Revert revisions 7215 and 7212.

src/hydrogen.cc

Index: src/hydrogen.cc
===================================================================
--- src/hydrogen.cc	(revision 7218)
+++ src/hydrogen.cc	(working copy)
@@ -1961,10 +1961,7 @@
 // Implementation of utility classes to represent an expression's context in
 // the AST.
 AstContext::AstContext(HGraphBuilder* owner, Expression::Context kind)
-    : owner_(owner),
-      kind_(kind),
-      outer_(owner->ast_context()),
-      for_typeof_(false) {
+    : owner_(owner), kind_(kind), outer_(owner->ast_context()) {
   owner->set_ast_context(this);  // Push.
 #ifdef DEBUG
   original_length_ = owner->environment()->length();
@@ -2108,14 +2105,6 @@
 }
 
 
-void HGraphBuilder::VisitForTypeOf(Expression* expr) {
-  ValueContext for_value(this);
-  for_value.set_for_typeof(true);
-  Visit(expr);
-}
-
-
-
 void HGraphBuilder::VisitForControl(Expression* expr,
                                     HBasicBlock* true_block,
                                     HBasicBlock* false_block) {
@@ -2808,21 +2797,29 @@
 }
 
 
-HGraphBuilder::GlobalPropertyAccess HGraphBuilder::LookupGlobalProperty(
-    Variable* var, LookupResult* lookup, bool is_store) {
-  if (var->is_this() || !info()->has_global_object()) {
-    return kUseGeneric;
+void HGraphBuilder::LookupGlobalPropertyCell(Variable* var,
+                                             LookupResult* lookup,
+                                             bool is_store) {
+  if (var->is_this()) {
+    BAILOUT("global this reference");
   }
+  if (!info()->has_global_object()) {
+    BAILOUT("no global object to optimize VariableProxy");
+  }
   Handle<GlobalObject> global(info()->global_object());
   global->Lookup(*var->name(), lookup);
-  if (!lookup->IsProperty() ||
-      lookup->type() != NORMAL ||
-      (is_store && lookup->IsReadOnly()) ||
-      lookup->holder() != *global) {
-    return kUseGeneric;
+  if (!lookup->IsProperty()) {
+    BAILOUT("global variable cell not yet introduced");
   }
-
-  return kUseCell;
+  if (lookup->type() != NORMAL) {
+    BAILOUT("global variable has accessors");
+  }
+  if (is_store && lookup->IsReadOnly()) {
+    BAILOUT("read-only global variable");
+  }
+  if (lookup->holder() != *global) {
+    BAILOUT("global property on prototype of global object");
+  }
 }
 
 
@@ -2858,31 +2855,19 @@
     ast_context()->ReturnInstruction(instr, expr->id());
   } else if (variable->is_global()) {
     LookupResult lookup;
-    GlobalPropertyAccess type = LookupGlobalProperty(variable, &lookup, false);
+    LookupGlobalPropertyCell(variable, &lookup, false);
+    CHECK_BAILOUT;
 
