pub struct DebugId { /* private fields */ }
Expand description

Unique identifier for debug information files and their debug information.

This type is analogous to CodeId, except that it identifies a debug file instead of the actual library or executable. One some platforms, a DebugId is an alias for a CodeId but the exact rules around this are complex. On Windows, the identifiers are completely different and refer to separate files.

The string representation must be between 33 and 40 characters long and consist of:

  1. 36 character hyphenated hex representation of the UUID field
  2. 1-16 character lowercase hex representation of the u32 appendix

The debug identifier is compatible to Google Breakpad. Use DebugId::breakpad to get a breakpad string representation of this debug identifier.

There is one exception to this: for the old PDB 2.0 format the debug identifier consists of only a 32-bit integer + age resulting in a string representation of between 9 and 16 hex characters.

Example

use std::str::FromStr;
use debugid::DebugId;

let id = DebugId::from_str("dfb8e43a-f242-3d73-a453-aeb6a777ef75-a")?;
assert_eq!("dfb8e43a-f242-3d73-a453-aeb6a777ef75-a".to_string(), id.to_string());

In-memory representation

The in-memory representation takes up 32 bytes and can be directly written to storage and mapped back into an object reference.

use std::str::FromStr;
use debugid::DebugId;

let debug_id = DebugId::from_str("dfb8e43a-f242-3d73-a453-aeb6a777ef75-a").unwrap();

let slice = &[debug_id];
let ptr = slice.as_ptr() as *const u8;
let len = std::mem::size_of_val(slice);
let buf: &[u8] = unsafe { std::slice::from_raw_parts(ptr, len) };

let mut new_buf: Vec<u8> = Vec::new();
std::io::copy(&mut std::io::Cursor::new(buf), &mut new_buf).unwrap();

let ptr = new_buf.as_ptr() as *const DebugId;
let new_debug_id = unsafe { &*ptr };

assert_eq!(*new_debug_id, debug_id);

As long the bytes were written using the same major version of this crate you will be able to read it again like this.

Implementations§

Constructs an empty debug identifier, containing only zeros.

Constructs a DebugId from its uuid.

Constructs a DebugId from its uuid and appendix parts.

Constructs a DebugId from a Microsoft little-endian GUID and age.

Constructs a DebugId from a PDB 2.0 timestamp and age.

Parses a breakpad identifier from a string.

Returns the UUID part of the code module’s debug_identifier.

If this is a debug identifier for the PDB 2.0 format an invalid UUID is returned where only the first 4 bytes are filled in and the remainder of the bytes are 0. This means the UUID has variant uuid::Variant::NCS and an unknown version, Uuid::get_version will return None, which is not a valid UUID.

This may seem odd however does seem reasonable:

  • Every DebugId can be represented as Uuid and will still mostly look reasonable e.g. in comparisons etc.
  • The PDB 2.0 format is very old and very unlikely to appear practically.

Returns the appendix part of the code module’s debug identifier.

On Windows, this is an incrementing counter to identify the build. On all other platforms, this value will always be zero.

Returns whether this identifier is nil, i.e. it consists only of zeros.

Returns whether this identifier is from the PDB 2.0 format.

Returns a wrapper which when formatted via fmt::Display will format a a breakpad identifier.

Trait Implementations§

Returns a copy of the value. Read more
Performs copy-assignment from source. Read more
Formats the value using the given formatter. Read more
Returns the “default value” for a type. Read more
Deserialize this value from the given Serde deserializer. Read more
Formats the value using the given formatter. Read more
Converts to this type from the input type.
Converts to this type from the input type.
The associated error which can be returned from parsing.
Parses a string s to return a value of this type. Read more
Feeds this value into the given Hasher. Read more
Feeds a slice of this type into the given Hasher. Read more
This method returns an Ordering between self and other. Read more
Compares and returns the maximum of two values. Read more
Compares and returns the minimum of two values. Read more
Restrict a value to a certain interval. Read more
This method tests for self and other values to be equal, and is used by ==. Read more
This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason. Read more
This method returns an ordering between self and other values if one exists. Read more
This method tests less than (for self and other) and is used by the < operator. Read more
This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
This method tests greater than (for self and other) and is used by the > operator. Read more
This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more
Serialize this value into the given Serde serializer. Read more

Auto Trait Implementations§

Blanket Implementations§

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning. Read more
Uses borrowed data to replace owned data, usually by cloning. Read more
Converts the given value to a String. Read more
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.