UserspaceEmulator: Make symbolication work when .text isn't the first

... segment

This happens with binaries build with Clang or with a custom linker
script. If this is the case, offsets should be calculated not from the
base address of `.text`, but from the first section loaded for the
library.

This commit moves all UserspaceEmulator symbolication into a common
helper function and fixes a FIXME.

1 files changed, 9 insertions, 0 deletions

diff --git a/Userland/DevTools/UserspaceEmulator/MmapRegion.h b/Userland/DevTools/UserspaceEmulator/MmapRegion.h
index c535c80aea..b39eaeee1b 100644
--- a/Userland/DevTools/UserspaceEmulator/MmapRegion.h
+++ b/Userland/DevTools/UserspaceEmulator/MmapRegion.h
@@ -52,6 +52,15 @@ public:
     void set_malloc_metadata(Badge<MallocTracer>, NonnullOwnPtr<MallocRegionMetadata> metadata) { m_malloc_metadata = move(metadata); }
 
     const String& name() const { return m_name; }
+    String lib_name() const
+    {
+        if (m_name.contains("Loader.so"sv))
+            return "Loader.so";
+        auto const maybe_separator = m_name.find(':');
+        if (!maybe_separator.has_value())
+            return {};
+        return m_name.substring(0, *maybe_separator);
+    }
     void set_name(String name) { m_name = move(name); }
 
 private: