Struct GlobalStateInner

pub struct GlobalStateInner {
    int_to_ptr_map: Vec<(u64, AllocId)>,
    base_addr: FxHashMap<AllocId, u64>,
    prepared_alloc_bytes: FxHashMap<AllocId, MiriAllocBytes>,
    reuse: ReusePool,
    exposed: FxHashSet<AllocId>,
    next_base_addr: u64,
    provenance_mode: ProvenanceMode,
}

Fields

int_to_ptr_map: Vec<(u64, AllocId)>

This is used as a map between the address of each allocation and its AllocId. It is always sorted by address. We cannot use a HashMap since we can be given an address that is offset from the base address, and we need to find the AllocId it belongs to. This is not the full inverse of base_addr; dead allocations have been removed.

base_addr: FxHashMap<AllocId, u64>

The base address for each allocation. We cannot put that into AllocExtra because function pointers also have a base address, and they do not have an AllocExtra. This is the inverse of int_to_ptr_map.

prepared_alloc_bytes: FxHashMap<AllocId, MiriAllocBytes>

Temporarily store prepared memory space for global allocations the first time their memory address is required. This is used to ensure that the memory is allocated before Miri assigns it an internal address, which is important for matching the internal address to the machine address so FFI can read from pointers.

reuse: ReusePool

A pool of addresses we can reuse for future allocations.

exposed: FxHashSet<AllocId>

Whether an allocation has been exposed or not. This cannot be put into AllocExtra for the same reason as base_addr.

next_base_addr: u64

This is used as a memory address when a new pointer is casted to an integer. It is always larger than any address that was previously made part of a block.

provenance_mode: ProvenanceMode

The provenance to use for int2ptr casts

Implementations

impl GlobalStateInner

pub fn new(config: &MiriConfig, stack_addr: u64) -> Self

pub fn remove_unreachable_allocs(&mut self, allocs: &LiveAllocs<'_, '_>)

Trait Implementations

impl Debug for GlobalStateInner

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

Formats the value using the given formatter.

impl VisitProvenance for GlobalStateInner

fn visit_provenance(&self, _visit: &mut VisitWith<'_>)

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 176 bytes