Insert explicit deoptimization for named loads that have "uninitialized" type feedback.

test/cctest/test-log-stack-tracer.cc

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 259 matching lines @@
 }
 
 
 // This test verifies that stack tracing works when called during
 // execution of a native function called from JS code. In this case,
 // StackTracer uses Isolate::c_entry_fp as a starting point for stack
 // walking.
 TEST(CFromJSStackTrace) {
   // BUG(1303) Inlining of JSFuncDoTrace() in JSTrace below breaks this test.
   i::FLAG_use_inlining = false;
-
+  // This test does not work with --always-opt because we don't replace the code
+  // in the JSFunction at deoptimization in that case.
+  i::FLAG_always_opt = false;
   TickSample sample;
   InitTraceEnv(&sample);
 
   InitializeVM();
   v8::HandleScope scope;
   // Create global function JSFuncDoTrace which calls
   // extension function trace() with the current frame pointer value.
   CreateTraceCallerFunction("JSFuncDoTrace", "trace");
   Local<Value> result = CompileRun(
       "function JSTrace() {"
       "         JSFuncDoTrace();"
       "};\n"
       "JSTrace();\n"
       "true;");
   CHECK(!result.IsEmpty());
   // When stack tracer is invoked, the stack should look as follows:
   // script [JS]
   //   JSTrace() [JS]
   //     JSFuncDoTrace() [JS] [captures EBP value and encodes it as Smi]
   //       trace(EBP) [native (extension)]
   //         DoTrace(EBP) [native]
   //           StackTracer::Trace
 
   CHECK(sample.has_external_callback);
   CHECK_EQ(FUNCTION_ADDR(TraceExtension::Trace), sample.external_callback);
 
   // Stack tracing will start from the first JS function, i.e. "JSFuncDoTrace"
   int base = 0;
   CHECK_GT(sample.frames_count, base + 1);
+
   CHECK(IsAddressWithinFuncCode("JSFuncDoTrace", sample.stack[base + 0]));
   CHECK(IsAddressWithinFuncCode("JSTrace", sample.stack[base + 1]));
 }
 
 
 // This test verifies that stack tracing works when called during
 // execution of JS code. However, as calling StackTracer requires
 // entering native code, we can only emulate pure JS by erasing
 // Isolate::c_entry_fp value. In this case, StackTracer uses passed frame
 // pointer value as a starting point for stack walking.
@@ skipping 82 matching lines @@
   InitializeVM();
   v8::HandleScope scope;
   CHECK_EQ(0, GetJsEntrySp());
   CompileRun("a = 1; b = a + 1;");
   CHECK_EQ(0, GetJsEntrySp());
   CompileRun("js_entry_sp();");
   CHECK_EQ(0, GetJsEntrySp());
   CompileRun("js_entry_sp_level2();");
   CHECK_EQ(0, GetJsEntrySp());
 }