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Improve logic for generating padding symbols

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This commit is contained in:
Luke Street 2025-01-27 17:10:05 -07:00
parent a22e878258
commit 6819a8bd5f
2 changed files with 22 additions and 7 deletions
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6
src/obj/splits.rs
View File

@ -5,7 +5,7 @@ use itertools::Itertools;
use crate::{
obj::{ObjInfo, ObjSection, SectionIndex},
util::{nested::NestedVec, split::default_section_align},
util::split::default_section_align,
};
/// Marks a split point within a section.
@ -107,7 +107,9 @@ impl ObjSplits {
}
pub fn push(&mut self, address: u32, split: ObjSplit) {
self.splits.nested_push(address, split);
let out = self.splits.entry(address).or_default();
out.push(split);
out.sort_by_key(|s| s.end);
}
pub fn remove(&mut self, address: u32) -> Option<Vec<ObjSplit>> { self.splits.remove(&address) }

23
src/util/split.rs
View File

@ -530,8 +530,9 @@ fn validate_splits(obj: &ObjInfo) -> Result<()> {
/// Add padding symbols to fill in gaps between splits and symbols.
fn add_padding_symbols(obj: &mut ObjInfo) -> Result<()> {
for (section_index, section, addr, _split) in obj.sections.all_splits() {
if section.name == ".ctors" || section.name == ".dtors" {
let mut splits = obj.sections.all_splits().peekable();
while let Some((section_index, section, addr, split)) = splits.next() {
if section.name == ".ctors" || section.name == ".dtors" || addr == split.end {
continue;
}
@ -545,19 +546,31 @@ fn add_padding_symbols(obj: &mut ObjInfo) -> Result<()> {
})?
.is_none()
{
let next_split_address = splits
.peek()
.map(|(_, _, addr, _)| *addr as u64)
.unwrap_or(section.address + section.size);
let next_symbol_address = obj
.symbols
.for_section_range(section_index, addr + 1..)
.for_section_range(section_index, addr + 1..next_split_address as u32)
.find(|&(_, s)| s.size_known && s.size > 0)
.map(|(_, s)| s.address)
.unwrap_or(section.address + section.size);
.unwrap_or(next_split_address);
if next_symbol_address <= addr as u64 {
continue;
}
let symbol_name = format!(
"pad_{:02}_{:08X}_{}",
section_index,
addr,
section.name.trim_start_matches('.')
);
log::debug!("Adding padding symbol {} at {:#010X}", symbol_name, addr);
log::debug!(
"Adding padding symbol {} at {:#010X}-{:#010X}",
symbol_name,
addr,
next_symbol_address
);
obj.symbols.add_direct(ObjSymbol {
name: symbol_name,
address: addr as u64,