[Interpreter] Add support for global declarations and load/store of global variables

test/unittests/compiler/interpreter-assembler-unittest.cc

 // Copyright 2015 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 "test/unittests/compiler/interpreter-assembler-unittest.h"
 
 #include "src/code-factory.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/node.h"
 #include "src/interface-descriptors.h"
@@ skipping 456 matching lines @@
                  IsIntPtrAdd(
                      IsIntPtrConstant(FixedArray::kHeaderSize - kHeapObjectTag),
                      IsWordShl(index, IsInt32Constant(kPointerSizeLog2)))));
   }
 }
 
 
 TARGET_TEST_F(InterpreterAssemblerTest, LoadContextSlot) {
   TRACED_FOREACH(interpreter::Bytecode, bytecode, kBytecodes) {
     InterpreterAssemblerForTest m(this, bytecode);
-    Node* load_from_current_context = m.LoadContextSlot(22);
-    Matcher<Node*> load_from_current_context_matcher = m.IsLoad(
-        kMachAnyTagged, IsParameter(Linkage::kInterpreterContextParameter),
-        IsIntPtrConstant(Context::SlotOffset(22)));
-    EXPECT_THAT(load_from_current_context, load_from_current_context_matcher);
+    Node* context = m.Int32Constant(1);
+    Node* slot_index = m.Int32Constant(22);
+    Node* load_context_slot = m.LoadContextSlot(context, slot_index);
 
-    // Let's imagine that the loaded context slot is another context.
-    Node* load_from_any_context =
-        m.LoadContextSlot(load_from_current_context, 23);
-    EXPECT_THAT(load_from_any_context,
-                m.IsLoad(kMachAnyTagged, load_from_current_context_matcher,
-                         IsIntPtrConstant(Context::SlotOffset(23))));
+    Matcher<Node*> offset =
+        IsIntPtrAdd(IsWordShl(slot_index, IsInt32Constant(kPointerSizeLog2)),
+                    IsInt32Constant(Context::kHeaderSize - kHeapObjectTag));
+    EXPECT_THAT(load_context_slot, m.IsLoad(kMachAnyTagged, context, offset));
   }
 }
 
 
 TARGET_TEST_F(InterpreterAssemblerTest, LoadObjectField) {
   TRACED_FOREACH(interpreter::Bytecode, bytecode, kBytecodes) {
     InterpreterAssemblerForTest m(this, bytecode);
     Node* object = m.IntPtrConstant(0xdeadbeef);
     int offset = 16;
     Node* load_field = m.LoadObjectField(object, offset);
@@ skipping 95 matching lines @@
         feedback_vector,
         m.IsLoad(kMachAnyTagged, load_shared_function_info_matcher,
                  IsIntPtrConstant(SharedFunctionInfo::kFeedbackVectorOffset -
                                   kHeapObjectTag)));
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8