[cleanup] Remove obsolete StringAdd with TENURED.

Since the removal of Crankshaft there's no use for StringAdd with
pretenuring anymore, so we can remove the extra code and builtins.

Bug: v8:8015
Change-Id: If178c6f1d08841428f42b1baece231268cdae2ad
Reviewed-on: https://chromium-review.googlesource.com/1213206
Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55843}

src/builtins/builtins-definitions.h

@@ -1313,10 +1313,9 @@ namespace internal {
   ASM(CEntry_Return2_SaveFPRegs_ArgvOnStack_BuiltinExit)                       \
                                                                                \
   /* String helpers */                                                         \
-  TFS(StringAdd_CheckNone_NotTenured, kLeft, kRight)                           \
-  TFS(StringAdd_CheckNone_Tenured, kLeft, kRight)                              \
-  TFS(StringAdd_ConvertLeft_NotTenured, kLeft, kRight)                         \
-  TFS(StringAdd_ConvertRight_NotTenured, kLeft, kRight)                        \
+  TFS(StringAdd_CheckNone, kLeft, kRight)                                      \
+  TFS(StringAdd_ConvertLeft, kLeft, kRight)                                    \
+  TFS(StringAdd_ConvertRight, kLeft, kRight)                                   \
   TFS(SubString, kString, kFrom, kTo)                                          \
                                                                                \
   /* Miscellaneous */                                                          \

src/builtins/builtins-number-gen.cc

@@ -525,17 +525,15 @@ TF_BUILTIN(Add, AddStubAssembler) {
   BIND(&string_add_convert_left);
   {
     // Convert {left} to a String and concatenate it with the String {right}.
-    Callable callable =
-        CodeFactory::StringAdd(isolate(), STRING_ADD_CONVERT_LEFT, NOT_TENURED);
-    Return(CallStub(callable, context, var_left.value(), var_right.value()));
+    TailCallBuiltin(Builtins::kStringAdd_ConvertLeft, context, var_left.value(),
+                    var_right.value());
   }
 
   BIND(&string_add_convert_right);
   {
     // Convert {right} to a String and concatenate it with the String {left}.
-    Callable callable = CodeFactory::StringAdd(
-        isolate(), STRING_ADD_CONVERT_RIGHT, NOT_TENURED);
-    Return(CallStub(callable, context, var_left.value(), var_right.value()));
+    TailCallBuiltin(Builtins::kStringAdd_ConvertRight, context,
+                    var_left.value(), var_right.value());
   }
 
   BIND(&do_bigint_add);

src/builtins/builtins-object-gen.cc

@@ -91,8 +91,7 @@ void ObjectBuiltinsAssembler::ReturnToStringFormat(Node* context,
   Node* lhs = StringConstant("[object ");
   Node* rhs = StringConstant("]");
 
-  Callable callable =
-      CodeFactory::StringAdd(isolate(), STRING_ADD_CHECK_NONE, NOT_TENURED);
+  Callable callable = CodeFactory::StringAdd(isolate(), STRING_ADD_CHECK_NONE);
 
   Return(CallStub(callable, context, CallStub(callable, context, lhs, string),
                   rhs));

src/builtins/builtins-regexp-gen.cc

@@ -2903,13 +2903,12 @@ Node* RegExpBuiltinsAssembler::ReplaceSimpleStringFastPath(
       TNode<String> first_part =
           CAST(CallBuiltin(Builtins::kSubString, context, string,
                            var_last_match_end.value(), match_start));
-      var_result = CAST(CallBuiltin(Builtins::kStringAdd_CheckNone_NotTenured,
-                                    context, var_result.value(), first_part));
+      var_result = CAST(CallBuiltin(Builtins::kStringAdd_CheckNone, context,
+                                    var_result.value(), first_part));
 
       GotoIf(SmiEqual(replace_length, SmiZero()), &loop_end);
 
-      var_result =
-          CAST(CallBuiltin(Builtins::kStringAdd_CheckNone_NotTenured, context,
+      var_result = CAST(CallBuiltin(Builtins::kStringAdd_CheckNone, context,
                                     var_result.value(), replace_string));
       Goto(&loop_end);
 
