Enum gimli::read::RegisterRule

pub enum RegisterRule<R: Reader> {
    Undefined,
    SameValue,
    Offset(i64),
    ValOffset(i64),
    Register(Register),
    Expression(Expression<R>),
    ValExpression(Expression<R>),
    Architectural,
}

An entry in the abstract CFI table that describes how to find the value of a register.

“The register columns contain rules that describe whether a given register has been saved and the rule to find the value for the register in the previous frame.”

Variants

Undefined

A register that has this rule has no recoverable value in the previous frame. (By convention, it is not preserved by a callee.)

SameValue

This register has not been modified from the previous frame. (By convention, it is preserved by the callee, but the callee has not modified it.)

Offset(i64)

Tuple Fields

0: i64

“The previous value of this register is saved at the address CFA+N where CFA is the current CFA value and N is a signed offset.”

ValOffset(i64)

Tuple Fields

0: i64

“The previous value of this register is the value CFA+N where CFA is the current CFA value and N is a signed offset.”

Register(Register)

Tuple Fields

0: Register

“The previous value of this register is stored in another register numbered R.”

Expression(Expression<R>)

Tuple Fields

0: Expression<R>

“The previous value of this register is located at the address produced by executing the DWARF expression.”

ValExpression(Expression<R>)

Tuple Fields

0: Expression<R>

“The previous value of this register is the value produced by executing the DWARF expression.”

Architectural

“The rule is defined externally to this specification by the augmenter.”

Trait Implementations

impl<R: Clone + Reader> Clone for RegisterRule<R>

fn clone(&self) -> RegisterRule<R>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<R: Debug + Reader> Debug for RegisterRule<R>

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

Formats the value using the given formatter.

impl<R: PartialEq + Reader> PartialEq<RegisterRule<R>> for RegisterRule<R>

fn eq(&self, other: &RegisterRule<R>) -> bool

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

fn ne(&self, other: &RegisterRule<R>) -> bool

This method tests for !=.

impl<R: Eq + Reader> Eq for RegisterRule<R>

impl<R: Reader> StructuralEq for RegisterRule<R>

impl<R: Reader> StructuralPartialEq for RegisterRule<R>