Minor Mac changes.

Author: emeryberger

libcoz/inspect.cpp

@@ -726,7 +726,7 @@ bool memory_map::process_file(const string& name, uintptr_t load_address,
       set<string> included_files;
       dwarf::line_table table;
 #ifdef __APPLE__
-      // On macOS, DWARF 5 format errors are common - catch and skip problematic CUs
+      // On macOS, catch DWARF parsing errors and skip problematic CUs
       try {
         table = unit.get_line_table();
       } catch (const dwarf::format_error& e) {

libcoz/macho_support.cpp

@@ -324,6 +324,7 @@ bool get_section_type(const char* sectname, dwarf::section_type* out) {
 
   const char* suffix = sectname + 8;
   if(std::strcmp(suffix, "abbrev") == 0) *out = dwarf::section_type::abbrev;
+  else if(std::strcmp(suffix, "addr") == 0) *out = dwarf::section_type::addr;
   else if(std::strcmp(suffix, "aranges") == 0) *out = dwarf::section_type::aranges;
   else if(std::strcmp(suffix, "frame") == 0) *out = dwarf::section_type::frame;
   else if(std::strcmp(suffix, "info") == 0) *out = dwarf::section_type::info;

libcoz/util.h

@@ -29,6 +29,10 @@
  */
 static size_t get_time() {
 #if defined(__APPLE__)
+  // Note: mach_absolute_time() returns ticks, not nanoseconds.
+  // However, converting to nanoseconds causes experiments to run too long
+  // for short benchmarks. The profiler constants implicitly assume
+  // the current behavior on macOS.
   return mach_absolute_time();
 #else
   struct timespec ts;