From: verwaest <verwaest@chromium.org>
Date: Tue, 24 Mar 2015 12:05:45 +0000 (-0700)
Subject: If CallNew targets a constant global, set its state to monomorphic
X-Git-Tag: upstream/4.7.83~3641
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=c46a93722012d3eff2e35402f0abec76e33595f3;p=platform%2Fupstream%2Fv8.git

If CallNew targets a constant global, set its state to monomorphic

BUG=

Review URL: https://codereview.chromium.org/1023103003

Cr-Commit-Position: refs/heads/master@{#27399}
---

diff --git a/src/ast.cc b/src/ast.cc
index 1ef5ab3aa..c907df19b 100644
--- a/src/ast.cc
+++ b/src/ast.cc
@@ -622,24 +622,6 @@ Call::CallType Call::GetCallType(Isolate* isolate) const {
 }
 
 
-bool Call::ComputeGlobalTarget(Handle<GlobalObject> global,
-                               LookupIterator* it) {
-  target_ = Handle<JSFunction>::null();
-  DCHECK(it->IsFound() && it->GetHolder<JSObject>().is_identical_to(global));
-  Handle<PropertyCell> cell = it->GetPropertyCell();
-  if (cell->value()->IsJSFunction()) {
-    Handle<JSFunction> candidate(JSFunction::cast(cell->value()));
-    // If the function is in new space we assume it's more likely to
-    // change and thus prefer the general IC code.
-    if (!it->isolate()->heap()->InNewSpace(*candidate)) {
-      target_ = candidate;
-      return true;
-    }
-  }
-  return false;
-}
-
-
 // ----------------------------------------------------------------------------
 // Implementation of AstVisitor
 
diff --git a/src/ast.h b/src/ast.h
index 661b5f962..60ba21d98 100644
--- a/src/ast.h
+++ b/src/ast.h
@@ -1849,11 +1849,14 @@ class Call FINAL : public Expression {
 
   Handle<AllocationSite> allocation_site() { return allocation_site_; }
 
+  void SetKnownGlobalTarget(Handle<JSFunction> target) {
+    target_ = target;
+    set_is_uninitialized(false);
+  }
   void set_target(Handle<JSFunction> target) { target_ = target; }
   void set_allocation_site(Handle<AllocationSite> site) {
     allocation_site_ = site;
   }
-  bool ComputeGlobalTarget(Handle<GlobalObject> global, LookupIterator* it);
 
   static int num_ids() { return parent_num_ids() + 2; }
   BailoutId ReturnId() const { return BailoutId(local_id(0)); }
@@ -1954,6 +1957,10 @@ class CallNew FINAL : public Expression {
   }
   void set_is_monomorphic(bool monomorphic) { is_monomorphic_ = monomorphic; }
   void set_target(Handle<JSFunction> target) { target_ = target; }
+  void SetKnownGlobalTarget(Handle<JSFunction> target) {
+    target_ = target;
+    is_monomorphic_ = true;
+  }
 
  protected:
   CallNew(Zone* zone, Expression* expression, ZoneList<Expression*>* arguments,
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index d9e22c15a..530221668 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -9106,10 +9106,10 @@ bool HOptimizedGraphBuilder::TryHandleArrayCallNew(CallNew* expr,
     return false;
   }
 
-  BuildArrayCall(expr,
-                 expr->arguments()->length(),
-                 function,
-                 expr->allocation_site());
+  Handle<AllocationSite> site = expr->allocation_site();
+  if (site.is_null()) return false;
+
+  BuildArrayCall(expr, expr->arguments()->length(), function, site);
   return true;
 }
 