-    if (type == kUseCell &&
-        info()->global_object()->IsAccessCheckNeeded()) {
-      type = kUseGeneric;
+    Handle<GlobalObject> global(info()->global_object());
+    // TODO(3039103): Handle global property load through an IC call when access
+    // checks are enabled.
+    if (global->IsAccessCheckNeeded()) {
+      BAILOUT("global object requires access check");
     }
-
-    if (type == kUseCell) {
-      Handle<GlobalObject> global(info()->global_object());
-      Handle<JSGlobalPropertyCell> cell(global->GetPropertyCell(&lookup));
-      bool check_hole = !lookup.IsDontDelete() || lookup.IsReadOnly();
-      HLoadGlobalCell* instr = new HLoadGlobalCell(cell, check_hole);
-      ast_context()->ReturnInstruction(instr, expr->id());
-    } else {
-      HContext* context = new HContext;
-      AddInstruction(context);
-      HGlobalObject* global_object = new HGlobalObject(context);
-      AddInstruction(global_object);
-      HLoadGlobalGeneric* instr =
-          new HLoadGlobalGeneric(context,
-                                 global_object,
-                                 variable->name(),
-                                 ast_context()->is_for_typeof());
-      ast_context()->ReturnInstruction(instr, expr->id());
-    }
+    Handle<JSGlobalPropertyCell> cell(global->GetPropertyCell(&lookup));
+    bool check_hole = !lookup.IsDontDelete() || lookup.IsReadOnly();
+    HLoadGlobal* instr = new HLoadGlobal(cell, check_hole);
+    ast_context()->ReturnInstruction(instr, expr->id());
   } else {
     BAILOUT("reference to a variable which requires dynamic lookup");
   }
@@ -3239,18 +3224,16 @@
                                                    int position,
                                                    int ast_id) {
   LookupResult lookup;
-  GlobalPropertyAccess type = LookupGlobalProperty(var, &lookup, true);
-  if (type == kUseCell) {
-    bool check_hole = !lookup.IsDontDelete() || lookup.IsReadOnly();
-    Handle<GlobalObject> global(info()->global_object());
-    Handle<JSGlobalPropertyCell> cell(global->GetPropertyCell(&lookup));
-    HInstruction* instr = new HStoreGlobal(value, cell, check_hole);
-    instr->set_position(position);
-    AddInstruction(instr);
-    if (instr->HasSideEffects()) AddSimulate(ast_id);
-  } else {
-    BAILOUT("global store only supported for cells");
-  }
+  LookupGlobalPropertyCell(var, &lookup, true);
+  CHECK_BAILOUT;
+
+  bool check_hole = !lookup.IsDontDelete() || lookup.IsReadOnly();
+  Handle<GlobalObject> global(info()->global_object());
+  Handle<JSGlobalPropertyCell> cell(global->GetPropertyCell(&lookup));
+  HInstruction* instr = new HStoreGlobal(value, cell, check_hole);
+  instr->set_position(position);
+  AddInstruction(instr);
+  if (instr->HasSideEffects()) AddSimulate(ast_id);
 }
 
 
@@ -4345,12 +4328,10 @@
       // If there is a global property cell for the name at compile time and
       // access check is not enabled we assume that the function will not change
       // and generate optimized code for calling the function.
-      LookupResult lookup;
-      GlobalPropertyAccess type = LookupGlobalProperty(var, &lookup, false);
-      if (type == kUseCell &&
+      if (info()->has_global_object() &&
           !info()->global_object()->IsAccessCheckNeeded()) {
         Handle<GlobalObject> global(info()->global_object());
-        known_global_function = expr->ComputeGlobalTarget(global, &lookup);
+        known_global_function = expr->ComputeGlobalTarget(global, var->name());
       }
       if (known_global_function) {
         // Push the global object instead of the global receiver because
@@ -4553,8 +4534,7 @@
     }
 
   } else if (op == Token::TYPEOF) {
-    VisitForTypeOf(expr->expression());
-    if (HasStackOverflow()) return;
+    VISIT_FOR_VALUE(expr->expression());
     HValue* value = Pop();
     ast_context()->ReturnInstruction(new HTypeof(value), expr->id());
 
@@ -4957,8 +4937,7 @@
   if ((expr->op() == Token::EQ || expr->op() == Token::EQ_STRICT) &&
       left_unary != NULL && left_unary->op() == Token::TYPEOF &&
       right_literal != NULL && right_literal->handle()->IsString()) {
-    VisitForTypeOf(left_unary->expression());
-    if (HasStackOverflow()) return;
+    VISIT_FOR_VALUE(left_unary->expression());
     HValue* left = Pop();
     HInstruction* instr = new HTypeofIs(left,
         Handle<String>::cast(right_literal->handle()));