1 files changed, 71 insertions, 30 deletions

diff --git a/src/repo.cpp b/src/repo.cpp
index 691051b..edd62d5 100644
--- a/src/repo.cpp
+++ b/src/repo.cpp
@@ -15,13 +15,71 @@ namespace pdb
 {
     namespace
     {
+        std::string pdb_already_loaded(Address online_base, const std::string& path)
+        {
+            std::ostringstream oss;
+            oss << "module with online base address " << format_address(online_base)
+                << " has already been loaded: " << path;
+            return oss.str();
+        }
+
+        std::string pdb_already_loaded(const std::string& path)
+        {
+            std::ostringstream oss;
+            oss << "module has already been loaded: " << path;
+            return oss.str();
+        }
+
+        std::string offline_base_already_used(Address base)
+        {
+            std::ostringstream oss;
+            oss << "module with offline base address " << format_address(base)
+                << " has already been loaded (shouldn't happen)";
+            return oss.str();
+        }
+
+        std::string module_not_found(Address base)
+        {
+            std::ostringstream oss;
+            oss << "module with base address " << format_address(base)
+                << " wasn't found";
+            return oss.str();
+        }
+
+        std::string guess_module_no_modules(Address pivot)
+        {
+            std::ostringstream oss;
+            oss << "couldn't select a module for address " << format_address(pivot)
+                << ": no modules have been loaded yet";
+            return oss.str();
+        }
+
+        std::string guess_module_address_too_low(Address pivot)
+        {
+            std::ostringstream oss;
+            oss << "couldn't select a module for address " << format_address(pivot)
+                << ": it's too low";
+            return oss.str();
+        }
+
+        template <typename Value>
+        const Module& lookup_module(
+            const std::map<Address, Value>& modules,
+            Address base)
+        {
+            const auto it = modules.find(base);
+            if (it == modules.cend())
+                throw std::runtime_error{module_not_found(base)};
+            return it->second;
+        }
+
         template <typename Value>
         const Module& guess_module(
             const std::map<Address, Value>& modules,
             Address pivot)
         {
             if (modules.empty())
-                throw std::range_error{"there're no modules to choose from"};
+                throw std::range_error{guess_module_no_modules(pivot)};
 
             auto it = modules.lower_bound(pivot);
 
@@ -34,36 +92,13 @@ namespace pdb
             if (it->first > pivot)
             {
                 if (it == modules.cbegin())
-                    throw std::range_error{"couldn't choose a module"};
+                    throw std::range_error{guess_module_address_too_low(pivot)};
                 --it;
                 return it->second;
             }
 
             return it->second;
         }
-
-        std::string pdb_already_loaded(Address online_base, const std::string& path)
-        {
-            std::ostringstream oss;
-            oss << "module with online base address " << format_address(online_base)
-                << " has already been loaded: " << path;
-            return oss.str();
-        }
-
-        std::string pdb_already_loaded(const std::string& path)
-        {
-            std::ostringstream oss;
-            oss << "module has already been loaded: " << path;
-            return oss.str();
-        }
-
-        std::string offline_base_already_used(Address base)
-        {
-            std::ostringstream oss;
-            oss << "module with offline base address " << format_address(base)
-                << " has already been loaded (shouldn't happen)";
-            return oss.str();
-        }
     }
 
     Address Repo::add_pdb(Address online_base, const std::string& path)
@@ -120,13 +155,19 @@ namespace pdb
         return symbol_from_buffer(dbghelp.resolve_symbol(name));
     }
 
+    const Module& Repo::module_with_online_base(Address base) const
+    {
+        return lookup_module(online_bases, base);
+    }
+
+    const Module& Repo::module_with_offline_base(Address base) const
+    {
+        return lookup_module(offline_bases, base);
+    }
+
     Symbol Repo::symbol_from_buffer(const SymbolInfo& raw) const
     {
-        const auto offline_base = raw.get_offline_base();
-        const auto it = offline_bases.find(offline_base);
-        if (it == offline_bases.cend())
-            throw std::runtime_error{"symbol's module hasn't been loaded (shouldn't happen)"};
-        return symbol_from_buffer(it->second, raw);
+        return symbol_from_buffer(module_with_offline_base(raw.get_offline_base()), raw);
     }
 
     Symbol Repo::symbol_from_buffer(const Module& module, const SymbolInfo& raw)