probe_rs

Enum UnwindRule

Source 
pub enum UnwindRule {
    Preserve,
    Clear,
    SpecialRule,
}
Expand description

The rule used to preserve the value of a register between function calls during unwinding, when DWARF unwind information is not available.

The rules for these are based on the ‘Procedure Calling Standard’ for each of the supported architectures:

Please note that the Procedure Calling Standard define register rules for the act of calling and/or returning from functions, while the timing of a stack unwinding is different (the callee has not yet completed / executed the epilogue), and the rules about preserving register values have to take this into account.

Variants§

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Preserve

Callee-saved, a.k.a non-volatile registers, or call-preserved. If there is DWARF unwind RegisterRule we will apply it during unwind, otherwise we assume it was untouched and preserve the current value.

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Clear

Caller-saved, a.k.a. volatile registers, or call-clobbered. If there is DWARF unwind RegisterRule we will apply it during unwind, otherwise we assume it was corrupted by the callee, and clear the value. Note: This is the default value, and is used for all situations where DWARF unwind information is not available, and the register is not explicitly marked in the definition.

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SpecialRule

Additional rules are required to determine the value of the register. These are typically found in either the DWARF unwind information, or requires additional platform specific registers to be read.

Trait Implementations§

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impl Clone for UnwindRule

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fn clone(&self) -> UnwindRule

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 UnwindRule

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

Formats the value using the given formatter. Read more
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impl Default for UnwindRule

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fn default() -> UnwindRule

Returns the “default value” for a type. Read more
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impl PartialEq for UnwindRule

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

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl Copy for UnwindRule

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impl Eq for UnwindRule

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impl StructuralPartialEq for UnwindRule

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Causes self to use its LowerExp implementation when Debug-formatted.
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Causes self to use its LowerHex implementation when Debug-formatted.
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