Implements optional parameter handling in MIPS vm.

runtime/vm/find_code_object_test.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 "platform/assert.h"
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/object.h"
 #include "vm/pages.h"
 #include "vm/stack_frame.h"
 #include "vm/symbols.h"
 #include "vm/unit_test.h"
 
 namespace dart {
 
-// Compiler only implemented on IA32, X64, and ARM.
-#if defined(TARGET_ARCH_IA32) ||                                               \
-    defined(TARGET_ARCH_X64) ||                                                \
-    defined(TARGET_ARCH_ARM)
-
 TEST_CASE(FindCodeObject) {
 #if defined(TARGET_ARCH_IA32)
   const int kLoopCount = 50000;
 #elif defined(TARGET_ARCH_X64)
   const int kLoopCount = 25000;
+#elif defined(TARGET_ARCH_MIPS)
+  const int kLoopCount = 1818;

[regis, 2013/04/03 21:12:39]

I would add a TODO(zra): Increase this count once we implement far branches on
MIPS.

[zra, 2013/04/03 21:41:00]

Done.

 #else
   const int kLoopCount = 20000;
 #endif
   const int kScriptSize = 512 * KB;
   const int kNumFunctions = 1024;
   char scriptChars[kScriptSize];
   String& url = String::Handle(String::New("dart-test:FindCodeObject"));
   String& source = String::Handle();
   Script& script = Script::Handle();
   Library& lib = Library::Handle();
@@ skipping 106 matching lines @@
   EXPECT(Code::LookupCode(pc) == code.raw());
 
   // Lookup the large function
   OS::SNPrint(buffer, 256, "moo%d", 0);
   function_name = String::New(buffer);
   function = clsB.LookupStaticFunction(function_name);
   EXPECT(!function.IsNull());
   code = function.CurrentCode();
   EXPECT(code.Size() > 16);
   pc = code.EntryPoint() + 16;
+#if defined(TARGET_ARCH_MIPS)
+  // MIPS can only Branch +/- 128KB
+  EXPECT(code.Size() > (PageSpace::kPageSize / 2));
+  EXPECT(Code::LookupCode(pc) == code.raw());
+  pc = code.EntryPoint() + (PageSpace::kPageSize / 4);
+  EXPECT(Code::LookupCode(pc) == code.raw());
+#else
   EXPECT(code.Size() > PageSpace::kPageSize);
   EXPECT(Code::LookupCode(pc) == code.raw());
   EXPECT(code.Size() > (1 * MB));
   pc = code.EntryPoint() + (1 * MB);
   EXPECT(Code::LookupCode(pc) == code.raw());
+#endif  // defined(TARGET_ARCH_MIPS)
 }
 
-#endif  // TARGET_ARCH_IA32 || TARGET_ARCH_X64 || TARGET_ARCH_ARM
-
 }  // namespace dart