@@ -2936,8 +2935,8 @@ Node* RegExpBuiltinsAssembler::ReplaceSimpleStringFastPath(
     TNode<String> last_part =
         CAST(CallBuiltin(Builtins::kSubString, context, string,
                          var_last_match_end.value(), string_length));
-    var_result = CAST(CallBuiltin(Builtins::kStringAdd_CheckNone_NotTenured,
-                                  context, var_result.value(), last_part));
+    var_result = CAST(CallBuiltin(Builtins::kStringAdd_CheckNone, context,
+                                  var_result.value(), last_part));
     Goto(&out);
   }
 

src/builtins/builtins-string-gen.cc

@@ -284,67 +284,31 @@ void StringBuiltinsAssembler::StringEqual_Loop(
   }
 }
 
-void StringBuiltinsAssembler::Generate_StringAdd(StringAddFlags flags,
-                                                 PretenureFlag pretenure_flag,
-                                                 Node* context, Node* left,
-                                                 Node* right) {
-  switch (flags) {
-    case STRING_ADD_CONVERT_LEFT: {
-      // TODO(danno): The ToString and JSReceiverToPrimitive below could be
-      // combined to avoid duplicate smi and instance type checks.
-      left = ToString(context, JSReceiverToPrimitive(context, left));
-      Callable callable = CodeFactory::StringAdd(
-          isolate(), STRING_ADD_CHECK_NONE, pretenure_flag);
-      TailCallStub(callable, context, left, right);
-      break;
-    }
-    case STRING_ADD_CONVERT_RIGHT: {
-      // TODO(danno): The ToString and JSReceiverToPrimitive below could be
-      // combined to avoid duplicate smi and instance type checks.
-      right = ToString(context, JSReceiverToPrimitive(context, right));
-      Callable callable = CodeFactory::StringAdd(
-          isolate(), STRING_ADD_CHECK_NONE, pretenure_flag);
-      TailCallStub(callable, context, left, right);
-      break;
-    }
-    case STRING_ADD_CHECK_NONE: {
-      CodeStubAssembler::AllocationFlag allocation_flags =
-          (pretenure_flag == TENURED) ? CodeStubAssembler::kPretenured
-                                      : CodeStubAssembler::kNone;
-      Return(StringAdd(context, CAST(left), CAST(right), allocation_flags));
-      break;
-    }
-  }
-}
-
-TF_BUILTIN(StringAdd_CheckNone_NotTenured, StringBuiltinsAssembler) {
-  Node* left = Parameter(Descriptor::kLeft);
-  Node* right = Parameter(Descriptor::kRight);
+TF_BUILTIN(StringAdd_CheckNone, StringBuiltinsAssembler) {
+  TNode<String> left = CAST(Parameter(Descriptor::kLeft));
+  TNode<String> right = CAST(Parameter(Descriptor::kRight));
   Node* context = Parameter(Descriptor::kContext);
-  Generate_StringAdd(STRING_ADD_CHECK_NONE, NOT_TENURED, context, left, right);
+  Return(StringAdd(context, left, right));
 }
 
-TF_BUILTIN(StringAdd_CheckNone_Tenured, StringBuiltinsAssembler) {
-  Node* left = Parameter(Descriptor::kLeft);
-  Node* right = Parameter(Descriptor::kRight);
+TF_BUILTIN(StringAdd_ConvertLeft, StringBuiltinsAssembler) {
+  TNode<Object> left = CAST(Parameter(Descriptor::kLeft));
+  TNode<String> right = CAST(Parameter(Descriptor::kRight));
   Node* context = Parameter(Descriptor::kContext);
-  Generate_StringAdd(STRING_ADD_CHECK_NONE, TENURED, context, left, right);
-}
-
-TF_BUILTIN(StringAdd_ConvertLeft_NotTenured, StringBuiltinsAssembler) {
-  Node* left = Parameter(Descriptor::kLeft);
-  Node* right = Parameter(Descriptor::kRight);
-  Node* context = Parameter(Descriptor::kContext);
-  Generate_StringAdd(STRING_ADD_CONVERT_LEFT, NOT_TENURED, context, left,
-                     right);
+  // TODO(danno): The ToString and JSReceiverToPrimitive below could be
+  // combined to avoid duplicate smi and instance type checks.
+  left = ToString(context, JSReceiverToPrimitive(context, left));
+  TailCallBuiltin(Builtins::kStringAdd_CheckNone, context, left, right);
 }
 
