ES6 computed property names

src/ia32/full-codegen-ia32.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_IA32
 
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 1599 matching lines @@
   // If result_saved is true the result is on top of the stack.  If
   // result_saved is false the result is in eax.
   bool result_saved = false;
 
   // Mark all computed expressions that are bound to a key that
   // is shadowed by a later occurrence of the same key. For the
   // marked expressions, no store code is emitted.
   expr->CalculateEmitStore(zone());
 
   AccessorTable accessor_table(zone());
-  for (int i = 0; i < expr->properties()->length(); i++) {
-    ObjectLiteral::Property* property = expr->properties()->at(i);
+  int property_index = 0;
+  for (; property_index < expr->properties()->length(); property_index++) {
+    ObjectLiteral::Property* property = expr->properties()->at(property_index);
+    if (property->is_computed_name()) break;
     if (property->IsCompileTimeValue()) continue;
 
-    Literal* key = property->key();
+    Literal* key = property->key()->AsLiteral();
     Expression* value = property->value();
     if (!result_saved) {
       __ push(eax);  // Save result on the stack
       result_saved = true;
     }
     switch (property->kind()) {
       case ObjectLiteral::Property::CONSTANT:
         UNREACHABLE();
       case ObjectLiteral::Property::MATERIALIZED_LITERAL:
         DCHECK(!CompileTimeValue::IsCompileTimeValue(value));
@@ skipping 59 matching lines @@
     __ push(Operand(esp, 0));  // Duplicate receiver.
     VisitForStackValue(it->first);
     EmitAccessor(it->second->getter);
     EmitSetHomeObjectIfNeeded(it->second->getter, 2);
     EmitAccessor(it->second->setter);
     EmitSetHomeObjectIfNeeded(it->second->setter, 3);
     __ push(Immediate(Smi::FromInt(NONE)));
     __ CallRuntime(Runtime::kDefineAccessorPropertyUnchecked, 5);
   }
 
+  // Object literals have two parts. The "static" part on the left contains no
+  // computed property names, and so we can compute its map ahead of time; see
+  // runtime.cc::CreateObjectLiteralBoilerplate. The second "dynamic" part
+  // starts with the first computed property name, and continues with all
+  // properties to its right.  All the code from above initializes the static
+  // component of the object literal, and arranges for the map of the result to
+  // reflect the static order in which the keys appear. For the dynamic
+  // properties, we compile them into a series of "SetOwnProperty" runtime
+  // calls. This will preserve insertion order.
+  for (; property_index < expr->properties()->length(); property_index++) {
+    ObjectLiteral::Property* property = expr->properties()->at(property_index);
+
+    Expression* key = property->key();
+    Expression* value = property->value();
+    if (!result_saved) {
+      __ push(eax);  // Save result on the stack
+      result_saved = true;
+    }
+
+    switch (property->kind()) {
+      case ObjectLiteral::Property::CONSTANT:
+      case ObjectLiteral::Property::MATERIALIZED_LITERAL:
+      case ObjectLiteral::Property::COMPUTED:
+        __ push(Operand(esp, 0));  // Duplicate receiver.
+        VisitForStackValue(key);
+        // TODO(arv): ToName for computed properties.

[arv (Not doing code reviews), 2014/12/10 23:38:13]

todo is done ;-)

+        if (property->is_computed_name()) {
+          __ InvokeBuiltin(Builtins::TO_NAME, CALL_FUNCTION);

[Dmitry Lomov (no reviews), 2014/12/11 12:34:35]

You can probably just call runtime function here, and not invoke the JS buitin

[arv (Not doing code reviews), 2014/12/11 15:47:24]

It is not clear to me why that is preferred?

[Dmitry Lomov (no reviews), 2014/12/11 16:01:15]

Saves you adding a builtin just for this case

+          __ push(eax);
+        }
+        VisitForStackValue(value);
+        if (property->emit_store()) {
+          __ push(Immediate(Smi::FromInt(NONE)));
+          __ CallRuntime(Runtime::kDefineDataPropertyUnchecked, 4);
+        } else {
+          __ Drop(3);
+        }
+        break;
+      case ObjectLiteral::Property::PROTOTYPE:
+        DCHECK(!property->is_computed_name());
+        __ push(Operand(esp, 0));  // Duplicate receiver.
+        VisitForStackValue(value);
+        if (property->emit_store()) {
+          __ CallRuntime(Runtime::kInternalSetPrototype, 2);
+        } else {
+          __ Drop(2);
+        }
+        break;
+
+      case ObjectLiteral::Property::GETTER:
+        __ push(Operand(esp, 0));  // Duplicate receiver.
+        VisitForStackValue(key);
+        VisitForStackValue(value);
+        __ CallRuntime(Runtime::kDefineClassGetter, 3);

[arv (Not doing code reviews), 2014/12/10 23:38:13]

I'll rename these two and move them to runtime-object.cc

[arv (Not doing code reviews), 2014/12/11 23:10:33]

Done.

+        break;
+
+      case ObjectLiteral::Property::SETTER:
+        __ push(Operand(esp, 0));  // Duplicate receiver.
+        VisitForStackValue(key);
+        VisitForStackValue(value);
+        __ CallRuntime(Runtime::kDefineClassSetter, 3);
+        break;
+    }
+  }
+
   if (expr->has_function()) {
     DCHECK(result_saved);
     __ push(Operand(esp, 0));
     __ CallRuntime(Runtime::kToFastProperties, 1);
   }
 
   if (result_saved) {
     context()->PlugTOS();
   } else {
     context()->Plug(eax);
@@ skipping 673 matching lines @@
   __ push(eax);
 
   // No access check is needed here since the constructor is created by the
   // class literal.
   Register scratch = ebx;
   __ mov(scratch, FieldOperand(eax, JSFunction::kPrototypeOrInitialMapOffset));
   __ Push(scratch);
 
   for (int i = 0; i < lit->properties()->length(); i++) {
     ObjectLiteral::Property* property = lit->properties()->at(i);
-    Literal* key = property->key()->AsLiteral();
+    Expression* key = property->key();
     Expression* value = property->value();
     DCHECK(key != NULL);
 
     if (property->is_static()) {
       __ push(Operand(esp, kPointerSize));  // constructor
     } else {
       __ push(Operand(esp, 0));  // prototype
     }
     VisitForStackValue(key);
     VisitForStackValue(value);
@@ skipping 2768 matching lines @@
   DCHECK_EQ(isolate->builtins()->OsrAfterStackCheck()->entry(),
             Assembler::target_address_at(call_target_address,
                                          unoptimized_code));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32