Source code
Revision control
Copy as Markdown
Other Tools
use crate::num_display::HexNum;
use std::fmt::Debug;
/// Allows accessing the two packed values from a "compressed" function entry.
#[derive(Clone, Copy, PartialEq, Eq)]
pub struct CompressedFunctionEntry(pub u32);
/// Entries are a u32 that contains two packed values (from high to low):
/// * 8 bits: opcode index
/// * 24 bits: function address
impl CompressedFunctionEntry {
/// Wrap the u32.
pub fn new(value: u32) -> Self {
Self(value)
}
/// The opcode index.
/// * 0..global_opcodes_len => index into global palette
/// * global_opcodes_len..255 => index into local palette
/// (subtract global_opcodes_len to get the real local index)
pub fn opcode_index(&self) -> u8 {
(self.0 >> 24) as u8
}
/// The function address, relative to the page's first_address.
pub fn relative_address(&self) -> u32 {
self.0 & 0xffffff
}
}
impl From<u32> for CompressedFunctionEntry {
fn from(entry: u32) -> CompressedFunctionEntry {
CompressedFunctionEntry::new(entry)
}
}
impl Debug for CompressedFunctionEntry {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
f.debug_struct("CompressedFunctionEntry")
.field("opcode_index", &HexNum(self.opcode_index()))
.field("relative_address", &HexNum(self.relative_address()))
.finish()
}
}