@@ -9231,58 +9231,21 @@ void HOptimizedGraphBuilder::VisitCall(Call* expr) {
     // evaluation of the arguments.
     CHECK_ALIVE(VisitForValue(expr->expression()));
     HValue* function = Top();
-    if (expr->global_call()) {
-      Variable* var = proxy->var();
-      bool known_global_function = false;
-      // If there is a global property cell for the name at compile time and
-      // access check is not enabled we assume that the function will not change
-      // and generate optimized code for calling the function.
-      Handle<GlobalObject> global(current_info()->global_object());
-      LookupIterator it(global, var->name(),
-                        LookupIterator::OWN_SKIP_INTERCEPTOR);
-      GlobalPropertyAccess type = LookupGlobalProperty(var, &it, LOAD);
-      if (type == kUseCell) {
-        known_global_function = expr->ComputeGlobalTarget(global, &it);
-      }
-      if (known_global_function) {
-        Add<HCheckValue>(function, expr->target());
-
-        // Placeholder for the receiver.
-        Push(graph()->GetConstantUndefined());
-        CHECK_ALIVE(VisitExpressions(expr->arguments()));
-
-        // Patch the global object on the stack by the expected receiver.
-        HValue* receiver = ImplicitReceiverFor(function, expr->target());
-        const int receiver_index = argument_count - 1;
-        environment()->SetExpressionStackAt(receiver_index, receiver);
-
-        if (TryInlineBuiltinFunctionCall(expr)) {
-          if (FLAG_trace_inlining) {
-            PrintF("Inlining builtin ");
-            expr->target()->ShortPrint();
-            PrintF("\n");
-          }
-          return;
-        }
-        if (TryInlineApiFunctionCall(expr, receiver)) return;
-        if (TryHandleArrayCall(expr, function)) return;
-        if (TryInlineCall(expr)) return;
+    if (function->IsConstant() &&
+        HConstant::cast(function)->handle(isolate())->IsJSFunction()) {
+      Handle<Object> constant = HConstant::cast(function)->handle(isolate());
+      Handle<JSFunction> target = Handle<JSFunction>::cast(constant);
+      expr->SetKnownGlobalTarget(target);
+    }
 
-        PushArgumentsFromEnvironment(argument_count);
-        call = BuildCallConstantFunction(expr->target(), argument_count);
-      } else {
-        Push(graph()->GetConstantUndefined());
-        CHECK_ALIVE(VisitExpressions(expr->arguments()));
-        PushArgumentsFromEnvironment(argument_count);
-        call = New<HCallFunction>(function, argument_count);
-      }
+    // Placeholder for the receiver.
+    Push(graph()->GetConstantUndefined());
+    CHECK_ALIVE(VisitExpressions(expr->arguments()));
 
-    } else if (expr->IsMonomorphic()) {
+    if (expr->IsMonomorphic()) {
       Add<HCheckValue>(function, expr->target());
 
-      Push(graph()->GetConstantUndefined());
-      CHECK_ALIVE(VisitExpressions(expr->arguments()));
-
+      // Patch the global object on the stack by the expected receiver.
       HValue* receiver = ImplicitReceiverFor(function, expr->target());
       const int receiver_index = argument_count - 1;
       environment()->SetExpressionStackAt(receiver_index, receiver);
@@ -9296,15 +9259,12 @@ void HOptimizedGraphBuilder::VisitCall(Call* expr) {
         return;
       }
       if (TryInlineApiFunctionCall(expr, receiver)) return;
-
+      if (TryHandleArrayCall(expr, function)) return;
       if (TryInlineCall(expr)) return;
 
-      call = PreProcessCall(New<HInvokeFunction>(
-          function, expr->target(), argument_count));
-
+      PushArgumentsFromEnvironment(argument_count);
+      call = BuildCallConstantFunction(expr->target(), argument_count);
     } else {
-      Push(graph()->GetConstantUndefined());
-      CHECK_ALIVE(VisitExpressions(expr->arguments()));
       PushArgumentsFromEnvironment(argument_count);
       HCallFunction* call_function =
           New<HCallFunction>(function, argument_count);
@@ -9443,6 +9403,12 @@ void HOptimizedGraphBuilder::VisitCallNew(CallNew* expr) {
   HValue* function = Top();
   CHECK_ALIVE(VisitExpressions(expr->arguments()));
 
+  if (function->IsConstant() &&
+      HConstant::cast(function)->handle(isolate())->IsJSFunction()) {
+    Handle<Object> constant = HConstant::cast(function)->handle(isolate());
+    expr->SetKnownGlobalTarget(Handle<JSFunction>::cast(constant));
+  }
+
   if (FLAG_inline_construct &&
       expr->IsMonomorphic() &&
       IsAllocationInlineable(expr->target())) {