[turbofan] Introduce an ExternalPointer type.

src/compiler/code-generator.cc

 // Copyright 2013 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/compiler/code-generator.h"
 
 #include "src/address-map.h"
 #include "src/base/adapters.h"
 #include "src/compilation-info.h"
 #include "src/compiler/code-generator-impl.h"
@@ skipping 841 matching lines @@
       case Constant::kInt32:
         if (type.representation() == MachineRepresentation::kTagged ||
             type.representation() == MachineRepresentation::kTaggedSigned) {
           // When pointers are 4 bytes, we can use int32 constants to represent
           // Smis.
           DCHECK_EQ(4, kPointerSize);
           constant_object =
               handle(reinterpret_cast<Smi*>(constant.ToInt32()), isolate());
           DCHECK(constant_object->IsSmi());
         } else {
+          // TODO(jarin,bmeurer): We currently pass in raw pointers to the
+          // JSFunction::entry here. We should really consider fixing this.
           DCHECK(type == MachineType::Int32() ||
                  type == MachineType::Uint32() ||
                  type.representation() == MachineRepresentation::kBit ||
+                 type.representation() == MachineRepresentation::kWord32 ||
                  type.representation() == MachineRepresentation::kNone);
           DCHECK(type.representation() != MachineRepresentation::kNone ||
                  constant.ToInt32() == FrameStateDescriptor::kImpossibleValue);
 
           constant_object =
               isolate()->factory()->NewNumberFromInt(constant.ToInt32());
         }
         break;
       case Constant::kInt64:
         // When pointers are 8 bytes, we can use int64 constants to represent
         // Smis.
-        DCHECK(type.representation() == MachineRepresentation::kTagged ||
+        // TODO(jarin,bmeurer): We currently pass in raw pointers to the
+        // JSFunction::entry here. We should really consider fixing this.
+        DCHECK(type.representation() == MachineRepresentation::kWord64 ||
+               type.representation() == MachineRepresentation::kTagged ||
                type.representation() == MachineRepresentation::kTaggedSigned);
         DCHECK_EQ(8, kPointerSize);
         constant_object =
             handle(reinterpret_cast<Smi*>(constant.ToInt64()), isolate());
         DCHECK(constant_object->IsSmi());
         break;
       case Constant::kFloat32:
         if (type.representation() == MachineRepresentation::kTaggedSigned) {
           DCHECK(IsSmiDouble(constant.ToFloat32()));
         } else {
@@ skipping 48 matching lines @@
     : frame_(gen->frame()), masm_(gen->masm()), next_(gen->ools_) {
   gen->ools_ = this;
 }
 
 
 OutOfLineCode::~OutOfLineCode() {}
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8