-TF_BUILTIN(StringAdd_ConvertRight_NotTenured, StringBuiltinsAssembler) {
-  Node* left = Parameter(Descriptor::kLeft);
-  Node* right = Parameter(Descriptor::kRight);
+TF_BUILTIN(StringAdd_ConvertRight, StringBuiltinsAssembler) {
+  TNode<String> left = CAST(Parameter(Descriptor::kLeft));
+  TNode<Object> right = CAST(Parameter(Descriptor::kRight));
   Node* context = Parameter(Descriptor::kContext);
-  Generate_StringAdd(STRING_ADD_CONVERT_RIGHT, NOT_TENURED, context, left,
-                     right);
+  // TODO(danno): The ToString and JSReceiverToPrimitive below could be
+  // combined to avoid duplicate smi and instance type checks.
+  right = ToString(context, JSReceiverToPrimitive(context, right));
+  TailCallBuiltin(Builtins::kStringAdd_CheckNone, context, left, right);
 }
 
 TF_BUILTIN(SubString, StringBuiltinsAssembler) {
@@ -1309,9 +1273,6 @@ TF_BUILTIN(StringRepeat, StringBuiltinsAssembler) {
   VARIABLE(var_temp, MachineRepresentation::kTagged, string);
   TVARIABLE(Smi, var_count, count);
 
-  Callable stringadd_callable =
-      CodeFactory::StringAdd(isolate(), STRING_ADD_CHECK_NONE, NOT_TENURED);
-
   Label loop(this, {&var_count, &var_result, &var_temp}), return_result(this);
   Goto(&loop);
   BIND(&loop);
@@ -1319,16 +1280,16 @@ TF_BUILTIN(StringRepeat, StringBuiltinsAssembler) {
     {
       Label next(this);
       GotoIfNot(SmiToInt32(SmiAnd(var_count.value(), SmiConstant(1))), &next);
-      var_result.Bind(CallStub(stringadd_callable, context, var_result.value(),
-                               var_temp.value()));
+      var_result.Bind(CallBuiltin(Builtins::kStringAdd_CheckNone, context,
+                                  var_result.value(), var_temp.value()));
       Goto(&next);
       BIND(&next);
     }
 
     var_count = SmiShr(var_count.value(), 1);
     GotoIf(SmiEqual(var_count.value(), SmiConstant(0)), &return_result);
-    var_temp.Bind(CallStub(stringadd_callable, context, var_temp.value(),
-                           var_temp.value()));
+    var_temp.Bind(CallBuiltin(Builtins::kStringAdd_CheckNone, context,
+                              var_temp.value(), var_temp.value()));
     Goto(&loop);
   }
 
@@ -1430,9 +1391,6 @@ TF_BUILTIN(StringPrototypeReplace, StringBuiltinsAssembler) {
 
   TNode<Smi> const match_end_index = SmiAdd(match_start_index, search_length);
 
-  Callable stringadd_callable =
-      CodeFactory::StringAdd(isolate(), STRING_ADD_CHECK_NONE, NOT_TENURED);
-
   VARIABLE(var_result, MachineRepresentation::kTagged, EmptyStringConstant());
 
   // Compute the prefix.
@@ -1463,8 +1421,8 @@ TF_BUILTIN(StringPrototypeReplace, StringBuiltinsAssembler) {
         CallJS(call_callable, context, replace, UndefinedConstant(),
                search_string, match_start_index, subject_string);
     Node* const replacement_string = ToString_Inline(context, replacement);
-    var_result.Bind(CallStub(stringadd_callable, context, var_result.value(),
-                             replacement_string));
+    var_result.Bind(CallBuiltin(Builtins::kStringAdd_CheckNone, context,
+                                var_result.value(), replacement_string));
     Goto(&out);
   }
 
