Implement MethodMirror.location in the VM.

runtime/lib/mirrors.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "lib/invocation_mirror.h"
 #include "vm/bootstrap_natives.h"
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
 #include "vm/exceptions.h"
@@ skipping 2138 matching lines @@
        String::Handle(func.name()).Equals("<anonymous closure>"))) {  // Case 3.
     last_tok_len = 0;
   }
   const Instance& result = Instance::Handle(
       script.GetSnippet(from_line, from_col, to_line, to_col + last_tok_len));
   ASSERT(!result.IsNull());
   return result.raw();
 }
 
 
+static RawInstance* CreateSourceLocation(const String& uri,
+                                         intptr_t line,
+                                         intptr_t column) {
+  const Array& args = Array::Handle(Array::New(3));
+  args.SetAt(0, uri);
+  args.SetAt(1, Smi::Handle(Smi::New(line)));
+  args.SetAt(2, Smi::Handle(Smi::New(column)));
+  return CreateMirror(Symbols::_SourceLocation(), args);
+}
+
+
+DEFINE_NATIVE_ENTRY(MethodMirror_location, 1) {
+  GET_NON_NULL_NATIVE_ARGUMENT(MirrorReference, ref, arguments->NativeArgAt(0));
+  const Function& func = Function::Handle(ref.GetFunctionReferent());
+  if (func.IsImplicitConstructor() || func.IsSignatureFunction()) {
+    // These are synthetic methods; they have no source.
+    return Instance::null();
+  }
+  const Script& script = Script::Handle(func.script());
+  const String& uri = String::Handle(script.url());
+  intptr_t from_line = 0;
+  intptr_t from_col = 0;
+  if (script.HasSource()) {
+    script.GetTokenLocation(func.token_pos(), &from_line, &from_col);
+  } else {
+    // Avoid the slow path of printing the token stream when precise source
+    // information is not available.
+    script.GetTokenLocation(func.token_pos(), &from_line, NULL);
+  }
+  // We should always have at least the line number.
+  ASSERT(from_line != 0);
+  return CreateSourceLocation(uri, from_line, from_col);
+}
+
+
 DEFINE_NATIVE_ENTRY(TypedefMirror_referent, 1) {
   GET_NON_NULL_NATIVE_ARGUMENT(Type, type, arguments->NativeArgAt(0));
   const Class& cls = Class::Handle(type.type_class());
   const Function& sig_func = Function::Handle(cls.signature_function());
   const Class& sig_cls = Class::Handle(sig_func.signature_class());
 
   AbstractType& referent_type = AbstractType::Handle(sig_cls.DeclarationType());
   referent_type = InstantiateType(referent_type, type);
 
   return CreateFunctionTypeMirror(sig_cls, referent_type);
@@ skipping 26 matching lines @@
 }
 
 DEFINE_NATIVE_ENTRY(TypeMirror_moreSpecificTest, 2) {
   GET_NON_NULL_NATIVE_ARGUMENT(AbstractType, a, arguments->NativeArgAt(0));
   GET_NON_NULL_NATIVE_ARGUMENT(AbstractType, b, arguments->NativeArgAt(1));
   return Bool::Get(a.IsMoreSpecificThan(b, NULL)).raw();
 }
 
 
 }  // namespace dart