs are: Safety ─ a weakref shouldn't allow ...
kaya3's user avatar
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15 votes
2 answers
439 views

Could ownership be inferred?

Rust famously has the concept of ownership vs. borrowing as part of its type system. This allows some level of automatic memory management ─ that is, heap allocations are freed when their owner goes ...
kaya3's user avatar
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12 votes
3 answers
971 views

Is it possible to extend C to have the Rust concept of ownership for memory safety?

Rust has a number of memory safety features. Is it possible to extend or enhance C or C++ to also provide similar memory safety features instead of using workarounds such as the Valgrind tool suite?
James Risner's user avatar