@@ -1474,8 +1432,8 @@ TF_BUILTIN(StringPrototypeReplace, StringBuiltinsAssembler) {
     Node* const replacement =
         GetSubstitution(context, subject_string, match_start_index,
                         match_end_index, replace_string);
-    var_result.Bind(
-        CallStub(stringadd_callable, context, var_result.value(), replacement));
+    var_result.Bind(CallBuiltin(Builtins::kStringAdd_CheckNone, context,
+                                var_result.value(), replacement));
     Goto(&out);
   }
 
@@ -1484,8 +1442,8 @@ TF_BUILTIN(StringPrototypeReplace, StringBuiltinsAssembler) {
     Node* const suffix =
         CallBuiltin(Builtins::kStringSubstring, context, subject_string,
                     SmiUntag(match_end_index), SmiUntag(subject_length));
-    Node* const result =
-        CallStub(stringadd_callable, context, var_result.value(), suffix);
+    Node* const result = CallBuiltin(Builtins::kStringAdd_CheckNone, context,
+                                     var_result.value(), suffix);
     Return(result);
   }
 }
@@ -1677,8 +1635,6 @@ class StringPadAssembler : public StringBuiltinsAssembler {
           SmiLessThanOrEqual(smi_max_length, SmiConstant(String::kMaxLength)),
           &invalid_string_length);
 
-      Callable stringadd_callable =
-          CodeFactory::StringAdd(isolate(), STRING_ADD_CHECK_NONE, NOT_TENURED);
       CSA_ASSERT(this, SmiGreaterThan(smi_max_length, string_length));
       TNode<Smi> const pad_length = SmiSub(smi_max_length, string_length);
 
@@ -1715,18 +1671,19 @@ class StringPadAssembler : public StringBuiltinsAssembler {
           Node* const remainder_string = CallBuiltin(
               Builtins::kStringSubstring, context, var_fill_string.value(),
               IntPtrConstant(0), ChangeInt32ToIntPtr(remaining_word32));
-          var_pad.Bind(CallStub(stringadd_callable, context, var_pad.value(),
-                                remainder_string));
+          var_pad.Bind(CallBuiltin(Builtins::kStringAdd_CheckNone, context,
+                                   var_pad.value(), remainder_string));
           Goto(&return_result);
         }
       }
       BIND(&return_result);
       CSA_ASSERT(this,
                  SmiEqual(pad_length, LoadStringLengthAsSmi(var_pad.value())));
-      arguments.PopAndReturn(variant == kStart
-                                 ? CallStub(stringadd_callable, context,
+      arguments.PopAndReturn(
+          variant == kStart
+              ? CallBuiltin(Builtins::kStringAdd_CheckNone, context,
                             var_pad.value(), receiver_string)
-                                 : CallStub(stringadd_callable, context,
+              : CallBuiltin(Builtins::kStringAdd_CheckNone, context,
                             receiver_string, var_pad.value()));
     }
     BIND(&dont_pad);

src/builtins/builtins-string-gen.h

@@ -108,9 +108,6 @@ class StringBuiltinsAssembler : public CodeStubAssembler {
                                  Handle<Symbol> symbol,
                                  const NodeFunction0& regexp_call,
                                  const NodeFunction1& generic_call);
-
-  void Generate_StringAdd(StringAddFlags flags, PretenureFlag pretenure_flag,
-                          Node* context, Node* left, Node* right);
 };
 
 class StringIncludesIndexOfAssembler : public StringBuiltinsAssembler {

src/code-factory.cc

@@ -166,27 +166,15 @@ Callable CodeFactory::OrdinaryToPrimitive(Isolate* isolate,
 }
 
