[Isolates] Merge from bleeding_edge, revisions 5934-6100.

src/x64/full-codegen-x64.cc

Index: src/x64/full-codegen-x64.cc
===================================================================
--- src/x64/full-codegen-x64.cc	(revision 6904)
+++ src/x64/full-codegen-x64.cc	(working copy)
@@ -198,6 +198,11 @@
 }
 
 
+void FullCodeGenerator::ClearAccumulator() {
+  __ xor_(rax, rax);
+}
+
+
 void FullCodeGenerator::EmitStackCheck(IterationStatement* stmt) {
   Comment cmnt(masm_, "[ Stack check");
   NearLabel ok;
@@ -840,7 +845,9 @@
   __ bind(&update_each);
   __ movq(result_register(), rbx);
   // Perform the assignment as if via '='.
-  EmitAssignment(stmt->each());
+  { EffectContext context(this);
+    EmitAssignment(stmt->each(), stmt->AssignmentId());
+  }
 
   // Generate code for the body of the loop.
   Visit(stmt->body());
@@ -1422,6 +1429,7 @@
     case VARIABLE:
       EmitVariableAssignment(expr->target()->AsVariableProxy()->var(),
                              expr->op());
+      context()->Plug(rax);
       break;
     case NAMED_PROPERTY:
       EmitNamedPropertyAssignment(expr);
@@ -1532,7 +1540,7 @@
 }
 
 
-void FullCodeGenerator::EmitAssignment(Expression* expr) {
+void FullCodeGenerator::EmitAssignment(Expression* expr, int bailout_id) {
   // Invalid left-hand sides are rewritten to have a 'throw
   // ReferenceError' on the left-hand side.
   if (!expr->IsValidLeftHandSide()) {
@@ -1582,6 +1590,7 @@
       break;
     }
   }
+  context()->Plug(rax);
 }
 
 
@@ -1655,8 +1664,6 @@
     }
     __ bind(&done);
   }
-
-  context()->Plug(rax);
 }
 
 
@@ -1694,10 +1701,9 @@
     __ push(Operand(rsp, kPointerSize));  // Receiver is under value.
     __ CallRuntime(Runtime::kToFastProperties, 1);
     __ pop(rax);
-    context()->DropAndPlug(1, rax);
-  } else {
-    context()->Plug(rax);
+    __ Drop(1);
   }
+  context()->Plug(rax);
 }
 
 
@@ -3148,6 +3154,7 @@
         { EffectContext context(this);
           EmitVariableAssignment(expr->expression()->AsVariableProxy()->var(),
                                  Token::ASSIGN);
+          context.Plug(rax);
         }
         // For all contexts except kEffect: We have the result on
         // top of the stack.
@@ -3158,6 +3165,7 @@
         // Perform the assignment as if via '='.
         EmitVariableAssignment(expr->expression()->AsVariableProxy()->var(),
                                Token::ASSIGN);
+        context()->Plug(rax);
       }
       break;
     case NAMED_PROPERTY: {
@@ -3352,7 +3360,7 @@
 
     case Token::INSTANCEOF: {
       VisitForStackValue(expr->right());
-      InstanceofStub stub;
+      InstanceofStub stub(InstanceofStub::kNoFlags);
       __ CallStub(&stub);
       __ testq(rax, rax);
        // The stub returns 0 for true.