generated from PlexSheep/baserepo
43 lines
1.5 KiB
Rust
43 lines
1.5 KiB
Rust
//* # See what's behind the datatypes of Rust
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//*
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//* This Crate shows off how datatypes of rust are stored in memory.
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// reexport macros
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pub use crate::investigate_memory_layout;
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/// ## Investigate the internal representation of variables
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///
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/// Takes 1. the Type and 2. a [`Vec`] of items (of that datatype).
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#[macro_export]
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macro_rules! investigate_memory_layout {
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($t:ty, $v:tt) => {
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println!("Type:\t{}", std::any::type_name::<$t>());
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println!("\talign:\t{:?} B", std::mem::align_of::<$t>());
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println!("\tID:\t{:?}\n", std::any::TypeId::of::<$t>());
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println!("\tItems:");
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unsafe {
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for (index, item) in $v.iter().enumerate() {
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let pointer = item as *const $t;
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let mut memory: [u8; std::mem::size_of::<$t>()] = std::mem::transmute(item.clone());
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memory.reverse();
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println!(
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"\
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\t{index:02x}\titem:\t\t{item:?}\n\
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\t\tpointer: \t{:X?}\n\
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\t\talign: \t{}\n\
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\t\tsize: \t{}\n\
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\t\tmemory: \t{:X?}\n\
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\t\tbin mem: \t{}\n\
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\t\tnote: \tmemory order reversed\n\
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",
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pointer,
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display::byte_bit_display(std::mem::align_of_val(item)),
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display::byte_bit_display(memory.len()),
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memory,
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display::bytes_to_bin(&memory)
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);
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}
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}
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};
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}
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