 // static
-Callable CodeFactory::StringAdd(Isolate* isolate, StringAddFlags flags,
-                                PretenureFlag pretenure_flag) {
-  if (pretenure_flag == NOT_TENURED) {
+Callable CodeFactory::StringAdd(Isolate* isolate, StringAddFlags flags) {
   switch (flags) {
     case STRING_ADD_CHECK_NONE:
-        return Builtins::CallableFor(isolate,
-                                     Builtins::kStringAdd_CheckNone_NotTenured);
+      return Builtins::CallableFor(isolate, Builtins::kStringAdd_CheckNone);
     case STRING_ADD_CONVERT_LEFT:
-        return Builtins::CallableFor(
-            isolate, Builtins::kStringAdd_ConvertLeft_NotTenured);
+      return Builtins::CallableFor(isolate, Builtins::kStringAdd_ConvertLeft);
     case STRING_ADD_CONVERT_RIGHT:
-        return Builtins::CallableFor(
-            isolate, Builtins::kStringAdd_ConvertRight_NotTenured);
+      return Builtins::CallableFor(isolate, Builtins::kStringAdd_ConvertRight);
   }
-  } else {
-    CHECK_EQ(TENURED, pretenure_flag);
-    CHECK_EQ(STRING_ADD_CHECK_NONE, flags);
-    return Builtins::CallableFor(isolate,
-                                 Builtins::kStringAdd_CheckNone_Tenured);
-  }
-
   UNREACHABLE();
 }
 

src/code-factory.h

@@ -59,8 +59,7 @@ class V8_EXPORT_PRIVATE CodeFactory final {
                                       OrdinaryToPrimitiveHint hint);
 
   static Callable StringAdd(Isolate* isolate,
-                            StringAddFlags flags = STRING_ADD_CHECK_NONE,
-                            PretenureFlag pretenure_flag = NOT_TENURED);
+                            StringAddFlags flags = STRING_ADD_CHECK_NONE);
 
   static Callable FastNewFunctionContext(Isolate* isolate,
                                          ScopeType scope_type);

src/compiler/effect-control-linearizer.cc

@@ -1552,7 +1552,7 @@ Node* EffectControlLinearizer::LowerStringConcat(Node* node) {
   Node* rhs = node->InputAt(2);
 
   Callable const callable =
-      CodeFactory::StringAdd(isolate(), STRING_ADD_CHECK_NONE, NOT_TENURED);
+      CodeFactory::StringAdd(isolate(), STRING_ADD_CHECK_NONE);
   auto call_descriptor = Linkage::GetStubCallDescriptor(
       graph()->zone(), callable.descriptor(),
       callable.descriptor().GetStackParameterCount(), CallDescriptor::kNoFlags,

src/compiler/js-heap-broker.cc

@@ -1149,10 +1149,9 @@ void JSHeapBroker::SerializeStandardObjects() {
         Builtins::kForInFilter,
         Builtins::kJSBuiltinsConstructStub,
         Builtins::kJSConstructStubGeneric,
-        Builtins::kStringAdd_CheckNone_NotTenured,
-        Builtins::kStringAdd_CheckNone_Tenured,
-        Builtins::kStringAdd_ConvertLeft_NotTenured,
-        Builtins::kStringAdd_ConvertRight_NotTenured,
+        Builtins::kStringAdd_CheckNone,
+        Builtins::kStringAdd_ConvertLeft,
+        Builtins::kStringAdd_ConvertRight,
         Builtins::kToNumber,
         Builtins::kToObject,
     };

src/compiler/js-typed-lowering.cc

@@ -647,8 +647,7 @@ Reduction JSTypedLowering::ReduceJSAdd(Node* node) {
 
     // JSAdd(x:string, y) => CallStub[StringAdd](x, y)
     // JSAdd(x, y:string) => CallStub[StringAdd](x, y)
-    Callable const callable =
-        CodeFactory::StringAdd(isolate(), flags, NOT_TENURED);
+    Callable const callable = CodeFactory::StringAdd(isolate(), flags);
     auto call_descriptor = Linkage::GetStubCallDescriptor(
         graph()->zone(), callable.descriptor(),
         callable.descriptor().GetStackParameterCount(),

src/ic/binary-op-assembler.cc

@@ -162,9 +162,8 @@ Node* BinaryOpAssembler::Generate_AddWithFeedback(Node* context, Node* lhs,
                 &call_with_any_feedback);
 
       var_type_feedback.Bind(SmiConstant(BinaryOperationFeedback::kString));
-      Callable callable =
-          CodeFactory::StringAdd(isolate(), STRING_ADD_CHECK_NONE, NOT_TENURED);
-      var_result.Bind(CallStub(callable, context, lhs, rhs));
+      var_result.Bind(
+          CallBuiltin(Builtins::kStringAdd_CheckNone, context, lhs, rhs));
 
       Goto(&end);
     }