Struct debugid::DebugId

#[repr(C, packed)]
pub struct DebugId { /* private fields */ }

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

impl DebugId

pub fn nil() -> Self

Constructs an empty debug identifier, containing only zeros.

pub fn from_uuid(uuid: Uuid) -> Self

Constructs a DebugId from its uuid.

pub fn from_parts(uuid: Uuid, appendix: u32) -> Self

Constructs a DebugId from its uuid and appendix parts.

pub fn from_guid_age(guid: &[u8], age: u32) -> Result<Self, ParseDebugIdError>

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

pub fn from_pdb20(timestamp: u32, age: u32) -> Self

Constructs a DebugId from a PDB 2.0 timestamp and age.

pub fn from_breakpad(string: &str) -> Result<Self, ParseDebugIdError>

Parses a breakpad identifier from a string.

pub fn uuid(&self) -> Uuid

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.

pub fn appendix(&self) -> u32

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.

pub fn is_nil(&self) -> bool

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

pub fn is_pdb20(&self) -> bool

Returns whether this identifier is from the PDB 2.0 format.

pub fn breakpad(&self) -> BreakpadFormat<'_>

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

Trait Implementations

impl Clone for DebugId

fn clone(&self) -> DebugId

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for DebugId

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for DebugId

fn default() -> DebugId

Returns the “default value” for a type.

impl Display for DebugId

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl From<(Uuid, u32)> for DebugId

fn from(tuple: (Uuid, u32)) -> Self

Converts to this type from the input type.

impl From<Uuid> for DebugId

fn from(uuid: Uuid) -> Self

Converts to this type from the input type.

impl FromStr for DebugId

type Err = ParseDebugIdError

The associated error which can be returned from parsing.

fn from_str(string: &str) -> Result<Self, ParseDebugIdError>

Parses a string s to return a value of this type.

impl Hash for DebugId

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H) where
    H: Hasher, 

Feeds a slice of this type into the given Hasher.

impl Ord for DebugId

fn cmp(&self, other: &DebugId) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

Restrict a value to a certain interval.

impl PartialEq<DebugId> for DebugId

fn eq(&self, other: &DebugId) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &DebugId) -> bool

This method tests for !=.

impl PartialOrd<DebugId> for DebugId

fn partial_cmp(&self, other: &DebugId) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Copy for DebugId

impl Eq for DebugId

impl StructuralEq for DebugId

impl StructuralPartialEq for DebugId