Uses module name when generating IR, for improved readability.

As I touched the module repr, I added some tests to it. Turned out that cpython normalizes the path of a module and uses the pyc file in the repr string. That part is ignored in this test.

src/codegen/irgen/hooks.cpp

@@ -52,7 +52,7 @@ const std::string SourceInfo::getName() {
         case AST_TYPE::FunctionDef:
             return ast_cast<AST_FunctionDef>(ast)->name;
         case AST_TYPE::Module:
-            return "module";
+            return this->parent_module->name();
         default:
             RELEASE_ASSERT(0, "%d", ast->type);
     }

src/runtime/types.cpp

@@ -52,6 +52,16 @@ BoxedModule::BoxedModule(const std::string &name, const std::string &fn) : HCBox
     this->giveAttr("__file__", boxString(fn));
 }
 
+std::string BoxedModule::name(){
+    Box* name = this->peekattr("__name__");
+    if (!name || name->cls != str_cls) {
+        return "?";
+    } else {
+        BoxedString *sname = static_cast<BoxedString*>(name);
+        return sname->s;
+    }
+}
+
 extern "C" Box* boxCLFunction(CLFunction *f) {
     return new BoxedFunction(f);
 }
@@ -317,20 +327,12 @@ Box* moduleRepr(BoxedModule* m) {
     assert(m->cls == module_cls);
 
     std::ostringstream os;
-    os << "<module '";
-
-    Box* name = m->peekattr("__name__");
-    if (!name || name->cls != str_cls) {
-        os << '?';
-    } else {
-        BoxedString *sname = static_cast<BoxedString*>(name);
-        os << sname->s;
-    }
+    os << "<module '" << m->name() << "' ";
 
     if (m->fn == "__builtin__") {
-        os << "' (built-in)>";
+        os << "(built-in)>";
     } else {
-        os << "' from '" << m->fn << "'>";
+        os << "from '" << m->fn << "'>";
     }
     return boxString(os.str());
 }

src/runtime/types.h

@@ -256,6 +256,7 @@ class BoxedModule : public HCBox {
         const std::string fn; // for traceback purposes; not the same as __file__
 
         BoxedModule(const std::string &name, const std::string &fn);
+        std::string name();
 };
 
 class BoxedSlice : public HCBox {

test/tests/modules.py

+import empty_module
+import math
+
+x = repr(empty_module)
+
+# cpython will simplify the path (remove . and ..), and use the pyc file in the repr string. Pyston still doesn't support that, so we are only checking the non-path part.
+
+print x[0:29]
+print x[-2:]
+
+print repr(math) # no path for built-ins, so we can just check as normal