Change deprecated semantics of function template signatures.

src/x64/stub-cache-x64.cc

Index: src/x64/stub-cache-x64.cc
diff --git a/src/x64/stub-cache-x64.cc b/src/x64/stub-cache-x64.cc
index 26a97abd20e33cba1473371dbe8092d220a5e906..cf23c1e5aa74963142d80d5a30aaabf536238ee9 100644
--- a/src/x64/stub-cache-x64.cc
+++ b/src/x64/stub-cache-x64.cc
@@ -570,20 +570,9 @@ class CallInterceptorCompiler BASE_EMBEDDED {
     ASSERT(optimization.is_constant_call());
     ASSERT(!lookup->holder()->IsGlobalObject());
 
-    int depth1 = kInvalidProtoDepth;
-    int depth2 = kInvalidProtoDepth;
-    bool can_do_fast_api_call = false;
-    if (optimization.is_simple_api_call() &&
-        !lookup->holder()->IsGlobalObject()) {
-      depth1 = optimization.GetPrototypeDepthOfExpectedType(
-          object, interceptor_holder);
-      if (depth1 == kInvalidProtoDepth) {
-        depth2 = optimization.GetPrototypeDepthOfExpectedType(
-            interceptor_holder, Handle<JSObject>(lookup->holder()));
-      }
-      can_do_fast_api_call =
-          depth1 != kInvalidProtoDepth || depth2 != kInvalidProtoDepth;
-    }
+    bool can_do_fast_api_call = !lookup->holder()->IsGlobalObject() &&
+                                optimization.is_simple_api_call() &&
+                                optimization.IsCompatibleReceiver(object);
 
     Counters* counters = masm->isolate()->counters();
     __ IncrementCounter(counters->call_const_interceptor(), 1);
@@ -597,10 +586,11 @@ class CallInterceptorCompiler BASE_EMBEDDED {
     // haven't changed and thus we can invoke interceptor.
     Label miss_cleanup;
     Label* miss = can_do_fast_api_call ? &miss_cleanup : miss_label;
+    int depth = can_do_fast_api_call ? 0 : kInvalidProtoDepth;
     Register holder =
         stub_compiler_->CheckPrototypes(object, receiver, interceptor_holder,
                                         scratch1, scratch2, scratch3,
-                                        name, depth1, miss);
+                                        name, depth, miss);
 
     // Invoke an interceptor and if it provides a value,
     // branch to |regular_invoke|.
@@ -613,17 +603,12 @@ class CallInterceptorCompiler BASE_EMBEDDED {
 
     // Check that the maps from interceptor's holder to constant function's
     // holder haven't changed and thus we can use cached constant function.
+    // TODO(2268): Switch to return holder once embedders have adapted.
     if (*interceptor_holder != lookup->holder()) {
       stub_compiler_->CheckPrototypes(interceptor_holder, receiver,
                                       Handle<JSObject>(lookup->holder()),
                                       scratch1, scratch2, scratch3,
-                                      name, depth2, miss);
-    } else {
-      // CheckPrototypes has a side effect of fetching a 'holder'
-      // for API (object which is instanceof for the signature).  It's
-      // safe to omit it here, as if present, it should be fetched
-      // by the previous CheckPrototypes.
-      ASSERT(depth2 == kInvalidProtoDepth);
+                                      name, kInvalidProtoDepth, miss);
     }
 
     // Invoke function.
@@ -2132,9 +2117,7 @@ Handle<Code> CallStubCompiler::CompileFastApiCall(
   if (object->IsGlobalObject()) return Handle<Code>::null();
   if (!cell.is_null()) return Handle<Code>::null();
   if (!object->IsJSObject()) return Handle<Code>::null();
-  int depth = optimization.GetPrototypeDepthOfExpectedType(
-      Handle<JSObject>::cast(object), holder);
-  if (depth == kInvalidProtoDepth) return Handle<Code>::null();
+  if (!optimization.IsCompatibleReceiver(object)) return Handle<Code>::null();
 
   Label miss, miss_before_stack_reserved;
   GenerateNameCheck(name, &miss_before_stack_reserved);
@@ -2154,9 +2137,10 @@ Handle<Code> CallStubCompiler::CompileFastApiCall(
   // before calling any runtime function.
   __ subq(rsp, Immediate(kFastApiCallArguments * kPointerSize));
 
-  // Check that the maps haven't changed and find a Holder as a side effect.
+  // Check that the maps haven't changed and find holder as a side effect.
+  // TODO(2268): Switch to return holder once embedders have adapted.
   CheckPrototypes(Handle<JSObject>::cast(object), rdx, holder, rbx, rax, rdi,
-                  name, depth, &miss);
+                  name, 0, &miss);
 
   // Move the return address on top of the stack.
   __ movq(rax, Operand(rsp, 4 * kPointerSize));