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objdiff
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Fix diffing across mismatched .text sections

This commit is contained in:
Luke Street 2023-02-06 17:39:35 -05:00
parent cd46be7726
commit 636a8e00c5
1 changed files with 36 additions and 23 deletions
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53
src/diff.rs
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@ -362,20 +362,26 @@ fn compare_ins(
Ok(result)
}
fn find_symbol<'a>(symbols: &'a mut [ObjSymbol], name: &str) -> Option<&'a mut ObjSymbol> {
symbols.iter_mut().find(|s| s.name == name)
fn find_section_and_symbol(obj: &ObjInfo, name: &str) -> Option<(usize, usize)> {
for (section_idx, section) in obj.sections.iter().enumerate() {
let symbol_idx = match section.symbols.iter().position(|symbol| symbol.name == name) {
Some(symbol_idx) => symbol_idx,
None => continue,
};
return Some((section_idx, symbol_idx));
}
None
}
pub fn diff_objs(left: &mut ObjInfo, right: &mut ObjInfo, _diff_config: &DiffConfig) -> Result<()> {
for left_section in &mut left.sections {
let Some(right_section) = right.sections.iter_mut().find(|s| s.name == left_section.name) else {
continue;
};
if left_section.kind == ObjSectionKind::Code {
for left_symbol in &mut left_section.symbols {
if let Some(right_symbol) =
find_symbol(&mut right_section.symbols, &left_symbol.name)
if let Some((right_section_idx, right_symbol_idx)) =
find_section_and_symbol(right, &left_symbol.name)
{
let right_section = &mut right.sections[right_section_idx];
let right_symbol = &mut right_section.symbols[right_symbol_idx];
left_symbol.diff_symbol = Some(right_symbol.name.clone());
right_symbol.diff_symbol = Some(left_symbol.name.clone());
diff_code(
@ -399,31 +405,38 @@ pub fn diff_objs(left: &mut ObjInfo, right: &mut ObjInfo, _diff_config: &DiffCon
)?;
}
}
for right_symbol in &mut right_section.symbols {
if right_symbol.instructions.is_empty() {
no_diff_code(
left.architecture,
&right_section.data,
right_symbol,
&right_section.relocations,
&left.line_info,
)?;
}
}
} else if left_section.kind == ObjSectionKind::Data {
} else {
let Some(right_section) = right.sections.iter_mut().find(|s| s.name == left_section.name) else {
continue;
};
if left_section.kind == ObjSectionKind::Data {
diff_data(left_section, right_section);
// diff_data_symbols(left_section, right_section)?;
} else if left_section.kind == ObjSectionKind::Bss {
diff_bss_symbols(&mut left_section.symbols, &mut right_section.symbols)?;
}
}
}
for right_section in right.sections.iter_mut().filter(|s| s.kind == ObjSectionKind::Code) {
for right_symbol in &mut right_section.symbols {
if right_symbol.instructions.is_empty() {
no_diff_code(
right.architecture,
&right_section.data,
right_symbol,
&right_section.relocations,
&right.line_info,
)?;
}
}
}
diff_bss_symbols(&mut left.common, &mut right.common)?;
Ok(())
}
fn diff_bss_symbols(left_symbols: &mut [ObjSymbol], right_symbols: &mut [ObjSymbol]) -> Result<()> {
for left_symbol in left_symbols {
if let Some(right_symbol) = find_symbol(right_symbols, &left_symbol.name) {
if let Some(right_symbol) = right_symbols.iter_mut().find(|s| s.name == left_symbol.name) {
left_symbol.diff_symbol = Some(right_symbol.name.clone());
right_symbol.diff_symbol = Some(left_symbol.name.clone());
let percent = if left_symbol.size == right_symbol.size { 100.0 } else { 50.0 };