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use crate::num_display::BinNum;
use std::fmt::Debug;
pub struct OpcodeBitfield(pub u32);
impl OpcodeBitfield {
pub fn new(value: u32) -> Self {
Self(value)
}
/// Whether this instruction is the start of a function.
pub fn is_function_start(&self) -> bool {
self.0 >> 31 == 1
}
/// Whether there is an lsda entry for this instruction.
pub fn has_lsda(&self) -> bool {
(self.0 >> 30) & 0b1 == 1
}
/// An index into the global personalities array
/// (TODO: ignore if has_lsda() == false?)
pub fn personality_index(&self) -> u8 {
((self.0 >> 28) & 0b11) as u8
}
/// The architecture-specific kind of opcode this is, specifying how to
/// interpret the remaining 24 bits of the opcode.
pub fn kind(&self) -> u8 {
((self.0 >> 24) & 0b1111) as u8
}
/// The architecture-specific remaining 24 bits.
pub fn specific_bits(&self) -> u32 {
self.0 & 0xffffff
}
}
impl From<u32> for OpcodeBitfield {
fn from(opcode: u32) -> OpcodeBitfield {
OpcodeBitfield::new(opcode)
}
}
impl Debug for OpcodeBitfield {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("Opcode")
.field("kind", &self.kind())
.field("is_function_start", &self.is_function_start())
.field("has_lsda", &self.has_lsda())
.field("personality_index", &self.personality_index())
.field("specific_bits", &BinNum(self.specific_bits()))
.finish()
}
}