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LiveVariableAnalysis

gcrecomp_core::recompiler::analysis::data_flow

Struct LiveVariableAnalysis 

Source 
pub struct LiveVariableAnalysis {
    pub live_at_entry: HashMap<u32, BitVec<u32>>,
    pub live_at_exit: HashMap<u32, BitVec<u32>>,
}
Expand description

Live variable analysis results.

§Memory Optimization

  • Live variable sets use BitVec<u32> instead of HashSet<u8>
    • Saves memory: 1 bit per register (32 bits = 4 bytes) vs 8 bytes per register + overhead
    • Faster membership tests: O(1) bit access with better cache locality
    • Efficient set operations: bitwise AND/OR for intersection/union

§Algorithm

Uses iterative data flow analysis:

  • Initialize all blocks with empty live sets
  • Iterate until fixed point:
    • Live at exit = union of live at entry of successors
    • Live at entry = (Live at exit - Killed) ∪ Generated

Fields§

§live_at_entry: HashMap<u32, BitVec<u32>>

Live variables at entry of each basic block Key: block ID (u32), Value: bit vector of live registers (1 bit per register)

§live_at_exit: HashMap<u32, BitVec<u32>>

Live variables at exit of each basic block Key: block ID (u32), Value: bit vector of live registers (1 bit per register)

Trait Implementations§

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impl Clone for LiveVariableAnalysis

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fn clone(&self) -> LiveVariableAnalysis

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for LiveVariableAnalysis

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

Formats the value using the given formatter. Read more

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Immutably borrows from an owned value. Read more
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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
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where Self: Binary,

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where Self: LowerExp,

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where Self: LowerHex,

Causes self to use its LowerHex implementation when Debug-formatted.
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where Self: Octal,

Causes self to use its Octal implementation when Debug-formatted.
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where Self: Pointer,

Causes self to use its Pointer implementation when Debug-formatted.
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where Self: UpperExp,

Causes self to use its UpperExp implementation when Debug-formatted.
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where Self: UpperHex,

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Calls U::from(self).

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Mutably borrows self and passes that borrow into the pipe function. Read more
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where Self: Borrow<B>, B: 'a + ?Sized, R: 'a,

Borrows self, then passes self.borrow() into the pipe function. Read more
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where Self: AsMut<U>, U: 'a + ?Sized, R: 'a,

Mutably borrows self, then passes self.as_mut() into the pipe function.
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where Self: Deref<Target = T>, T: 'a + ?Sized, R: 'a,

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where Self: DerefMut<Target = T> + Deref, T: 'a + ?Sized, R: 'a,

Mutably borrows self, then passes self.deref_mut() into the pipe function.
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impl<T> Tap for T

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fn tap(self, func: impl FnOnce(&Self)) -> Self

Immutable access to a value. Read more
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fn tap_mut(self, func: impl FnOnce(&mut Self)) -> Self

Mutable access to a value. Read more
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fn tap_borrow<B>(self, func: impl FnOnce(&B)) -> Self
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