Fix PS2 MWCC line number parsing (#363)

objdiff-core/src/obj/read.rs

@@ -732,11 +732,11 @@ fn parse_line_info(
 
 /// Parse .line section from DWARF 1.1 format.
 fn parse_line_info_dwarf1(obj_file: &object::File, sections: &mut [Section]) -> Result<()> {
-    if let Some(section) = obj_file.section_by_name(".line") {
+    let mut text_sections = sections.iter_mut().filter(|s| s.kind == SectionKind::Code);
+    for section in obj_file.sections().filter(|s| s.name().is_ok_and(|n| n == ".line")) {
         let data = section.uncompressed_data()?;
         let mut reader: &[u8] = data.as_ref();
 
-        let mut text_sections = sections.iter_mut().filter(|s| s.kind == SectionKind::Code);
         while !reader.is_empty() {
             let mut section_data = reader;
             let size = read_u32(obj_file, &mut section_data)? as usize;

objdiff-core/tests/arch_mips.rs

@@ -80,3 +80,25 @@ fn ido_mdebug_line_numbers() {
     assert_eq!(text_section.line_info.get(&56), Some(&9));
     assert_eq!(text_section.line_info.len(), 66);
 }
+
+#[test]
+#[cfg(feature = "mips")]
+fn mwcc_dwarf1_line_numbers_multiple_functions() {
+    let diff_config = diff::DiffObjConfig::default();
+    let obj = obj::read::parse(
+        include_object!("data/mips/mwcc_lines_example.o"),
+        &diff_config,
+        diff::DiffSide::Base,
+    )
+    .unwrap();
+
+    for function_name in ["foo", "bar"] {
+        let symbol = obj.symbols.iter().find(|s| s.name == function_name).unwrap();
+        let section_idx = symbol.section.unwrap();
+        let section = &obj.sections[section_idx];
+        assert!(
+            section.line_info.values().any(|line| *line > 0),
+            "{function_name} should have valid line numbers"
+        );
+    }
+}