[turbofan] Implement sharing of context-independent code.

test/cctest/test-compiler.cc

Index: test/cctest/test-compiler.cc
diff --git a/test/cctest/test-compiler.cc b/test/cctest/test-compiler.cc
index 493189cb543ec812905c779748e55470e8518851..3b25480a4aa784687daacb44cdc7ea90bbd74d0e 100644
--- a/test/cctest/test-compiler.cc
+++ b/test/cctest/test-compiler.cc
@@ -370,7 +370,7 @@ TEST(FeedbackVectorUnaffectedByScopeChanges) {
 
 // Test that optimized code for different closures is actually shared
 // immediately by the FastNewClosureStub when run in the same context.
-TEST(OptimizedCodeSharing) {
+TEST(OptimizedCodeSharing1) {
   FLAG_stress_compaction = false;
   FLAG_allow_natives_syntax = true;
   FLAG_cache_optimized_code = true;
@@ -380,15 +380,16 @@ TEST(OptimizedCodeSharing) {
     LocalContext env;
     env->Global()->Set(v8::String::NewFromUtf8(CcTest::isolate(), "x"),
                        v8::Integer::New(CcTest::isolate(), i));
-    CompileRun("function MakeClosure() {"
-               "  return function() { return x; };"
-               "}"
-               "var closure0 = MakeClosure();"
-               "%DebugPrint(closure0());"
-               "%OptimizeFunctionOnNextCall(closure0);"
-               "%DebugPrint(closure0());"
-               "var closure1 = MakeClosure();"
-               "var closure2 = MakeClosure();");
+    CompileRun(
+        "function MakeClosure() {"
+        "  return function() { return x; };"
+        "}"
+        "var closure0 = MakeClosure();"
+        "%DebugPrint(closure0());"
+        "%OptimizeFunctionOnNextCall(closure0);"
+        "%DebugPrint(closure0());"
+        "var closure1 = MakeClosure();"
+        "var closure2 = MakeClosure();");
     Handle<JSFunction> fun1 = v8::Utils::OpenHandle(
         *v8::Local<v8::Function>::Cast(env->Global()->Get(v8_str("closure1"))));
     Handle<JSFunction> fun2 = v8::Utils::OpenHandle(
@@ -400,6 +401,61 @@ TEST(OptimizedCodeSharing) {
 }
 
 
+// Test that optimized code for different closures is actually shared
+// immediately by the FastNewClosureStub when run different contexts.
+TEST(OptimizedCodeSharing2) {
+  if (FLAG_stress_compaction) return;
+  FLAG_allow_natives_syntax = true;
+  FLAG_cache_optimized_code = true;
+  FLAG_turbo_cache_shared_code = true;
+  const char* flag = "--turbo-filter=*";
+  FlagList::SetFlagsFromString(flag, StrLength(flag));
+  CcTest::InitializeVM();
+  v8::HandleScope scope(CcTest::isolate());
+  v8::Local<v8::Script> script = v8_compile(
+      "function MakeClosure() {"
+      "  return function() { return x; };"
+      "}");
+  Handle<Code> reference_code;
+  {
+    LocalContext env;
+    env->Global()->Set(v8::String::NewFromUtf8(CcTest::isolate(), "x"),
+                       v8::Integer::New(CcTest::isolate(), 23));
+    script->GetUnboundScript()->BindToCurrentContext()->Run();
+    CompileRun(
+        "var closure0 = MakeClosure();"
+        "%DebugPrint(closure0());"
+        "%OptimizeFunctionOnNextCall(closure0);"
+        "%DebugPrint(closure0());");
+    Handle<JSFunction> fun0 = v8::Utils::OpenHandle(
+        *v8::Local<v8::Function>::Cast(env->Global()->Get(v8_str("closure0"))));
+    CHECK(fun0->IsOptimized() || !CcTest::i_isolate()->use_crankshaft());
+    reference_code = handle(fun0->code());
+  }
+  for (int i = 0; i < 10; i++) {
+    LocalContext env;
+    env->Global()->Set(v8::String::NewFromUtf8(CcTest::isolate(), "x"),
+                       v8::Integer::New(CcTest::isolate(), i));
+    script->GetUnboundScript()->BindToCurrentContext()->Run();
+    CompileRun(
+        "var closure0 = MakeClosure();"
+        "%DebugPrint(closure0());"
+        "%OptimizeFunctionOnNextCall(closure0);"
+        "%DebugPrint(closure0());"
+        "var closure1 = MakeClosure();"
+        "var closure2 = MakeClosure();");
+    Handle<JSFunction> fun1 = v8::Utils::OpenHandle(
+        *v8::Local<v8::Function>::Cast(env->Global()->Get(v8_str("closure1"))));
+    Handle<JSFunction> fun2 = v8::Utils::OpenHandle(
+        *v8::Local<v8::Function>::Cast(env->Global()->Get(v8_str("closure2"))));
+    CHECK(fun1->IsOptimized() || !CcTest::i_isolate()->use_crankshaft());
+    CHECK(fun2->IsOptimized() || !CcTest::i_isolate()->use_crankshaft());
+    CHECK_EQ(*reference_code, fun1->code());
+    CHECK_EQ(*reference_code, fun2->code());
+  }
+}
+
+
 TEST(CompileFunctionInContext) {
   CcTest::InitializeVM();
   v8::HandleScope scope(CcTest::isolate());